[1] [1] M Marya, G R Edwards, S Liu. An investigation on the effects of gases in GTA welding of a wrought AZ80 magnesium alloy［J］. Welding Journal, 2004, 83(7): 203-212.

[2] [2] Zhang Zhaodong, Liu Liming, Wang Lai. Microstructure feature analysis of activating TIG welded joints［J］. Transactions of the China Welding Institution, 2004, 25(4): 55-58.

[3] [3] Tianping Zhu, Zhan W Chen, Wei Gao. Microstructure formation in partially melted zone during gas tungsten arc welding of AZ91 Mg cast alloy［J］. Materials Characterization, 2008, 59(11): 1550-1558.

[4] [4] 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[J]. Metallurgical and Materials Transactions A, 2004, 35(8): 2455-2469.

[5] [5] A Munitz, C Cotler, A Stem, et al.. Mechanical properties and microstructure of gas tungsten arc welded magnesium AZ91D plates［J］. Materials Science and Engineering A, 2001, 302(1): 68-73.

[6] [6] G Padmanaban, V Balasubramanian. Effects of laser beam welding parameters on mechanical properties and microstructure of AZ31B magnesium alloy［J］. Transactions of Nonferrous Metals Society of China, 2011, 21(9): 1917-1924.

[7] [7] Tan Caiwang, Li Liqun, Chen Yanbin, et al.. Characteristics of fiber laser and CO2 laser welding of AZ31B magnesium alloys［J］. Chinese J Lasers, 2011, 38(6): 0603015.

[8] [8] Wei Chengcheng, Huang Jian, Dai Jun, et al.. Analysis of laser-welded joint of dissimilar magnesium alloys AZ31 and NZ30K［J］. Chinese J Lasers, 2011, 38(12): 1203002.

[9] [9] Chun-Ming Lin, Hsien-Lung Tsai, Chang-Lin Lee, et al.. Evolution of microstructures and properties of magnesium alloy weldments produced with CO2 laser process[J]. Materials Science and Engineering A, 2012, 548: 12-18.

[10] [10] Liu Jun, Dong Junhui, Shinozaki K. Microstructure characteristics of fiber laser welding for AZ91D Mg alloy［J］. Rare Metal Materials and Engineering, 2009, 38(s3): 202-204.

[11] [11] Shan Jiguo, Zhang Jing, Zheng Shiqing, et al.. Experimental study on the reason of pore formation in laser welding of die-cast magnesium alloy［J］. Acta Metallurgica Sinica, 2009, 45(8): 1006-1012.

[12] [12] M Marya, G R Edwards. Influence of laser beam variables on AZ91D weld fusion zone microstructure［J］. Science and Technology of Welding and Joining, 2002, 7(5): 286-293.

[13] [13] Zhang Jing, Shan Jiguo, Wen Peng, et al.. Formation regularity of pores during laser welding of die-cast magnesium alloys and its mechanism［J］. Chinese J Lasers, 2011, 38(6): 0603006.

[14] [14] K Zeng, T Klassen, W Oelerich, et al.. Critical assessment and thermodynamic modeling of the Mg-H system［J］. Int J Hydrogen Energ, 1999, 24(10): 989-1004.

[15] [15] Wang Xiangjie, You Guoqiang, Zhang Juncheng, et al.. Study on hereditary of pores in laser remelting of die casting AZ91D magnesium alloy［J］. Acta Metallurgical Sinica, 2012, 48(12): 1437-1445.

[16] [16] Zuo Tiechuan. The Laser Welding of High Strength Aluminum Alloys［M］. Beijing: National Defense Industry Press, 2002. 27-28.