Factors Affecting Magnetic Flux Leakage Inspection of Tailor-Welded Blanks

Montgomery, A.; Wild, Peter; Clapham, L.

doi:10.1080/09349840600689509

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Magnetic flux leakage (MFL) testing has been extensively used in engineering to ensure the operation safety of ferromagnetic structures and components, owing to its well-known high efficiency and high reliability [1][2][3][4]. In the case of MFL studies, much attention has been spent on the computational analysis of the magnetic field distribution using magnetic dipole models [5,6] or simulation method [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effects of surface roughness on magnetic flux leakage testing of micro-cracks

Deng

Sun

Yang

et al. 2017

Meas. Sci. Technol.

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Magnetic flux leakage (MFL) testing owns the advantages of high inspection sensitivity and stability, but its testing results are always affected by surface roughness. The relationship between the surface roughness () and detection signals for surface-breaking cracks is mainly discussed. The existence of roughness magnetic compression effect (RMCE) in present MFL testing is specially pointed out and its relevant theory is also analyzed, which manifest themselves in the compression of MFL signal in its peak value and the baseline drifts mixed with noise. An experimental investigation on surface comparators with different arithmetic average height () and artificial notch size, is performed to analyze the effects of surface roughness on detection signals of cracks. The detection limit (DL) of micro-crack is analyzed by comparing the noise-signal ratio () and peak-peak signals of the cracks. Meanwhile, increases with the and , in this case, relatively shallow defects cannot be clearly distinguished at determined rough surface. Afterwards, a series of simulations are designed and performed to verify the effects of surface roughness on characteristic of the electromagnetic field, and a theoretical DL of micro-crack is presented as: . Furthermore, the optimal lift-off value is selected for the micro-cracks’ detection to weaken the negative magnetic compression effect. MFL signals cannot reflect the accurate sizes of the cracks on rough surface due to the RMCE and its relevant phenomenon. The discovery and results will benefit the quantitative evaluation of the MFL testing.

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