Automatic Welding, 2025, №05

2025 №05 (05)

DOI of Article 10.37434/as2025.05.06

2025 №05 (07)

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"Avtomatychne Zvaryuvannya" (Automatic Welding), #5, 2024, pp. 56-59

Mechanical properties of metal in areas of welded joints of mediumcarbon alloy steels heated to temperatures from 350 to 800 °C

V.D. Poznyakov, O.V. Korieniev

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: korenew@ukr.net

During welding, two characteristic areas are formed in the heat-affected zone (HAZ) of welded joints of medium-carbon alloy steels with hardened (located in the HAZ areas of overheating, normalization and partial recrystallization – high-temperature area) and tempered (located mainly in the HAZ areas of recrystallization and blue brittleness – low-temperature area) metal. In welded joints made using manual arc and mechanized gas-shielded welding with small-diameter wires, the width of these areas can reach 2.5 and 8 mm, respectively. The technical literature is well-illustrated with regard to the influence of thermal cycles, characteristic for the high-temperature area of the HAZ, on the mechanical properties of the metal. There is much less information on the influence of thermal cycles of welding on the mechanical properties of the low-temperature area of the HAZ. This paper presents the data on the course of the heating and cooling process of the HAZ metal of butt welded joints 12 mm thick, which were heated to temperatures of 780, 550 and 350 °C, and on the effect of such heating on the mechanical properties (hardness, strength, ductility, impact toughness) of medium-carbon alloy steels with different content of alloying elements. 13 Ref., 2 Tabl., 2 Fig.
Keywords: medium-carbon alloy steels, mechanical properties, thermal cycles, alloying elements


Received: 02.06.2025
Received in revised form: 01.10.2025
Accepted: 13.10.2025

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