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

  • Hongtao Liu
  • Wenyi Cheng
  • Ruochao Wang
  • Jixue Zhou
  • Yanfei Chen
  • Jinwei Wang
  • Yuansheng Yang
Conference paper
First Online:
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

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.

Keywords

Automatic TIG welding AZ31B magnesium alloy Post-welded heat treated (PWHT) Microstructure β-Mg17Al12 precipitates Mechanical properties 
This is a preview of subscription content, log in to check access.

Notes

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).

References

  1. 1.
    T.M. Pollock, Weight loss with magnesium alloys. Science 328, 986–987 (2010)CrossRefGoogle Scholar
  2. 2.
    M.K. Kulekci, Magnesium and its alloys applications in automotive industry. Int. J. Adv. Manuf. Technol. 39, 851–865 (2008)CrossRefGoogle Scholar
  3. 3.
    H. Hu, A. Yu, N. Li, J.E. Allison, Potential magnesium alloys for high temperature die cast automotive applications: a review. Mater. Manuf. Processes 18, 687–717 (2003)CrossRefGoogle Scholar
  4. 4.
    H.T. Liu, J.X. Zhou, D.Q. Zhao, Y.T. Liu, J.H. Wu, Y.S. Yang, B.C. Ma, H.H. Zhuang, Characteristics of AZ31 Mg alloy joint using automatic TIG welding. Int. J. Miner. Metall. Mater. 24, 102–108 (2017)CrossRefGoogle Scholar
  5. 5.
    H.T. Liu, R.C. Wang, Q. Liu, J.X. Zhou, Y.F. Chen, B.C. Ma, Y.S. Yang, Microstructure characterization of AZ31B Mg Alloy Welds Processed by Nd:YAG Laser Welding. Mater. Sci. Forum 898, 1051–1055 (2017)CrossRefGoogle Scholar
  6. 6.
    M. Gao, S. Mei, Z. Wang, X. Li, X. Zeng, Process and joint characterizations of laser-MIG hybrid welding of AZ31 magnesium alloy. J. Mater. Process. Technol. 212, 1338–1346 (2012)CrossRefGoogle Scholar
  7. 7.
    S. Mironov, T. Onuma, Y.S. Sato, H. Kokawa, Microstructure evolution during friction-stir welding of AZ31 magnesium alloy. Acta Mater. 100, 301–312 (2015)CrossRefGoogle Scholar
  8. 8.
    K.N. Braszczyńska-Malik, M. Mróz, Gas-tungsten arc welding of AZ91 magnesium alloy. J. Alloys Compd. 509, 9951–9958 (2011)CrossRefGoogle Scholar
  9. 9.
    Z. Sun, D. Pan, J. Wei, Comparative evaluation of tungsten inert gas and laser welding of AZ31 magnesium alloy. Sci. Technol. Weld. Joining 7, 343–351 (2002)CrossRefGoogle Scholar
  10. 10.
    S. Niknejad, L. Liu, T. Nguyen, M.-Y. Lee, S. Esmaeili, N. Zhou, Effects of Heat Treatment on Grain-Boundary β-Mg17Al12 and Fracture Properties of Resistance Spot-Welded AZ80 Mg Alloy. Metall. Mater. Trans. A 44, 3747–3756 (2013)CrossRefGoogle Scholar
  11. 11.
    G. Wang, Z. Yan, H. Zhang, X. Zhang, F. Liu, X. Wang, Y. Su, Improved properties of friction stir-welded AZ31 magnesium alloy by post-weld heat treatment. Mate. Sci. Technol. 33, 854–863 (2017)CrossRefGoogle Scholar
  12. 12.
    S.H. Wu, J.C. Huang, Y.N. Wang, Evolution of microstructure and texture in Mg-Al-Zn alloys during electron-beam and gas tungsten arc welding. Metall. Mater. Trans. A 35, 2455–2469 (2004)CrossRefGoogle Scholar
  13. 13.
    M. Gao, H.G. Tang, X.F. Chen, X.Y. Zeng, High power fiber laser arc hybrid welding of AZ31B magnesium alloy. Mater. Des. 42, 46–54 (2012)CrossRefGoogle Scholar
  14. 14.
    T. Zhu, Z.W. Chen, W. Gao, Microstructure formation in partially melted zone during gas tungsten arc welding of AZ91 Mg cast alloy. Mater. Charact. 59, 1550–1558 (2008)CrossRefGoogle Scholar
  15. 15.
    S. Celotto, TEM study of continuous precipitation in Mg-9 wt%Al-1 wt%Zn alloy. Acta Mater. 48, 1775–1787 (2000)CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Hongtao Liu
    • 1
  • Wenyi Cheng
    • 2
  • Ruochao Wang
    • 3
  • Jixue Zhou
    • 1
  • Yanfei Chen
    • 4
  • Jinwei Wang
    • 1
  • Yuansheng Yang
    • 5
  1. 1.Shandong Key Laboratory for High Strength Lightweight Metallic MaterialsAdvanced Materials Institute, Shandong Academy of SciencesJinanChina
  2. 2.Shandong Urban Construction Vocational CollegeJinanChina
  3. 3.Shandong Institute of Commerce and TechnologyJinanChina
  4. 4.Shandong Engineering Research Center for Lightweight Automobiles Magnesium Alloys, Advanced Materials Institute, Shandong Academy of SciencesJinanChina
  5. 5.Institute of Metal Research, Chinese Academy of SciencesShenyangChina

Personalised recommendations