Analysis of powder stream motive behavior in laser cladding based on images
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1.
Computer Center, Tianjin Polytechnic University, Tianjin 300160, China;
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2.
Department of Auto Engineering, Military Traffic Academy, Tianjin 300161, China
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Received Date:
2009-05-05
Accepted Date:
2009-05-26
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Abstract
In order to study the effect of powder feed parameters on the motive behavior of coaxial carrier-gas powder in laser cladding process,a digital particle image velocimetry(DPIV)test device was constructed,a special image processing software was designed for this system.Lots of tests were performed on powder transport with carrying gas.The precision of velocity vector map of the powder particles in the coaxial was determined,and distribution of powder concentration at longitudinal axis from the nozzle exit was measured with the varied powder feed rate parameters by means of DPIV.Experiments show that the velocity metal-powder particle is linear with the powder mass flow rate.The powder concentration hardly changes with various gas fluxes and constant feeding powder amount.Outside the powder mass flow rate range(0.33g/s～0.83g/s),the effect is lessened obviously.Because of the nozzle configuration of powder feed unit,powder flow has phenomena of expansion,focus and reexpansion along the nozzle exit.The focus distance and powder stream radius at the focus point also increase and locus depth decreases with increasing the gas flux.
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References
|
[1]
|
HU Q W,YANG T P,LI P,et al.Fabrication and affecting of metallic parts by means of laser freeforming[J].Laser Technology,2007,31(4):403-405(in Chinese). |
|
[2]
|
LI P.Direct laser fabrication of 3-D metal parts based on laser cladding[D].Wuhan:Huazhong University of Science & Technology,2005:60-90(in Chinese). |
|
[3]
|
SHEN X F,WANG Y,YAO J,et al.Finite element simulation of thermal stress distribution in direct metal laser sintering[J].Laser Technology,2005,29(4):343-346 (in Chinese). |
|
[4]
|
LIU Zh X,HUANG W D,WAN B T.Investigation of basic problems of the numerical model for powder-feed laser cladding[J].Chinese Journal of Lasers,2003,30(6):567-570(in Chinese). |
|
[5]
|
LIN J M.Laser attenuation of the focused powder streams in coaxial laser cladding[J].Journal of Laser Application,2000,12(1):28-33. |
|
[6]
|
XI M Zh,YU G,ZHANG Y Zh,et al.Interaction of the laser beam and the metal powder conveyed by coaxial powder feeder[J].Chinese Journal of Lasers,2005,32(4):562-566(in Chinese). |
|
[7]
|
YANG X Ch,LI H Sh,LEI J B,et al.DPIV method of measurement of powder stream of co-axial feeding for laser manufacturing[J].Proc SPIE,2005,5629:93-102. |
|
[8]
|
LI H Sh,YANG X Ch,LEI J B,et al.A numerical simulation of movement powder flow and development of the carrier-gas powder feeder for laser repairing[J].Proc SPIE,2005,5629:557-564. |
|
[9]
|
YANG X Ch,LEI J B,LIU Y W,et al.Experimental measurement of metal powder stream concentration field in laser manufacturing[J].Chinese Journal of Lasers,2006,33(7):993-997(in Chinese). |
|
[10]
|
JIN X Sh,YANG X Ch,FENG L W,et al.Numerical simulation of coaxial powder flow with carrying gas in laser manufacturing[J].Chinese Journal of Mechanical Engineering,2007,43(5):161-166(in Chinese). |
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