Friction Stir Welding Technique of LF6 Aluminum Alloy Sheets

Friction stir welding technique of LF6 aluminum alloy sheets was studied by experiments, technique parameters were optimized, surface shape in welding seam and microstructure and mechanical properties of joints were analyzed. It is found that LF6 aluminum alloy have favorable friction stir weldability, dynamic recrystallization occurre and grains are made smaller in welding seam, joints′ strength are improved to achieve that of matrix or even be higher than the latter by optimizing technique parameters.