Electric arc welder

Details Electric arc welder Electric arc welder

2006-09-12

2006-09-12

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

By arc

Reexamination Certificate

active

07105773

ABSTRACT:
An electric arc welder for depositing weld metal along a groove between two edges of a metal workpiece where the welder comprises a first electrode driven by a first wire feeder toward a point in said groove, a second electrode driven by a second wire feeder toward the point and a main power source with a first output terminal connected to the first electrode and a second output terminal connected both to the second electrode and directly or indirectly to the metal workpiece to create a second electrode path and a workpiece path. The power source includes a high speed switching output stage for creating current with a selected AC waveform between the first and second output terminals where the waveform of the main power source is generated by a waveform generator controlling a pulse width modulator circuit to determine the current operation of the output stage.

REFERENCES:
patent: 2669640 (1954-02-01), Outcalt et al.
patent: 4246463 (1981-01-01), Shutt
patent: 5278390 (1994-01-01), Blankenship
patent: 6111216 (2000-08-01), Stava
patent: 6207929 (2001-03-01), Stava
patent: 6291798 (2001-09-01), Stava
patent: 6472634 (2002-10-01), Houston
The Lincoln Electric Company—Another Arc Welding Development—The Lincoln One Side System—Jun. 1992.

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