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Contribution à la caractérisation en contrôle non-destructif ultrasonore de défauts de soudures bout-à-bout en acier carbone : élaboration d'une procédure complète automatisée au diagnostic

Abstract : The second edition of the guideline IS. US. 319,21 has been issued in 1995. The Part B of this document (?Cascade? procedure) has been proposed as a draft for european standard and issued as the EN 1713 european standard without main modifications. This document defines a method of characterization for ultrasonic manual weld testing, in which the ?Cascade? procedure is described as succession of five steps allowing to classify the detected flaws in volumetric or non-volumetric flaws. In order to ensure the repeatability and to decrease significantly the time of interpretation, nowadays the researchers try to develop an automated flaw classification based on the ?Cascade? procedure. The aim of our study is to realize an interactive help to sentence the type of flaw automated as for as possible. Our work has been divided in two phases : the first one concerns the four first steps of the ?Cascade? procedure. For the three first steps, we have found significative graphics, whereas for the fourth step, we have studied the flaw echo ?roughness? in comparison with the reference echo ?roughness?. The twenty-seven studied flaws have been classified successfully. The fifth last step concerns the discrimination between the rough cracks (corresponding to the VARIAL pattern), generally unacceptable, and the clustered porosities (corresponding to the VAROUL patter). This automated discrimination had not already been realized. We have searched for an efficient algorithm and found two features which have allowed to classify the real studied flaws without any ambiguity
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https://hal.univ-lorraine.fr/tel-01749121
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Nathalie Kopp. Contribution à la caractérisation en contrôle non-destructif ultrasonore de défauts de soudures bout-à-bout en acier carbone : élaboration d'une procédure complète automatisée au diagnostic. Autre. Université Paul Verlaine - Metz, 1999. Français. ⟨NNT : 1999METZ004S⟩. ⟨tel-01749121⟩

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