Electric welder with current-voltage feedback circuit that provi

Details Electric welder with current-voltage feedback circuit that provi Electric welder with current-voltage feedback circuit that provi

1981-04-20

1984-08-14

Shaw, C. C.

Electric heating

Metal heating

By arc

21913033, 322 25, B23K 910

Patent

active

044659202

ABSTRACT:
A D.C. welder includes an engine-driven D.C. generator, a polarity-revers switch which can change the direction of current flow through the field winding of that generator to provide a positive or negative polarity at the welder output terminals, a circuit that automatically permits only uni-directional current flow through that field winding during the starting of the engine, and a further circuit that energizes a solenoid to close contacts which enable that generator to operate as the starting motor for that engine but which thereafter de-energizes that solenoid and then keeps it de-energized until the engine is at, or close to, rest.

REFERENCES:
patent: 2228436 (1941-01-01), Blankenbuehler
patent: 2458658 (1949-01-01), Tyrner
patent: 2620465 (1952-12-01), Giroz
patent: 3530359 (1970-09-01), Grist
patent: 3535491 (1970-10-01), Krolski
patent: 3912980 (1975-10-01), Crump et al.

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