| SCIENTIFIC AND TECHNICAL | |
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MAKHNENKO V.I., SHEKERA V.M., KRAVTSOV T.G. AND SEVRYUKOV V.V.
EFFECT OF SUBSEQUENT MECHANICAL TREATMENT ON REDISTRIBUTION OF RESIDUAL STRESSES IN SURFACED SHAFTS. | 2 |
| Residual stresses formed in surfaced shafts and influencing their cyclic loading resistance have been experimentally studied. It is shown that subsequent mechanical treatment of the shafts (roll burnishing, ultrasonic shock peening, explosion treatment) induces compressive stresses in the surface layer. | |
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TRUFYAKOV V.I., SHONIN V.A., MASHIN V.S. AND ROMANOVSKY D.S.
APPLICATION OF HIGH-FREQUENCY PEENING TO IMPROVE THE FATIGUE RESISTANCE OF BUTT WELDED JOINTS IN ALUMINIUM ALLOYS. | 6 |
| The boundaries of welds on 12 mm thick samples were subjected to high-frequency peening in order to improve the fatigue resistance of butt welded joints in aluminium alloy AMg6. It is shown that treatment effectiveness depends on the power of ultrasonic generator and converter applied for excitation of vibrations in an array of needle-shaped pins, as well as on pin diameter. The best results were obtained, using an ultrasonic unit of 0.3 kW consumed power with three pins of 5 mm diameter for the region of alternating stresses (Rs = -1-0) and four pins of 2 mm diameter - for the region of stresses of a constant sign (Rs > 0). | |
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LABUR T.M., BONDAREV R.A., LOZOVSKAYA A.V., MASHIN V.S. AND POKLYATSKY A.G.
INFLUENCE OF WELDING PROCESS ON FRACTURE RESISTANCE OF JOINTS IN ALUMINIUM-LITHIUM ALLOYS 1420 AND 1460. | 11 |
| A dependence is established of fracture resistance of welded joints in Al--Li alloys 1420 and 1460 on the welding process (consumable or non-consumable electrode, electron beam). It is shown that different thermal conditions of welding lead to different degrees of HAZ metal softening. Application of a highly-concentrated heat source in electron beam welding, ensures a higher resistance to crack initiation and propagation. The metal of the fusion boundary of the weld with the base metal has the lowest fracture resistance of all the studied zones of welded joints, irrespective of the joining process. | |
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LAZEBNOV P.P.
STATISTIC ANALYSIS OF CORROSION RESISTANCE OF CHROMIUM-NICKEL DEPOSITED METAL IN ALKALI SOLUTIONS | 16 |
| Results of comparative corrosion tests of Cr-Ni deposited metal in alkali solutions are given. Correlation and regression analyses are made, thus examining the interrelation between the input (d-ferrite in welds) and output (rate of metal corrosion) parameters. | |
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GONCHAROV I.A., PALTSEVICH A.P. AND TOKAREV V.S.
EFFECT OF HYDROGEN IN LOW-ALLOYED WELD METAL ON PORE FORMATION IN SUBMERGED ARC WELDING. | 20 |
| The content of diffusive and residual hydrogen in the deposited and weld metal was determined using the method of a gas chromatography in welding with fused manganese-silicate fluxes of AN-348A, AN-60 and AN-60SM grades. It was established that the critical content of hydrogen in weld during SAW at which the pores are formed, does not depend on the flux grade and amounts to 12-14 cm3 H2/100 g of weld metal that is equal to the hydrogen solubility in d-iron at melting temperature and 105 Pa pressure. | |
| INDUSTRIAL | |
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TARASOV N.M. AND KAPUSTIN S.S.
ARC SPOT WELDING OF ALUMINIUM ALLOY THIN-SHEET ELEMENTS USING A DROP DOSING OF ELECTRODE METAL. | 24 |
| The technology of joining thin elements (0.8-2.0 mm), made from aluminium alloys, by the argon-arc welding with use of a drop dosing of the electrode metal, is described. The process of arc welding is presented, its main parameters are given and the strength of the joints is examined. Recommendations are given on the selection of conditions of butt joint welding. | |
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BARVINKO YU.P., GOLINKO V.M., BARVINKO A.YU., PERELMUTER A.V. AND
KULEBA G.V.
IMPROVEMENT OF PERFORMANCE OF VERTICAL ERECTION WELDED JOINTS IN THE WALL OF CYLINDRICAL TANKS MADE OF COILED BLANKS. | 27 |
| The paper analyses different methods of making vertical erection joints in tanks built of coiled blanks. It is suggested that in repair of erection joints in the currently used tanks and in construction of new tanks, the butt joint should be made by welding-in special sheet inserts. Theoretical estimation of local stresses in the tank wall after welding-in the inserts is presented, allowing for actual radial distortions of the wall. | |
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POKLYATSKY A.G. AND GRINYUK A.A.
EFFECT OF PARAMETERS OF ASYMMETRIC AND MODULATED CURRENTS ON QUALITY OF ALUMINIUM ALLOY WELDED JOINTS. | 33 |
| The effect of parameters of the asymmetric and modulated currents on the length of oxide film inclusions in the welds and porosity of the joints in alloys AMg6, 1420 and 1460 produced by a pulsed-arc TIG welding is considered. The use of the asymmetric current allows a decrease of 3 times in the relative length of the oxide film inclusions in the AMg6 alloy welds and reduces the probability of formation of whisker inclusions in the welds. Efficient degassing of the molten pool metal is achieved in the case of using the modulated current with a modulation frequency of 5 Hz. | |
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YUSHCHENKO K.A., KOVALENKO D.V. AND KOVALENKO I.V.
APPLICATION OF ACTIVATORS FOR TIG WELDING OF STEELS AND ALLOYS | 37 |
| The E.O. Paton Electric Welding Institute developed a new generation of activating fluxes. Data are given on the application of the aerosol activating fluxes (activators) of the PATIG series intended for welding stainless steels of the 300 (301, 304, 316, 320, etc.) and 400 (401, 416, etc.) grades, duplex steels, nickel alloys of the Nimonik, Hastelloy and Inconel types, and heat-resistant and high-temperature steels. Technological and economical advantages of manual and mechanized welding of thin and thick metal in making butt, corner, overlap and T-joints in the form of different structures are presented. | |
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RADZIYEVSKY V.N., TKACHENKO G.G. AND GARTSUNOV YU.F.
AUTOVACUUM BRAZING OF STEEL IMPELLERS OF CENTRIFUGAL COMPRESSORS. | 44 |
| It is shown that argon-arc welding combined with brazing to form a large fillet of a metal powder can provide a reliable T-joint in hard-of-access channels in the centrifugal compressor impellers. Simple-to-perform autovacuum heating applied for brazing allows cleaning of surfaces prior to melting of a brazing filler alloy, promotes formation of the frame of a powder in a large fillet and creates conditions for formation of a composite metal structure with required mechanical properties. | |
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ZYAKHOR I.V. MODERN EQUIPMENT FOR FRICTION WELDING. | 48 |
| Current trends in development of equipment for friction welding and peculiarities of design of machines for its modifications, such as conventional, inertia and combined friction welding, are analysed. The work performed at the E.O. Paton Electric Welding Institute in the area of development and manufacture of the friction welding facilities is described. Peculiarities of design of the ST-120 machine, which can serve as the baseline model for a new generation of the friction welding machines, are presented. | |
| ADVERTISING. | 53 |
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