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Träfflista för sökning "WFRF:(Tan Z.) srt2:(1995-1999)"

Sökning: WFRF:(Tan Z.) > (1995-1999)

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1.
  • Li, W-B, et al. (författare)
  • Modeling of the laser cladding process : preheating of the blown powder material
  • 1995
  • Ingår i: Lasers in engineering (Print). - 0898-1507 .- 1029-029X. ; 4:4, s. 329-341
  • Tidskriftsartikel (refereegranskat)abstract
    • Laser cladding is a high precision method of improving the wear and corrosion resistance of metal surfaces. The process gives high quality, porosity free surface layers, with low dilution of the substrate material and with excellent bonding to the substrate. Most frequently metal powder is used as cladding material and there are basically two different methods of application: i) a pre-placed bed of powder on the substrate surface; ii) powder blown into the beam-substrate interaction zone by an inert gas stream, The blown powder cladding process is much more flexible with respect to surface geometries and is therefore the most frequently used method in industry and the subject of this paper. As the blown particles travel through the laser beam on their way to the laser-substrate interaction zone they become heated. This paper gives the results of a theoretical model which investigates the level of pre heating experienced by the particles and the effects of various parameters on this pre heating. The results are important, as the powder particle temperature is expected to be an important parameter in the modelling and control of the cladding process.
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2.
  • Li, W.-B, et al. (författare)
  • Redistribution of the beam power in laser cladding by powder injection
  • 1996
  • Ingår i: Lasers in engineering (Print). - 0898-1507 .- 1029-029X. ; 5:3, s. 175-183
  • Tidskriftsartikel (refereegranskat)abstract
    • In the process of cladding by using blown powder, the laser light passes through the injected powder and is incident on the surface of the substrate. As a result of the presence of the powder cloud there will be a reduction in the laser beam irradiance experienced by the melt pool below it. This effect will be more pronounced where the cloud is at it's deepest. The original laser power density distribution will therefore be altered by passage through the powder stream. The present paper quantitatively describes this phenomenon and suggest some equations by which the redistribution of the power density of the laser beam through the powder cloud can be evaluated. The significance of the redistribution of the laser beam and its possible effect on the temperature in the substrate is also discussed.
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  • Resultat 1-2 av 2
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refereegranskat (2)
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Engström, Hans (2)
Tan, Z (2)
Powell, John (2)
Magnusson, Claes (2)
Li, W-B (2)
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Luleå tekniska universitet (2)
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Engelska (2)
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