Zarechenskiy D. Optimization of composition and welding-technological characteristics of powdered tape with exothermal mixture for wear-resistant welding

The purpose is development of composition of a powder tape with the exothermal mixture ensuring an optimum relationship of welding-technological properties, qualitative and engineering-and-economical performance of a wear-resistant welding. Subject of inquiry are the processes at welding by self-protective powder tapes that contain exothermal mixtures in filler. Object of research are parameters of a conditions of manufacturing mode and composition of the powder tape core for welding of wear-resistant alloys. Methods of research experimentally-statistic simulation of transition of alloying elements from an electrode in weld metal; a mathematical planning of experiments; statistical treatment of results. Novelty is the new approach to use of thermal effect of exothermal mixtures in powder tapes for a wear-resistant welding that was developed and proved; the experiment-calculated method of temperature evaluation for welding bath at welding by self-protective powder tape was suggested; the increase in powder tape speed in the range of 0,01-0,05 m/s and crimping force 20-40 kN raises contact density of an envelope with a filler due to less packing powder density in a area of an envelope deformation; the optimum granulometric composition of the core of powder tape with exothermal mixture for a welding of an alloy of "Sormayt" type was specified that raises up to 10-30 % transition coefficient of the basic alloying elements from the electrode in weld metal. Economic effect 299, 74 thousand hryvnas per year was obtained. Scope of use is machine construction and metallurgy.