Design and numerical simulation of broad coaxial powder feeding nozzles for laser cladding

GUO Xiangyu; NI Mao; LIU Huaming; LEI Kaiyun; DU Fu

doi:10.7510/jgjs.issn.1001-3806.2018.03.014

LASER TECHNOLOGY > 2018 > 42(3): 362-368. > DOI: 10.7510/jgjs.issn.1001-3806.2018.03.014

GUO Xiangyu, NI Mao, LIU Huaming, LEI Kaiyun, DU Fu. Design and numerical simulation of broad coaxial powder feeding nozzles for laser cladding[J]. LASER TECHNOLOGY, 2018, 42(3): 362-368. DOI: 10.7510/jgjs.issn.1001-3806.2018.03.014

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Design and numerical simulation of broad coaxial powder feeding nozzles for laser cladding

GUO Xiangyu^1,2,
NI Mao^1,2, ,,
LIU Huaming^1,2,
LEI Kaiyun^1,2,
DU Fu³

1.
Hubei Key Laboratory of Advanced Technology of Automotive Components, Wuhan University of Technology, Wuhan 430070, China
2.
Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan 430070, China
3.
Department of Chassis, China North Vehicle Research Institute, Beijing 100072, China

More Information

Received Date: July 12, 2017
Revised Date: September 07, 2017
Published Date: May 24, 2018

Graphical Abstract

Abstract

Abstract

In order to design a coaxial powder feeding nozzle for high power broad laser cladding, powder convergence property and concentration distribution for broad laser coaxial powder feeding nozzles were analyzed at different inclination angles and exit gap of the powder feeding channel by using the discrete phase model in FLUENT software. And when other conditions were fixed, the effect of outer protective gas velocity on powder convergence was analyzed and the better structure size was obtained. The experiments of powder feeding and cladding were carried out by using the designed and developed broad coaxial powder feeding nozzle. The experimental results show that, the focal point concentration of the coaxial powder nozzle is approximately obeyed by Gaussian distribution in radial direction and axial direction. With the increase of feeding angle, the effect of exit gap on focal length becomes more and more important.The smaller the exit gap, the greater the focal length. When feeding angle is 70° and exit gap is 3.5mm, powder convergence is better and utilization ratio of powder is high.When the other conditions are constant, the fact that outer protective gas velocity is too fast or too slow is not beneficial to powder convergence. When outer protective gas velocity is slightly less than carrying gas velocity, the characteristics of powder convergence of powder feeding nozzle is the best. The quality of surface cladding reaches the expected requirement, and the rationality of the structure is verified. The designed nozzle has a great significance for the research and application of subsequent broad laser cladding.
- laser technique,
- broad coaxial powder feeding nozzle,
- discrete phase model,
- laser cladding

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References (23)

References

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