| SCIENTIFIC AND TECHNICAL | |
|
Kuchuk-Yatsenko S.I., Kharchenko G.K., Grigorenko G.M., Falchenko Yu.V., Taranova T.G., Gritskiv Ya.P., Zagadarchuk V.F. and Grigorenko S.G.
Heterogeneity of pipe steel joints made by flash butt welding. | 2 |
| Results of examination of physical, chemical and structural inhomogeneity of joints from low-alloyed low-carbon pipe steels made by the flash butt welding are presented. It is shown that changes in chemical composition and metal structure and also the decrease in its density is occurred in the butt at the area corresponding to the location of a light band. Ferritic band and joint line are revealed inside the dark band after appropriate heat treatment and etching. | |
|
Makhnenko V.I., Korolyova T.V. and Lavrinets I.G.
Effect of microstructural transformations on redistribution of hydrogen in fusion welding of structural steels. | 6 |
| Kinetics of distribution of hydrogen in the HAZ metal formed in welding of a root butt joint in structural steel of the A-508 type was investigated by numerical methods. The effect of chemical composition of steel and kinetics of microstructural transformations in the melting zone during welding on a local distribution of hydrogen is shown. | |
|
Shchetinina V.I., Shchetinin S.V., Chapni N.I., Shcherbina A.V., Melnikov A.E. and Golubkov S.P.
Effect of welding speed on welding current magnetic field. | 14 |
| The induction equation has been derived and the effect of welding speed on the welding current electromagnetic field has been established. The electromagnetic theory of formation of undercuts in welding at an increased speed has been developed and experimentally proved. | |
|
Poklyatsky A.G., Ishchenko A.Ya., Grinuyk A.A., Chajka A.A. and Fedorchuk V.E.
Non-consumable electrode argon-arc welding of aluminium alloys with arc oscillations. | 18 |
| The effect of arc oscillations occurring as a result of alternating current passing through the region of filler on the shape of penetration, hardness, structure and mechanical properties of welds in argon-arc non-consumable electrode welding aluminium alloys 1201, AMg6, 1420 and 1460 has been investigated. It is shown that the sizes of penetration of welds depend on values of current passing through the arc gap and the filler wire region, and the frequency of changing their polarities. It was established that at similar depth of penetration the width of welds and degree of weakening of welded joints produced by welding with arc oscillations are less than those in welding with a stationary arc. Intensive stirring of the molten metal and change in conditions of its solidification promote the formation of fine equiaxial dendrites, thus increasing the hardness of weld metal and its strength. | |
| Mikhajlovskaya E.S. , Shulym V.F. and Zagrebelny A.A.
Results of experiments on manual EBW In a manned space simulation test chamber. | 23 |
| The paper presents the results of investigation of samples of aluminium alloy welded joints, made during operator training in the manned spase simulation test chamber using "Universal" hardware for manual electron beam welding. | |
| Dobrushin L.D., Fadeenko Yu.I. and Petushkov V.G.
Special conditions for formation of joints in shock wave welding of metals. | 28 |
| In explosion welding of pure aluminium, the initial region of a joint can be formed under special conditions, corresponding to a high-velocity movement of a contact point. This region of the joint is characterised by high porosity and low strength, and only special measures allow shortening its length or eliminating it completely. An interpretation of the mechanism of formation of cumulative jets is given, attributing it to the instability of flow of the surface metal layer, which is slowed down upon approaching the contact zone of plates. It is suggested that the same mechanism is responsible for the formation of "humps" under conditions of explosion welding involving wave generation. | |
| INDUSTRIAL | |
| Paton B.E. and Gordonny V.G.
Works of the E.O. Paton Electric Welding Institute of the NAS of Ukraine in the field of military tank construction. | 33 |
| History of participation of the E.O. Paton Electric Welding Institute scientists in major works in the field of military tank construction is outlined. The role of the Institute in the development of the technology for automatic submerged-arc welding of armoured hulls and turrets of the legendary tank T-34 during the Great Patriotic Was is described. Stages of progress of work done in the field of arc and electron beam welding as well as special metallurgy for production of armoured hulls of medium and light tanks of different modifications in the post-war period are given. | |
| Blashchuk V.E.
Erection assembly-welding of tubular structures of niobium alloys in the jig. | 40 |
|
Technology of erection assembly-welding of tubular structures of a niobium alloy in the jig and equipment for its performance have been developed. A heat-hydraulic model of a lithium-niobium loop has been welded of individual blocks in site. Control-technological and corrosion testing and testing in a space-vacuum chamber demonstrated the high quality of the field welded joints. | |
| Tyurin Yu.N., Zhadkevich M.L., Golovenko S.I. and Chigrinova N.M.
Deposition of oxide coatings on surfaces of products of aluminium-based alloys. | 44 |
| The theory of conductivity of the electrolyte in a microdischarge process of oxidising of the working surfaces of products from the aluminium-based alloys is considered. Technology and technological fixture for the formation of a porous oxide coating on the surface of piston combustion chamber and a compact coating of up to 150 mm thickness and hardness up to 8 GPa on the inner surface of the cylinder are developed. The technology makes it possible to form the composite coatings with introducing dispersed ceramic particles. The offered technological fixture provides the coating formation on the working surfaces of the products manufactured from the metals used for valves. | |
| Nevidomsky V.A., Krasilnikov S.G., Panin A.D., Gulida V.P. and Lychko I.I.
New machine for electroslag welding of large parts at JSC "NKMBF". | 49 |
| Versatile machine for electroslag welding of large-size plates for welded-forged die blocks of forge-and-press equipment is described. Parallel upgrading of the steel-making technology and starting up of a new machine made it possible to produce quality electroslag welded joints in plates for presses with a capacity of 750 MN. | |
| BRIEF INFORMATION | |
| Zhadkevich M.L., Bondarev A.A., Zelenin V.I., Teplyuk V.M., Sidorenko S.I., Mokhort V.A., Nesterenko Yu.V. and Zelenin O.V.
Technology of restoration of gas turbine blades. | 52 |
| Technology envisages preliminary deposition by microplasma process of a protective coating on high-nickel alloy blade with its subsequent remelting by the electron beam. Programmed heat input provides partial melting of the matrix to not less than 30...50 mkm depth. | |
| Nesterenko N.P.
Optimization of characteristics of electroacoustic transducers for ultrasonic welding of thermoplastic composite materials. | 54 |
| Dependence of electrical and mechanical characteristics of electroacoustic transducers used for ultrasonic welding thermoplastic composite materials on the material of passive elements and position of a piezolayer in the antinode-node system is considered. Comparative analysis is presented for two types of transducers and practical recommendations on optimizing their design are given. | |
| Borisov Yu.S., Sychev V.S. , Shavlovsky E.N., Labunets V.F. and Zolotareva E.P.
Tribological characteristics of composite carbide coatings. | 56 |
| Tribological properties of composite carbide coatings, produced on steel 45 by a combination of thermo-chemical treatment and pretreatment by spark alloying have been studied. It is shown that the composite carbide coatings have high tribological characteristics under the conditions of boundary friction. | |
| NEWS | |
| Visit of the Minister of Foreign Affairs of the Republic of India to the E.O. Paton Electric Welding Institute of the NAS of Ukraine. | 59 |
| Extraordinary and Plenipotentiary Ambassador of the USA to Ukraine is Introduced to the activity of STC "E.O. Paton Electric Welding Institute". | 60 |
| 6th International Seminar "Numerical analysis of weldability". | 62 |
| Professor Detlef von Hofe is 60. | 64 |
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