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  • JLA Vol:21 Iss:1 (Visualization of events inside kerfs during laser cutting of fusible metal)


    Authors:
    Peter Yudin
    Oleg Kovalev
    Khristianovich Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, Russia


    The subject of the research is mechanism of melt removal and striated roughness generation. Being the main obstacle limiting laser cutting process performance, these phenomena are widely discussed. Available theoretical descriptions are not conclusive, as they have nothing to be verified with. High temperatures and narrowness of the kerf severely limit visual access at a real facility. Observation will become possible if one wall of the kerf is made of glass. This possibility is utilized in present experiments, which reproduce the process at low tem...

    $25.00

  • JLA Vol:1 Iss:2 (A Study in Surface Alloying of Titanium Alloys)


    Authors:
    A. Bharti
    R. Sivakumar
    Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad‐500 258, India

    D. B. Goel
    Department of Metallurgical Engineering, University of Roorkee, Roorkee‐247 667, India


    A 5 KW CW CO2 laser has been used to alloy the surface of Ti6Al4V alloy with carbon. As a result the average microhardness was increased from 365 to 600 kg/mm.2 Compositional inhomogeneity was observed on the alloyed surface, however the compositional inhomogeneity index reduced considerably by cross scanning with defocused laser beam. Surface roughness of the alloyed surface was also studied and the roughn...

    $25.00

  • JLA Vol:8 Iss:5 (Diode‐pumped Nd:YAG laser for precision laser machining)


    Authors:
    Jason Machan
    Marcy Valley
    Gerry Holleman
    Marc Mitchell
    Dave Burchman
    Jim Zamel
    George Harpole
    Hagop Injeyan
    Len Marabella
    TRW R1/1184, One Space Park, Redondo Beach, CA 90278, U.S.A.


    Results are presented on a high power, diode‐pumped, pulsed Nd:YAG laser for precision laser machining. The laser is an unstable resonator with a graded reflectivity outcoupler, generating a beam with excellent beam quality. The gain medium is a single zig‐zag slab, pumped symmetrically by diode arrays. The use of diode arrays minimizes the thermal loading on the slab, and the zig...

    $25.00

  • JLA Vol:2 Iss:1 (The Energy Transfer Efficiency in Laser Welding Process)


    Authors:
    T. H. Kim
    Charles E. Albright
    Schichan Chiang
    Department of Welding Engineering, The Ohio State University, 190 W. 19th Ave., Columbus, Ohio 43210


    The process efficiency of laser beam welding was measured as a function of travel speed. Temperature measurements were carried out during the bead‐on‐plate laser welding of mild steel with a focused 2KW CO2 laser beam at various welding travel speeds. The laser welding process efficiency (power delivered to work/power in the beam) was calculated from the ratio of the heat content of the welded the specimen to the available laser beam energy (power × time). In the deep penetr...

    $25.00

  • JLA Vol:15 Iss:1 (Dual laser beam modification of high alumina ceramics)


    Authors:
    D. Triantafyllidis
    Array

    J. R. Bernstein
    Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom

    L. Li
    Department of Mechanical, Aerospace and Manufacturing Engineering, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom

    F. H. Stott
    Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom


    Alumina-based refractory materials are extensively used in high-temperature applications, such as linings in waste incinerators. A sign...

    $25.00

  • JLA Vol:19 Iss:2 (Femtosecond laser microstructuring of hot-isostatically pressed zirconia ceramic)


    Authors:
    Niko Ba¨rsch
    Laser Zentrum Hannover, Hollerithallee 8, 30419 Hannover, Germany

    Kristian Werelius
    Department of Prosthodontics, Johann Wolfgang Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt/Main, Germany

    Stephan Barcikowski
    Fernando Liebana
    Uwe Stute
    Andreas Ostendorf
    Laser Zentrum Hannover, Hollerithallee 8, 30419 Hannover, Germany


    Densely sintered zirconia ceramics—especially hot-isostatically pressed forms of zirconia ceramics like hot-isostatically pressed yttria-stabilized tetragonal zirconia polycrystal (HIP Y-TZP)—have the potential of superseding conve...

    $25.00

  • JLA Vol:24 Iss:4 (Structural study of near-field ablation close to plasmon-resonant nanotriangles)


    Authors:
    Andreas Kolloch
    Paul Leiderer
    Department of Physics, University of Konstanz, Universita¨tsstr. 10, D-78457 Konstanz, Germany

    Shyjumon Ibrahimkutty
    Daniel Issenmann
    Anton Plech
    Institute for Synchrotron Radiation, Karlsruhe Institute of Technology, Postfach 3640, D-76021 Karlsruhe, Germany


    The optical near fields in close vicinity to plasmonic nanoscale objects show a considerable enhancement of the electrical field and are localized to dimensions much less than the wavelength of light. The authors show that an ablation process caused by the near-field enhancement of femtosecond laser pulses pattern the substrate...

    $25.00

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  • JLA Vol:17 Iss:4 (Effect of steel composition on the laser cutting behavior of 25-mm-thick plates)


    Authors:
    M. Manohar
    R. L. Bodnar
    Mittal Steel USA R&D, Bethlehem, Pennsylvania

    R. I. Asfahani
    U.S. Steel Research and Technology Center, Monroeville, Pennsylvania

    N. Chen
    C. Huang
    Caterpillar Technical Center, Peoria, Illinois


    Attempts were made to gain a better understanding of the effects of steel composition and thermophysical properties, such as solidus and liquidus temperatures, heat of oxidation, surface tension, viscosity and thermal conductivity, on laser-cutting behavior. Laboratory-produced heats containing varying levels of C, S, Si, Cu, Ni, Cr, and Mo were hot-rolled to 32-mm-thick plates. Laser cutt...

    $25.00

  • JLA Vol:22 Iss:1 (Surface effects of alumina ceramics machined with femtosecond lasers)


    Authors:
    J. Meeker
    A. E. Segall
    V. V. Semak
    Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802


    Laser machining is now an accepted method for shaping and modifying ceramics and is rapidly replacing other methods such as grinding and etching. In fact, new innovations such as short pulsed or femtosecond lasers have drastically decreased the amount of unwanted damage associated with laser machining. However, laser machining does still alter the surface and can change the flaw populations and the strength. In order to investigate this effect, the flaw populations and strengths of both unaltered and femtosecond...

    $25.00

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