钢-铝热致搅拌摩擦点焊工艺研究  

Study on Heating Friction Stir Spot Welding Process of Steel-aluminum

作　　者：胥锴[1] 崔强[1] 崔琪睿 XU Kai;CUI Qiang;CUI Qirui(Department of Mechanical Engineering,Anhui Technical College of Mechanical and Electrical Engineering,Wuhu 241000,China;College of Science,Northwestern Polytechnical University,Xi＇an 710072,China)

机构地区：[1]安徽机电职业技术学院机械工程系,安徽芜湖241000 [2]西北工业大学理学院,陕西西安710072

出　　处：《新乡学院学报》2018年第6期48-51,共4页Journal of Xinxiang University

基　　金：安徽省高校自然科学重点研究项目(KJ2017A750)

摘　　要：采用热致搅拌摩擦点焊连接工艺,对DP590钢与6061铝板进行了搭接点焊实验,通过电镜扫描与拉伸试验研究了焊接接头的微观组织和力学性能。结果表明:采用热致搅拌摩擦点焊连接工艺可以获得成形较好的铝-钢异种金属点焊的搭接接头;在搅拌头旋转速度为1 000 r/min、扎入深度为0.2 mm、停留时间为90 s及焊接压力为0.2 MPa、冷却空气流量为20 L/min的条件下,焊缝表面成形质量较好,表面光亮,退出孔较小;在搅拌针的作用下,搅拌区里的钢-铝产生了强烈的塑性剪切变形与流动,这两种材料能充分混合在一起,呈现出河流状的流动特征;剪切断裂是微孔形核长大和聚合在断口上留下的痕迹。The experiment of lap welding between DP590 steel and 6061 aluminum plate was carried out by Heating Friction Stir Spot Welding（ HFSSW）. The microstructure and mechanical prope rties of the welded joint were studied by scanning electron microscope and tensile test. The results showed the following aspects. The better lap joint of dissimilar metal of steel and aluminum could be obtained by the thermally induced friction stir spot welding process. The surface quality of the weld seam would be good and bright, and the exit hole would be small under the condition that the depth of the mixing head was 0.2 mm, the residence time of the stirring head 90 s, the welding pressure 0.2 MPa, the stirring tool rotary speed 1 000 r/min and cooling air flow rate 20 L/min. The steel-aluminum produced a strong plastic shear deformation and flow under the action of the stirring needle. These two materials could be fully mixed together and showed the flow characteristics of the river, with shear fracture being the trace left by microporous nucleation＇s growth and polymerization.

关 键 词：热致搅拌摩擦点焊 点焊工艺 塑性流动 

分 类 号：TG453.9[金属学及工艺—焊接]