KUCHUK-YATSENKO S.I., KHARCHENKO G.K., GRIGORENKO G.M.,
FALCHENKO YU.V., TARANOVA T.G., GRITSKIV YA.P., ZAGADARCHUK V.F. AND
GRIGORENKO S.G. Heterogeneity of pipe steel joints made
by flash butt
welding.
Results of examination of physical,
chemical and structural inhomogeneity of joints from low-alloyed
low-carbon pipe steels made by the flash butt welding are presented. It is
shown that changes in chemical composition and metal structure and also
the decrease in its density is occurred in the butt at the area
corresponding to the location of a light band. Ferritic band and joint
line are revealed inside the dark band after appropriate heat treatment
and etching. |  2 |
MAKHNENKO V.I., KOROLYOVA T.V. AND
LAVRINETS I.G.
Effect of microstructural transformations on redistribution of
hydrogen in fusion welding of structural
steels.
Kinetics of distribution of hydrogen
in the HAZ metal formed in welding of a root butt joint in structural
steel of the A-508 type was investigated by numerical methods. The effect
of chemical composition of steel and kinetics of microstructural
transformations in the melting zone during welding on a local distribution
of hydrogen is shown. | 6 |
SHCHETININA V.I., SHCHETININ S.V., CHAPNI N.I.,
SHCHERBINA A.V., MELNIKOV A.E. AND
GOLUBKOV S.P. Effect of welding
speed on welding
current magnetic field.
The induction equation has been
derived and the effect of welding speed on the welding current
electromagnetic field has been established. The electromagnetic theory of
formation of undercuts in welding at an increased speed has been developed
and experimentally proved.
| 14 |
POKLYATSKY A.G., ISHCHENKO A.YA., GRINUYK A.A., CHAJKA
A.A. AND FEDORCHUK V.E. Non-consumable electrode argon-arc welding of
aluminium alloys with arc oscillations.
The effect of arc oscillations
occurring as a result of alternating current passing through the region of
filler on the shape of penetration, hardness, structure and mechanical
properties of welds in argon-arc non-consumable electrode welding
aluminium alloys 1201, AMg6, 1420 and 1460 has been investigated. It is
shown that the sizes of penetration of welds depend on values of current
passing through the arc gap and the filler wire region, and the frequency
of changing their polarities. It was established that at similar depth of
penetration the width of welds and degree of weakening of welded joints
produced by welding with arc oscillations are less than those in welding
with a stationary arc. Intensive stirring of the molten metal and change
in conditions of its solidification promote the formation of fine
equiaxial dendrites, thus increasing the hardness of weld metal and its
strength.
| 18 |
MIKHAJLOVSKAYA E.S. , SHULYM V.F. AND ZAGREBELNY A.A.
Results of experiments on manual EBW In a manned space simulation test
chamber.
The paper presents the results of
investigation of samples of aluminium alloy welded joints, made during
operator training in the manned spase simulation test chamber using
"Universal" hardware for manual electron beam welding.
| 23 |
DOBRUSHIN L.D., FADEENKO YU.I. AND PETUSHKOV V.G.
Special conditions for formation of joints in shock wave welding of
metals.
In explosion welding of pure
aluminium, the initial region of a joint can be formed under special
conditions, corresponding to a high-velocity movement of a contact point.
This region of the joint is characterised by high porosity and low
strength, and only special measures allow shortening its length or
eliminating it completely. An interpretation of the mechanism of formation
of cumulative jets is given, attributing it to the instability of flow of
the surface metal layer, which is slowed down upon approaching the contact
zone of plates. It is suggested that the same mechanism is responsible for
the formation of "humps" under conditions of explosion welding involving
wave generation.
| 28 |
PATON B.E. AND GORDONNY V.G.
Works of the E.O. Paton
Electric Welding Institute of the NAS of Ukraine in the field of military
tank construction.
History of participation of the E.O.
Paton Electric Welding Institute scientists in major works in the field of
military tank construction is outlined. The role of the Institute in the
development of the technology for automatic submerged-arc welding of
armoured hulls and turrets of the legendary tank T-34 during the Great
Patriotic Was is described. Stages of progress of work done in the field
of arc and electron beam welding as well as special metallurgy for
production of armoured hulls of medium and light tanks of different
modifications in the post-war period are given.
| 33 |
BLASHCHUK V.E. Erection assembly-welding of tubular
structures of niobium alloys in the jig.
Technology of erection
assembly-welding of tubular structures of a niobium alloy in the jig and
equipment for its performance have been developed. A heat-hydraulic model
of a lithium-niobium loop has been welded of individual blocks in
site. Control-technological and corrosion testing and testing in a
space-vacuum chamber demonstrated the high quality of the field welded
joints.
| 40 |
TYURIN YU.N., ZHADKEVICH M.L., GOLOVENKO S.I. AND
CHIGRINOVA N.M. Deposition of oxide coatings on surfaces of products
of aluminium-based alloys.
The theory of conductivity of the
electrolyte in a microdischarge process of oxidising of the working
surfaces of products from the aluminium-based alloys is considered.
Technology and technological fixture for the formation of a porous oxide
coating on the surface of piston combustion chamber and a compact coating
of up to 150 mm thickness and hardness up to 8 GPa on the inner surface of
the cylinder are developed. The technology makes it possible to form the
composite coatings with introducing dispersed ceramic particles. The
offered technological fixture provides the coating formation on the
working surfaces of the products manufactured from the metals used for
valves. | 44 |
NEVIDOMSKY V.A., KRASILNIKOV S.G., PANIN A.D., GULIDA
V.P. AND LYCHKO I.I. New machine for electroslag welding of large
parts at JSC "NKMBF".
Versatile machine for electroslag
welding of large-size plates for welded-forged die blocks of
forge-and-press equipment is described. Parallel upgrading of the
steel-making technology and starting up of a new machine made it possible
to produce quality electroslag welded joints in plates for presses with a
capacity of 750 MN.
| 49 |
ZHADKEVICH M.L., BONDAREV A.A., ZELENIN V.I., TEPLYUK
V.M., SIDORENKO S.I., MOKHORT V.A., NESTERENKO YU.V. AND ZELENIN O.V.
Technology of restoration of gas turbine blades.
Technology envisages preliminary
deposition by microplasma process of a protective coating on high-nickel
alloy blade with its subsequent remelting by the electron beam. Programmed
heat input provides partial melting of the matrix to not less than 30...50
mkm depth.
| 52 |
NESTERENKO N.P. Optimization of characteristics of
electroacoustic transducers for ultrasonic welding of thermoplastic
composite materials.
Dependence of electrical and
mechanical characteristics of electroacoustic transducers used for
ultrasonic welding thermoplastic composite materials on the material of
passive elements and position of a piezolayer in the antinode-node system
is considered. Comparative analysis is presented for two types of
transducers and practical recommendations on optimizing their design are
given.
| 54 |
BORISOV YU.S., SYCHEV V.S. , SHAVLOVSKY E.N., LABUNETS
V.F. AND ZOLOTAREVA E.P. Tribological characteristics of composite
carbide coatings.
Tribological properties of composite
carbide coatings, produced on steel 45 by a combination of thermo-chemical
treatment and pretreatment by spark alloying have been studied. It is
shown that the composite carbide coatings have high tribological
characteristics under the conditions of boundary friction.
| 56 |
Visit of the Minister of Foreign Affairs of the Republic
of India to the E.O. Paton Electric Welding Institute of the NAS of
Ukraine.
| 59 |
Extraordinary and Plenipotentiary Ambassador of the USA
to Ukraine is Introduced to the activity of STC "E.O. Paton Electric
Welding Institute".
| 60 |
6th International Seminar "Numerical analysis of
weldability".
| 62 |
Professor Detlef von Hofe is 60
| 64 |
English
