| Characteristics of AZ31 Mg alloy joint using automatic TIG welding |
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| 作者姓名： | Hong-tao Liu Ji-xue Zhou Dong-qing Zhao Yun-teng Liu Jian-hua Wu Yuan-sheng Yang Bai-chang Ma Hai-hua Zhuang |
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| 作者单位： | Shandong Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Shandong Academy of Sciences, Jinan 250014, China |
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| 基金项目： | the National Key Research and Development Plan of China(Grant ,2016YFB0701200 and 2016YFB0301105);the Natural Science Foundation of Shandong Province, China;the Youth Foun-dation of Shandong Academy of Sciences, China |
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| 摘 要： | 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.
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| 关 键 词： | magnesium alloys TIG welding microstructure texture microhardness |
Characteristics of AZ31 Mg alloy joint using automatic TIG welding |
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| Hong-tao Liu,Ji-xue Zhou,Dong-qing Zhao,Yun-teng Liu,Jian-hua Wu,Yuan-sheng Yang,Bai-chang Ma,Hai-hua Zhuang.Characteristics of AZ31 Mg alloy joint using automatic TIG welding[J].International Journal of Minerals,Metallurgy and Materials,2017,24(1):102-108. |
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| Authors: | Hong-tao Liu Ji-xue Zhou Dong-qing Zhao Yun-teng Liu Jian-hua Wu Yuan-sheng Yang Bai-chang Ma Hai-hua Zhuang |
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| Institution: | 1. Shandong Key Laboratory for High Strength Lightweight Metalic Materials, Advanced Materials Institute, Shandong Academy of Sciences, Jinan 250014, China;2. Shandong Engineering Research Center for Lightweight Automobiles Magnesium Aloys, Advanced Materials Institute, Shandong Academy of Sciences, Jinan 250014, China |
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| 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, ener-gy-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 thec-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. |
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| Keywords: | magnesium alloys TIG welding microstructure texture microhardness |
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