Scientific school "Physicochemical and thermo-deformation bases of welding and related processes"

Field of knowledge and speciality:

•  Scientific direction and field of knowledge (according to the list in Table 1);
  Research area - Technical sciences;Field of knowledge - 13 mechanical engineering
• scientific speciality - 131Applied mechanics;
  educational speciality - 131 Applied Mechanics;
• educational and research programmes for bachelors, masters and PhD:
  Bachelor's and Master's degree programmes - Engineering in welding with laser and related technologies
  PhD - 131 Applied Mechanics.

   The school was founded in 1935 by the founder of the Department of Welding Production at the Kyiv Polytechnic Institute, Academician, Doctor of Technical Sciences, Professor Yevhen Oskarovych Paton.

     1935-1938 - the school was headed by the founder of the academy, Doctor of Technical Sciences, Professor Paton Yevhen Oskarovych. During these years, the physical, physicochemical and engineering foundations of automatic electric arc welding were laid, the formation and influence of shrinkage stresses on the strength of welded structures were studied.

     1947-1957 - Academician, Doctor of Technical Sciences, Professor Konstantin K. Khrenov was the head of the school. This period is characterised by active research into the physical and chemical processes in the welding arc as a basis for the development of ceramic fluxes and technologies for underwater welding and metal cutting. The channel model of the welding arc, the compressed arc, and the principles of compressed arc formation are studied.

     1957-1967 - the school is headed by Professor Ivan Trochun. The scientific basis for stress control in submerged arc welding is developed, and significant work is done to create specialised mechanical strain gauges for stress studies far beyond the borders of the Soviet Union. Research is underway on 4750 - brittleness in welding of stainless steels, the effect of gases on the properties of welds, welding in nitrogen, bare wire welding. Research is carried out to prevent loss of stability when welding thin-walled sheet structures.

     1967-1969 - the school is headed by Doctor of Technical Sciences, Professor Vladimir Ivanovich Dyatlov. During this period, interfacial interactions at gas-metal, slag-metal, slag-gas interfaces and the role of the gas phase in weld metal formation during arc welding were studied. The physical and chemical processes that occur during heating, melting and solidification of welding fluxes were studied using thermography. The theoretical foundations of the magnetic-elastic method for determining residual stresses in welded structures and a line of control and measuring instruments were developed.

     1969-1972 - Corresponding Member, Doctor of Technical Sciences, Professor Boris S. Kasatkin. Studies the adsorption embrittlement of welded joints of dissimilar metals. This period is marked by the study of deformations and stresses in welding of structures made of non-ferrous metals and high-strength low-alloy steels.

     1974-1989 - Doctor of Technical Sciences, Professor Patskevich Ivan Romanovich is the head of the school. He studies the influence of surface phenomena on the formation of weld metal defects, the ability to wet and spread dissimilar liquid metal pairs under isothermal and non-isothermal conditions, determines the influence of external disturbances on these phenomena and investigates the weldability of cast irons. The features of electrode metal transfer, weld pool formation, and the influence of heat input parameters in welding aluminium alloys are investigated. The possibilities of using fluoride-free molten fluxes for welding general-purpose steels with activated electrode wire are studied. The mechanisms of formation of angular deformations during multi-pass welding and recommendations for their reduction are determined. The mechanisms of formation were studied and special equipment was developed to reduce deformations during welding of thin-walled stainless steel pipelines in the manufacture of aircraft equipment.

    1989-2015 - the school was headed by Doctor of Technical Sciences, Professor V.M. Prokhorenko. During these years, the kinetics of alloying the weld pool through flux was studied, fused fluxes and surfacing technology in the flux stream were developed. The physicochemical processes of gas phase formation in submerged arc welding and the theoretical basis for the formation of weld metal composition were studied. Research and development work was carried out to create new composite materials for brazing in instrumentation, improve the manufacturability of special space-based welded structures, and relevant technological recommendations were developed. For the needs of the oil and gas industry, chemical and power engineering enterprises of Ukraine, the theoretical foundations of a multi-parameter method for assessing the stress-strain state of metal and studying the mechanisms of fracture and diagnostic methods for main gas and oil pipelines were developed, and a prototype device for electromagnetic monitoring of the stress-strain state of welded pipelines was developed. The company studied the ability to separate slag crusts, the stability of welding arc burning and electrical parameters of the AC arc, the resistance of welds to cracking, and the problems of thermal straightening of welded beams. An innovative technology was developed and industrial equipment for cutting low-carbon and low-alloy steels and alloys with the addition of water to the plasma was created. The results were implemented at the Kherson Shipyard. The scientific principles of stress-strain state control during solid-state welding were determined. The influence of high-energy pulsed energy sources on the formation of modified layers of materials was investigated. The use of low-energy high-current electron beams and compression plasma to intensify the processes of volumetric interaction in diffusion welding and brazing with pressure in a vacuum is recommended. Technologies for diffusion welding with thermal cycling and contact-reactive brazing of metal-ceramic products were developed. Based on the development results, batches of industrial parts were manufactured for the Kharkiv Aggregate Design Bureau and Technobim LLC (E.O. Paton Institute of Engineering and Technology of the National Academy of Sciences of Ukraine). Separate modules are being developed for computer-aided design systems for welded structures, manufacturing technology and tooling, automated control systems for the welding process, robots, automated workstations for designers and technologists, software for inverter power supplies, automated training systems and expert systems for welding. The research results are used by universities in Ukraine and Germany (Technical University, Rostock). The scientific and methodological developments of the school's scientists became the basis for the establishment of the Welding Training Centre in 1988. Welding Training Centre in Cuba at the University of Las Villas and a joint Ukrainian-German faculty with the Institute of Welding and Radiation Technology of the Otto von Guericke University of Magdeburg in 1988.

     Since 2015, the school has been headed by Doctor of Technical Sciences, Professor V. Kvasnytskyi. Intensive cooperation has been established with the Central Research Institute of the Armed Forces of Ukraine (AFU), which has developed technologies for the manufacture of protective anti-multiplier screens for the protection of military armoured vehicles. The shields have been delivered and installed at the Armed Forces of Ukraine. Research is being conducted to ensure high quality welded joints of armour steels of domestic and foreign production. A comparative analysis of the physical and mechanical properties of basic and promising materials for the manufacture of protective anti-multiplier screens (PMS) was carried out. The peculiarities of structural and phase transformations of these materials depending on the temperature cycle of welding and their influence on the mechanical properties of the metal of welded joints are determined.

     Calculation methods for thermal fields and stress-strain state during welding, thermodynamic calculations and mathematical computer modelling of redox and other metallurgical reactions between liquid and gas phases in the submerged arc welding reaction zone are being developed. The influence of welding thermal, thermomechanical, processes on the structure, technological strength, quality of metal and composite materials in welding and additive technologies is studied. Process-oriented models of welding coordination and risk-oriented plans for selective control are being developed. Cooperation with Chinese scientists is developing.

Outstanding graduates of the school:

He is the successor of the founder. Academician, Laureate of State Prizes Konstiantyn Kostiantynovych Khrenov.

Graduated from the school in 1950. Academician, Laureate of State Prizes Pohodnia Igor Kostiantynovych.

Graduated from the school in 1958. Academician, Deputy Director of the E.O. Paton Institute of Electric Welding, Laureate of State Prizes Yushchenko Kostiantyn Andriiovych (http://irbis-nbuv.gov.ua >>>>>)