[1] El Rayes M, Walz C, Sepold G. Welding Journal, 2004, 83(5): 147.
[2] Bagger C, Olsen F O. Journal of Laser Applications, 2005, 1(17): 2.
[4] Li P J, Zhang Y M. IEEE Transactions on Instrumentation and Measurement, 2001, 50(3): 697.
[5] Mirapeixa J, Coboa A, Condea O M, et al. NDT & E International, 2006, 39(5): 356.
[6] Sibillano T, Ancona A, Berardi V, et al. Journal of Materials Processing Technology, 2007, 191(1-3): 364.
[7] Robert Rozman, Igor Grabec, Edvard Govekar. Applied Surface Science, 2008, 254(11): 3295.
[8] Zhang Yi, Chen Genyu, Wei Haiying, et al. Optics and Lasers in Engineering, 2008, 46(2): 133.
[9] Liu L M, Huang R S, Song G. IEEE Transaction on Plasma Science, 2008, 36(4): 1937.
[11] Li J Y, Song Y L. Welding in the World, 1994, 34(9): 317.
[12] Li Z Y, Wang B, Ding J B. Journal of Material Processing Technology, 2009, 209(10): 4867.
[13] Sforza P, De Blasiis D. NDT & E International, 2002, 35(1): 37.
[14] Jean E S, Martin W C. Handbook of Basic Atomic Spectroscopic Data, NIST, 1991, 3(2): 81.