Numerical and experimental study of thermally induced residual stress in the hybrid laser–GMA welding process

Kong, Fang; Ma, Jingsen; Kovacevic, Radovan

doi:10.1016/j.jmatprotec.2011.01.012

Cited by 140 publications

(62 citation statements)

References 17 publications

(15 reference statements)

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“…Demarque et al (2015) utilizaram o modelo de Goldak para simulação da fonte de calor na soldagem de vergalhões utilizados na construção civil. Vários autores (Chang e Teng, 2004;Kong et al, 2011;Manurung et al, 2013;Pamnani et al, 2016) desenvolveram modelações em elementos finitos do processo de soldagem a arco utilizando o modelo de Goldak, sempre validadas por métodos experimentais e obtiveram resultados satisfatórios. Nestes trabalhos a análise desacoplada tem sido considerada aceitável para a simulação do processo e o método experimental utilizado na maioria deles tem sido o de difração de raios-X.…”

Section: Estudo Experimental E Numérico De Tensões Residuais Em Juntaunclassified

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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Section: Estudo Experimental E Numérico De Tensões Residuais Em Juntaunclassified

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

2017

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“…Such a type of analysis is based on an assumption that heat generated during plastic deformation is significantly lower than heat supplied by an electric arc. That is why it is possible to carry out thermal and mechanical analysis as two separate analyses one after the other [1][2][3][4][5].…”

Section: Problem Descriptionmentioning

confidence: 99%

“…A short product life cycle between subsequent changes of models or solutions makes classical prototyping unprofitable and often unfeasible due to time restrictions and the quickly increasing complexity of products manufactured today [1,[3][4][5]. More than a decade ago 3D engineering software opened engineering personnel to new possibilities.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Duplex Steel Multipass Welding

Giętka¹,

Ciechacki²,

Kik³

2016

Archives of Metallurgy and Materials

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Analyses based on FEM calculations have significantly changed the possibilities of determining welding strains and stresses at early stages of product design and welding technology development. Such an approach to design enables obtaining significant savings in production preparation and post-weld deformation corrections and is also important for utility properties of welded joints obtained. As a result, it is possible to make changes to a simulated process before introducing them into real production as well as to test various variants of a given solution. Numerical simulations require the combination of problems of thermal, mechanical and metallurgical analysis. The study presented involved the SYSWELD software-based analysis of GMA welded multipass butt joints made of duplex steel sheets. The analysis of the distribution of stresses and displacements were carried out for typical welding procedure as during real welding tests.

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“…However, thermal residual stresses in HLAW do develop as a result of the nonuniform heating and cooling during welding [9], and welding residual stress can lead to performance degradation by various mechanisms. Welds of steel armor plate (MIL-A-46100) have exhibited cracking after field service, with the cause ultimately attributed to stress-corrosion cracking, hydrogen-assisted cold cracking, and harsh vehicle usage [10].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a better understanding of welding-induced thermal stresses can mitigate damage by precluding those forms of cracking. Several modeling efforts have been directed to the process to evaluate heat transfer and subsequent microstructural and residual stress evolution [6,9]. X-ray diffraction was used in the latter study to experimentally determine residual stresses in steel hybrid laser arc (HLA) welds for validation of numerical simulations [9].…”

Section: Introductionmentioning

confidence: 99%

Correlation of Neutron-Based Strain Imaging and Mechanical Behavior of Armor Steel Welds Produced with the Hybrid Laser Arc Welding Process

Sowards

Hussey

Jacobson

et al. 2018

J. RES. NATL. INST. STAN.

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Bragg edge neutron transmission imaging was used to characterize the spatial distribution of thermally induced residual strains in a steel armor plate welded with a hybrid laser arc process. This residual strain distribution was compared to the spatial development of mechanical strain during uniaxial deformation. By correlating the strain measurements of both methods, the failure mechanism was determined in armor welds joined with this process. Weld failure consistently occurred in the subcritical heat-affected zone where mechanical strain accumulation in softened martensitic parent material was superimposed upon the weld region containing the highest residual thermally induced strain.

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Numerical and experimental study of thermally induced residual stress in the hybrid laser–GMA welding process

Cited by 140 publications

References 17 publications

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

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

Numerical Simulation of Duplex Steel Multipass Welding

Correlation of Neutron-Based Strain Imaging and Mechanical Behavior of Armor Steel Welds Produced with the Hybrid Laser Arc Welding Process

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