高强钢点焊的压痕特征图像识别及其与焊点质量关系分析  

Imprint characteristics extracted from images in resistance spot welding of high strength steels and relationship with welding quality

作　　者：张旭强[1] 于志浩 ZHANG Xuqiang;YU Zhihao(School of Mechanical Engineering,Petroleum University of China,Qingdao,266580,China)

机构地区：[1]中国石油大学(华东),青岛266580

出　　处：《焊接学报》2021年第10期62-66,72,I0005,共7页Transactions of The China Welding Institution

基　　金：山东省自然科学基金资助项目(ZR2013EEM033)。

摘　　要：高强钢以其优良的性能广泛应用于工业生产,但在点焊过程中,高强钢的点焊特征难以提取,评价焊点质量较为困难.电极压痕是焊点表面形貌与电极端面的直接反映,压痕图像中同时包含着焊点与电极磨损信息.通过图像处理与识别的方法对压痕进行轮廓边缘检测与识别,采用椭圆拟合的方法提取压痕特征参数.对压痕特征参数与焊点熔核直径进行分析,研究各个特征对焊点质量的影响.结果表明,椭圆拟合的压痕轮廓能够近似代替实际轮廓,压痕特征中提取的平均轴长和点蚀面积与焊点质量之间呈显著的负相关性.High strength steel is widely used in industrial production because of its excellent properties. However, it is difficult to extract the welding characteristics of high strength steel and evaluate the quality of resistance spot welding.Electrode imprint is a direct reflection of the surface morphology of the spot welding and the end face of the electrode. Imprint image contains both spot welding information and electrode wear information. Through image processing and recognition, the contour edge of imprint image is detected and recognized, and the imprint characteristics parameters are extracted by ellipse fitting method. The imprint characteristic parameters and nugget diameter were analyzed,and the influence of each characteristic on spot welding quality was studied. The results show that the imprint contour fitted by ellipse can approximately replace the actual contour. There is a significant negative correlation between the average axial length and pitting area extracted from imprint characteristics and spot weld quality.

关 键 词：焊点质量 边缘检测 图像处理 电极压痕 

分 类 号：TG455[金属学及工艺—焊接]