Additive manufacturing is an advanced manufacturing technology that combines materials science

machanical automation and information technology. It has played an increasingly important role in the past 30 years of development. Laser metal deposition (LMD) is an additive manufacturing technology based on directed energy deposition (DED)

which has received widespread attention in recent years. The basic operation principle and system composition of LMD technology were described. The research progress and application status of LMD technology at home and abroad were mainly introduced. Some LMD-based technology development and equipment manufacturing were listed. The shortcomings of LMD technology in forming efficiency

forming precision

process stability and performance consistency were pointed out. Finally

Five development trends of LMD technology were summarized : Intensification of material system; Systematic analysis of technological parameters; Improve forming efficiency; Intelligent integrated device control

Expansion of application areas.