EZ Weld TIG wire is a core filled wire, which includes 4% Utechtanite. It is an excellent product for welding cast iron, cast iron to steel, and other dissimilar metals. EZ Weld TIG wire contains no nickel or any other elements considered hazardous to the welder. Our wire wets and flows at a lower temperature. The weld bead stays ahead of the tungsten tip and thus appeals to most welders.