Effect of Submillimeter Variation in Plunge Depth on Microstructure and Mechanical Properties of FSLW 2A12 Aluminum Alloy Joints

作     者：Dan Chen Jinglong Li Huaxia Zhao Zhejun Tan Jiangtao Xiong Dan Chen;Jinglong Li;Huaxia Zhao;Zhejun Tan;Jiangtao Xiong

作者机构：State Key Laboratory of Solidifi cation ProcessingNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi’an 710072China AVIC Manufacture Technology InstituteBeijing 100024China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2020年第33卷第1期

页      面：165-171页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：The authors would like to thank Dr. Junmiao Shi for his guidance in the Introduction  Dr. Feng Jin for his logical proof  and Ms. Xujing Nan for her graphing assistance 

主　　题：Submillimeter Plunge depth Mechanical properties Friction stir lap welding 

摘      要：Friction stir lap welding was conducted on 2 mm + 2 mm sheets of aluminum alloy 2 A12-T4. The plunge depth(PLD) was designed as 2.45–2.58 mm, which was varied in submillimeters as 2.45, 2.50, 2.53, 2.55, and 2.58 mm, and the axial force was recorded in the welding process. The results show that the PLD fluctuation in submillimeters causes significant variation in the axial force and affects the voids(i.e., Void I and Void II), hook, and effective sheet thickness(EST), among which Void I is the main factor that affects the EST. The fracture load–PLD function in the tensile shear test of the joints follows the rule of the EST–PLD function. An optimized PLD is approximately 2.55 mm, at which the EST reaches 1.71 mm, corresponding to a peak fracture load of 11.03 kN. Thus, a PLD of 2.55 mm is suggested with a tolerance of 0.02 mm, corresponding to a fracture load of 9.6–11.0 kN, i.e., within a fluctuation of 12%.