New electrodes for repair surfacing of damaged lining of impeller chamber of hes hydropower units

Yushchenko, K. A.; Kakhovsky, Yu.N.; Bulat, A.V.; Samojlenko, V.I.; Kakhovsky, N.Yu.

doi:10.15407/tpwj2015.06.20

Cited by 1 publication

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“…5). As shown by earlier studies [2,3,4], welding dissimilar joints from steels of different structural classes, pearlite with austenite, as a result of mixing of the filler and base metals at the fusion boundary crystallization layers of variable composition are formed, containing, 3...12 wt.% Chromium and 2...8 wt.% Nickel. Mostly, they have a martensitic structure, which reduces the performance of the welded joint due to the low ductility of the transition layer.…”

Section: Obtained Resultsmentioning

confidence: 84%

Technology of welding and repair works of hydropower plants units

Kakhovskyi¹,

Kakhovskyi²,

Ievdokymenko³

2021

Mech. Adv. Technol.

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In the course of long-term operation of hydroelectric units, they are subject to wear and tear, which negatively affects the power generating capacity of the hydroelectric power station. The existing repair technology provides the restoration of the geometric dimensions of the impeller chamber of the hydraulic unit using an austenitic cladding layer. However, this technology is characterized by the occurrence of cracks and delamination of the deposited layer during post-repair operation, which is negatively reflected in the production cycle of electricity. A new technology and welding consumables have been proposed for repair and restoration works of hydroelectric units at hydroelectric power plants, providing an increase in the quality level, high characteristics of hydroabrasive and cavitation resistance, and increasing of working period of hydroelectric power plants. Inspection of the body of the hydraulic unit was carried out, defects were identified and classified, the reasons for their occurrence were analyzed. The research results make possible to optimize the alloying system of the deposited metal, to determine the optimal welding mode, to reduce the amount of the martensite component and to develop new filler materials and the technology for welding and repair works of hydroelectric power plants.

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Section: Obtained Resultsmentioning

confidence: 84%