AZ31 magnesium alloy was welded by double-sided friction stir welding (FSW) in this study. The different rotation directions of the upper tool were adopted during double-sided FSW. The results showed that different rotation directions generated different joint structures. After double-sided FSW, the effects of the different tool rotation direction and welding parameters on microstructure, especially microtexture, and mechanical properties were evaluated.
The laser brazing of Ti6Al4V and A6061 alloys with 2mm thickness was conducted by focusing laser beam on aluminum alloy side, and the effects of welding conditions including offset distance on the microstructures and mechanical properties of the dissimilar butt joints were investigated. It was found that the offset distance had a great influence on the thickness of intermetallic compound layer and the mechanical properties of the joint.