The possibility of making welded steel joints using arc welding in a reducing medium of carbon monoxide was studied. A method was proposed to eliminate its negative biological effect by heating the feed gas above its flash point, followed by oxidation till carbon dioxide was obtained. Welding modes have been selected to ensure the formation of a quality welded joint. Comparative studies of welded joints obtained using an oxidizing atmosphere of carbon dioxide and a reducing atmosphere of carbon monoxide were carried out. A chemical and metallographic analysis of welded joints was performed. The thermodynamic substantiation of chemical reactions in which carbon and microalloying additives can participate was presented. It was established that the main difference between the proposed welding method and those used at present was the suppression of oxidative processes in liquid metal due to the presence of a reducing atmosphere.
Modern methods of welding high-strength reinforcing steels were analyzed. Comparative studies of welded joints obtained using manual arc welding and welding in a reducing atmosphere of carbon monoxide were carried out. A chemical and metallographic analysis of welded joints was performed. It has been established that welded joints of microalloyed steels made at low temperatures may have reduced strength and viscous properties. The possibility of making welded steel joints using highly-efficient arc welding in a reducing medium of carbon monoxide was investigated. Welding modes have been selected to ensure the formation of a quality welded joint. Studies showed that the use of the proposed welding method in a reducing medium of carbon monoxide ensures full strength of the welded joint and the base metal.
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