|2020 №08 (05)||DOI of Article
|2020 №08 (07)|
TPWJ, 2020, #8, 34-40 pages
Pequliarities of formation of dissimilar nickel-base alloy joints in friction welding
I.V. Ziakhor, M.S. Zavertannyi, A.M. Levchuk and L.M. Kapitanchuk
E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: firstname.lastname@example.org
When creating new designs of aircraft gas turbine engines, the urgent task is to replace the mechanical fasteners of structural elements from high-temperature nickel alloys with 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 wrought alloy EI698VD and casting alloy VZhL12U. The minimum values of pressure, at which upsetting is provided (deformation of billets in macrovolumes) are determined. The critical value of pressure, exceeding which leads to a change in the nature of the upsetting process in friction welding of EP741NP and VZhL12U alloys — from uniform shortening of the billets to stepwise. The range of changes in technological parameters of friction welding process, which ensures formation of defect-free welded joints, is determined. Microhardness studies have shown absence of areas with reduced microhardness in the zone of the joint of EP741NP and VZhL12U alloys. 22 Ref., 2 Tables, 11 Figures.
Keywords: friction welding, high-temperature nickel-base alloys, deformation, γ′-phase
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