A Novel Method for Distinguishing Discontinuities In Ferromagnetic Materials Based On Eddy Current Testing Under Magnetization

IF 0.5 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Evaluation Pub Date : 2023-06-01 DOI:10.32548/2023.me-04284

G. Jia, Pengchao Chen, Rui Li, Kuan-Chung Fu, Rongbiao Wang, K. Song

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引用次数: 0

Abstract

Detecting inner- and outer-surface discontinuities of drill pipe is of great significance to the evaluation of the quality of the drill pipe. This paper proposes a method based on a magnetized eddy current testing technique to detect inner- and outer-surface discontinuities by analyzing the difference of the imaginary part signal characteristics of the receiving coil. For eddy current testing, the outer-surface discontinuities cause the local conductivity to be zero, while inner-surface discontinuities cause the perturbation of the magnetic permeability on the material surface. In this paper, the effects of conductivity distortion and permeability perturbation on induced eddy currents are analyzed by simulation. The conductivity distortion increases the magnetic field above the discontinuity compared to the magnetic field without the discontinuity, while the permeability perturbation reduces the magnetic field. Next, the difference in coil impedance can be used to distinguish the inner- and outer-surface discontinuities. Finally, the feasibility of the method is verified by experiments, and the results show that the inner- and outer-surface discontinuities can be discriminated.

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基于磁化条件下涡流检测的铁磁材料不连续性判别新方法

检测钻杆内外表面不连续性对评价钻杆质量具有重要意义。本文提出了一种基于磁化涡流检测技术的方法，通过分析接收线圈虚部信号特性的差异来检测内表面和外表面的不连续性。对于涡流检测，外表面不连续性导致局部电导率为零，而内表面不连续导致材料表面磁导率的扰动。本文通过仿真分析了电导率畸变和磁导率扰动对感应涡流的影响。与没有不连续性的磁场相比，电导率畸变增加了不连续性以上的磁场，而磁导率扰动降低了磁场。接下来，线圈阻抗的差异可以用来区分内表面和外表面的不连续性。最后，通过实验验证了该方法的可行性，结果表明，该方法可以区分内表面和外表面的不连续性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Evaluation 工程技术-材料科学：表征与测试

CiteScore

0.90

自引率

16.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Materials Evaluation publishes articles, news and features intended to increase the NDT practitioner’s knowledge of the science and technology involved in the field, bringing informative articles to the NDT public while highlighting the ongoing efforts of ASNT to fulfill its mission. M.E. is a peer-reviewed journal, relying on technicians and researchers to help grow and educate its members by providing relevant, cutting-edge and exclusive content containing technical details and discussions. The only periodical of its kind, M.E. is circulated to members and nonmember paid subscribers. The magazine is truly international in scope, with readers in over 90 nations. The journal’s history and archive reaches back to the earliest formative days of the Society.