クロム銅棒とステンレス鋼板の摩擦圧接継手の強度

抄録

Stud welding has been widely used for the welding of bar to plate. However, it is difficult to weld dissimilar metals in this method. Thus, the authors have begun to examine the welding of the dissimilar stud joints using friction welding. In the present study, stud joints of copper–chromium alloy bar to SUS304L stainless steel plate were friction welded. In all joints, even burrs were generated from the bar side and the plate side did not deformed, and there were no cracks at the weld interface. The heat affected zones of the copper–chromium alloy bar side was significantly softened. Joint strength was evaluated by tensile testing, fatigue testing and bending testing. In the tensile testing, all joints were fractured near the weld interface, and the maximum tensile strength was 350 MPa. In the fatigue testing, joints were fractured in the softened area of the copper–chromium alloy bar near the weld interface, and the fatigue limits of joints were 39–43 MPa. In the bending testing, all joints were cracked near the weld interface at the bending angle of 50–55 degree.