Development and industrial exploitation of welding technology for heat-resistant nickel alloys for high-temperature nuclear power plants

Abstract

Heat-resistant nickel alloys are promising materials for manufacturing structural elements used in high-temperature nuclear power plants. Nickel alloys are characterized as difficult-to-weld materials; this is one of the main factors limiting their use. This paper presents the results of the development and industrial exploitation of welding technology for heat-resistant nickel alloy grade CrNi₆₂MoCh₂-VI (EC 199-VI). The quality control results of the obtained welded joints are presented. Notably, the welded joints of the CrNi₆₂MoCh₂-VI alloy exhibit resistance to intercrystalline corrosion and demonstrate improved mechanical characteristics.