Impact Toughness of Friction Stir Welded Al-Mg Alloy*

Abstract Al-Mg 5083 alloy was friction stir welded by varying welding variables, i. e., rotational speed, traversal speed and tool tilt angle. Welded specimens have been tested by the instrumented Charpy test to evaluate total absorbed energy, as well as the energy for crack initiation and the energy for crack growth. Subsequently, the fracture surface was examined by optical and scanning electron microscopy (SEM) to evaluate surface type of fracture, and to correlate the microstructure with the impact energy. Based on this, the optimum windows of FSW parameters for Al-Mg 5083 alloy welding have been defined.