| SCIENTIFIC AND TECHNICAL | |
| Makhnenko O.V. and Makhnenko V.I. Prediction of fatigue life of welded assemblies in bridge arched pillars | 2 |
| Fatigue life of welded assemblies in bridge arched pillar was predicted on the basis of the information on a range of loads and rated stresses in their joints. | |
| Panin V.N. Experimental-calculation estimation of residual welding distortions in shells of turbine penstocks at hydraulic power stations | 7 |
| Application of electroslag welding in fabrication of shells of turbine penstocks at hydraulic power stations leads to a change in their shape under the effect of residual welding distortions. Given are the calculated dependencies of changes in shape of the shells, allowing for their geometric dimensions and technological factors. | |
| Fejnberg L.I., Rybakov A.A., Alimov A.N. and Rosert R. Weld microalloying with titanuim and boron in multiarc welding of large diameter gas and oil pipes | 12 |
| Microalloying of weld metal with titanium and boron in multiarc welding of pipes, performed through a flux-cored wire placed on one of the arcs, was investigated. This process is characterized by the use of neutral and sub-acid fluxes instead of the basic ones, which improves weld formation at increased welding speed. The optimal content of titanium and boron providing a high impact toughness of the weld metal was determined. Industrial tests of the welding process using the developed flux-cored wire of PP-ASF-1 grade yielded positive results. | |
| Nazarenko O.K. and Lanbin V.S. Investigation of high-voltage control circuits of welding electron beam current | 17 |
| High-voltage circuits for control of the welding gun beam current were studied using mathematical computer simulation. It is shown that in the case of using an independent control voltage source the spark breakdown in the emission system is accompanied by a long (about 10 ms) full opening of the emission system, this leading to a surge of current violating weld formation. Control of beam current using an automatic offset eliminates such dangerous current surges after spark breakdowns. | |
| Ostsemin A.A. Influence of surface defect on strength of welded joints with asymmetrical mechanical non-uniformity | 21 |
| On the basis of the plane problem solution method of the plasticity theory the design evaluation of the static strength with asymmetrical mechanical non-uniformity of welded joints with a surface crack-like defect is performed. Stressed state of mechanically non-uniform butt joints with a surface defect is investigated. The proposed methodology for evaluating static strength of welded joints with asymmetrical mechanical non-uniformity allows determining the load-carrying capacity by introduction into the calculation formulas of the mechanical non-uniformity coefficients. | |
| INDUSTRIAL | |
| Grechanyuk N.I., Kucherenko P.P. and Grechanyuk I.N. New electron beam equipment and technologies of producing advanced materials and coatings | 25 |
| The paper describes the current achievements of SPC «Gekont» in the field of practical application of the technologies of vacuum melting and evaporation of materials for deposition of thermal barrier coatings of MeCrAlY and other systems on gas turbine blades, producing condensed composite materials for diverse electric contacts, remelting the wastes of metals and alloys to produce sound ingots. Information on development and application of specialized equipment is given. | |
| But V.S. and Olejnik O.I. Main trends in technology for repair of active pressurised main pipelines | 30 |
| Design approach is proposed to development of repair technologies for pressurised main pipelines having different types of defects in their linear part using arc welding. Design-technological schemes of repair of pipelines and criteria for selection of repair methods, depending upon the character and parameters of defects, are given. | |
| Krivtsun I.V., Shelyagin V.D., Khaskin V.Yu., Shulym V.F. and Ternovoj E.G. Hybrid laser-plasma welding of aluminium alloys | 36 |
| Technological capabilities of the hybrid laser-plasma welding of aluminium alloys in comparison with plasma and laser welding were investigated. Properties of the welded joints made by hybrid method, as well as their micro- and macrostructure were investigated. It is shown that practical application of laser-plasma welding holds promise for thin-sheet aluminium alloys using lasers with a sharp-focused radiation spot. | |
| Pokhodnya I.K., Yavdoshchin I.R., Marchenko A.E., Skorina N.V., Karmanov V.I. and Folbort O.I. Low-hydrogen electrodes for repair of ships, metallurgical industry facilities and pipeline transport | 40 |
| Principles of formation of coatings for a new generation of low-hydrogen electrodes intended for repair of ships, metallurgical industry facilities and pipeline transport are considered, and their specification is given. | |
| Zhadkevich M.L., Pereplyotchikov E.F., Puzrin L.G., Shevtsov A.V. and Yavorsky M.N. Calculation of deposited layer thickness on components of oil-and-gas high-pressure valving | 44 |
| Serviceability of the shut-off unit components of the direct-flow high-pressure production Christmas tree valves is ensured by deposition on their working surfaces of the chrome-nickel alloys, doped by carbon, boron and silicon, using the plasma-powder surfacing method. It is shown that for reliable operation of the shut-off units of these valves a layer of the deposited metal should have a guaranteed thickness. It is established that for operation at up to 70 MPa pressure minimum thickness of the deposited layer should be 1.5 mm, and allowing for a possible repeated grinding Е up to 2.0mm. | |
| Lankin Yu.N. Computer system of monitoring the technological parameters of ESW | 48 |
| The computer system for acquisition, processing, display and storage of the data on technological parameters of the ESW process is described. | |
| NEWS | 51 |
| INFORMATION | 57 |
| Developed at PWI | 29 50 56 |
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