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Effects of Post-welded Heat Treated on the AZ31B Magnesium Alloy Joint Welded by Automatic TIG Welding

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Advances in Materials Processing (CMC 2017)

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

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Abstract

The automatic TIG welding on AZ31B alloys was carried out by the six-axis robot in the present work. After post-welded heat treatment (PWHT), the microstructure, precipitates, and mechanical properties of the AZ31B joints were investigated by using the optical microscope (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The experimental results reveal that after PWHT, the microstructure and mechanical properties of the AZ31B joints were both significantly improved. After PWHT, the grains of the AZ31B joint were still fine, whereas the number of the precipitates along with the grain boundaries was dramatically decreased. The ultimate tensile strength (UTS) and the elongation (EL) of the PWHT AZ31B joints were up to the 100 and 96.9% of the base metal (BM), respectively.

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Acknowledgements

This work is supported by the National Key Research and Development plan of China (Grant No. 2017YFB0103904, 2016YFB0301105), the Shandong Province Key Research and Development Plan, China (Grant No. 2017CXGC0404, 2016ZDJS02A09), and the Youth Foundation of Shandong Academy of Sciences, China (Grant No. 2016QN015).

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Authors and Affiliations

  1. Shandong Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Shandong Academy of Sciences, Jinan, 250014, China

    Hongtao Liu, Jixue Zhou & Jinwei Wang

  2. Shandong Urban Construction Vocational College, Jinan, 250103, China

    Wenyi Cheng

  3. Shandong Institute of Commerce and Technology, Jinan, 250103, China

    Ruochao Wang

  4. Shandong Engineering Research Center for Lightweight Automobiles Magnesium Alloys, Advanced Materials Institute, Shandong Academy of Sciences, Jinan, 250014, China

    Yanfei Chen

  5. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Yuansheng Yang

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  1. Hongtao Liu
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  2. Wenyi Cheng
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  3. Ruochao Wang
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  4. Jixue Zhou
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  5. Yanfei Chen
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  6. Jinwei Wang
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  7. Yuansheng Yang
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Correspondence to Hongtao Liu .

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Editors and Affiliations

  1. Chinese Materials Research Society, Beijing, China

    Yafang Han

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Liu, H. et al. (2018). Effects of Post-welded Heat Treated on the AZ31B Magnesium Alloy Joint Welded by Automatic TIG Welding. In: Han, Y. (eds) Advances in Materials Processing. CMC 2017. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-0107-0_18

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  • DOI: https://doi.org/10.1007/978-981-13-0107-0_18

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-13-0106-3

  • Online ISBN: 978-981-13-0107-0

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