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点焊接头超声C扫描图像分析及焊核直径测量
孙鑫宇, 曾凯, 张龙
昆明理工大学机电工程学院, 昆明 650500
摘要:
采用超声波扫描显微镜获取了点焊接头C扫描图像,分析点焊接头C扫描图像灰度值的分布特征,提出了一种对焊核边缘、焊核直径进行快速检测分析的方法;对不同焊接工艺参数下的不锈钢点焊接头进行表面检测,对比分析基于C扫描图像的焊点检测结果与实际测量值。结果表明,通过这种测量方法不但可以快速得到焊核边缘及焊核尺寸,而且避免了人为因素的影响;与实际测量结果相对比,两者之间相差较小,证实了该检测方法的可行性。
关键词:  焊核直径  超声波C扫描  灰度值  点焊接头
DOI:10.12044/j.issn.1007-2330.2017.01.016
分类号:TG115.28
基金项目:国家自然科学基金项目(51565022;51565023);昆明理工大学分析测试基金(20150575)
Ultrasonic C-scan Analyses and Nugget Diameter Measuring of Spot Welded Joints
SUN Xinyu, ZENG Kai, ZHANG Long
Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500
Abstract:
The quality of spot welded joints was evaluated by the scanning acoustic microscope (SAM). The change characteristics of gray level of C-scan image were analyzed. The feasibility of evaluating the quality of spot welded joints and measuring the nugget diameter by using the change of the gray level was provided. And we analyzed the spot welded joints of 1.0 mm stainless steel under different welding parameters. The calculated values of nugget diameter are compared with the measured values by macrophotograph of samples. The results show that this method is available for measuring nugget diameter of the spot welded joints, and can avoid the influence of artificial factors and reduce production costs. The accuracy of testing result was verified by contrasting the metallographs of actual spot welded joints cross section.
Key words:  Nugget diameter  Ultrasonic C-scan  Gray level  Spot welded joint