|2020 №05 (01)||DOI of Article
|2020 №05 (03)|
TPWJ, 2020, #5, 9-14 pages
Effect of mode of electron beam welding, heat treatment and plastic deformation on strength of joints of aluminium 1570 alloy
V.V. Skryabinskyi, V.M. Nesterenkov, M.O. Rusynyk and V.R. Strashko
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 effect of the rate of hardening the weld metal during EBW process and the temperature of the subsequent heat treatment on the strength of welded joints of aluminium 1570 alloy was studied. The rate of «hardening» the weld metal was measured by submerging thermocouple into the molten metal of weld pool. At an increase in welding speed from 2.8 to 16.8 mm/s, the rate of «hardening» grows from 5∙102 to 1∙104 °C/s and the subsequent heat treatment of welded joints increases their strength to the level of strength of the base metal of stamped semi-finished products of 1570 alloy. It was established that during electron beam welding, the welding speed and, consequently, the rate of «hardening» do not affect the strength level of heat-treated joints. The optimal mode of heat treatment is artificial aging at a temperature of 350 °C and 1 h duration. It is possible to increase the strength of welded joints of 1570 alloy to the level of strength of rolled plates by 30 % applying a cold plastic deformation or by 20 % applying deformation with a subsequent artificial aging. 10 Ref., 3 Tables, 9 Figures.
Keywords: electron beam welding, aluminium alloy, welded joints, welding speed, heat treatment, strength
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