Introduction:

AWS A5.7 ERCuSn-A. ERCuSn-A is a copper-zinc bronze containing approximately 5% tin and up to 0.35% phosphorus added as a deoxidizer used to weld bronze and brass.  It can also be used to weld copper if the presence of tin in the weld metal is not objectionable.

Application:

Suitable for the welding of copper with Cu-Sn alloy, especially for the butt joining welding of brass with steel. Can also be used in repairing cast copper product. Pre-heat suggested for large size products, and pulsed argon arc welding is recommended for multilayer hardfacing on steel.