Inspection of defects in large curvature butt-welded bends with viscoelastic anticorrosive coating based on phased array ultrasonic guided wave scanning

被引：2
作者：
Luo G. [1 ,2 ]
Tan J. [2 ]
机构：
[1] Special Equipment Inspection and Research Institute of Hunan Province, Changsha
[2] School of Mechanical and Electrical Engineering, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 10期
基金：
中国国家自然科学基金;
关键词：
A-scan imaging; B-scan imaging; Defect inspection; Large curvature butt-welded bend with viscoelastic anticorrosive coating; Phased array; Ultrasonic guided wave;
D O I：
10.11817/j.issn.1672-7207.2019.10.007
中图分类号：
学科分类号：
摘要：
In order to solve the problem of inspecting defects in large curvature butt-welded bends with viscoelastic anticorrosive coating by ultrasonic guided wave, the influence of elbow and girth weld on the propagation of L(0, 2) mode and T(0, 1) mode was analyzed with the finite element method. Then, the method of phased array ultrasonic guided wave scanning was proposed. To improve the ability of inspecting defects, the phased array technology was used to control the excitation of L(0, 2) mode and T(0, 1) mode. Meanwhile, A-scan imaging technology and B-scan imaging technology were used to improve the defect identifying ability of L(0, 2) mode and T(0, 1) mode. Finally, five large curvature butt-welded bends with defects were processed, which were commonly used in urban oil and gas pipelines. And the above method was used for the test. The results show that the girth weld causes the reflection of L(0, 2) mode and T(0, 1) mode. Meanwhile, the elbow and girth weld cause the attenuation and the mode conversion of L(0, 2) mode and T(0, 1) mode. The above phenomenon makes it difficult to inspect the defect in elbow of large curvature butt-welded bend with viscoelastic anticorrosive coating, and the defect in the straight pipe after the elbow. The method of phased array ultrasonic guided wave scanning can effectively inspect and locate the defects in elbow and in the straight pipe after the elbow. © 2019, Central South University Press. All right reserved.
引用
收藏
页码：2385 / 2394
页数：9
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