... DC Square Wave TIG welding machine, can use DC to weld steel, also can use AC to weld aluminum, with remote current control. Inverter AC/DC TIG Welding Machine ... and over-current. 3.Stable arc,beautiful welding surface and easy operation.4.Current can ... steel,copper and Titanor metal etc. by DC function, also be able to weld aluminium ... thickness(mm)15 AC/DC Square Wave TIG welding machine(WSE-315)