Resistance welding with pressure control in response to deviatio

Details Resistance welding with pressure control in response to deviatio Resistance welding with pressure control in response to deviatio

1982-01-04

1983-10-04

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

219 8641, 2191171, B23K 1124

Patent

active

044081146

ABSTRACT:
A system for resistance welding in which the welding voltage between the electrodes is controlled by changing the pressure applied to the electrodes or the firing phase angle of the welding current in accordance with a reference voltage curve or a reference voltage integration curve. The system comprises a voltage sensor, a reference voltage generator, a differential amplifier, and a pressure control device, or a calculating unit for determining an appropriate firing phase angle of the welding current. The system thus improved can ensure a stable, good welding quality, since the welding voltage is always controlled by a series of optimum welding voltages, during the welding process, in accordance with a reference voltage curve with respect to time, preferably in terms of cycles of the welding current.

REFERENCES:
patent: 3068350 (1962-12-01), Archer
patent: 3654424 (1972-04-01), Vanderhelst
patent: 3727822 (1973-04-01), Umbaugh
"Soviet Inventions Illustrated", dated Jan. 24, 1979, pp. 26 and 27 of the section Metallurgy.

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