Welding apparatus

Details Welding apparatus Welding apparatus

H - Electricity

05

B

327/70

H05B 7/00 (2006.01) B23K 9/10 (2006.01)

Patent

CA 1113551

ABSTRACT OF THE DISCLOSURE 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 tapping 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. -1-

311529

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