[1] [1] Seiji Katayama, Yousuke Kawahito, Masami Mizutani. Elucidation of laser welding phenomena and factors affecting weld penetration and welding defects[J]. Physics Procedia, 2010, 5: 9-17.

[2] [2] Cui Haichao, Lu Fenggui, Tang Xinhua, et al.. Experimental research on fluidity of laser welded molten pool[J]. Chinese J Lasers, 2011, 38(6): 0603004.

[3] [3] Hu Changkui, Chen Peifeng, Liang Jun. The technics study of laser welding thick plate[J]. Applied Laser, 2003, 23(5): 268-270.

[4] [4] Wu Shikai,Xiao Rongshi, Chen Kai. Laser welding of heavy section stainless steel plants[J]. Chinese J Lasers, 2009, 36(9): 2422-2425.

[5] [5] V S Golubev. Possible hydrodynamic phenomena in deep penetration laser channels[C]. SPIE, 2000, 3888: 244-253.

[6] [6] Zhang Yi. The Simulation Research on the Keyhole Effect of Deep Penetration Laser Welding Based on a Novel “Sandwich” Method[D]. Changsha: Hunan University, 2005.

[7] [7] Pang Shengyong. A Study on the Transient Keyhole and Moving Weld Pool Behaviors and Mechanisms of Deep Penetration Laser Welding[D]. Wuhan: Huazhong University of Science and Technology, 2011.

[8] [8] I Eriksson, J Powell, A F H Kaplan. Measurements of fluid flow inside laser welding keyholes[J]. Join Weld Sci Techn, 2011, 16(7): 636-641.

[9] [9] Torbjrn Ilar, Ingemar Eriksson, John Powell, et al.. Root humping in laser welding-an investigation based on high speed imaging[J]. Physics Procedia, 2012, 39: 27-32.