Inside Our Assembly Floor: How a Machine Moves From Bay to Crate

Visitors walking our aisle in Dongguan usually ask the same question about halfway down: why are the machines standing in long rows instead of being built one at a time in a corner? The answer explains most of what a buyer sees at a factory acceptance test.

The floor is laid out by stage rather than by product. What follows is a walk through the four stages, from the inside, including the two places where the arrangement still costs us time.

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The assembly floor in Dongguan: machines standing in numbered bays, each bay a position in a sequence rather than a home for one product.

The Floor Is Organised by Stage, Not by Product

The assembly area is marked in numbered bays, C01 to C04, and each bay is a position in a sequence, not a permanent home for one type of machine. A unit enters at the frame end, moves forward as stages are completed, and is not supposed to travel backwards. A platform spot welder and a custom multi-head machine will pass through the same bays in the same order; what differs is how long each one sits in a given position.

The consequence for a buyer is that your machine shares a row with other orders. When someone asks where their machine is, the honest answer is a bay number and a stage, not a percentage - a bay number can be photographed, a percentage cannot.

Stage One: Frame, Fixture and the First Fit

The frame, transformer and fixture go in first, and the fixture is located against the drawing rather than against the previous machine. This sounds obvious until a batch of thirty identical brackets is welded and the last one is checked against the first. The check is geometric: does the welding head reach every point on the part drawing with the clamps closed.

If a part cannot be loaded without removing a clamp, we want to know here, while a fixture plate can still be re-machined - not at the bench, and certainly not on site.

Stage Two: Wiring and the First Power-Up

Electrical panel, pneumatic runs and the cooling circuit are completed at the next position. Continuity and insulation checks come before any power is applied, and the first power-up is dry: no workpiece, no programme running, only the safety chain and the interlocks being proven in the order the machine will use them.

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A technician working at the base of a spot welding machine in the assembly bay.

Whoever wires a machine signs the wiring sheet for that serial number. That signature matters later: when a fault appears eighteen months after delivery, the sheet tells us which revision the cabinet was built to, and whether the as-built drawing in the file is the one that matches it.

Stage Three: The Test Bench

The load test is where the machine stops being an assembly and becomes a welding machine. We run the buyer part, record the programme number, the electrode force or the laser power and the result we accepted, and keep the sample. If the buyer has not sent parts, we test on a comparable material and say so in the record rather than implying the buyer part was used.

Nothing moves past this point until the record exists: an untested machine is not one waiting for packing, it is an open question.

Stage Four: Packing and the Handover

The last position is packing, and it is also where the paperwork is completed rather than started. The four stages, who owns each one, and the record each leaves behind:

Stage	Who owns it	What has to be true to move on	Record left behind
Frame, fixture, first fit	Assembly bay	Every weld point reachable with clamps closed	Layout check against the part drawing
Wiring and first power-up	Electrical	Continuity, insulation and interlock chain proven	Signed wiring sheet for that serial number
Test bench	Commissioning	Buyer part run, parameters and result accepted	Test record with programme number and sample
Packing	Shipping	Crate measured, packing list matches the invoice lines	Packing list with measured weights

Where the Layout Still Slows Us Down

Two things still cost us time. Long machines and multi-head gantries block the aisle while they are being wired, so the bays behind them wait even when their own work is finished. And because the floor is one queue, a stall at the test bench - a missing buyer part, for instance - holds not one machine but the row. The buffer we use is to park tested but unpacked machines at the end of the row, which keeps the queue moving and eats floor space.

What This Means If You Are Ordering

Four questions get a useful answer from a supplier running a staged floor like ours.

Which bay and which stage is my machine at this week, and can you send a photograph?
Has the wiring sheet been signed, and which drawing revision does it correspond to?
What did the test bench record, on which material, and can I see the sample?
What can still change after the test, and what would that change cost in schedule?

None of these need a factory visit to answer. A supplier who answers them from records is one whose floor you can follow from a distance.

Conclusion

Organising a floor by stage rather than by product is not the tidiest arrangement to look at. It is, however, the one that makes a machine traceable: every position leaves a record, and every record points back to a bay, a serial number and a drawing revision. That chain is what a buyer is really inspecting when they walk the aisle.

Requirements vary by destination market. Always confirm against the current edition of the applicable standard and with your certification body.

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

Inside Our Assembly Floor: How A Machine Moves From Bay To Crate