Peculiarities of process of gas-shielded arc welding using flux-cored wire are considered. Given are the data on metallurgical characteristics and classification of the gas-shielded flux-cored wires with different core types as well as examples of their successful application in industry. 6 Ref., 1 Long-term application of solid flux-cored wires in mechanized and automatic gas-shielded welding was mainly caused by their availability and small price. Eventually, understanding of technological and economic advantages of application of the flux-cored wires was verified by the results of analysis of expenses for welding performance and quality of welded joints. This allows the flux-cored wire taking the leading position in performance of welding operations in different branches of industry and building in countries with high level of economic development [1]. Gas-arc welding using the flux-cored wire allows responsing the demands of manufacturers of welding structures, since it differs by versatile, good operation characteristics and high efficiency, that provides for significant reduction of economic expenses.Today a variety of types of the flux-cored wires are classified on international standards ISO in accordance with class of steel, for which they are designed. Standard ISO 17632 [2] is used for the most widespread classes of normal strength structural steels, and ISO 18276 [3] is applied for high strength ones. Shielding gases for performance of gas-arc welding are classified on standard ISO 14175 [4]. The classification in accordance with indicated standards is further used.The specialists in area of fusion arc welding know well that change of solid wire to flux-cored one does not require variation of basic technology or application of another equipment. Current welding equipment provide for a wide range of regulation of statistical and dynamic characteristics of power sources with the help of microprocessor technology, that allows setting of the optimum welding parameters for each wire type. Feed mechanisms of the semi-automatic machines are as a rule equipped with two pairs of rolls for reduction of wire pressure, prevention of its deformation or break of geometry, that deteriorate wire feeding through the hoses.Metallurgical characteristics of gas-shielded flux-cored wires. Established classification of the flux-cored wires on type of flux core, which is included into international standards, divide them on three main types, namely rutile, basic and metallic.Rutile type (on title of mineral -rutile) includes the wires with basis of a slag system composed of titanium oxides in combination with other oxides (for example, silicates and alumosilicates), formed in melting of low-basicity slags. Change of composition and application of fluxing agents reveal wide capabilities for regulation of technological properties of these wires. They are divided on rutile ones with slowly setting and rapidly setting slag according to the welding technological properties, that determines a possibility of their application for...
Cored wires are used in numerous welding processes with or without external gas or flux shielding. Submerged arc welding (SAW) with cored wires, seamed or seamless, for joining mild and low alloyed steel grades is a technique that has demonstrated clear advantages during the three last decades. Ever since its invention, the SAW process has evolved with one main goal: to combine quality with productivity. With low alloy wires, the benefits have already been clearly demonstrated and widely exploited. However, little has been written on SAW and cladding with cored wires for corrosion or heat resisting applications. Its extension to high alloy compositions brings corresponding benefits and adds some specific and unique features. This paper focuses on consumable specificities and on the quality and productivity features of SAW with CRA (corrosion resistant alloy) cored wires. It describes the potential as well as the limitations of this technique. Cored wires are now used for submerged arc welding of almost all stainless steels ranging from soft martensitic to super-duplex, and for a series of nickel base compositions as well as for cladding cobalt base alloys. Examples of industrial applications with austenitic, duplex, martensitic and heat resisting stainless steels are given to illustrate the potential of the cored wire solution. 13 Ref., 4 Tables , 25 Figures.
Pilot Plant of Welding Equipment is the leading production facility of Science-Technology Complex «E.O. Paton Electric Welding Institute». From the moment of the start of its operation in 1959, the main objective of the Plant was optimization of the technology of manufacturing new welding equipment, developed by scientists of the Electric Welding Institute. Over the past years, the Plant produced a lot of unique equipment-from high-precision small-sized units used for welding in space, up to high-power automated machines of «Styk», «Sever» type, for instance for flash-butt welding of large-diameter pipes, for welding longitudinal welds of pipes under the conditions of automated manufacturing, etc. At present the Plant focuses on manufacturing reliable welding equipment fit for operation under any production conditions. Today manufacturing of special-purpose welding and surfacing equipment, including automatic equipment, by special orders from major users takes up a considerable share of production. PPWE was the first to master batch production of inverter equipment in Ukraine. The Plant has good prospects of economic, and production development, and its products enjoy high consumer demand. Your enterprise has been successfully developing over the recent years. What promoted or contributed to beginning of intensive growth? Strategy of enterprise development was elaborated for long-term perspective. Our goal was to become the leaders in the production of welding equipment in Eastern Europe. To reach this goal, radical reconstruction of the Plant capacities was performed, modern market of welding equipment was analyzed, and priorities in the range of manufactured products were determined. Starting from the moment of its founding up to 1990, the Plant serially produced classical welding equipment (transformers, semi-automatic machines, rectifiers). Over all these years, hundreds of thousands of equipment pieces were manufactured for enterprises from almost all continents of the world. Over the next years, despite the instability of economic situation in the country, the Plant management always invested into enterprise development and brought together a team of professionals, literally «living in their business». This brought its results and today we occupy a significant part of the market of welding equipment and consumables in Ukraine and outside it. Over the last decade, production volumes increased almost
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