Study on Plastic Joining Mechanism of Friction Stir Rivet Welding Using Threaded Rivet and Mechanical Properties of Its Joints

doi:10.3901/JME.2022.08.126

Abstract

Abstract: In order to obtain high-performance spot joints of aluminum alloy sheets and combine the advantages of mechanical joining and metallurgical bonding, different welding tools are employed to joining aluminum alloy sheets using friction stir rivet welding (FSRW) method. The main spindle welding force, macrostructure and plastic deformation mechanism, and mechanical properties as well as failure behaviors of the three type joints are comparatively investigated to clarify the strengthening mechanism of the joints' mechanical properties via threaded rivet FSRW process. The results indicate that with the feeding of the main spindle, the welding force decreases slightly after increases to the peak rapidly, and then decreases to a minimum until the main spindle retreat back during the FSRW process. Metallurgical bonding is formed between the upper and lower sheets of the threaded rivet FSRWed joint, while mechanical riveting is formed between the threaded rivet and the plasticized material. The effective thickness of the upper sheet under the shoulder, the effective bonding width of the stirring zone, and the effective riveting height between the rivet and the welded material are the most important process parameters that affect the mechanical properties of the threaded rivet FSRWed joints. The maximum tensile shear load of the threaded rivet FSRWed joint is 1.65 times that of the FSSWed joint, while the maximum cross tensile load is 2.7 times.

Key words: friction stir rivet welding, threaded rivet, material flow behavior, joining mechanism, mechanical property

CLC Number:

TG441

ZHANG Peng, ZHAO Shengdun, ZHANG Chuanwei, CHEN Zheng, FEI Liangyu, ZHANG Jiaying. Study on Plastic Joining Mechanism of Friction Stir Rivet Welding Using Threaded Rivet and Mechanical Properties of Its Joints[J]. Journal of Mechanical Engineering, 2022, 58(8): 126-135.

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