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On Interaction of Elastic Waves with “Semitransparent” Defects

  • ACOUSTIC METHODS
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Abstract

The issues of identifying discontinuities that partially transmit ultrasonic waves are examined. Such defects are widespread in various products and welded joints of metals and plastics. Examples of “semitransparent” defects include lacks of fusion, “dead spots”, slag and other foreign inclusions in welded joints, flokens and oxide films in forgings and rolled products, etc. Moreover, even such well-studied defects as cracks can also partially transmit ultrasonic waves. However, to calculate and adjust the parameters of ultrasonic testing, hollow model reflectors (various drills, grooves, etc.), which do not transmit ultrasound, are traditionally used. The present article states that for the purposes of defect sizing, it is necessary to correctly calibrate and configure the flaw-detector–transducer kit taking into account the peculiarities of detecting defects of various types, including ones that are “semitransparent” for ultrasonic waves. To develop models of artificial reflectors imitating defects semitransparent for ultrasound, it is proposed to classify such semitransparent defects into three groups, viz., defects with filling, intermittent structures, and clogged weld. The main features of defects of these types are considered. Possible approaches to calculating the acoustic paths of ultrasonic flaw detectors when identifying defects of the three indicated types are described. It is noted that analytical and numerical methods can be used for calculating defects with filling; numerical methods should be preferred for intermittent structures; and analytical methods are better suited to defects of the clogging type.

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Notes

  1. In ultrasonic testing, it is customary to use the term B-scan for an axial sectional image of a weld, for example, a butt, obtained using phased array technology or the like.

  2. In the two-dimensional case, we are talking about one defect size in the plane in which the propagation of ultrasonic waves is considered.

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Funding

This work was carried out within the framework of the state task no. 075-0148-20-00 of December 20, 2019.

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Authors and Affiliations

  1. Welding and Testing Scientific-Educational Center, Bauman Moscow State Technical University, 107005, Moscow, Russia

    N. P. Aleshin & N. V. Krysko

  2. LLC Transneft Research and Development Institute for Oil and Oil Products Transportation (Transneft R&D), 117186, Moscow, Russia

    L. Yu. Mogilner

Authors
  1. N. P. Aleshin
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  2. L. Yu. Mogilner
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  3. N. V. Krysko
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Correspondence to N. P. Aleshin, L. Yu. Mogilner or N. V. Krysko.

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Translated by V. Potapchouck

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Aleshin, N.P., Mogilner, L.Y. & Krysko, N.V. On Interaction of Elastic Waves with “Semitransparent” Defects. Russ J Nondestruct Test 56, 469–478 (2020). https://doi.org/10.1134/S1061830920060030

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