Kadava V. Perfection of structure and process of surfacing a powder ribbon of details from low alloed steels, working in conditions of metal about metal friction. .

The dissertation is devoted to a question of improvement of technical characteristics on surfacing process and structure of a powder ribbon for mechanized arc surfacing details from low alloyed steels, working in conditions of metal about metal friction. Subject of research are mechanized arc surfacing of the complex alloy metal by a powder ribbon. Object of research are process of component suppling of ribbon core in a fusion puddle. Research methods include the theoretical calculation and the experimental researches. Mathematical equation was used to find the structure of deposed metal. Experiments are carried out with used of oscillograghy, tension methods, geometrical parameters and mechanical characteristis. In deposed metal chemical elements was found by chemical method. Welding-technological properties of a powder ribbon and properties of deposed metal were investigated in laboratory and industrial condition. The complex theoretical and the experimental researches directed on development of methods of calculation, specification of the initial data, the decision optimization problems and, as a results, improvement of technical characteristics on surfacing process and structure of a powder tape for electro arc surfacing details from low alloyed steels was carried out.The structure of metal is developed (0,20-0,25 % C ; 0,8-1,0 % Mn; 0,25-0,40 % Si; 0,7-0,9 % Cr; 0,22-0,26 % V; 0,20-0,25 % Ti) for restoration of details from low alloyed steels, working in conditions of metal about metal friction, with an optimum combination of wear resistance and adaptability to manufacture.The powder ribbon with the contents gas and slag forming in amount of 6-7 % in core, providing good welding-technological properties. Installation for surfacing with the device for preliminary heating, providing uniform fusion of an environment and the core that improves quality surfacing a layer was modernized. The developed technological process, powder tape and the equipment have passed industrial testsin conditions of company "Kramatorsk's plant of heavy machine-tool construction" and are recommended to use in mechanical engineering for surfacing the details working in conditions of metal about metal friction. Introduction of results of work has allowed to receive annual economic benefit in the sum 63.800 grn. (in the prices of 2001).