| SCIENTIFIC AND TECHNICAL | |
|
PATON B.E. MODERN ELECTRON BEAM TECHNOLOGIES OF THE E.O. PATON ELECTRIC WELDING INSTITUTE OF THE NAS OF UKRAINE | 2 |
| Technologies and equipment for EBW, electron beam vapour phase deposition and electron beam melting of titanium from a dispersed melt are described. Advantages of the technologies and examples of their application are considered. | |
|
BRODOVOJ V.A., MIKHEEV P.P. and GUSHCHA O.I. SOME REGULARITIES IN FORMATION OF RESIDUAL STRESSES IN ZONES OF A STRESS RAISER AND FATIGUE CRACK AT CYCLIC LOADING | 8 |
| Using nondestructive acoustic method, the fields of residual stresses occurring in samples (St.3) with a stress raiser at the first cycles of loading and in the process of a growth of the fatigue crack are investigated. It is shown that a biaxial field of residual stresses is formed at a cyclic loading in the zone of a stress raiser. The stress field with a high gradient occurs at a fatigue crack tip. | |
|
GARF E.F., LITVINENKO A.E. and SMIRNOV A.Kh. ASSESSMENT OF FATIGUE LIFE OF TUBULAR CONNECTIONS SUBJECTED TO ULTRASONIC PEENING TREATMENT | 12 |
| Feasibility of extension of life of operating welded structures, made from tubes, by using the peening treatment of the zone of welding is considered. It is shown that the use of a linear hypothesis of accumulation of the fatigue damage is rightful for the estimation of the full life. Moreover, the peening treatment of welded joints increases the material fatigue strength. | |
|
SHURUPOV V.V., PESHKOV V.V., SHUSHPANOV M.N. and KIREEV L.S. FORMATION OF EMBRITTLED LAYERS ON TITANIUM AT ITS INTERACTION WITH STEEL TECHNOLOGICAL FIXTURE UNDER THE CONDITIONS OF DIFFUSION BONDING | 16 |
| In diffusion bonding, the embrittled diffusion layers are formed at the titanium alloy surface as a result of a contact interaction of VT6 alloy products with a steel technological fixture. In contact with steel 12Kh18N10T the process of formation of embrittled layers is controlled by a heterodiffusion of steel components in the diffusion zone, containing intermetallics, while in contact with steel 20 - by carbon diffusion in the carbide-containing layer, interlocking iron diffusion into titanium. | |
|
KUZMIN S.V., LYSAK V.I. and SALOMATIN I.A. METHOD FOR ESTIMATION OF ACCELERATION PARAMETERS OF PLATES IN A MULTILAYER STACK DURING EXPLOSION WELDING | 20 |
| The new calculation-experimental method has been developed for estimation of collision velocity at the initial stage of acceleration for the second and next interfaces in multilayer metal composite materials during explosion welding. It is shown that to calculate collision velocities at the second and next interfaces it is necessary to make allowance for an increase in momentum of the system caused by external forces affecting it within a short period of time between collision at the previous interface and "going out" of the stack welded to a gently sloping acceleration region. | |
|
LANKIN Yu.N. ACOUSTIC EMISSION OF THE WELDING ARC (REVIEW) | 25 |
| Issues concerning generation of acoustic emission in welding, its relationship with the welding process parameters and quality are considered. Possibilities of using acoustic emission for monitoring and automatic adjustment of the welding process are shown. | |
| INDUSTRIAL | |
|
YUSHCHENKO K.A., STARUSHCHENKO T.M. and PESTOV V.A. FERRITIC FILLER METAL FOR WELDING COLD-RESISTANT NICKEL STEELS | 33 |
| Given are the results of research and development of wire for welding cold-resistant nickel steels with 6 and 9 % Ni, providing full-strength welded joints with high toughness and ductility values at a temperature of up to 77 K. It is shown that to ensure low-temperature toughness of the weld made using the Sv-OH12VI wire, it is necessary to create conditions for tempering of the weld metal after each pass, which is achieved by making stringer welds by the short- or immersed-arc multipass welding method. | |
|
LEBEDEV V.A., KOROTYNSKY A.E., MOZOK V.M. and PICHAK V.G. EXPERIENCE OF APPLICATION OF ARC SURFACING WITH A PULSED FEEDING OF ELECTRODE WIRE | 37 |
| Experience gained in restoration of a number of complicated civil engineering objects of Ukraine by the methods of the mechanized arc surfacing using a pulsed feeding mechanisms based on quasi-waved transducers with controllers of electrode wire pulsed feeding parameters, is analyzed. Long-time operation of this type of mechanisms proved their high performance and reliability. It has been revealed that the use of mobile systems, such as a semi-automatic machine with a pulsed feeding - a small-sized arc power supply source, is promising. Special designs of resonance AC arc power sources can be used as a latter for these systems. | |
|
KHASKIN V.Yu., PAVLOVSKY S.Yu., GARASHCHUK V.P., SHELYAGIN V.D.
and GONCHARENKO E.I. PECULIARITIES OF WELDING THIN-SHEET LOW-CARBON STEELS USING A PULSED-PERIODIC RADIATION OF CO2-LASER | 42 |
| It is shown that welding of low-carbon steels using radiation of CO2-laser in a pulsed-periodic mode (PPM) produces more narrow and deeper welds that in a continuous mode at a power of radiation equal to an average power of PPM. At optimum frequency of pulses the structure of the weld root part becomes more regular, the HAZ width is decreased, overheating (coarse-grained) region is either absent or becomes not clearly defined. | |
|
KOROTYNSKY A.E. LIMITING THE OPEN-CIRCUIT VOLTAGE IN RESONANCE WELDING SOURCES | 46 |
| The paper describes different variants of circuits of resonance welding sources incorporating open-circuit voltage limitation modules. Advantages and disadvantages of single- and two-transformer circuits, as well as those with phase regulation of welding current are considered. It is shown that by the energy parameters the most preferable circuit is that with a current-limiting resistor, in which the current drawn from the mains is not more than 0.13 A. The circuit with the phase regulator in the secondary contour, in which the output voltage in the limitation mode can be lowered to 6 V, is characterized by the highest electrical safety. | |
| BRIEF INFORMATION | |
|
TITOV V.A. and PETUSHKOV V.G. INFLUENCE OF EXPLOSION TREATMENT ON CORROSION-MECHANICAL STRENGTH OF WELDED JOINTS | 50 |
| The paper presents the data of fatigue testing and analysis of susceptibility of the metal of cruciform welded samples of low-alloyed steel to the impact of a corroding medium under the conditions simulating the service of off-shore water development works on the continental shelf. It is shown that local explosion treatment of the joints allows a noticeable improvement of their resistance to corrosion-mechanical failures. The results of fatigue testing in air allow forecasting the joints behaviour in sea water at alternating loading. | |
|
KALENSKY V.K., RYABTSEV I.A. and CHERNYAK Ya.P. EXPERIENCE IN SURFACING THE GROOVES FOR LABYRINTH SEALING OF SLUSH PUMP IMPELLERS | 53 |
| The new technology had been developed for surfacing the sealing grooves of the cast impellers for slush pumps made from steel 12Kh18N12M3TL characterized by high corrosion resistance but low hardness. The new flux-cored wire and ingenious surfacing procedure are offered. The deposited metal even in the first layer has hardness equal to HRCe 42-48 and high corrosion resistance, which provides reliable sealing during the entire service life of the impellers. | |
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