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Effect of Sleeve Plunge Depth on Microstructure and Mechanical Properties of Refill Friction Stir Spot Welding of 2198 Aluminum Alloy

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Abstract

Refill friction stir spot welding (RFSSW) is a new spot welding technology, by which spot joint without keyhole can be obtained. In this work, RFSSW was used to join 2-mm-thick 2198-T8 aluminum alloy sheets and effects of the sleeve plunge depth on microstructure and lap shear properties of the joints were mainly discussed. Results showed that when using small plunge depths of 2.4 and 2.6 mm, joints showed good formation and no defects were observed. Incomplete refilling defect was observed with increasing plunge depth due to material loss during welding. Size of the grains at sleeve-affected zone (SAZ) is smaller than that at the pin-affected zone, and the size becomes bigger with increasing the plunge depth. More secondary phase particles can be observed at SAZ with increasing the sleeve plunge depth. The lap shear failure load firstly increased and then decreased with increasing the sleeve plunge depth. The maximum failure load of 9819 N was attained with plug fracture mode when using 2.6 mm. Fracture morphologies show ductile fracture mode.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Nos. 51204111 and 51405309), the Program for Liaoning Excellent Talents in University (No. LJQ2015084) and the Aeronautical Science Foundation of China (2014ZE54021).

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Authors and Affiliations

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

    Yumei Yue, Yao Shi, Shude Ji & Yue Wang

  2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

    Zhengwei Li

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  1. Yumei Yue
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  2. Yao Shi
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  4. Yue Wang
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  5. Zhengwei Li
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Correspondence to Shude Ji or Zhengwei Li.

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Yue, Y., Shi, Y., Ji, S. et al. Effect of Sleeve Plunge Depth on Microstructure and Mechanical Properties of Refill Friction Stir Spot Welding of 2198 Aluminum Alloy. J. of Materi Eng and Perform 26, 5064–5071 (2017). https://doi.org/10.1007/s11665-017-2929-7

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  • DOI: https://doi.org/10.1007/s11665-017-2929-7

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