Keyword: «weldability»

This paper reveals the features of the operation of river vessels in the territory of Yakutia, as well as the technologies used in the repair and restoration of propeller shafts. With the seasonal nature of navigation, it is possible to prevent sudden failures of these units during the operation of ships by preventive repairs. The propeller shaft fails for three main reasons – corrosion, wear and fatigue damage. These defects are eliminated by mechanical grinding and resurface welding or welding.

This paper reveals the features of the operation of river vessels in Yakutia, as well as the technologies used in the repair and restoration of propeller shafts. With the seasonal nature of navigation, it is possible to prevent sudden failures of these nodes during the operation of ships by preventive repairs. The propeller shaft fails for three main reasons – corrosion, wear and fatigue damage. These defects are eliminated by mechanical grinding and subsequent surfacing or welding. Тhe paper shows that the use of scientifically based approaches in the restoration of propeller shafts is a necessary condition for obtaining a high-quality deposited layer.

The paper studies welded joints of high-strength pipe steels in twin-arc automatic welding in a shielding gas. The microstructure, transverse and longitudinal macro- and microhardness distribution in various zones of welded joints are studied. Mechanical tests for static tension and impact toughness at low temperatures are carried out. The causes of heterogeneity and the degree of softening in the heat-affected zone are established. The principles of reducing microstructural and mechanical heterogeneity are formulated.