Effect of zinc interlayer on Hook defects of aluminum alloy ultrasonic assisted friction stir spot welding joint
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摘要: 对于铝合金的搅拌摩擦点焊，Hook缺陷是制约接头焊接质量的原因之一. 文中提出一种添加锌夹层的超声搅拌摩擦点焊新工艺，在利用超声可提高材料流动性及促进元素扩散的同时，添加纯锌中间层，使界面形成低熔点共晶进一步促进Hook区材料的冶金结合，从而改善Hook形貌，提升接头焊接质量. 结果表明，添加锌夹层可明显改善接头Hook形貌，显著提高了Hook区有效连接面积. 在不同热输入条件下，添加锌夹层后超声搅拌摩擦点焊接头的拉剪强度均有所提高. 当转速为600和1 200 r/min时，添加锌夹层比常规超声搅拌摩擦点焊工艺得到的接头拉剪失效载荷分别提升了21.36%和12.79%.Abstract: Hook defect is one of the factors that restrict the quality of aluminum alloy friction stir spot welding (FSSW) joints. In this paper, a new process of ultrasonic friction stir spot welding (UAFSSW) with zinc interlayer was proposed. Ultrasonic vibration improved the fluidity of the material and promoted the elements diffusion. Meanwhile, by adding pure zinc interlayer, the rapid metallurgical bonding of Hook zone materials can be realized, therefore, the quality of UAFSSW joint can be improved. As the results shown, compared with conventional UAFSSW method, adding zinc interlayer had obvious positive effects on Hook forming of joint. Under different heat input conditions, tensile-shear strengths of UAFSSW joints increased by adding zinc interlayer. The tensile-shear failure load of the joint obtained by adding zinc interlayer method improves 21.36% and 12.79% than conventional UAFSSW process when the rotational speed is 600 and 1 200 r/min, respectively.
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