Copies of individual articles may be obtained
from the Publisher.
© PWI, International Association «Welding», 2011
INDUSTRIAL
Labur T.M. Technological capabilities for improvement of
reliability of welded joints on aluminium-lithium alloys ................... 30
Kolomijtsev E.V. and Serenko A.N. Influence of surface
strengthening and argon-arc treatment on fatigue of
welded joints of structures of metallurgical production .................. 35
Shelyagin V.D., Lukashenko A.G., Lukashenko D.A.,
Bernatsky A.V., Garashchuk V.P. and Lutsenko V.I. Laser
welding of thin-sheet stainless steel ............................................. 38
Shevchenko N.V., Skachkov I.O. and Ponomarev V.E.
Method for estimation of welding properties of power
sources for arc welding ................................................................ 43
BRIEF INFORMATION
Stepakhno V.I., Kopylov L.N. and Zelenchenok G.S.
Upgrading of electric circuit of A-1150 machine for vertical
welding ........................................................................................ 46
INFLUENCE OF REPEATED LOADING
ON THE EFFICIENCY OF ELECTRODYNAMIC
TREATMENT OF ALUMINIUM ALLOY AMg6
AND ITS WELDED JOINTS
L.M. LOBANOV, N.A. PASHCHIN, V.P. LOGINOV and O.L. MIKHODUJ
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
The mechanism of reduction of preliminary stresses in repeated loading and electrodynamic treatment of AMg6 alloy
and its welded joints were investigated on the basis of the developed procedure. <...> It was established that the history of
loading of AMg6 alloy has no substantial effect on relaxation characteristics of metal subjected to repeated impact by
current pulses. <...> K e y w o r d s : aluminium alloy, welded joint, residual stress,
electric current pulse, electrodynamic treatment, efficiency of
treatment, relative yield strength, tensile strength
During service of welded structures of aluminiummagnesium alloys operating under conditions of influence of pulse electric and magnetic fields, the residual stresses causing fracture of single elements can
arise at certain conditions. <...> The beginning of plastic
flow of metal begins at values of working stresses
below the relative yield strength [1—3]. <...> One of the methods of electric current impact on
the metals is electrodynamic treatment (EDT) based
on initiating of electrodynamic forces in the material,
which are formed during passing of electric charge
through the current conducting material [5]. <...> While
summing them with outer loadings, applied to the
structure being treated, the local fields of plastic yielding <...>
The_Paton_Welding_Journal_№4_2011.pdf
International Scientific-Technical and Production Journal
April
2011
# 4
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.Kirian 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
. Influence of repeated loading on the efficiency of
electrodynamic treatment of aluminium alloy AMg6 and its
welded joints ................................................................................ 2
. and
. Effect of alloying of the welds on
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
structure and properties of welded joints on steel 17Kh2M ............ 5
. Application of nanostructured interlayers in
joints of difficult-to-weld aluminium-base materials
(Review) ...................................................................................... 14
. and
. and
. Formation of narrow-gap
welded joints on titanium using the controlling magnetic
field ............................................................................................. 19
. Deposition of titanium-based
graded coatings by laser cladding ................................................ 23
. Electric arc spraying of cermet and
metal-glass coatings .................................................................... 26
INDUSTRIAL
. Technological capabilities for improvement of
reliability of welded joints on aluminium-lithium alloys ................... 30
. and
. Influence of surface
strengthening and argon-arc treatment on fatigue of
welded joints of structures of metallurgical production .................. 35
State Registration Certificate
KV 4790 of 09.01.2001
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postage and packaging included.
Back issues available.
All rights reserved.
This publication and each of the articles
contained herein are protected by copyright.
Permission to reproduce material contained in
this journal must be obtained in writing from
the Publisher.
Copies of individual articles may be obtained
from the Publisher.
© PWI, International Association «Welding», 2011
BRIEF INFORMATION
. and
.
Upgrading of electric circuit of A-1150 machine for vertical
welding ........................................................................................ 46
. and
. Laser
welding of thin-sheet stainless steel ............................................. 38
. and
.
Method for estimation of welding properties of power
sources for arc welding ................................................................ 43
Pub
l
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isher:
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t
iona
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ion «W
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ding»
Mikhoduj
Lobanov L.M., Pashchin N.A., Loginov V.P
O.L
Editorial b
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ard:
Markashova L.I., Poznyakov V.D., Alekseenko T.A.,
Berdnikova E.N., Zhdanov S.L., Kushnaryova O.S
Maksimenko A.A
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ounc
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Kolomijtsev E.V
Shelyagin V.D., Lukashenko
sky A.V., Ga
Serenko A.N
ra
Berna
t
Shevchenko N.V., Skachkov I.O
shchuk V.P
Subscriptions:
A.G., Lukashenko D.A.,
Lutsenko V.I
Ponomarev V.E
Zelenchenok G.S
Stepakhno V.I., Kopylov L.N
Стр.1
INFLUENCE OF REPEATED LOADING
ON THE EFFICIENCY OF ELECTRODYNAMIC
TREATMENT OF ALUMINIUM ALLOY AMg6
AND ITS WELDED JOINTS
L.M. LOBANOV, N.A. PASHCHIN, V.P. LOGINOV and O.L. MIKHODUJ
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
The mechanism of reduction of preliminary stresses in repeated loading and electrodynamic treatment of AMg6 alloy
and its welded joints were investigated on the basis of the developed procedure. It was established that the history of
loading of AMg6 alloy has no substantial effect on relaxation characteristics of metal subjected to repeated impact by
current pulses.
Keywords: aluminium alloy, welded joint, residual stress,
electric current pulse, electrodynamic treatment, efficiency of
treatment, relative yield strength, tensile strength
During service of welded structures of aluminiummagnesium
alloys operating under conditions of influence
of pulse electric and magnetic fields, the residual
stresses causing fracture of single elements can
arise at certain conditions. The beginning of plastic
flow of metal begins at values of working stresses
below the relative yield strength [1—3].
Since the end of the last century a number of domestic
and foreign scientific organizations conduct research
works on optimization of structure and properties of
structural materials and welded joints using their treatment
by pulse electromagnetic fields. It was established
that pulse influence of current on metals and alloys
affects the fatigue resistance, static strength and other
mechanical characteristics [4]. At the same time the data
of work [3] evidence negative role of electromagnetic
effect on the strength of metals and alloys.
One of the methods of electric current impact on
the metals is electrodynamic treatment (EDT) based
on initiating of electrodynamic forces in the material,
which are formed during passing of electric charge
through the current conducting material [5]. While
summing them with outer loadings, applied to the
structure being treated, the local fields of plastic yielding
of metal arise in the zone of current impact [6].
During investigation of EDT influence on aluminium
alloys and low-carbon steels the main attention
was paid on studying mechanism of stress state
relaxation [7—9] and evolution of structure of base
metal and welded joint [10]. It should be noted that
questions about changing strength characteristics of
welded joints under the impact of energy of current
charges initiated by EDT practically were not studied.
At the same time in the works [3, 4] different opinions
about influence of pulse electromagnetic fields on the
strength of structural materials are given. Besides
© L.M. LOBANOV, N.A. PASHCHIN, V.P. LOGINOV and O.L. MIKHODUJ, 2011
2
there are no data in modern literature about the effect
of repeated loading on relaxation of stresses in metal
at electromagnetic effects.
The purpose of this work is investigation of influence
of EDT on mechanical properties of aluminium
alloy AMg6 and its welded joints at uniaxial tension
as well as on relaxation of stresses at repeated loading
of metal.
The EDT of specimens of base metal and welded
joints of annealed aluminium alloy AMg6 of 4 mm
thickness with a size of 110 Ч 30 mm working area
loaded by uniaxial tension at the speed of 0.1 mm/s
were carried out. Three levels of tensile loadings were
preset: at the low elastic stresses of 52—60 MPa; at
the stresses of 116—147 MPa close to elasticity limit
of AMg6 alloy (which approximately correlates with
the level of residual welding stresses in the alloy being
investigated); at the stresses beyond elasticity limit.
The tension in elastic-plastic zone was brought to 260—
280 MPa, i.e. till generating Portevin—Le Chatelier
effect which is manifested in the discontinuous yielding
of metal in the zone of prefracture [11].
EDT was performed using laboratory machine, the
description of which is given in the work [9]. EDT
of specimens after tension was performed using contact
of working electrode with a surface of a metal according
to the scheme presented in [7]. The specimens
were subjected to tension till generating stresses of
preset value in them and treated with a series of current
discharges, after each pulse the drop of tensile force
in the material was controlled. The EDT was conducted
at the energy of current discharge E = 140,
300 and 800 J.
After termination of EDT, the 50 % of investigated
specimens were subjected to fracture and remained
part was again subjected to tension and treatment
under similar conditions to determine influence of repeated
cycle of EDT on stress relaxation.
The changes of mechanical properties of AMg6
alloy and its welded joints at different levels of loading
4/2011
Стр.2