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2020 №08 (05) DOI of Article
2020 №08 (07)

Automatic Welding 2020 #08
Avtomaticheskaya Svarka (Automatic Welding), #8, 2020, pp. 38-44

Pequliarities of formation of joints of dissimilar high-temperature nickel-base alloys in friction welding

I.V. Ziakhor, M.S. Zavertannyi, A.M. Levchuk, L.M. Kapitanchuk
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

When creating new designs of aircraft gas turbine engines, the urgent task is to replace the mechanical fasteners of elements of a structure from high-temperature nickel superalloys (NSA) by welded joints. The paper presents the results of research on the processes of heating, deformation and formation of the structure of joints during friction welding (FW) of dissimilar alloys: granular alloy EP741NP with forged alloy EI698VD and cast alloy VZhL12U. The minimum values of pressure, at which the shortening is provided (deformation of workpieces in macrovolumes) were determined. A critical value of pressure was established, in excess of which there is a change in the nature of the shortening process in FW of alloys EP741NP and VZhL12U – from uniform to stepwise shortening of the workpieces. The range of change of the technological parameters of FW process is determined, in which formation of defect-free welded joints is ensured. Microhardness studies showed absence of areas with reduced microhardness values in the zone of FW joints of EP741NP and VZhL12U alloys. 22 Ref., 2 Tabl., 11 Fig.
Keywords: friction welding, high-temperature nickel-base alloys, deformation, γ`-phase

Received: 13.07.2020


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