Automatic Welding, 2025, №02

2025 №02 (03)

DOI of Article 10.37434/as2025.02.04

2025 №02 (05)

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"Avtomatychne Zvaryuvannya" (Automatic Welding), #2, 2024, pp. 29-37

Technological strength of 25KhN3MFA steel joints in submerged-arc welding

A.K. Tsaryuk, V.Yu. Skulskyi, V.P. Yelagin, I.G. Osipenko

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: tsaryuk@paton.kiev.ua

Weldability of 25KhН3MFA steel was studied and requirements were established for the possibility of its application in fabrication of welded structures in heavy mechanical engineering. Investigations of weldability of 25KhН3MFA steel showed that hot and cold cracks form in welding of this steel. To prevent cold cracking in the welded joints, welding should be performed with preheating and accompanying heating up to 250…300 ºС and mandatory post-weld tempering at 570 ~C. Hot cracks form in welding the root layer of the weld metal, which is related to a significant fraction of the base metal (> 50 %) at mixing with the deposited metal. To be able to manufacture welded structures from this steel, it is necessary to use only automatic narrow-gap submerged-arc welding and to remove the root layer from the welded joint internal side. When it is impossible to remove the root weld, welded structures from 25KhН3MFA steel are not allowed for operation. 17 Ref., 3 Tabl., 8 Fig.
Keywords: complex-alloyed steels, narrow-gap submerged-arc welding, weldability, cold cracks, preheating and accompanying heating, structure


Received: 04.12.2024
Received in revised form: 16.01.2025
Accepted: 07.04.2025

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