铝-钢异种材料回填式搅拌摩擦点焊接头界面连接机制与力学性能研究  

Study on Interface Bonding Mechanism and Mechanical Properties of Aluminum Steel Dissimilar Material Refill Friction Stir Spot Welding Joint

作　　者：李聪 尤佳庆 张悦[1] 杨浩坤 赵运强 LI Cong;YOU Jiaqing;ZHANG Yue;YANG Haokun;ZHAO Yunqiang(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Key Laboratory of Modern Welding Technology of Guangdong Province,China-Ukraine Institute of Welding,Guangdong Academy of Sciences,Guangzhou 510650,China;Smart Manufacturing Division,Hong Kong Productivity Council,Hong Kong 999077,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]广东省科学院中乌焊接研究所广东省现代焊接技术重点实验室,广东广州510650 [3]香港生产力促进局智能制造部,中国香港999077

出　　处：《热加工工艺》2024年第11期53-59,65,共8页Hot Working Technology

基　　金：广东省科技计划项目(2022A0505050054);国家自然科学基金项目(51905112);广东省科协科技计划项目(SKXRC202221);东莞市重点领域研发项目(20201200300122)。

摘　　要：以5754铝合金与DC04钢为研究对象,进行了铝板在上的回填式搅拌摩擦点焊试验,研究了搅拌套下扎深度对铝-钢界面微观组织特征与接头力学性能的影响。结果表明,当搅拌套未扎入下层钢板时,冶金结合为铝-钢界面的主要连接机制。当搅拌套扎入下层钢板时,铝-钢界面同时发生机械咬合与冶金结合,其中,机械咬合主要发生在搅拌套作用区。通过工艺优化得出最优工艺参数为:转速2000 r/min、焊速0.5 mm/s,搅拌套下扎深度1.45 mm,此时接头最大拉剪失效载荷达5105 N。Taking 5754 aluminum alloy and DC04 steel as the base materials,the refill friction stir spot welding tests were carried out,which revealed the effects of penetration depth of the stirring sleeve on the microstructure characteristics and the mechanical properties of the joints.The results show that metallurgical bonding is the main bonding mechanism of aluminum-steel interface when the stirring sleeve is not inserted into the lower steel plate.When the stirring sleeve is inserted into the lower steel plate,the aluminum-steel interface simultaneously undergoes mechanical interlocking and metallurgical bonding.The mechanical interlocking mainly occurs in the action area of the stirring sleeve.Through optimizing process parameters,the optimal parameters are obtained as follows:the rotational speed,welding speed and sleeve penetration depth are 2000 r/min,0.5 mm/s and 1.45 mm,respectively.The maximumtensile shear failure load of the joint is 5105 N.

关 键 词：异种材料 回填式搅拌摩擦点焊 拉剪载荷 连接机制 

分 类 号：TG453.9[金属学及工艺—焊接]