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Effect of ultrasonic impact time on microstructure and properties of 7A52 aluminum alloy tandem MIG welded joint

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Abstract

7A52 (Al-Zn-Mg-Cu) alloy is a high-strength aluminum alloy; its welded joints are often accompanied by defects such as poor wear resistance and low fatigue strength. Herein, we try to optimize the welded joint of 7A52 aluminum alloy by using ultrasonic impact treatment (UIT). Generally, the mechanical properties such as microhardness and fatigue strength of the welded joint after UIT will be improved. 7A52 aluminum alloy tandem metal inert gas (MIG) welded joints with UIT time per unit area of 2.5 min, 5 min, 10 min, 15 min, 30 min, and 75 min were studied. Through the surface topography, microstructure observation, and mechanical properties test, the time parameters of excessive treatment, lack of treatment, and proper treatment were selected, and the effects of UIT, excessive treatment, lack of treatment, and proper treatment on fatigue strength were analyzed. Test results show that the mechanical properties of welded joints after UIT are improved. The proper treatment time is 15min and its fatigue strength is 37.86MPa, respectively, under the stress ratio of 0.1. Compared to the original welding condition with a fatigue strength of 28.61MPa, the fatigue strength of the welded joints of 7A52 aluminum alloy increased by 32.33%. The largest percentage of grain size reduction occurs when the UIT is 15 min. Moreover, excessive treatment and lack of treatment will not further refine the grains and optimize the mechanical properties.

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The data presented in this study are available on request from the corresponding author.

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Funding

This research was supported by National Natural Science Foundation of China (51165026) (51765053) and Natural Science Foundation of Inner Mongolia Autonomous Region (2015MS9537).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China

    Furong Chen, Yihang Yang & Nan Li

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  1. Furong Chen
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  2. Yihang Yang
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Contributions

Furong Chen: conceptualization; validation; supervision; project administration; project administration; supervision, funding acquisition.

Yihang Yang: software; validation; formal analysis; data curation; writing—original draft preparation; writing—review and editing; visualization.

Nan Li: conceptualization; methodology; validation; investigation; resources.

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Correspondence to Yihang Yang.

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Chen, F., Yang, Y. & Li, N. Effect of ultrasonic impact time on microstructure and properties of 7A52 aluminum alloy tandem MIG welded joint. Int J Adv Manuf Technol 116, 2687–2696 (2021). https://doi.org/10.1007/s00170-021-07599-x

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