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NDT.net Issue - 2017-11 - Articles
NDT.net Issue: 2017-11
Publication: e-Journal of Nondestructive Testing (NDT) ISSN 1435-4934 (NDT.net Journal)
ARTICLE

Sizing and evaluation of planar defects based on Surface Diffracted Signal Loss technique by ultrasonic phased array

A. Golshani Ekhlas12, Edward Ginzel2102, M. Sorouri1
1Pars Leading Inspection Company2, Tehran, Iran
2Materials Research Institute105, Waterloo, Canada

Abstract: Phased array defect detection and sizing by amplitude drop or tip diffraction techniques for weld inspection has been used for many years. But there are some limitations with these techniques. Compared to tip diffraction sizing, amplitude based sizing does not give accurate height sizing results. Tip diffraction sizing also has limitations. Sometime tip diffracted signals can be confused with small gas pores. Also, it is not always possible to detect both upper and lower diffracted signals. Evaluation of diffracted signals from surface scatter gives more accurate result compared to other sizing techniques and can help the operator recognize the planar and critical defects from other defects. The technique described follows the same rules of ultrasonic normal-beam testing for base metal inspection. When the beam hits defects larger than beam width (like lamination) the back wall reflection signal will reduce. Even if the defect is not parallel to the back wall and does not produce an echo response, the effect can be or shear wave inspection of welds by ultrasonic phased array, instead of back wall reflection, we have small diffraction signals from the material surfaces. When the beams hit planar defects, depending on size of defect, the shadow effect of the flaw can be seen as a loss of the surface diffraction signals.

Keywords: detection (66), sizing (13), crack sizing (4), Surface diffraction signals loss, planar defects (2), phased-array ultrasound,
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.

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