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The Role of Weld Processing on the Integrity Assessment of Bimetallic Girth Welds

[+] Author Affiliations
Gabriel Testa, Nicola Bonora, Andrew Ruggiero

University of Cassino and Southern Lazio, Cassino, Italy

Antonio Carlucci

SAIPEM SA, Montigny-le-Bretonneux, France

Gianluca Iannitti

Techdyn Engineering, Rome, Italy

Paper No. PVP2014-28019, pp. V003T03A067; 5 pages
  • ASME 2014 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Anaheim, California, USA, July 20–24, 2014
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4600-1
  • Copyright © 2014 by ASME


Current design standards and codes do not provide specific guidance how to perform engineering criticality assessment with bi-metallic girth weld in lined or clad pipe. Recently, Bonora et al. (Proc. ASME 2013 32nd OMAE conf.) proposed the equivalent material method (EMM) which allows one to still use current design assessment routes. The method consists in considering instead of three materials in the weld joint, a single “equivalent” material with a flow curve defined as the interpolated lower bound of the three weld joint material flow curves. In this work, the applicability of the EMM was verified considering the effect associated to weld residual stresses. To this purpose, two flaw geometry configurations have been investigated. Particular relevance was given to the multi-pass weld process simulation. Numerical results indicate that the EMM always provides reasonable results in terms of applied J with respect to those obtained considering the effective multimaterials configuration in the weld joint.

Copyright © 2014 by ASME



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