Effects of the Nozzle Tip Clogging and the Scanning Direction on the Deposition Process During Laser Metal Deposition of Alloy 718 Using a Four-Stream Discrete Nozzle
geometry. In these cases, the use of discrete coaxial nozzles is recommended. With this type of nozzle, the powder can clog the
internal tips of the nozzle streams due to an inappropriate shape, size distribution, humidity or temperature conditions of the powder
particles during the deposition process. This undesired effect can be an opportunity depending on the combination of the activated
powder tips for coating complex surfaces when the geometry of the substrate acts as a barrier for the powder stream.
This work presents for first time the effect of the scanning direction and the stream clogging on the deposition process in terms of
powder efficiency, Material Deposition Rate (MDR) and clad geometry and dimensions, when Alloy 718 is deposited by LMD
using a four-stream discrete coaxial nozzle,
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