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Residual Stress and Fatigue Strength of Hybrid Laser-MIG-Welded A7N01P-T4

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Abstract

A7N01P-T4 aluminum alloy is widely used in some important welded components of high-speed trains. The hybrid laser-metal inert gas (MIG) welding process was studied to solve problems associated with the MIG welding process, such as low welding efficiency, high residual stress and deformation, and serious loss of strength. A high-speed camera, a voltage and current collection system, and NI DAQ were used to acquire arc profiles, welding voltage, and welding current simultaneously. Thermal cycle tests were carried out. Residual stresses induced by the welding process and fatigue strength of the joint were investigated. Large-size fatigue specimens were used in fatigue tests. The results show that the energy of the hybrid welding process is focused, and the power density of hybrid welding process is intense. The heat input per unit of the hybrid welding process is only half of that of the MIG welding process. Compared with the MIG welded joint, the overall residual stress level of the hybrid-welded joint is lower. The peak longitudinal stress of the hybrid-welded joint is reduced by 20 pct. The fatigue strength of hybrid joints is 14 pct higher than that of MIG-welded joints. Narrow weld and HAZ, weak softening behavior, and low residual stress level are the causes of the improvement of fatigue strength.

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Acknowledgments

This work was financially supported by the National Program on Key Basic Research Project of China (973 Program, Grant No. 2014CB660807).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Qiuying Wang (Ph.D. Candidate), Hui Chen (Professor) & Zongtao Zhu (Lecturer)

  2. CRRC Qingdao Sifang Co., Ltd., Qingdao, 266000, China

    Peixian Qiu (Technologist)

Authors
  1. Qiuying Wang
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  2. Hui Chen
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  3. Peixian Qiu
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  4. Zongtao Zhu
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Corresponding author

Correspondence to Hui Chen.

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Manuscript submitted March 2, 2016.

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Wang, Q., Chen, H., Qiu, P. et al. Residual Stress and Fatigue Strength of Hybrid Laser-MIG-Welded A7N01P-T4. Metall Mater Trans B 48, 591–601 (2017). https://doi.org/10.1007/s11663-016-0782-y

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  • DOI: https://doi.org/10.1007/s11663-016-0782-y

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