A Novel Friction Stir Spot Riveting of Al/Cu Dissimilar Materials  

作　　者：Jinglin Liu Qi Song Lihui Song Shude Ji Mingshen Li Zhen Jia Kang Yang 

机构地区：[1]College of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China [2]China North Industries Corp.,Beijing 100053,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2021年第1期135-144,共10页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.51705339 and 51905355)。

摘　　要：In order to eliminate the disadvantages of the keyhole in conventional friction stir spot welding joint and attain the highstrength lap joint of Al/Cu dissimilar metals,a novel welding technique,named as friction stir spot riveting(FSSR),was proposed.A pinless tool and an extra filling stud were employed.The Al/Cu spot joints without keyhole defect were achieved by the FSSR.A Cu anchor-like structure was formed,which greatly increased the mechanical interlocking between the upper Al sheet and lower Cu sheet.The thin intermetallic compounds containing CuAl2 and CuAl at the Al/Cu interface strengthened the joining interface between the Al sheet and the Cu stud.Increasing rotating velocity increased frictional heat and plastic deformation and then eliminated the interfacial joining defects.The FSSR joint with the maximum tensile shear load of 3.50 kN was achieved at a rotating velocity of 1800 rpm and a dwell time of 20 s,whose fracture path passed through the softened region of upper Al sheet.In summary,the novel FSSR technique has the advantages of strong mechanical interlocking and metallurgical bonding between dissimilar materials,thereby attaining the high-strength spot joint.

关 键 词：Al/Cu dissimilar materials Friction stir spot riveting Intermetallic compounds Microstructures Tensile shear strength 

分 类 号：TG453.9[金属学及工艺—焊接]