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 The Paton Welding Journal 2002 #04

Podola N.V., Gavrish V.S. and Rudenko P.M.
Selection of input variables and structure of neural network to evaluate the quality of resistance spot welding.
Analysis of input parameters of neural networks to control the quality of spot welding was conducted. The principal requirements to neural networks have been defined. It is shown that the proposed neural network ensures the required accuracy of predicting the weld spot nugget diameter and can be built into the microcontroller to control the spot welding process.
Ponomaryov V., da Costa A.V. and Scotti A.
Effect of an electrode metal droplet on arc voltage in gas-shielded welding.
Voltage drop at an electrode metal droplet and its effect on the arc voltage value have been determined. Geometrical parameters of the droplet and length of the arc have been estimated using a machine consisting of laser and high-speed digital video camera, by synchronously registering the arc voltage and welding current curves. It has been established that the voltage drop per unit length of the droplet may exceed the voltage drop gradient in the arc column, and the arc voltage may increase with growth of the droplet and reduction of the arc voltage.
Cherepivskaya E.V. and Ryabov V.R.
Fusion welding of dispersion-strengthened aulminium-based composite materials, ontaining silicon carbide particles (Review).
A review of the current methods of fusion welding of Al-based dispersion-strengthened composite materials (DSCM), reinforced with silicon carbide particles is presented. Processes, proceeding in arc welding of Al-based DSCM are considered in detail. Mechanical characteristics of welded joints on composite materials are given, and problems, arising in their fusion welding, are considered.
Kalin N.A. and Efimenko N.G.
Peculiarities of carbon oxidation in welding with ilmenite-covered electrodes.
It was established that the process of decarburization of Fe-C alloy, for example, in the form of cast iron, in electrode coatings occurs mainly in the slag phase under the lower part of a growing droplet. Oxygen dissolved in metal and coming from the slag serves as oxidizer of carbon in the melt. It was found that losses of carbon for oxidation in the Fe-C alloy are 1.5 times higher than those of graphite, and the rate of decarburization at the droplet stage is twice as high.
Radkevich A.I.
Effect of deformation on electrochemical heterogeneity of pipeline welded joints.
Electrode potentials have been measured in various zones of a circumferential welded joint on low-carbon steel pipes at different levels of loading using internal pressure. It is shown that plastic deformation eliminates completely the difference of potentials between the parent metal and HAZ of the welded joint.
Kovalchuk V.S.
Allowance for effect of cycle asymmetry on fatigue resistance of welded joints.
The paper deals with an engineering method of calculating estimation of the influence of cycle asymmetry on fatigue resistance of steel welded joints at different values of base in the high-cycle region of fatigue life. An informative diagram of limiting ranges of stresses based on asymmetry parameters and number of cycles, as well as analytical expressions for its description are suggested.
Pentegov I.V. and Petrienko O.I.
Method of calculation of voltage drop in electrode stickout length with allowance for non-linearity of thermophysical parameters.
The offered method is valid for the electrode stickout area, i.e. from the nozzle inlet to stickout adjacent to the droplet. Expressions for determination of current values of voltage drop in the electrode stickout length as functions of temperature and relations between the current length of electrode stickout and temperature at the end of the given area of stickout are presented.
Lukina G.N., Bolshakov M.V. and Pidgajchuk S.Ya.
Properties of magnetron coatings on the Fe-Cr-Ni base with amorphous structure.
Structure and properties of coatings produced by magnetron sputtering of targets of stainless steel of the 18-10 type with molybdenum additions have been investigated. As shown by X-ray diffraction analysis, the Fe-Ni-Cr-Mo coatings are characterised by an amorphous structure, stable in the 293-823 K range. The coatings are proved to have high values of microhardness (8.5-9.0 GPa) and corrosion resistance in aqueous salt solutions.
Bernadsky V.N., Maksimov S.Yu. and Netrebsky M.A.
Floating welded megastructures (Review).
The paper presents a review of Japanese publications, devoted to world's first experience of designing, construction and studying the performance of floating welded megastructures
Panchenko V.Ya. and Golubev V.S.
Development of laser technologies for materials treatment at the Institute for Problems of Laser and Information Technologies.
New trends in upgrading equipment and technology for laser treatment of materials, developed at the Institute for Problems of Laser and Information Technologies of the Russian Academy of Sciences, to be applied for welding, cutting, surface treatment, stereolithography and laser diagnostics are briefly described.
Ryabtsev I.A., Kondratiev I.A., Vasiliev V.G. and Doroshenko L.K.
Wear resistance of deposited metal of Fe-C-Cr-Ti-Mo alloying system.
Resistance of deposited metal of type of high-carbon Cr-Ti-Mo steel under the conditions of abrasive wear was studied. High wear resistance of deposited metal of this type is explained by the ability of austenitic-martensitic matrix of alloy to prevent the бhipping of titanium carbides at the expense of formation of coherent bonds at the austenite-carbide interface. Optimum composition of deposited metal was selected and self-shielding flux-cored wire was developed on the basis of results of investigations.
Tararychkin I.A. and Tkachenko A.N.
Repairing defects in thick metal using the technology of narrow-gap arc welding.
The paper gives the results of welding technologies application to repair a crack in the body of a large-sized structure. It is shown that the maximal effectiveness of the repair operations can be achieved when using the technology of narrow-gap arc welding.
Dragobetsky V.V.
Technology for explosion hardening of support surfaces of axle boxes.
Technology for hardening support surfaces of bodies of railway car axle boxes made from aluminium alloy Al-6.2Mg and high-strength cast iron is described. Technology parameters of explosion welding of steel to aluminium plates, as well as Hadfield steel plates to cast iron parts are given.
Welding in surgery - a new direction in welding technology. 54
U.S. Congressman visits the E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine. 56

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