Contents of the
Paton
Welding
Journal
no.4, 2001
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Page
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SCIENTIFIC AND TECHNICAL |
ZAMKOV V.N., PRILUTSKY V.P., PETRICHENKO I.K., VRZHIZHEVSKY E.L.
and TOPOLSKY V.F.
EFFECT OF THE METHOD OF FUSION WELDING ON
PROPERTIES OF WELDED JOINTS IN ALLOY Ti-6Al-4V
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2 |
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Mechanical and corrosion properties of arc, electron beam and
laser welded joints in alloy Ti-6Al-4V are compared, allowing for
peculiarities of thermal cycles of laser welding. Susceptibility
of the laser weld metal to stress corrosion cracking in an
aggressive environment is found to be by an order of magnitude
higher than that of the arc weld metal. Annealing of welded
joints does not decrease their sensitivity to cracking.
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ELAGIN V.P., SNISAR V.V., SAVITSKY M.M., GORDAN G.N., VASILIEV
V.G. and DOROSHENKO L.K.
CHEMICAL AND STRUCTURAL INHOMOGENEITY IN
THE ZONE OF FUSION OF LOW-CARBON STEEL WITH AUSTENITIC WELD
DURING SHIELDED-GAS WELDING
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7 |
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It is shown that a poor stirring of molten metal in the weld pool
is one of the causes of increasing the chemical, structural and
mechanical inhomogeneity in the zone of fusion of the low-carbon
steel with an austenitic weld (at a low level of its alloying).
The performance of welding in nitrogen- and oxygen-containing
shielding media improves the metal stirring, thus leading to the
decrease in the level of inhomogeneities in the zone of fusion of
the low-carbon steel with an austenitic weld.
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ZVYAGINTSEVA A.V., YUSHCHENKO K.A. and SAVCHENKO V.S.
EFFECT OF
STRUCTURAL CHANGES IN HIGH-TEMPERATURE HEATING ON DUCTILE
CHARACTERISTICS OF NICKEL ALLOYS
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13 |
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Investigation of hot ductility of alloy IN 840 proves that it has
three characteristic ductility temperature ranges. Drastic fall
in ductility takes place in a narrow temperature range. It
results from melting of grain boundaries to form on them small
amounts of the liquid films. The data of metallography and
fractography obtained on welded samples show that fracture at
high temperatures occurs along the boundaries of grains
(dendrites) rich in alloying elements and is of the same nature
as fracture of the base metal at high temperatures.
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VASENIN Yu.L., ZAGREBELNY A.A., ZELNICHENKO A.T., KRIVTSUN I.V.
and SHULYM V.F.
MODELLING OF THERMAL PROCESSS IN PIPING REPAIR IN
SPACE
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18 |
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A mathematical model of thermal processes in welding of piping in
space is proposed. Software has been developed for implementation
of the above model in the computer. Detailed computer simulation
of thermal processes in stainless tube brazing has been
performed. Optimal geometrical parameters and conditions of the
brazed joint heating are determined, as well as time and energy
required for performance of brazing.
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DMITRIK V.V. and SHEVCHENKO V.V.
EFFECTIVENESS IN USE OF MOLTEN
POOL HEAT
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24 |
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Method for estimation of the amount of the arc heat introduced
into parent metal and transferred with the liquid metal flows
from the head to the tail portion of the weld pool is suggested.
It is shown that the efficiency in use of the molten pool heat
can be increased by using an extra filler metal and selecting the
optimum parameters of welding.
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GONCHAROV I.A., PALTSEVICH A.P., TOKAREV V.S., VEBLAYA T.S. and
KHARCHENKO N.P.
ABOUT THE FORM OF HYDROGEN EXISTENCE IN WELDING
FUSED FLUXES
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27 |
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The forms of hydrogen existence in welding fused flux AN-348A
were examined using the methods of IR-spectroscopy,
thermogravimetry and gas chromatography. As model substances the
zeolite NaA and kaolin were used. A significant difference of
flux AN-348A from the zeolite is shown by a nature of a thermal
hydrogen desorption. It is established that the main part of the
latter is dissolved in the flux examined during the process of
furnace melting in the form of a hydroxyl and removed at heating
above 800 oC.
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POPOV S.N.
OPTIMIZATION OF CHEMICAL COMPOSITION OF DEPOSITED
METAL OF COMPONENTS OPERATING UNDER THE CONDITIONS OF ABRASIVE
WEAR
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31 |
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Results of planning and processing of experimental data to
optimize the chemical composition of the deposited metal
possessing high wear resistance are presented. The effect of
carbon, boron and vanadium in ferro-chromium (13 % Cr) alloys on
their resistance to the abrasive wear is determined.
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INDUSTRIAL |
40 YEARS OF PILOTED COSMONAUTICS.
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34 |
LANKIN Yu.N. and GAVRISH S.S.
DEVICE FOR PROVISION OF SAFE
OPERATION OF MANUAL ELECTRON BEAM TOOL IN SPACE
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36 |
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A device for protection from the electron beam in manual electron
beam welding in space is described. The device operation is based
on short-term (0.002 s) probing with the electron beam of the
surfaces being welded. When the distance from the gun to the
surfaces being welded is increased above the working distance,
the device lowers the beam power density to a safe level and (or)
completely switches the beam off.
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BULATSEV K.A. and BULATSEV A.A.
SYSTEM OF MONITORING THE POSITION
OF MANUAL ELECTRON BEAM TOOL
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39 |
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The paper deals with a system of welding tool position
monitoring, based on the use of a PC and indirect information
input device. The device block-diagram, operational algorithm and
schematic of the actual embodiment of the sensor are given, as
well as testing results.
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TOCHIN V.V., YUSHCHENKO B.I., RUSINOV P.P., DEMIANENKO V.V. and
PALAMARCHUK T.E.
SAFETY SYSTEM OF ELECTRON BEAM TOOL
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42 |
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One of the possible variants of ensuring the safety can be the
use of "technical vision" for automatic control of aiming the
beam into the working zone. A safety system is described that is
based on processing the video information received from the
welding zone.
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PROKOFIEV A.S., PISMENNY A.S., BONDAREV V.A. and BONDAREV A.V.
INDUCTION BRAZE-WELDING OF NO-ACCESSORY T-JOINTS IN PIPES
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44 |
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Types of designs of no-accessory T-joints and methods for their
manufacture are analysed. The technology for production of
T-joints in thin-walled small-diameter pipes using braze-welding,
as well as strength characteristics of the T-joints and their
capability of preserving shape and geometrical dimensions under
loading during mechanical tests are considered.
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NESTERENKO N.P., SENCHENKOV I.K., CHERVINKO O.P. and DYACHENKO
S.M.
DESIGNING OF MULTISTAGE WAVEGUIDES-TOOLS FOR ULTRASONIC
WELDING OF THERMOPLASTIC MATERIALS
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49 |
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Method of designing multistage waveguides for ultrasonic welding
of polymers and composites on a thermoplastic base has been
suggested. Known and new basic configurations of waveguides,
which can be used for welding at different levels with respect to
the support, are considered.
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NAJDA V.L., MOZZHUKHIN A.A., GETMAN V.V., PYSHNY V.M. and TOROP
V.M.
INTEGRATED APPROACH IN TECHNICAL DIAGNOSTICS OF PIPELINES IN
AUTOMATIC ULTRASONIC TESTING OF BUTT WELDS
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52 |
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Capabilities of modern AUT means, developed in E.O. Paton
Electric Welding Institute have been considered. It is shown that
since the parameters characterizing the objects of diagnostics,
defects, loading conditions and mechanical properties of the
materials can vary in time, an integrated approach is effective,
provided computerized systems are used.
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BRIEF INFORMATION |
PETUSHKOV V.G. and TITOV V.A.
PARAMETERS OF SHOCK-WAVE LOADING
USED TO RELIEVE RESIDUAL WELDING STRESSES BY EXPLOSION TREATMENT
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57 |
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Results are given on the use of methods developed for
investigation of pressures and strains induced in a welded joint
metal loaded by sliding detonation of a cord explosive charge to
relieve residual welding stresses. It is shown that the use of
the methods makes it possible to obtain sufficiently reliable
results needed for theoretical description of the mechanism of
relief of residual stresses by explosion treatment of welded
joints.
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