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Study of process/structure/property relationships in probeless friction stir spot welded AA2198 Al-Li alloy

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Abstract

Probeless friction stir spot welding (probeless FSSW) is a useful variant of conventional friction stir spot welding (FSSW), where there is no probe at the end of the tool shoulder. In this study, AA2198-T8 aluminum-lithium alloy has been successfully welded by probeless FSSW. The variations of geometric features of probeless FSSWed joints: stir zone width, stir zone edge angle and hook angle, and their effects on the joint mechanical properties were studied quantitatively. Results show that the width of stir zone is constrained by shoulder diameter, and the ratio of the width to shoulder diameter approaches 0.9. With the increase of stir zone depth, the stir zone edge angle approaches 45° eventually during the welding process. Additionally, the hook defect can be found among all of the probeless FSSWed joints due to the upward material flow of the lower sheet. When the hook angle is around 90°, the tensile/shear strength reaches a relatively higher value. The fracture mode changes from shear fracture to plug fracture when hook angle transforms from obtuse to acute.

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Acknowledgements

The authors would like to appreciate the financial support from the National Natural Science Foundation of China (51574196), the Open Fund of Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures (2014003), and the 111 Project (B08040).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, People’s Republic of China

    Q. Chu, W. Y. Li & X. W. Yang

  2. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics, Geesthacht, 21502, Germany

    J. J. Shen

  3. Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Y. B. Li

  4. China FSW Center, Beijing, 100024, People’s Republic of China

    W. B. Wang

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  1. Q. Chu
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  2. W. Y. Li
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  3. X. W. Yang
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  4. J. J. Shen
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  5. Y. B. Li
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Correspondence to W. Y. Li.

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Recommended for publication by Commission III - Resistance Welding, Solid State Welding, and Allied Joining Process

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Chu, Q., Li, W.Y., Yang, X.W. et al. Study of process/structure/property relationships in probeless friction stir spot welded AA2198 Al-Li alloy. Weld World 61, 291–298 (2017). https://doi.org/10.1007/s40194-017-0423-3

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  • DOI: https://doi.org/10.1007/s40194-017-0423-3

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