摘要：Magnetic flux leakage (MFL) testing is effective in detecting corrosion in ferromagnetic pipelines. However, the MFL generated at the crack is highly weak and is easily drowned in the strong background magnetic field and difficult to detect. Therefore, this paper creatively proposes a remanent magnetic flux leakage (RMFL) detection method. This method utilizes the hysteresis state of the pipeline after MFL detection and identifies crack defects by collecting the remanent magnetic flux density near the inner wall surface of the pipeline. The remanent magnetic field distribution near the pipeline surface is examined at different crack sizes, magnetization speeds, and lift-off values via theoretical analysis, finite element simulation, and experimental verification. In addition, experiments have demonstrated that in terms of crack detection capability, RMFL is superior to MFL. Therefore, adding a RMFL measurement module to the conventional MFL detector has important practical value. It can realize the targeted collaborative application of these two technologies, namely the synchronous detection of corrosion and crack defects, which greatly improves the detection coverage and detection efficiency.

关键字：Ferromagnetic pipeline; Hysteresis effect; Crack detection; Remanent magnetization

ISSN号：0263-2241

卷、期、页：卷: 242子辑: A

发表日期：2025-01-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCIE（科学引文索引网络版）,EI（工程索引）

发表期刊名称：MEASUREMENT

参与作者：李兴涛

通讯作者：魏昊天,徐鲁帅,陈帆

第一作者：董绍华,张行

论文类型：期刊论文

论文概要：魏昊天,董绍华,徐鲁帅,陈帆,张行,李兴涛，Internal inspection method for crack defects in ferromagnetic pipelines under remanent magnetization，MEASUREMENT，2025，卷: 242子辑: A

论文题目：Internal inspection method for crack defects in ferromagnetic pipelines under remanent magnetization