Belchfire Torches: BELCHFIRE Torches are used by welding fabricators, iron foundries, cast iron repair shops, heavy equipment manufacturers and marine service shops where high temperature preheating and post heating of metals are required. Used for foundry ladle heating, foundry crucibles, preheating metal for fabrication, heating for welding cast iron, heating for welding nickel, and heating for cast iron crack repair using natural gas sources.