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Investigation of Ultrasonic Assisted Friction Stir Spot Welding of Magnesium Alloy to Aluminum Alloy

  • SCIENTIFIC AND TECHNICAL SECTION
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Strength of Materials Aims and scope

A new welding method: ultrasonic assisted friction stir spot welding (UAFSSW) was put forward in the present study. UAFSSW was successfully applied to weld dissimilar AZ31 Mg alloy and 6061 Al alloy. Results show that for either conventional FSSW or UAFSSW, sound joints are obtained with the upper Mg alloy and lower Al alloy configurations. Ultrasonic vibration is beneficial for the upward flow of lower aluminum alloy, the increase of the stir zone (SZ) width and the refinement of the grains in the SZ. All cross sections of the Al–Mg joints exhibit the formation of intermetallic compounds (IMC) in the SZ. The crack of the conventional FSSW joint propagates exactly along the interface between the dissimilar materials and exhibits an inverted V-shaped morphology. After reaching the highest point of the hook defect, crack of the UAFSSW joint extends to the keyhole, leaving a portion of Mg alloy on the lower sheet. Conventional FSSW and UAFSSW joints show different IMC compositions at the faying interface.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (No. 51204111), the Education Department Foundation of Liaoning Province (Nos. LJQ2012015 and L2012047), the Natural Science Foundation of Liaoning Province (No. 2013024004) and the Project of Science and Technology Department of Liaoning Province (No. 2013222007).

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Authors and Affiliations

  1. Faculty of Aerospace Engineering, Shenyang Aerospace University, Daoyi Development District, Shenyang, China

    S. D. Ji, Z. W. Li, L. Ma, Y. M. Yue & S. S. Gao

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  1. S. D. Ji
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  2. Z. W. Li
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  3. L. Ma
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  4. Y. M. Yue
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  5. S. S. Gao
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Correspondence to S. D. Ji.

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Translated from Problemy Prochnosti, No. 1, pp. 7 – 12, January – February, 2016.

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Ji, S.D., Li, Z.W., Ma, L. et al. Investigation of Ultrasonic Assisted Friction Stir Spot Welding of Magnesium Alloy to Aluminum Alloy. Strength Mater 48, 2–7 (2016). https://doi.org/10.1007/s11223-016-9730-y

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  • DOI: https://doi.org/10.1007/s11223-016-9730-y

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