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Sökning: WFRF:(Powell John) > Konferensbidrag

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  • Al-Mashikhi, S.O., et al. (författare)
  • An explanation of ‘striation free' cutting of mild steel by fibre laser
  • 2009
  • Ingår i: Lasers in manufacturing 2009. - Stuttgart : AT-Fachverlag.
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents the results of an experimental and theoretical investigation into the phenomenon of ‘striation free cutting', which is a feature of fibre laser cutting of thin section mild steel. The paper concludes that the creation of very low roughness edges is related to an optimisation of the cut front geometry when the cut front is inclined at angles close to the Brewster angle for the laser - material combination. For purely geometric reasons this particular type of cut front optimisation is not possible for CO2 laser cutting of mild steel.
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  • Andersson, Roger, et al. (författare)
  • Formability behaviour of meta-stable stainless steels
  • 2005
  • Ingår i: Proceedings of the 8th ESAFORM Conference on Material Forming. - Bucharest : The Romanian Academy Publishing House. - 9732711736 ; , s. 359-362
  • Konferensbidrag (refereegranskat)
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  • Bergström, David, et al. (författare)
  • Nd:YAG laser absorptance of rough metal surfaces
  • 2007
  • Ingår i: Congress proceedings. - Orlando, Fla : Laser institute of America. - 9780912035888
  • Konferensbidrag (refereegranskat)abstract
    • The Nd:YLF/Nd:YAG laser absorptance of rough metal surfaces has been investigated using 3D ray tracing simulations on computer-generated Gaussian random rough metal surfaces. The impact of multiple scattering, shadowing and Fresnel-equation based angle dependence on the overall absorption is discussed
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  • Bergström, David, et al. (författare)
  • The absorptance of metal surfaces to Nd:YAG/Nd:YLF laser light
  • 2008
  • Ingår i: Conference proceedings. - Orlando, Fla. : Laser institute of America. - 9780912035895 ; , s. 375-380
  • Konferensbidrag (refereegranskat)abstract
    • The absorptance of real metallic engineering surfaces used in Laser Material Processing depends strongly upon the particular surface conditions, including the degree of roughness and oxidation. In this paper the influence of surface topography on Nd:YAG/Nd:YLF laser absorptance has been studied, both experimentally and theoretically, on a set of randomly selected as-received metallic engineering surfaces. The surfaces were sputter-coated with a thin layer of gold to eliminate differences in surface chemistry and oxidation. The absorptance was measured using integrating sphere reflectometry and compared to calculations from 3D ray-tracing simulations of AFM-scanned images of the surfaces. The results have increased the understanding of how surface roughness influences the laser-workpiece coupling efficiency.
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  • Resultat 1-10 av 64

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