Friction welding of C4641 naval brass to C1100 tough pitch copper was carried out to examine this weldability. Joint strength was evaluated from tensile, bending and impact strength. The tensile strength which is almost equivalent to that of C1100 base metal could be obtained under the wide welding conditions. An intermetallic formation at the weld interface of joints was not observed. The naval brass adjacent to the weld interface was softened and tensile fracture occurred in this softened area. The joint efficiencies in bending testing and impact testing of joints welded under a large upset pressure were 87% and 47%, respectively.
