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2025 №03 (02) DOI of Article
10.37434/as2025.03.03 		2025 №03 (04)

Automatic Welding 2025 №03


"Avtomatychne Zvaryuvannya" (Automatic Welding), #3, 2024, pp. 17-22

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

S.L. Zhdanov1, O.A. Haivoronsky1, V.D. Poznyakov1, T. Baudin2, A.V. Zavdoveev1, A.M. Gerasymenko1, R.V. Bogodist1

1E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: patonlab48@ukr.net
2Université Paris-Saclay, CNRS, Institut de chimie moléculaire et des matériaux d’Orsay, 91405, Orsay, France

The paper considers the regularities of phase-structural transformations in welded joints of low-alloy steel S420NL in as-welded, after high-frequency mechanical peening and accumulation of fatigue damage. Welded joints were obtained by mechanized metal arc welding in a carbon dioxide environment with flux-cored wire Filarc PZ 6114 S. The grain, subgrain and dislocation structure of welded joints was studied by light and transmission electron microscopy (TEM). Experimental data were obtained as to the influence of the structure on the change of values of impact toughness (KCV) and brittle fracture resistance (Kq) of untreated welded joints after fatigue damage accumulation. The efficiency of increasing their fatigue resistance due to the use of high-frequency mechanical peening is shown. 13 Ref., 1 Tabl., 5 Fig.
Keywords: low-alloy steel, arc welding, welded joints, structure, high-frequency mechanical peening, fatigue damage, brittle fracture


Received: 29.01.2025
Received in revised form: 04.03.2025
Accepted: 22.04.2025

References

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