DISSIMILAR FRICTION STIR SPOT WELDING OF ALUMINUM, STEEL, AND BRASS ALLOYS

issimilar friction welded joints namely; A1 1050/37 steel, A1 5052/304 stainless steel, brass/304 stainless steel and A1 1050/brass lap spot joints. The results showed that A1 1050 similar joint was fractured at the base metal, for a rotational speed of 1215 rpm and welding time of 15 seconds with an average fracture load of 7.3 kN. For A1 1050/37 steel joint, the rotational speed ranged from 104 to 1215 rpm and welding time was 15 seconds. The increase in rotation speed resulted in an increase in the fracture load. For A1 5052/304 stainless steel joint, rotational speed of 885 rpm for 15 seconds resulted in a fracture load of 5 kN. For brass/304 stainless steel joint of a rotational speed 855 rpm for 10 seconds welding time, resulted in good joints with average fracture load of 9.9 kN. In case of A1 1050/brass joint, a separation line was obtained between the brass and aluminum, this could be attributed to the formation of inter-metallic compounds of aluminum and copper at the interface.