... MIG 160 ,diy ac arc welder,portable,fan-cooled thermostatic protection ,four pole current adjust.ce approved MIG160 arc welding machine, advantages ... 5.effcient productivity ,good welding quanlity,no dregs,open arc,small heat affect zone,small strain and beautiful look ... protecting function,good reliability7.increase in eletric arc self-locking function user need,easing off degree of welder's fatigue.