Automatic Welding, 2023, №01



2023 №01 (03)

DOI of Article 10.37434/as2023.01.04

2023 №01 (05)

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Avtomaticheskaya Svarka (Automatic Welding), #1, 2023, pp. 22-28

Technologies for repairing of cathode unit of electron beam gun with the use of electron beam welding

V.I. Zagornikov, V.M. Nesterenkov, Yu.V. Orsa, A.M. Ignatenko

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The elements of repair technology of electron beam welding in the manufacture of a metal-ceramic cathode unit of a powerful welding electron beam gun are considered. A low degree of heat generation at the place of weld overlapping inherent in electron beam welding reduces the risk of buckling parts being joined and provides the maximum compliance with the required sizes of the unit. The need in repair of the cathode unit was determined by the cases of supplying imported insulators with defects in the form of deviations of a thickness from 0.5 to 1.0 mm in the wall of the metal flange («collar») in the brazed joint with the insulator. It was necessary to eliminate the consequences of a violation of the mechanical treatment of the insulator collar after brazing. The possible ways and schemes of repair technologies of such units are shown that allow avoiding the rejection of valuable parts and transferring them to the category of those subjected to restoration. The presented repair technologies involve the use of circumferential insertsbandages of different configuration for two variants to eliminate welding defects associated both with local repair of the edge as well as with repair of its quite elongated areas. Due to a correct choice of the shape of repair inserts, the use of some technological methods and observance of the accuracy of assembly and the sequence of repair welding, it became possible to preserve geometric dimensions and to ensure the functionality of the welded assembly as a whole. 6 Ref., 6 Tabl., 6 Fig.
Keywords: electron beam welding, pulsed mode, nickel alloy, cathode unit, repair circumferential shaped insert, schemes of joints of different welding stages


Received: 7.12.2022

References

1. Technological features of fusion welding. https://msd.com.ua
2. Features of fusion welding for electronic mechanical engineering. https://msd.com.ua › osobennosti-svarki-plavleniem-ma.
3. Nesterenkov, V.M., Zagornikov, V.I., Orsa, Yu.V., Ignatenko, O.M. (2020) Features of applying electron beam welding in manufacture of the cathode assembly of the electron gun. The Paton Welding J., 2, 33-37. https://doi.org/10.37434/as2020.02.06
4. Nesterenkov, V.M., Khripko,K.S., Matviichuk, V.A. (2018) Electron beam technologies of welding, surfacing, prototyping: Results and prospects. The Paton Welding J., 11-12, 126-133. https://doi.org/10.15407/tpwj2018.12.14
5. Makhnenko, O.V., Seyffarth, P. (2008) Calculation prediction of overall distortions in laser welded beams. The Paton Welding J., 3, 6-12.
6. Slobodyan, M. (2021) Resistance, electron and laser welding of zirconium alloys for nuclear power engineering. Yadernaya Inzheneriya i Tekhnologii, 53(4), 1049-1078 [in Russian]. https://doi.org/10.1016/j.net.2020.10.005

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