Influence of motion induced eddy current on the magnetization of steel pipe and MFL signal

Feng, Bo; Kang, Yihua; Sun, Yanjing; Yang, Yun; Yan, Xizi

doi:10.3233/jae-162076

Cited by 19 publications

(4 citation statements)

References 7 publications

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“…Pullen et al [28] further investigated the results obtained by Wang et al and explained that the main reason for their finding was the saturation issue: if the plate is not saturated, the near side defect responses are amplified and this results in the increased leakage amplitude when the velocity is increased. Pullen et al also found that as velocity is increased, the distribution of the induced flux becomes more focussed on the near side, which agrees with the findings of Feng et al [30]. This result further indicates that the far-side defect is difficult to measure for a thick plate at higher scanning velocity.…”

Section: Introductionsupporting

confidence: 70%

Effect of Scanning Acceleration on the Leakage Signal in Magnetic Flux Leakage Type of Non-destructive Testing

et al. 2023

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This work investigates the influence of acceleration on the leakage signal in magnetic flux leakage type of non-destructive testing. The research is addressed through both designed experiments and simulations. The results showed that the leakage signal, represented by using peak to peak value, decreases between 15.1% and 26.6% under acceleration. The simulation results indicated that the main reason for the decrease is due to the difference in the distortion of the magnetic field for cases with and without acceleration, which is the result of the different eddy current distributions in the specimen. The findings will help to allow the optimisation of a magnetic flux leakage system to ensure that main defect features can be measured more accurately during the machine acceleration phase of scanning. It also shows the importance of conducting measurements at constant velocity, wherever possible.

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Section: Introductionsupporting

confidence: 70%

Effect of Scanning Acceleration on the Leakage Signal in Magnetic Flux Leakage Type of Non-destructive Testing

et al. 2023

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“…As the production speed increases, there is also a need for high-speed testing. For the encircling coil-type magnetizer, the motion-induced eddy currents are mainly focused on the edge of the magnetizing coil [ 52 , 53 , 54 , 55 , 56 ]. Wu also studied the distribution of eddy current in circumferential-type MFL testing [ 57 ].…”

Section: Factors Influencing Mfl Signalmentioning

confidence: 99%

A Review of Magnetic Flux Leakage Nondestructive Testing

Feng

et al. 2022

Materials

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Magnetic flux leakage (MFL) testing is a widely used nondestructive testing (NDT) method for the inspection of ferromagnetic materials. This review paper presents the basic principles of MFL testing and summarizes the recent advances in MFL. An analytical expression for the leakage magnetic field based on the 3D magnetic dipole model is provided. Based on the model, the effects of defect size, defect orientation, and liftoff distance have been analyzed. Other influencing factors, such as magnetization strength, testing speed, surface roughness, and stress, have also been introduced. As the most important steps of MFL, the excitation method (a permanent magnet, DC, AC, pulsed) and sensing methods (Hall element, GMR, TMR, etc.), have been introduced in detail. Finally, the algorithms for the quantification of defects and the applications of MFL have been introduced.

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“…In the field of nondestructive testing (NDT), velocity induced eddy current was first studied in high-speed magnetic flux leakage (MFL) testing [ 10 , 11 ]. A magnetizer is required to move relative to steel specimens to fulfill full scanning of the specimen surface in MFL testing [ 12 ]. At high speed, the relative movement between the magnetizer and conductors will generate considerable eddy currents to influence testing signals [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…A magnetizer is required to move relative to steel specimens to fulfill full scanning of the specimen surface in MFL testing [ 12 ]. At high speed, the relative movement between the magnetizer and conductors will generate considerable eddy currents to influence testing signals [ 12 , 13 , 14 ]. Afterwards, velocity induced eddy currents are used as a source to detect defects.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Inspecting Non-Ferromagnetic and Ferromagnetic Metals Using Velocity Induced Eddy Current Probe

Feng

Ribeiro

Rocha

et al. 2018

Sensors

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A velocity induced eddy current probe has been used to detect cracks in both non-ferromagnetic and ferromagnetic metals. The simulation and experimental results show that this probe can successfully detect cracks in both cases, but further investigation shows that the underlying principles for inspecting non-ferromagnetic and ferromagnetic metals are actually different. For an aluminum plate, the induced eddy current density and the signal amplitude both increase with probe speed, which means the signal is caused by velocity induced eddy currents. For a steel plate, probe speed changes the baselines of the testing signals; however, it has little influence on signal amplitudes. Simulation results show that the signal for cracks in a steel plate is mainly caused by direct magnetic field perturbation rather than velocity induced eddy currents.

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Influence of motion induced eddy current on the magnetization of steel pipe and MFL signal

Cited by 19 publications

References 7 publications

Effect of Scanning Acceleration on the Leakage Signal in Magnetic Flux Leakage Type of Non-destructive Testing

Effect of Scanning Acceleration on the Leakage Signal in Magnetic Flux Leakage Type of Non-destructive Testing

A Review of Magnetic Flux Leakage Nondestructive Testing

Comparison of Inspecting Non-Ferromagnetic and Ferromagnetic Metals Using Velocity Induced Eddy Current Probe

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