Use of a Reductive Carbon Monoxide Atmosphere in Arc Welding of Microalloyed Steels
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.
Dr. Denis Solovev
E.A. Ivanaysky et al., "Use of a Reductive Carbon Monoxide Atmosphere in Arc Welding of Microalloyed Steels", Materials Science Forum, Vol. 945, pp. 543-548, 2019