Patent ID: 8969764
Filing Date: 2015-03-03
Classification: B23K

Abstract:
1. A short circuit welding power supply, comprising: a switching power supply which provides a welding current waveform to at least one workpiece to be welded, where said welding current waveform comprises a plurality of welding cycles and each of said welding cycles comprises at least an arc portion and a shorting portion which is initiated after the detection of a short circuit between an electrode and said at least one workpiece; and a controller which controls an output of said switching power supply such that said welding current waveform comprises a plurality of first waveform portions and a plurality of second waveform portions, wherein each of said first and second waveform portions of said welding current waveform comprises a plurality of said welding cycles, wherein all of the current output by said switching power supply during said first portions has a first polarity, and all of the current output by said switching power supply during said second portions has a second polarity, which is opposite of said first polarity, and wherein said controller switches the current output of said switching power supply between said first and second polarities only when a short circuit detection event is detected during welding, and wherein said controller switches between said first and second polarities before said short detection event is cleared by the shorting portion of the cycle which immediately follows the short circuit detection event.