[1] [1] Alaa Elwany, Gustavo Tapia. A review on process monitoring and control in metal-based additive manufacturing [J]. Manufacturing Science and Engineering, 2014, 136(6): 1-10.

[2] [2] Shi Qimin, Gu Dongdong, Xia Mujian, et al. Effects of laser processing parameters on thermal behavior and melting/solidification mechanism during selective laser melting of Tic/Inconel718 composites [J]. Optics & Laser Technology, 2016, 84: 9-22.

[3] [3] Zhong Chongliang, Andres Gasser, Jochen Kittel, et al. Improvement of material performance of Inconel718 formed by high deposition-rate laser metal deposition [J]. Material and Design, 2016, 98: 128-134.

[4] [4] Yu Jun, Lin Xin, Chen Junjie, et al. Mechanics and energy analysis on molten pool spreading during laser solid forming [J]. Applied Surface Science, 2010, 256: 4612-4620.

[5] [5] Jiang Shujuan, Liu Weijun, Xiang Fei. Research on measuring and control system of metal powder laser shaping [C]//International Conference on Mechatronics and Automation, 2006: 1717-1721.

[6] [6] Han Lijun, Liou F W, Srinvas Musti. Thermal behavior and geometry model of melt pool in laser material process[J]. Department of Mechanical and Aerospace, 2005, 127: 1005-1014.

[7] [7] Ravi G A, Hao X J, Wain N, et al. Direct laser fabrication of three dimensional components using SC420 stainless steel [J]. Materials and Design, 2013, 47: 731-736.

[8] [8] Amitava De, Tarasankar Debroy. Heat transfer and material flow during laser assisted multi-layer additive manufacturing [J]. Journal of Applied Physics, 2014, 116(116): 124905.

[9] [9] Lie Tang, Robert G. Melt pool temperature control for laser matal depisition processes-Part1: Online temperature control [J]. Journal of Manufacturing Science and Engineering, 2010, 132: 0110101-0110109.

[10] [10] Qiu Chunlei, Ravi G A, Chris Dance, et al. Fabrication of large Ti-6Al-4V structures by direct laser deposition [J]. Journal of Alloys and Compounds, 2015, 692: 351-361.

[11] [11] Parisa Farahmand, Liu Shuang, Zheng Zhe, et al. Laser cladding assisted by induction heating of Ni–WC composite enhanced by nano-WC and La2O3[J]. Ceramics International, 2014, 40(10): 15421-15438.

[12] [12] Tan Hua, Chen Jing, Lin Xin, et al. Process analysis for laser solid forming of thin-wall structure [J]. International Journal of Machine Tools & Manufacture, 2010, 50(1): 1-8.

[14] [14] Song Lijun, Vijayavel Bagavath-Singh, Bhaskar Dutta, et al. Control of melt pool temperature and deposition height during direct metal deposition process [J]. Int J Adv Manuf Technol, 2012, 58(1): 247-256.

[15] [15] Tabernero I, Lamikiz A, Martínez S, et al. Geometric modelling of added layers by coaxial laser cladding [J]. Physics Procedia, 2012, 39: 913-920.

[16] [16] Ding Yaoyu, James Warton, Radovan Kovacevic. Development of sensing and control system for robotized laser-based direct metal addition system [J]. Additive Manufacturing, 2016, 10: 24-35.

[17] [17] Peng Dingcong. Basic principle and application of Kalman filter [J]. Software Guide, 2009, 8(11): 32-35. (in Chinese)

[18] [18] Liu Jichang, Li Lijun. Effects of process variables on laser direct formation of thin wall [J]. Science Direct, 2007, 39: 231-236.

[19] [19] Onwubolu G C, Davim J P, Carlos Oliveira, et al. Prediction of clad angle in laser cladding by powder using response surface methodology and scatter search[J]. Optics & Laser Technology, 2007, 39: 1130-1134.