... metal conductor for ground circuit. See IEEE std.80-1976.Exothermic welding mainly weld pure copper, brass, bronze, copper, copper-clad steel, ... steel, ductile iron, zinc plated steel, cast iron, copper alloy, alloy steel and etc.Welding materials produced by our ... occupational diseases risks for operators and emission gasses has no pollution to atmosphere.Our company adopts unique formula with delay ...