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
Views 476 Downloads 87
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.
DENG Zhi-yang, YANG Yun, FENG Bo, KANG Yi-hua. Influence of Surface Roughness on MFL Inspection of Cracks [J] Non-destructive testing. 2016 No. 02 pp. 40-44.
TANG Qi, FENG Bo YANG Yun KANG Yi-hua. Influence of Surface Roughnesson Eddy Current Testing [J]. Non-destructive testing. Issue No. 03 2016. Pp. 47-51.
Fanhong. Magnetic leakage detection of ferromagnetic metal materials [M]. Committee for the Accreditation and Certification of Metallurgical Non-destructive Test Personne.. Beijing: China Science and Technology Press. 2016.
Songzhizhe. Magnetic powder testing (2nd edition) [M]. Organized by the China Special Equipment Inspection Association, Beijing: China Labor Social Security Press. April 2007, No. 2.
Yedaiping and Suliguang. Magnetic powder testing [M]. Committee on the Compilation and Examination of Training Materials for Qualification and Certification of Non-destructive Testing Personnel in National Defense Science and Technology. Beijing: China Machine Press. March 2004.
LIN Jun-ming. Research on Magnetic Flux Leakage Detection Technology and Its Development Status. [J] Non-destructive testing. Vol. 30 No. 1 February. 2006: 1~5.
Lijiawei. Non-destructive testing manual (2nd edition) [M]. Beijing: China Machine Press. 2011. pp. 5-31 ~ 5-34.
Xu Yanfang. Qualitative explanation of skin effects [J]. Journal of Teachers College of Qingdao University. No. 2, 1997. pp. 72-73.
Huang Changming. Analysis and discussion on skin effect [J]. J. of Henan Univ (Nat.Sci.). Vol. 23, No. 3, 1993. pp. 46-47.
Kang Yihua Wu Xinjun Yang Shuzi. SIGNAL PROCESSING TECHNOLOGY FOR MAGNETIC [J] Non-destructive testing. Vo l. 22 No. 6 June 2 0 0 0:255~249.
DU Zhi-Ye1, RUAN Jiang-Jun, YU Shi-Feng, Selection of Radial and Axial Components from Magnetic Flux Leakage Signals [J]. Non-destructive testing. Vol. 32, No. 07 2010: 480~484
LIAO Changrong, LIAO Zheng, HAN Liang, WANG Binbo, SHI Xiangcong, XIE Yunshan. Nalytical study on crack magnetic flux leakage for ferromagnetic componentand detection system based on geomagnetic field [J]. Journal of Chongqing University. Vol. 35 No. 10 Oct. 2012: 77~84.
HAN Ling, LIAO Chang-rong, WANG Bin-bo, SHI Xiang-cong, XIE Yun-shan, WEI Wen-xiong. alytical Study on Crack Magnetic Flux Leakage for Ferromagnetic Components and It’s Detection Device [J]. Journal of Southwest University (Natural Science Edition) Vol. 34 No. 7 Jul. 2012: 1~6.
American Society of Nondestructive Testing (ASNT). Nondestructive Testing Handbook-Magnetic powder Testing [M]. Translation and Review Committee of American Society of Nondestructive Testing. Shanghai: World Book Inc. 1992, pp. 259-265.
GB/T32547-2016. Method for magnetic flux leakage testing of round steel [S].
LI Luming, HUANG Songling, SHI Keren. AC and DC magnetizing for magnetic flux leakage testing [J]. J Tsingh ua Univ (Sci & Tech), 2002, Vo l. 42, No. 2.
FAN Hong, JIA Hui-ming. Exploration on the steel rods AC magnetic flux leakage testing technique [J]. Physics Examination and Testing. Vol. 33, No. 6, 2015. pp. 1-5.