MFL testing of omni-directional cracks in steel strip using strong longitudinal magnetization

Issue title: Selected Papers from the 14th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2009), Part II

Article type: Research Article

Authors: Song, Kai^a | Kang, Yihua^a | Sun, Yanhua^a | Qiu, Chen^a | Su, Jianke^b

Affiliations: [a] State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan, 430074, China | [b] BAOJI Petroleum Steel Pipe Co. Ltd, No. 10 Jiangtan Road, Baoji, Shanxi, 721008, China

Note: [] Corresponding author. Tel.: +86 27 87 55 69 42 80 08; Fax: +86 27 87 55 69 42 80 02; E-mail: yhkang@263.net

Abstract: A variety of defects in continuous steel strip may result in accidents. Traditional MFL (Magnetic flux leakage) testing method can lead to large blind area because steel strip is too broad to be rotated. A new MFL testing method that can inspect omni-directional cracks in steel strip is introduced in this paper. This method is characterized basically by the deep saturation state of steel strip generated. The property of inspection is investigated using 3-D finite element method. Waveform configurations of the experimental results agree with that of the theoretical predictions. Automatic inspecting equipment has been developed based on the new MFL method principle.

Keywords: MFL testing, strong longitudinal magnetization, omni-directional cracks, steel strip

DOI: 10.3233/JAE-2010-1243

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 3-4, pp. 1231-1236, 2010