[1] Jin Xiaoshu, Yang Xichen, Feng Liwei, et al.. Numerical simulation of coaxial powder flow with carrying gas in laser manufacturing [J]. Journal of Mechanical Engineering, 2007, 43(5): 161-166.

[2] Wang Wei, Cai Lei, Yang Guang, et al.. Research on the coaxial powder feeding nozzle for laser cladding [J]. Chinese J Lasers, 2012, 39(4): 0403003.

[3] Guijun Bi, Bert Schürmann, Andres Gasser, et al.. Development and qualification of a novel laser- cladding head with integrated sensors [J]. International Journal of Machine Tools & Manufacture, 2007, 47(3): 555-561.

[4] Yang Nan, Yang Xichen. Numerical simulation of flow field of nozzle in laser cladding [J]. Chinese J Lasers, 2008, 35(3): 452-455.

[5] Liu Jichang, Li Lijun. Effects of powder concentration distribution on fabrication of thin- wall parts in coaxial laser cladding [J]. Optics & Laser Technology, 2005, 37 (4): 287-292.

[6] Jehnming Lin. Concentration mode of the powder stream in coaxial laser cladding [J]. Optics & Laser Technology, 1999, 31 (1): 251-257.

[7] Yang Xichen, Zhang Haiming, Liu Lifeng, et al.. Machine vision in laser remufacturing robot [J]. Chinese J Lasers, 2011, 38(6): 0601008.

[8] He Jinjiang, Zhong Minlin, Liu Wenjin, et al.. Observation and analysis on behaviors of powder stream concentration and molten pool in laser deposition process in controlled environment chamber [J]. Chinese J Lasers, 2006, 33(2): 283-288.