DC-biased Induction Thermography for Sub-surface Defects of Pipelines

doi:10.3901/JME.2021.22.080

Abstract

Abstract: Due to the limitation of skin effect of high frequency electromagnetic field, induction thermography cannot realize the scanning detection of sub-surface defects of pipeline. In order to overcome this problem, a DC-biased induction thermography for pipelines based on DC-biased magnetization is proposed:under direct current(DC) magnetization, the sub-surface defects will cause the distortion of the permeability distribution in the skin depth layer of the outer surface, and further form the non-uniform temperature field distribution on the surface, which will establish the correlation between sub-surface defect and the temperature field on the surface. Firstly, based on the principle of induction heating and the characteristics of non-linear ferromagnetic materials, the detection principle of the proposed method is described; then, the finite element simulation model is established to analyze and obtain the squeezing effect of magnetic lines and the permeability variation law caused by defects in different buried depths; finally, DC-biased induction thermography system for pipelines is developed. The experimental results show that the novel method can effectively detect the sub-surface defects with buried depth up to 5.0 mm at the inspection speed of 150 mm/s. The proposed method can not only be used for the scanning detection of pipelines, but also has important theoretical significance and practical value for induction thermography of other ferromagnetic components.

Key words: pipeline, induction thermography, permeability, sub-surface defect, DC-biased magnetization

CLC Number:

TG156

WU Jianbo, XU Zhaoyuan, JI Fang, ZHANG Muchao, XIA Hui, CHEN Yanting, KANG Yihua. DC-biased Induction Thermography for Sub-surface Defects of Pipelines[J]. Journal of Mechanical Engineering, 2021, 57(22): 80-87.

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