Abstract
AZ31 magnesium alloy plate with 6.4 mm thickness was friction stir welded using a N/C controlled vertical type milling machine. The impact properties of FSW joint was investigated by the instrumented Charpy impact tester and SEM. Regardless of the welding conditions, the impact strength of FSW joint showed higher value than that of the base metal. FSW joint with welding feed of 0.2 mm/s was shown the highest value regardless of the rotational speed. The crack generational energy of FSW joint was higher than that of the base metal. All the impact tested FSW joints showed a ductile fracture on which dimples were found.
