The Impact of External Influences on the Characteristics of Metals of Welded Structures of Construction Machines

Abstract

Thermal cycling treatment is the most effective treatment for increasing the reliability and durability of metal structures. In this work, an assessment of the effect of the structure of a metal with a different degree of dispersion, obtained during thermal cycling after a different number of processing cycles, on the mechanical properties of steels 08ps, St3 and 10KhSND was made. Additionally, the influence of the degree of cold plastic deformation on the change in the stray magnetic field strength H_p in low-carbon and low-alloy steels is considered. As a result, methods have been developed for assessing the effect of thermal cycling modes on the mechanical properties of structural steels, as well as the effect of acting stresses during cold plastic deformation of steels 08ps, St3 and 10KhSND on the stray magnetic field strength. Graphical dependencies of values are obtained. On the basis of the research results, the relationship between the structure, magnetic and mechanical parameters was revealed, which allows a reliable assessment of the structural state of the metal and the acting stresses in welded joints and elements of welded metal structures using other methods of passive fluxgate control method. The study is devoted to identifying which zones and places of the welded joint are the most dangerous, and which of them must be controlled first.