Abstract
Three types of friction welded joint of C4641 naval brasS and S25C carbon steel were produced under thee kinds of friction pressure welding conditions with different upset pressures. In the friction interface, the organization of the naval brass was fine grained. It was confirmed that the friction heat affected one part. Tensile strength was 47%, 57%, 70% of the naval brass base metal tensile strength in proportion to the upset pressure, when these joints tensile tests were performed. The upset pressure seemed to affect the tensile strength. This study conducted fatigue tesK on a friction welded joint of high tensile strength to examine pressure welding conditions and their relation to fatigue strength. The fatigue strength of the joint exhibited a value similar to the S25C base meta1. The near interface was the rupture position from the fracture surface tensile test and fatigue test observations. The part with the weak joint was located on thc naval brass side, which is similar to the friction surface.
