Lavrentik O. The improvement of technology and equipment for the electrocontact overfusion of the working zone with the regulating distribution of properties

This thesis is dedicated to the improvement of technology and equipment for the electrocontact overfusion of machine parts and instrument with the regulating distribution of the working zone properties and their surfaces that insures the improvement of the unit operating characteristics and the reduced expense of material and energy resources during their strengthening and operation. The object of research is the process of electrocontact overfusion of the working zone with the regulating distribution of properties. The subject of research. The improved arc zone with the base during the electrocontact overfusion process determination conditions and methods of controller influence in heating process, that allows to improve quality characteristics of welded joint. The technologies of the machine parts and instruments improvement made by using the electrocontact overfusion process. Methods of research. Since the use of the experimental methods of research is connected with the great means and time expenditures, the mathematical model was created and its correspondence to the real process was experimentally estimated. Using a computer the numerical heat process modeling was held and it ensures the optimum conditions for choosing the processing parameters of formation of quality welded joint. The electrocontact overfusion process improvement was made using the statistic methods of treatment of the experiment results. The determination of the energy parameters and quality alloying using the electrocontact overfusion; the temperature distribution in welded joint zone and other measurements were held using the proper equipment, i.e. thermopairs, equipment for electrical measurements: ammeters, voltmeters and milivoltmeters; optical and mechanical measuring instruments, metallurgical microscope, etc. There were held the metallurgical researches of micro- and macrostructure specimens for the study of the welded materials and alloying zone properties. The mathematical model of the electrocontact overfusion processwas worked out and it taker into account the welded materials properties, the change of power-supply source parameters and its volt-current characteristics, the control over the law of current distribution on the contact area, the optimum choose of its changing distribution during the processing. All there factors in real time allowed to analyze the heating processes in welding zone and improve the processing itself. The scientifically substantiated method was proposed to control the current distribution process of the electrocontact overfusion, the volt-current characteristics of the power supply source and also to install the insulating gasket capable of destruction during the process between the welding elements. There were worked out the processing to improve the electrocontact overfusion nachine parts and instruments with the regulating distribution of the working zone properties and also the equipment and special welding materials.