Electric heating – Metal heating – By arc
Patent
1998-02-20
1999-12-21
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219133, B23K 910
Patent
active
060052201
ABSTRACT:
A method and apparatus for providing a welding output is disclosed. The apparatus includes a an ac generator having a field winding, a welding output winding and an electronic field controller connected to the field winding. The controller receives a current feedback signal and a voltage feedback signal, and shapes the output curve in response to the desired output command signals. According to one embodiment the controller also receives a field current feedback signal. The controller may shape the output curves to emulate a DC generator, for example by causing the welding output V-A curves to have multiple breakpoints, and/or a substantially preset slope over a welding range wherein the preset slope does not vary over the output current range of the power supply. Also, the slope of the V-A output curve below the welding range may be different than the slope in the welding range. An auxiliary output winding having a substantially constant voltage may be provided on the generator and the generator may be either single or three phase.
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Bunker Thomas A.
Smith Alan F.
Corrigan George R.
Illinois Tool Works Inc.
Shaw Clifford C.
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