Abstract
Nondestructive testing for ferromagnetic material equipment based on low-frequency electromagnetic technique (LFET) and signal difference is proposed. Magnetic field distributions of the defect area in or on the 20# steel surfaces are analyzed using the finite element method (FEM) based on COMSOL Multiphysics. After the signal difference converting, for a surface defect in the 1.2 to 9.6 mm depth, amplitude voltage ranges of 1.8 to 4.2 V and 2.5 to 3.5 V are obtained for the defects in 20# steel plate and pipe, respectively. In addition, compared with the traditional MFL, the 4.8-mm buried internal depth and the 9.6-mm depth surface defect are detected in the 12-mm-thick 20# steel plate or pipe, which is about 1.6 times higher than that of the current similar sensors.
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Acknowledgements
National Key R & D Program of China (2021YFF0600203), National Natural Science Foundation of China (12274386), Key R & D plan of Zhejiang Province (2021C01179) and Zhejiang Provincial Natural Science Foundation of China (LY21F050006).
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Yang, J., Liu, Z., Li, X. et al. Signal difference-based nondestructive low-frequency electromagnetic testing for ferromagnetic material pipe equipment. J Civil Struct Health Monit 14, 59–66 (2024). https://doi.org/10.1007/s13349-023-00694-5
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DOI: https://doi.org/10.1007/s13349-023-00694-5