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Abstract <p>Many welded joints that are inspected using ultrasonic waves have inhomogeneous anisotropic properties. The digital aperture focusing (DAF) method can reconstruct high-quality images of reflectors in such welded joints, but for this it is necessary to know the distribution of crystallite rotation angles and the elasticity coefficient tensor in the region of deposited metal. To describe the inhomogeneous anisotropic properties of the deposited metal region, it can be divided into several homogeneous anisotropic regions differing from each other only by the crystallite rotation angle. The second option involves using the MINA model, which analytically describes the crystallite rotation angles as a function of coordinates. By comparing the signals reflected from the bottom of the sample measured by two or one antenna array with the bottom signals calculated in the Kirchhoff approximation, it is possible to estimate the crystallite rotation angles and the elasticity coefficients of the deposited metal region for a given type of symmetry. When working with the MINA model, its parameters and elasticity coefficients can be estimated. The effectiveness of the proposed approach has been demonstrated in numerical and model experiments.</p>

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Determination of the Distribution of Rotation Angles of Crystallites in Anisotropic Deposited Metal Based on Bottom Signals Measured by Antenna Arrays

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • E. G. Bazulin

摘要

Abstract

Many welded joints that are inspected using ultrasonic waves have inhomogeneous anisotropic properties. The digital aperture focusing (DAF) method can reconstruct high-quality images of reflectors in such welded joints, but for this it is necessary to know the distribution of crystallite rotation angles and the elasticity coefficient tensor in the region of deposited metal. To describe the inhomogeneous anisotropic properties of the deposited metal region, it can be divided into several homogeneous anisotropic regions differing from each other only by the crystallite rotation angle. The second option involves using the MINA model, which analytically describes the crystallite rotation angles as a function of coordinates. By comparing the signals reflected from the bottom of the sample measured by two or one antenna array with the bottom signals calculated in the Kirchhoff approximation, it is possible to estimate the crystallite rotation angles and the elasticity coefficients of the deposited metal region for a given type of symmetry. When working with the MINA model, its parameters and elasticity coefficients can be estimated. The effectiveness of the proposed approach has been demonstrated in numerical and model experiments.