The Paton Welding Journal 2005 #02

Grigorenko G.M., Golovko V.V., Kostin V.A. and Grabin V.F.
Effect of microstructural factors on sensitivity of welds with ultra-low carbon content to brittle fracture
Morphological features of microstructure of weld metal with ultra-low carbon content have been studied. It is shown that in such welds both MAC-phase and lamellar forms of ferrite are the structural factors that cause instability of properties. It has been found that the content of the MAC-phase should not exceed 5Д6 vol.% at a low content of ferrite with an ordered secondary phase to provide consistently high properties at low temperatures. It is shown that impact toughness of the welds studied rises with increase in the content of the ductile component in fracture.
Maksimov S.Yu.
Evaluation of the influence of wet underwater welding conditions on the probability of pore formation in the weld metal
A numerical method was used for evaluation of the influence of hydrostatic pressure, velocity of motion of weld pool solidification front and hydrogen concentration in the molten metal in wet underwater welding on the value of critical radius of gas nuclei. Obtained results enable establishing the regularities of the influence of underwater welding conditions on the susceptibility to pore formation.
Kuzmenko V.G. and Guzej V.I.
Pore formation in weld metal in submerged arc welding with surface saturation of grains with fluorine
Properties were studied of fused welding fluxes of manganese-silicate type, not containing fluorine and subjected to fluorinating heat treatment together with ammonia salt of hydrofluoric acid (NH4F) and magnesium hexafluosilicate (MgSiF6). It is established that the weld metal resistance to pore formation is achieved, when using 0.5 % each of the above salts for flux treatment. Fluorine content in the flux is equivalent to adding 0.4 % CaF2 to it. The effect is achieved due to local arrangement of fluorine on the flux grain surface.
Shonin V.A., Gushcha O.I., Mashin V.S., Kovalchuk V.S. and Kuzmenko A.Z.
Influence of the dimensions of a specimen of aluminium alloy welded joint on the residual stressed state and fatigue resistance
The paper presents the results of evaluation of residual stresses in butt welded joints of aluminium alloy AD33 (6061) 6 mm thick on specimens of different width (70Д600 mm) produced by TIG and MIG welding processes. Experiments are used to demonstrate the influence of longitudinal and transverse tensile residual stresses on the strength and fatigue life of welded joints with a transverse weld under axial load.
Ulshin V.A. and Kharlamov M.Yu.
Optimization of parameters of detonation-gas spraying using a genetic algorithm
A method is proposed to determine the optimum process parameters of detonation-gas spraying of coatings by the criterion of energy characteristics of the spray powder particles, which is based on the use of a genetic algorithm. Advantages of this approach are demonstrated compared to other methods of solving the optimization problems, and computer simulation is used to demonstrate its effectiveness.
Blashchuk V.E. and Shelenkov G.M.
Fusion welding of titanium and its alloys (Review)
Practical applications of different methods for fusion welding of titanium and its alloys are reviewed. Recommendations on the use of these welding methods are given, and their advantages and disadvantages are considered.
Shelyagin V.D., Khaskin V.Yu. and Lukashenko A.G.
CO2-laser cutting of disk saw bodies
It is shown that laser cutting is a good choice for manufacture of disk saw bodies made from steel 65G sheets 2 to 6mm thick. This cutting method provides high quality and small width of a cut, minimum HAZ and low manufacturing costs. Good prospects for development of a hybrid laser-plasma cutting technology are noted. The technology is characterised by stabilisation of the arc plasma by the laser beam and its additional contraction, thus making plasma penetrate into the keyhole formed in cutting.
Vornovitsky I.N., Zakharova N.V., Shishkova O.V., Vilisov A.A. and Zinchenko A.V.
Technological peculiarities of high-alloy steel welding by electrodes with rutile coating
The paper presents the technological advantages of rutile type electrodes for high-alloy steel welding, compared to electrodes with a basic coating type. Information is given on the new grades of electrodes, developed at CJSC "Elektrod".
Illarionov S.Yu., Dobrushin L.D., Polyakov S.G. and Boeva G.E.
Increase of corrosion resistance of welded joints of high-strength aluminium alloys by explosion cladding
Evaluation of explosion welding application was conducted for the case of cladding welded joints of aluminuim alloys 7010 and 2024 with pure aluminium. It is shown that such a protection of welds prevents stress corrosion cracking or intercrystalline corrosion.
Zhadkevich A.M.
Sources of beam heating for brazing (Review)
The paper deals with the features of development of the design and application of technologies using the electron beam, laser, quartz lamps, as well as solar energy. It is shown that the inertialess heat sources enable controlling the heat input in a broad range, which allows considerable widening of the scope of brazed materials. Intensive development of the technique of brazing using concentrated heat sources is noted.
Kiselevsky F.N., Dolinenko V.V. and Topchev D.D.
Method of software development using control graphs and languages means ISaGRAF for intelligent welding controllers
A new method is proposed to develop software of intelligent welding controllers, using control graphs of the states and SFC language of ISaGRAF package. An example is considered of synthesis of a child program "Arc ignition" for the arc power source controller of TIG welding CAM system.
Theses for scientific degrees 60

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