| 2025 №04 (05) |
DOI of Article 10.37434/tpwj2025.04.06 |
2025 №04 (07) |
The Paton Welding Journal, 2025, #4, 37-45 pages
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 NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: tsaryuk@paton.kiev.uaAbstract
Weldability of 25KhN3MFA steel was studied and requirements for the possibility of its application in manufacture of welded structures in heavy mechanical engineering were established. Investigations of weldability of 25KhN3MFA steel showed that hot and cold cracks form during welding of this steel. To prevent cold cracking in the welded joints, welding should be performed with preheating and interpass heating up to 250‒300 °C 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 enable manufacturing 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 inner side of a welded joint. When it is impossible to remove the root weld, welded structures from 25KhN3MFA steel are not allowed for operation.
Keywords: complex-alloyed steels, narrow-gap submerged arc welding, weldability, cold cracks, hot cracks, preheating and interpass heating, structure
Received: 04.12.2024
Received in revised form: 16.01.2025
Accepted: 08.05.2025
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