2026/9/3 - Vertical MF Spot Welder for 1.5+1.0mm Sheet Metal Parts

2026/9/3 - Vertical MF Spot Welder for 1.5+1.0mm Sheet Metal Parts

On September 3, 2026, PDKJ carried out an on-site welding application for a metal stamping industry customer using a Vertical MF Spot Welder. The application focused on spot welding 1.5+1.0mm sheet metal parts on the customer’s own workshop floor, where nugget formation, indentation control on the thin sheet, and weld-to-weld consistency are important for reliable production.

The vertical medium frequency spot welder set up at the customer workshop, with the orange medium frequency controller, pneumatic welding head and foot pedal, next to a bin of stamped sheet metal parts

Application Overview

Customer Welding Requirements

Parts that combine a 1.5mm stamping with a 1.0mm sheet are common in brackets, clips and housings, and they are also one of the harder cases for resistance spot welding. The thicker 1.5mm sheet draws heat away from the faying surface, while the 1.0mm sheet heats quickly and can dent or burn through if the current is pushed up to compensate. Producing a sound nugget without damaging the thin side is fundamentally a heat-balance problem.

This customer makes such 1.5+1.0mm parts in volume and needed to hold both strength and appearance at the same time. A machine with coarse current control swings between cold welds on the thick side and excessive indentation on the thin side, and every die or batch change starts another round of re-tuning. Because the parts are visible in the finished assembly, deep electrode marks and spatter were not acceptable either.

The customer therefore wanted the welding process proven on their own components before committing to production. PDKJ brought a vertical medium frequency spot welder to the workshop and ran the application on site, tuning the parameters on the actual 1.5+1.0mm stacks instead of sample coupons.

The customer needed a welding solution that could provide:

• A sound, consistently sized nugget across the 1.5mm + 1.0mm stack
• No burn-through, cracking or heavy indentation on the 1.0mm sheet
• Stable electrode force from weld to weld, independent of operator technique
• Short weld cycles suited to volume production of stamped parts
• Simple parameter storage and recall for different part variants
• Low-spatter welds that need little or no post-weld cleaning
• Weld settings validated on the customer’s own parts before production

If the nugget on a dissimilar thickness joint is undersized, the spot can pass a visual check and still fail later, pulling out at the faying surface during assembly or in service. If the current is raised to force penetration, the 1.0mm sheet pays the price first: deep electrode marks, tip sticking, expulsion and even holes. Both failure modes are expensive, because they are usually discovered after assembly, when rework means disassembly.

Vertical Medium Frequency Spot Welding Solution for 1.5+1.0mm Parts

The vertical medium frequency spot welder brings together two characteristics that suit dissimilar thickness work. The vertical press design moves the electrode straight down against the part through a rigid arm and pneumatic cylinder, so the electrode force is repeatable and the two sheets stay pressed together while the nugget forms. The medium frequency inverter control rectifies the supply into a regulated DC welding current with real-time feedback, so the heat delivered to the 1.5+1.0mm stack can be set precisely instead of in coarse steps.

On site, the machine was set up with the customer’s electrode caps and a positioning fixture on the lower table for the 1.5+1.0mm parts. Weld current, weld time, hold time and electrode force were tuned on the customer’s actual components: starting from conservative settings, the current was stepped up until the nugget was fully formed across the faying surface, and then hold time and force were adjusted so the 1.0mm sheet showed only a light, uniform indentation.

The touch-screen controller stores each proven schedule, so the operator selects the part variant, places the stack in the fixture and starts the cycle with the foot pedal. Because current, force and timing are held by the machine, joint quality no longer depends on operator technique, which is what makes the process transferable from the trial to daily production.

Close view of the welding side of the vertical MF spot welder, showing the electrode, lower positioning fixture and touch-screen control panel used for the 1.5+1.0mm parts

How the Machine Solves Customer Pain Points

1. Heat Balance Between the 1.5mm and 1.0mm Sheets

The medium frequency inverter regulates the welding current continuously, so heat input can be placed exactly where a 1.5+1.0mm stack needs it: enough to form a full nugget at the faying surface, but not so much that the 1.0mm sheet collapses. That closed-loop control is the core advantage of MF inverter spot welding on dissimilar thicknesses.

2. No Burn-Through or Deep Marks on the Thin Sheet

Fast current feedback keeps the weld pulse short and repeatable, and the pneumatic force spreads the load evenly over the electrode contact area. With the settings proven on site, the 1.0mm side showed a light, consistent electrode mark instead of the dents and hot spots that appear when current is guessed upward.

3. Repeatable Electrode Force, Weld After Weld

The vertical press head closes with a pneumatic cylinder on a rigid frame, so every cycle applies the same force at the same closing speed. Consistent force keeps contact resistance stable, and with it the nugget size across thousands of spots.

4. Stored Schedules for Different Part Variants

Each proven combination of current, time and force is saved as a schedule in the touch-screen controller. When production switches part variants, the operator recalls the schedule instead of re-tuning, removing a whole category of set-up errors.

5. Low-Spatter Welds on Visible Parts

A controlled pulse applied with correct force does not expel molten metal the way an overloaded weld does. The spots on these parts come out clean enough that no grinding or dressing is needed before the parts move on to coating and assembly.

6. Process Validated on the Customer’s Own Parts

All settings were established and checked on the actual 1.5+1.0mm production parts in the customer’s workshop, so the results demonstrated during the on-site application are the results the production line can expect, not laboratory figures.

Welding Process

The welding process can generally be organized as:

Part Loading Into the Positioning Fixture → Schedule Selection for the 1.5+1.0mm Stack → Electrode Closing and Force Build-Up → Medium Frequency Weld Pulse and Nugget Formation → Hold Under Force for Cooling → Electrode Release and Part Unloading → Spot Check for Indentation and Nugget Quality → Volume Production

Before production, welding parameters can be adjusted according to the material, workpiece structure, joint geometry, and required joint performance.

Why Choose a Vertical MF Spot Welder?

Dissimilar thickness spot welding rewards machines that control current precisely and force consistently. The vertical medium frequency inverter spot welder combines a rigid vertical press structure with rectified, closed-loop current control, which is exactly the combination a 1.5+1.0mm joint needs: repeatable pressure to keep the sheets in contact, and precise heat to grow the nugget without damaging the thin sheet.

Compared with conventional AC machines, a medium frequency inverter spot welding machine reacts to changes in the weld zone within milliseconds, holds the set current steady against line fluctuations, and reaches the same weld quality with lower input power. For stamped parts that must look clean as well as hold, that control quality shows up directly in the scrap rate.

This machine class suits manufacturers of stamped brackets, clips, housings and sheet metal assemblies where thin sections and appearance requirements make ordinary spot welding unpredictable. PDKJ builds a range of vertical and platform-type resistance welding machines for these applications.

Key Advantages

• Sound nuggets on 1.5+1.0mm dissimilar thickness stacks
• Light, uniform electrode marks on the 1.0mm sheet
• Closed-loop medium frequency current control
• Pneumatic electrode force with consistent closing speed
• Touch-screen controller with stored weld schedules
• Foot-pedal cycle start for hands-free operation
• Low spatter and minimal post-weld cleaning
• Settings proven on the customer’s own parts on site

Potential Applications

The same welding concept can be considered for various applications, including:

• Stamped brackets and clips with mixed sheet thicknesses
• Sheet metal housings, covers and enclosures
• Automotive and motorcycle small metal parts
• Furniture hardware and fittings
• Electrical mounting plates and terminal assemblies
• Wire forms welded to sheet stampings
• Galvanized and plain steel lap joints in thin sheet

Actual welding capability depends on the material, thickness, joint structure, electrode or fixture configuration, and production requirements.

From Customer-Site Testing to Production

Because the application was run on the customer’s floor, the customer’s own operators saw the machine produce welds on their production parts under their actual working conditions, from the first schedule trial to the final parameter set.

Each parameter iteration was checked on the parts for nugget formation, indentation on the 1.0mm side and consistency across repeated spots, so acceptance was judged against the customer’s own criteria.

The schedules proven on September 3 are stored in the controller, and the machine moves into production with settings that were already validated on the real parts.

Conclusion

The September 3 on-site application demonstrates the use of the Vertical MF Spot Welder for resistance spot welding 1.5+1.0mm sheet metal parts, with the process tuned and accepted directly on the customer’s own components.

For manufacturers of stamped and sheet metal parts, dissimilar thickness joints are a daily reality, and a vertical medium frequency inverter spot welder provides the current precision and force repeatability those joints demand. PDKJ supplies vertical and platform resistance welding machines for exactly these applications, and an on-site trial on your own parts is the most direct way to confirm the results.

PDKJ continues to provide customized laser welding and resistance welding solutions based on different materials, workpiece structures, welding requirements, and production applications.

Related Products

• DTB-80 Industrial Vertical Medium Frequency Inverter Spot Welder
• Platform Type Intermediate-Frequency Inverter Seamless Spot Welding Machine
• DC Pneumatic Spot Welding Machine PLC DTB 80
• Spot Welding Machines
• All PDKJ Welding Machines

Contact PDKJ

Send us your part drawing or sample, and our engineers will run a welding feasibility trial on your own material and recommend the equipment configured for your application.

WhatsApp: +86 136 1279 3248

Email: pdkj101@gd-pw.com

Website: https://www.spotlaserwelding.com/contactus.html

Address: 1-2F, Building 3, Qichen Industrial Park, No. 26 Luxi 1st Road, Liaobu Town, Dongguan City, Guangdong Province, China