Crack Detection and Defect Classification Using the LLT-Technique
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
A method in current use for defect detection in thick walled components is the tandem technique [1]. With the aim to replace this cumbersome two-probe technique, a high sensitivity one-probe technique for the detection of perpendicularly oriented cracks and lack of fusion defects has been developed [2–4]. The high sensitivity of this so-called LLT-technique results from the effective mode conversion at the defect from a longitudinal wave to a shear wave and the exploitation of the specular reflections. In comparison to the tandem technique the LLT-technique shows an improved defect localization, improved accessibility of the inspection regions, minor obliquity dependence and minor cladding effects in the inspection of cladded components from the outside. Further, mode conversion effects can be used for a defect classification.