Contents of the Paton Welding Journal
no.7, 2009 |
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Page |
Paton B.E. 25 YEARS OF WELDING IN OPEN SPACE | 2 |
| SCIENTIFIC AND TECHNICAL |
Kuchuk-YAtsenko S.I., Zyakhor I.V., Velikoivanenko E.A. and Rozynka G.F. Calculation of thermal-deformation conditions of formation of friction welded joints on heat-resistant alloy EI698VD | 7 |
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Thermal-deformation conditions of formation of friction welded joints on heat-resistant nickel alloy EI698VD were estimated. The possibility of reaching the melting point of the heat-resistant alloy within the contact zone at a stage of heating was proved, and behaviour of the melt at all stages of the process was studied. Methods for optimisation of the technology of friction welding of heat-resistant nickel alloys, and methods for minimisation of width of the phase transformation zone in welded joints were suggested. |
Skulsky V.Yu. Peculiarities of kinetics of delayed fracture of welded joints of hardening steels | 12 |
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The factors determining the rate of delayed fracture propagation at hydrogen embrittlement of welded joints of martensite steel at temperatures higher and lower than the revealed minimum of crack resistance (80-100 °C) and joints of bainite steel are considered. In addition to the known concepts it is shown that kinetics of delayed fracture can be determined by the character of distribution in the volume of metal of microplastic deformations, the propagation of which depends on the thermally-activated microstructural changes and rate of formation of local critical density of dislocations and hydrogen. In a general case the dependence of fracture duration on temperature is described using C-like curves. |
Markashova L.I., Grigorenko G.M., Pozdyakov V.D., Berdnikova E.N. and Alekseenko T.A. Influence of thermal cycles of welding and external loading on structural-phase variations and properties of joints of 17Kh2M steel | 18 |
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Structural-phase transformations in samples of high-strength low-alloy steel 17Kh2M were studied at different cooling rates simulating different processes of their welding and subsequent deformation at increment of external load. Analytical evaluation of the specific contribution of structures formed in the welding zone to mechanical property values, as well as magnitude and distribution of strains, residual inner stresses and their gradients localized along the boundaries of structural-phase components was performed. |
Razmyshlyaev A.D.and Mironova M.V. Calculation of parameters of longitudinal magnetic field providing removal of drop from electrode tip in arc surfacing | 26 |
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Mathematical model of the process of removal of a drop from electrode tip in arc surfacing using the longitudinal magnetic field was developed. It is shown that a field pulse of the appropriate duration is required to remove the drop from the electrode tip at a certain value of the radial component of induction in the drop zone. |
| INDUSTRIAL |
Paton B.E., Shelyagin V.D., Akhonin S.V., Topolsky V.F., Khaskin V.Yu., Petrichenko I.K., Bernatsky A.V., Mishchenko R.N. and Siora A.V. Laser welding of titanium alloys | 30 |
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The article describes the optimal scheme of gas shielding chosen for laser welding, which was used to produce joints on alloys VT1-0, VT6, SP15, VT22, VT23 and T110. The feasibility of laser welding of low- and medium alloys was proved. It is shown that the technology of laser welding of high titanium alloys requires further improvement. |
Uratani Yo., Takano G., Nayama M. and Shimokusu Yo. Application of electron beam welding in the nuclear industry (Review) | 35 |
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Nuclear power generation in the energy supply is becoming increasingly important from the viewpoint of future energy resources and preventing of global warming. The assurance of safety in the nuclear power plant is an absolutely essential condition. In the fabrication of related nuclear power plant equipments, improvements have been conducted in order to raise the reliability. One of the most suitable joining techniques is the electron beam welding. This review describes the recent application of the electron beam welding for PWR nuclear power plant. |
Yushchenko K.A., Bulat A.V., Levchenko O.G., Bezushko O.N., Samojlenko V.I., Dovgal D.I. and Kakhovsky N.Yu. Effect of composition of base metal and electrode covering on hygienic properties of welding fumes | 44 |
Golovko V.V. and Goncharov I.A. Method for evaluation of fracture resistance of welding flux granules | 49 |
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Method for evaluation of fracture resistance of flux granules and device for its implementation are described. It is shown that the suggested test procedure can be used to generate data on fracture resistance of the flux granules, which is one of the most important welding-operational characteristics of fluxes. |
| BRIEF INFORMATION |
Lazorenko Ya.P., Kolyada V.O., Shapovalov E.V., Lutsenko N.F. and Skuba T.G. Effectiveness of application of algorithms for identification of weld reinforcement in digital images | 51 |
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The paper deals with two algorithms for identification of weld reinforcement in digital images obtained with an optical triangulation sensor Å neuronet and probabilistic. Effectiveness of their application is confirmed experimentally. |
