Shchetynin S. Developing of one-side tube welding process using of electromagnetic field in welding current

Dissertation contains theoretical and experimental investigation results of welding current electromagnetic field distribution regularitis and regulation of the temperatureal field and arc pressure and their elaboration on the base of one-sided tube welding methods. They ensure high-performance weld forming and tube fit going out increase. .. Investigation object: Processes and strengths in force on welded bath liguid metal and determine weld forming at one-sided tube welding on the bed of flux. . Investigation subject: Welding current electromagnetic field distribution regularitis and regulation of temperatureal field and arc pressure. Developed methods of one-sided tube welding. They ensure high-performance welding forming and mechanical characteristics. . Research techniques: Physical and mathematical modeling, natural experiments in industrial tube welding conditions. Calculation-analytical and mathematical statistics metods on personal computer under the speciality developed programs. Metolagraph ic with use РЭМ 200М rentgenostructureal the analysis methods and laser мicrospectroanalysis, mechanical tests of the welded connections characteristics.. . On the basis of physical modeling the prinsipal regularitis of the welding current electromagnetic field distribution in shik of a joint, on which good form influences considerably, are established. Is theoretically proved, that the increase of an induction in a shik of a joint and magnetic blowing at tube welding is a consequence of electromagnetic field power lines concentration in having the large magnetic permeability feromagnetic a tube body, as the tube contour coincides with a direction of field power lines. The mechanism is established and the methods of a welding current electromagnetic field regulation are developed. On the basis of the established regularities of a welding current electromagnetic field regulatiion the one-sided welding method using the mixed electrode is developed. The equation of heat distribution process at welding by the mix ed electrode is received. The calculating-experimental way an optimum construction of an electrode establishes. It is shown what most effectively to improve back weld forming at one-sided welding by dercease directed downwards of electromagnetic pressure and arc pressure. Is established, that at welding the mixed electrode dercease considerably the maximal meanings of arc pressure and directed downwards electromagnetic forces, that provides qualitative weld forming.It is established, that at increase of welding speed back weld forming is improved. On a base of calculating - analytical and experimental investigations the one-sided tube welding method mixed electrode is developed. This allow to ensure gualitative back weld forming at one-sided tube welding on the flux bed, to substitute two-sided on one-sided welding, to lowel materialcapacity and power consumption of process and to increase the mechanical characteristics level .The developed method can be used at the metallurgical enterprises of Ukraine, the d eveloped methods - in educational process during training of the engineering staff.