TIG welding process for dissimilar steels

Abstract

Welding technologies have a very important role during the defining of technological processes for equipment installation and assembly. It is especially important in energetic plants that are working under high temperatures and pressures, aggressive conditions, corrosion, dynamically loaded constructions, etc. In many assemblies, it is necessary to weld dissimilar steels, and one of the most popular welding processes is TIG. In this paper, the TIG process of welding dissimilar steels is described: low-carbon, low-alloyed steel 10CrMo910 for high-temperature exploitation and martensitic steel with high-alloyed X10CrMoVNb91 for high-temperature exploitation, which is stainless and wear-resistant. These steels are aimed for pipelines in thermoenergetic plants, e.g., for superheater elements where exploitation conditions are high temperature and pressure.