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  • JLA Vol:14 Iss:2 (Thermomechanical effects in laser microprocessing for dieless metal wire drawing)


    Authors:
    Yonggang Li
    School of Optic/CREOL (Center for Research and Education of Optics and Lasers), Mechanical, Materials and Aerospace Engineering Department, University of Central Florida, Orlando, Florida, 32816-2700

    Nathaniel R. Quick
    USF Filtration and Separations Group, Inc., 1750 Filter Drive, DeLand, Florida 32724-2045

    Aravinda Kar
    School of Optic/CREOL (Center for Research and Education of Optics and Lasers), Mechanical, Materials and Aerospace Engineering Department, University of Central Florida, Orlando, Florida, 32816-2700


    A new dieless metal fiber drawing process is developed in which a high-precision laser is used to heat the...

    $25.00

  • JLA Vol:18 Iss:3 (Thermal and microstructural aspects of the laser direct metal deposition of waspaloy)


    Authors:
    Andrew J. Pinkerton
    Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, PO Box 88, Manchester M60 1QD, United Kingdom

    Mallikarjun Karadge
    Manchester Materials Science Centre, School of Materials, The University of Manchester, Grosvenor Street, Manchester M1 7HS, United Kingdom

    Waheed Ul Haq Syed
    Lin Li
    Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, PO Box 88, Manchester M60 1QD, United Kingdom


    A potential problem in applying the laser direct metal deposition (LDMD) technique to the f...

    $25.00

  • JLA Vol:1 Iss:1 (High‐Speed Laser Welding Discontinuities)


    Authors:
    Charles E. Albright
    Shichan Chiang
    Department of Welding Engineering, Ohio State University, Columbus, Ohio


    $25.00

  • JLA Vol:24 Iss:2 (Energetic efficiency of remote cutting in comparison to conventional fusion cutting)


    Authors:
    M. Lu¨tke
    J. Hauptmann
    A. Wetzig
    Fraunhofer IWS, Winterbergstraße 28, 01277 Dresden, Germany

    E. Beyer
    Fraunhofer IWS, Winterbergstraße 28, 01277 Dresden, Germany and University of Technology Dresden, 01062 Dresden, Germany


    The remote cutting technique provides an enormous potential in terms of cutting speeds when working on thin sheets. Even on contour cutting speeds about 100 m/min are realizable. Working without any cutting gas, the material of the cutting kerf must be vaporized partially. It is evident that the energy input must be higher than for pure melting of the cutting kerf’s material. In order to ...

    $25.00

  • JLA Vol:6 Iss:4 (Hazardous chemicals produced by laser materials processing)


    Authors:
    John M. Kokosa
    GMI Engineering & Management Institute, Flint, MI, U.S.A.


    Despite evidence to the contrary, until recently many laser operators believed, or at least stated, that the only chemical by‐products of laser processing of any consequence were water and CO2. During the last eight years, especially, several investigations have shown that hazardous materials are produced when cutting or welding nearly all substrates. In the following paper, the major chemical hazards associated with processing metals, inorganics, biomaterials, and polymers are outlined.

    $25.00

  • JLA Vol:16 Iss:4 (Dimensional and material characteristics of direct deposited H13 tool steel by CO<sub>2</sub> laser)


    Authors:
    J. Choi
    Y. Hua
    Department of Mechanical and Aerospace Engineering and Engineering Mechanics, University of Missouri, Rolla, Missouri 65409-1060


    Laser aided direct metal/material deposition process builds metal parts layer-by-layer directly from the computer aided design representation. Success of this technology in the die and tool industry depends on the parts quality to be achieved. To get designed geometric dimensions and material properties, delicate control of the process variables such as laser power, spot diameter, traverse speed, and powder mass flow rate is critical. With a closed loop optical height control system, the dimensional accuracy was achieved ...

    $25.00

  • JLA Vol:21 Iss:2 (Corrosion performance and restoration of laser-formed metallic alloy sheets)


    Authors:
    Z. Liu
    C. Guzma´n
    H. Liu
    A. Anacleto
    T. Francisco
    M. Abdoalshafie
    L. Ma
    O. Abodunrin
    P. Skeldon



    Previous studies of laser forming have been focused on understanding the laser forming mechanisms, investigating the effects of important laser process parameters on deformed shape, and modeling the forming process. Although microstructures and mechanical properties have received some attention, no work has addressed corrosion behavior of laser-formed components. However, laser forming is a thermal process with substantial thermal cycles required; sensitization of microstr...

    $25.00

  • JLA Vol:8 Iss:4 (Acoustic emission from modulated laser beam welding of materials)


    Authors:
    Hongping Gu
    W. W. Duley
    Guelph&hyphen;Waterloo Program for Graduate Work in Physics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1


    Acoustic emission during the laser welding of metals with a modulated CO2 laser beam has been investigated. Sharp resonances at many frequencies in the acoustic emission spectra have been observed. This was most noticeable when the average laser power was high enough to produce full penetration welds whose acoustic emission at high harmonics with frequencies that overlap with bands of vibrational frequencies corresponding to eigenmodes of the keyhole are greatly enhanced. Lower harmonics were not clearly observe...

    $25.00

  • JLA Vol:2 Iss:2 (Infrared Optical Fibers for Surgical Applications)


    Authors:
    R. W. Waynant
    M. N. Ediger
    M. Fink
    Center for Devices and Radiological Health, Food and Drug Administration, 5600 Fishers Lane, Rockville, MD 20857


    The basic characteristics of fibers that are appropriate for surgical use in the infrared are reviewed. New fiber materials, such as sapphire, fluorozirconate and chalcogenide glasses, and polycrystalline fibers are discussed as well as their applicability for surgical procedures.

    $25.00

  • JLA Vol:15 Iss:1 (Deposition of WC/Ni clad layers with a pulsed Nd:YAG laser)


    Authors:
    M. Brandt
    Industrial Research Institute Swinburne, Swinburne University of Technology, Melbourne Vic 3122, Australia

    S. W. Huang
    M. Samandi
    Department of Materials Engineering, Surface Engineering Research Centre (SERC), University of Wollongong, NSW 2522, Australia


    A series of experiments was performed to investigate the production of WC/Ni clad layers on H13 tool steel using a pulsed Nd:YAG laser and optical fibers. The effects of laser parameters, such as laser pulse energy and pulse frequency as well as material parameters such as powder composition and shape on the clad layer geometry and microstructure, were investigated. The microstru...

    $25.00

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