The Paton Welding Journal, 2024, №01



2024 №01 (02)

DOI of Article 10.37434/tpwj2024.01.03

2024 №01 (04)

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The Paton Welding Journal, 2024, #1, 22-26 pages

Impact of heat treatment on mechanical properties of joints during electron beam welding of 2219 alloy

V.V. Skryabinsky, V.M. Nesterenkov, M.O. Rusynyk

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 plates of 2219 alloy of 40 mm thickness were welded by electron beam welding. The eff ect of sequence of welding operations and heat treatment on the mechanical properties of joints and distribution of hardness in the heat-aff ected-zone (HAZ) were studied. It was established that the plates of 2219 alloy, that were hardened before welding and artifi cially aged after welding, have highest strength. The aging improves the ultimate strength of the joints from 300…315 to 385...395 MPa, and the hardness of the weld and HAZ metal increases by 5…10 HRB units. In the study of joints microstructure, it was found that at a distance of about 1.0 mm from the fusion line in HAZ, a region of high-temperature return to the hardened state is located. It is characterized by an increase in hardness after aging to the level of hardness of the base metal. Measuring thermal welding cycles, it was found that the maximum heating temperature of this region is about 590 °C. Next, an annealing region is located. In this region, a decrease in the hardness of metal by 2...3 units HRB is observed. For welding speed of 20 mm/s, the width of HAZ is about 8 mm and artifi cial aging, carried out after welding, reduces it to 6 mm. Ref. 8, Tabl. 3, Fig. 6.
Keywords: electron beam welding, aluminium alloy, welded joints, heat treatment, mechanical properties, ultimate strength

Received: 12.10.2023
Received in revised form: 15.12.2023
Accepted: 17.01.2024

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