Roller seam welding is a press welding method process. Roller seam welding is used to produce load-bearing spot sequences and
to produce liquid- or gas-tight seams. It produces welding spots arranged at fixed intervals. Pulsed current flows are generated with roller-shaped
electrodes. Overlapping welding spots lead, with the corresponding process quality, to gas- or liquid-tight seams.
Welding with variable AC:
A frequency converter is used on the primary side of the welding transformer. The welding current pulse width and the required pulse frequency (the frequency width can be preset in the converter's basic menu) can be set here.
The frequency converter works on the output side with square wave voltages. This results, depending on the transformer inductance, in a welding current which consists of a rising and a falling e-function. It is clear from figure 4 that variable output pulses from the frequency converter change not only the magnitude of the current, but also the
current-time ratio and therefore can influence the welding energy for each welding spot. The maximum welding pulse time, e.g. at 200 Hz = 2.5 ms.
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