Enlarged-end tool for friction stir lap welding towards hook defect controlling  

作　　者：LüZongliang Han Zhenyu Zhu Dong Huang Tifang Huang Yongxian 吕宗亮;韩振宇;朱栋;黄体方;黄永宪(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;Shanghai Lingyun Automobile R&D Branch Company,Lingyun Industrial Corporation Limited,Shanghai 201708,China)

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China [2]Shanghai Lingyun Automobile R&D Branch Company,Lingyun Industrial Corporation Limited,Shanghai 201708,China

出　　处：《China Welding》2020年第1期1-7,共7页中国焊接（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51575132)。

摘　　要：Hook defect is one of the trickiest issues for friction stir lap welding,which remains to be resolved.In this study,a designed pin with an enlarged-end was proposed to control the interfacial hook defect by optimizing its morphology orientation.The insert aduncous structure at the advancing side is dissected by multilayer metallographic observation,which is the main character to terminate the inner-ward extension of the hook.The application of this tool was verified practical with a varied plunge depth of pin into the lower plate from 0.1 mm to 1.6 mm.The angle of the hook was small and terminated at the insert-structure or oriented toward the material convergence region.No joint fractured along the hook line and the highest joint efficiency reached 86%of the parent 6082-T4 aluminum alloy.

关 键 词：friction stir welding welding tool hook defect microstructures mechanical properties 

分 类 号：TG453.9[金属学及工艺—焊接]