Research progress in laser welding of Nickel-based alloy sheet

With the rapid development of aerospace, energy power, petrochemical, and other fields, nickel-based alloy sheet welding technology has become one of the key factors determining the performance of core components. The welding of nickel base alloy sheet is sensitive to the heat input, and it is easy to cause element segregation and brittle phase precipitation, which will reduce the weld performance and produce welding deformation. This paper introduces the research progress of laser welding technology of nickel base alloy sheet, and summarizes the evolution of weld microstructure, changes of mechanical properties and corrosion resistance, and the rules of welding deformation under two kinds of welding technologies including laser autogenous welding and laser welding with filler wire of nickel base alloy sheet. It is proposed that the prediction of weld microstructure should be considered in the future research, which should combine with advanced algorithms to propose the adaptive control strategy of microstructure, mechanical properties and corrosion resistance, developing a new intelligent welding process.