Abstract :
Over the past few years, several research programs have been conducted to determine the effect of welding current waveform characteristics on weld qualities.[1]-[3] It was recorded that gradual weld quality improvement was achieved as the output-current waveshape more nearly approached that of a symmetrical square wave. This work resulted in issuance of a patent on such a current waveform control.[4] A square-wave ac control unit has been developed and evaluated and its advantages, along with some practical information regarding weld quality, will be discussed.
