TY - GEN A1 - Brekow, Gerhard A1 - Tscharntke, Dirk A1 - Munikoti, Vijayendra K. A1 - Erhard, Anton T1 - Querfehlerprüfung an Mischnahtverbindungen mit Ultraschall T2 - Jahrestagung Zerstörungsfreie Materialprüfung 2003 CY - Mainz, Deutschland DA - 2003-05-26 PY - 2003 UR - http://www.ndt.net/article/dgzfp03/papers/v14/v14.htm SN - 3-931381-47-1 N1 - Serientitel: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. – Series title: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. IS - 83-CD SP - 1(?) EP - 19(?) PB - DGZfP CY - Berlin AN - OPUS4-3167 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Erhard, Anton A1 - Munikoti, Vijayendra K. A1 - Brekow, Gerhard A1 - Tessaro, Ute A1 - Tscharntke, Dirk T1 - Modelling for the improvement of dissimilar weld inspection T2 - 16th World Conference on Nondestructive Testing CY - Montreal, Canada DA - 2004-08-30 PY - 2004 SP - 1 EP - 8(?) PB - International Committee for Non-Destructive Testing CY - Montreal AN - OPUS4-3518 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ernst, Hardy A1 - Munikoti, Vijayendra K. A1 - Wüstenberg, Hermann T1 - Experimentelle Verifizierung von Modellvorstellungen zur Schallausbreitung in anisotropen Materialien KW - Ultraschallausbreitung KW - Anisotropie KW - Modell KW - Experimentelle Verifizierung PY - 2004 SN - 1616-069X SN - 0948-5112 IS - 92 SP - 36 EP - 40 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung CY - Berlin AN - OPUS4-11603 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Erhard, Anton A1 - Munikoti, Vijayendra K. A1 - Brekow, Gerhard A1 - Tessaro, Ute ED - Bièth, M. ED - Whittle, J. T1 - Improved Dissimilar Weld Inspection for Transverse Discontinuities T2 - 5th International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurised Components CY - San Diego, CA, USA DA - 2006-05-10 KW - Ultraschallprüfung von Mischnähten KW - Gruppenstrahlertechnik KW - Mischnähte KW - Ultraschallprüfung PY - 2007 SN - 978-92-79-06107-3 SN - 1018-5593 N1 - Serientitel: JRC Scientific and Technical Reports – Series title: JRC Scientific and Technical Reports IS - Paper 1005 SP - 1 EP - 8 PB - Office for Official Publications of the European Communities CY - Luxembourg AN - OPUS4-16048 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - THES A1 - Munikoti, Vijayendra K. T1 - On the propagation of elastic waves in acoustically anisotropic austenitic materials and at their boundaries during non-destructive inspection with ultrasound KW - Ultraschall KW - Anisotropie KW - Austenit PY - 2000 SP - 1 EP - 206 AN - OPUS4-767 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Munikoti, Vijayendra K. T1 - On the propagation of elastic waves in acoustically anisotropic austenitic materials and at their boundaries during non-destructive inspection with ultrasound N2 - In der vorliegenden Arbeit wird die Ultraschallausbreitung in akustisch anisotropen, homogenen Werkstoffen mit stengelkristalliner Textur wie austenitischen Plattierungen und Schweißverbindungen, austenitischem Guss oder geschweißten Komponenten aus austenitischem Gus modelliert. Die Ergebnisse dieser Arbeit dienen als Vorgabe für Prüfanweisungen und Regelwerke, die besser als bisher an den Prüfgegenstand angepasst sind. T3 - BAM Forschungsberichtreihe - 249 PY - 2001 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-2010 SN - 978-3-89701-655-9 SN - 0938-5533 VL - 249 SP - 1 EP - 233 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-201 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Munikoti, Vijayendra K. A1 - Brekow, Gerhard A1 - Tessaro, Ute A1 - Erhard, Anton T1 - Ultrasonic inspection for transverse defects in dissimilar metal welds N2 - As a part ofthe cooling circuit in many nuclear power installations, dissimilar metals are welded together - for example, weid overlay cladding of austenitic material (either Inconel or 1.4550) on low alloy Steel. These welds are prone to stress corrosion Cracking. In some ofthe nuclear power stations, cracks were detected on the inner surface of the dissimilar weid. These cracks, which have their Orientation perpendicular to the weiding direction, are designated as transverse cracks. The purpose of the present investigation is to develop an ultrasonic testing method for reliable detection ofsuch transverse cracks. Very offen, crack detection and sizing in dissimilar welds with ultrasound can be very difficult due to the following reasons: 1. In a weiding process, high thermal gradients exist between the molten weid pool and the neighbouring colder regions. During the solidification process, grains grow along the direction of heat flow, yielding a textured structure. This results in a microstructure consisting of elongated grains, which causes the anisotropic nature of the weid region. An elastic wave in such an anisotropic medium undergoes beam skewing (i.e. phase and group velocity (Energy flow) directions are no longer coincident). 2. Due to the above mentioned grain structure, elastic properties vary spatially. This amounts to an ultrasonic wave undergoing multiple reflections at grain boundaries. The ray direction gets successively skewed at each grain boundary, resulting in a curved path. In addition to the grain boundaries, there are also interfaces between different parts ofthe dissimilar weid such as parent metal, transition layer, cladding and weid. At these interfaces, reflections and mode conversions occur in addition to scattering at grain boundaries. Altogether, ultrasonic inspection ofdissimilar welds for defect detection and sizing poses major challenges. Presently international research activities are concerned with the development of improved Signal Processing methods and optimizing strategies for qualifying ultrasonic inspection techniques for dissimilar welds. PY - 2012 SN - 978-3-87155-608-1 SN - 1618-4513 VL - 4 SP - 153 EP - 161 PB - DVS Media GmbH CY - Düsseldorf AN - OPUS4-26829 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -