天然气与石油2017，Vol.35Issue(3)：1-5,5.DOI:10.3969/j.issn.1006-5539.2017.03.001
基于衍射横波的焊缝近表面缺陷TOFD检测方法
TOFD for Weld Joints Near-Surface Defect Detection Based on Diffraction Shear Wave
张涛1
作者信息
- 1. 中国石油工程建设有限公司, 北京 100120
- 折叠
摘要
Abstract
Conventional TOFD technique uses the longitudinal diffracted wave to locate and size the flaw. However, owing to the superposition of the lateral wave and the deviation between the welding and the axis of main acoustic beam, there is an insensitive region near the surface, resulting in missing inspection. In order to solve the problem above, an analytic method named as S-wave TOFD is presented based on shear wave diffracted from defect tips. The characteristic of sound propagation in S-wave TOFD method, the detection principle and the method of quantitative calculation are illustrated in detail. Through the experiments of artificial defects detecting, the result shows that the S-wave TOFD method can significantly improve the detection sensitivity and precision for the shallow buried defects for that it can effectively identify the near surface defect with buried depth of about 2 mm and the calculated error of the height and buried depth of defect is less than ± 1 mm.关键词
超声检测TOFD/衍射横波/缺陷检测/定量计算Key words
Ultrasonic TOFD/Diffraction shear wave/Defect detection/Quantitative calculation引用本文复制引用
张涛..基于衍射横波的焊缝近表面缺陷TOFD检测方法[J].天然气与石油,2017,35(3):1-5,5.
