AA6061-T6铝薄板无针搅拌摩擦点焊接头结构及性能分析  

Analysis of microstructure and mechanical properties of probeless friction stir spot welding joint in AA6061-T6 aluminum thin plate

作　　者：于贵申 陈鑫[1] 武子涛 陈轶雄 张冠宸 YU Gui-shen;CHEN Xin;WU Zi-tao;CHEN Yi-xiong;ZHANG Guan-chen(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China)

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130022

出　　处：《吉林大学学报（工学版）》2023年第5期1338-1344,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家重点研发计划项目(2022YFB250350-3);吉林省校合作项目(SXGJSF2017-2-1-5);吉林大学研究生创新研究计划项目(101832020CX128)。

摘　　要：以车身覆盖件用1.5 mm厚AA6061-T6铝薄板为研究对象,采用Box-Behnken试验设计分析了不同焊接参数对无针搅拌摩擦点焊(PFSSW)接头力学性能及断裂模式的影响规律。通过响应面方法(RSM)对PFSSW接头的拉剪性能进行优化。结果表明:焊点的金相呈现“盆形”结构,当搅拌头转速为2950 r/min、下压量为0.6 mm和停留时间为7 s时,接头的最高拉剪失效载荷为6.41 kN。PFSSW焊点断口呈现3种断裂模式。其中,焊核拔出模式下接头的平均失效载荷最高(6.26 kN),界面分离断裂模式最低(4.89 kN),混合断裂模式居中(5.60 kN)。The effect of welding parameters on the tensile-shear mechanical properties and the fracture modes of probeless friction stir spot welding(PFSSW) joints was analyzed by Box-Behnken test design.The base material is 1.5 mm thick AA6061-T6 aluminum thin plate,which is commonly used in automobile body coverings.The tensile shear performance of PFSSW joints was optimized by response surface methodology(RSM).The results show that the metallographic structure of PFSSW joint is basinshaped.The maximum tensile-shear failure load(TSFL) of 6.41 kN was obtained with the rotating speed of 2950 r/min,the plunging depth of 0.6 mm and the dwell time of 7 s.There are three types of PFSSW joint fracture modes.Among them,the nugget pull-out mode exhibited the highest average failure load(6.26 kN),interface separation mode was the lowest(4.89 kN) and mixed-mode was in the middle(5.60kN).

关 键 词：车辆工程 无针搅拌摩擦点焊 拉剪失效载荷 参数优化 微观结构 断口形貌 

分 类 号：U465.2[一般工业技术—材料科学与工程]