Keyword: «impact toughness»

The work is devoted to investigation of polymer material structure and revealing its dependence on conditions and regime of processes occurring at the moment of polymer matrix curing and deformation, as well as the influence of filler and its adhesion to polymer matrix. Initial diagnostics of the structure of glass-reinforced plastic based on epoxy binder ED-20 and glass fabric TR-560-30A (100) was carried out in the experiment to further study the effect of very cold climate of Yakutsk on the strength and deformation characteristics of the composite material.

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.

The article presents the results of a study on multi-pass welded joints made at subzero and ambient air temperatures. Experimental multi-pass welding of low-alloy bridge steel 10HSND (Grade 3) was performed using WN 62U electrodes with registration of the welding thermal cycles. The research results confirm the possibility of producing high-quality welded joints in 10HSND steel under subzero temperature conditions without significant degradation of its performance characteristics.