| Abstract Scope |
Friction Stir Welding (FSW) is expected as one of industrial solutions to fabricate high performance dissimilar metal welds consisting of the materials to which normal fusion welding process(es) is (are) hardly applied. However, the strength of FSWed T-lap joint, especially for the fatigue failures, has not been satisfactory so far, due to formation of some undesirable defects in the joint; e.g. tunnel, kissing bond, zigzag line, bonding line, oxide line defects, etc., those directly degraded the mechanical properties of the joint. In this work the fatigue strength of dissimilar metal FSWed T-lap joint between AA7075 and AA5083 was studied, paying attention to the fatigue crack nucleation sites and the morphologies. Some fracture mechanics strategies are proposed to improve the fatigue strength associating with enough rupture ductility. |