Automatic Welding, 2022, №01



2022 №01 (04)

DOI of Article 10.37434/as2022.01.05

2022 №01 (06)

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Avtomaticheskaya Svarka (Automatic Welding), #1, 2022, pp. 33-40

Mathematical modeling of residual stresses in composite welded joints of WWER-1000 reactor vessel cover with CPS nozzles

A.A. Makarenko, O.V. Makhnenko

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 composite welded joints of the WWER-1000 reactor vessel cover with the nozzles of the control and protection system (CPS) are the object of the strength calculation when justifying the extension of the service life of NPP units. Mathematical modeling by the finite element method of the kinetics of residual stress formation during welding of the WWER-1000 reactor vessel cover with CPS nozzles and their redistribution as a result of post-welding heat treatment was performed. The effect of preheating on the microstructural phase transformations in HAZ of the main material of the cover and the nozzle was studied. The main features of the distribution of residual stresses in the composite welded joints after welding and heat treatment are determined. 14 Ref., 1 Tabl., 12 Fig.
Keywords: composite welded joint, reactor vessel cover, WWER-1000, HAZ, microstructural phase transformations, residual stresses, heat treatment, mathematical modeling


Received: 20.10.2021

References

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