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Metals 2016, 6(2), 28; doi:10.3390/met6020028

Numerical Evaluation of Temperature Field and Residual Stresses in an API 5L X80 Steel Welded Joint Using the Finite Element Method

1
Programa de Pós-Graduação em Engenharia Mecânica, Universidade Federal de Campina Grande (UFCG), Campina Grande-PB 58429-140, Brazil
2
Universidade Federal Rural do Semi-Árido (UFERSA), Campus Caraúbas, Caraúbas-RN 59700-000, Brazil
3
Programa de Pós-Graduação em Informática Aplicada, Universidade de Fortaleza, Fortaleza-CE 60811-905, Brazil
4
Instituto de Ciência e Inovação em Engenharia Mecânica e Industrial, Departamento de Engenharia Mecânica, Universidade do Porto, Porto 4200-465, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 6 November 2015 / Revised: 30 December 2015 / Accepted: 18 January 2016 / Published: 25 January 2016
View Full-Text   |   Download PDF [5493 KB, uploaded 25 January 2016]   |  

Abstract

Metallic materials undergo many metallurgical changes when subjected to welding thermal cycles, and these changes have a considerable influence on the thermo-mechanical properties of welded structures. One method for evaluating the welding thermal cycle variables, while still in the project phase, would be simulation using computational methods. This paper presents an evaluation of the temperature field and residual stresses in a multipass weld of API 5L X80 steel, which is extensively used in oil and gas industry, using the Finite Element Method (FEM). In the simulation, the following complex phenomena were considered: the variation in physical and mechanical properties of the material as a function of the temperature, welding speed and convection and radiation mechanisms. Additionally, in order to characterize a multipass weld using the Gas Tungsten Arc Welding process for the root pass and the Shielded Metal Arc Welding process for the filling passes, the analytical heat source proposed by Goldak and Chakravarti was used. In addition, we were able to analyze the influence of the mesh refinement in the simulation results. The findings indicated a significant variation of about 50% in the peak temperature values. Furthermore, changes were observed in terms of the level and profile of the welded joint residual stresses when more than one welding pass was considered. View Full-Text
Keywords: multipass welding; temperature field; residual stress; finite element method; computer simulation multipass welding; temperature field; residual stress; finite element method; computer simulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Da Nóbrega, J.A.; Diniz, D.D.S.; Silva, A.A.; Maciel, T.M.; de Albuquerque, V.H.C.; Tavares, J.M.R.S. Numerical Evaluation of Temperature Field and Residual Stresses in an API 5L X80 Steel Welded Joint Using the Finite Element Method. Metals 2016, 6, 28.

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