Electric heating – Metal heating – By arc
Reexamination Certificate
2006-09-19
2006-09-19
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
C219S130330
Reexamination Certificate
active
07109439
ABSTRACT:
An electric arc welder operated to perform a short circuit welding process between an electrode and a workpiece, where the process comprises a succession of alternate short circuit conditions and arc conditions, with a first current waveform during the short circuit condition and a second voltage waveform during the arc condition. A first waveform generator constructs the first waveform from a series of current pulses controlled by a pulse wave modulator operated at a rate greater than 18 kHz and a second waveform generator constructs the second waveform from a series of current pulses controlled by a pulse wave modulator operated at a rate greater than 18 kHz. The second waveform generator has a circuit to generate the second waveform with a generally constant arc parameter, generally voltage.
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Lincoln Global Inc.
Shaw Clifford C.
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