研究目的
Investigation of the influence different technological parameters at powder efficiency for laser metal deposition.
研究成果
Powder jet with inner diameter 1.4 mm and length 60 mm provide the highest powder efficiency for discrete powder nozzle. Interaction of gas-powder streams causes a decrease of powder efficiency. Shield gas using doesn’t affect powder efficiency of discrete powder nozzle.
研究不足
The design of the powder feeder used for measurement doesn’t allow setting the nominal powder rate by a specific number, only as a percentage. This requires additional calculation to determine the nominal powder rate.
1：Experimental Design and Method Selection:
The experimental research was completed to investigate the influence of powder jet geometry, powder streams interaction, and shield gas on powder efficiency. A prototype of a discrete powder nozzle was designed.
2：Sample Selection and Data Sources:
Powder jets with various inner diameters and lengths were tested.
3：List of Experimental Equipment and Materials:
Powder feeder, electric scales, beaker, diaphragm, and various powder jets.
4：Experimental Procedures and Operational Workflow:
Powder efficiency was measured by feeding powder through the powder jet into a diaphragm aperture, collecting the powder in a beaker, and comparing the mass of collected powder to the mass supplied by the powder feeder.
5：Data Analysis Methods:
Powder efficiency was calculated using the relation of powder mass from the beaker to the powder mass supplied from the powder feeder.
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