ABSTRACT
High entropy alloys (HEAs) can be employed in rigorous environmental conditions like irradiation, high temperature, cryogenic temperature, along with room temperature, as the structural materials exhibit comparable, or sometimes superior, properties to the presently available alloy systems. Even though the structural materials like titanium-, aluminium-, and nickel-base superalloys show remarkable properties at certain working conditions, their application in various fields is limited by their weldability. Welding sometimes deteriorates the properties of a base material because of the associated changes in microstructure and composition in a narrow region. Hence, the study of the weldability of these novel high entropy alloys also become necessary before considering them for various industrial applications. Presently, structural high entropy alloys like CoCrFeNiMn and AlxCoCrFeNi HEAs have been studied for their weldability with different techniques like gas-tungsten arc welding (GTAW), laser beam welding (LBW), electron beam welding (EBW), and friction-stir welding (FSW). Hence, this chapter will review the published works on the welding of high entropy alloys and future research options available in this sector in detail.
