Discussion on the Principle and Reliability Improvement of AC Magnetic Flux Leakage Detection of Steel Rod
American Journal of Physics and Applications
Volume 7, Issue 2, March 2019, Pages: 48-54
Received: Mar. 13, 2019;
Accepted: May 7, 2019;
Published: Jun. 4, 2019
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Baishang Hu, Shaoguan Baosteel Special Steel Co., Ltd., Shaoguan, China
In this paper, the principle of ac magnetic flux leakage (referred to as MFL) detection is presented by analyzing the formation of ac magnetic flux leakage and how it is collected. It is found that ac excitation frequency is a very important equipment parameter for ac magnetic flux leakage detection of steel rod. High-frequency current not only stabilizes the penetration depth of ac magnetic field under the rod surface and leakage magnetic field of defects, but also improves the ability to detect defects and adapts to higher detection speed. It is concluded that the lift-off effect is the fundamental reason affecting the reliability of MFL detection of steel rod, and there is an inherent signal amplitude deviation from the irremovable probe bouncing on the surface of steel rod. Then, the factors that aggravate the lift-off effect are analyzed synthetically, and the corresponding countermeasures are put forward. It provides an effective basis for improving the test reliability and reasonably controls the quality risk of the rod.
Discussion on the Principle and Reliability Improvement of AC Magnetic Flux Leakage Detection of Steel Rod, American Journal of Physics and Applications.
Vol. 7, No. 2,
2019, pp. 48-54.
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/
) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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