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- W2188992917 abstract "The possibility of modernization of welding operations in technological pro- cess of welded joints manufacturing in devices for oil and gas refining is considered as the pur- pose of improvement of mechanical properties of welded joints and decrease in level of residual welding stresses on an example of welding under flux of square butt joints of plates from steel 09Mg2Si. The methods of carrying out the experimental studies with the description of the chosen modes of welding and accompanying processing are resulted. The results of tests of welded spe- cimens on static stretching, impact strength, and also results of metallographic and hardness research are presented. Optimization of technological process of manufacturing the equipment as a who- le covers problems of accuracy, productivity and profitability simultaneously ensuring operational reliability of details in parts of machines. Its importance especially increases in connection with wide automation of apparatuses-building manufacture. The majority of the vessel type oil and gas equipment is made by welding beca- use today to provide impermeability of connection of big diameter vessels is possible just by arc welding, its type and characteristics depending on the type of material, thick- ness of a detail and the kind of connection required. Despite the wide nomenclature of existing welding processes (manual arc welding, gas metal arc welding, submerged arc welding etc.) all above-mentioned processes have common local character of heating, high speeds of heating to the temperatures exceeding temperatures of metal melting (3000 °С at gas and 4000 °С at arc welding), that causes significant temperature stress and deformations, inhomogeneous structural transformations in a seam and heat-af- fected zones and other factors negatively influencing working ability of the weldied joint (6). Therefore considering specificity of oil refining branch, the above-mentioned equipment is required to have high level reliability. The general indicators of reliability of the vessel type oil and gas equipment depend on similar indicators of welded joints, as the weakest parts from the point of view of presence of defects, concentrators of stress, inhomogeneous properties of metal and other negative factors. Today the basic ways of prevention and dealing with the above-mentioned neg- ative factors are the application of various types of thermal operations (preliminary and accompanying heat-treatment, annealing). Specific features of thermal operations, espe-" @default.
- W2188992917 created "2016-06-24" @default.
- W2188992917 creator A5015039266 @default.
- W2188992917 date "2012-01-01" @default.
- W2188992917 modified "2023-09-25" @default.
- W2188992917 title "MANUFACTURING TECHNOLOGY UPGRADING OF WELDED SHELLS OF VESSELS FOR OIL AND GAS REFINING" @default.
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