[1] Z. Li, Z. Jing, and Z. Sun, Chin. Opt. Lett. 2, 578 (2004).
[2] H. Zhang, Z. Xiong, J. Jia, and J. Pan, Chin. J. Mech. Engineering (in Chinese) 38, 113 (2002).
[3] Z. Zhu, Research on welding robot recognizing and guiding of the initial welding position with visual method (in Chinese) (Ph.D, Shanghai Jiao Tong University, 2004).
[4] M. G. George, On-line laser ultrasonic sensing for control of robotic welding quality (in Chinese) (Ph.D, Georgia Institute of Technology, 1995).
[5] N. Shibata, A. Hirai, Y. Takano, and Y. Ishimaru, Welding Research Abroad 46, 9 (2000).
[6] S. Chen, Y. Lou, L. Wu, and D. Zhao, Welding Journal 79, 151 (2000).
[7] J.-Y. Yu, and S.-J. Na, Mechatronics 7, 599 (1997).
[8] J. Wang, Visual information acquisition and adaptive control of weld pool dynamics of aluminum alloy during pulsed TiG welding (Ph.D, Shanghai Jiao Tong University, 2003).
