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SCIENTIFIC AND TECHNICAL
MAKHNENKO V.I., VELIKOIVANENKO E.A., KRAVTSOV T.G. and SEVRYUKOV V.V.
NUMERICAL STUDIES OF THERMOMECHANICAL PROCESSES IN SURFACING OF SHAFTS OF SHIP MECHANISMS
2
Calculation method is presented for evaluation of the range of optimal parameters for the technology of corrosion-resistant surfacing of shafts in ship mechanisms and systems. The method is based on taking into account the potential formation of fatigue cracks at cyclic loading in service.
LESKOV G.I. and PUSTOVOJT S.V.
ABOUT THE PROBLEM OF CONSTRUCTION OF A DYNAMIC MODEL OF WELD POOL IN ELECTRIC ARC WELDING
11
Theoretical and experimental investigations of weld pool in comparison with an existing quasi-static model are analyzed. Contradictions and drawbacks, typical of this model, are outlined. The more perfect dynamic model was constructed and described on the basis of available data, laws of motion of liquids and gases and equations of electrodynamics.
VITYAZ P.A., LOVSHENKO F.G. and LOVSHENKO G.F.
NEW HIGH-RESISTANT DISPERSION-STRENGTHENED COPPER MATERIALS FOR RESISTANCE WELDING ELECTRODES
16
Method of selection of initial elements and prediction of phase composition of the dispersion-strengthened copper is described. Technology of manufacture of the material using the method of a mechanical alloying is optimized. Phase composition, structure and properties of the produced material are examined and optimum conditions of the resistance welding with electrodes made from this material are established. It is shown that the application of the dispersion-strengthened copper provides increase in life of products by 2-3 times.
MARCHUK V.E., LABUNETS V.F. and DEREK I.B.
DETONATION COATINGS OF Ni-BASED COMPOSITE MATERIALS Information 3. TRIBOTECHNICAL PROPERTIES
22
Influence of a flux additive (sodium tetraboride) on the composition, structure and tribotechnical properties of a detonation coating of Ni-Cr-Fe-Si-B-Al-WC system was studied. At its optimal volume fraction of 50 %, a favourable structure of the coating, lower friction coefficient and increase of the relative wear resistance are achieved.
INDUSTRIAL
NAZARENKO O.K., ORSA Yu.V. and STOLIKO G.Ya.
PROSPECTS FOR ELECTRON BEAM WELDING OF BIMETAL BAND SAWS AND SAW BLADES IN UKRAINE
26
Analysed is the ability of Ukrainian organisations to set up production of band saws and hack-saws in the bimetal variant, when the cutting part of the tool is made of high-speed steel, and the base - of carbon or low-alloyed steel. Given are the results of studying the technology of electron beam welding (EBW) and heat treatment of various combinations of steel, as well as industrial application of the locally-made equipment.
YUSHTIN A.N., ZAMKOV V.N., SABOKAR V.K., CHVERTKO P.N. and PETRICHENKO I.K.
PRESSURE WELDING OF INTERMETALLIC ALLOY g-TiAl
33
Pressure welding of intermetallic alloy g-TiAl with and without interlayers was studied. It is shown that interlayers of aluminium and titanium fail to provide joints with properties close to those of the base metal. The technology is suggested for welding without an interlayer by heating generated by the electric current flow and plastic deformation at a rate of up to 2 mm/s. Metal of the welded joints made by this technology has strength equal to that of the base metal.
TYURIN Yu.N., KOLISNICHENKO O.V. and TSYGANKOV N.G.
PULSE-PLASMA HARDENING OF TOOLS
38
The resource-saving technology has been developed for pulse-plasma hardening of tools. The technology is characterized by low consumption of alloying elements and electric power and high productivity (up to 0.5 m2/h). It allows hardening (heating) of only the working (cutting) surfaces, which leads to an increase in wear resistance without any change in structural state of a workpiece as a whole. Power consumption of the machine is 10 kW.
BORISOV Yu.S., PANKO M.T., ADEEVA L.I., RUPCHEV V.L. and BOBRIK V.G.
TECHNOLOGIES FOR PRODUCTION AND PROPERTIES OF POWDERS OF THE Al-Cu-Fe SYSTEM FOR THERMAL SPRAYING OF COATINGS WITH QUASICRYSTALLINE STRUCTURE
45
Effect of the technology for production of powders of the Al-Cu-Fe system on their structure, phase composition, physical and technological properties was investigated. The effect of annealing of the spray powders on their content of the quasicrystalline y-phase was established.
BRIEF INFORMATION
PETUSHKOV V.G., BRYZGALIN A.G. and TITOV V.A.
MECHANISM OF RELAXATION OF RESIDUAL STRESSES IN EXPLOSION LOADING OF WELDED JOINTS
51
Procedure of approximate calculation of stresses and strains in the trace formed in a relaxing material by a single shock-wave compression is described. The results obtained can be used in determination of parameters of explosion loading to relieve the residual stresses in welded joints of metal structures. P. 51
BURSKY G.V. and SAVITSKY M.M.
HYDROGEN CONTENT IN LOW-ALLOYED WELD METAL IN TWIN-ARC WELDING
54
The effect of twin-arc welding on hydrogen content in low-alloyed weld metal was investigated. It was established that, as compared with a single-arc welding, the twin-arc welding can decrease significantly the amount of [H]diff in weld metal that is due greatly to the peculiarities of the thermal cycle.
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