Chinese Journal of Mechanical Engineering >

2021 , Vol. 34 >Issue 4: 63 - 63

DOI: https://doi.org/10.1186/s10033-021-00579-y

Intelligent Manufacturing Technology

Magnetic Flux Leakage Course of Inner Defects and Its Detectable Depth

  • Jianbo Wu ,
  • Wenqiang Wu ,
  • Erlong Li ,
  • Yihua Kang
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  • 1. School of Mechanical Engineering, Sichuan University, Chengdu 610065, China;
    2. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Received date: 2020-02-27

  Revised date: 2021-02-08

  Online published: 2021-12-21

Supported by

Supported by National Natural Science Foundation of China (Grant Nos. 51907131, 92060114), and Sichuan Science and Technology Program (Grant Nos. 2020YFG0090, 2021YFG0039, 2020ZDZX0024)

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Abstract

As a promising non-destructive testing (NDT) method, magnetic flux leakage (MFL) testing has been widely used for steel structure inspection. However, MFL testing still faces a great challenge to detect inner defects. Existing MFL course researches mainly focus on surface-breaking defects while that of inner defects is overlooked. In the paper, MFL course of inner defects is investigated by building magnetic circuit models, performing numerical simulations, and conducting MFL experiments. It is found that the near-surface wall has an enhancing effect on the MFL course due to higher permeability of steel than that of air. Further, a high-sensitivity MFL testing method consisting of Helmholtz coil magnetization and induction coil with a high permeability core is proposed to increase the detectable depth of inner defects. Experimental results show that inner defects with buried depth up to 80.0 mm can be detected, suggesting that the proposed MFL method has the potential to detect deeply-buried defects and has a promising future in the field of NDT.

Key words： Magnetic flux leakage (MFL) testing; Inner defect; Buried depth; Permeability

Cite this article

Jianbo Wu , Wenqiang Wu , Erlong Li , Yihua Kang . Magnetic Flux Leakage Course of Inner Defects and Its Detectable Depth[J]. Chinese Journal of Mechanical Engineering, 2021 , 34(4) : 63 -63 . DOI: 10.1186/s10033-021-00579-y

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