The Paton Welding Journal, 2026, №10

2026 №10 (02)

DOI of Article 10.37434/tpwj2026.10.03

2026 №10 (04)

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The Paton Welding Journal, 2026, #10, 30-38 pages

Effect of resistance butt welding parameters on the formation of dissimilar nickel superalloy joints

I.V. Ziakhor, A.M. Levchuk, A.O. Nakonechnyi, Yu.A. Shylo, M.S. Zavertannyi, H.V. Hushchyn, V.V. Koltsov

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: zyakhor2@ukr.net

Abstract
An urgent problem in the manufacture of welded components of aircraft engines is the development of effective technologies for solid-state joining of nickel superalloys (NS). The work investigated the features of the formation of dissimilar joints during resistance butt welding (RBW) of NS grades VZhL12U and EI698VD, which are used by domestic manufacturers of aircraft gas turbine engines. The microstructure of joints obtained by RBW at different values of technological parameters with one- and two-stage pressure application cycles was studied, in particular, using an intermediate element (IE) in the form of a nichrome alloy (Ni80/Cr20) foil. It was established that with RBW the main problem is to ensure a heat release uniform over the cross-section and localized along the length in the contact zone of workpieces, which is due to the specific temperature dependence of the NS thermophysical characteristics. The increase in the temperature of the metal in the contact zone is accompanied by a decrease in its specific electrical resistance, which is associated with the dissolution of the γʹ-phase during the heating process. The microstructure of the joints of the VZhL12U and EI698VD alloys obtained by RBW is characterized by the presence of a cast core with a dendritic microstructure and defects of the “lack-of-penetration” type in the peripheral part of the cross-section of the welded workpieces. The use of an IE and an increase in the intensity of the deformation effect at the upset stage ensure the localization of contact heating and the displacement of the molten metal beyond the cross-section of the workpieces. The formation of a defect-free joint over the entire cross-section was ensured by the crystallization of a shared cast core under intense plastic deformation during the RBW upsetting stage. Studies of the morphology of the γʹ-phase in the partial melting zone have shown that short-term heating to a temperature exceeding the solvus value does not lead to the dissolution of the γʹ-phase in unmelted grains of the VZhL12U alloy. A comparison of the obtained results with the data on the complete dissolution of the γʹ-phase particles during friction welding of the VZhL12U and EI698VD alloys indicates a significant role of plastic deformation in the formation of the phase composition of NS welded joints.
Keywords: nickel superalloy, pressure butt welding, resistance butt welding, intermediate element, welded joint, microstructure, dendritic microstructure, γʹ-phase, microhardness

Received: 22.06.2026
Received in revised form: 06.08.2026
Accepted: 30.10.2026

References

1. Reed, R.C. (2008) The superalloys: Fundamentals and applications. New York, Cambridge University Press.
2. Das, N. (2010) Advances in nickel-based cast superalloys. Transact. of the Indian Institute of Metals, 63, 265-274. https://doi.org/10.1007/s12666-010-0036-7
3. Henderson, M.B., Arrell, D., Hoebel, M. et al. (2004) Nickel- based superalloy welding practices for industrial gas turbine applications. Sci. and Technology of Welding and Joining, 9(1), 13-21. https://doi.org/10.1179/136217104225017099
4. Caron, J.L., Sowards, J.W. (2014) Weldability of nickel-base alloys. In: Comprehensive Materials Processing. Elsevier, 151-179. https://doi.org/10.1016/B978-0-08-096532-1.00615-4
5. Preuss, M., Threadgill, P. (2010) Solid state welding of aeroengine materials. Encyclopedia of aerospace engineering. Ed. by R. Blockley, W. Shyy. https://doi.org/10.1002/9780470686652.eae222
6. Raab, U., Levin, S., Wagner, L., Heinze C. (2015) Orbital friction welding as an alternative process for blisk manufacturing. J. of Materials Processing Technology, 215, 189-192. https://doi.org/10.1016/j.jmatprotec.2014.06.019
7. Ajay, V., Babu, N.K., Ashfaq, M. et al. (2021) A review on rotary and linear friction welding of inconel alloys. Transact. of the Indian Institute of Metals, 74, 2583-2598. https://doi.org/10.1007/s12666-021-02345-z
8. Wang, F.F., Li, W.Y., Li, J.L., Vairis, A. (2014) Process parameter analysis of inertia friction welding nickel-based superalloy. Int. J. Adv. Manuf. Technol., 71, 1909-1918. https://doi.org/10.1007/s00170-013-5569-6
9. Tra, T.H., Sakaguchi, M. (2016) High cycle fatigue behavior of the IN718/M247 hybrid element fabricated by friction welding at elevated temperatures. J. of Sci.: Advanced Materials and Devices, 1(4), 501-506. https://doi.org/10.1016/j.jsamd.2016.08.009
10. Taysom, B.S., Sorensen, C.D., Nelson, T.W. (2021) Strength in rotary friction welding of five dissimilar nickel-based superalloys. Welding J., 100(9), 302S-308S. https://doi.org/10.29391/2021.100.027
11. Tabaie, S., Rezai-Aria, F., Flipo, B., Jahazi, M. (2021) Grain size and misorientation evolution in linear friction welding of additively manufactured IN718 to forged superalloy AD730. Materials Characterization, 171, 1-13. https://doi.org/10.1016/j.matchar.2020.110766
12. Tabaie, S., Rézaï-Aria, F., Flipo, B.C.D., Jahazi, M. (2022) Dissimilar linear friction welding of selective laser melted Inconel 718 to forged Ni-based superalloy AD730TM: Evolution of strengthening phases. J. of Mater. Sci. & Technology, 96, 248-261. https://doi.org/10.1016/j.jmst.2021.03.086
13. Zhu, X., Xu, P., Liang, Y. et al. (2018) Flash butt weldability of Inconel 718 alloy. J. of Mater. Proces. Technol., 258, 326-333. https://doi.org/10.1016/j.jmatprotec.2018.04.011
14. Zhou, L., Xu, P., Lin, T. et al. (2022) Outstanding ductility of flash-butt welded Inconel 718 joints after post-weld heat treatment. Mater. Sci. and Engineering: A, 843, 143132. https://doi.org/10.1016/j.msea.2022.143132
15. Zhou, L., Lin, T., Xu P. et al. (2024) Grain gradient in the heat-affected zone acquires an advancement in the ductility of flash-butt welded IN718 alloy. J. of Mater. Research and Technol., 33, 4938-4951. https://doi.org/10.1016/j.jmrt.2024.10.100
16. Xiong, J., Yuan, L., Zhu, Yu. et al. (2019) Diffusion bonding of nickel-based superalloy GH4099 with pure nickel interlayer. J. of Mater. Sci., 54, 6552-6564. https://doi.org/10.1007/s10853-018-03274-x
17. Petrushynets, L.V., Falchenko, Iu.V., Ustinov, A.I. et al. (2017) Diffusion welding in a vacuum of a heat-resisting alloy on a Ni-base. Technical Sci. and Technol., 3(9), 63-71 [in Ukrainian]. https://doi.org/10.25140/2411-5363-2017-3(9)-63-71
18. Davies, H., Marchisio, S., Reeks, W. (2020) A review: Interlayer joining of nickel base alloys. J. of Advanced Joining Processes, 2, 100030. https://doi.org/10.1016/j.jajp.2020.100030
19. Kuchuk-Yatsenko, V.S., Shvets, V.I., Sakhatsky, A.G., Nakonechny, A.A. (2009) Features of resistance welding of titanium aluminides using nanolayered aluminium-titanium foils. The Paton Welding J., 3, 11-14.
20. Kuchuk-Yatsenko, S.I., Zyakhor, I.V., Chernobaj, S.V. et al. (2015) Structure of γ-TiAl joints in resistance butt welding with application of interlayers. The Paton Welding J., 9, 5-12. https://doi.org/10.15407/tpwj2015.09.01
21. Kuchuk-Yatsenko, S.I., Zyakhor, I.V., Nakonechny, A.A. et al. (2018) Resistance butt welding of titanium aluminide γ-TiAl with VT5 alloy. The Paton Welding J., 9, 2-6. https://doi.org/10.15407/tpwj2018.09.01
22. Hushchyn, K.V., Zyakhor, I.V., Samotryasov, S.M. et al. (2022) Features of resistance preheating at flash-butt welding of thick-walled parts from aluminium alloys. The Paton Welding J., 10, 18-24. https://doi.org/10.37434/tpwj2022.10.03
23. Paton, B.Ye., Stroganov, G.B., Kishkin, S.T. et al. (1987) Heat resistance of cast nickel alloys and their protection from oxidation. Kyiv, Naukova Dumka [in Russian].
24. Kishkin, S.N., Stroganov, G.B., Logunov, A.V. (1987) Casting high-temperature nickel-based alloys. Moscow, Mashinostroenie [in Russian].
25. Ziakhor, I.V., Zavertannyi, M.S., Levchuk, A.M., Kapitanchuk, L.M. (2020) Pequliarities of formation of joints of dissimilar high-temperature nickel-base alloys in friction welding. Automatic Welding, 8, 38-44 [in Ukrainian]. https://doi.org/10.37434/as2020.08.06
26. Ziakhor, I.V., Levchuk, A.M. (2026) Microstructure and phase composition of joints of cast and wrought nickel superalloys produced by friction welding. Electrometallurgy Today, 1, 53-63 [in Ukrainian]. https://doi.org/10.37434/sem2026.01.07

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Suggested Citation

I.V. Ziakhor, A.M. Levchuk, A.O. Nakonechnyi, Yu.A. Shylo, M.S. Zavertannyi, H.V. Hushchyn, V.V. Koltsov (2026) Effect of resistance butt welding parameters on the formation of dissimilar nickel superalloy joints. The Paton Welding J., 10, 30-38. https://doi.org/10.37434/tpwj2026.10.03

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