2A12-T4铝合金自冲摩擦铆焊接头力学行为研究

doi:10.7527/S1000-6893.2021.25111

Abstract

Abstract: To solve the problem of low joining efficiency caused by the prefabricated hole process in interference fit riveting, the friction self-piercing riveting (F-SPR) process is adopted. By using the friction heat generated from high-speed rotation of the semi-hollow rivet for material softening, a mechanical-solid state hybrid joint is achieved without prefabricated holes. Firstly, an appropriate conversion depth of the F-SPR process is determined according to joint forming quality. Then, the microstructure characteristics of typical joints are analyzed, and the influence of feed rate on the macro morphology, hardness distribution as well as joint mechanical properties are studied. The results show that when the conversion depth is 3.5 mm, the defects such as burrs, gaps, insufficient flaring, and cracks can be effectively eliminated. After the F-SPR process, the rivet and the sheets achieved tight connection. The feed rate mainly affected the hardness of the base material in the joint, and then the tensile-shear and cross-tension strength of the joint. The tensile-shear strength of the F-SPR joint can reach about 80% of the tensile strength of the 2A12-T4 aluminum alloy material, showing that the F-SPR joint has great advantages over the joints made by the electromagnetic riveting and the automatic pressure riveting processes.

Key words: friction self-piercing riveting (F-SPR), mechanical-solid state hybrid joining, 2A12 aluminum alloy, mechanical property, tensile-shear, cross-tension

CLC Number:

V261.94

YANG Bingxin, MA Yunwu, SHAN He, YANG Tianhao, SUN Jing, LI Yongbing. Mechanical performance of friction self-piercing riveted joint for 2A12-T4 aluminum alloy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(2): 625111-625111.

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Mechanical performance of friction self-piercing riveted joint for 2A12-T4 aluminum alloy

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