The Paton Welding Journal, 2022, №01



2022 №01 (04)

DOI of Article 10.37434/tpwj2022.01.05

2022 №01 (06)

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The Paton Welding Journal, 2022, #1, 22-25 pages

Electron beam welding of aluminium 1570 alloy and mechanical properties of its joints at cryogenic temperatures

V.V. Skryabinskyi¹, V.M. Nesterenkov¹, A.V. Mykytchyk²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
²SE “International Center for Electron Beam Technologies of the E.O. Paton Electric Welding Institute of the NAS of Ukraine” 68 Antonovych Str., 03150, Kyiv, Ukraine

Abstract
The features of electron beam welding of the 1570 alloy were studied and mechanical properties of its welded joints in the temperature range of 20‒293 K were investigated. It was found that during electron beam welding in the 1570 alloy, the width of the heat-affected-zone does not exceed 4 mm from the fusion line, which is 4 times lower than in the AMg6N alloy. In the weld, fusion zone and HAZ cracks, clusters of eutectic interlayers and other defects were not detected. The ultimate strength of the joints of the 1570 alloy at a decrease in the test temperature from 293 to 20 K increases from 325 to 525 MPa. The yield limit is also increased from 210 to 270 MPa, and the ductility changes slightly. At the same time, the impact toughness decreases from 38 to 9 J/cm2. The strength coefficient of welded joints with a decrease in the test temperature from 293 to 20 K increases from 0.85 to 0.95. In general, the 1570 alloy is well welded by electron beam and the method of electron beam welding can be recommended in the manufacture of welded structures of rockets and spacecrafts.
Keywords: electron beam welding, aluminium alloy, mechanical properties, welded joints; cryogenic temperatures

Received: 29.10.2021
Accepted: 07.02.2022

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