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2021 №09 (01) DOI of Article
10.37434/tpwj2021.09.02 		2021 №09 (03)

The Paton Welding Journal 2021 №09


The Paton Welding Journal, 2021, #9, 9-14 pages

Problems of wet underwater welding of duplex steels

S.Yu. Maksymov, A.A. Radzievska, D.V. Vasyliev and G.V. Fadeeva


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

Abstract
The article considers the problem of welding duplex steels: state-of-the-art of the problem and prospects for further development. Welds made in air and under water using coated electrodes, are characterized by a similar structure and properties. Intensive cooling provided by the water environment does not increase the content of ferrite in the weld and HAZ as compared to its content in the joints made in the air. Butt joints produced under water at an unstable arc burning are characterized by a tendency to cold crack formation in the weld metal, but in the HAZ cracks were not detected. In the article the analysis of hardness distribution in the studied joints was presented, which did not reveal significant differences between the values determined in the welds made in air and in water. The size of austenitic phases in dry welding was larger than in wet welding under the same conditions of heat input. In wet welding, the share of γ-phase increased significantly at increase in input energy from 27.31 to 39.46 % for the weld center and from 35.01 to 44.9 % for the weld metal adjacent to the fusion line. All the studied variants of chemical composition of the weld metal were insensitive to local corrosion due to high values of PREN. The weld metal adjacent to the fusion line showed optimal resistance to local corrosion, and the weld metal also showed better resistance to local corrosion than did the heat-affected-zone. 17 Ref., 1 Table, 8 Figures.
Keywords: duplex steels, underwater welding, welded joint, formation, structure, corrosion, service properties, welding consumables

Received 07.07.2021

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