Adopting microcomputer controlling technique for more accurate, and optimizing welding parameter for keeping the welder in good dynamic response and stable welding current.For MIG welding characteristic of outlay power which secure the performance of metal transfer and effectively stop the welding spatter with stable welding and high quality.Stepless regulation of welding current and voltage for different welding needs and the best welding effect.Having functions to protect from overheating, over-current, over-voltage, short current protection and compensational function for grid.Adopting function of high voltage and slow wire feed, effective striking arc. Split structure fitted for wide range and for carbon steelstainless steelAlCopper and those alloy