Contents of the
Paton
Welding
Journal
no.7, 2001
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Page
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SCIENTIFIC AND TECHNICAL |
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.
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2 |
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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.
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6 |
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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.
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11 |
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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
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16 |
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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.
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20 |
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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.
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INDUSTRIAL |
TARASOV N.M. AND KAPUSTIN S.S.
ARC SPOT WELDING OF ALUMINIUM ALLOY THIN-SHEET ELEMENTS USING A DROP DOSING OF ELECTRODE METAL.
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24 |
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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.
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27 |
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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.
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33 |
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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
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37 |
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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.
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44 |
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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.
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48 |
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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.
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ADVERTISING.
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