Control system for resistance welding

Details Control system for resistance welding Control system for resistance welding

1981-07-27

1983-06-07

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

219114, 2191171, B23K 1124

Patent

active

043872891

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: 3582967 (1971-06-01), Beckman et al.
"Soviet Inventions Illustrated," dated Jan. 24, 1979, pp. 26 and 27 of the section Metallurgy.

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