Contents of the Paton Welding Journal
no. 11, 2010 |
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SCIENTIFIC AND TECHNICAL |
Yushchenko K.A., Ustinov A.I., Zadery B.A., Savchenko V.S., Melnichenko T.V., Kurenkova V.V., Zvyagintseva A.V. and Gakh I.S. Effect of nanofoil of the Ni— NbC system on structure of electron beam welds in heat-resistant alloys | 2 |
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The effect of niobium carbide nanoparticles on structure and properties of electron beam welds in nickel alloys was studied. Alloying of the weld metal with niobium carbide nanoparticles was performed by adding composite nanostructured foil of the Ni— NbC system into the weld pool. The foil was produced by electron beam evaporation of the components in vacuum, followed by combined deposition of their vapour flows on the substrate. Adding the niobium carbide nanoparticles into the weld pool was shown to lead to formation of crystalline grains with a cellular structure within the weld zone, with the NbC particles located along the boundaries of the above grains. The effect of this structure of the welds on their mechanical properties was analysed. |
Zhdanov S.L., Poznyakov V.D., Maksimenko A.A., Dovzhenko V.A., Vasiliev V.G., Vysokolyan N.V. and Korobka V.A. Structure and properties of arc-welded joints on steel 10G2FB | 8 |
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Structural transformations in the HAZ metal of steel 10G2FB under the impact of the arc welding thermal cycles and their effects on the mechanical properties of this region of a welded joint were investigated. The range of permissible cooling rates of the HAZ metal at temperatures of 600— 500 °C, providing properties of the welded joints at a level of requirements to the base metal and their high resistance to delayed, brittle and laminated fractures, was identified. |
Khorunov V.F., Maksymova S.V., Butenko Yu.V. and Maly A.B. Strength of brazed joints on heat-resistant nickel alloy Inconel718 produced by using palladium brazing filler metals | 12 |
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Comparative investigations were carried out to study strength of high-temperature vacuum brazed joints on heat-resistant nickel alloy Inconel 718, made by using filler metals of the Pd— Ni— Cr— Si, Pd— Ni— Co— Cr— Si and Pd— Ni— Cr— B systems and experimental filler metal of the Pd— Ni— Cr— Ge system. The experimental filler metal was shown to have a high potential for ensuring specified short- and long-time strength of the brazed joints. |
Bondarev A.A. and Ternovoj E.G. Features of weld formation and properties of aluminium and magnesium alloy joints under simulated space conditions | 16 |
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Features of weld formation in welded joints of aluminium and magnesium alloys made by electron beam welding under the influence of varying gravity forces and low temperatures are given. Influence of the above factors and content of dissolved hydrogen in the base metal on joint strength, defect formation and loss of alloying elements from the weld metal is shown. |
Makhnenko O.V., Timoshenko A.N., Muzhichenko A.F. and Goncharov P.V. Improvement of the technology for arc spot welding of overlap joints based on the results of mathematical modelling | 21 |
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Mathematical modelling of the metal-arc spot welding process was carried out by the thermoplasticity method combined with the finite element method to estimate the possibility of improving the welding technology. Performance of a spot welded joint under static and alternating loads was evaluated based on the data on size of the fusion zone and level of residual stresses within the weld spot zone. |
Stepanov G.V., Babutsky A.I., Mameev I.A., Chizhik A.V., Savitsky V.V., Tkachuk G.I. and Pashchin N.A. Improvement of cyclic fatigue life of metallic materials and welded joints by treatment by pulsed electric current | 27 |
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The paper presents experimental data on improvement of cyclic fatigue life of stainless steel and aluminium alloy samples as a result of treatment based on direct passage of electric current through the material, as well as data of calculation-experimental studies of residual welding stress relaxation under the impact of induced electric current. Results of investigation of the influence of current treatment on residual stresses in the coating and in the material after grinding are given. |
INDUSTRIAL |
Lebedev V.A., Lendel I.V., Lendel V.I. and Pichak V.G. Trends in improvement of auxiliary equipment for welding production | 31 |
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Main trends in development of mechanized welding equipment for fabrication of structures made in and outside Ukraine are analyzed, and basic requirements to them are indicated. Versatile rotators comprising a new generation of drives with computer numerical control and commutatorless motors are considered. Specific features of their operation are pointed out, and their advantages are noted. Also, the article analyzes the methods for reinstalling roller supports in a driving roller device, and considers some methods for elimination of drift of a workpiece in welding or surfacing. |
Seyffarth P. and Gaede R. Image processing for automated robotic welding | 35 |
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The new developed by IMG and used by WADAN yards MTW image processing system for welding robots delivers a very fast automatically generated program. A laser line scanner with a scanning rate of 1 m/s and a fast working calculation unit gives a 3D picture in less than 3 min all over the 16 ø 4 m panel. The accuracy of the robotic positioning is Ñ0.5 mm after the shake hand process between the image processing system and the robot programming system. This new developed 3D geometrically recognising and robot programming system allows a very fast and flexible production system for micropanels without any link to the central computer aided yard system. This «stand alone system» is independent, more flexible and shows beside of other advantages a high productivity. |
Koleda V.N. and Ilyushenko V.M. Optimisation of parameters of additional gas shielding in submerged arc welding and surfacing of copper and its alloys | 38 |
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The paper presents the results of evaluation of influence of a combined shielding on gas saturation of metal at the stage of a drop and a pool in welding and surfacing of copper and its alloys. Parameters of the process of submerged arc welding and surfacing using an additional gas shielding were optimized. A new method of a pulsed supply of shielding gas into the arc zone in submerged arc welding and surfacing was developed. |
Kornienko A.N. Half-century anniversary of the first exhibition of achievements of welding production | 41 |
BRIEF INFORMATION |
Nazarenko O.K. and Shevchuk S.A. Selection of current sensor position in high-voltage power sources of welding guns | 45 |
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Studied were spectral characteristics of current flowing in the plus circuit of electron beam sources of accelerating voltage operating on industrial frequency or with high-frequency transformation. Recommendations on the position of resistive current sensor are given. |
Theses for a scientific degree | 46 |
NEWS |
News | 48 |
International Conference «MEE-2010» | 49 |
Technical Seminar «Aircraft Construction Å Technologies and Equipment for Welding» | 50 |
