激光紧密对接焊磁光成像焊缝识别  

Weld detection of tight butt joint laser welding using magneto-optical imaging

作　　者：莫玲[1] 高向东[1] 萧振林 陈晓辉 李秀忠[3] 

机构地区：[1]广东工业大学机电工程学院,广东广州510006 [2]广州番禺高勋染整设备制造有限公司,广东番禺511400 [3]佛山职业技术学院,广东佛山528137

出　　处：《焊接技术》2016年第5期30-33,7,共4页Welding Technology

基　　金：国家自然科学基金资助项目(51175095);广东省协同创新与平台环境建设专项资金项目(503149102077);广东省重大科技专项(2014B090921008);广州市科学研究专项(1563000554);佛山市科技创新专项资金项目(2014AG10015)

摘　　要：准确检测焊缝中心位置是保证焊缝自动跟踪的前提。针对激光焊接碳钢紧密对接焊缝(间隙不大于0.1 mm),利用磁光传感系统获取焊缝磁光图像,分析焊缝磁光图像的灰度分布特征,对磁光图像进行中值滤波去噪,通过逐列扫描磁光图像灰度梯度极大值后拟合焊缝中心位置。焊缝位置检测试验结果表明,基于焊缝磁光图像灰度梯度特征的焊缝中心拟合法优于直接边缘检测算子;所提出的方法能够识别微间隙焊缝中心位置,为实时控制激光束跟踪紧密对接焊缝奠定了基础。Accurately weld detection was a prerequisite for automatic seam tracking. A magneto-optical imaging system was used to extract the tight butt joint( gap width less than 0.1 mm) position of low-carbon steel. The gray scale distribution characteristic of weld using magneto-optical images was analyzed, and the noises were diminished by using the median filtering. To detect the weld center position, the gray gradient distribution was scanned column by column, and the coordinates of rows corresponding to the maximum gray gradient value were defined as the weld position, then it could be obtained by the fitting accurately. Experimental results showed that the magneto-optical imaging method could extract the tight butt joint position more accurately than the extraction of weld by edge detection algorithm directly. The tight butt joint could be detected by the proposed method accurately, which provided a foundation for the real-time seam tracking of laser welding.

关 键 词：磁光成像 紧密对接焊缝 识别 

分 类 号：TG456.7[金属学及工艺—焊接] TP273.5[自动化与计算机技术—检测技术与自动化装置]