The Paton Welding Journal, 2021, №06



2021 №06 (01)

DOI of Article 10.37434/tpwj2021.06.02

2021 №06 (03)

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The Paton Welding Journal, 2021, #6, 12-18 pages

Welding dissimilar high-strength nickel alloys in poly- and single-crystal combinations

K.A. Yushchenko, B.O. Zaderii, I.S. Gakh and G.V. Zviagintseva

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
The paper deals with an important question, which arises at designing and improvement of the structure of gas turbine engines, in order to increase the operating parameters, cost characteristics and competitiveness: welding of dissimilar, multistructural high-temperature materials. Weldability assessment by the criteria of strength and crack resistance was performed. The main questions arising in welding high-temperature nickel alloys in dissimilar combinations: welding method, features of weld formation, chemical composition and structure, cracking susceptibility of welded joints and mechanical properties, are considered in the case of welding typical high-temperature materials widely used in aircraft engine building, namely EI698VD and ZhS26VI alloys with polycrystal and single-crystal structure, respectively. Methods to control the technological strength are established. Mechanical properties of welded joints produced in the temperature range of 20–1000 °C by different technology schemes are determined. 15 Ref., 5 Table, 7 Figures.
Keywords: high-temperature nickel alloys, welding of dissimilar alloys, weld formation, chemical composition, single-crystal and polycrystal structure, crack resistance, properties

Received 19.04.2021

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