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2020 №02 (08) DOI of Article
2020 №02 (02)

Electrometallurgy Today 2020 #02
SEM, 2020, #2, 3-9 pages

Investigation of the technological features and admissible pressures of the process of vacuum ESR

I.V. Protokovilov, D.A. Petrov, V.B. Porokhonko
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 paper presents the results of experimental studies of the features of vacuum electroslag remelting process at remelting of steel and titanium consumable electrodes in a chamber-type electroslag furnace, using fluoride-oxide and salt fluxes. It was found that pressure lowering in the furnace melting space results in decrease of melting current, increase of its oscillation amplitude and subsequent violation of the stability of the electroslag process, caused by slag pool boiling. It was determined that the critical pressure level, at which pool boiling occurs, depends on flux composition and electric modes, determining the power of the ESR process. For salt fluxes of AN-T1 and AN-T4 type, the critical pressure level is equal to approximately 12...22 and 15...26 kPa, respectively, and for ANF-1, ANF-6, ANF-28 fluoride-oxide fluxes it is 3...15 kPa. It is shown that the higher is the remelting power, the higher the pressure, at which flux boiling occurs. Ref. 12, Tabl. 1, Fig. 5.
Keywords: electroslag remelting; chamber furnace; vacuum; flux; boiling; melting current; voltage

Received 16.03.2020


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