Evaluation of Residual Stresses in Butt Welded Joint of Dissimilar Material by FEM

Abstract:

The study proposed within this paper deals with an application of finite element techniques to the thermo-structural analysis of a dissimilar butt-welded joint. Residual stresses induced by the fusion arc-welding of steel joints in power generation plants are a concern to the industry. Nowadays, the application of finite element method appears to be a very efficient method for the prediction and the investigation of the weld-induced residual stresses, nevertheless the detailed modelling of all phenomena involved in such process is still challenging. The structural integrity assessment of welded structures strongly requires a deep investigation of weld-induced residual stresses in order to be compliant with safety requirement of power plant. The longitudinal and transversal residual stresses in dissimilar material butt joints of 8 mm thick for V-groove shape were studied. The developed thermo-mechanical FE model as well as the simulation procedures are detailed and results are discussed. As a result of such work, it has been found out that residual stresses in the two dissimilar plates are characterized by very different magnitudes and distribution.

• Periodical: Key Engineering Materials (Volume 754)
• Pages: 268-271
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.754.268
• Online since: September 2017
• Authors: Raffaele Sepe*, M. Laiso, A. de Luca, Francesco Caputo
• Keywords: Dissimilar Materials, Residual Stress, SMAW, Welding

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