Effect of welding direction on joining dissimilar alloys between AA5083 and A6N01 by friction stir welding

Abstract

Friction Stir Welding (FSW) succeeded in producing high quality dissimilar welds with AA5083 and A6N01 by evaluation of the microstructure and the root bend testing. A6N01 with a wide optimum range of welding condition should be placed on the retreating side to weld sound joint between AA5083 and A6N01. The optimum welding condition of FSW for the dissimilar alloys between AA5083 and A6N01 was wider than that of AA5083. In the opposite orientation, A6N01 on the advancing side can hardly flow into AA5083 on the retreating side in front of the tool. As the pores on inappropriate welding condition were observed, large pores on a lower tool rotation speed were different from small discontinuous pores on a higher tool rotation speed.