The Paton Welding Journal, 2024, №05



2024 №05 (02)

DOI of Article 10.37434/tpwj2024.05.03

2024 №05 (04)

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The Paton Welding Journal, 2024, #5, 18-27 pages
18

Consumable and nonconsumable electrode welding of high-strength 2219-Т31 aluminium alloy

Т.M. Labur, A.G. Poklyatskyi, V.A. Koval

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 influence of the conditions of consumable (TIG) and nonconsumable (MIG) electrode arc welding of high-strength aluminium alloy of 2219-Т31 grade (USA) 5 mm thick was studied. Effective welding modes were selected by the main characteristics: absence of coarse defects, weld form factor, standard mechanical properties, and features of fracture surface relief. The strength level of welded joints after welding is 25-30% lower compared to base metal (σt=366…370 MPa). The impact toughness values of the welds after TIG welding vary from 16.4 to 20.3 J/cm2, according to the rolling direction. Bend angle is almost 3 times lower than the base metal value (180 and 177 degr.). Fracture of joints with technological reinforcement and of the weld root occurs along the boundary of weld fusion with the base metal, at a distance from the surface along the weld axis. The relief retains a predominantly cellular structure. Analysis results were used to establish the technological conditions of achieving an optimal quality of welds and the type of shielding gas for welding.
Keywords: aluminium alloy, nonconsumable and consumable electrode welding modes, inert gases: argon, helium, welded joints, mechanical properties, investigations

Received: 08.02.2024
Received in revised form: 11.03.2024
Accepted: 23.05.2024

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