CO2空间曲线焊熔池几何尺寸的视觉检测  

Visual Inspection of Molten Pool Geometric Dimension in CO2 Spatial Curve Welding

作　　者：刘晓刚[1,2] 闫红方 张荣 陈志锋 LIU Xiaogang;YAN Hongfang;ZHANG Rong;CHEN Zhifeng(School of Mechanical Engineering,Guangxi University of Science and Technology,Liuzhou 545000,China;School of Mechanical Engineering,Guilin University of Aerospace Technology,Guilin 541000,China)

机构地区：[1]广西科技大学机械工程学院,广西柳州545000 [2]桂林航天工业学院机械工程学院,广西桂林541000

出　　处：《热加工工艺》2020年第1期138-141,147,共5页Hot Working Technology

基　　金：广西自然科学基金资助项目(2014GXNSFAA118310).

摘　　要：实现焊接质量的在线控制需要对决定焊接质量的特征进行实时和精准的提取。熔池正面的几何形状尺寸可以反映出焊接质量的好坏,提出一种提取熔池正面几何形状尺寸的方法。首先通过相机标定求出相机的内部参数,为像素点到空间点的映射关系的建立提供基础数据,推导并建立像素点到空间点的映射数学模型。运用图像处理的知识提取出决定熔池几何尺寸的像素点,根据映射关系求出熔宽和熔池半长的真实尺寸。采用不同的焊接工艺参数进行焊接验证,结果表明该方法可以提取出熔宽和熔池半长的尺寸。It is necessary to extract the traits precisely and in real time which decides the on-line control of the welding quality.The geometric shape and size of the front of the molten pool could reflect the quality of welding.A method of extracting the geometric shape and size of the front of the molten pool was proposed.Firstly,the internal parameters of the camera were obtained by camera calibration,which supplied the basic data for building the mapping relationship between the pixel dots and the spatial points,and the mapping mathematical model was established and deduced.According to the knowledge of image processing,the pixel dots were extracted,and the geometric dimensions of molten pool were decided according to the mapping relation,the real size of weld width and half length of the molten pool could be worked out.Weld verification was carried out by adopting different welding parameters,and the result shows that the method can extract the size of weld width and half length of the molten pool.

关 键 词：相机标定 像素点 映射关系 几何尺寸 

分 类 号：TG441.7[金属学及工艺—焊接] TP391.41[自动化与计算机技术—计算机应用技术]