POSTALLOY® 53-SPL is a solid, gas-shielded welding wire, is designed for joining and build-up on various types of cast iron, such as ductile, nodular, gray, and Ni-resist. Also for welding cast iron and cast iron to steel or stainless steel. The unique chemistry of POSTALLOY® 53-SPL provides weld deposits that are fully machinable. Under normal circumstances, if dilution is kept to a minimum, there is no undercutting and weld deposits can be machined through the fusion zone, even with high speed steel tooling.