International Scientific-Technical and Production Journal
July
2012
#7
English translation of the monthly «Avtomaticheskaya Svarka» (Automatic Welding) journal published in Russian since 1948
Founders: E.O. Paton Electric Welding Institute of the NAS of Ukraine
International Association «Welding»
Editor-in-Chief B.E.Paton
Publisher: International Association «Welding»
CONTENTS
Editorial board:
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
SCIENTIFIC AND TECHNICAL
Makhnenko V.I., Velikoivanenko E.A., Milenin A.S.,
Rozynka G.F. and Pivtorak N.I. Inter-influence of defects in
welded joint zone at different force loading .................................... 2
Pereplyotchikov E.F. Application of powders of cobalt and
nickel alloys for plasma surfacing of exhaust valves of
internal combustion engines .......................................................... 5
International editorial council:
N.P.Alyoshin
U.Diltey
Guan Qiao
D. von Hofe
V.I.Lysak
N.I.Nikiforov
B.E.Paton
Ya. <...> Copies of individual articles may be obtained
from the Publisher.
© PWI, International Association «Welding», 2012
Session of Scientific Council on New Materials at
Committee on Natural Sciences of International
Association of Academies of Sciences .......................................... 42
Developed at PWI ........................................................................ 45
INTER-INFLUENCE OF DEFECTS IN WELDED JOINT
ZONE AT DIFFERENT FORCE LOADING
V.I. MAKHNENKO, E.A. VELIKOIVANENKO, A.S. MILENIN, G.F. ROZYNKA and N.I. PIVTORAK
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
It is noted that force interaction of group discontinuity defects of material in welded structures is not necessarily reduced
to the concept, according to which the adjacent defect impairs the service load resistance or does not affect it at a
sufficiently large distance between them. <...> K e y w o r d s : welded joints, group defect interaction, parallel defects, collinear defects, fracture probability
Extent of damage of a particular structure under specific service conditions is usually determined by the
number of found inadmissible defects. <...> The
existing rules of allowing for inter-influence of defects
[1—3, etc.] are usually reduced to combining by the
respective rules two or more admissible defects located
closest <...>
The_Paton_Welding_Journal_№7_2012.pdf
International Scientific-Technical and Production Journal
July
2012
# 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
. Inter-influence of defects in
welded joint zone at different force loading .................................... 2
. Application of powders of cobalt and
nickel alloys for plasma surfacing of exhaust valves of
internal combustion engines .......................................................... 5
. 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
. Structure and wear
resistance of chrome-manganese deposited metal ....................... 10
. and
. Peculiarities of
structure and mechanical heterogeneity in EB-welded
joints of 1201-T alloy .................................................................... 15
. and
. Improvement
of fatigue resistance of welded joints with accumulated
damage under multistage and block loading ................................. 19
. Effect of heat treatment on sensitivity of the
HAZ metal on titanium-stabilised austenitic steel to local
fracture ....................................................................................... 23
INDUSTRIAL
. and
. Automated system for diagnostics and repair
of reactor containment shell at Bilibinskaya NPP ........................... 28
. Evaluation of quality of technological
State Registration Certificate
KV 4790 of 09.01.2001
$324, 12 issues per year,
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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», 2012
processes of surfacing of parts of railway rolling stock .................. 32
. and
. Three-phase inverter power
source with direct conversion and increased power factor ............. 35
. and
. Influence of
violations of welding gun axial symmetry on focal spot
position ....................................................................................... 38
NEWS
Session of Scientific Council on New Materials at
Committee on Natural Sciences of International
Association of Academies of Sciences .......................................... 42
Developed at PWI ........................................................................ 45
Founders:
E. r
Inte
O
.
Pa iona
a
n
ton Ele
t
ctr
l A
ssocia
t
ic W
e
lding Institute
l
ion «W
e
of the
ding»
NA
S of Ukr
a
ine
Makhnenko V.I., Velikoivanenko E.A., Milenin A.S.,
Rozynka G.F
Pub
l
isher:
Pivtorak N.I
Editorial b
o
ard:
Pereplyotchikov E.F
Malinov V.L
International editorial c
ounc
il:
Skalsky V.R., Botvina L.R
Malinov L.S
Inte
r
n
a
t
iona
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ssocia
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ion «W
e
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ding»
Lyasota I.N
Kuzmenko A.Z
Knysh V.V., Solovej S.A
ev Yu.V
Pol
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Artemchuk V.V
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Na
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Matvejchuk V.A
Стр.1
INTER-INFLUENCE OF DEFECTS IN WELDED JOINT
ZONE AT DIFFERENT FORCE LOADING
V.I. MAKHNENKO, E.A. VELIKOIVANENKO, A.S. MILENIN, G.F. ROZYNKA and N.I. PIVTORAK
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
It is noted that force interaction of group discontinuity defects of material in welded structures is not necessarily reduced
to the concept, according to which the adjacent defect impairs the service load resistance or does not affect it at a
sufficiently large distance between them. A variant is considered, when interaction of group defects of the type of cracks
or wall thinning defects, improves the resistance to service loading.
Keywords: welded joints, group defect interaction, parallel
defects, collinear defects, fracture probability
Extent of damage of a particular structure under specific
service conditions is usually determined by the
number of found inadmissible defects. It is natural
that the greater the number of such defects, the more
damaged the examined structure is believed to be. The
existing rules of allowing for inter-influence of defects
[1—3, etc.] are usually reduced to combining by the
respective rules two or more admissible defects located
closest to each other into one independent admissible
(inadmissible) defect based on a concept, according
to which the neighbouring defect impairs or does not
influence the service load resistance of this defect.
Such a concept is quite simple, but on the whole
it is too conservative in a number of cases, as it does
not allow for the possibility of a third alternative,
namely that the neighbouring defect can unload this
defect, and thus, improve its performance under specific
service conditions.
Allowing for the third alternative at engineering
diagnostics of structures requires application of the
appropriate calculation procedures, normative documents,
etc. but, nonetheless, considering the modern
tendencies in development of computer engineering,
methods of mathematical modeling, information systems,
as well as growing requirements to optimization
of the developed critical structures, the good prospects
for application of these developments are undoubtful,
particularly for prediction of safe operation of welded
structures with long service life by the results of the
respective engineering diagnostics of their state.
This paper deals with such a possibility for sufficiently
characteristic in-service defects of welded
structures in the form of cracks and thinning.
Let us start with the simplest examples of interaction
of two and three through-thickness parallel
cracks of the same dimensions in an unlimited plate,
uniformly tensioned along a normal to crack plane
(Figures 1 and 2) by stress σ. The characteristic of
such defect loading is the stress intensity factor in
crack tip KI. Respective data from [4] for the case of
two cracks are given in Figure 1 and in Table 1, and
those for three cracks – in Figure 2, depending on
distance between cracks d. These data show that d
decrease noticeably lowers KI values, both for two
and for three cracks.
Table 1. Numerical results [4]
2а/d
0
0.2
0.4
0.6
0.8
1.0
1.25
2
5
10
100
*Plate with central crack.
Figure 1. Dependence FI = KI/(σ√πa) on d/2a [4]
⎯⎯⎯
© V.I. MAKHNENKO, E.A. VELIKOIVANENKO, A.S. MILENIN, G.F. ROZYNKA and N.I. PIVTORAK, 2012
2
7/2012
FI
1.0000*
0.9855*
0.9508*
0.9089*
0.8727*
0.8319
0.8037
0.7569
0.6962
0.6651
0.5846
Стр.2