A study of the influence of electron beam welding sequences on the ITER vacuum vessel prototype VATS

Guirao, J.; Rodríguez, Eduardo; Bayón, A.; Cortizo, J. L.; Jones, L.

doi:10.1016/j.fusengdes.2011.04.015

Cited by 15 publications

(5 citation statements)

References 14 publications

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“…The inboard segment prototype employed only full penetration 60 and 40 mm EB welding without any restraining jigs of the assembly during welding. The weld sequence was optimized for minimum distortion by ANSYS modeling (see Section 7) [7]. The 6.2 m long linear welds were made with full penetration EB welding in HV position with excellent quality.…”

Section: Pre-production Prototypesmentioning

confidence: 99%

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Manufacturing preparations for the European Vacuum Vessel Sector for ITER

Jones

Arbogast

Bayón

et al. 2012

Fusion Engineering and Design

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Section: Pre-production Prototypesmentioning

confidence: 99%

“…In order to achieve the tolerances without a full prototype, the manufacturing route must rely on ANSYS welding distortion analysis [8]. The VV sector distortions are not controlled with the use of stiff jigs, but by calculation and pre-compensation.…”

Section: Weld Distortion Controlmentioning

confidence: 99%

Manufacturing preparations for the European Vacuum Vessel Sector for ITER

Jones

Arbogast

Bayón

et al. 2012

Fusion Engineering and Design

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“…More recently, the influence of welding sequences on welding stresses and distortions has been investigated on the International Thermonuclear Experimental Reactor (ITER) vacuum vessel using finite element models. For example, the influence of electron-beam welding sequences on the ITER vacuum vessel prototype VATS was examined by Guirao et al [20], and it was found that the distortion simulation could optimize the welding sequences to achieve tight tolerances and obtain low distortion components. Martín-Menéndez et al [21] studied the influence of electron-beam welding sequences on ITER vacuum vessel for a fixed manufacturing route using finite element simulation, and observed that the welding sequences had a more significant influence in a lowly constrained assembly than in a highly constrained one.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Tungsten Inert Gas Welding Sequences on Residual Stress and Distortion of CFETR Vacuum Vessel Using Finite Element Simulations

Zhang

Liu

et al. 2018

Metals

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The as-welded sectors of China Fusion Engineering Testing Reactor (CFETR) vacuum vessel (VV) have very tight tolerances. However, it is difficult to investigate the welding stress and distortion without the production of a full-scale prototype. Therefore, it is important to predict and reduce the welding stress and distortion to guarantee the final assembly by using an accurately adjusted finite element model. In this paper, a full-scale finite element model of the 1/32 VV mock-up was built by ABAQUS which is a powerful finite element software for engineering simulation, and three different tungsten inert gas (TIG) welding sequences were simulated to study the effect of welding sequences on the welding stress and distortion. The results showed that the main welding stress happened on the weld zone, and the maximum distortion occurred on the shell near the welding joints between the inboard segment (PS1) and the lower segment (PS4). The inboard segment (PS1), upper segment (PS2), and lower segment (PS4) distorted to inside of the shell perpendicularly, while the equatorial segment (PS3) distorted to outside of the shell perpendicularly. According to the further analysis, the maximum welding stresses in sequence 1, sequence 2, and sequence 3 were 234.509 MPa, 234.731 MPa, and 234.508 MPa, respectively, and the average welding stresses were 117.268 MPa, 117.367 MPa, and 117.241 MPa, respectively, meanwhile, the maximum welding displacements in sequence 1, sequence 2, and sequence 3 were 1.158 mm, 1.157 mm, and 1.149 mm, respectively, and the average welding displacements were 1.048 mm, 1.053 mm, and 1.042 mm, respectively. Thus, an optimized welding sequence 3 was obtained and could be applied to the practical assembly process of the 1/32 VV mock-up.

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“…TBM distortion optimization is evoked in the literature [2][3][4] and is treated only at a local scale on elementary and small components. Nevertheless, in ITER framework, distortion studies at the global component scale were carried out on a vacuum vessel sector [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Assessment of HCLL-TBM optimum welding sequence scenario to minimize welding distortions

Doyen

Rizzo

Forest

et al. 2017

Fusion Engineering and Design

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The ITER HCLL-TBM (Helium Cooled Lithium Lead Test Blanket Module) box assembly development implies the welding development of the following components: the Box and the Stiffening Grid (SG) made of vertical and horizontal Stiffening Plates (noted respectively v-SP and h-SP). This multi-chamber box structure in EUROFER97 steel is made of plates cooled by multiple meandering channels where circulates pressurized helium. For the assembly of these components, characterized by numerous multipass welds, Gas Tungsten Arc Welding (GTAW) is envisaged as reference process. Moreover, the TBM has large dimensions and thin plates which makes it very sensitive to welding distortions and is problematic regarding the assembly feasibility and compliance with geometric tolerances. This paper presents the numerical simulation and experimental work performed to optimize the v-SP to box assembly sequence, which is the most critical assembly regarding distortions, in order to minimize welding distortions. One of the technical lock of this study is high calculation times needed for this large component which implies to set up a simplified welding simulation method. The study is composed of three main phases: an experimentalnumerical study of a T-joint fillet mock-up GTAW used to develop the preliminary welding procedure and to validate a simplified simulation method, a numerical optimization of the v-SP to box welding sequence via the simplified method, and the experimental application of the optimized v-SP to Box welding sequence on the TBM mock-up. The calculation and comparison of four different v-SP to box welding sequences allowed to identify the best sequence regarding welding distortions and to apply it experimentally.

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A study of the influence of electron beam welding sequences on the ITER vacuum vessel prototype VATS

Cited by 15 publications

References 14 publications

Manufacturing preparations for the European Vacuum Vessel Sector for ITER

Manufacturing preparations for the European Vacuum Vessel Sector for ITER

Analysis of the Effect of Tungsten Inert Gas Welding Sequences on Residual Stress and Distortion of CFETR Vacuum Vessel Using Finite Element Simulations

Assessment of HCLL-TBM optimum welding sequence scenario to minimize welding distortions

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