Weld distortion prediction of the CFETR vacuum vessel by inherent strain theory

Xiu, Lei; Wu, Ji; Liu, Zhihong; Ma, Jin; Fan, Xinping; Ji, Haibiao; Xia, Xiaowei; Li, Yanyan

doi:10.1016/j.fusengdes.2017.03.175

Cited by 23 publications

(7 citation statements)

References 6 publications

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“…In order to ensure the 1/8 VV mockup meets the final tolerance requirements, welding deformation control is of critical importance. The welding deformation can be reduced by using small deformation welding technology, adopting reasonable welding sequence, increasing the rigidity of welding structure and further minor provisions [6,14]. As a class-2 nuclear component, the quality and the magnetic permeability of the VV welds must be strictly controlled.…”

Section: Welding Deformation Controlmentioning

confidence: 99%

R&D achievements for vacuum vessel towards CFETR construction

Liu

et al. 2020

Nucl. Fusion

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The next generation of magnetic confinement fusion experimental facility, the China Fusion Engineering Test Reactor (CFETR), is currently undergoing physical and engineering design. The essential technology research and development projects related to CFETR manufacture are in progress. As one of the demo projects for CFETR R&D, a 1/8 full-scaled vacuum vessel (VV), which aims to solve the key technologies of forming, welding, measurement, assembly, etc in the future manufacturing process of VV, was initiated in 2015 by Institute of Plasma Physics Chinese Academy of Science (ASIPP). The fabrication of two full-scaled 22.5° toroidal sectors, which are composed of two 11.25° sectors, was successfully completed in June 2019. In the manufacturing process of the VV mockup, the progress has been made in the following six aspects: engineering design and safety evaluation of the VV mockup, the high-precision forming of the hyperbolic shell, the welding deformation control of 50 mm thick full penetration structure, the nondestructive testing of the complex welds by full volume covering, the establishment of high-precision 3D measurement fiducial network and the high-precision assembly of the VV parts. This article describes the progress and achievements of the above six aspects for the CFETR VV.

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Section: Welding Deformation Controlmentioning

confidence: 99%

R&D achievements for vacuum vessel towards CFETR construction

Liu

et al. 2020

Nucl. Fusion

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“…[5] Inherent strain consists of thermal strain ε th , plastic strain ε p , creep strain ε cr and phase transformation ε ph . [5], [13]. As some authors suggest, for low-carbon steel, because of small dilatation, ε cr and ε ph can be ignored.…”

Section: The Inherent Strain The-orymentioning

confidence: 99%

Review on distortion over welded structures

Iatan

Burlacu

2019

AnnUGalShipBuilding

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Since welding started to be used on a large-scale basis in engineering, distortion has become a stringent problem for the industry, mostly for shipyards. This paper aims at bringing together the result of large amount of research on distortion and mitigation techniques, in order to support further practical research on the topic. Phenomena, such as mostly used treatments for reducing distortion were explained in detail. In addition to this, inherent strain theory was presented for offering a starting point to those who shall perform thermal analysis in welded structures.

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“…The development of these welding deformation methodologies is summarized in Table 1. Ueda et al [3] Nomoto et al [4] Kim et al [5] Inherent strain-based 1990~C alculates an equivalent loading using inherent strain, elastic analysis Jang et al [6,7] Kim et al [8] Murakawa et al [9] Xiu et al [10] Liang et al [11] Kang et al [12] The elasticity method involves a simple welding experiment by changing the welding conditions and the dimensions of the work piece. After that, the factors affecting the welding deformation are summarized and the welding deformation is expressed using the equation for these factors.…”

Section: Introductionmentioning

confidence: 99%

“…Murakawa et al developed a model based on the inherent strain concept and iterative substructure method to calculate a large-scale welding problem [9]. Xiu et al calculated the weld strain of the vacuum vessel using the inherent strain method [10]. In accordance with the thermal load conditions, a modified inherent strain method was applied to the 3D printing field [11] or friction stir welding field [12].…”

Section: Introductionmentioning

confidence: 99%

A Study on Welding Deformation Prediction for Ship Blocks Using the Equivalent Strain Method Based on Inherent Strain

Kim

Kang

2019

Applied Sciences

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The welding process, which accounts for about 60% of the shipbuilding process, inevitably involves weld deformation. Considering this, productivity can be significantly increased if weld deformation can be predicted during the design phase, taking into account the fabrication order. However, the conventional welding deformation prediction method using thermo-elasto-plastic analysis requires a long analysis time, and the welding deformation prediction method using equivalent load analysis has a disadvantage in that the welding residual stress cannot be considered. In this study, an inherent strain chart using a solid-spring model with two-dimensional constraints is proposed to predict the equivalent strain. In addition, the welding deformation prediction method proposed in this study, the equivalent strain method (ESM), was compared with the ship block experimental results (EXP), elasto-plastic analysis (EPA) results, and equivalent load analysis (ELM) results. Through this comparison, it was found that the application of the equivalent strain method made it possible to quickly and accurately predict weld deformation in consideration of the residual stress of the curved double-bottom block used in the shipyard.

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Weld distortion prediction of the CFETR vacuum vessel by inherent strain theory

Cited by 23 publications

References 6 publications

R&D achievements for vacuum vessel towards CFETR construction

R&D achievements for vacuum vessel towards CFETR construction

Review on distortion over welded structures

A Study on Welding Deformation Prediction for Ship Blocks Using the Equivalent Strain Method Based on Inherent Strain

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