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Passive filling friction stir repairing AZ31-B magnesium alloy by external stationary shoulder

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Abstract

In order to repair the varied-shaped volume defect adjacent to metal structure surface, passive filling friction stir repairing using an external stationary shoulder was put forward. The material flow model during the repairing process was established to explain why the stationary shoulder improves the quality of repaired region. The relation between microstructures and microhardnesses was attained. The results reflect that the stationary shoulder can transfer more materials into the stir zone (SZ) and absorb more heat generated in the SZ. These effects are beneficial to not only avoiding the hole defect in the SZ, but also greatly refining the grain and then heightening the microhardness in the SZ top region. Therefore, the addition of the stationary shoulder plays an important positive role on the repairing process, especially when the extra filling material is used.

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Funding

This work is supported by the National Natural Science Foundation of China (No. 51705339), the China Postdoctoral Science Foundation (No.2016M590821), and the Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships (No.2017B030302010).

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Author notes

  1. Shiyu Niu and Baosheng Wu contributed equally to this work.

Authors and Affiliations

  1. Faculty of Aerospace Engineering, Shenyang Aerospace University, Shenyang, 110136, People’s Republic of China

    Shiyu Niu, Baosheng Wu, Lin Ma & Zan Lv

  2. Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships, CSSC Huangpu Wenchong Shipbuilding Company Limited, Guangzhou, 510715, People’s Republic of China

    Dejun Yan

Authors
  1. Shiyu Niu
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  2. Baosheng Wu
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  3. Lin Ma
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  4. Zan Lv
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  5. Dejun Yan
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Corresponding author

Correspondence to Lin Ma.

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Niu, S., Wu, B., Ma, L. et al. Passive filling friction stir repairing AZ31-B magnesium alloy by external stationary shoulder. Int J Adv Manuf Technol 97, 2461–2468 (2018). https://doi.org/10.1007/s00170-018-2130-7

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  • DOI: https://doi.org/10.1007/s00170-018-2130-7

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