Druz O. Regulation of properties of a welded joint by means of a complex shielding medium

Subject of inquiry - thermal and deformation processes, in a parent metal which happen at an arc welding in a complex shielding medium. The purpose of scientific research - regulation of properties of a welded joint through complex shielding medium (KSM) which structure ensures a forced cooling, localization of introduction of heat in a welding item, activation of ability of an arc weld penetration, an improvement in quality of welded joints from a sheet steel. Pilot researches are executed on measuring equipments in conditions of laboratory and production, they contain the following methods: physical, thermoelectric, thermal, an optical microscopic metallography, mechanical. Scientific novelty of the obtained outcomes consists in development of welding practice of designs from thin plates in mixes of shielding gases with a forced cooling. Practical importance of the obtained outcomes. The new design which allows to adjust the sizes of a fissile region of plastic strains, heat-affected zones, geometryof a weld, a level of residual stresses and strains, properties of a welded joint as a whole is developed. The database for the automated simulation of thermic processes in an item is collected at a weldment in KSM. The weldment with use KSM is recommended at manufacturing elements a diesel engine of trains, containers, girders of coke-screening arrangements and is introduced at a weldment of manacle rings of heat exchangers ("Snegnjanskhimmash"). Outcomes of dissertational research are introduced into educational process in Vladimir Dal East Ukrainian national university. Use KSM has reduced welding strains on the average by 50 %.