Friction Stir Welding Process of Dissimilar Aluminum Alloys
The friction stir welding butt experiment was carried out on ZL114 aluminum alloy and 6061 aluminium alloy with thickness of 5 mm.Effects of welding parameters on morphology and mechanical properties of ZL114/6061 dissimilar aluminum alloy friction stir welded joints were investigated.The orthogonal test results indicate that the rota-tion speed of the stirring head has the greatest influence on the strength of the welded joint,followed by the walking speed of the stirring head,and the reduction rate has the least influence.With the rotation speed of 1 200 r/min,walk-ing speed of 200 mm/s,and the reduction rate of 0.1 mm,the desirable performance of the welded joint can be obtained,where the average tensile strength and elongation are 285 MPa and 9.17%,which reach over 89%and 54%of those of base metal,respectively.The grain distribution in weld nugget zone is fine,while that in thermal affected zone is slender and reaches the lowest hardness.The tensile fracture type of welded joint is characterized by ductile-brittle mixed fracture.
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