Refill friction stir spot welding of 5083-O aluminum alloy  

作　　者：Zhiwu Xu Zhengwei Li Shude Ji Liguo Zhang 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology [2]Faculty of Aerospace Engineering,Shenyang Aerospace University

出　　处：《Journal of Materials Science & Technology》2018年第5期878-885,共8页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.51204111)

摘　　要：In this work,refill friction stir spot welding（RFSSW） was used to weld 2 mm-thick 5083-O alloy.The Box–Behnken experimental design was used to investigate the effect of welding parameters on the joint lap shear property.Results showed that a surface indentation of 0.3 mm effectively eliminated the welding defects.Microhardness of the stir zone（SZ） was higher than that of the base material（BM） and the hardness decreased with increasing the heat input during welding.The optimum failure load of 7.72 k N was obtained when using rotating speed of 2300 rpm,plunge depth of 2.4 mm and refilling time of 3.5 s.Three fracture modes were obtained during the lap shear test and all were affected by the hook defect.In this work,refill friction stir spot welding（RFSSW） was used to weld 2 mm-thick 5083-O alloy.The Box–Behnken experimental design was used to investigate the effect of welding parameters on the joint lap shear property.Results showed that a surface indentation of 0.3 mm effectively eliminated the welding defects.Microhardness of the stir zone（SZ） was higher than that of the base material（BM） and the hardness decreased with increasing the heat input during welding.The optimum failure load of 7.72 k N was obtained when using rotating speed of 2300 rpm,plunge depth of 2.4 mm and refilling time of 3.5 s.Three fracture modes were obtained during the lap shear test and all were affected by the hook defect.

关 键 词：Refill friction stir spot welding KEYHOLE Secondary phases MICROHARDNESS Lap shear failure load 

分 类 号：TG453.9[金属学及工艺—焊接] TS912.53[轻工技术与工程]