Parameters optimization and character analysis of the zero-weld-thinning friction stir welding process of aluminum alloy
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摘要: 为提高无减薄搅拌摩擦焊接头力学性能，基于响应面法对参数进行优化，建立了响应面模型，并对模型进行回归分析. 结果表明，无减薄搅拌摩擦焊是成形优良的焊接工艺，而且焊接参数对接头拉伸性能影响明显，其中主轴转速及焊接速度对其影响更为显著. 在无缺陷条件下，提高主轴转速的同时选取适中的焊接速度，以得到性能更优的焊接接头. 焊接参数为主轴转速1 000 r/min，焊接速度200 mm/min、轴肩下压量0.25 mm时，接头的抗拉强度最大为363 MPa，为母材的94.3%，断后伸长率11.2%. 而且相比于常规搅拌摩擦焊，无减薄搅拌摩擦焊在厚度方向上的性能更加均匀.Abstract: The welding parameters were optimized based on the response surface method in order to improve the mechanical properties of the zero-weld-thinning friction stir welding joints. The response surface model and regression analysis were built. The results showed that zero-weld-thinning friction stir welding was a well-formed welding process. The tensile properties of the joints were obviously influenced by the welding parameters, the rotation speed and welding speed had more significant effect. High rotation speed and moderate welding speed should be selected to get better welding joint without any defects. Under the condition of the rotation speed of 1 000 r/min, the welding speed of 200 mm/min and the shoulder plunge depth of 0.25 mm, the tensile strength of the joints reached to the maximum 363 MPa, which was 94.3 percent of the base metal. The elongation was 11.2%. In comparison to conventional friction stir welding, the mechanical properties of the zero-weld-thinning friction stir welding joint were more homogeneous along thickness direction.
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