The Paton Welding Journal, 2013, #3, 38-45 pages
APPLICATION OF MECHANIZED WELDING WITH SELF-SHIELDING FLUX-CORED WIRE IN REPAIR OF METALLURGICAL EQUIPMENT
V.N. SHLEPAKOV1, Yu.A. GAVRILYUK1, A.S. KOTELCHUK1, V.N. IGNATYUK1, P.A. KOSENKO2, O.N. ROKHLIN3 and A.V. TOPCHY3
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
SE «Pilot Plant of Welding Consumables of the E.O. Paton Electric Welding Institute», Kiev, Ukraine
PJSC «Dneprovsky F.E. Dzerzhinsky Metallurgical Works», Dneprodzerzhinsk, Ukraine
The state-of-the-art and characteristics of objects of repair-and-restoration welding of equipment of mine-metallurgical equipment were considered. It was established that reduction of time of welding during repair of metallurgical equipment and increase of reliability of welded structures are possible due to widening of application of mechanized welding using self-shielding flux-cored wire. The investigation of physical and chemical properties of powder mixtures, modeling the cores of self-shielding flux-cored wires, allow determining the ways of increasing the technological characteristics of those wires during development of their compositions. The results of works on improvement of technology of production of flux-cored wires, allowing application the efficient routes of drawing, suitable for manufacture of flux-cored wires of small diameter (1.6 mm) per one stage of drawing using six-fold drawing mill. The successful realization of technology of wire drawing with deposition of protective coating on its surface for protection against corrosion and prevention of wetting of core materials. The successful examples of implementation of mechanized welding using flux-cored wire on the typical objects pf repair-restoration works of enterprises of mine-metallurgical complex were shown. The evaluation of technical and economical characteristics of application of welding using flux-cored wires during repair-restoration works was made by calculation of expected economic effect from the replacement of manual arc welding by the mechanized one on the example of capital repair of converter. The decrease of cost of steel being melted is achieved by decrease of conditionally-constant costs at the general decrease of terms of the converter repair. 11 Ref., 7 Figures.
repair-restoration welding, flux-cored wire, service life, equipment, mine-metallurgical complex
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