Keyword: «surfacing»

The paper substantiates the direction associated with the solution of the interdisciplinary problem of finding ways to improve the reliability and survivability of resource-determining parts and products of equipment operating in the conditions of natural low climatic temperatures of the Northern and Arctic re-gions of the Russian Federation. Prompt provision of services for the repair of worn-out equipment reduces the costs of downtime of production facilities operating in conditions of low climatic temperatures: marine and river marine equipment, port infrastructure, mining, construction and installation, automotive and road construction equipment, pipeline and railway transport. The paper substantiates the need for scientifically based support of the tasks to be solved, not only for the conditions of stationary repair and restoration and welding and assembly complexes of wear-out parts and products of equipment of northern execution, but also for the conditions of their use in mobile complexes.

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.

This paper examines the structure and properties of worn mid-motor blades on heavy-duty motor graders operating in Yakutia. The wear characteristics of mid-motor blades at low temperatures are revealed, and operational data are analyzed. The chemical composition, structure, and properties of motor grader blades from two different manufacturers were analyzed. The results showed that the working parts of heavy road construction equipment are characterized by the presence of a finely dispersed, needle-like structural component, which undergoes appropriate heat treatment.

The material presented in this article is part of research aimed at finding ways to improve the efficiency of assembly and repair technologies for critical structures operating in the low climatic temperatures of the North. The developed direction is presented as a discussion of research results obtained through the comprehensive application of advanced methods for controlling their strength and operational characteristics. An important component of the proposed article is the fundamentally new results obtained by leveraging the capabilities of adaptive pulse control methods for heat and mass transfer characteristics. This is achieved through full control over the system «power source – arc – weld pool – workpiece» under various disturbing influences. The article also presents research results on a new generation of domestically produced welding and surfacing electrodes. The concept presented in the article does not cover all the numerous examples aimed at ensuring the operational reliability of northern structures, but it illustrates one of the few effective options for a comprehensive approach to achieving the set goals.

The study is devoted to solving the problems of abrasive wear of mining equipment parts operating in harsh Arctic conditions. The effectiveness of surfacing with direct current and modulated current was compared. It was found that the use of pulsed-arc technology reduces the burn-off of alloying elements in the melt. This ensures better transfer of the electrode's chemical composition to the surfacing layer and targeted adjustment of its properties. The results showed that the influence of the technology on the coating hardness varies depending on the composition of the surfacing material, confirming its potential for managing the quality of restoration of critical components.