Method of friction stir welding dissimilar metals and workpiece assemblies formed thereby

摘要

In a process for friction stir welding together pieces of dissimilar material, a first piece of a second metal is overlaid onto a first piece of a first metal that is dissimilar from the second metal such that at least a portion of the first piece of second metal overlaps a portion of the first piece of first metal. A second piece of the first metal is placed in side-to-side relationship with the first piece of second metal and overlies another portion of the first piece of first metal. The relative arrangement between the second piece of first metal and the first piece of second metal define a joint line overlying the first piece of first metal. The first piece of first metal, the first piece of second metal, and the second piece of first metal are friction stir welded together along the joint line.