The Paton Welding Journal, 2025, №06

2025 №06 (07)

DOI of Article 10.37434/tpwj2025.06.01

2025 №06 (02)

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The Paton Welding Journal, 2025, #6, 3-8 pages

Impact of arc welding and high-frequency mechanical forging on the mechanical properties and resistance to brittle fracture of welded joints of S420NL steel

S.L. Zhdanov, O.A. Haivoronsky, V.D. Poznyakov, A.V. Zavdoveev, A.M. Gerasymenko, R.V. Bogodist

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: patonlab48@ukr.net

Abstract
The paper considers the regularities of phase-structural transformations in welded joints of low-alloy S420NL steel in the initial state, after high-frequency mechanical forging and accumulation of fatigue damage. Welded joints were produced by mechanized gas metal arc welding in a carbon dioxide environment using Filarc PZ 6114 S flux-cored wire. The grain, subgrain and dislocation structures of welded joints were studied by light and transmission electron microscopy (TEM). The experimental data on the impact of the structure on the change in the values of the impact toughness (KCV) and brittle fracture resistance (Kq) of welded joints without treatment with high-frequency mechanical forging, after accumulation of fatigue damage were obtained. The efficiency of increasing their fatigue resistance due to the use of high-frequency mechanical forging is shown.
Keywords: low-alloy steel, arc welding, welded joints, structure, high-frequency mechanical forging, fatigue damage, brittle fracture

Received: 29.01.2025
Received in revised form: 22.04.2025
Accepted: 25.06.2025

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Suggested Citation

S.L. Zhdanov, O.A. Haivoronsky, V.D. Poznyakov, A.V. Zavdoveev, A.M. Gerasymenko, R.V. Bogodist (2025) Impact of arc welding and high-frequency mechanical forging on the mechanical properties and resistance to brittle fracture of welded joints of S420NL stee. The Paton Welding J., 06, 3-8.

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