Electric welder

Details Electric welder Electric welder

1978-09-22

1981-10-06

Shaw, C. C.

Electric heating

Metal heating

By arc

290 1A, 290 31, B23K 910

Patent

active

042937566

ABSTRACT:
A D.C. welder includes an engine-driven D.C. generator, a polarity-reversing 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: 1603830 (1926-10-01), Bliss
patent: 1805207 (1931-05-01), Drury
patent: 2228436 (1941-01-01), Blankenbuehler
patent: 2307364 (1943-01-01), Elkin
patent: 3270207 (1966-08-01), Stockton

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