Direct-current resistance welding apparatus and method of...

B - Operations – Transporting – 23 – K

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B23K 11/24 (2006.01) B23K 11/25 (2006.01)

Patent

CA 2054636

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 de- vice units each comprising a pair of series-connected switching devices, and a plurality of welding transformers connected to the welding guns, respectively, and also con- nected 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 succes- sively energize the switching device units according to s sequence read from a sequence memory circuit.

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