Avtomaticheskaya Svarka (Automatic Welding), #5, 2021, pp. 40-45
Effect of thermal cycles in electron beam welding of aluminum 1570 alloy on mechanical properties of welded joints
V.M. Nesterenkov, V.V. Skryabinsky, М.О. Rusynyk
E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
The effect of welding speed on the strength of joints and the size of the heat-affected-zone in electron beam welding of 1570 alloy
was investigated. Thermal cycles in the tail part of the welding pool and spots in the metal surface in the near-weld zone were
determined. According to the thermal cycles of the welding pool, the rate of hardening of the weld metal was calculated and its
effect on the mechanical properties of the joints before and after artificial aging was investigated. Decrease in the welding speed
and, consequently, increase in the lifetime of the liquid phase leads to the growth of hardness of the weld metal after aging, which
is probably associated with a more complete dissolution of primary scandium intermetallics and its transition to a supersaturated
solid solution during cooling. Measuring the hardness of metal in the cross-section of the joints, according to the thermal cycles
of the corresponding spots, it was determined that the temperature of the beginning of the loss of strength of the metal in electron
beam welding of 1570 alloy is in the range of 450…560 °С. It was found that artificial aging makes welded joints full strength with
stamped semi-finished products, and explosion treatment is ineffective. It is possible to increase the strength of joints to the level
of strength of hardened plates by plastic deformation by 20% and a subsequent artificial aging. 7 Ref., 3 Tabl., 8 Fig.
electron beam welding, aluminum alloy, welded joints, thermal cycles, mechanical properties, artificial aging
1. Filatov, Yu.A. (2014) Alloys of Al–Mg–Sc system as a
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5. Fedorchuk, V.E., Kushnaryova, O.S., Alekseenko, T.A., Falchenko, Yu.V. (2014) Peculiarities of alloying of weld metal of high-strength aluminium alloy welded joints with scandium. The Paton Welding J., 5, 28-32. https://doi.org/10.15407/tpwj2014.05.05
6. Skryabinskyi, V.V., Nesterenkov, V.M., Rusynyk, M.O., Strashko, V.R. (2020) Effect of mode of electron beam welding, heat treatment and plastic deformation on strength of joints of aluminium 1570 alloy. Ibid., 5, 9-14. https://doi.org/10.37434/tpwj2020.05.02
7. Tretyak, N.G., Saenko, M.I., Petushkov, V.G. (1980)
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