... square wave ac/dc tig welder can used to welded aluminum,aluminum alloy,magnesium alloy,carbon steel,stainless steel 1.upgrade square ... easy to fill wire .is especially suitable for filler wire welding in bicycle inductry.3.super oxide film clean capability , ... cycle,may worl continuously with high current.7.suitable for welding aluminum and its alloy ,carbon steel,stainless steel,copper ,titanium ...