基于图像线性化处理的超声TOFD检测缺陷定位方法  

Defect Localization Image of Ultrasonic TOFD Testing Based on the Linearization

作　　者：盛朝阳[1] 刚铁[1] 黄江中[1,2] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001 [2]海洋石油工程股份有限公司,天津300452

出　　处：《无损检测》2011年第7期15-17,20,共4页Nondestructive Testing

基　　金：国家自然科学基金资助项目(50775054);国际合作基金资助项目(2007DFR70070)

摘　　要：超声TOFD检测方法在厚大焊缝的检测中具有较强的优势,特别是对裂纹类的缺陷,其检出效率高。为满足工程现场检测的需要,开发了基于USB接口的便携式超声TOFD检测系统,利用该系统对含有不同尺寸的人工底面开口窄槽的铝合金试块进行了D扫描检测。同时利用提出的自动算法提取了焊缝区域并将该区域的图像进行了转换,解决了D扫描图像在纵向方向上的显示与焊件厚度之间非线性的关系。结果表明,处理后的图像便于缺陷深度测量,检测人员可根据线性关系直接估算出缺陷的深度和高度,提高了检测效率。Ultrasonic TOFD method has advantages on weld defects testing for thick workpiece, especially highefficiency on crack defects detection. In this paper a USB based pocket-type testing system that combines the software part with the scan equipment was designed. It was applied to test the aluminium alloy specimen which contained different depth of defects. Furthermore, the presented algorithm could be used to automatically recognize the weld zone and linearize the depth of image instead of the original testing image. The result showed that the processed image was more convenient for defect localization by the linearized algorithm of the depth, and the testing efficiency was increased.

关 键 词：TOFD检测 焊缝 缺陷定位 图像线性化 

分 类 号：TG115.28[金属学及工艺—物理冶金]