Perfectly weld on lots of materials including carbon steel,alloy steel,aluminum and copper alloy,etc 1 ... on lots of materials including carbon steel,alloy steel,aluminum and copper alloy,etc.3.Spot welding two overtapped metal sheet ... spatter, spray arc, high visibility8.Small welding heat influential area,small transmulation,perfect welding shape9.Overload protection,overheating protection EE-MM2350 ...