In-process control of ITER vacuum vessel PS1 welding jig by means of FEM simulation and welding distortion analysis

D’Amico, Gabriele; Caixas, Joan; LoBue, A.; Bayón, A.

doi:10.1016/j.fusengdes.2019.03.048

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…The second one was tight manufacturing tolerances for a huge welded heavy structure having a total of 1.4 km welding lengths approximately [9,10]. Especially, tight tolerances are defined on the flexible supporting housings (FSH) for assembly with the blanket shield blocks (BSBs) which are position 8 mm for the body part and 4 mm for the edge part, and on the ITER site joint bevel root face is given profile 6 mm for assembly with the other sectors as shown in figure 3.…”

Section: Challenge-2: Tight Tolerance Requirementmentioning

confidence: 99%

Manufacturing completion of the first ITER vacuum vessel sector

et al. 2022

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In April 2020, manufacturing of the ITER vacuum vessel (VV) 1st sector has been completed by Korea domestic agency (KODA) since manufacturing started in February 2012. The ITER VV sector is the largest fusion VV structure in the world. Each step of the manufacturing was challenged as a first-of-a-kind (FOAK), and a French nuclear pressure vessel. The paper provides an overview of the major challenges which were overcome over the last 10 years.

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Section: Challenge-2: Tight Tolerance Requirementmentioning

confidence: 99%

Manufacturing completion of the first ITER vacuum vessel sector

et al. 2022

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“…Various constructional and technological methods can be used to reduce the adverse impact of welding stresses and deformations on the structure being produced. Currently, the most important methods of reducing welding distortion are [7][8][9][10][11][12][13][14][15][16][17][18]: pre-welding, in transient welding distortion, and post-welding distortion prevention method. As a rule, the pre-welding distortion prevention method uses properly designed welding guns.…”

Section: Introductionmentioning

confidence: 99%

“…Figure18. Test sample after TIG welding (method 141) after innovative preparation of a hole with a flange: photo of the real object (a), virtual model after 3D scanning with the ATOS III scanner with measurement results (b).…”

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confidence: 99%

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

et al. 2021

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The article presents an innovative method of reducing welding distortions of thin-walled structures by introducing structural and technological changes. The accuracy of the method was demonstrated on the example of welding the stub pipes to the outer surface of a thin-walled tank with large dimensions, made of steel 1.4301 with a wall thickness of 1.5 × 10−3 (m). During traditional Gas Tungsten Arc Welding (GTAW), distortions of the base are formed, the flatness deviation of which was 11.9 × 10−3 (m) and exceeded the permissible standards. As a result of structural and technological changes, not only does the joint stiffness increase, but also a favorable stress state is introduced in the flange, which reduces the local welding stresses. Numerical models were developed using the finite element method (FEM), which were used to analyze the residual stresses and strains pre-welding, in extruded flanges, in transient, and post-welding. The results of the calculations for various flanges heights show that there is a limit height h = 9.2 × 10−3 (m), above which flange cracks during extrusion. A function for calculating the flange height was developed due to the required stress state. The results of numerical calculations were verified experimentally on a designed and built test stand for extrusion the flange. The results of experimental research confirmed the results of numerical simulations. For further tests, bases with a flange h = 6 × 10−3 (m) were used, to which a stub pipe was welded using the GTAW method. After the welding process, the distortion of the base was measured with the ATOS III scanner (GOM a Zeiss company, Oberkochen, Germany). It has been shown that the developed methodology is correct, and the introduced structural and technological changes result in a favorable reduction of welding stresses and a reduction in the flatness deviation of the base in the welded joint to 0.39 × 10−3 (m), which meets the requirements of the standards.

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Integrated optimization of process control and its effect on structural integrity – A systematic review

Szentannai

Fekete

2022

Engineering Failure Analysis

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In-process control of ITER vacuum vessel PS1 welding jig by means of FEM simulation and welding distortion analysis

Cited by 8 publications

References 6 publications

Manufacturing completion of the first ITER vacuum vessel sector

Manufacturing completion of the first ITER vacuum vessel sector

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

Integrated optimization of process control and its effect on structural integrity – A systematic review

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