CO_2焊熔池附近区域图像灰度值与瞬时电流的关系研究  

Study on Relationship between Gray Value of Image near Weld Pool and Instantaneous Current in CO_2 Welding

作　　者：刘晓刚[1,2] 黄诗[1] 刘天元[1] 

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,广西桂林541000

出　　处：《热加工工艺》2017年第11期188-191,共4页Hot Working Technology

基　　金：广西自然科学基金资助项目(2014GXNSFAA118310)

摘　　要：CO_2焊熔滴过渡过程中熔池附近区域光照强度变化剧烈,严重影响焊缝特征提取的实时性和可靠性,致使基于视觉的CO_2焊焊缝跟踪技术的应用和发展受到了严重制约。本文采用最小二乘法拟合了CO_2焊焊接过程中熔池附近区域的图像灰度值与瞬时电流的曲线,并分析了二者之间的相对变化关系。结果表明:在短路阶段,随着瞬时电流的增大,图像平均灰度值逐渐减小;在开路阶段,瞬时电流大于62.9296 A时,随着瞬时电流的减小,图像的平均灰度值减小;当瞬时电流在20.4895~62.9296 A时,随着瞬时电流的减小,图像的平均灰度值增大;当瞬时电流小于20.4895 A时,随着瞬时电流的减小,图像的平均灰度值减小。The light intensity at the area near the weld pool during droplet transfer process in CO2 welding changes dramatically, which seriously affects the real-time performance and reliability of weld feature extraction. The application and development of welding seam tracking technology based on vision in CO2 welding is severely restricted. The least square method was used to fit the curve of image gray value near the weld pool with instantaneous current in CO2 welding, and the relative change between the two factors was analyzed. The results show that the average gray value of image in the short circuit stage decreases gradually with the increase of instantaneous current. In the open circuit stage, when the instantaneous current is bigger than 62.9296 A, the average gray value of image reduces with the decrease of instantaneous current; when the instantaneous current is in 20.4895-62.9296 A, the average gray value of image increases with the decrease of instantaneous current; when the current is less than 20.4895A, the average gray value of image reduces with the decrease of instantaneous current.

关 键 词：CO2焊 机器视觉图像采集系统 灰度值 瞬时电流 

分 类 号：TG409[金属学及工艺—焊接]