Contents of the Paton Welding Journal
no.4, 2009 |
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Page |
| SCIENTIFIC AND TECHNICAL |
Labur T.M., Taranova T.G., Grigorenko G.M. and Kostin V.A. Influence of thermal conditions of welding on the features of crack initiation in the HAZ of joints of aluminium alloys V96 and V96tss |
2 |
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The influence of thermal impact in nonconsumable electrode and electron beam welding on the features of cracking in different sections of the HAZ of high-strength complex-alloyed aluminium alloys V96 and V96tss at off-center tension has been analyzed. It is shown that the used temperature-time parameters of the welding mode change the volume fraction of particles contained in the alloy, their dimensions, shape and morphology of inclusion location on the boundary between the grains have an essential influence on the local stressed state in the HAZ metal and determine the associated mechanism of fracture site initiation. |
Ryabtsev I.I., Kondratiev I.A., Kostin V.A., Novikova D.P., Bogajchuk I.L. and Babinets A.A. Structure of phosphorus-containing deposited metal of the tool steel type |
8 |
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Peculiarities of structure of the deposited metal of the type of tool steels 30Kh4V2M2FS, 30Kh2M2NSGF and 35V9Kh3GSF, alloyed with 0Ä1.5 wt.% P, were investigated. Complex phosphides of the globular shape, containing vanadium, molybdenum, chromium, manganese and tungsten, i.e. metals the phosphides of which exhibit the highest thermodynamic stability, were found to form in the high-alloy deposited metal. The presence of such phosphides does not deteriorate crack resistance of the investigated types of the deposited metal. |
Nosov D.G. and Razmyshlyaev A.D. Effectiveness of application of combined magnetic fields in submerged-arc welding |
16 |
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It is suggested that a combination of three magnetic fields be applied to widen the possibilities of controlling the shape and size of the penetration zone in submerged-arc wire hardfacing. Mathematical models establishing a relationship between induction of components of a combined magnetic field (CMF) and cross-section size of the deposited beads were developed by employing the experimental design and regression analysis methods. Software with a friendly interface was developed for computation and optimization of technological modes of arc hardfacing in CMF, and the extent of impact of the induction of components, as well as a combination of these components of magnetic fields on cross-section sizes of the deposited beads is shown. |
Alapati R. and Dwivedi D.K. Microstructure and hardness of Al-Cu alloy (A2218) welded joints produced by GTAW |
21 |
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This paper describes the microstructure, phase analysis and microhardness of AlÄCu (A2218) alloy welded joints produced by pulse gas tungsten arc welding process in as welded and heat-treated condition. Welded joints were produced by two combinations of pulse parameters. Decrease in hardness was observed with postweld heat treatment of welded joints. Higher pulse frequency of 100 Hz showed finer grain structure of weld metal as compared with that at low pulse frequency 50 Hz. Heat treatment led to significant reduction in fraction of second phase constituents in HAZ and weld metal, and spheroidization of the eutectic silicon took place. |
Pashchenko V.N. Effect of the composition of plasma air-gas mixture on parameters of the plasmatron jet |
27 |
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The possibility of controlling energy parameters of plasmatrons with a combined energy supply is studied. It is shown that changing the content of a hydrocarbon component in the initial plasma mixture allows changing over a wide range the absolute value of the plasmatron power and its specific energy parameters during operation, as well as influencing the oxidation-reduction potential of a working medium and conditions of electrode operation. Several possible modes of operation of plasmatrons with the hydrocarbon component in the initial plasma mixture are proposed, allowing changing conditions of the technological process by using the same unchanged design. |
| INDUSTRIAL |
Tsybulkin G.A. Control of manipulation robot force action |
32 |
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The non-traditional approach towards the solution of problem of control of the manipulation robot force action on contact surface under the conditions of its free location in the working space of robot has been proposed. The algorithm providing the stabilization of a force action at a desirable level has been outlined. |
Ilyushenko V.M., Butakov G.A., Ganchuk A.V., OstapchenkoV.A. and Goryajnov N.A. Comparative tests of welding-technological properties of inverter and thyristor power sources |
34 |
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The approach towards determination of technological properties of power sources based on the results of comparative testing the new and earlier applied models of welding equipment is described. The structure and composition of system of acquisition and recording of data about the main parameters, characterizing the properties of welding equipment, are given. The comparative characteristics of power sources VDUCh-500, VD 506 DK, VDUCh-350 and VS 300 B are shown. The testing methods and methods of processing the statistics information obtained during tests are described. |
Reisgen U. and Olschok S. Laser-submerged arc hybrid welding |
38 |
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This paper presents a novel method Å laser-submerged arc hybrid welding Å for the production of thick-walled parts, for example, structural tubes in pipeline construction or shipbuilding sections. The process-specific advantages and disadvantages are explained. It is further examined whether the welds which have been produced by this method will meet the requirements of the industry and which problems, if any, might occur. |
Dzykovich V.I. Effect of the centrifugal thermal spraying process on properties of spherical tungsten carbide particles |
43 |
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Effect of the centrifugal thermal spraying process on structure, microhardness and stoichiometric composition of spherical tungsten carbide granules was investigated. Comparative analysis of initial spraying materials (ingots) and spherical particles was conducted. It is established that the granulated WCÄW2C particles, having the highest microhardness and wear resistance, can be produced only as a result of remelting of a spraying material. |
| BRIEF INFORMATION |
Murashov A.P., Demianov I.A., Grishchenko A.P., BurlachenkoA.N. and Vigilyanskaya N.V. Application of protective extension in thermal spraying of quasi-crystalline coatings |
46 |
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The efficiency of application of an extension in plasma spraying of coatings from quasi-crystalline alloy Al-Cu-Fe was studied. It was established that the extension allows increasing the amount of the icosahedral phase in a coating by improving the heating conditions and lowering the degree of oxidation of a spraying material. |
News |
48 |
| NEWS |
Ukrainian-Belarussian Meeting-Presentation of the Technology of Live Tissue Welding |
49 |
Developed at PWI |
15 |
