X80管道内表面裂纹的激光超声检测方法与试验

Laser ultrasonic detection method and test for inner surface cracks of X80 pipelines

随着X80管道的大规模应用,长输油气管道长期服役的安全性备受关注。为解决管道内表面裂纹缺陷的检测问题,针对具有非接触、高精度特点的激光超声无损检测方法开展试验研究,并将其应用于X80管道内表面裂纹缺陷检测。通过试验测量获取了X80管道试样无裂纹区域和有裂纹区域的激光超声信号以及激光超声B扫描检测与成像,分析了裂纹缺陷对激光超声信号的影响。结果表明:激光超声B扫描可以有效检测出管道内表面裂纹缺陷并精准定位,具有在管道无损检测领域推广应用的价值。

As X80 pipelines are applied in large scale,the safety of long-term service of long-distance oil and gas pipelines has attracted much attention.In order to solve the problem of detecting the inner surface crack defects of pipelines,experimental research has been conducted for the laser ultrasonic nondestructive detection method characterized by noncontact and high precision,which was also applied to the inner surface crack defect detection of X80 pipelines.The laser ultrasonic signals in the areas of X80 pipeline specimen with/without cracks and the laser ultrasonic based B-scan detection and imaging were obtained through experimental measurement.Meanwhile,the influence of crack defects on laser ultrasonic signal were analyzed.The research results indicate that:the inner surface crack defects of pipelines can be detected and accurately located through the laser ultrasonic based B-scan.Hence,the laser ultrasonic based B-scan is valuable for promotion and application in the nondestructive detection of pipelines.