Estudo Numérico e Experimental da Evolução Microestrutural e das Propriedades de Juntas Soldadas de Vergalhões pelo Processo GMAW

Demarque, Rudineli; Castro, José Adilson de; Xavier, Carlos Roberto; Almeida, Darlene Souza da Silva; Marcelo, Célio de Jesus; Santos, Ellem Patrícia dos; Queiroz, Anderson Vergílio de

doi:10.1590/0104-9224/si2004.10

Cited by 4 publications

(7 citation statements)

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“…The model takes into account the heat transfer by radiation, convection and conduction. The mass transfer due to consumable deposition and dilution within metal base melting and solidification are considered and the properties changes due to local composition and temperature are taken into account [9][10][11][12] . The temperature distribution is obtained by solving the energy conservation, shown in Equation (1) 9-12…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…The heat input is supplied by the moving torch. We assume the well-known double-ellipsoid model [9][10][11][12][13]22 . The heat source is a combination of two ellipses in the front and rear quadrants.…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…The spatial distribution parameters f f and f r are the fraction of the total heat received in the front and rear quadrant, respectively. The parameters are chosen attaining the relationship [9][10][11][12]22 , f f + f r = 2. The heat input constant parameters a,b f ,c and b r , are sellected to account for the torch heat distribution [9][10][11][12] .…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…However, for large equipments and welding pieces it is common to use multiple pass welding procedure and some regions can relay into the gap of temperature and time suitable to form the deleterious phases. Thus, the design of an adequate welding procedure is important to make or repair the equipment to work under safety conditions [9][10][11][12] . In this work we propose an approach that could help on this task.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the computer code used has been continuously updated by the authors and applied for different materials and welding conditions 3,6,[9][10][11][12] . In this paper we introduce new features to improve the model capability such as routines for kinetics of phase transformations for super duplex stainless steels 7,8 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of Local Heat Input Conditions on the Thermophysical Properties of Super Duplex Stainless Steels (SDSS)

et al. 2018

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The properties of the super duplex stainless steels (SDSS) are strongly affected by the thermal history imposed by welding procedures. The controlled dual phase microstructure (ferrite and austenite) guarantee excellent mechanical properties such as mechanical strength and corrosion resistance, in addition to small thermal expansion coefficient and high thermal conductivity. In this paper, we newly proposed a model able to predict the thermal history of the welding pieces coupled with local mechanical properties developed during welding procedure that combine the effects of temperature and phase changes during welding. We applied inverse method to fit the thermophysical parameters based on measured data. The model was verified by comparing measured and predicted temperature profiles using thermocouples located within the heat affected zone. Thus, an inverse method was implemented to obtain the parameters fitting for the grain growth evolution compatible with the final microstructure and grain size measured using SEM images and stereological techniques. We demonstrated that very small amount of non-equilibrium deleterious phases and nanosized precipitated are expected during the welding procedures depending upon the local conditions of temperature, compositions and alloying dilution evolutions.

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Section: Numerical Proceduresmentioning

confidence: 99%

Section: Numerical Proceduresmentioning

confidence: 99%

Section: Numerical Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Local Heat Input Conditions on the Thermophysical Properties of Super Duplex Stainless Steels (SDSS)

et al. 2018

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Evaluation of the effect of the thermal cycle on the characteristics of welded joints through the variation of the heat input of the austhenitic AISI 316L steels by the GMAW process

Demarque

Santos

Silva

et al. 2018

Science and Technology of Materials

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Estudo Experimental e Numérico de Tensões Residuais em Juntas Soldadas com e sem Restrição

2017

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado.Recebido: 18 Jan., 2017 Aceito: 21 Jun., 2017 E-mails: dcasassola@id.uff.br (DCG), mcindra@vm.uff.br (MPCF)Resumo: O conhecimento das tensões residuais geradas nos processos de soldagem apresenta especial importância no desempenho das estruturas e componentes soldados, pois durante a vida em serviço eles estarão sujeitos a diferentes níveis de carregamentos, que associados aos campos de tensões residuais pré-existentes podem levar à ruptura inesperada. Neste contexto, o presente trabalho tem como objetivo estudar o nível das tensões residuais geradas em juntas soldadas, pelo processo arame tubular (FCAW -Flux Cored Arc Welding), de aço ASTM A 131 Grau A, usadas na construção naval, por difração de raios-X, usando a técnica do sen 2 ψ. Foi realizado um estudo comparativo das mudanças nos campos de tensões quando adotadas restrições para manter a geometria de projeto da junta, bem como uma análise numérica computacional pelo método de elementos finitos, com os resultados obtidos pelo método experimental. A maioria dos resultados das tensões residuais mostrou que houve similaridade qualitativa, na sua natureza, entre o modelo e os experimentos nas regiões da zona termicamente afetada e do metal de solda. As análises de microdureza Vickers e a caracterização microestrutural por microscopia óptica das juntas soldadas complementaram o presente estudo.Palavras-chave: Soldagem; Tensões residuais; Graus de restrição; Difração de raios-X; Método dos elementos finitos. Numerical and Experimental Study of Residual Stress in Welded Joints with and without ConstraintAbstract: The knowledge of the residual stresses generated on the welding processes implies special relevancy in welded structures and components, because during his service life they will be working at several loading conditions that associated to the pre-existing residual stresses fields they can lead to a catastrophic failure. In this context, the present work has the purpose to study the residual stresses field generated in joints welded by the FCAW (Flux Cored Arc Welding) process, of ASTM A 131 grade A steel, used in ship construction, by X-ray diffraction, using the sin 2 ψ technique. It was realized a comparative study of the changes in the stress fields when adopted restrictions in order to maintain the design of the joint, as such a numerical computational analysis by the finite element method, with the results of the experimental analysis. The majority of residual stresses results had demonstrated qualitative similarity in their nature between the model and the experimental work in the heat affected region and welded zone. The Vickers microhardness analysis and microstructural characterization by optical microscopy had complemented the present work. Key-words:Welding; Residual stresse...

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Estudo Numérico e Experimental da Evolução Microestrutural e das Propriedades de Juntas Soldadas de Vergalhões pelo Processo GMAW

Cited by 4 publications

References 5 publications

Effects of Local Heat Input Conditions on the Thermophysical Properties of Super Duplex Stainless Steels (SDSS)

Effects of Local Heat Input Conditions on the Thermophysical Properties of Super Duplex Stainless Steels (SDSS)

Evaluation of the effect of the thermal cycle on the characteristics of welded joints through the variation of the heat input of the austhenitic AISI 316L steels by the GMAW process

Estudo Experimental e Numérico de Tensões Residuais em Juntas Soldadas com e sem Restrição

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