| SCIENTIFIC AND TECHNICAL | |
| Karkhin V.A., Iliin A.S., Ploshikhin V.V. and Prikhodovsky A.A. Effect of heat of aluminium alloy melting on shape and sizes of weld pool. | 2 |
| An algorithm is developed for solving the quasi-stationary temperature problem taking into account the heat of melting and solidification, based on the method of sources (Green function). The case of welding thin aluminium plate is used to demonstrate that the melting heat has a significant influence on the shape and dimensions of the weld pool and solid-liquidus zone. It is noted that the thermal efficiency of the process of melting ht of a plate by a linear source can be much higher than 0.4839 with allowance for the melting heat. Known simplified methods with allowance for melting heat may lead to significant errors in ht determination. A comparison of calculated and experimental shape of the weld pool is given. | |
| Shejko P.P., Zhernosekov A.M. and Shimanovsky Yu.O. Consumable-electrode pulsed-arc welding with automatic stabilization of mode parameters. | 7 |
| The paper gives the results of studying the developed two-loop system for automatic stabilization of average values of arc voltage and welding current in consumable-electrode pulsed-arc welding by regulation of the parameters of the power source pulses and electrode wire feed rate, respectively. Separate and combined influence of the disturbing production factors (change of electrode extension, lowering of mains voltage) on the process of consumable-electrode pulsed-arc welding of low-alloyed steels and quality of weld metal has been studied. | |
| Makhnenko V.I., Maksimov S.Yu. and Korolyova T.V. Investigation of peculiarities of transport of hydrogen in underwater fusion welding of structural steels. | 11 |
| Peculiarities of transport of hydrogen in wet underwater arc welding of a root pass of the butt joint in low-carbon and low-alloy steels are considered using the calculation-experimental method. Effect of the depth of welding and type of a filler metal on the concentration of hydrogen in the weld and HAZ metal is shown. | |
| Borisov Yu.S., Zatserkovny A.S. and Krivtsun I.V. Mathematical modelling of the process of plasma spraying of composite powders allowing for the exothermic reaction of synthesis of coating material. | 22 |
| Mathematical model has been developed for calculation of dynamics of heating of composite powder particles in a plasma jet, allowing for the heat released as a result of chemical reaction between the initial components of powder materials. Software has been developed to implement the model on a computer. Numerical analysis has been conducted for peculiarities of heating and movement of composite particles Ni--Al in the plasma jet, allowing for the heat released in the bulk of the particles through the exothermic reaction of formation of an intermetallic compound. | |
| Kireev L.S., Shurupov V.V., Peshkov V.V. and Besplokhotny G.P. Effect of the process fixture material on strength characteristics of titanium and its diffusion bonds. | 25 |
| Effect of material of a fixture used for diffusion bonding of thin-walled layered structures of titanium on its performance has been established. Fractography data and mechanical test results show that performance of the bonds in titanium is higher in the case of using the fixture of steel 20, compared with steel 12Kh18N10T. | |
| INDUSTRIAL | |
| Paton B.E., Chepurnoj A.D., Saenko V.Ya. and Medovar L.B. Prospects in production of welded thick-walled bimetal bodies of high-pressure vessels. | 28 |
| Main stages in creation of technology of manufacturing thick-walled bimetal high-pressure vessels are described and prospects in development of production of bimetal vessels at the present stage are outlined. | |
| Lebedev V.K. Tendencies in development of power sources and control systems (based on materials of US patents). | 37 |
| The paper presents US patent information over the last two years outlining modern trends in the field of development of power units and control systems for arc and resistance welding processes. | |
| Kuchuk-Yatsenko V.S., Sakhatsky A.G. and Nakonechny A.A. Resistance welding of silver-copper current-carrying busbars. | 46 |
| Technology of resistance welding in air and shielding gas atmosphere has been developed for joining flexible copper busbars to silver plates welded to contact pads for manufacturing flexible connections for high-voltage vacuum switches. It has been established that the use of a certain thermal-deformation cycle can provide a sound welded joint on the copper-silver foil pack. The mechanisms of deformation of the pack and formation of a welded joint have been studied. A pilot welding machine and control unit have been manufactured. | |
| Khorunov V.F., Shvets V.I., Taranova T.G. and Kobzenko G.F. Fusibility curves for alloys of the Sn-Zn-Bi system. | 49 |
| Fusibility curves and structural peculiarities of alloys of the Sn-Zn-Ni systems in a range of Sn-rich compositions were studied using differential thermal analysis. The resulting data can be employed for development of commercial Pb-free solders for soldering parts used in radio electronics. | |
| BRIEF INFORMATION | |
| Zagornikov V.I. EBW of a flame tube case of a stationary gas turbine. | 52 |
| Welding and assembly techniques, as well as peculiarities of manufacturing a serviceable unit, i.e. blocks of shells of output circuit of a gas turbine combustion chamber are described. Advantages of electron beam welding used to manufacture parts of heat-resistant nickel-base alloy 04KhN60VT over argon-arc and manual welding are shown. | |
| Orlov L.N., Golyakevich A.A., Novikova D.P., Peleshko V.N. and Simonenko V.V. Flux-cored wires for welding and repair of defects in 110G13L steel castings. | 55 |
| Poor weldability of steel 110G13L, caused by a growth in heat input, is outlined. Electrodes, developed at different periods of time for welding Hadfield steel and its dissimilar joints, are described. Characteristic of flux-cored wires WELTECH-H220u and WELTECH-210u, developed by TM. WELTECH for the repair of 110G13L steel castings and welding of dissimilar joints of this steel with steel 20GSL, is given. | |
| European program NOMAD on development of a robotic cell for highly-efficient welding of specialized structures. | 58 |
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