stamping part and electrical contact: Copper,brass and silver stamping part and electrical contact Stamping parts and electrical contact:1: Face material: ... Ni, CuNiZn, Monel, rivet material: solid silver alloy contacts and bimetal contacts, welding material: Ag, AgNi, AgCuNi, AgSnO28: ... : 0.5-80tons, Germany and Japan Auto welding system, Japan auto stamping and riveting assembly system. 12: Surface ...