Modelling of addition of filler material in large deformation analysis of multipass welding

Lindgren, Lars‐Erik; Hedblom, Erika

doi:10.1002/cnm.414

Cited by 65 publications

(37 citation statements)

References 12 publications

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“…A relatively straightforward and easy to implement by utilizing the ANSYS ® embed features of element birth and death, conventional quite element technique [20] is used in the present work. The whole FE model is generated in the start, however; all the elements representing filler metal are deactivated by assigning them very low conductivity.…”

Section: Thermal Analysis Techniquementioning

confidence: 99%

Analysis of weld-induced residual stresses and distortions in thin-walled cylinders

2009

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Circumferential weld specifically in thin-walled structures is a common joint type in the fabrication of structural members in aerospace, aeronautical and pressure vessel industries. This type of weld joint suffers various types of weld-induced residual stress fields (hoop and axial) and deformation patterns (axial shrinkage, radial shrinkage). These imperfections have negative effects on fabrication accuracies and result in low strength welded structures that can lead to premature failures. To precisely capture the distortions and residual stresses, computational methodology based on three-dimensional finite element model for the simulation of gas tungsten arc welding in thin-walled cylinders is presented. Butt-weld geometry with single "V" for a 300 mm outer diameter cylinder of 3 mm thick is used. The complex phenomenon of arc welding is numerically solved by sequentially coupled transient, non-linear thermo-mechanical analysis. The accuracy of both the thermal and structural models is validated through experiments for temperature distribution, residual stresses and distortion. The simulated result shows close correlation with the experimental measurements.

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Section: Thermal Analysis Techniquementioning

confidence: 99%

Analysis of weld-induced residual stresses and distortions in thin-walled cylinders

2009

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“…It extends the work in [33], which implemented a logic for versatile description of the weld path leading to heat input in the finite element model. It also advances the approach in [34] to the three-dimensional context.…”

Section: Computational Welding Mechanicsmentioning

confidence: 98%

“…The basic ideas in this work are taken from Lindgren and Hedblom [34]. They modelled multipass welding in 2D in an elegant way, especially regarding the addition of material.…”

Section: Addition Of Filler Materialsmentioning

confidence: 99%

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Modelling of metal deposition

Lundbäck

Lindgren

2011

Finite Elements in Analysis and Design

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112

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“…For instance, Lindgren and Hedblom [31] presented a strategy based on minimizing a function that measures element distortion, added volume and smoothness of the external boundary to compute the new nodal positions.…”

Section: Remarksmentioning

confidence: 99%

Computational modelling of shaped metal deposition

Anca

Fachinotti

Escobar‐Palafox

et al. 2010

Numerical Meth Engineering

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SUMMARYShaped metal deposition (SMD) is a novel process for rapid prototyping that employs tungsten inert gas (TIG) welding controlled by a robot inside an inert gas chamber to build parts by successive layer deposition. This process can be enhanced through modelling and control. Industries are interested in developing systematized models to explain observed phenomena and to predict processing conditions for process planning and optimization. In this work, thermal and mechanical finite element (FE) modelling of SMD is presented. The thermal problem is solved with linear tetrahedral finite FEs that take into account the liquid/solid phase change phenomenon. The mechanical problem is solved with hexahedral elements with tri-linear interpolation of displacements and constant interpolation of mean stresses (Q1-P0). Special techniques to account for material addition were developed, based on activation/deactivation of FEs. Numerical tests were conducted to determine the heat source model parameters. An experiment using Ti-6Al-4V material was developed to validate the formulation. The test consisted of a TIG-wash procedure (arc passing without wire feeding to preheat the plate) followed by a single welding layer. The results, including temperatures and residual displacements, are compared with those obtained with the finite element method (FEM) code. Finally, a multilayer SMD numerical example is presented.

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Modelling of addition of filler material in large deformation analysis of multipass welding

Cited by 65 publications

References 12 publications

Analysis of weld-induced residual stresses and distortions in thin-walled cylinders

Analysis of weld-induced residual stresses and distortions in thin-walled cylinders

Modelling of metal deposition

Computational modelling of shaped metal deposition

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