安全、健康和环境2025，Vol.25Issue(12)：22-29,8.DOI:10.3969/j.issn.1672-7932.2025.12.004
涡流检测中铁磁材料预磁化研究
Research on Pre-magnetization of Ferromagnetic Materials in Eddy Current Testing
Lv Gaofeng1
作者信息
- 1. SINOPEC(Dalian)Petrochemical Research Institute Co.,Ltd.,Liaoning,Dalian 116045
- 折叠
摘要
Abstract
Aiming at the problem that the high permeability of ferromagnetic materials(such as Q235 steel commonly used in storage tank floors)leads to shallow eddy current penetration depth and poor detection per-formance in pulsed eddy current testing,this paper proposes a pre-magnetization method to improve detection performance.A permanent magnet magnetization scheme was designed using the finite element simulation soft-ware Ansys Maxwell to magnetize the material to a near-saturated state,thereby reducing its permeability and enhancing eddy current penetration capability.A workpiece model with defects was established to compare the response voltage signals of swept-frequency pulsed eddy current with and without pre-magnetization,and experi-mental verification was carried out.The results indicate that pre-magnetization significantly improves the detec-tion of bottom-surface defects,with a notable increase in differential signal amplitude;however,it has a limited effect on top-surface defects.Both simulation and experiments confirm that pre-magnetization effectively en-hanced the penetration capability and signal-to-noise ratio of eddy current testing in ferromagnetic materials,providing a feasible solution for intelligent detection of corrosion defects in storage tank floors.Although no spe-cific numerical comparisons were provided,the effectiveness of pre-magnetization was clearly demonstrated through waveform comparisons.关键词
涡流检测/集肤效应/预磁化/铁磁材料/脉冲涡流/储罐底板/无损检测Key words
eddy current testing/skin effect/pre-magnetization/ferromagnetic materials/pulsed eddy current/storage tank floor/nondestructive testing分类
能源科技引用本文复制引用
Lv Gaofeng..涡流检测中铁磁材料预磁化研究[J].安全、健康和环境,2025,25(12):22-29,8.
