... Professional for thin and medium thinckness sheet metal welding 1.Professional for thin and medium thinckness sheet ... alloy steel,aluminum and copper alloy,etc.3.Spot welding two overtapped metal sheet from one side4.Adjusting soft ... quality, no spatter, spray arc, high visibility8.Small welding heat influential area,small transmulation,perfect welding shape9.Overload protection,overheating protection ...