Automatic Welding, 2021, №10



2021 №10 (02)

DOI of Article 10.37434/as2021.10.03

2021 №10 (04)

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Avtomaticheskaya Svarka (Automatic Welding), #10, 2021, pp. 19-28

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

L.I. Nyrkova¹, T.M. Labur¹, Ye.I. Shevtsov², O.P. Nazarenko², 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 Kryvorizhska Str., 49008, Dnipro

ДWe studied the corrosion resistance, including local corrosion resistance, of welded joints of aluminium alloy 2219, made by nonconsumable electrode single-pass welding along (L) and across (Acr) the rolling stock heat-treated to Т81 condition. It is shown that resistance of welded joints of 2219 alloy to general and local corrosion in amyl and its vapours does not depend on the direction of billet rolling in welding. An increase of ductility and strength of welded joint samples was found after soaking them in amyl and amyl vapours. The coefficient of welded joint 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 vapours, the strength properties of the welded joint almost do not change: strength coefficient was the same in both the orientation directions and it was equal to 0.64. Fracture ran along the line of fusion of the weld with the base metal, where melting of grain boundaries and their thickening take place during the thermal cycle of welding at solidification, as well as decomposition of copper solid solution in aluminium, which is accompanied by precipitation and coagulation of the strengthening phases. 23 Ref., 2 Tabl., 6 Fig.
Keywords: 2219 aluminium alloy, welded joints, heat treatment, corrosion resistance, mechanical properties, microstructure, mechanical fracture at tension


Received: 27.08.2021

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