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Effects of a remanent magnetization on the sensing signals in magnetic flux leakage type NDT
2007 International Conference on Electrical Machines and Systems (ICEMS), 2007Sensitive detection of the defect signals in NDT system is critical. Because of a strong magnetic field in magnetic flux type NDT system, the object itself is magnetized and shows a hysteresis characteristics during the sensing, which might cause a distortion of the defect signals.
Kang Seo, Jae Man Han, Gwan Soo Park
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Theoretical studies of metal magnetic memory technique on magnetic flux leakage signals
NDT & E International, 2010Abstract Compared to traditional nondestructive testing methods, the technique of metal magnetic memory (MMM) is a more effective way in evaluating early damages of ferromagnets due to the existence of material stresses. In practical engineering, this technique has been extensively applied in different fields.
Z.D. Wang, K. Yao, B. Deng, K.Q. Ding
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Analysis of a Magnetization Effect on the Sensing Signals in Magnetic Flux Leakage type NDT
2006 12th Biennial IEEE Conference on Electromagnetic Field Computation, 2006Because of the strong magnetic field of the PIG in magnetic flux type NDT system, the object itself is magnetized and shows the hysteresis characteristics during the sensing which might cause the distortion of the defect signals. In this paper, the magnetizations of the pipeline in MFL type NDT are analyzed, and the methods are developed to compensate ...
G.S. Park +6 more
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Influence of inhomogeneous stress on biaxial 3D magnetic flux leakage signals
NDT & E International, 2020Abstract Magnetic memory method (MMM) is a newly developed passive nondestructive testing method, mainly used to detect the ferromagnetic materials. Because of the faster testing speed and the more convenient testing equipment, MMM has attracted many scholars’ attention.
Libo Wu +4 more
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Influence of Lüders bands on magnetic Barkhausen noise and magnetic flux leakage signals
Journal of Materials Science, 2002Luders bands, which occur during the onset of tensile plastic strain in most steels, are localized regions of high plastic strain within a specimen, bounded by regions that have undergone mainly elastic deformation. This study was conducted to understand the dependence of magnetic Barkhausen noise (MBN) and magnetic flux leakage (MFL) signals on Luders
A. Dhar, L. Clapham, D. L. Atherton
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3D Reconstructing of Arbitrary Defects with Magnetic Flux Leakage Testing Signals
2020 IEEE Far East NDT New Technology & Application Forum (FENDT), 2020By detecting and processing the Magnetic Flux Leakage (MFL) signals to identify and estimate the defects in ferromagnetic materials or structures, for example, in the steel pipelines, the so called Magnetic Flux Leakage Testing (MFLT) technology has been widely used in industry. However, the existing MFLT technology is suitable for locating the defects
Hong-Mei Li +4 more
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Adaptive Wavelets for Characterizing Magnetic Flux Leakage Signals from Pipeline inspection
INTERMAG 2006 - IEEE International Magnetics Conference, 2006Natural gas transmission pipelines are commonly inspected using magnetic flux leakage (MFL) method for detecting cracks and corrosion in the pipewall. Traditionally the MFL data obtained is processed to estimate an equivalent length (L), width (W), and depth (D) of defects.
JOSHI A +3 more
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The Effects of Flux Leakage Magnetizer Velocity on Volumetric Defect Signals
1995The inspection requirements of the hundreds of thousands of miles of pipeline worldwide necessitates the use of high inspection velocities. Unfortunately, high inspection velocities can compromise the ability to detect and characterize defects [1,2].
Davis, Richard, Nestleroth, J. Bruce
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Modeling the Effects of Pit Corner Geometry on Magnetic Flux Leakage Signals
Research in Nondestructive Evaluation, 2006Three-dimensional magnetic finite element analysis (FEA) has been used to simulate the effects of different pit corner geometries on magnetic flux leakage (MFL) signals. The pit corner geometries studied fall into three main categories: right angle, smooth triangular, and smooth round.
Vijay Babbar, Lynann Clapham
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Signal Processing Technology of Circumferential Magnetic Flux Leakage Inspection in Pipeline
2011 Third International Conference on Measuring Technology and Mechatronics Automation, 2011When detecting axially oriented defects in pipelines by circumferential magnetic flux leakage(MFL) internal inspection technology, the key is how to process the MFL detection signals. MFL signal processing methods are implemented, such as detection signal interpolation smoothing method, the amendment method of detection singular points, defect-free ...
Zhang Guoguang, Li Penghui
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