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Characteristics of Dissimilar Aluminum/Steel Joint Fabricated Via Self-Riveting Friction Stir Lap Welding

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Abstract

AA7075 aluminum and Q235 steel were successfully joined by self-riveting friction stir lap welding (SR-FSLW). The pre-drilled holes of Q235 were filled by AA7075, achieving the self-riveting process. In addition, the AA7075 rivets were locked by the aluminum/steel swirl-layered structure, and the swirl-layered structure consisted of fine grains and intermetallic compounds layers due to the mechanical and metallurgical impacts of SR-FSLW. A cyclic flow of AA7075 was observed inside the rivets, and a plunging-squeezing-filling-locking model was proposed to illustrate the formation mechanism of locked rivets. Compared with the traditional FSLW joint, the shear tensile properties of SR-FSLW joint were significantly enhanced. Moreover, enlarging the diameter of pre-drilled hole contributed to the increment in the effective sheet thickness, strengthening the SR-FSLW joint further. All FSLW/SR-FSLW joints were failed in the nugget zone of AA7075 side, and a mixture of ductile–brittle fracture was observed due to the existence of aluminum/steel hook.

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Acknowledgements

This project is supported by National Natural Science Foundation of China (Grant No.52005090), Natural Science Foundation of Liaoning Province (Grant No.2020-BS-051), Fundamental Research Funds for the Central Universities of China (Grant No.N2103012) and National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University (Grant No.EG202080409).

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, 110819, People’s Republic of China

    Yu Chen & Fenghe Zhang

  2. National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang, 330034, People’s Republic of China

    Yu Chen

  3. School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, People’s Republic of China

    Zhihui Cai

  4. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, People’s Republic of China

    Hua Ding

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  1. Yu Chen
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  2. Zhihui Cai
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  4. Fenghe Zhang
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Correspondence to Zhihui Cai.

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Chen, Y., Cai, Z., Ding, H. et al. Characteristics of Dissimilar Aluminum/Steel Joint Fabricated Via Self-Riveting Friction Stir Lap Welding. Trans Indian Inst Met 74, 2621–2629 (2021). https://doi.org/10.1007/s12666-021-02327-1

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