The influence of TIG-Arc physical characteristics on the penetration and weld width under different Ar and He supply conditions

Dai, Hongzhe; Shen, Xiuqiang; Wang, Haoran

doi:10.1016/j.rinp.2018.04.030

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…Welding used for joining Cu tube is done by Tungsten-inert-gas (TIG) welding technique with the φ1.0 mm ERCu as the filler material. TIG welding is one of the most important welding methods, which uses a single, binary or multivariate mixture gas as shielding gas [5]. Table 2 shows the chemical composition of the filler material.…”

Section: Materials and Preparationmentioning

confidence: 99%

Research and development of copper joint for ITER In-Vessel Coils

et al. 2023

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The ITER In-Vessel Coils (IVCs) are crucial components of the Tokamak fusion reactor. They are located within the Vacuum Vessel (VV) behind the Blanket Shield Modules (BSM) and are responsible for compensating for fast perturbations of the plasma. There are a total of 176 joints used to connect the IVCs, feeders and feedthrough. The joint structure consists of a central copper conductor, a mineral (MgO) insulation layer, and an outer stainless-steel jacket. Given the inaccessibility of the IVCs once the Blanket Modules are installed, the highest level of quality is required for the joints. One key item is the welding of the copper conductor which has to be done inside the VV. To address the high thermal conductivity of copper conductor and the challenging constraints working inside the VV, a preheating method by the arc of the welding head has been developed. Macro- and micro-structure examination were performed on the welding cross sections, and tensile tests were carried out to check the strength of the copper joint, which demonstrated that arc preheating does not have a significant impact on the heat-affected zone. After more than 40 welding attempts and several design updates, the copper joint has been successfully developed and can be repeatedly and successfully welded.

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Section: Materials and Preparationmentioning

confidence: 99%

Research and development of copper joint for ITER In-Vessel Coils

et al. 2023

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“…Regarding the research on the use of argon and helium alternate gas supply in the welding process, many scholars have focused on researching and analysing the arc characteristics. Dai et al [13] observed the arc shape of the alternating gas supply of argon and helium with a high-speed camera, and they recorded the arc current distribution under different gas flow ratios. Dai et al [14] also studied the radial distribution of arc force under alternating air supply by the watercooled copper plate test method.…”

Section: Introductionmentioning

confidence: 99%

“…Dai et al. [13] observed the arc shape of the alternating gas supply of argon and helium with a high-speed camera, and they recorded the arc current distribution under different gas flow ratios. Dai et al.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and properties of TIG welded 5A06-Al: responses to variable Ar-He alternating supplying conditions

Dai

Miao

Nie

et al. 2022

Science and Technology of Welding and Joining

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During the TIG welding process, the interactions between arc plasma and molten pool could be periodically influenced by supplying Ar-He shield gas alternatively, which would affect the solidification and forming of the weld metal. In this work, the responses of microstructures and mechanical properties of the TIG welded 5A06 joint to the variable Ar-He alternating supplying conditions were investigated systematically. The variable shielding gas supply had a grain refining effect on the weld seam due to more violent and impacting effect on the molten pool. Moreover, the number of strengthening phases increased and became more dispersed, which increased the tensile strength further. The electrochemical experiment showed that the weld seam under continuous gas supply had better corrosion resistance.

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