Phosphor Bronze Cu5180 AWS A5.7 ERCuSn-A Particularly suitable for the welding of copper with Cu-Sn alloy , especially for the joining welding of Cu-Zn alloy with steel. Can also be used in repairing cast copper product. Pre-heat suggested for large size products, and pulsed arc welding is recommended for multilayer on steel. We can supply copper wire ,rod and ring diameter: 0.5-5.0mm Standard