[1] [1] SONG JIANLI, LI YONGTANG, DENG QILIN, et al.Research Progress of Laser CladdingForming Technology［J］.Journal of Mechanical Engineering, 2010, 46(14): 29-39.

[2] [2] ZHONG Y C, AHN I H, MOON S K.Process monitoring and inspection systems in metal additive manufacturing: status and applications［J］.International Journal of Precision Engineering and Manufacturing-green Technology, 2017, 4(2): 235-245.

[3] [3] PURTONEN T, KALLIOSAARI A, SALMINEN A.Monitoring and adaptive control of laser processes［J］.Physics Procedia, 2014(56): 1218-1231.

[4] [4] TAN HUA, CHEN JING, YANG HAIOU, et al.Real-time sensing and closed-loop control of laser rapid forming process［J］.Applied Laser, 2005, 25(2): 73-76.

[5] [5] ZHOU GUANGCAI, SUN KANGKAI, DENG QILIN.The processing control of laser cladding［J］.2004(2): 39-42.

[6] [6] HOFMAN J T, PATHIRAJ B, DIJK J V, et al.A camera based feedback control strategy for the laser cladding process［J］.Journal of Materials Processing Technology, 2012, 212(11): 2455-2462.

[7] [7] YU DONG, ZHONG MINLIN, LIU WENJIN, et al.Realtime monitoring research of melt pool images in laser cladding process［C］.// The 8th National Conference on Laser Processing.Tsinghua University, 2006: 86-90.

[8] [8] DU QUANYING, WANG WEI, WANG JIANJUN, et al.Image processing of aluminum alloy gas shielded tungsten arc welding weld pool［J］.Journal of Shanghai Jiaotong University, 2005, 39(7): 1055-1057.

[9] [9] LI YUAN, WANG QINGLIN, XU DE, et al.Pipeline welding pool image processing and feature extraction［J］.Transactions of the Chinese Welding Institution.2008, 29(8): 57-60.