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Effect of post-weld heat treatment on microstructure and mechanical properties of friction stir welded SSM7075 aluminium alloy

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Abstract

7XXX series aluminium alloys generally present low weldability by fusion welding methods because of the sensitivity to weld solidification cracking, vaporization of strengthening alloys and other defects in the fusion zone. Friction stir welding (FSW) can be deployed successfully with aluminium alloys. We presented the effect of post-weld heat treatment (PWHT) on the microstructure and mechanical properties of SSM7075 joints. Semi solid plates were butt-welded by FSW at a rotation speed of 1110 r/min, welding speeds of 70 and 110 mm/min. Solution treatment, artificial aging, and T6 (solution treatment and artificial aging combined) were applied to the welded joints, each with three samples. It was found that the T6 joints at the speed of 70 mm/min yielded the highest tensile strength of 459.23 MPa. This condition best enhanced the mechanical properties of FSW SSM7075 aluminium alloy joints.

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Acknowledgements

The authors are grateful to the Department of Mining and Materials Engineering, Prince of Songkla University, as well as the PSU Graduate School, for their combined scholarships and research fund as well as partially funded by National Research Universities (NRU). Assistance from the Welding and Joining Research Team at the Department, especially Mr. Jarun Tamjai and Mr. Chaiyoot Meengam for their kind supports, is also appreciated.

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Authors and Affiliations

  1. Department of Mining and Materials Engineering, Faculty of Engineering, Prince of Songkla University, Hatyai, Songkhla, 90112, Thailand

    Muangjunburee Prapas & Naktewan Jennarong

  2. Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Hatyai, Songkhla, 90112, Thailand

    Prachasaree Woraphot

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  1. Muangjunburee Prapas
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  2. Naktewan Jennarong
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  3. Prachasaree Woraphot
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Corresponding author

Correspondence to Muangjunburee Prapas.

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Partially Funded by National Research Universities (NRU) (ENG 5805855), Faculty of Engineering, Prince of Songkla University, Hatyai Songkhla, Thailand

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Prapas, M., Jennarong, N. & Woraphot, P. Effect of post-weld heat treatment on microstructure and mechanical properties of friction stir welded SSM7075 aluminium alloy. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 32, 1420–1425 (2017). https://doi.org/10.1007/s11595-017-1763-y

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  • DOI: https://doi.org/10.1007/s11595-017-1763-y

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