Manufacturing preparations for the European Vacuum Vessel Sector for ITER

Jones, L.; Arbogast, Jean François; Bayón, A.; Bianchi, A.; Caixas, Joan; Facca, Aldo; Fachin, Gianbattista; Fernández, J.F.; Giraud, B.; Losasso, M.; Löwer, Thorsten; Mico, G.; Pacheco, Jardel Pizzatto; Paoletti, Roberto; Sanguinetti, G.P.; Stamos, V.; Tacconelli, Massimiliano; Trentea, Alexandru; Utin, Yuri

doi:10.1016/j.fusengdes.2012.02.007

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…Eleven checkpoints were selected at the upper surface of the coupon to compare with the simulated vertical deformation, as shown in Figure 5b. The detailed measured process was as follows (as shown in Figure 5c): (1) measuring the distance between the bottom surface and horizontal line, d1; (2) measuring the distance between the bottom surface and the upper surface, d2; (3) vertical distortion Z = d1 − d2. voltage was 20 KV, the current was 4 mA, the exposure time was 10 s, and the spot size was 3mm.…”

Section: Measurement Of Welding Stresses and Distortions Of The Couponmentioning

confidence: 99%

“…The 1/32 VV mock-up of CFETR is manufactured from four poloidal segments (PS), including inboard segment (PS1), upper segment (PS2), equatorial segment (PS3), and lower segment (PS4), as shown in Figure 1. In order to guarantee the final assembly with the other vacuum vessel sectors suitably, the overall profile of the 1/32 VV mock-up must have tight tolerances [2]. However, it is difficult to achieve a tight tolerance due to the nature of the austenitic steel 316LN (ITER Grade), which is chosen as the raw material of the CFETR vacuum vessel.…”

Section: Introductionmentioning

confidence: 99%

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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.

show abstract

Section: Measurement Of Welding Stresses and Distortions Of The Couponmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…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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Project management techniques used in the European Vacuum Vessel sectors procurement for ITER

Losasso

Zuniga

Jones

et al. 2012

Fusion Engineering and Design

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Manufacturing preparations for the European Vacuum Vessel Sector for ITER

Cited by 8 publications

References 9 publications

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

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

Project management techniques used in the European Vacuum Vessel sectors procurement for ITER

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