NG-TIG welding technology research on 1/8 Sector of CFETR vacuum vessel

Ma, Jin; Wu, Ji; Liu, Zhihong; Ji, Haibiao; Fan, Xinmin

doi:10.1016/j.fusengdes.2020.111453

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…Compared with manual TIG welding, automatic NG-TIG welding greatly reduces the cross-sectional area of the groove, improves the efficiency of welding, reduces the range of the heat-affected zone, and significantly reduces the welding residual stress and deformation of the welded joint [15]. Based on the assembly structure of 1/8 VV mockup (figure 4), a NG-TIG welding system is designed, as shown in figure 9 [16]. In order to verify the feasibility of the system, the double shell welding experiment is carried out, as shown in figure 10.…”

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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“…In nuclear power, construction, and oil and gas pipeline fabrication, non-flat welding position welding is inevitable because it is difficult to adjust the position of structural parts [1,2]. In all-position welding, overhead welding position is particularly arduous.…”

Section: Introductionmentioning

confidence: 99%

Improving weld forming quality and process adaptability by using a copper liner in laser-MAG hybrid overhead welding

Han

Liu

Song

et al. 2023

Science and Technology of Welding and Joining

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During overhead welding, gravity inevitably drives the molten pool downward, resulting in poor adaptability and concave defect. To address this issue, this paper proposed a novel laser-MAG hybrid overhead welding technique utilising a copper liner (COL). Compared to single-arc welding, laser-MAG hybrid welding can reduce the volume of the molten pool, while the laser increases its support force. The COL can accelerate the molten pool's solidification rate. Additionally, the adhesion force between the molten pool and the COL can partially counterbalance gravity. As a result, good weld formation still was achieved even when the misalignment was 0-1 mm and the butt gap was 0-2 mm. Moreover, the back reinforcement height and width were not less than 0.71 and 3.66 mm, respectively.

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