Characteristics of AZ31 Mg alloy joint using automatic TIG welding

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

作者机构：Shandong Key Laboratory for High Strength Lightweight Metallic MaterialsAdvanced Materials InstituteShandong Academy of SciencesJinan 250014China Shandong Engineering Research Center for Lightweight Automobiles Magnesium AlloysAdvanced Materials InstituteShandong Academy of SciencesJinan 250014China Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2017年第24卷第1期

页      面：102-108页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 080202[工学-机械电子工程] 0806[工学-冶金工程] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0703[理学-化学] 080201[工学-机械制造及其自动化] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Key Research and Development Plan of China(Grant Nos.2016YFB0701200 and 2016YFB0301105) the Natural Science Foundation of Shandong Province,China(Grant Nos.ZR2015EQ019,BS2015CL016,and ZR2015YL007) the Youth Foundation of Shandong Academy of Sciences,China(Grant No.2016QN015) 

主　　题：magnesium alloys TIG welding microstructure texture microhardness 

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.