1. the question, using mosfet contrary, easily change the technical, 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%.
2. Adopt MOSFET technology, brief and easy electronic circult, compact, light and eneryg-saving.
3. 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