Loza A. Development of a method for increasing operational resilience bowls of blast slag transfercars with the use of welding

The object of research - process welding of carbon steels with different structures in weld-fabricated construction. Subject of research - regularities of formation of structure and properties of the main cast of metal and weld in a molten-welded structures operating under cyclic thermal effects. Research methods - techniques of frame designing three-dimensional models, mathematical modeling of the behavior of structures under various types of loading, the study of micro - and macrostructure, hardness testing and mechanical properties determination of the chemical composition of the investigated metal, the mathematical processing of the research results based on statistical methods using modern software. The thesis solved the actual scientific and technical problem of increasing the opera-tional stability of the domain bowls of slag due to the additional strengthening elements, is fixed by welding at the areas of greatest pressures, which provides a redistribution of efforts on the inside of the bowl, reduce its deformation and prolongs service life. New data have been obtained regarding the features of the formation of the microstructure of cast steel 30L, 35L with welding the stiffeners in the heat-affected zone weld-fabricated joints. It is shown that the deformation of the casing cast construction of the bowl can be reduced by 3-4 times by the use of additional reinforcing elements which are mounted by welding. Found that the use of the interlayer during welding of reinforcing elements and the body of the bowl in the zone of greatest deformation it ensures that no fragile layers in the weld-fabricated increases its strength to at least Sв=465 MPa. Mathematical models of influence of stress distribution mostly cast metal for strength welds in a molten-welded construction of the bowl of slag cars that works at T=400-600°C.