The Paton Welding Journal №8 2012 (880,00 руб.)

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International Scientific-Technical and Production Journal August 2012 # 8 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 . Growth of corrosion cracks in structural steel 10GN2MFA ..................................... 2 . and . Structure and properties of welded joints of steel S390 (S355 J2) ....................... 6 . Mathematical formulation of carbon equivalent as a criterion for evaluation of steel weldability ......................................... 11 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 . and . Development of forge-welded combined medium-pressure rotor for 325 MW steam turbine ..................................................................................... 36 . and . Technology of projection welding of parts of large thicknesses with T-shaped joints ................................................ 42 State Registration Certificate KV 4790 of 09.01.2001 $324, 12 issues per year, 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», 2012 . and . Portable apparatus for consumable-nozzle electroslag welding ............................................... 45 . and . Spatial distribution of magnetic field and its minimization in resistance spot welding ....................................................................................... 47 NEWS 11th International Conference-Exhibition on Problems of Corrosion and Anticorrosive Protection of Structural Materials «Corrosion-2012» ................................................................................ 52 International Scientific-and-Technical Conference «Surface Engineering and Renovation of Parts» ................................................. 54 . and . Influence of deposited metal composition on structure and mechanical properties of reconditioned railway wheels ................................................................................................ 16 . and . New system of filler metals for brazing of titanium alloys ............................................................... 22 INDUSTRIAL Interview with V.G. Subbotin, Director General of OJSC TURBOATOM ...................................................................................... 26 . Combined fusion welding technologies (Review) ............................................................................................. 29 Pub l 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 isher: Inte r n a t iona l A ssocia t ion «W e l ding» M Editorial b o ard: a khne Berdnikova E.N., Shekera V.M nko V .I., M Poznya a rka s hova Ko International editorial c ounc il: kov V.D stin ., Z V. A Ga h da L.I., M a bche Z khne u nov S.L nko O.V Maksimenko A.A nko A.S ., jvorons Berdnikova Shishkevich A.S h k . E K y A.A., Poznya a N., K l kov V.D pa t yuk A.V., Aleks ., Ma rka Voron orunov V .F Lashchenko G.I r a Promotion group: Va Ts vilov A.V., K a S.V yuk A.K ., Mora a ntor A.G vets Translators:or: Elec Edi t K tron galley: EInte . P a o tonnal A E l 11, Bozhenko str., 0 .O rnati e x:T a l. (: 3 ( 8044) E-mai ssoc i U Address: 368 ati 0 ectric Weld 200 82 77 .ru , in F l: journal@paton.ki 38044) o Kyiv, U g In n «We stitu t 200 81 45 RL: www.ru e con t Subscriptions: ldi k ngraine », e, v.ua u chuk-Y t s e Chernobaj u Y s eenko T.A hova L.I., o v V.V ky S.I., Skuls nko V Grinche .S., Na h V. s al Dak chenko K . A Le n ky V.Y ko E u ., Gris .D hin N.N., A., Lychko I.I., K ya kone vche nko O.G., Le Oga n is chny A.A., Ga o n E . S vchuk V .K vris h V .S zulin S.M., Foma kin A.A., Goncha rova O.N

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GROWTH OF CORROSION CRACKS IN STRUCTURAL STEEL 10GN2MFA V.I. MAKHNENKO1, L.I. MARKASHOVA1, O.V. MAKHNENKO1, E.N. BERDNIKOVA1, V.M. SHEKERA1 and A.S. ZUBCHENKO2 1E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine 2«Hydropress», Podolsk, Russia Relationship between corrosion crack growth rate and stress intensity factor, based on the static corrosion crack resistance diagram, is described. The main working hypothesis on the discrete nature of crack growth in structural steel is confirmed. Keywords: welded structures, NPP steam generator, static corrosion crack resistance diagram, structural steel, corrosion cracks, electron microscopy, stress intensity factor, hydrogen embrittlement Corrosion cracks are among the most dangerous defects formed in modern durable steel structures. In a number of cases the process of initiation and formation of such defects is hard to determine. Therefore, duration of this process of formation of corrosion cracks may substantially change with time, depending on rather small changes in specific factors. Under these conditions, of high importance is to timely detect the formed corrosion crack and determine the kinetics of its growth with time during operation of a corresponding structure. Very often the latter is crucial and requires accumulation and generalisation of the corresponding experimental data. So, the present study is dedicated particularly to this issue. Welded joint 111 (Figure 1) in steam generators PG-1000 of modern power units of watermoderated water cooled reactor WWER-1000 considered in this study involves a problem in this respect, as each of units of this NPP comprises four steam generators. 13 such units at 4 NPPs with a service life of 8 to 28 years are in operation now in Ukraine. The first defects in welded joints 111 were detected in Ukraine in 2003 at the South-Ukrainian NPP. Before that, such cracks in joints 111 were detected at the Novovoronezhskaya and Kalininskaya NPPs in Russia, whish had been in operation for about 20 years. The first detected cracks were mainly longitudinal, i.e. located along the weld, and of rather big sizes both on the circumference and in depth [1], which caused difficulties in detecting them by the non-destructive test methods. The special ultrasonic testing procedure was developed for these purposes [2], which allowed revealing such defects at the early stages of their formation. As the procedure for repair of these defects detected at the early stage of their formation is time-consuming and requires shutdown of the entire unit, the necessity arose for predictive estimates of safe service life of a steam generator with detected crack-like defects in welded joints 111 between both hot (joint 111-1) and cold (joint 111-2) collector and branch pipes of the steam generator casing (see Figure 1). These predictions are based on the knowledge Figure 1. Schematic of the assembly of joining collector to steam generator casing by using branch pipe: 1 – steam generator casing; 2 – collector; 3 – branch pipe; 4 – main circulation piping; 5 – pocket 2 of the static corrosion crack resistance diagram (SCCRD) (Figure 2). Such diagrams are developed for specific materials (steels) and aggressive © V.I. MAKHNENKO, L.I. MARKASHOVA, O.V. MAKHNENKO, E.N. BERDNIKOVA, V.M. SHEKERA and A.S. ZUBCHENKO, 2012 8/2012

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