Welding machine of the inverse become a usurper mosfet : 1. change the technical, simple, small volume, light weight and efficient energy. second, the ability to network compensation, the supply voltage, current wave soldering, stable and reliable. 3 and unloaded and small, traditional welding machine than 80%. 4 but to save power, disobedient  100khz high rate of, dynamic, in response to an electric arc stability and the arc, low noise, fusing the deep, high strength. 5 and good thrust and  a sticky, apply to all kinds of steel