Patent ID: 9481046
Filing Date: 2016-11-01
CPC Classification: B23K

Claim Text:
1. A TIG welding power source comprising: a power conversion circuit configured to convert an input current to an output current; a main bridge circuit operatively connected to the power conversion circuit and configured to switch a direction of the output current through a welding output circuit path operatively connected to a welding output of the welding power source at the command of a controller of the welding power source; and an auxiliary bridge circuit operatively connected to the main bridge circuit and configured to introduce a high impedance path between the power conversion circuit and the welding output circuit path at the command of the controller of the welding power source, wherein a welding output current of the welding power supply is an AC output current having a plurality of positive portions and negative portions and wherein said welding output current has a frequency of at least 1 KHz, and an average current output of at least 100 amps.