1. Which materials can this machine weld — stainless steel, carbon steel, galvanized sheet, aluminum, copper?

The standard configuration covers stainless steel, carbon steel, galvanized sheet, aluminum, and copper. Because these metals differ greatly in resistivity and thermal conductivity, each is welded with its own parameter set rather than one universal setting: galvanized sheet needs a sharper current ramp to break through the zinc layer, while copper and aluminum require higher current density and shorter welding time. Material compatibility also depends on the welding technology selected, since laser, medium-frequency inverter DC, and capacitor discharge welding each suit different materials. Send us your material combination and thickness and we will confirm feasibility before you commit.

2. Which material and thickness combination is most difficult to weld, and how do you handle it?

The most demanding combination is high-conductivity material such as copper or thick aluminum, welded to steel. The reason is physical: copper conducts heat away from the joint roughly ten times faster than steel, so the welding energy concentrates in the wrong place unless current and time are tightly controlled. We handle it with short, high-current pulses, electrode materials matched to the workpiece, and where necessary projection geometry that focuses the current. Sampling is the honest answer to feasibility: we weld your samples first and you judge the result before production starts.

3. What is the maximum sheet thickness this machine can spot weld?

Maximum thickness depends on the welding technology, not on one fixed number. In resistance spot welding, typical production range is around 0.5 to 3 mm per sheet for steel; medium-frequency inverter DC machines extend this to about 2.5 + 2.5 mm carbon steel and 2.0 + 2.0 mm aluminum. Laser spot welding covers roughly 0.2 to 3 mm on stainless and carbon steel, and 0.2 to 2 mm on galvanized sheet and aluminum at 1500 W, with higher laser power available for thicker material. Total stack thickness matters more than single-sheet thickness, so tell us your full stack-up.

4. Can it weld dissimilar materials, such as copper to steel or aluminum to steel?

Yes, dissimilar material joints are possible, but they are a process question rather than a simple yes. Steel to stainless steel and steel to galvanized steel are routine. Copper to steel and aluminum to steel are weldable with short high-current pulses or with laser welding, though the joint forms a metallurgical bond at the interface rather than a fully mixed nugget, so strength testing is required to set parameters. In some cases a projection or a transition insert improves the result. We recommend sampling with your actual materials before setting the production process.

5. What does “non-marking” welding actually mean, and under what conditions is it achieved?

Non-marking welding means welding from one side of the workpiece while the visible opposite surface stays essentially free of marks, discoloration, and deformation. It works because the heat is delivered in a very short, highly concentrated pulse with a small heat-affected zone, so heat does not build up on the reverse side. It is achieved under suitable conditions: the right material, thickness, joint design, and welding parameters. It is a controlled result rather than an automatic property of the machine, which is why parameters are confirmed on your samples first.

6. Will the welding mark be visible after painting or powder coating?

In most cases the welding mark is not visible after painting or powder coating. The short, concentrated welding pulse keeps surface discoloration and indentation minimal, so the coating covers the weld point evenly. Results depend on material and thickness: on 0.2 to 3 mm stainless and carbon steel the reverse surface stays nearly mark-free, while thicker material or high-conductivity metals may show a faint trace. Tell us your material, thickness, and coating process and we will confirm the expected surface result with a sample rather than a promise.

7. Is non-marking welding guaranteed on every material?

No, and we would rather say so clearly. Non-marking welding is achieved under suitable material, thickness, and parameter conditions; it is not unconditional. Thick stacks, high-conductivity materials such as copper, coated sheets, and parts with poor fit-up can all produce a visible mark even with optimized parameters. What we commit to is this: we evaluate your workpiece, weld samples, show you the actual result, and only then recommend a process. That is why sampling comes before purchase, not after.

8. How does laser spot welding compare with resistance spot welding in surface appearance?

Laser spot welding produces a smaller, cleaner weld with almost no surface discoloration and a much smaller heat-affected zone, so the reverse surface can stay nearly mark-free. Resistance spot welding leaves a characteristic indentation on both sides and often light surface marking, which sometimes needs grinding before painting. The practical difference is finishing cost: laser welding frequently removes the grinding and polishing step entirely for appearance-critical parts, while resistance welding remains the more economical choice where surface appearance does not matter.

9. How strong is a laser spot weld compared with a resistance spot weld?

Both processes produce strong joints, but they differ in how the strength is achieved. Resistance spot welding forms a large nugget by passing current through the stack with electrode force, giving high shear strength suited to structural sheet metal. Laser spot welding creates a deep, narrow weld with high energy density; with correct parameters the weld strength is fully adequate for enclosures, panels, brackets, and battery connections. For safety-critical structures, we recommend peel or tensile testing on your actual joint geometry to confirm the required strength rather than relying on general claims.

10. Can the weld strength be verified, and what test method do you recommend?

Yes, and we recommend testing rather than assuming. The standard workshop methods are the peel test, where the welded joint is pried apart to inspect nugget size and failure mode, and the tensile or shear test, which measures the load the joint carries. For appearance-critical or sealed parts, a cross-section can be polished and measured for nugget diameter and penetration depth. A simple periodic peel test during production is usually enough to detect parameter drift. Send us your part and we will suggest the test that fits your acceptance requirements.

11. What is the nugget diameter / weld size for a given material thickness?

Nugget diameter scales with material thickness rather than being a fixed value. A common engineering guide for resistance spot welding is a nugget diameter of about 4 to 5 times the square root of the thinner sheet thickness, which for a 1 mm sheet means roughly 4 to 5 mm. For laser spot welding, the weld area is smaller and strength comes from penetration depth instead. Because the right value depends on material, stack-up, and the strength your product requires, we define it during sampling and record it as the reference for your production acceptance check.

12. How do you keep weld quality consistent across a long production run?

Consistency comes from three things working together: a stable welding current, a precise welding time, and proper electrode force. Medium-frequency inverter DC systems hold the current stable despite mains fluctuation, which is the main reason weld quality drifts on power-frequency machines. Beyond the machine, consistency requires disciplined maintenance: electrode dressing or replacement on schedule, stable cooling water temperature, and periodic peel tests. We provide a parameter sheet and a maintenance checklist with each machine so the process stays reproducible shift to shift.

13. Will the workpiece deform or discolor during welding?

Deformation depends on how much heat enters the part, not on the machine size. Both laser spot welding and capacitor discharge welding deliver the energy in a few milliseconds, which keeps the heat-affected zone small and limits distortion and discoloration. Resistance welding with longer weld times puts more heat into the workpiece and is more likely to show marks on thin or coated panels. Where appearance and flatness matter, we recommend the low-heat processes and confirm the result on your samples before production parameters are fixed.

14. What is the heat-affected zone of this welding process?

The heat-affected zone is the region around the weld where the material has been heated enough to change its microstructure, even though it did not melt. In laser spot welding the zone is a thin rim around the weld spot, typically well under a millimetre, because the energy is delivered in milliseconds. In resistance spot welding the zone is larger, extending around the electrode contact area. A smaller heat-affected zone means less distortion, less discoloration, and better retention of material properties, which is why it matters for thin-gauge and appearance-critical products.

15. How do you weld thin or heat-sensitive parts without distortion?

The approach is to shorten the heating time rather than lower the power. Thin and heat-sensitive parts are welded with short, high-current pulses, which reach welding temperature almost instantly and stop before heat spreads into the surrounding material. Supporting measures matter as much: a backing or heat sink under the joint, well-fitted parts to avoid gaps that force longer weld times, and clean surfaces free of oil or zinc build-up. Capacitor discharge and laser processes are usually the best fit here. We confirm the result on your part during sampling.

16. What causes spatter, porosity, or an undersized weld, and how is each solved?

Each defect has a different cause, so the fix differs. Spatter usually comes from excessive current, insufficient electrode force, or contaminated surfaces; the fix is to increase force, reduce current or time, and clean the joint. Porosity generally indicates surface contamination, coating, or inadequate force. Undersized welds point to insufficient current, worn or misaligned electrodes, or current shunting through a tight fit-up. The practical routine is to check electrode condition and pressure first, then verify parameters against the parameter sheet before adjusting anything.

17. Why does the weld fail on galvanized or coated material?

Galvanized and coated material fails for a predictable reason: the coating has higher resistance and a lower melting point than the steel beneath it, so it can vaporize and disrupt the current path at the moment the weld should form, producing weak or inconsistent welds. The solutions are a sharper current ramp to break through the coating quickly, higher electrode force to contain the vaporization, larger electrode contact faces, and sometimes a pre-pulse. Medium-frequency inverter DC and capacitor discharge systems handle coated steel noticeably better than power-frequency AC machines.

18. What are the most common welding defects in this process and how do operators identify them?

The defects operators meet most often are weak or undersized welds, spatter, surface marking or discoloration, sticking of the electrode to the part, and distortion. Identification is visual and physical: a strength check with a peel test or a scheduled tensile test, a visual check of discoloration and indentation, and a check of electrode condition for wear, alignment, and contamination. Because the same symptom can have several causes, we provide a troubleshooting chart with each machine that maps the symptom to the likely cause and the corrective action.

19. What surface preparation is required before welding?

The weld zone must be clean, dry and conductive. Rust, oil, paint, heavy oxide and moisture are the four things that ruin a weld: on resistance welding they raise contact resistance so the electrode overheats and the result becomes inconsistent, and on laser welding they absorb or scatter the beam. In production terms that means wiping the joint with a degreasing solvent, removing rust and loose scale mechanically, and keeping parts in a clean container rather than an open bin. Galvanized or coated sheet is normally welded as supplied — do not grind the coating away unless the drawing calls for it. If the surface layer cannot be removed, qualify the process on samples instead of assuming it will work.

20. What is the minimum distance between two adjacent weld points?

The limit is set by shunting rather than by a fixed dimension. When a second weld is made close to the first, part of the current bypasses through the nugget that is already there, so the new weld comes out undersized even though the machine settings have not changed. A practical starting point is a centre-to-centre distance of at least three times the expected weld diameter, tightening only after the result has been checked on samples. With very close pitch the usual answers are to reduce the current deliberately, to weld in a sequence that leaves a gap between adjacent points, or to change the electrode shape. Send the weld layout and we will confirm the practical minimum on your part.

21. Can the machine weld three or more layers of sheet at once?

Yes, within the stack thickness the machine can handle, but layered work behaves differently from a simple pair. The layer nearest the electrode takes the most heat, so the far layer can be under-welded while the near one is already over-heated; with three or more layers the weld may also form between the top two sheets and not reach the bottom. Two routes work in practice: a single high-current, short-time shot that penetrates the whole stack, or two successive welds through the same point, joining layer one to two and then two to three. Always quote the individual thicknesses of the stack-up rather than the total, because 1 + 1 + 1 mm and 0.8 + 1.2 + 1 mm are different welding problems.

22. How do you weld a part when only one side is accessible?

Use an indirect or series arrangement. Instead of clamping the part between two opposed electrodes, the welding current enters through the working electrode on the accessible side, travels through the part, and returns through a second contact made on that same side — typically a fixture jaw or a backing bar. This is the standard answer for closed profiles such as tubes, boxes and door frames, where one face is hidden or must stay unmarked. It needs a firm, clean return contact, since a poor return path is what makes indirect welds weak, and it draws noticeably more current than a direct weld. A C-type or scissor gun is the alternative when the flange can be reached from both sides. Send a drawing showing which face must not be marked and where access is possible.

23. Can you weld through adhesive, sealer or primer?

Weld-through primer, yes; cured structural adhesive, no. Zinc-rich weld-through primer is made for exactly this purpose and is used routinely on coated panels, and thin uncured sealer can usually be welded through without changing the process. A fully cured rigid adhesive is a different case: it is an insulator and a contaminant, so the weld point has to be clear of it. That is why adhesive-bonded assemblies normally use a weld-first sequence — apply the adhesive, weld immediately while it is still wet, and cure the assembly in the oven afterwards. If the adhesive has already cured, expect a weak or porous weld. Tell us which product and which sequence you use and we will confirm the order of operations.

24. How does the thickness ratio between the two sheets affect weld quality?

The ratio decides how much of the heat ends up in the thinner sheet. Current heats the metal through its own resistance, and the thinner sheet has less material to carry heat away, so it reaches melting point first; when the ratio is extreme, the thin sheet melts through before the thick one has formed a nugget. As a working rule, ratios up to roughly 1:3 are routine on resistance spot welding; beyond that the electrode shape, the welding schedule and sometimes the joint design have to be adapted, and on very unequal thicknesses a projection or an insert helps concentrate the current. Quote both sheet thicknesses separately — the ratio, not the total thickness, is what usually decides feasibility.

1. What is the difference between AC, medium-frequency inverter DC, and capacitor discharge welding?

The three technologies differ in how the welding current is produced. Power-frequency AC welders use mains current directly, which is simple and economical but the current is affected by mains fluctuation and the weld time is relatively long. Medium-frequency inverter DC machines convert the input to 1000 Hz DC output, giving faster response, more precise current control, higher energy efficiency, and more consistent welds. Capacitor discharge machines store energy in capacitors and release it in a few milliseconds, delivering very high peak current with low instantaneous demand on the grid, which suits projection welding of nuts and bolts and heat-sensitive parts.

2. Why choose medium frequency inverter welding over power-frequency AC?

The difference is measurable: medium-frequency inverter DC machines hold the welding current stable regardless of mains fluctuation, respond faster, and use energy more efficiently than power-frequency AC machines. In production this shows up as more consistent nugget size, less spatter, and less rework, together with lower electricity cost per weld. For thin materials and coated steel, where the window between a good weld and burn-through is narrow, the inverter control is usually the deciding factor. The trade-off is a higher purchase price, so the choice depends on your quality requirement and production volume.

3. When should I choose laser spot welding instead of resistance spot welding?

Choose laser spot welding when surface appearance, low distortion, or access to a restricted welding position is the priority, and the material is within the thickness range of about 0.2 to 3 mm for stainless and carbon steel. Choose resistance spot welding when you need a large nugget and high shear strength on thicker stacks, when welding projection parts such as nuts and studs in high volume, or when the surface appearance does not matter and you want the lowest equipment cost. Many manufacturers use both: resistance welding for structure, laser for visible surfaces.

4. Which technology gives the lowest operating cost per weld?

The lowest cost per weld usually comes from capacitor discharge technology, because energy is stored before welding and released in a short pulse, giving very high current with much lower instantaneous demand on the grid, and the welding time itself is extremely short. Medium-frequency inverter DC machines are next, with good energy efficiency and low consumption per weld. Power-frequency AC machines have the lowest purchase price but the highest energy and rework cost over time. The honest comparison includes consumables, electrode life, and rework rate, not only electricity.

5. What electrode pressure / welding current / stroke does this model provide?

Specifications vary by model, so the answer should be read from the model data sheet rather than generalized. As reference points from our range: the DTB-80 vertical medium-frequency welder provides 25 kA maximum short-circuit current, 6000 N electrode pressure, and 80 mm electrode stroke; the DN-25T desktop precision welder provides 25 kVA capacity, 15 kA short-circuit current, 750 N pressure, and a 50 mm stroke; the DB-170W platform machine provides 2000 N pressure on a 1000 x 800 mm table with 700 to 800 mm electric height adjustment. Tell us which model you are considering and we will confirm the exact parameters.

6. What is the working range and table size of this machine?

Working range depends on the machine type. Platform machines such as the DB-170W use a 1000 x 800 mm table with 700 to 800 mm electric height adjustment and an articulated arm that carries the welding gun across the whole working area. Platform laser machines such as the LSW-1500 offer a 1000 x 600 mm swing-arm working range, customizable to 1200 x 800 mm. Desktop machines are built for small precision parts at the workbench rather than for workpiece size. If you send us the largest and smallest part you weld, we can confirm whether one machine covers the full range.

7. How do I choose between the platform type and the desktop type for my workpiece?

The decision follows the workpiece, not the budget. Choose a platform type machine when the workpiece is large or awkward to move, such as electrical cabinets, elevator door panels, or kitchen equipment: the part stays on the table and the welding gun moves to the weld points. Choose a desktop type machine when the parts are small and precise, such as contacts, terminal wires, coils, or small hardware, and the work is done at a bench. If your production includes both, the usual answer is one machine of each rather than one compromise machine.

8. Can one machine handle a range of different workpieces?

Yes, within a reasonable range, provided the machine is set up with the right electrodes and parameters for each product. Most machines support multiple stored welding programs, so an operator recalls the program for the current part instead of readjusting settings by hand. What limits the range is the physical envelope: table size, throat or arm reach, electrode stroke, and available pressure, together with the thickness window the power supply can cover. Give us your part list with sizes and thicknesses and we will confirm which items one machine can handle.

9. Can this machine be integrated into an automated production line or with a robot?

Yes. The machines are designed with integration in mind. Standardized control signals allow the welding machine to be connected to automatic nut feeders, rotary tables, robot cells, and conveyor lines, and the welding controller accepts start and interlock signals so the weld is triggered only when the part is in position. For robot and line integration, the interface, cycle signal, and safety interlocks are configured during the project. Tell us the equipment you plan to connect and the sequence you need, and we will confirm the interface configuration.

10. Does it support automatic feeding, positioning, or multi-station control?

Yes. Automatic feeding and positioning is available in two forms: an automatic nut feeder that sorts, orients, and feeds welding nuts to the welding position at roughly 5 to 45 nuts per minute with feeding accuracy of 98 percent or higher, and programmable positioning systems on moving-platform machines where the platform travels to each programmed welding point. Multi-station control allows several feeding or welding units to be monitored from one central control system with a touchscreen interface. Which configuration fits depends on your part and takt time.

11. How does the machine communicate with other equipment — PLC signals, interlocks, interfaces?

Communication is handled through control signals and interlocks rather than a proprietary protocol, so the machine can work with other equipment in the line. Typical signals are a start command, a ready or position-confirmed signal, a weld-complete signal, and fault outputs. Interlocking logic prevents invalid sequences: for example, if a nut is not in position the welding cycle is blocked, and if the welding machine is not ready, feeding is interlocked. For lines requiring fieldbus or robot communication, the interface is configured during the project according to the line controller.

12. Can you customize the machine for our workpiece and production layout?

Yes, customization is a core part of what we do, because standard machines rarely match every workpiece. Typical customizations include platform and table dimensions, throat depth and arm length, electrode configuration and pressure, laser power or welding power supply selection, fixture and workpiece positioning, feeding mechanisms, control functions, and multi-product program storage. The machine can also be supplied as a module for integration into an existing line. Send us drawings or samples plus your production requirement and we will propose a configuration.

13. What information do you need from us to design a custom solution?

To design a solution we need four groups of information: the workpiece, including material, thickness, stack-up, dimensions, and a drawing or sample; the joint, including weld point positions and how many welds per part; the production requirement, including takt time, shift pattern, and target output per day; and the site conditions, including available power supply, space, and whether cooling water and compressed air are available. Photos of the current process help as well. With these we can recommend a machine and prepare welding parameters before the order.

14. Can the machine be supplied as a module rather than a complete system?

Both are possible. The machine can be supplied as a complete system, including the welding power supply, machine frame, electrodes, controller, and feeding system, or as a module such as a nut feeder or welding head to work with equipment you already have. Supplying a module is common where an existing welding machine is still in good condition and only the feeding or automation step needs upgrading. Tell us what you already have on site and what you want to automate, and we will confirm which route gives the better return.

15. What is the difference between a stationary machine and a robot-mounted welding gun?

The welding process is the same; what changes is how the electrode is brought to the part. A stationary machine brings the workpiece to the electrode, so it suits parts that a person or a fixture can lift and position, and it usually has a table, a larger transformer and a manual or foot start. A robot-mounted gun brings the electrode to the workpiece, so it suits large, heavy or awkward assemblies that cannot be moved — car bodies being the classic example. Robot guns use a compact, lightweight transformer and take their commands from the line controller. If your part is heavy, or has many weld points on several faces, the robot route is worth costing at the enquiry stage rather than afterwards.

16. Can we start with a manual machine and automate it later?

Yes, and it is often the sensible sequence, provided the machine was specified with that in mind. The economical route is to fit the automation interfaces at the quotation stage — PLC input and output terminals, a clamping signal, and a controller that can later accept a start command from a robot or an indexing table — so the later step is wiring and programming rather than replacement. Buying a stand-alone machine and adapting it afterwards usually costs more, and occasionally cannot be done. Feeder and fixture upgrades are routine retrofits; changing the power supply is not. If automation is likely within two or three years, say so when you ask for the quotation so the transformer and controller are selected with the final layout in mind.

17. How do I know which electrode force is right for my part?

Electrode force has one job: hold the sheets in intimate contact and forge the nugget while it solidifies. Too little force gives spatter, internal voids and an inconsistent nugget; too much craters the surface, which matters on visible parts. It scales with the work — thicker, harder or coated material needs more force, thin cosmetic sheet less. The practical method is to start from the recommended value for your stack-up and then adjust by inspection: a good weld shows a shallow, even indentation with no expulsion. Because force is set mechanically, the machine must be ordered with a force range that covers your thinnest and thickest part, for example 2 000 N on a platform machine or 6 000 N on a vertical inverter machine — confirm the range rather than the nominal figure.

18. Does the machine need a special power supply or a dedicated line?

It needs a supply that matches the machine and is stiff enough not to sag when the weld fires. A spot welder draws a short, heavy current pulse, so a circuit shared with lighting or small machines is not suitable: a dedicated circuit with adequate cable cross-section and a correctly sized breaker is normal practice. Medium-frequency inverter machines draw a much smoother load than power-frequency machines of the same output, which is one reason they suit sites with limited transformer capacity. Give us your site voltage, phase, frequency and the capacity available at the installation point when you ask for the quotation, and we will confirm the electrical specification before the machine is built rather than after.

19. What is the difference between a vibrating-bowl feeder and a step or rotary feeder?

Both deliver oriented parts to the welding position; they tolerate different parts. A vibrating bowl handles small and medium nuts at high speed and is the most economical choice for one or two sizes, but changing part size means changing the bowl tooling. A step or rotary feeder indexes parts through a mechanical track, so it copes better with larger or heavier parts, with parts that jam in a bowl, and it is quieter and less sensitive to surface finish. Where orientation is critical — a weld nut with a shoulder, for example — the mechanical track is often the more reliable answer. Send a sample part and the output rate you need, and we will confirm which feeder fits.

20. Can one machine store programs for several different products?

Yes. The controller stores a parameter set — current, welding time, electrode force, squeeze and hold — for each product, and the operator selects the product number instead of re-entering values. Multi-product storage is what makes a mixed-model line practical: changing from one part to another becomes a program change rather than a mechanical reset. It also protects quality, because a stored program cannot drift the way hand-adjusted values do, and it gives you a written record of what the machine was set to. Tell us how many products you expect to run and how often you change over, and we will confirm the controller's program capacity and the selection method.

1. What is the price range of this machine and what does it include?

The price depends on the configuration rather than being a single figure, and it covers the welding power supply, machine frame and electrodes, welding controller, and standard tooling. Options that change the price include laser power or welding power rating, platform size, automatic feeding or positioning, fixtures, and the level of automation. As a reference, published ranges in our catalogue run from about 4,000 to 6,000 USD for a desktop precision AC welder, 10,000 to 20,000 USD for a platform laser spot welder, and 15,000 to 55,000 USD for higher-power or integrated systems. Tell us your part and requirement and we will quote the exact configuration.

2. What are the running costs — power, consumables, maintenance?

The main running costs are electricity, consumables, and maintenance. Electricity is modest because welding energy is delivered in short pulses; the actual figure depends on your cycle time and power rating. Consumables are electrodes or electrode caps for resistance welding and protective lenses for laser welding, both relatively low-cost items. Maintenance covers cooling water care, electrode dressing, and periodic checks. The largest hidden cost in manual processes is rework and grinding, which low-marking welding reduces or eliminates; that saving usually exceeds the energy cost.

3. How do I compare the total cost of ownership between welding options?

The meaningful comparison is cost per acceptable part produced, not purchase price. Four items decide it: equipment price amortized over output, energy and consumables per part, labor time per part including handling and positioning, and the cost of rework such as grinding, polishing, and scrapped parts. A cheaper power-frequency machine with a higher rework rate often costs more per part than an inverter or laser machine. If you send us your part, material, and current process, we can compare the two routes on your own numbers rather than in general terms.

4. What is the minimum order quantity?

The minimum order quantity is one unit. We supply single machines to small workshops as well as multi-machine configurations to production lines, so trial orders are welcome. For customized or integrated systems, the quantity affects the configuration rather than the minimum order, since fixtures and tooling are prepared per project.

5. What is the standard delivery time, and what affects it?

Standard delivery time is about 14 working days for a standard configuration, counted from order confirmation and receipt of the down payment. What affects it: non-standard customization such as special platform sizes, fixtures, or feeding systems adds engineering and production time; sampling and parameter development before shipment add a few days; and shipping time to your port is separate from production time and depends on the route. We confirm the exact schedule when the order is placed.

6. What is the monthly production capacity, and can you support high-volume orders?

Our monthly production capacity is approximately 100 sets, which covers both standard machines and customized configurations. Higher-volume orders are accommodated by scheduling production in batches so that delivery dates stay realistic. If your project requires a large quantity or a rolling delivery schedule, tell us the required monthly shipment and we will confirm capacity and lead time for that specific plan.

7. How is the machine packed for sea freight, and what are the packing dimensions and weight?

Machines are packed in a wooden case with shockproof protection inside for sea freight, and each packing case carries clear safety and handling labels. The packing dimensions and gross weight are listed on the product data sheet and repeated on the shipping documents, since they affect container loading: for example, a vertical medium-frequency welder packs at about 1230 x 790 x 1950 mm with a gross weight of roughly 392 kg. We provide the packing list and photos before shipment so you can plan unloading equipment and aisle access.

8. What Incoterms and payment terms do you accept?

We accept the common international payment terms: T/T, L/C, and on arrangement D/P and D/A. The usual structure is a down payment with the order and the balance before shipment, with the exact split confirmed in the quotation. For shipping, we work with the Incoterms you prefer, most often FOB for customer-nominated forwarders, and EXW or CIF when you prefer us to handle logistics. Tell us your preferred terms and destination port and we will quote accordingly.

9. Do you provide export documents, and how do you handle documents for customs clearance?

Yes. We provide the standard export document set: commercial invoice, packing list, bill of lading, and certificate of origin where required, together with the machine certificate and test report. Where your customs authority requires additional documents, such as a legalized certificate or specific declaration, tell us at the order stage so the document set can be prepared in advance rather than delayed at the port. We also provide the HS code and machine description for your import declaration.

10. What certifications does the machine carry (CE, ISO, SGS)?

Our machines are supplied with CE, ISO, and SGS certification as applicable to each model, and the certificate for the specific model is included in the document package. Certification status is shown on each product data sheet, since some customized configurations are certified as a project rather than as a standard catalogue model. If you need a certificate for a particular model before ordering, tell us the model and destination country and we will confirm what is available.

11. Can you supply the certificate and test report for our import procedure?

Yes, the machine certificate and test report are provided with the shipment, and we can supply a certificate copy in advance if your import procedure or tender documents require it before arrival. If your authority requires documents in a specific format, a legalized or notarized copy, or an inspection by a nominated third party, please tell us during the project so it can be arranged with enough lead time before shipment.

12. Does the machine meet the electrical standards in our country (voltage, phase, frequency)?

Yes, but this must be confirmed against your site before the order, because power supply differs by country. Our machines are commonly built for 220 V single phase, 380 V three phase, and 50 or 60 Hz supply, and some models are available in more than one voltage version; a two-phase 380 V supply, for example, is used on certain precision welders. Voltage, phase, frequency, and available current capacity all matter. Send us your site supply details and we will confirm the correct configuration and any transformer requirement.

13. Do you sell directly or through a distributor in my country?

Both models are used. Where there is already a partner in the region, the local partner supplies the machine and provides first-line service; elsewhere we quote and ship directly, with remote commissioning support and, where the application requires it, an engineer on site. Direct supply is the usual route for customised systems, because the welding process is developed together with your samples and the discussion is technical rather than purely commercial. Tell us your country and the application and we will confirm which route applies to you, including who would handle installation, spare parts and warranty in your region.

14. Can we see a machine running before we order?

Yes, in three ways, in increasing order of effort. A live video walk-through of the machine running in our workshop, with your application discussed at the same time; a visit to a reference customer already using a similar machine, where one is available in your region; or a visit to our factory, where your samples are welded in front of you. For anything non-standard, welding your own samples before the order is the step we would recommend — a process limitation is far cheaper to find in the trial than after the machine has shipped. Tell us which option suits you and how many people would attend, and we will arrange it.

15. When does the warranty period start?

The warranty period starts on the date written in the contract, which is normally the shipment date. Where installation and commissioning are part of the order it is common to align the start with the commissioning date instead, so you are not losing warranty time while the machine is in transit or waiting on site. The same clause states the scope: which parts are covered, and what is excluded, typically consumables and damage from misuse or an unsuitable power supply. If your purchasing process requires a particular warranty structure, raise it during the quotation so it can be written in from the beginning rather than negotiated after the order.

16. How do we order spare parts after the machine is delivered?

Spare parts are supplied against the machine model and serial number, so keep the nameplate details with your maintenance records. Two practical recommendations. First, order the wear parts you will certainly need together with the machine — electrode tips or caps, protective lenses, feeder wear pads, a water filter — because the freight cost of a small parcel later is often higher than the parts themselves. Second, identify every item by its position number in the spare parts list supplied with the manual, which removes any ambiguity. For a machine that has been in service for some time, a clear photograph of the part is usually the fastest way to confirm it.

17. What payment schedule do you normally work with?

Payment is normally a deposit at order confirmation with the balance before shipment; the exact split, currency and Incoterm are stated in the proforma invoice rather than assumed. The commercial terms should always be read as one package — Incoterm, payment split, delivery time and warranty interact, and changing one usually affects the others. For customised or automated systems the deposit covers engineering and the long-lead items, which is why the split differs from that of a standard machine. If your company works to a fixed internal payment structure, tell us at the enquiry stage and we will confirm what can be accommodated before the quotation is issued.

18. Can we change or cancel an order after it is confirmed?

Changes are possible, and the earlier they are raised the cheaper they are. Before production begins, the specification can usually be adjusted and the quotation reissued; once the frame, the tooling or the transformer has been made, a change means rework and the cost is quoted case by case. For cancellation, the position depends on how far the order has progressed — design, purchased materials, or completed assembly — and the contract states how each stage is treated. Two habits prevent most disputes: put your engineering freeze date in the contract, and keep every change in writing so both sides are working from the same record.

1. What are the space, power supply, water, and air requirements for installing this machine?

Four site requirements need checking before delivery: floor space, power supply, cooling water, and sometimes compressed air. Space must cover the machine footprint plus operator access and workpiece handling room at both ends. Power supply must match the machine rating, including voltage, phase, frequency, and circuit capacity. Water-cooled machines need a cooling water supply and return at the specified flow rate, while air-cooled laser models do not. Air is required for pneumatic feeding or electrode actuators on some models. Send us your site details and we will confirm the requirement list before shipment.

2. Does the machine need water cooling, and what is the required flow rate?

It depends on the model and the duty cycle. Water cooling is used where welding is continuous or the power is high, because the transformer, electrodes, and arms must stay at stable temperature. Reference flow rates from our range are 4 L/min on the desktop precision welder and 12 L/min on the vertical medium-frequency welder. Water quality matters as much as flow: clean, low-hardness water prevents scale build-up in the cooling circuit. Air-cooled laser welders avoid the water circuit altogether where the process allows.

3. What is the weight and footprint, and how should it be handled on arrival?

Weight and footprint are listed on each data sheet, and both matter for handling. As references from our range, the desktop precision welder is 810 x 500 x 680 mm with a net weight of about 120 kg, the vertical medium-frequency welder measures 1180 x 750 x 1830 mm at about 336 kg, and platform machines with a large table are heavier still. Plan for a forklift or crane at the receiving point, a level floor capable of carrying the load, and aisle clearance for the packing case, which is larger than the machine itself.

4. Do you provide on-site installation and commissioning?

Yes, installation and commissioning support is part of the service. For standard machines we provide detailed installation instructions, drawings, and remote guidance, and for customized or integrated systems we can arrange on-site commissioning by our engineers. Commissioning includes mechanical installation checks, electrical connection verification, welding parameter setup on your samples, and operator training. Tell us your site conditions and schedule when planning the order so the visit can be arranged with the shipment rather than after arrival.

5. Can you test our samples before we order, and how long does sampling take?

Yes, and we recommend it before any purchase. Send us your samples or the material and thickness specification and we will weld them, document the parameters, and return the welded samples with photos or a video of the result together with the recommended machine configuration. Sampling usually takes a few working days plus shipping time. This step removes the main risk in buying welding equipment remotely: you judge the weld quality and appearance on your own part before committing.

6. What do you need from us to prepare the welding parameters for our product?

To prepare parameters we need the workpiece material and grade, sheet thickness and full stack-up, part dimensions and joint design, the number and location of welding points, the required surface result, and the required weld strength if it is specified. A drawing or a physical sample is the most reliable input, and photos of the current process help us understand the constraints. If the part is safety relevant, tell us the standard it must meet. With this information the parameters are prepared and verified on samples before shipment.

7. How much training is required to operate this machine?

Training required depends on the process, not on the machine size. Basic operators can be trained in roughly one day on parameter recall, workpiece loading, and routine checks, since the welding programs are stored and recalled rather than adjusted from scratch. Medium-frequency and laser systems are similarly straightforward once parameters are set. What takes longer to learn is defect recognition and parameter troubleshooting, which we cover in a follow-up session and in the written guide. No formal welding qualification is required to operate the machine.

8. Do you provide operation manuals and training videos?

Yes. Each machine is supplied with an operation manual covering installation, parameter setting, routine maintenance, and troubleshooting, together with the parameter sheet prepared for your workpiece and a spare parts list. We also provide training videos for common operations and maintenance tasks, and remote video support for issues that are easier shown than described. The documentation is in English; tell us if another language is required for your operators.

9. Can an operator without welding experience run the machine?

Yes. The machines are designed for production operators rather than welding specialists: welding parameters are prepared and stored, the operator selects the program for the current part, positions the workpiece, and starts the cycle. The skill that matters is consistency in loading and fixture use, plus recognizing when a weld looks wrong. We recommend a simple peel test at the start of each shift as a process check, which any operator can perform. Formal welding certification is not needed.

10. What acceptance criteria should be checked when the machine arrives?

The acceptance check covers four areas: the machine itself, the installation, the weld result, and the documentation. Check that the machine matches the order specification and is undamaged, that all connections including power and cooling are correct and leak-free, and that safety devices function. Then run the agreed samples and confirm weld appearance and strength against the reference sample. Finally confirm that manuals, parameter sheets, certificates, and the spare parts list are complete.

11. How do we verify weld quality during the acceptance test?

Weld quality is verified on samples rather than by inspecting the machine. The agreed method is usually a peel test to reveal nugget size and failure mode, supported by visual inspection for discoloration and indentation, and a tensile or shear test where strength is specified. The acceptance criteria are those established during sampling before shipment, so the comparison is against a documented reference rather than an opinion. Where appearance matters, the reference sample from the pre-shipment sampling is the benchmark.

12. What is the procedure if the machine does not pass acceptance?

If the machine does not pass acceptance, the issue is documented with photos and video, the commissioning engineer adjusts parameters or rectifies the mechanical issue on site where possible, and the check is repeated. If a component is faulty, it is replaced under warranty, and the shipment record keeps the process traceable. Because parameters are verified on your samples before shipment, acceptance disputes are rare; where they do arise, the agreed reference sample and test method are what settle them.

13. Who is responsible for unloading, rigging and positioning on arrival?

Unloading and moving the machine into position is normally the buyer's responsibility, with our support in the form of lifting points, weights and a handling drawing supplied before shipment. Two things are worth arranging before the container arrives: lifting equipment of adequate capacity, and a route from the door to the installation position that the machine will actually fit through. Door widths, ramp gradients and floor loading catch more projects than machine weight does. Ask us for the packing dimensions and lifting points early and pass them to your rigging contractor. The machine must be lifted at the marked points — never by the frame, the arms or the control cabinet.

14. How long does installation and commissioning take?

For a standard machine, one to three working days on site, assuming the power supply, cooling water and compressed air are already in place and the parts to be welded are available. Customised or automated systems take longer, because the fixture and the welding program have to be set up and proven on your production parts — commonly three to seven working days. The largest single variable is not the machine but the site: if the electrical supply is not ready, the schedule slips no matter how well the machine performs. A short pre-installation checklist, sent before dispatch and returned completed, removes most of that risk and is worth doing even when installation is not part of the contract.

15. Can we install and commission the machine ourselves?

Yes, and many customers do. If the welding parameters for your product were established during sampling, they are stored in the controller before dispatch, so a competent maintenance team can complete the mechanical installation, connect power, water and air, and run the acceptance test from the manual, the wiring diagram and the parameter sheet. We support the process with video sessions during commissioning. The conditions are a qualified electrician for the supply connection, a stable installation position, and the same sample material available on site. If your team has not installed a welder before, on-site commissioning is usually the cheaper option overall once downtime is counted.

16. What if our site power supply differs from what we specified?

Tell us before the machine is built. The transformer, contactor and control circuit are selected for a specific supply, and changing from 380 V / 50 Hz to 480 V / 60 Hz afterwards means replacing parts, not adjusting a setting. If the discrepancy is discovered on arrival, the safe sequence is: do not connect the machine, photograph both the machine nameplate and the actual site supply, and contact us. Correct replacement parts and a revised wiring diagram can usually be supplied, but connecting first can destroy the transformer and turn a delivery problem into a repair. Measuring and recording the real voltage, phase and frequency during the enquiry is the cheapest insurance in the whole project.

17. What documents do we receive at handover?

At handover you receive the operation manual, the electrical schematic and wiring diagram, the spare parts list, the parameter sheet for your product, the test report where one was agreed, and the certification documents needed for your import file. Keep all of them together with the machine serial number. The serial number is what identifies the correct drawing revision and parts version later, and it is the first thing we ask for when a service question comes in. If your maintenance system is electronic, ask for digital copies at the same time — retrieving a drawing revision years later is far easier when the serial number is already on file.

18. How do we confirm the machine meets the agreed output rate?

Run a capacity test as part of the acceptance, not after it. The test is simple: with the agreed parameters locked, weld a representative batch — one hour of production, or fifty parts, whichever is meaningful for your product — and measure both the cycle time per part and the reject rate. Compare the result with the rate stated in the contract. It is also worth running the machine at the duty cycle you actually plan to use, because a machine that keeps up at sixty per cent loading can behave differently when it runs continuously. Record the numbers and sign them off with the acceptance documents, so both sides are working from the same baseline afterwards.

1. Which parts are consumables, and how long do they last?

Consumables fall into two groups. In resistance welding they are the electrodes or electrode caps and, in some designs, electrode holders and arms; in laser welding they are the protective lenses at the welding head. Typical service life depends more on duty cycle than on calendar time: electrode life is measured in the number of welds between dressings, and lens life depends on spatter and fume exposure. Everything else, including the transformer, controller, and frame, is a durable part covered by warranty.

2. What is the service life of the electrode, electrode cap, or protective lens?

Service life is counted in welding operations rather than days. Resistance welding electrodes need dressing or replacement after a number of welds that depends on material, current, and coating; galvanized and coated steel shortens it noticeably because of zinc build-up on the electrode face. Laser protective lenses are replaced when contamination or spatter starts to reduce weld quality, and cleaning extends their life. A simple record of welds per shift tells you when the interval is approaching instead of discovering it through poor welds.

3. How much do consumables cost, and how often do they need replacing?

Consumable costs are low relative to production value, and the more useful figure is cost per weld. To calculate it, divide the price of the electrode or lens by the number of welds it produces before replacement; for resistance welding electrodes this typically works out to a fraction of a cent per weld. Replacement frequency follows the same logic: track welds, not weeks. We supply electrodes, electrode holders, protective lenses, and other spares, and recommend keeping a small stock on site so a worn consumable never stops production.

4. What daily and weekly maintenance does the machine require?

Daily checks are short and visual: confirm the cooling water is flowing and the temperature is normal, check the electrode faces for wear, contamination, or misalignment, verify air pressure where pneumatic actuation is used, and clean the work area. Weekly tasks are electrode dressing or replacement as needed, checking cable and hose connections for tightness or leakage, cleaning the welding head and protective lens area, and confirming that stored welding programs still produce the reference weld with a peel test. The full checklist is in the operation manual.

5. How do we maintain the cooling water circuit and prevent scale or blockage?

The cooling circuit needs two things: flow and water quality. Check the flow at the specified rate, keep the water temperature within the recommended range, and use clean, low-hardness water, since hard water deposits scale inside the cooling passages and gradually reduces cooling efficiency until the machine overheats. Inspect and clean the filter or strainer at the recommended interval, check for leaks at connections, and replace the coolant periodically rather than only topping it up. On water-cooled machines, cooling problems are the most common cause of overheating faults.

6. How should the machine be stored or preserved during long production stops?

For production stops of a few days, no special preparation is needed beyond switching off the power and closing the cooling water supply. For longer stops, clean the electrode faces and the welding head, drain the cooling circuit if the machine will be stored below freezing or for several months, lubricate moving parts such as slides and pivots as specified, cover the machine against dust, and keep the control cabinet closed. Before restarting, check water, electrodes, and air supply, then run a peel test before production resumes.

7. What should we check first if the weld strength drops or the machine alarms?

Check the obvious causes first, in this order: electrode condition and alignment, electrode force, cooling water flow and temperature, then welding parameters against the parameter sheet. A drop in strength most often comes from worn or contaminated electrodes, insufficient or uneven force, or cooling problems, rather than from the machine failing. Coated or dirty material is another frequent cause. If the alarm is electrical, note the code, record the conditions, and contact our service team with the machine model and the fault history.

8. How do we troubleshoot unstable welding current or a poor weld appearance?

Unstable current or poor appearance usually traces to a short list: electrode wear or contamination, loose or under-tightened electrode holders and cables, unstable electrode force, insufficient cooling, or mains supply fluctuation on power-frequency machines. Work through the list in order, because changing parameters to compensate for a dirty electrode only moves the problem. If the environment is dusty or oily, increase the cleaning interval. When the cause is not found mechanically, send us the parameter sheet and a photo of the weld and we will analyze it.

9. Is there a self-diagnosis function or fault monitoring on the control system?

Yes. The PLC-based control systems provide fault monitoring and status indication rather than only switching functions. Typical functions include display of the operating state, parameter storage for different products, alarm codes for electrical and sequence faults, and interlock logic that blocks welding when a condition is not met, such as a nut not in position or the machine not ready. This turns many faults into a visible message at the panel instead of an unexplained bad part downstream.

10. What is the warranty period and what does it cover?

Machines are supplied with a standard warranty covering manufacturing defects and key components, and the exact term and coverage are stated in the quotation and contract for your order. Beyond the warranty period we continue to supply spare parts and technical support, and consumables are not covered by warranty since their life depends on duty cycle and maintenance. Tell us your destination country and project when ordering so the warranty conditions for that market are confirmed in writing.

11. How quickly can you respond to a technical issue, and how are spare parts shipped?

Technical issues are answered through remote support first, since most can be diagnosed from a description, a photo, or a short video, and we respond within our normal working hours with the target of a same-day or next-working-day reply. Spare parts are shipped by international courier for urgent items or consolidated with your orders to reduce freight cost; tell us the part number from the spare parts list so the correct item is dispatched the first time. Response times and shipping options for your region are confirmed at the time of order.

12. Do you provide remote support, video guidance, or on-site service?

Yes. Support is structured in three levels: remote support by phone, email, or video call; remote diagnosis with parameter and program adjustments; and on-site service visits where the issue cannot be resolved remotely or where commissioning requires it. Training is provided on site during commissioning, and written guides and videos cover routine tasks so operators can resolve common issues themselves. For integrated systems, support for the line interface is included during the commissioning period.

13. What safety features and protection devices does the machine provide?

The machines include protective features for both the operator and the equipment: guarded or enclosed welding areas where applicable, emergency stop, two-hand or interlocked start where required, over-current and over-temperature protection, cooling circuit monitoring, and machine grounding according to the electrical standard applied. Interlock logic prevents operation in an unsafe condition, for example welding without a part in position. Tell us the safety standard for your country or plant and we will confirm how the configuration meets it.

14. Is laser welding safe for the operator, and what protective equipment is required?

Yes, laser welding is safe when operated correctly, and the essential rule is protecting the eyes. Operators and anyone nearby must wear laser safety glasses matched to the laser wavelength, use enclosed or shielded welding areas where possible, and never look into the beam path or at the operating head directly. Attenuation of the surroundings and warning signage matter as much as personal protection. Skin protection and warm clothing come next, and fume or smoke from coatings should be extracted. We supply guidance for setting up a compliant working area.

15. What are the environmental requirements — fume extraction, noise, disposal of consumables?

Three environmental factors need planning. Fume extraction: laser welding and coated material welding produce smoke or fume, so local extraction at the welding point is recommended, especially for galvanized and painted material. Noise: the process itself is quiet compared with arc or grinding, though feeders and compressors contribute. Waste: consumables such as worn electrodes, protective lenses, and coolant are handled as industrial waste under local regulations. Compliance remains the responsibility of the operator, and we can advise on the typical setup for your process.

16. How do we know when an electrode needs dressing or replacing?

Watch three signals. Appearance: the electrode face flattens and widens, so measure the tip diameter and compare it with the value in the parameter sheet — an oversized face spreads the current and the weld comes out undersized. Weld result: if you have to keep raising the current to hold the same peel strength, the tip has changed. Heat: a discoloured or blued electrode holder face means the contact is poor. Dressing with the correct radius tool restores the face and is almost always cheaper than replacing. On a machine running continuously, put the tip check on the shift checklist — worn electrodes are the single most common cause of a slow, unexplained loss of weld quality.

17. Can we use third-party consumables?

Mechanically interchangeable parts can be used, with two caveats: consumable quality directly affects weld consistency, and non-approved parts can affect the warranty position on anything they damage. Electrode material matters most — the wrong grade wears faster and can contaminate the weld on coated or stainless sheet. The practical split is this: buy electrodes, electrode caps, protective lenses and feeder wear parts from the original supplier and treat them as a production consumable with its own budget line; buy generic items for anything that does not touch the weld, such as filters, hoses and fittings. If you want to source locally, send us the specification and we will confirm whether it is genuinely equivalent.

18. What maintenance should our own operators do?

Five things, on a checklist that takes minutes: clean the electrode faces and check the tip diameter; check the cooling water level, flow and temperature; drain water from the air filter and confirm the pressure; look at the weld on the first part of the shift; and clear the work area of anything that could fall into the weld zone. Then a weekly round: check electrode holders and cables for heat or damage, inspect feeder tracks and wear pads, and clean the filters. This is the maintenance that prevents most breakdowns, and it is deliberately designed to be done by the operator rather than by a service engineer — which is why it belongs in the shift routine, not on a wish list.

19. How do we keep records that support a warranty claim?

Keep a one-page log per machine: serial number, date, what was done, which parts were replaced, and the parameter set in use at the time. Photographs of the weld and of any fault screen are worth more than a written description. When a warranty claim is made, three things decide the outcome quickly — the serial number, the date of the claim relative to the warranty period, and evidence that the machine was operated and maintained as instructed. Keep the delivery documents and the parameter sheet with the log. The record does not need to be elaborate; it needs to be written down while the facts are still fresh, because reconstructing them months later is what makes claims slow.

20. How do you support machines installed at several sites?

The model is remote-first, with local stock for the parts that stop production. Each machine is logged against its serial number, so the drawing revision, parameter set and service history are identifiable when a question comes in, which is what makes remote diagnosis practical. For customers running several sites, two arrangements help: a shared spare parts kit held centrally for the wear items common to all machines, and a named contact on our side who sees the whole fleet rather than individual machines. Where several machines are involved, we also suggest nominating one person in your organisation as the technical owner, so information does not stay scattered across sites.

21. What happens if a power supply or control board fails after the warranty period?

The machine is supported after the warranty period as well; the difference is that parts and any travel are chargeable rather than covered. The failures worth planning for are the control board, the thyristor or inverter module, and the display, all of which are identified by their position number in the spare parts list. Two recommendations: keep the electrical schematic with the machine, and hold one critical spare of any part whose lead time matters to your production. For older machines, a photograph of the nameplate and of the faulty board is usually enough to confirm the correct replacement — provided the serial number is on record, which is why the handover documents matter years later.