When you start thinking of using plasma cutter tig welder you must choose the material to weld because there are two different type of products being used in tig welding.
1)AC/DC products are capable of welding metals including aluminium
2)DC products can weld steel,stainless steel and alloys but not recommended for aluminium.
Welding as we know is to joint two materials mostly metals and steel.Tig welder are being used for years and as we know also there are many product which can be used for welding and cutting either by Miller,Hobart and Lincoln even Longevity Inc.