Avtomaticheskaya Svarka (Automatic Welding), #2, 2021, pp. 22-31
Influence of heat treatment on the properties of welded joints of V1341 alloy under modeled operating conditions
L.I. Nyrkova, Т.M. Labur, S.O. Osadchuk, М.R. Yavorska, V.A. Koval
E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: firstname.lastname@example.org
The paper presents the results of comparative studies of corrosion-mechanical resistance of welded joints of V1341 alloy 1.2
mm thick, produced by manual argon-arc welding with free and constricted arc, after different types of heat treatment (HT)
– artificial aging and full cycle heat treatment (hardening and artificial aging). It was shown that artificial aging increases the
strength characteristics of welded joints: those produced by free arc - by ~23%, compared to the base metal, by constricted
arc – by ~29%, but reduces the relative elongation by ~82% and ~84%, and the strength coefficient – to 0.77 and 0.71 (0.81
and 0.83 in as-welded state), respectively. The full cycle of HT provides increase in both strength and ductility. After artificial
aging, as well as after a complete heat treatment cycle, the potential difference between the base metal and the HAZ does not
exceed the permissible value of 0.05 V (according to GOST 9.005), which will not be dangerous at operation in non-aggressive
environments. Artificial aging and full HT cycle do not impair the resistance of welded joints of VB1341T alloy to exfoliating
corrosion compared to as-welded state, which is assessed as value 2. An increase of resistance to intercrystalline corrosion (ICC)
after artificial aging was demonstrated, the maximum depth of which was 0.301 mm for the joint produced by a free arc, and
0.233 mm – for a joint produced by a constricted arc (in as-welded state it was 0.350 mm and 0.47 mm, respectively). After a
complete HT cycle, the ICC depth was 0.287 mm and 0.345 mm, respectively. Artificial aging reduces the corrosion-mechanical
resistance of welded joints produced by free and constricted arc: the time to fracture of the samples was 9 and 12 days, respectively
(compared to 45 days in as-welded state), but after a full cycle of HT maximum time to fracture of welded joints increased
to 54 and 31 days, respectively. Welded joints produced by a constricted arc had higher corrosion-mechanical resistance after a
complete heat treatment cycle. 14 Ref., 5 Tabl., 7 Fig.
aluminum alloy, welded joints produced by free and constricted arc welding, mechanical properties, structure,
intercrystalline corrosion, exfoliating corrosion, corrosion under constant strain, potentiometry, voltamperometry
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