Electric heating – Metal heating – By arc
Reexamination Certificate
2007-10-16
2007-10-16
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
Reexamination Certificate
active
11503682
ABSTRACT:
An electric arc welding system and method for creating a first AC welding arc with a first current waveform between a first electrode and a workpiece by a first power supply and a second AC welding arc with a second current waveform between a second electrode and a workpiece by a second power supply as the first and second electrodes are moved in unison along a welding path where the first and second power supply each comprising an high speed switching inverter creating its waveform by a number of current pulses occurring at a frequency of at least 18 kHz with the magnitude of each current pulse controlled by a wave shaper and the polarity of the waveforms controlled by a signal. The first and second AC waveforms each have a positive portion and a negative portion and a cycle period of about 10-20 ms and timing circuits for determining the push and pull times between the arcs and a waveform adjusting circuit to limit the push and pull times to less than about 5.0 ms.
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European Search Report, Application No. EP 04 02 4450, Mar. 14, 2005, Examiner T. Jeggy.
Houston William S.
Myers Russell K.
Fay Sharpe LLP
Lincoln Global Inc.
Shaw Clifford C.
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