Contents of
the Paton
Welding
Journal
no.6, 2000
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Page
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GARF E.F., NETREBSKIY M.A., YUKHIMETS P.S. and KOBELSKIY S.V.
STRESS CONCENTRATION IN THE AREAS OF CORROSION DAMAGE OF PIPELINES
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2
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Finite element method and electric stain measurement means were
used to study the concentration of stresses in the zone of
corrosion damage of pipelines, simulated by the surface of an
ellipsoid and a cylinder. It is shown that these defects can
create a risk of cyclic elasto-plastic fracture while the
required level of static strength is ensured. An approximate
dependence for determination of stress concentration in the zone
of surface corrosion damage has been determined more precisely.
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SHLEPAKOV V.N., KOTELCHUK A.S. and NAUMEIKO S.M.
EFFECT OF NITRIDE-FORMING ELEMENTS ON COMPOSITION AND STRUCTURE
OF LOW-ALLOYED WELD METAL
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6
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The effect of a complex alloying with nitride-forming elements on
structure of a low-alloyed weld metal is studied. A feasibility
of prediction of the primary microstructure of a single-pass weld
is shown.
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KUCHUK-YATSENKO S.I., KHARCHENKO G.K., FALCHENKO Yu.V.,
TARANOVA T.G. and GRIGORENKO S.G.
FEATURES OF FERRITE BAND FORMATION IN VACUUM PRESSURE WELDING OF
STEEL
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10
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The features of formation of a ferrite band in vacuum impact and
diffusion welding of low carbon steels were studied. It is shown
that it forms as a result of several processes occurring at the
stages of heating, upsetting and cooling. The mechanism of
ferrite band formation is proposed as a combined action of the
diffusion and recrystallization processes.
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PROTSENKO P.P. and PRIVALOV N.T.
OPTIMIZING OF COMPOSITION AND TECHNOLOGICAL PROPERTIES OF
ELECTRODE WIRE Sv-08KhG2SNMT FOR SHIELDED-GAS WELDING OF
HEAT-TREATED LOW-ALLOYED HIGH-STRENGTH STEEL
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16
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The influence of main alloying elements in the wire on the
effective ionization potential of the arc atmosphere and the
thermodynamic activity of elements in multicomponent iron-based
melts is considered. Welding and technological properties of
Sv-08KhG2SNMT electrode wire were studied in comparison with
series-produced wires. It is shown that complex alloying of the
wires with chromium, nickel, molybdenum and titanium within
optimum limits in a wide range of test temperatures provides a
high impact strength of the weld metal which is attributable to
its favourable structure.
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PATON B.E., LAKOMSKY V.I., PETROV B.F. and KOROTYA A.S.
IN A UNION WITH METALLURGISTS AND WELDERS - TO ENERGY-SAVING
TECHNOLOGIES
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22
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Experience accumulated by scientists of the E.O. Paton Electric
Welding Institute and specialists of the Open Joint Stock Company
"Ukrainian Graphite" in the area of energy saving in production
of graphitized electrodes is described. A new design of the short
power circuit of graphitizing furnaces, welded carbon material -
aluminium contacts and technology for field welding of the short
circuit are proposed.
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ISHCHENKO A.Ya., BONDAREV A.A., NAZARENKO S.V. and BONDAREV
Andr.A.
TECHNOLOGY OF ELECTRON BEAM WELDING OF HIGH-STRENGTH ALUMINIUM
ALLOY STRINGER PANELS
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27
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Comparative estimation of methods of manufacture of light
stiffened panels of aluminium alloys is shown. Advantages of the
electron beam welding process for manufacture of thin-walled
panels from high-strength heat-hardened aluminium alloys are
given. Technology of a single-sided welding of stiffeners of thin
sheets and plates at ratio of thicknesses from 1:1 to 1:15 and
higher is developed. It was established that the programmed heat
input within the circuit of the electron beam scanning during
welding is the most effective means of control of weakening and
shape of penetration zone of T-joints.
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SHEIKO P.P., ZHERNOSEKOV A.M. and SHEVCHUK S.A.
REDUCTION OF METAL SPATTER IN CONSUMABLE-ELECTRODE WELDING IN CO2
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31
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New approach to the solution of problem of a spattering decrease
during CO2 welding is suggested. It consists in the fact that
short circuits are created continuously with the help of
electronic methods according to a preset program. A pilot model
of the welding equipment using IGBT transistor is manufactured.
The application of the mentioned approach allows the metal
spattering to be decreased by 40-50 %.
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ARSENYUK V.V.
NEW METHOD FOR THE MANUFACTURE OF THERMOCHEMICAL CATHODES FOR
PLASMATRONS
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34
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Results of investigations on vacuum percussion welding of
zirconium and hafnium to copper for the manufacture of
thermochemical cathodes for plasmatrons are given. Thechnological
parameters of welding and forming of parts are determined. The
technology and equipment developed for the manufacture of four
types of the thermochemical cathodes are described. The new
method for the manufacture of the thermochemical cathodes allows
substantial saving of scarce metals, improvement in reliability
and extension of service life of plasma installations.
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MUZHICHENKO A.F.
PACKAGE OF PROGRAMS FOR PREDICTION OF MICROSTRUCTURE AND
MECHANICAL PROPERTIES OF HAZ METAL IN WELDING OF STRUCTURAL
STEELS
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38
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The described software enables computation of structure and
mechanical properties of the HAZ metal in welding of structural
steels on the basis of t8/5 determined from the heat models,
steel grade from the computer atlas of the austenite
decomposition diagrams or chemical composition of steel from the
regression models.
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KOROTYNSKY A.E.
DISCRETE-TIME CONTROL OF WELDING CURRENT IN POWER SOURCES OF LC
TYPE
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42
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Device with a discrete-time controller of welding current, based
on thyristor-semistor commutator, is described. It is shown that
its application in the secondary circuit makes the schematic
diagram of the LC type power source much simplier. Results of
technological tests of this device in welding using the rutile
stick electrodes are given.
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ZHUDRA A.P. and KIRILYUK G.A.
FLUX-CORED WIRES FOR SURFACING
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45
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SEMINAR ON TECHNOLOGICAL EXPERIMENTS IN ORBITAL PILOTED SPACE
STATIONS
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47
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ADVERTISING
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48
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