Alumiweld vs Aluminum Weld Was My TIG Welder a Waste of Money This item is in the category Business & Industrial\CNC, Metalworking & Manufacturing\Welding & Soldering Equipment\Welding Equipment & Accessories\Welders, Cutters & Torches\TIG Welders. There is no requirement for the size of the tungsten needle, 1.6, 2.4, 3.2 and other diameters can be used.