... the working frequency DC of 50Hz into the high frequency of 25KHZ, with built-in IGBT and the application of PWM technique, and reduces ... excellent.Arc igniting is stable and operation is easy with application of HF technique.Protection is perfect: with over-current and over ... .Applications:a. It can be used for welding all kinds of carbon steel, iron, stainless steel, copper, titanium and other ...