| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 734934 | Optics and Lasers in Engineering | 2012 | 8 Pages |
A photographic system for the powder feed process of laser solid forming (LSF) was developed using a high speed camera, and the powder feed behaviors (the particle speed and the powder flow concentration) were described based on the powder flow images. The influences of the powder feed parameters and the distance below the nozzle exit plane on the powder feed behaviors were discussed, and the influences of the powder feed behaviors on the deposited layer quality were also investigated. It can be seen that the smooth finish of the deposited layer surface was improved remarkably by increasing the particle speed, and the deposited layer height decreases with the increase of the particle speed. It can also be found that the variation of the deposited layer height with the increase of the distance between the deposited surface and the nozzle exit plane is similar to that of the powder mass concentrations on the vertical symmetry axis.
► A photography system of the powder feed process was developed to measure the powder feed behaviors of coaxial nozzle. ► The influences of the powder feed parameters on the particle speed and the powder flow concentration were investigated. ► The influences of the powder feed behaviors on the deposited layer quality were also investigated. ► The smooth finish of the deposited layer surface was improved remarkably by increasing the particle speed. ► The deposited layer height decreases with the increase of the particle speed.
