Contents of the Paton Welding Journal
no. 6, 2010 |
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SCIENTIFIC AND TECHNICAL |
Krivtsun I.V., Demchenko V.F. and Krikent I.V. Model of the processes of heat, mass and charge transfer in the anode region and column of the welding arc with refractory cathode |
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The main difference of the proposed mathematical model of the welding arc from the known ones describing the atmospheric-pressure arcs is allowance for the multi-component composition of the arc plasma, which is caused by evaporation of the anode metal and convective diffusion of metal vapours in the arc column. The model can be used for numerical analysis of thermal, gas-dynamic and electromagnetic characteristics of the arc plasma in inert-gas tungsten-electrode and plasma welding, as well as for modelling of thermal and dynamic effects of the arc on the weld pool surface. |
Makhnenko V.I., Markashova L.I., Berdnikova E.N., Shekera V.M. and Onoprienko E.M. Kinetics of corrosion crack growth in 17G1S pipe steel |
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Relationship between the rate of growth of corrosion cracks and stress intensity factor was described on the basis of the static corrosion crack resistance diagram. The main working hypothesis that crack growth is of a discrete nature was proved by means of analytical scanning microscopy. |
Som A.I. and Zelnichenko A.T. Numerical calculation of thermal processes in centrifugal plasma powder cladding |
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In this work, thermal processes running in the thick-walled pipe wall at centrifugal plasma powder cladding were studied by computational experiment method. Temperature fields in each point of the item were calculated, depending on the cladding mode. A measuring stand and procedure for determination of the heat transfer coefficient and effective thermal power were developed. |
Dmitrik V.V. and Bartash S.N. Features of damageability of steam pipeline welded joints by the creep mechanism |
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Considered are the features of damageability of long-term operating welded joints from heat-resistant pearlitic steels by the creep mechanism. It is shown that damageability of welded joints is a three-stage process, and essentially depends on metal degradation, which is controlled by physicochemical processes occurring in welded joint metal. |
Kravchuk L.A. Elimination of undercuts in EBW with complete and incomplete penetration |
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Some peculiarities of formation of crater and weld pool in electron beam welding of 17 mm thick titanium alloy VT20 with complete and incomplete penetration in different positions are considered. Welding schematics and parameters providing defect-free formation of the face and reverse weld beads are given. |
Bely A.I. Influence of main technological parameters of the plasma cladding process on properties of composite deposited metal |
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The paper presents results of experiments on determination of the influence of technological parameters of the process of plasma cladding of composite alloys using filler material in the form of flux-cored strip consisting of a metal sheath and core, on formation and wear resistance of deposited metal. The strip core contained hard-alloy grains based on fused tungsten carbides. |
INDUSTRIAL |
Kuchuk-Yatsenko S.I., Kachinsky V.S., Ignatenko V.Yu., Goncharenko E.I. and Koval M.P. Magnetically-impelled arc butt welding of parts of automobile range of products |
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Peculiarities of magnetically-impelled arc butt welding of parts of the automobile range of products, including compact hollow parts of steering rod, shock-absorber and torque rod, are described. Results of metallographic examinations as well as evaluation of mechanical tests, proving the high quality of welded joints, are presented. |
Kah P., Salminen A. and Martikainen J. Laser-arc hybrid welding processes (Review) |
32 |
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This study deals with the different types of hybrid welding processes in addition to describing the means and situation today regarding the principles and applications of various combinations of laser with welding arc. The processes are analyzed regarding their parameters involved and the type and thickness of the base material. This study looks into the productivity, economy and quality of laser hybrid welding and provides some fundamentals of the set-up of its parameters. The effects of parameters and set-up can be seen in the analysis, thus, the economic feasibility and quality management factors as the basis of analysis can be assessed. |
Khorunov V.F., Maksymova S.V. and Stefaniv B.V. Manufacture of drill bits for production of dispersed methane in mine working |
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The effect of the brazing temperature on performance of diamond-hard alloy cutters was investigated. It was shown that a combination of the developed brazing filler metals and technology provided a substantial increase in length and rate of well drilling, which was proved by the industrial test results. |
BRIEF INFORMATION |
Sidorenko P.Yu. and Ryzhov R.N. Application of pulse electromagnetic effects to control the process of electrode metal transfer in arc welding |
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The impact of electromagnetic effects induced by axial pulse magnetic fields on parameters of electrode metal transfer in metal-arc welding was evaluated. |
NEWS |
Solemn Meeting Dedicated to the Jubille of Victory in the Great Patriotic War |
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INFORMATION |
Automatic machines ADTs 625, ADTs 626 and ADTs 627 for orbital welding of pipelines |
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