Contents of the Paton Welding Journal
no.10, 2009 |
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75th Anniversary of the E.O. Paton Electric Welding Institute | 2 |
SCIENTIFIC AND TECHNICAL |
Krivtsun I.V., Kharlamov M.Yu., Petrov S.V., Marinsky G.S., Korzhik V.N. and Chernets A.V. Numerical analysis of characteristics of the arc plasma in air-vapour plasmatrons with refractory cathode | 4 |
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The mathematical model is presented, describing a turbulent flow of the electric arc plasma in air-vapour plasmatrons with a refractory cathode. The effect of operating parameters of a plasmatron and kind of the employed plasma gas on electric and energy characteristics of the arc, as well as on thermal and gas-dynamic characteristics of the plasma flow generated by such a plasmatron, is numerically studied. |
Shuba I.V. Mechanical impact of gas flow on the surface of penetration channel walls in gas-laser cutting | 12 |
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The paper deals with the features of assist gas flow in gas-laser cutting of 10 mm steel plates. It is established that distribution of tangential stresses on the melt surface depends on the position of the gas jet axis relative to the entrance face of the penetration channel. The possibility of ensuring a uniform distribution of tangential stresses on the melt surface in a broad range of working gas excess pressure is shown. |
Lankin Yu.N., Sushy L.F. and Shulym V.F. Beam current control system in electron beam welding gun with directly heated cathode | 16 |
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The system for automatic control of beam current of electron beam welding gun with directly heated cathode is described. |
Ryabtsev I.A., Chernyak Ya.P., Ryabtsev I.I., Zhdanov V.A. and Bogajchuk I.L. Structure and wear resistance of deposited metal 20Kh5M2FS alloyed with sulphur and phosphorus | 19 |
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The effect of alloying with sulphur and phosphorus on structure and wear resistance of deposited metal 20Kh5M2FS was investigated. It was proved that phosphorus dissolves to harden the martensitic component of structure of the deposited metal, whereas sulphur forms sulphides and oxy-sulphides with other alloying elements. It is shown that the most favourable combination of wear resistance of friction pair components is provided by deposited metal 20Kh5M2FS alloyed with 0.21 wt.% S and 0.56 wt.% P. |
Ustinov A.I., Matvienko Ya.I., Polishchuk S.S. and ShishkinA.E. Investigation of phase transformations and plastic deformation at continuous heating of Al/Cu multilayer foil | 23 |
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Pressure welding through an interlayer with a multilayer structure based on intermetallic-forming elements allows solid-state formation of permanent joints in hard-to-weld materials. The role of interlayer structure in formation of permanent joints has been evaluated by an example of Al/Cu multilayer foil. It is shown that such foils subjected to continuous heating to 500 °C, under the conditions of permanent loads are characterized, in addition to phase transformations caused by the reaction diffusion of components, also by plastic deformation, the intensity of which depends upon the foil temperature. |
INDUSTRIAL |
Paton B.E., Shelyagin V.D., Akhonin S.V., Topolsky V.F. , Khaskin V.Yu., Petrichenko I.K., Bernatsky A.V., MishchenkoR.N. and Siora A.V. Laser welding of titanium alloys | 28 |
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The optimal scheme of gas shielding was chosen for laser welding, allowing production of joints on alloys VT1-0, VT6, SP15, VT22, VT23 and T110. The possibility of using laser welding for low and medium alloys was established. It is shown that further improvement of the laser welding technology is required for high titanium alloys. |
Belous V.Yu. TIG welding of thick titanium plates by using forming backing | 32 |
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The method of fit-up for narrow-gap TIG welding of 20Ä100 mm thick titanium plates was developed, providing a high quality of welded joints and substantial reduction of cost of the welding process. Fit-up of plates for welding is performed by using a forming backing, which acts as a mould when making the root pass. The use of backings makes it possible to simplify edge preparation and fit-up of the welded joints, and decrease welding deformations. |
Oryshchenko A.S., Osokin E.P., Pavlova V.I. and Zykov S.A. Bimetal steel-aluminium joints in shipbuilding hull structures | 35 |
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The results of works on development of welded steel-aluminium hull structures with application of a bimetal based on shipbuilding steel of D40 type and aluminium alloy of grade 1561 are given. Examples of new engineering solutions on technological design of steel-aluminium joints are shown. |
Degtyaryov V.A., Shulginov B.S. and Knysh V.V. Deformation criterion of the efficiency of strengthening of welded joints by high-frequency mechanical peening | 39 |
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The paper gives the results of fatigue testing of butt welded joints after high-frequency mechanical peening, allowing for different preparation technologies. It is shown that measuring the depth of the peened zone groove is one of the objective methods for assessment of the efficiency of treatment of the welded joints. |
BRIEF INFORMATION |
Makhnenko V.I. and Romanova I.Yu. Theoretical prediction of fatigue life of welded structures at bifrequency spectrum of cyclic loading | 42 |
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The method for theoretical prediction of service life of welded joints under bifrequency cyclic loading using PalmgrenÄMeier's hypothesis of linear summation of fatigue damage is considered. It is shown that this calculation procedure makes it possible to obtain appropriate estimates of service life of the joints requiring no additional experimental studies. |
News | 44 |
NEWS |
Novokramatorsk Machine-Building Works is 75 | 45 |
Opening of commemorative plaques | 46 |
International exhibition NEVA-2009 | 47 |
INFORMATION |
Technopark «The E.O. Paton Electric Welding Institute» today | 49 |
Domestic agglomerated fluxes for multi-arc welding | 50 |
