Automatic stepper for resistance welding

Details Automatic stepper for resistance welding Automatic stepper for resistance welding

1988-05-09

1989-12-05

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219114, 2191171, B23K 1124

Patent

active

048854514

ABSTRACT:
A method is disclosed for controlling the magnitude of current delivered through welding electrodes to a workpiece to be welded using resistance welding techniques, in order to prevent weld expulsion and concomitant diminishment of weld quality. Weld expulsion is detected by determining changes in resistance during formation of the weld, by periodically determining the power factor, and the primary circuit of the welding transformer. The power factor is determined by determining the relative timing between the commencement of the applied voltage, the zero crossover point of the applied voltage, and the ensuing zero point of the applied current.

REFERENCES:
patent: 3546421 (1970-12-01), Meyer
patent: 4254466 (1981-03-01), Jurek
patent: 4289948 (1981-09-01), Jurek et al.
patent: 4399511 (1983-08-01), Jurek
patent: 4634830 (1987-01-01), Furudate

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