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Imaging of transverse cracks in austenitic welds with RT-SAFT

  • The synthetic aperture focusing technique (SAFT) is an imaging technique commonly used in ultrasonic inspection. In order to apply SAFT to the inspection of austenitic welds, the inhomogeneous anisotropic nature of the weld structure has to be taken into account. A suitable approach to accomplish this, is to couple the SAFT-algorithm with a ray tracing program (RT-SAFT). While SAFT-imaging of cracks in austenitic welds by use of ray tracing has been carried out before, all attempts so far were limited to longitudinal cracks which usually allows a treatment as 2-dimensional problem. In case of transverse cracks, a full 3-dimensional ray tracing is necessary in order to perform a SAFT-reconstruction. In this paper, we give an outline of our attempts to reconstruct images of transverse cracks in austenitic welds, utilizing 3-dimensional ray tracing and a layered structure model derived from an empirical model of grain orientations in welds. We present results of this RT-SAFT onThe synthetic aperture focusing technique (SAFT) is an imaging technique commonly used in ultrasonic inspection. In order to apply SAFT to the inspection of austenitic welds, the inhomogeneous anisotropic nature of the weld structure has to be taken into account. A suitable approach to accomplish this, is to couple the SAFT-algorithm with a ray tracing program (RT-SAFT). While SAFT-imaging of cracks in austenitic welds by use of ray tracing has been carried out before, all attempts so far were limited to longitudinal cracks which usually allows a treatment as 2-dimensional problem. In case of transverse cracks, a full 3-dimensional ray tracing is necessary in order to perform a SAFT-reconstruction. In this paper, we give an outline of our attempts to reconstruct images of transverse cracks in austenitic welds, utilizing 3-dimensional ray tracing and a layered structure model derived from an empirical model of grain orientations in welds. We present results of this RT-SAFT on experimental data taken from transverse cracks in different austenitic welds, which show that size and position of the cracks can be estimated with good accuracy, and compare them to images obtained by assuming an isotropic homogeneous medium which corresponds to the application of the classical SAFT-algorithm.zeige mehrzeige weniger

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Metadaten
Autor*innen:Christian Höhne, Sanjeevareddy Kolkoori, Mehbub-Ur Rahman, Jens PragerORCiD
Persönliche Herausgeber*innen:D.E. Chimenti, L.J. Bond, D.O. Thompson
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):40th Annual review of progress in quantitative nondestructive evaluation (Proceedings)
Jahr der Erstveröffentlichung:2014
Herausgeber (Institution):American institute of physics (AIP)
Verlag:AIP Publishing
Jahrgang/Band:1581
Erste Seite:148
Letzte Seite:155
Freie Schlagwörter:Austenitic welds; Ray tracing; SAFT; Transverse cracks
Veranstaltung:40th Annual review of progress in quantitative nondestructive evaluation
Veranstaltungsort:Baltimore, Maryland, USA
Beginndatum der Veranstaltung:21.07.2013
Enddatum der Veranstaltung:26.07.2013
DOI:10.1063/1.4864814
ISSN:0094-243X
ISBN:978-0-7354-1212-5
ISBN:978-0-7354-1211-8
Bemerkung:
Serientitel: AIP conference proceedings – Series title: AIP conference proceedings
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:05.06.2014
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