Friction stir welding process for dissimilar metal alloys

摘要

The present invention relates to a friction stir welding process for joining two members having different shearing strengths, and a friction stir welded structure fabricated by the process. The friction stir welding process includes the step of positioning a first welded member 3 and a second welded member 2 such that both members overlap each other, thereby defining an overlapped region 2b, and the step of inserting a rotating pin 10 into the overlapped region from a surface of the second welded member 2, so that the first 3 and second 2 welded members are joined together. In this process, the first welded member 3 (the one furthest from the welding tool 1) has a lower shearing strength than that of the second welded member 2. The first welded member 3 may be made of Al-Si alloy, and the second welded member 2 may be made of Al-Mg alloy.