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Visualization of sound propagation with electrodynamic probes

  • When dealing in ultrasonic testing with inhomogeneous material structure data interpretation can be rather difficult. This is especially the case when using anisotropic dissimilar welds made from austenitic steel or nickel based alloys, which are currently used for modern power plant concepts. For better understanding of the complex interaction between the sound field and the component under test, the visualization of sound propagation in solids is a substantial task to increase the probability of detection of relevant defects. However, there exist only a small number of appropriate techniques published today, such as scanning laser interferometer, piezoelectric and optical approaches in case of transparent solids. In this work we present an electrodynamic technique providing a simple use and a high signal to noise ratio. By detecting the grazing beam with an electrodynamic probe with a size smaller than 10 mm, we measured the particle displacement as a function of time with aWhen dealing in ultrasonic testing with inhomogeneous material structure data interpretation can be rather difficult. This is especially the case when using anisotropic dissimilar welds made from austenitic steel or nickel based alloys, which are currently used for modern power plant concepts. For better understanding of the complex interaction between the sound field and the component under test, the visualization of sound propagation in solids is a substantial task to increase the probability of detection of relevant defects. However, there exist only a small number of appropriate techniques published today, such as scanning laser interferometer, piezoelectric and optical approaches in case of transparent solids. In this work we present an electrodynamic technique providing a simple use and a high signal to noise ratio. By detecting the grazing beam with an electrodynamic probe with a size smaller than 10 mm, we measured the particle displacement as a function of time with a spatial resolution in the order of 1 mm. Adapting the electrodynamic probe and its coil alignment allows for measuring the displacement components in all three dimensions. This comprises the detection of the horizontal and vertical particle displacement with respect to the surface and thus also the transformation from longitudinal waves into transversal waves and vice versa is possible. A SNR of higher than 36 dB could be achieved within ferromagnetic and high conductive chrome steel when using a transversal wave generated by an angled beam transducer. We report on measurements of the sound field in complex weld joints. One example shows a 10 mm thick narrowgap weld joining a nickel alloy with a chrome steel yielding a substantial anisotropy of the weld structure. The test system enables us to visualize the wave propagation within the weld and indicates the reflection scenario and the energy losses due to both the anisotropic structure and material defects.zeige mehrzeige weniger

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Metadaten
Autor*innen:Uwe Völz, Heinz Mrasek, Klaus Matthies, Marc Kreutzbruck
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):ECNDT 2010 - 10th European conference on non-destructive testing (Proceedings)
Jahr der Erstveröffentlichung:2010
Herausgeber (Institution):European federation for non-destructive testing (EFNDT)
Erste Seite:1
Letzte Seite:8
Freie Schlagwörter:Anisotropic weld; Electrodynamic probe; Narrow-gap weld; Nickel alloy; Nondestructive testing (NDT); Sound field; Ultrasonic; Visualization
Veranstaltung:ECNDT 2010 - 10th European conference on non-destructive testing
Veranstaltungsort:Moscow, Russia
Beginndatum der Veranstaltung:2010-06-07
Enddatum der Veranstaltung:2010-06-11
ISBN:978-1-617-82791-4
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
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