The Paton Welding Journal, 2023, №10



2023 №10 (01)

DOI of Article 10.37434/tpwj2023.10.02

2023 №10 (03)

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The Paton Welding Journal, 2023, #10, 10-17 pages

Features of welding duplex stainless steels in wet underwater welding in comparison with welding in air (Review)

S.Yu. Maksymov, G.V. Fadejeva, A.A. Radzijevska, D.V. Vasyljev

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 presented review shows that the main task in welding duplex stainless steels (DSS) is ensuring the conditions which should promote reduction of the negative impact of the welding thermal cycle on the microstructure and change of the initial balance of the phase components, particularly in the high-temperature region of the HAZ. In welding duplex stainless steels the required ratio of ferrite and austenite in the weld metal is provided by changing the chemical composition, and in the HAZ it is achieved due to lowering of the cooling rate. Depending on cooling rate W13/8 or time of soaking predominantly in the temperature range of phase transformations, the respective microstructure of metal the weld and HAZ is formed with the specified ratio of phase components of austenite and ferrite, which, in its turn, affects the mechanical properties and corrosion resistance of duplex steel welded joints. A clear correlation of the mechanical properties is observed, depending on austenite and ferrite content in the weld metal. With increase of the cooling rate, the quantity of precipitates of excess phase, Cr2N chromium nitrides, becomes greater. It was found that in view of intensive cooling impact of the water environment, the volume fraction of austenitic phase is lower in the metal of the weld and in the HAZ high-temperature region in wet underwater welding, compared with volume fraction of the austenitic component in welding in air at the same heat input values. With increase of the energy input, a significant increase of volume fraction of austenitic phase is observed, particularly in wet underwater welding. Considering the features, characteristic for wet underwater welding, the energy input levels and chemical composition of weld metal require correction as regards the recommendations, which were developed for welding in air. 38 Ref., 3 Tabl., 4 Fig.
Keywords: duplex steels, wet underwater welding, energy input, cooling rate, phase composition, austenite, ferrite, microstructure, welding thermal cycle.

Received: 12.07.2023
Accepted: 14.11.2023

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