Characteristics of AZ31 Mg alloy joint using automatic TIG welding

Hong-tao Liu; Ji-xue Zhou; Dong-qing Zhao; Yun-teng Liu; Jian-hua Wu; Yuan-sheng Yang; Bai-chang Ma; Hai-hua Zhuang

doi:10.1007/s12613-017-1383-8

Volume 24 Issue 1

Jan. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(1): 102-108

Hong-tao Liu, Ji-xue Zhou, Dong-qing Zhao, Yun-teng Liu, Jian-hua Wu, Yuan-sheng Yang, Bai-chang Ma, and Hai-hua Zhuang, Characteristics of AZ31 Mg alloy joint using automatic TIG welding, Int. J. Miner. Metall. Mater., 24(2017), No. 1, pp. 102-108. https://doi.org/10.1007/s12613-017-1383-8

Cite this article as:

Hong-tao Liu, Ji-xue Zhou, Dong-qing Zhao, Yun-teng Liu, Jian-hua Wu, Yuan-sheng Yang, Bai-chang Ma, and Hai-hua Zhuang, Characteristics of AZ31 Mg alloy joint using automatic TIG welding, Int. J. Miner. Metall. Mater., 24(2017), No. 1, pp. 102-108. https://doi.org/10.1007/s12613-017-1383-8

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Research Article

Characteristics of AZ31 Mg alloy joint using automatic TIG welding

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Corresponding author:
Hong-tao Liu E-mail: hongtaoliu@sdas.org
Received: 2 July 2016; Revised: 12 September 2016; Accepted: 18 September 2016

Abstract

Abstract

The automatic tungsten-inert gas welding (ATIGW) of AZ31 Mg alloys was performed using a six-axis robot. The evolution of the microstructure and texture of the AZ31 auto-welded joints was studied by optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron backscatter diffraction. The ATIGW process resulted in coarse recrystallized grains in the heat affected zone (HAZ) and epitaxial growth of columnar grains in the fusion zone (FZ). Substantial changes of texture between the base material (BM) and the FZ were detected. The {0002} basal plane in the BM was largely parallel to the sheet rolling plane, whereas the c-axis of the crystal lattice in the FZ inclined approximately 25° with respect to the welding direction. The maximum pole density increased from 9.45 in the BM to 12.9 in the FZ. The microhardness distribution, tensile properties, and fracture features of the AZ31 auto-welded joints were also investigated.
- magnesium alloys;
- TIG welding;
- microstructure;
- texture;
- microhardness

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References

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