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View/Download PDF of This Issue, the File Size International Scientific-Technical and Production Journal April 2008 # 4 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 Publisher: International Association «Welding» International Association «Welding» Editor-in-Chief B.E.Paton CONTENTS Editorial board: Yu.S.Borisov V.F.Grabin A.Ya.Ishchenko V.F.Khorunov SCIENTIFIC AND TECHNICAL B.V.Khitrovskaya I.V.Krivtsun S.I.Kuchuk-Yatsenko Knysh V.V., Valteris I.I., Kuzmenko A.Z. and Solovej S.A. Yu.N.Lankin V.K.Lebedev V.N.Lipodaev L.M.Lobanov Corrosion fatigue resistance of welded joints strengthened V.I.Makhnenko A.A.Mazur by high-frequency mechanical peening .......................................... 2 O.K.Nazarenko I.K.Pokhodnya I.A.Ryabtsev Yu.A.Sterenbogen N.M.Voropai K.A.Yushchenko Pekarska V. Numerical simulation of metal structure in A.T.Zelnichenko HAZ in welding of increased strength steel .................................... 5 Borisov Yu.S., Borisova A.L., Tunik A.Yu., Karpets M.V., International editorial council: Vojnarovich S.G., Kislitsa A.N. and Kuzmich-Yanchuk E.K. N.P.Alyoshin (Russia) U.Diltey (Germany) Effect of microplasma spraying parameters on structure, Guan Qiao (China) D. von Hofe (Germany) phase composition and texture of hydroxyapatite coatings ............ 10 V.I.Lysak (Russia) N.I.Nikiforov (Russia) Milenin A.S. Physical and technological aspects of B.E.Paton (Ukraine) Ya.Pilarczyk (Poland) braze-welding of titanium-aluminium joints (Review) ...................... 16 P.Seyffarth (Germany) G.A.Turichin (Russia) Silchenko T.Sh., Kuzmin S.V., Lysak V.I., Gorobtsov A.S. Zhang Yanmin (China) A.S.Zubchenko (Russia) and Dolgy Yu.G. Estimation of vertical displacement of flyer metal plates before contact point in explosion Promotion group: V.N.Lipodaev, V.I.Lokteva welding ........................................................................................ 20 A.T.Zelnichenko (exec. director) Translators: I.N.Kutianova, V.F.Orets, T.K.Vasilenko, N.V.Yalanskaya INDUSTRIAL Editor N.A.Dmitrieva Makhnenko V.I., Zhudra A.P., Velikoivanenko E.A., Bely A.I. Electron galley: I.S.Dmitruk, T.Yu.Snegiryova and Dzykovich V.I. Prediction of the size of granules and efficiency of their production in centrifugal spraying of Address: alloys ........................................................................................... 24 E.O. Paton Electric Welding Institute, International Association «Welding», Yavorsky Yu.D., Kuchuk-Yatsenko S.I. and Losev L.N. 11, Bozhenko str., 03680, Kyiv, Ukraine Tel.: (38044) 287 67 57 Experimental estimation of carrying capacity of butt Fax: (38044) 528 04 86 welded joints of structural shapes in elements of E-mail: [email protected] http://www.nas.gov.ua/pwj structures subjected to low-cycle load .......................................... 32 State Registration Certificate KV 4790 of 09.01.2001 Kononenko V.Ya. Hyperbaric dry underwater welding (Review) ...................................................................................... 36 Subscriptions: $324, 12 issues per year, postage and packaging included. BRIEF INFORMATION Back issues available. Kolyada V.A. and Shapovalov E.V. Calibration of an optical All rights reserved. system for evaluation of temperature field distribution in This publication and each of the articles contained herein are protected by copyright. the welding zone .......................................................................... 41 Permission to reproduce material contained in this journal must be obtained in writing from the Publisher. News ........................................................................................... 44 Copies of individual articles may be obtained from the Publisher. Developed at PWI ....................................................... 15, 23, 46, 47 © PWI, International Association «Welding», 2008 CORROSION FATIGUE RESISTANCE OF WELDED JOINTS STRENGTHENED BY HIGH-FREQUENCY MECHANICAL PEENING V.V. KNYSH, I.I. VALTERIS, A.Z. KUZMENKO and S.A. SOLOVEJ E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine The paper gives the results of investigation of the influence of corrosive environment on lowering of fatigue resistance of tee welded joints on 10KhSND steel unstrengthened and strengthened by high-frequency mechanical peening (HFMP). The high effectiveness of application of HFMP technology as a method of surface plastic deformation of metal near the areas of fatigue damage localization to improve corrosion fatigue was established experimentally. Application of HFMP technology improves the cyclic fatigue life of tee welded joints in a corrosive environment 3.5 times and endurance limit by 80 %. Keywords: arc welding, metal structures, welded joints, simultaneous lowering of cyclic fatigue life of the corrosive environment, cyclic load, high-frequency mechanical peening, fatigue life improvement structure, having internal defects, which were over- looked during inspection. In [5] at fatigue testing of Corrosion is the most widely spread type of welded joint tee welded joints in sea water it is shown that at shot damage in such metal structures as bridges, off-shore blasting surface strengthening the corrosion-fatigue platforms, ship hulls, etc. [1, 2]. On the other hand, life of the joint is increased 2--3 times in the stress these structures are operating under the conditions of raiser zones. Fatigue cracks in the samples both in the the impact of alternating loads, so that corrosion fatigue initial condition, and after strengthening initiated in is the main mechanism of their damage in service. Si- the zone of the deposited metal transition to the base multaneous influence under the alternating loading con- metal. Values of improvements of corrosion-fatigue ditions of such damaging factors as corrosive environ- life of the joints established in [5], point to the high ment, high levels of stress concentration and tensile effectiveness of application of the methods of surface residual welding stresses in the joint local zones [1] leads plastic deformation of the joint metal near the sites to the corrosion-fatigue damage mechanism being the of fatigue damage localization for improvement of the most hazardous and essentially increasing the fracture metal structure service life. rate of welded structure elements. During the recent years, the technology of high-fre- To ensure the required fatigue life of the joints quency mechanical peening (HFMP) of the welded joint operating under the corrosion fatigue conditions, ad- metal in the stress raiser zones, using the energy of ditional postweld heat treatments [3--5] are usually ultrasound, has become widely applied for improvement applied, which are aimed at redistribution of the ten- of cyclic fatigue life of welded elements [6--8]. It is sile residual stresses, lowering of the stress concen- anticipated that the ultrasonic HFMP technology will tration factor, inducing favourable residual compres- turn out to be the most effective for improvement of sive stresses, elimination of surface microcracks in the welded joint corrosion fatigue resistance, compared to weld zones. other known methods of surface plastic deformation of However, the experimental data given in [3, 4] do the metal (explosion treatment, pneumatic peening, not provide an unambiguous answer about the effec- roller treatment, shot peening, etc.). This assumption tiveness of the proposed treatments. In [3] it is ex- is based on the fact that application of ultrasonic HFMP perimentally established that metal strengthening by technology for strengthening the zone of fillet weld tran- explosion in the geometrical stress raiser locations has sition to base metal in tee joints on St.3sp (killed) steel only a minor influence on the cyclic fatigue life of to the depth down to 10--20 mm results in formation of welded samples in sea water. On the other hand, the grains elongated in one direction in the treatment zone, authors of [3] using fatigue testing in air, which con- their lateral dimension being 100 nm and less. Electron firms the high effectiveness of explosion treatment diffraction accentuates the crystalline nature of the and coefficient of lowering of cyclic fatigue life in sea structure [9]. Therefore, a metal nanostructure forms at water 1.6--1.8 times, present this treatment as a quite down to 20 mm depth in the zone of peening by ultrasonic promising technology of improvement of the operating HFMP technology, which may have an essential influ- reliability of hydraulic engineering facilities. In [4] ence on improvement of the corrosion fatigue resistance low-frequency vibration treatment is used to lower of strengthened joints. the residual stresses in order to improve the corrosion In this work the influence of the corrosive envi- fatigue resistance of welded structures. The major ronment on lowering of fatigue resistance of welded drawback of this technology is also indicated as a joints with fillet welds strengthened and un- © V.V. KNYSH, I.I. VALTERIS, A.Z. KUZMENKO and S.A. SOLOVEJ, 2008 strengthened by HFMP technology was studied. 2 4/2008 Figure 1. Schematic of a sample of tee joint on 10KhSND steel Figure 2. Sample of a tee welded joint on 10KhSND steel during The influence of the corrosive environment was testing in the corrosive environment evaluated on samples of tee joints of 10KhSND steel is shown in Figure 2. This set-up provided a constant (sy = 390 MPa, st = 530 MPa) (Figure 1). Prizmatic
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