Variable polarity power supply for welding

Details Variable polarity power supply for welding Variable polarity power supply for welding

1989-03-27

1990-10-16

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913031, 219137PS, B23K 9073

Patent

active

049637150

ABSTRACT:
Disclosed is a variable polarity power supply for arc welding that quickly switches between polarities in order to more easily re-establish the arc. The variable polarity power supply includes a current-limited boost circuit for providing increased open circuit voltage to re-establish the arc, while limiting the re-establishment current. The variable polarity power supply is particularly suitable for computer-controlled welding applications because it periodically restarts the arc in either direction without using high frequency radiation, and provides quick switching times along with a low reverse current to reduce the heat in the torch, thereby increasing the longevity of the torch.

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