Contents of the Paton Welding Journal
no.5, 2009 |
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Page |
| SCIENTIFIC AND TECHNICAL |
Makhnenko V.I., Shekera V.M., Velikoivanenko E.A., Olejnik O.I., Rozynka G.F. and Pivtorak N.I. Analysis of conditions causing initiation and propagation of corrosion cracks in zones of circumferential joints on main gas pipelines | 2 |
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The paper deals with conditions causing formation of corrosion cracks within the zones of circumferential field and longitudinal factory welded joints on main gas pipelines. Described is the case study of force conditions and resistance of material to initiation and propagation of stress corrosion cracks up to a spontaneous fracture. |
Nesterenkov V.M., Protosej N.E. and ArkhangelskyYu.A. Technological features of electron beam welding of drill bits | 8 |
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The peculiarities of electron beam welding of drill bits applied in oil production industry are considered. It is shown that the best quality of weld is achieved using elliptical scanning of electron beam at ratio of axes 2:1 and maximum amplitude equal to two radii of concentration of electron beam. To improve the quality of weld in a rotary part of drill bits, it is recommended to use inserts of modifying materials in the form of foil of up to 0.2 mm thickness. |
Nikonova E.S., Korab N.G. and Kondratenko V.Yu. Stress-strain state of welded joints on polymer pipes produced by butt welding at an angle | 15 |
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The stress-strain state of butt welded joints made at different angles was studied, and distribution of equivalent stresses across the weld section was calculated. The ranges of angles to the lower generatrix in butt welding were determined, within which it is necessary to mount additional hold-down devices to level the existing gradient of stresses in the weld. A new technological solution was found in the form of a device for welding thermoplastic pipes, for which a patent of Ukraine was granted. |
Korzh V.N. and Popil Yu.S. Peculiarities of utilization of hydrogen-oxygen flame in flame treatment of materials | 17 |
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Peculiarities of utilization of hydrogen-oxygen flame in flame treatment of materials are generalized, the flame being formed by combustion of a mixture produced by electrolysis-water generators. The study shows that it is possible to regulate the reduction potential of the combustion product flame with respect to iron, and control the overall thermal power due to saturation of the mixture with hydrocarbon additions. |
| INDUSTRIAL |
Bach Fr.-W., Beniyash A., Lau K. and Konya R. Nonvacuum electron beam welding of structural steels | 22 |
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Given are experimental results of application of nonvacuum electron beam welding for joining structural and high-strength steels up to 20 mm thick. It is shown that no machining of edges prior to welding is required after plasma and laser cutting. The high quality of welded joints was proved by comprehensive tests. |
Kah P., Martikainen J., Jernstrom P. and Uusitalo J. Influence of joint geometry and fit-up gaps on quality of corner joints in new modified short arc GMAW | 27 |
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The effect of process parameters on the fit-up gaps in new modified short arc gas metal arc welding (GMAW) and the conventional short arc GMAW for steel plates is described. The modified short arc GMAW offered a number of advantages over the conventional short arc GMAW of fillet weld between two sheet plates in a corner joint in vertical downward welding direction. It was found that a higher welding speed and a smaller HAZ are reached using less energy with the modified short arc GMAW than with the conventional GMAW process. It was noticed that the modified short arc GMAW possesses approximately 25 % less heat input than the conventional GMAW, and modified short arc is 10 % faster than in conventional GMAW. |
Barvinko A.Yu. Evaluation of residual life of welded joints on tank vertical wall after 20Ä25 years of service | 34 |
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The paper presents the results of experimental investigations of the residual service life of shop vertical butt welded joints of 16G2AF steel on a coiled tank wall after 20-25 years of service. No changes of mechanical properties with time were found, including their cold resistance. It is established that the studied welded joints have the residual service life sufficient for their further operation for not less than 20 more years. |
Malinov L.S., Malinov V.L., Orlov L.N. and GolyakevichA.A. New flux-cored wire ensuring the effect of strain hardening of the deposited metal in operation | 38 |
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The paper gives information on a new flux-cored wire, not containing expensive alloying elements. Wire application ensures production of a metastable austenite structure in the deposited metal and realization of deformation martensite transformation during operation. This results in an essential increase of the surfaced part fatigue life. New wire can become widely accepted in manufacture of rapidly wearing parts for the most diverse applications. |
| BRIEF INFORMATION |
Shapovalov E.V. and Kolyada V.A. Seam-tracking system in anticorrosion coating units | 41 |
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A tracking system is developed which is designed for detection of weld reinforcement bead on a rotating pipe and controlling the polymer dosing at deposition of an anticorrosion polymer coating on the outer surface of welded pipes. System introduction will allow an essential improvement of uniformity of thickness of anticorrosion coating on pipes. |
| NEWS |
Exhibition «Metals of Siberia: Metallurgy, Machine-Building, Metal-Working, Welding» in Novosibirsk | 43 |
Developed at PWI | 33
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