Deoxidized Copper (AWS A5.7: ERCu / DIN 1733SG-CuSn) is a filler metal used for brazing or oxyacetylene welding of steels, cast iron, malleable iron, copper alloys, nickel alloys and nickel alloys. The addition of tin improves strength and corrosion resistance in the weld deposit. A borax-boric acid flux is generally required. Flux-coated in different colors can be supplied as requested.