Phos Bronze (GMAW) description: This copper-tin alloy is used to weld copper-tin composition base metals, and to weld copper alloys, including brass to steel. Used to weld base metals of steel, cast iron, copper, brass, and bronze, and it is the Ideal overlay on shafts, propellers, housings, couplings, bushings, valve seats, pumps, and other surfaces needing a bronze wearing surface.