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|Title:||Numerical Welding Simulation on a 14'' Narrow Gap Dissimilar Metal Weld|
|Authors:||COURTIN Stephan; GILLES Philippe; JOLY Pierre; OHMS Carsten; FICQUET Xavier|
|Citation:||Proceedings of 20th International Conference on STRUCTURAL MECHANICS IN REACTOR TECHNOLOGY p. Paper 1673 (1 - 8)|
|Type:||Contributions to Conferences|
|Abstract:||AREVA NP has developed narrow gap weld techniques to perform junctions between ferritic low alloy steel heavy section components and austenitic stainless steel piping systems. In parallel, numerical welding simulation has already demonstrated its relevance to predict residual stress fields in welded components. This paper presents computations on a 14" narrow gap Dissimilar Metal Weld (DMW) configuration. The analysis simulates each elementary step of the mock-up manufacturing procedure. Multipass welding simulation reproduces the deposit of each bead by thermo-metallurgical and mechanical calculations. The main original points of the work are: ¿ The choice of non linear kinematic hardening models, ¿ The use of strain annealing and phase transformation techniques, ¿ The post weld heat treatment simulation. For validation, the numerical results are compared to measurements obtained by both neutron diffraction and deep hole drilling techniques. The residual stress fields are observed at various locations from the weld centreline, in the depth of the pipe, and a very good agreement is obtained. Within the framework of narrow gap DMW configurations, this work gives another evidence of the relevance of the numerical welding simulation and highlights the capability for AREVA NP to perform, with success, such a kind of analyses.|
|JRC Institute:||Institute for Energy and Transport|
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