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Start Over Author "Zhou, Jixue" Publisher springer science and business media llc
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6. Characteristics of AZ31 Mg alloy joint using automatic TIG welding

Author

Yuansheng Yang, Jian-hua Wu, Dongqing Zhao, Zhou Jixue, Zhuang Haihua, Yun-teng Liu, Liu Hongtao, and Baichang Ma

Subjects
Heat-affected zone, Materials science, Scanning electron microscope, Mechanical Engineering, Gas tungsten arc welding, Metallurgy, Metals and Alloys, 02 engineering and technology, Welding, 021001 nanoscience & nanotechnology, Microstructure, 020501 mining & metallurgy, law.invention, 0205 materials engineering, Optical microscope, Geochemistry and Petrology, Mechanics of Materials, law, Materials Chemistry, Texture (crystalline), 0210 nano-technology, Electron backscatter diffraction
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.

Published
2017

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