• JLA Vol:8 Iss:5 (Laser drilling of advanced materials: Effects of peak power, pulse format, and wavelength)


    Authors:
    X. Chen
    W. T. Lotshaw
    A. L. Ortiz
    P. R. Staver
    C. E. Erikson
    M. H. McLaughlin
    T. J. Rockstroh



    The quality of laser‐drilled holes is significantly influenced by the laser peak power, pulse format, and wavelength. Three advanced materials are used to demonstrate the importance of choosing the correct laser parameters for a specific material. The materials are: (1) intermetallic single crystal nickel aluminide (NiAl) alloy; (2) N5, a single crystal nickel‐based superalloy; and (3) a silicon carbide (SiC) ceramic matrix composite (CMC). The laser peak power is varied in terms of the pulse...

    $25.00

  • JLA Vol:2 Iss:1 (On Laser Vibrometry of Rotating Targets: Effects of Torsional and In‐Plane Vibration)


    Authors:
    S. J. Rothberg
    J. R. Baker
    N. A. Halliwell
    ISVR, University of Southampton, Highfield, Southampton S09 5NH, England


    Vibration measurements on rotating surfaces are often referred to in the commercial literature as a major application of laser Doppler vibration transducers. This paper examines such use of these instruments and shows how the presence of a velocity component due to the rotation itself leads to spurious measurement dependence on both torsional vibration and motion perpendicular to the line of incidence of the laser beam. In addition, the scale of this dependence increases with both rotation speed and perpendicular distance between the l...

    $25.00

  • JLA Vol:24 Iss:4 (Laser-assisted nanofabrication of carbon nanostructures)


    Authors:
    Yun Shen Zhou
    Wei Xiong
    Jongbok Park
    Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0511, USA

    Min Qian
    Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588-0511, USA and Department of Physics, East China Normal University, Shanghai 200062, People’s Republic of China

    Masoud Mahjouri-Samani
    Yang Gao
    Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0511, USA

    Lan Jiang
    Department of Mechanical and Automation Engineering, Beijing Institute of Technology, Bei...

    $25.00

  • JLA Vol:5 Iss:1 (Heat Flow in Laser Die Blank Welding)


    Authors:
    Y.‐S. Yang
    C. R. Hsu
    C. E. Albright
    Y. Kuroda



    Laser welded die blanks are finding increased usage in many industrial applications. This investigation was undertaken to establish a simplified means of calculating thermal cycles experienced in the fusion and heat affected zones on laser welds typically used in die blank welding. A planar solution domain perpendicular to the direction of travel was selected to simplify the finite element calculations. The resulting calculation technique provided reasonably accurate prediction of the thermal cycles measured by Moon and Metzbower, and the size of fusion zones and heat affected zones o...

    $25.00

  • JLA Vol:15 Iss:4 (Welding of thick austenitic stainless steel using Nd:yttrium–aluminum–garnet laser with filler wire and hybrid process)


    Authors:
    Tommi Jokinen
    Miikka Karhu
    VTT Industrial Systems, P.O. Box 17021, FIN 53851 Lappeenranta, Finland

    Veli Kujanpa¨a¨
    Lappeenranta University of Technology, P.O. Box 20, FIN 53851 Lappeenranta, Finland


    Autogenous laser welding has shown many advantages over traditional welding methods in numerous applications. However, there could be even more applications, but due to the power levels of present high power lasers, depth of penetration is limited. One way to overcome this limitation is to use multipass laser welding, in which a narrow gap and a filler wire are applied. By this process thick sections can be welded with a smaller heat inpu...

    $25.00

  • JLA Vol:1 Iss:3 (CO<sub>2</sub> Laser Engraving System for Relief Plate to Print Corrugated Cardboard)


    Authors:
    K. Wakabayashi
    N. Sugishima
    NEC Corporation, Laser Equipment Div., 1120, Shimokuzawa, Sagamihara, JAPAN


    A very compact and economical CO2 laser engraving system to make relief plates for the purpose of printing corrugated cardboard has been developed. This system consists of a highly stable 500W CO2 laser and a high speed, easy handling image processing sub&hyphen;system. In this paper several new developments are described. This image processing technique for CO2 laser raster scanning and engraving has been newly developed. Every binary image is converted to the relief plate more easier than other reported engraving systems.

    $25.00

  • JLA Vol:19 Iss:4 (Experimental observation of keyhole shapes in the laser welding of aluminum blanks)


    Authors:
    B. J. Aalderink
    Netherlands Institute for Metals Research, P.O. Box 217, 7500 AE Enschede, The Netherlands

    R. G. K. M. Aarts
    University of Twente, Laboratory of Mechanical Automation, P.O. Box 217, 7500 AE Enschede, The Netherlands

    D. F. de Lange
    Netherlands Institute for Metals Research, P.O. Box 217, 7500 AE Enschede, The Netherlands

    J. Meijer
    University of Twente, Laboratory of Mechanical Automation, P.O. Box 217, 7500 AE Enschede, The Netherlands


    A camera-based in situ monitoring system for the Nd:yttrium–aluminum–garnet laser keyhole welding process of aluminium has been developed. The...

    $25.00

  • JLA Vol:22 Iss:4 (Erratum: &ldquo;Weld strength improvement for Al alloy by using laser weaving method&rdquo; [J. Laser Appl. 22(3), 116 (2010)])


    Authors:
    Kwang-Deok Choi
    Young-Nam Ahn
    Cheolhee Kim
    Advanced Welding & Joining Technology Research Team, Korea Institute of Industrial Technology, 7-47 Songdo-Dong, Yeonsu-Gu, Incheon 406-840, Korea


    $25.00

  • JLA Vol:7 Iss:2 (Fraunhofer resource center for laser technology &hyphen; USA)


    Authors:
    Frank W. Kuepper
    Fraunhofer Resource Center for Laser Technology, Ann Arbor, MI, U.S.A.


    $25.00

  • JLA Vol:14 Iss:1 (Physical&ndash;computational model to describe the interaction between a laser beam and a powder jet in laser surface processing)


    Authors:
    O. O. Diniz Neto
    Array

    R. Vilar
    Departamento de Engenharia de Materiais, Instituto Superior Te´cnico, 1049-001 Lisboa, Portugal


    Frequently laser surface treatments use a powder jet in conjunction with the laser beam. In this study we present a physical–computational model to describe the interaction between a laser beam and a powder jet. The model can be used to calculate the spatial distribution of particle temperature and laser beam attenuation at any moment and all over the region where the laser and particle beams interact. In calculating particle temperature, the attenuation of the laser beam by the particles themselves is taken into acc...

    $25.00

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