Residual stress prediction in submerged arc welded spiral pipes

Forouzan, Mohammad Reza; Nasiri, S.M. Mirfalah; Mokhtari, Ali; Heidari, Ali; Golestaneh, Seyed Jafar

doi:10.1016/j.matdes.2011.04.016

Cited by 46 publications

(16 citation statements)

References 25 publications

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“…These parameters are obtained from experimental analysis of the fusion zone and are adjusted to create a desired melted zone according to the welding conditions. In addition, the moving coordinate system is assumed to be matched with the stationary coordinate C at time t = 0 for f i for i = f, rindicates the percentage of the total welding power Q in the front (f f ) or rear quarter (f r ) of the two ellipsoidal regions and is linearly related to the dimensions of these regions by Goldak [24,39,40]:…”

Section: Thermal Analysismentioning

confidence: 99%

Investigation of temperature and residual stresses field of submerged arc welding by finite element method and experiments

Nezamdost

Esfahani

Hashemi

et al. 2016

Int J Adv Manuf Technol

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This article reports on a numerical and experimental investigation to understand and improve computer methods in application of the Goldak model for predicting thermal distribution in submerged arc welding (SAW) of APIX65 pipeline steel. Accurate prediction of the thermal cycle and residual stresses will enable control of the fusion zone geometry, microstructure, and mechanical properties of the SAW joint. In this study, a new Goldak heat source distribution model for SAW is presented first. Both 2D and 3D finite element models are developed using the solution of heat transfer equations in ABAQUS Standard implicit. The obtained results proved that the 2D axi-symmetric model can be effectively employed to simulate the thermal cycles and the welding residual stresses for the test steel. As compared to the 3D analysis, the 2D model significantly reduced the time and cost of the FE computation. The numerical accuracy of the predicted fusion zone geometry is compared to the experimentally obtained values for bead-on-plate welds. The predictions given by the present model were found to be in good agreement with experimental measurements.

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Section: Thermal Analysismentioning

confidence: 99%

Investigation of temperature and residual stresses field of submerged arc welding by finite element method and experiments

Nezamdost

Esfahani

Hashemi

et al. 2016

Int J Adv Manuf Technol

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“…Como processo alternativo de fabricação para tubulações, vem sendo usado hoje o processo de fabricação de tubos com costura helicoidal por soldagem a arco submerso [11]. De acordo com Alobaidi e Sandgren [12] e Sadowski e Rotter [13], esse processo de fabricação reduz em muitas vezes o custo com transporte, além de possibilitar a fabricação contínua de tubos com tamanhos maiores do que os comercialmente produzidos.…”

Section: Soldagem Helicoidal De Tubos Produzida Em Campo Do Aço Astm unclassified

Soldagem Helicoidal de Tubos Produzida em Campo do Aço ASTM A-1018 e sua Correlação com Características Mecânicas e Microestruturais das Juntas Soldadas

et al. 2018

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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.Resumo: Um problema diversas vezes encontrado na produção de tubos está relacionado ao seu transporte dificultado por suas grandes dimensões. Atrelado a isso, a soldagem de campo é complexa e muitas vezes onerosa. Um processo de fabricação alternativo para tubulações é o processo de formação de tubos com costura helicoidal. Este trabalho propõe estudar as características microestruturais e realizar uma avaliação mecânica destas soldas executadas em campo do aço ASTM A1018. Para alcançar o objetivo do trabalho foram utilizados dois tubos de aço fabricados com chapas de espessura de 12,5 mm e diâmetro nominal de 1200 mm, através do equipamento adaptado para a soldagem em campo pelo processo de soldagem por arco submerso. Após soldagem dos tubos, foram retiradas amostras destes para efetuar as análises de micrografia, macrografia, composição química, dobramento e dureza. A principal diferença apresentada entre as amostras foi o aumento da ferrita acicular e redução da ferrita primária de contorno de grão com o decréscimo do aporte térmico nas microestruturas formadas tanto na zona fundida como na ZTA como apresentado. Observou-se, ainda, mudanças na geometria dos cordões de solda. Por fim, identificou-se que o principal parâmetro que influência nas mudanças microestruturais apresentadas é a corrente de soldagem. Palavras-chave: Tubos helicoidais; Soldagem por arco submerso; Caracterização microestrutural e mecânica.Abstract: A problem commonly found in the production of tubes is related to transportation due its large dimensions. This fact, makes field welding a complex and often costly operation.. An alternative fabrication process for pipes is the process of forming tubes with helical welds. This work proposes to study the microstructural characteristics and perform a mechanical evaluation of these welds performed in field of ASTM A1018 steel tubes. In order to reach the aim, two steel tubes manufactured from sheets with a thickness of 12.5 mm and a nominal diameter of 1200 mm were welded by the process of submerged arc welding through the equipment adapted for field welding. Subsequently, samples were taken to perform characterization by microanalysis. Chemical composition, bending and hardness tests were also conducted. The main difference between the samples was the increase of the acicular ferrite and reduction of the primary ferrite of the grain boundary with the decrease of the thermal contribution in the microstructures formed in the molten zone as in the ZTA as presented. Also, changes in the geometry of the weld beads were observed. Finally, it was identified that the main parameter that influences the microstructural changes presented is the welding current.

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“…However the perfect geometry of the [25] analysed spiral fabricated steel pipes under cyclic loading using a 'double-helix' mesh of shell finite elements and the CYNAS [26,27] finite element program, though the choice of mesh and its consequences were not discussed. In their study of predicted residual stress patterns in arc-welded spiral pipes, Forouzan et al [28] used ANSYS [23] to model the spiral pipe with a 'single-helix' mesh of distorted shell elements.…”

Section: Current Computer Modelling Of Cylinders With Helical Featuresmentioning

confidence: 99%

“…[28,33]). It is important to stress that this meshing method is intended solely for the modelling of imperfect cylindrical shells with significant geometric deviations that are helical in nature, and not as an alternative to the traditional modelling of perfect cylindrical shells with regular rectangular meshes.…”

Section: Introductionmentioning

confidence: 99%

Modelling and behaviour of cylindrical shell structures with helical features

Sadowski

Rotter

2014

Computers & Structures

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Spiral welding or bonding is a particularly efficient and cost-effective method of constructing continuous tubes. However the understanding of the mechanics of such structures is not yet well developed. This is in no small part due to the difficulties involved in their computational analysis.Cylindrical shells are traditionally modelled using rectangular finite elements oriented parallel to the meridional and circumferential axes. However, spiral features are particularly challenging to model because such features are not orthogonal to the axes of the cylinder. Commercial finite element pre-processors often struggle to mesh these with anything other than a free triangulation. A superior mesh would consist of wellconditioned rectangular elements oriented orthogonally with respect to the axes of the helix, termed a 'helical mesh', but this requires significant programming effort. A helical mesh is particularly important if features of the shell such as geometric imperfections, residual stresses, weld material and heat affected zones, and bonding in systems using adhesives are required to follow the helical form. Helically wound structural forms are widely used in different applications that demand continuous cylindrical forms. The most common uses in structural engineering are in spiral wound tubes, piles, chimneys and pipelines. This paper describes a powerful computational procedure developed by the authors to generate high quality helical meshes. Special emphasis is placed on the modelling of geometric deviations defined relative to the helix, appropriate for the analysis of spiral welded and stiffened tubes. The effect of helical meshing is illustrated using benchmark examples of perfect and imperfect cylinders under axial compression.Published in: Computers and Structures, 133C,[90][91][92][93][94][95][96][97][98][99][100][101][102]

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Residual stress prediction in submerged arc welded spiral pipes

Cited by 46 publications

References 25 publications

Investigation of temperature and residual stresses field of submerged arc welding by finite element method and experiments

Investigation of temperature and residual stresses field of submerged arc welding by finite element method and experiments

Soldagem Helicoidal de Tubos Produzida em Campo do Aço ASTM A-1018 e sua Correlação com Características Mecânicas e Microestruturais das Juntas Soldadas

Modelling and behaviour of cylindrical shell structures with helical features

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