The Paton Welding Journal, 2021, №10



2021 №10 (02)

DOI of Article 10.37434/tpwj2021.10.03

2021 №10 (04)

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The Paton Welding Journal, 2021, #10, 18-27 pages

Corrosion-mechanical resistance of 2219 alloy welded joints under simulated service conditions

L.I. Nyrkova¹, T.M. Labur¹, E.I. Shevtsov², O.P. Nazarenko² and A.V. Dorofeev²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
²SC «DB Pivdenne» 3 Kryvorizzka Str., 49008, Dnipro, Ukraine

In the work participated: S.O. Osadchuk, M.R. Yavorska, A.G. Poklyatskyi, V.E. Fedorchuk.

Abstract
We studied the corrosion resistance, including local corrosion resistance, of welded joints of aluminium 2219 alloy, made by nonconsumable electrode single-pass welding along (L) and across (T) the rolled metal heat-treated to the Т81 condition. It is shown that resistance of welded joints of 2219 alloy to general and local corrosion in amyl and its vapors does not depend on the direction of workpieces during welding. An increase in ductility and strength values of welded joint specimens was found after soaking them in amyl and amyl vapors. The coefficient of welded joints strength after soaking in amyl rises from 0.65 up to 0.67 in the longitudinal direction, and from 0.64 to 0.66 in the transverse direction. After soaking in amyl vapors, the strength properties of the welded joint almost do not change: strength coefficient was the same in both orientation directions and it was equal to 0.64. Fracture ran along the fusion line of the weld with the base metal, where melting of grain boundaries and their thickening take place during the thermal cycle of welding at crystallization, as well as decomposition of copper over saturated solid solution in aluminium, which is accompanied by precipitation and coagulation of the strengthening phases.
Keywords: 2219 aluminium alloy, welded joints, heat treatment, corrosion resistance, mechanical properties, microstructure, mechanical fracture at tension

Received: 27.08.2021
Accepted: 11.11.2021

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