Direct-current resistance welding apparatus and method of contro

Details Direct-current resistance welding apparatus and method of contro Direct-current resistance welding apparatus and method of contro

1991-10-30

1992-12-15

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 1124

Patent

active

051719606

ABSTRACT:
A direct-current resistance welding apparatus includes pneumatic actuators for pressurizing welding guns, respectively, to grip respective workpieces, an inverter composed of a plurality of parallel-connected switching device units each comprising a pair of series-connected switching devices, and a plurality of welding transformers connected to the welding guns, respectively, and also connected between the switching device units. A timer circuit applies an energization signal to energize the switching device units. The pneumatic actuators are actuated by a control circuit to pressurize the welding guns and successively energize the switching device units according to s sequence read from a sequence memory circuit.

REFERENCES:
patent: 5072090 (1991-12-01), Morita

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