Contents of the Paton Welding Journal
no.3, 2010 |
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E.O. Paton - outstanding scientist, teacher and organiser of science and manufacturing (140th anniversary of the birthday) |
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SCIENTIFIC AND TECHNICAL |
Kuchuk-Yatsenko S.I., Chvertko P.N., Semyonov L.A., Samotryasov S.M. and Gushchin K.V. Peculiarities of flash butt welding of high-strength aluminium alloy 2219 |
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Peculiarities of flash butt welding of high-strength heat-hardening alloy 2219 were studied. It was shown that welded joint have no defects of the type of oxide films and delaminations. Optimal conditions for heating of the plastic deformation zone in upsetting were determined. A 15-20 % weakening of the heat-affected zone in the welded joints can be fully eliminated by postweld heat treatment (hardening and subsequent artificial ageing). Tensile strength of the welded joints is at a level of 93-95 % of that of the base metal. |
Lobanov L.M., Pashchin N.A., Loginov V.P. and Poklyatsky A.G. Effect of electric pulse treatment on residual change in shape of thin-sheet welded structures (Review) |
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It is shown that treatment of thin-sheet welded joints by electric current pulses is an efficient method for regulation of residual deformations of welded structures. With electric pulse treatment of butt welded joints on steel 30KhGSA and aluminium alloy AMg6, the values of sags of plates are decreased from 3 to 9 times. An advantage of this treatment consists in mobility of the equipment used, thus allowing its application for straightening of separate elements of large-sized thin-sheet welded structures, including those in service. |
Jianhua Yao, Liang Wang, Qunli Zhang, Zhijun Chen and Kovalenko V.S. Study of residual stress and mechanical properties of 2Cr13 stainless steel steam turbine blades by different laser surface modifications |
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As the key part of steam turbine, the blades work under the impact of high-speed steam and water droplet. Water droplet erosion on the inlet edge area is considered as the common failure pattern. In this paper, three laser surface modification ways including quenching, remelting and alloying were used to avoid water droplet erosion on the 2Cr13 stainless steel turbine blades. Residual stress and mechanical properties of the three modification methods were compared respectively. The result shows that the surface microhardness of blades increases after laser surface modifications. The tensile strength of the material is improved and meanwhile both the elongation percentage and reduction in cross sectional area are decreased. The impact fractures were all brittle fractures. The laser hardening zone presents residual compressive stress, and the heat-affected zone presents small transverse tensile stress. |
But V.S. Comparative evaluation of methods for determination of fracture toughness of HAZ metal of low-alloy steel welded joints |
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The article presents results of experimental studies of fracture toughness of the HAZ metal of low-alloy steel welded joints with different schemes of formation of a notch. Currently available methods for preparation of specimens and results of testing them to crack tip opening displacement under three-point loading were evaluated. |
Lankin Yu.N., Semikin V.F. and Sushy L.F. Control of sensorless dc drives of welding machines |
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Control circuits for reversible DC motors with speed stabilization by the electromotive force are described. Microprocessor-based transistor sensorless drive was developed, characterized by flat loading characteristics, absence of switching contacts for reversal, and possibility of precise setting of speed prior to starting the motor. |
Astakhov E.A., Kud I.V., Likhoded L.S., Zyatkevich D.P., Yakovleva M.S. and Eryomenko L.I. Production of powder of the Ni-Cr-Al-Y system alloy doped with silicon by the powder metallurgy method |
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The influence of solid-phase interaction of Ni-Cr-Al-Y alloy with silicon at up to 1100 °C temperature was studied. It was established that to produce the Ni-Cr-Al-Y + Si alloy it is expedient to use nickel mechanically doped with silicon as one of the initial intermetallic components of the alloy, this preventing presence of free silicon in the alloy and ensuring uniform distribution of silicon through the powder volume. |
INDUSTRIAL |
Romanov V.V. and Butenko Yu.V. Welding fabrication in gas turbine construction (Review) |
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The paper deals with modern developments of gas turbine units and commercial application of advanced welding and related technologies: electron beam welding, laser cutting, vacuum brazing, surfacing, etc. |
Shlepakov V.N., Gavrilyuk Yu.A. and Kotelchuk A.S. State-of-the-art of development and application of flux-cored wires for welding of carbon and low-alloyed steels |
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State-of-the-art in development of flux-cored wires for welding carbon and low-alloyed steels is considered. Main characteristics of flux-cored welding wires developed by the E.O. Paton Electric Welding Institute over the recent years, as well as properties of metal of the welds and welded joints made with these wires are presented. Recommended application field for these wires are listed. |
Mashin V.S. and Pashulya M.P. Features of consumable electrode pulsed-arc welding of aluminium alloys without application of forming backing elements |
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Technological features of automatic one-sided consumable electrode pulsed-arc welding in argon of butt joints of sheet aluminium alloys AMg6 and 1915T up to 3 mm thick without application of forming backing elements («gravity» welding) were studied. Influence of welding mode parameter modulation on the geometrical shape of welds and their macrostructure was shown. Recommendations on «gravity» welding technology are given. |
Tsumarev Yu.A. Resistance spot welding with special edges preparation |
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It is shown that beveled edge preparation of the parts to be welded ensures an inclined position of the mating planes, promoting lowering of power in spot weld formation, reduction of harmful influence of bending on the load-carrying capacity of the welded joint in resistance spot welding, and lowering of the degree of non-uniformity of shear and tear force distribution across the cast nugget section. |
News |
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