(a. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals； b. Key Laboratory of Nonferrous Metal Alloys of Ministry of Education, Lanzhou University of Technology， Lanzhou 730050， China)
Abstract： To measure the highly dynamic and irregular mirror surface of the welding pool, the mathematical model for reconstructing the TIG welding threedimensional surface was proposed based on the existing algorithm. To reconstruct the threedimensional surface of different convex and concave using the new algorithm, lasers were reflected by different three-dimensional surface reforming different lasers dots matrix distribution on the imaging screen. The Matlab software was used to compile the corresponding procedures for the visualization of the welding pool. The result shows that mathematical model can better reflect the level of the welding pool surface successfully by relying on the lasers dots matrix distribution on the imaging screen, but in order to improve the reconstruction accuracy, more constraints should be applied.
Key words：
［1］王志江，张广军，张裕明，等. 非熔化极气体保护焊熔池表面形貌三维传感及其装置设计［J］. 机械工程学报，2008，44(10)：300303.WANG Zhijiang, ZHANG Guangjun, ZHANG Yuming, et al. 3D sensing of gas tungsten arc weld pool surface and sensing device design ［J］. Chinese Journal of Mechanical Engineering，2008，44(10)：300303.［2］Zhang Song, Huang Peisen S. Highresolution, realtime threedimensional shape measurement ［J］. Optical Engineering，2006, 45(12)：(123601)1(123601)8.［3］Zhang Song. Recent progresses on realtime 3D shape measurement using digital fringe projection techniques ［J］. Optics and Lasers in Engineering, 2010，48(2)：149158.［4］高向东，杨永辉，张艳喜. 激光焊熔池图像三维形态恢复算法分析［J］. 焊接学报，2013，34(11)：58.GAO Xiangdong, YANG Yonghui, ZHANG Yanxi. Analysis of 3D reconstruction algorithm of laser welding molten pool image ［J］. Transactions of the China Welding Institution，2013，34(11)：58.［5］Song H S，Zhang Y M. Measurement and analysis of threedimensional specular gas tungsten arc weld pool surface ［J］. Welding Journal，2008(87)：85s 95s.［6］Wang Zhenzhou, Yang Ruigang, Zhang Yuming. Analytic measurement of mirror surfaces by a single shot with united modeling of incident rays ［J］. Measurement Science and Technology，2012(23)：(125404)1 (125404)13.［7］Zhang Weijie, Wang Xuewu, Zhang Yuming. Analytical realtime measurement of a threedimensional weld pool surface ［J］. Measurement Science and Technology，2013(24)：(115011)1(115011)18.
