The dissimilar friction stir lap welding of 1A99 Al to pure ...
However, over higher rotation speed with more heat input and high tool pressure could cause over mechanical extrusion, as seen in Figs. 3c and 5b, thus more Zn metal was extruded into the Al matrix. As a result, the joint strength may decrease. Furthermore, over higher rotation speed with lower traverse speed, thus the Zn metal was extruded away at the welding center caused the direct contact ...