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2020 №12 (03) DOI of Article
10.37434/as2020.12.04
2020 №12 (05)

Automatic Welding 2020 #12
Avtomaticheskaya Svarka (Automatic Welding), #12, 2020, pp. 30-36

Development of remotely-controlled equipment and technology for laser welding and restoration of performance of NPS steam generators

V.D. Shelyagin, A.V. Bernatskyi, O.V. Siora, V.A. Kurilo, O.M. Suchek
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Control straight butt joints of 10Kh18N10T and 10Kh17N13M3T steel blanks were welded in the vertical position with incomplete penetration by the thickness. Visual and radiographic examination, and metallographic investigations were performed, and welded joint microhardness was determined. Parameters of technological welding modes of the studied circumferential welded joints were established. Conditions of compliance with quality category «high B» of DSTU EN ISO 13919–1:2015 standard were the criterion for selection of appropriate parameters of the modes of laser welding of circumferential butt joints. As a result of work performance, it is shown that the point of welding start influences the dimensions of the weld section, in which the welding process is stabilized, and specified penetration depth is achieved. The techniques developed by the authors were verified on simulator-samples during experimental-industrial trials of the prototype of remotely-controlled equipment developed for repair and restoration of performance of PGV-1000М type steam generators. 18 Ref., 2 Tabl., 9 Fig.
Keywords: repair of NPS generators, heat-exchanger tubes, laser welding, technology, equipment


Received: 11.11.2020

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