Sizing Canted Flaws in Weldments Using Low-Frequency Emats

  • Raymond E. Schramm
  • Thomas A. Siewert
Conference paper
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series (RPQN, volume 6 A)


Techniques for detecting and sizing flaws with electromagnetic-acoustic transducers (EMATs), previously used successfully for normal planar flaws, were applied to canted flaws in steel plates. Comparisons were made between metallographic and ultrasonic measurements on specially prepared welds. Results indicated a high probability of detecting canted flaws (> 0.5-mm deep) with EMATs. The EMAT sizing was highly repeatable and, for the most part, very accurate. Some, as yet unexplained, inaccuracies did show up, however, in some weld sections. There is a possibility that the calibration curve may be more complex for canted flaws than for normal flaws.


Normal Flaw Shear Horizontal Flaw Depth Plate Mode Shear Horizontal Wave 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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    R. E. Schramm and T. A. Siewert, in: “Review of Progress in Quantitative Nondestructive Evaluation, 5B,” D. O. Thompson and D. E. Chimenti, eds., Plenum Press, New York (1986), p. 1705.Google Scholar
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    S. K. Datta, R. E. Schramm, and Z. Abduljabbar, “Plate Modes Generated by EMATs for NDE of Planar Flaws,” these proceedings.Google Scholar

Copyright information

© Springer Science+Business Media New York 1987

Authors and Affiliations

  • Raymond E. Schramm
    • 1
  • Thomas A. Siewert
    • 1
  1. 1.Fracture and Deformation DivisionNational Bureau of StandardsBoulderUSA

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