A Seam Measurement Method based on Micro Depth of Field for Laser Welding

摘要：

　　For the seam feature measurement of the tight butt joint without misalignment in laser welding,current vision sensor cannot obtain the seam gap width and seam position stably and reliably.In this paper,a seam measurement method based on the micro depth of field is proposed.A four times optical magnification lens,a CCD/CMOS camera and an extemal LED lighting unit are used to constitute the measure system,which can be used for the tight butt joint for laser welding.Experiment indicated that it can obtain the seam gap width and seam position stably and correctly.With the method,seam surface normal vector also can be measured.The measurement accuracy for the seam gap width and seam position is 5 μm and 6 μm,respectively.Furthermore,the narrowest welding seam gap that can be measured by this method is 0.02 mm,which is fully satisfied the demand of the seam measurement in laser welding.

关键词： Laser welding Butt joint Vision sensor Micro depth of field Definition

作者: Pingjiang Wang Yating Huang Fangyu Peng Jiangfei Qi Bin Li

作者单位: National Numerical Control System Engineering Research Center, Huazhong University of Scienceand Technology, Wuhan,Hubei, 430074, China

会议类型: 国际会议

会议名称: the Second International Conference on Frontiers of Manufacturing and Design Science(第二届制造与设计科学国际会议(ICFMD 2011))

会议地点: 台湾

会议语种:英文

页码: 3107-3112

在线出版日期: 2011-12-11（万方平台首次上网日期，不代表论文的发表时间）