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On Joint Application of Permanent and Alternating Fields in Magnetic Detection of Defects in Thick-Walled Steel Products

  • ELECTROMAGNETIC METHODS
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Abstract

The results of numerical modeling and experimental investigation of the possibilities of using simultaneous magnetization of a tested ferromagnetic product by strong constant and weak alternating fields are presented to determine the possibility of increasing the reliability of magnetic flaw detection of gas pipelines, especially for detecting stress-corrosion damage. The previously revealed occurrence of a local anomaly in the magnetic permeability of the product material correlating with the parameters of the underlying continuity defect in the presence of a strong permanent magnetic field on the defect-free side of the test object has been confirmed. As a result, the magnetic flux leakage (MFL) method, widely used for flaw detection of main gas pipelines, can in principle be supplemented by the use of an attached eddy current transducer to detect this local anomaly of magnetic permeability. This transducer can be used instead of (or in combination with) the permanent tangential magnetic field sensor commonly used in the MFL method. No advantages of such a replacement have been revealed. There were also no possibilities for detecting stress-corrosion damage by local changes in electrical conductivity at the location of the defect and no possibilities for using the SLOFEC method in the monitoring of main gas pipelines due to unacceptably high energy consumption.

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Funding

This work was carried out within the framework of the state task of the Ministry of Education and Science of the Russian Federation, topic 9, “Diagnostics,” project no. 122021000030-1.

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  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Yekaterinburg, Russia

    Yu. Ya. Reutov

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Correspondence to Yu. Ya. Reutov.

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Reutov, Y.Y. On Joint Application of Permanent and Alternating Fields in Magnetic Detection of Defects in Thick-Walled Steel Products. Russ J Nondestruct Test 58, 1129–1141 (2022). https://doi.org/10.1134/S1061830922700139

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  • DOI: https://doi.org/10.1134/S1061830922700139

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