International Scientific-Technical and Production Journal
July
2011
# 7
English translation of the monthly «Avtomaticheskaya Svarka» (Automatic Welding) journal published in Russian since 1948
Editor-in-Chief B.E.Paton
Yu.S.Borisov V.F.Khorunov
A.Ya.Ishchenko I.V.Krivtsun
B.V.Khitrovskaya L.M.Lobanov
V.I.Kyrian A.A.Mazur
S.I.Kuchuk-Yatsenko
Yu.N.Lankin I.K.Pokhodnya
V.N.Lipodaev V.D.Poznyakov
V.I.Makhnenko K.A.Yushchenko
O.K.Nazarenko A.T.Zelnichenko
I.A.Ryabtsev
CONTENTS
SCIENTIFIC AND TECHNICAL
. and
. and
. and
N.P.Alyoshin (Russia)
U.Diltey (Germany)
Guan Qiao (China)
D. von Hofe (Germany)
V.I.Lysak (Russia)
N.I.Nikiforov (Russia)
B.E.Paton (Ukraine)
Ya.Pilarczyk (Poland)
G.A.Turichin (Russia)
Zhang Yanmin (China)
A.S.Zubchenko (Russia)
V.N.Lipodaev, V.I.Lokteva
A.T.Zelnichenko (exec. director)
A.A.Fomin, O.S.Kurochko,
I.N.Kutianova, T.K.Vasilenko
N.A.Dmitrieva
D.I.Sereda, T.Yu.Snegiryova
.
Peculiarities of the influence of complex alloying on
structure formation and mechanical properties of welds on
low-alloyed high-strength steels ................................................... 11
. Damping of welding current fluctuations in
robotic arc welding ...................................................................... 18
. and
.
Peculiarities of formation of structure in the transition zone
of the Cu—Ta joint made by explosion welding ............................... 20
. 137Cs and 90Sr phase transitions in
. and
surfacing of radioactively contaminated metal structures ............... 26
INDUSTRIAL
. and
. System for automatic
regulation of position of tungsten electrode in narrow-gap
magnetically controlled arc welding of titanium ............................. 30
. and
. and
State Registration Certificate
KV 4790 of 09.01.2001
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This publication and each of the articles
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© PWI, International Association «Welding», 2011
. and
NEWS
International Specialized Exhibition «Welding, Cutting,
Surfacing» ................................................................................... 46
International Conference «Surface Engineering and
Renovation of Parts» .................................................................... 49
Laser Technology Conference in Ukraine ...................................... 51
.
Assessment of the effectiveness of composite bands for
reconditioning of defective sections of pipelines ........................... 37
. Development of a sensor for
estimation of the rate of corrosion of welded metal
structure under atmospheric conditions ........................................ 42
.
Electron beam welding in production of steel-aluminium
joints of transition pieces of dissimilar metals ................................ 34
.
Friction stir welding of composite, granulated and
quasicrystalline aluminium alloys ................................................... 2
.
Force effect on welded surfaces initiated by running of
SHS reaction in nanolayered interlayer .......................................... 7
Pub
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isher:
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Poklyatsky A.G., Ishchenko A.Ya
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Falchenko Yu.V., Petrushinets L.V
Fedorchuk V.E
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Bondarev A.A., Nesterenkov V.M
Akhonin S.V
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Стр.1
FRICTION STIR WELDING OF COMPOSITE,
GRANULATED AND QUASICRYSTALLINE
ALUMINIUM ALLOYS
A.G. POKLYATSKY, A.Ya. ISHCHENKO and V.E. FEDORCHUK
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
Structural peculiarities and mechanical properties of welded joints on strengthened aluminium alloys are studied. It is
shown that the use of friction stir welding does not lead to any substantial phase-structural changes in the weld metal
and adjoining regions.
Keywords: friction stir welding, granulated aluminium alloys,
composites, meta-stable quasicrystalline particles
One of the important trends in current engineering is
decrease in weight and dimensions of structures with
retention of their functional capabilities. Particular
emphasis is placed on these requirements in manufacture
of aircraft and spacecraft engineering products,
overland and water transport. During the last decades
this problem has been addressed through a wider utilisation
of new high-strength aluminium alloys with
high indicators of specific strength, elasticity modulus,
corrosion resistance and resistance to propagation
of fatigue cracks in the process of operation. However,
the possibilities for further improvement of properties
of commercial aluminium alloys produced by the traditional
methods of casting and subsequent rolling
have practically been exhausted. Therefore, a substantial
improvement of performance of parts can be
achieved by manufacturing them from qualitatively
new advanced materials based on aluminium alloys.
Such materials include modern granulated aluminium
alloys strengthened by dispersed intermetallics that
contain oversaturated solid solution of transition metals,
composite materials reinforced by dispersed
nanosized particles, and alloys strengthened by metastable
quasicrystalline particles produced at high solidification
rates. However, realisation of potential
Table 1. Composition and tensile strength of 2 mm thick sheets
of composite materials based on aluminium alloys
Content and
Matrix alloy
composition of
reinforcing
particles
AMg5 27 % Al2
AL25 25 % Al2O3
O3
Sizes of
reinforcing
particles,
μm
3—.15
5—20
D16 20 % SiC 3—5
AL25 18 % SiC 5—15
≤ 0.1
≤ 0.1
AD0 7 % Al2O3
D16 20 % SiC
Distance
between
reinforcing
particles, μm
3—20
5—60
1—5
3—50
0.1—2.5
0.1—2.5
Tensile
strength σt,
MPa
340
267
512
278
148
574
© A.G. POKLYATSKY, A.Ya. ISHCHENKO and V.E. FEDORCHUK, 2011
2
capabilities of such advanced materials in fabrication
of efficient welded structures depends to a considerable
degree upon the quality of their joining.
The purpose of this study was to evaluate the efficiency
of application of friction stir welding (FSW)
for production of sound joints on composite, granulated
and quasicrystalline aluminium-base alloys.
Investigations were conducted by using some composite
materials based on aluminium alloys with dispersed
reinforcing ceramic particles of aluminium oxide
Al2O3 or silicon carbide SiC (Table 1). These
structural materials hold much promise owing to their
high values of elasticity modulus, wear and corrosion
resistance, and low values of specific weight and thermal
expansion and friction coefficients [1, 2].
Structure of a composite material consists of matrix
grains of an aluminium alloy, intermetallic inclusions
and particles of a reinforcing phase, which are more
or less uniformly distributed in the bulk of the matrix
(Figure 1).
Fusion welding of composite materials causes complete
melting of some of their volume in the zone of
formation of a permanent joint under the effect of a
high-temperature heat source, solidification of this
volume resulting in formation of the weld. Reinforcing
particles that remain non-melted are very non-uniformly
distributed in the solidifying weld metal (Figure
2, a). Moreover, if in welding of composite materials
reinforced with silicon carbide particles the
temperature of metal heating exceeds 660 °C, their
interaction with aluminium may result in formation
of acicular inclusions of aluminium carbide Al4C3
(Figure 2, b). This leads to substantial deterioration
of properties of the weld metal and, hence, of the
welded joints.
Characteristics of composite materials are greatly
affected by fractional composition and uniformity of
distribution of reinforcing particles in the matrix, in
addition to mechanical properties of a filling compound
and matrix alloy, proportion of the volume
contents of components, structure of composite castings
and character of heat or thermomechanical treatment.
Sizes of the particles determine both their in7/2011
Стр.2