Abstract
The directed energy deposition (DED) processes are one of the important types of metal additive manufacturing technologies due to their capability of producing complex shaped free form parts. DED techniques can be used to deposit structures with a wide range of alloys and materials. Furthermore, DED techniques can be easily combined with different types of manufacturing process to make a hybrid metal additive manufacturing system. The research attempts on DED processes have been increased over recent years in various aspects like mechanical characterization, process parameter optimization and material feeding systems. In this chapter, different types of DED processes are briefly discussed. The chapter mainly focuses on state of the art advancements related to arc-based DED processes and aims to review research attempts made on DED processes based on process parameter selection, hardware development, mechanical characterization and thermal analysis. Finally, the advantages and disadvantages of different DED processes are categorized to bring out their strengths and limitations in depositing metallic structures.
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