Review on microstructure and properties of joints welded by using high-energy beam

Due to the advantages of small deformation, high energy density and welding efficiency, the high-energy beam welding technology has played an important role in aerospace, rail transportation and other advanced manufacturing fields. The existing study shows that the high-energy beam welding could realize high-quality joining of similar/dissimilar materials, such as superalloy, titanium alloy, high-entropy alloy, aluminum alloy and others. The development and physical process of two representative technologies, electron beam welding and laser welding, are briefly introduced. The study on the microstructure feature and mechanical property as well as the effect of the post-weld heat treatment for the two processes are mainly discussed.