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基于网格激光线的横向焊接焊缝下塌检测方法
王齐胜, 高延峰
南昌航空大学, 南昌 330063
摘要:
提出了一种基于网格激光的横向焊接焊缝下塌检测方法,根据5×5网格激光投影在焊缝表面的变形来检测焊缝的下塌情况.首先对网格图像进行处理,分别得到竖向和横向的像素点集.在此基础上,利用高斯函数对竖向点集进行样条曲线拟合,再对获得的高斯样条曲线分四段进行拟合,并求曲线段和直线段的交点.采用基于横向线的最小二乘法,对获得的交点以及焊缝最高点进行直线拟合.最后,通过计算三条拟合直线的距离,得到焊缝的下塌量.结果表明,该方法可以实现横向焊缝下塌情况的在线检测,为横向焊接焊缝成形闭环控制提供了基础.
关键词:  横向焊接  焊缝下塌  网格激光  图像检测
DOI:10.12073/j.hjxb.2019400184
分类号:TG409
基金项目:国家自然科学基金资助项目(51465043)
Detection of horizontal weld seam collapse based on grid laser lines
WANG Qisheng, GAO Yanfeng
Nanchang Hangkong University, Nanchang 330063, China
Abstract:
A method for the online detection of horizontal weld seam collapse was proposed, in which the weld seam collapse was detected according to the deformation of the 5×5 grid laser lines projected on the surface of the weld seam. Firstly, the images of the grid lines were processed and the vertical and horizontal pixel points were obtained. Then the vertical pixel points were fitted into five spline curves based on Gaussian function. Each of these spline curves was fitted into four segments, and the intersection points of the curve segment with the straight segment was obtained. The intersection points and the highest points on the five vertical spline curves were fitted into three straight horizontal lines based on a least square method. Finally, the collapse of weld seam was obtained by calculating the distances between the three straight horizontal lines. The experimental results show that this method realizes the online detection of horizontal weld seam collapse. This work is expected to provide the foundation for closed-loop control of horizontal weld seam formation.
Key words:  horizontal weld  weld seam collapse  grid laser  image detection