The Paton Welding Journal 2002 #10

Makhnenko V.I., Velikoivanenko E.A., Rozynka G.F., Pivtorak N.I., Seyffarth P. and Jasnau U.
Mathematical modelling of heat processes in welding foam materials.
Algorithm of numerical estimation of temperature fields in a welded joint (penetration zone) in butt welding of elements with a foam macrostructure is suggested. This algorithm is based on corresponding modelling of the foam macrostructure using statistical data on pore parameters. It is shown that welding conditions at a high porosity should substantially differ from those for a solid material.
Lobanov L.M., Pivtorak V.A., Savitsky V.V. and Olejnik E.M.
Automatic computer analysis of holographic interferograms in non-destructive quality control of materials and elements of structures.
A system of computer analysis of holographic interferograms, based on numbering of holographic image of the object examined and use of a method of carrier fringes is presented. Effective method of their producing and a simple algorithm of processing interferograms are suggested. The method of carrier fringes makes it possible to solve the problem of indeterminacy of sign, which is usually available in interference fringe patterns. Examples of application of the developed method for control of defectness of elements of the honey-comb structure and flat samples are given.
Maksimova S.V., Khorunov V.F., Shonin V.A., Zvolinsky I.V., Voronov V.V. and Kostin V.A.
Vacuum brazing of dispersion-strengthened copper alloy Glidcop Al-25.
The effect exerted by a composition of brazing filler metals on structure, chemical heterogeneity and mechanical strength of brazed joints in dispersion-strengthened alloy Glidcop Al-25 was investigated. It is shown that along with the composition of a brazing filler metal, the significant role is also played by a pre-brazing heat treatment. Strength of the brazed joints was found to be 380-400 MPa in the case of using a heat-treated base metal and the optimised composition of a brazing filler metal.
Pokhmursky V.I., Student M.M., Sidorak I.I., Ryabtsev I.A. and Kuskov Yu.M.
Phase composition of Fe-C-Cr-Al system coatings produced by the method of electric arc metallizing.
Phase composition and processes of structure formation in coatings produced by the method of electric arc metallizing have been investigated. It was established that structure of coatings of Fe-C-Cr-Al system consists of martensite, troostite and residual austenite with a different content of alloying elements. With increase in aluminium content by more than 2 % in the flux-cored wire charge the adhesion strength of coating with a base metal is increased, and an alloyed ferrite is simultaneously appeared in the coating structure.
Kuzmenko V.G., Tokarev V.S., Galinich V.I., Sokolsky V.E. and Kazimirov V.P.
Selection of the composition of welding fluxes, allowing for the structural characteristics of their melts.
Investigation of the structure of slag melts and development of the concept of their structural bacisity formed the basis for suggesting the principle of preparing flux compositions with the basicity, varying under the impact of the thermal cycle of welding.
Akopiants K.S., Nazarenko O.K., Gumovsky V.V. and Chernyakin V.P.
System of diagnostics of electron beam in installations for electron beam welding.
System provides longitudinal image of beam with a distribution of a power density. A focus position with +-1 mm accuracy, minimum radius, maximum density of current, angle of convergence are determined. Conclusion is given about the gun cathode serviceability. Using this system the current of a magnetic deflecting lens with +-0.5-0.7 % accuracy, required for beam focusing at a required distance to the workpiece, is determined.
Bajic D.R., Melnichuk G.M., Lupan A.F. and Savitsky M.M.
Procedure and parameters of A-TIG welding of structural steels.
Relationship between parameters of tungsten-electrode argon-arc welding using activators (A-TIG welding) and weld parameters, electrode life and stability of the process of formation of a welded joint in welding structural steels is considered.
Shelyagin V.D., Khaskin V.Yu., Garashchuk V.P., Siora A.V., Bernatsky A.V. and Sakharnov A.V.
Hybrid CO2-laser and CO2 consumable-arc welding.
Technological research on laser and consumable-arc hybrid welding at process speeds of 15-300 m/h is described. Application of the hybrid process at fixed power of laser radiation is rational up to a certain thickness of welded metal, above which the penetration depth does not increase, despite lowering of welding speed.
Postolaty N.I., Glushchenko A.D., Dukh S.V. and Gritsenko L.S.
On welding properties of thyristor rectifiers.
Features of forming the external static and external dynamic characteristics of thyristorised welding rectifiers are considered and the ability to improve drop transfer in CO2 welding is shown.
Shapoval A.N.
Development of composite materials for zirconium-based active elements of plasmatron electrodes.
An electrode and its manufacturing method are proposed, which envisage formation of a tight contact of the electrode case with the active insert during their joining. A composite material has been developed for the active insert of plasmatron electrode with a barrier layer of zirconium nitride.
Bely A.I., Zhudra A.P. and Dzykovich V.I.
Peculiarities of deoxidation of the weld pool metal in plasma surfacing with composite materials.
Experiments on deoxidation of matrix of granular tungsten carbide based composite alloys in plasma surfacing, transfer of aluminium to the deposited metal and its effect on arrangement of reinforcing particles (WC-W2C) in the wear-resistant layer are described.
Kalianov V.N.
Surfacing with nitrogen alloys.
Examples of effective alloying of deposited metal with nitrogen are considered. It is shown experimentally that nitrogen assimilation by deposited metal in arc welding (surfacing) at straight polarity current is higher than that at reverse polarity.

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