奥氏体不锈钢焊缝的相控阵超声检测图像融合技术  

PAUT image fusion technology for austenitic stainless steel welds

作　　者：陈智发 纪志淑 CHEN Zhifa;JI Zhishu(Shantou Institute of Ultrasonic Instruments Co.,Ltd.,Shantou 515041,China;Shantou Ultrasonic Testing Technology Co.,Ltd.,Shantou 515041,China)

机构地区：[1]汕头市超声仪器研究所股份有限公司,汕头515041 [2]汕头市超声检测科技有限公司,汕头515041

出　　处：《无损检测》2024年第12期66-70,共5页Nondestructive Testing

摘　　要：针对奥氏体不锈钢焊缝的特点以及相控阵超声检测焊缝相关标准,通常采用纵波检测焊缝内部和底部区域、爬波检测焊缝近表面区域的分组检测方法,检测时各个分组相邻声束之间相互重叠以确保覆盖整个焊缝区域,致使其结果中存在多个分组检测图像,且有时同一个缺陷会出现在多个分组检测图像中,若直接评图,易造成评定结果中出现同一个缺陷多次评定且位置和大小不一致的问题。针对该问题,提出了一种相控阵超声检测图像融合技术,其可以将多个分组检测图像进行融合并进行缺陷位置修正和检测灵敏度归一化。试验结果表明,融合后的超声检测图像中不会重复出现同一个缺陷显示,可避免缺陷多评,有助于提高评图效率和质量。According to the characteristics of austenitic stainless steel welds and the relevant standards of phased array ultrasonic testing for welds,generally longitudinal waves are used for testing inner and bottom areas of welds,and creeping waves are used for testing near-surface areas of welds.The adjacent beams in the groups overlap each other to ensure coverage of the entire weld area,resulting in multiple groups of testing images.With such group testing method,sometimes the same flaw may appear in the testing images of multiple groups,and the same flaw may be assessed multiple times with different locations and sizes in the assessment result in the case of direct image assessment.Specific to such problem,a PAUT(phased array ultrasonic testing)image fusion technology is proposed in this study by means of the fusion of testing images in each group,correction of flaw locations and normalization of testing sensitivity.The ultrasonic images after fusion will not show the same flaws,which avoids the same flaws being assessed multiple times and improves the efficiency and quality of image assessment.

关 键 词：相控阵超声 图像融合 灵敏度归一化 

分 类 号：TG115.28[金属学及工艺—物理冶金]