摘要
激光精密焊接技术在焊点的精确定位以及焊接缺陷的实时检测方面还存在一些有待解决的问题。激光焊接过程会产生大量的等离子体,严重影响机器视觉系统的成像质量。试验证明,通过给机器视觉系统添加同轴辅助照明光源可实时获得清晰的熔池图像。在理想状态下,激光焊接的熔池形状应为圆形,根据这一特点设计了速度较快且准确度高的矩阵法进行熔池边缘的快速检测。利用圆拟合的方法在获得熔池中心坐标和半径的同时,还可进行边缘缺陷的实时检测。
Although lasers are widely used for welding in precision engineering industry,it is still a challenge to achieve high accuracy in positioning welding spots with real-time defect detection.To obtain molten pool images without being disturbed by plasma radiation,a machine vision with coaxial auxiliary illuminant system was adopted.Under ideal conditions,the molten pool contour is a regular circle,and a new matrix algorithm can detect this contour quickly.The central position and radius of molten pool can be obtained with the utilization of circle fitting algorithm,and the edge defect can be detected at the same time.
出处
《应用激光》
CSCD
北大核心
2014年第3期228-232,共5页
Applied Laser
基金
天津市应用基础及前沿技术研究计划资助项目(项目编号:12JCQNJC02800)
天津职业技术师范大学科技发展资助项目(项目编号:KTY12-03)
关键词
激光技术
机器视觉
矩阵法
圆拟合
laser technology
machine vision
matrix algorithm
circle fitting
