The Paton Welding Journal, 2024, №12



2024 №12 (03)

DOI of Article 10.37434/tpwj2024.12.04

2024 №12 (05)

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The Paton Welding Journal, 2024, #12, 23-29 pages

Residual stresses induced by friction stir welding of heat strengthened aluminium 2219-T81 alloy plates

O.V. Makhnenko, O.S. Milenin, V.I. Pavlovsky, V.V. Savitsky, B.R. Tsaryk

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: makhnenko@paton.kiev.ua

Abstract
Friction stir welding (FSW) is a relatively new welding process that has already been widely used for joining structures in the aerospace industry, transport and shipbuilding. It is believed that, in comparison with traditional arc welding processes, FSW provides less heating of the joint metal and a reduction in the level of residual stresses and strains. In the work, the features of the distribution of residual stresses induced by FSW in the butt joint of the heat strengthened aluminium alloy are investigated, which is necessary for predicting the strength and service life of welded structures. A mathematical model was built to determine the residual stresses at FSW, and the effect of softening of the aluminium alloy during heating in welding on the residual stresses was considered. The comparison of calculated and experimental data on the distribution of residual longitudinal stresses in FSW specimens showed a satisfactory level of their correspondence. It is shown that the determined level of residual tensile stresses is close to the yield strength of the annealed metal.
Keywords: aluminium alloy, friction stir welding, butt joint, residual stresses, mathematical modelling, experimental measurement

Received: 15.08.2024
Received in revised form: 30.09.2024
Accepted: 27.12.2024

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Suggested Citation

O.V. Makhnenko, O.S. Milenin, V.I. Pavlovsky, V.V. Savitsky, B.R. Tsaryk (2024) Residual stresses induced by friction stir welding of heat strengthened aluminium 2219-T81 alloy plates. The Paton Welding J., 12, 23-29.

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