Fast three-dimensional multipass welding simulation using an iterative substructure method

Maekawa, Akira; Kawahara, Atsushi; Serizawa, Hisashi; Murakawa, Hidekazu

doi:10.1016/j.jmatprotec.2014.08.004

Cited by 33 publications

(8 citation statements)

References 30 publications

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“…The heat source dimensions are adjusted by weld bead macrography [15][16][17]. FEM has also been used to simulate multipass welding to solve these same questions, however, the previous HAZ reheating through subsequent welding pass is not evaluated [18][19][20][21][22]. Single pass welding simulation is a costly operation for the FEM, the more expensive it will be for multipass welding simulation [18,23].…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Simulate HSLA Steel Multipass Welding through Distributed Point Heat Sources Model

Ferreira

Alves

Neto

et al. 2018

Metals

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Mechanical properties of welded joints depend on the way heat flows through the welding passes. In multipass welding the reheating of the heat affected zone (HAZ) can form local brittle zones that need to be delimited for evaluation. The difficulty lies in the choice of a model that can simulate multipass welding. This study evaluated Rosenthal’s Medium Thick Plate (MTP) and the Distributed heat Sources (DHS) of Mhyr and Gröng models. Two assumptions were considered for both models: constant and temperature-dependent physical properties. It was carried out on a multipass welding of an API 5L X80 tube, with 1016 mm (42″) external diameter, 16 mm thick and half V-groove bevel, in the 3G up position. The root pass was welded with Gas Metal Arc Welding (GMAW) process with controlled short-circuit transfer. The Flux Cored Arc Welding (FCAW) process was used in the filling and finishing passes, using filler metal E111T1-K3M-JH4. The evaluation criteria used were overlapping the simulated isotherms on the marks revealed in the macrographs and the comparison between the experimental thermal cycle and those simulated by the proposed models. The DHS model with the temperature-dependent properties presented the best results and simulated with accuracy the HAZ of root and second welding passes. In this way, it was possible to delimit the HAZ heated sub-regions.

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Section: Introductionmentioning

confidence: 99%

A New Approach to Simulate HSLA Steel Multipass Welding through Distributed Point Heat Sources Model

Ferreira

Alves

Neto

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…As for the thermal elastic-plastic finite element analyses, an in-house code was employed based on ISM (Iterative Substructure Method) [15,16] in this research, and the accuracy of our code is already revealed through the comparison with not only experiments but also other commercial codes, where the element type was set as linear [4,17,18]. In order to demonstrate the multi-pass welding numerically, the elements representing the filler metal in the groove were deactivated before the welding, and when the weld bead was deposited, the corresponding elements were activated [12].…”

Section: Methods For Analysismentioning

confidence: 99%

Finite element analysis of deformation in early stage of multi-pass circumferential dissimilar welding of thick-walled pipes with narrow gap

2016

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Three-dimensional thermal elastic-plastic finite element analyses were conducted in order to reveal the mechanism of gap shrinkage in early stage of multi-pass narrow gap welding of thick-walled dissimilar pipes and thick plates. The gap shrinkage up to the 8th pass indicates that the shrinkage of plates becomes to be much larger than that of pipes with increasing the weld passes. In addition, through the decomposition of gap shrinkage to transverse shrinkage and angular distortion, it is found that the gap shrinkage of pipes is mainly governed by the transverse shrinkage, while the shrinkage of plates is influenced by both the transverse shrinkage and angular distortion. Moreover, the serial computational results with various groove shapes suggest that the transverse shrinkage of pipes almost linearly increases with increasing the weld pass, and its increment can be predicted by a linear approximation function obtained by the transverse shrinkage of plates regardless of the groove shape.

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“…In the high temperature state of metals, the dislocations accumulated due to plastic deformation are thought to disappear even if the metals do not melt. This effect can be modeled by setting equivalent plastic strain of elements to zero [13]. In this research, equivalent plastic strain and back stress of kinematic hardening are set to zero when the temperature of the element exceeds the annealing temperature of 900°C [12].…”

Section: Analysis Model and Conditionsmentioning

confidence: 99%

Development of idealized explicit FEM using GPU parallelization and its application to large-scale analysis of residual stress of multi-pass welded pipe joint

2015

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In this research, the authors developed the idealized explicit finite element method (IEFEM) to achieve shorter computing time and lower memory consumption in analyses of welding deformation and residual stress. IEFEM was parallelized by a graphics processing unit (GPU) to achieve even faster computation. To show its applicability to largescale problems, the proposed method was applied to the analysis of the multi-pass welding of V-groove pipe joint that has 1 million elements, 13 layers, and 33 passes. In the analysis, isotropic hardening, kinematic hardening, and combined hardening were considered to investigate the influence of hardening rule on residual stress distribution. As a result, it is found that residual stress distributions were larger in the order of isotropic hardening, combined hardening, and kinematic hardening. In addition, the analyzed residual stress and experimental measurements showed good agreement. The computing time was approximately 70 h. From these results, it was shown that IEFEM can analyze a large-scale welding residual stress problem in realistic time with high accuracy.

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Fast three-dimensional multipass welding simulation using an iterative substructure method

Cited by 33 publications

References 30 publications

A New Approach to Simulate HSLA Steel Multipass Welding through Distributed Point Heat Sources Model

A New Approach to Simulate HSLA Steel Multipass Welding through Distributed Point Heat Sources Model

Finite element analysis of deformation in early stage of multi-pass circumferential dissimilar welding of thick-walled pipes with narrow gap

Development of idealized explicit FEM using GPU parallelization and its application to large-scale analysis of residual stress of multi-pass welded pipe joint

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