Contents of the Paton Welding
Journal no.1, 2010 |
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SCIENTIFIC AND TECHNICAL |
Krivtsun I.V., Semyonov I.L. and Demchenko V.F. Numerical analysis of the processes of heating and convective evaporation of metal in pulse laser treatment |
2 |
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Mathematical model of the processes of heating, melting and evaporation of metal under the effect of a focused laser beam is suggested. The model allows describing thermal processes in the bulk of metal and gas-dynamic processes in a metal vapour flow occurring in laser treatment by using pulse lasers. Numerical analysis was conducted to study the processes of heating and convective evaporation of metal with a millisecond pulse of the Nd:YAG-laser beam affecting a low-carbon steel sample. |
Makhnenko V.I., But V.S., Kozlitina S.S. and Olejnik O.I. Risk of fracture of pressurised main pipeline with defects of the type of wall thinning during repair |
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It is shown that welding repair of defects of the type of pipeline wall thinning by compensating the metal lost in the thinning zone by the deposited metal using low-current (~90 A) manual arc weld deposition is a sufficiently efficient technology. Wide application of this technology for repair of pressurised main pipelines is limited by the safety problem. Also, it is shown that the minimum admissible wall thickness in the defect zone under operating pressures depends upon the size of a defect along the generating line and, to a much lesser degree, upon its size on the circumference, as well as upon the thermal parameters of welding and accepted sequence of welding-up (deposition) of the defect. |
Ustinov A.I., Zinkovsky A.P., Tokar I.G. and Skorodzievsky V.S. Possibilities for lowering dynamic stress in structural elements of machines using nanostructured coatings |
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The paper gives the results of experimental studies of the influence of structural characteristics on physico-mechanical properties of coating materials and damping capacity of coated structural elements allowing for such factors as temperature, frequency and amplitude of stress. |
Chernykh I.V. and Rachkov S.A. Modelling of the process of induction heating of pipes within the weld zone |
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Modelling procedure for the process of induction heating of large-diameter pipes before welding is considered. The choice of a software package for modelling is substantiated, and an example of modelling is given. The pattern of temperature field in the weld zone and plots of temperature distribution in the pipe wall are described. An example of embodiment of the induction heating unit is given. |
Vasiliev Yu.S., Parshutina L.S. and Chukashkin A.N. Development of the technology for formation of mechanical and glued-mechanical joints by the punching method |
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The processes of formation of mechanical joints in thin-sheet materials with anticorrosive coatings by the punching method using glue compositions of different viscosities between the mating surfaces were investigated. The limiting values of rheological characteristics of the glues that affect formation of the glued-mechanical joints were established. The cold-cured highly filled glue composition on a silicon-polyurethane base, not preventing formation of the glued-mechanical joints, was developed. Press equipment based on a pneumatic actuator, providing a compression force of up to 20 kN, was developed and manufactured. |
Levchenko O.G., Lukianenko A.O. and Polukarov Yu.O. Experimental and calculation determination of the concentration of harmful materials in the work zone air in covered-electrode welding |
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Investigation results are presented on dependence of the concentration of harmful materials in the work zone air in manual rutile-cellulose electrode welding upon the distance to the welding arc under different ventilation conditions (general, local and without ventilation), as well as analytical dependencies of the concentration of harmful materials at different points of the work zone upon the intensity of formation of welding fumes and power of the welding arc. |
INDUSTRIAL |
Kravchuk L.V., Lyashenko B.A., Tsybanev G.V., Kuriat R.I., Bujskikh K.P. and Nalimov Yu.S. Assessment of the effectiveness of repair technologies for power plant operation |
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Tendencies in development of repair technologies in service of gas turbine engines (GTE) are considered. A procedure was developed for qualitative assessment of the influence of part repair technologies on the set of mechanical characteristics of base material in the repair zone. The effectiveness of the technology is determined by the change of mechanical properties. |
Kozulin S.M., Lychko I.I. and Kozulin M.G. Increase of resistance of welds to formation of crystalline cracks in repair of bands of kiln furnaces using electroslag welding |
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The results of study of causes of appearance of crystalline cracks in central parts of layers of multi-layer electroslag weld are given. The method of increase of resistance of such welds to formation of crystalline cracks applied to repair of damaged bands of rotary kiln furnaces at the site of their operation is developed. |
Kasatkin O.G., Tsaryuk A.K., Skulsky V.Yu., Gavrik A.R. and Moravetsky S.I. Peculiarities of technology of welding pipelines of dissimilar steels in nuclear power engineering |
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The main factors promoting corrosion cracking of welded joints of pipelines from dissimilar steels are analyzed. Welding consumables and technologies allowing improvement of welded joint resistance to local corrosion damages are proposed. |
Pismenny A.S. and Kislitsyn V.M. Influence of weld metal impact treatment on welded joint strength |
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The paper gives the results of experiments on qualitative assessment of the influence of thermomechanical treatment on the strength of spot welded joint. Rationality of shock application of the compressive force at the temperature close to the recrystallisation point of the metal being welded is shown. |
BRIEF INFORMATION |
Dolinenko V.V., Kolyada V.A., Skuba T.G. and Shapovalov E.V. Procedure of evaluation of transportation lags in weld formation ACS |
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A method is suggested for determination of transportation lags in feedback circuit of automatic system for control of weld reinforcement formation process in MAG welding. Mechanism of emergence of two different transportation lags, i.e. formation of weld reinforcement height and width, which are revealed by measurements of its geometric parameters by a laser TV-sensor, has been investigated. To estimate the transportation lags, it is suggested using the regression formulae derived on the basis of computational experimental results. A mathematical model of the weld pool developed for conditions of item heating with the movable normal-circular heat source has been used as an object of the computational experiments. |
Thesis for a scientific degree |
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NEWS |
Technological Seminar of Deloro Stellite in Zaporozhie |
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4th International Seminar «New Directions of Research in the Field of High-Frequency Electric Welding of Soft Live Tissues» |
50 |
Forum-Seminar of Limited Liability Company «Binzel Ukraine» |
52 |
Developed at PWI |
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