Welding apparatus with stepping circuit current control

Details Welding apparatus with stepping circuit current control Welding apparatus with stepping circuit current control

1978-09-19

1981-08-11

Shaw, C. C.

Electric heating

Metal heating

By arc

219132, B23K 910

Patent

active

042836182

ABSTRACT:
DC inert-gas welding apparatus with variable welding current has an automatic controller for reducing the welding current during the various stages of the welding process. The decrease in current is controlled by a single contact of a stepping circuit. A limit switch responsive to the output voltage of the welding apparatus controls the stepping circuit. The circuitry includes a variable search current adjusting resistor and a variable crater filling current adjusting resistor: these resistors are mutually independently variable, and the latter is connected to the tap of a potentiometer for adjusting the welding current. A variable ratio voltage divider connects the stepping circuit via a storage capacitor to the current setting circuit.

REFERENCES:
patent: 2617913 (1952-11-01), Oestreicher
patent: 2951972 (1960-09-01), Pomazal
patent: 3253118 (1966-05-01), Frederick
patent: 3581051 (1971-05-01), Brown
patent: 3689734 (1972-09-01), Burley et al.
patent: 3781640 (1973-12-01), Toth
patent: 4109130 (1978-08-01), Oku

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