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

    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...


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

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


  • JLA Vol:23 Iss:2 (Recent advances in laser surface treatment of titanium alloys)

    J. J. Candel
    V. Amigo´
    ITM Instituto de Tecnologia de Materiales, UPV, Valencia, Spain

    This paper reviews progress over the last five years in the field of laser surface modification of titanium alloys. The authors analyze the effect of new laser technologies and new materials as tools for improving surface properties—specifically, biocompatibility and resistance to wear, corrosion, and high temperatures. The authors discuss the effect of laser processing parameters on the microstructure and compare the results obtained by various researchers. Therefore, an overview of the difficulties involved in the laser processing of titanium is provided with a di...


  • JLA Vol:7 Iss:4 (Laser cutting of thick sectioned steels using gas flow impingement on the erosion front)

    P. M. Ilavarasan
    P. A. Molian
    Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, U.S.A.

    An off‐axial gas jet has been developed that has the potential to extend the laser's effectiveness by improving the rate at which parts can be machined, producing high‐quality surfaces, enhancing the cutting thickness, and adding to the range of materials that can be machined. In laser cutting, an erosion front (liquid–gas region) forms at the momentary end of the cut. Laser heating, exothermic reactions and shear force between the gas flow and the molten layer dictate the material removal rates. The principle of the off‐axi...


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

    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 ...


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

    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...


  • JLA Vol:9 Iss:6 (&hellip; .But is it really safe?)

    Peter A. Smith
    DERA Centre for Human Sciences, Farnborough, Hampshire, U.K.


  • JLA Vol:3 Iss:2 (Laser Applications in Criminalistics)

    E. R. Menzel
    Center for Forensic Studies, Department of Physics, Texas Tech University, Lubbock, Texas 79409

    Lasers find application in numerous areas of criminalistics, such as fiber analysis, document examination and serology. Their widest use, however, is in detection of latent fingerprints. Several routine procedures for obtaining laser&hyphen;excited fingerprint fluorescence on a range of surfaces have been developed. However, many surfaces fluoresce so strongly themselves that they are not amenable to these procedures. Time&hyphen;resolved luminescence imaging is being investigated to permit detection of fingerprints on such surfaces.


  • JLA Vol:17 Iss:3 (High-speed scanning laser-induced breakdown spectroscopy at 1000 Hz with single pulse evaluation for the detection of inclusions in steel)

    Holger Bette
    Reinhard Noll
    Fraunhofer-Institut fu¨r Lasertechnik (ILT), Steinbachstr. 15, 52074 Aachen, Germany

    Gregor Mu¨ller
    Hans-Werner Jansen
    C¸etin Nazikkol
    Horst Mittelsta¨dt
    ThyssenKrupp Stahl AG, Kaiser-Wilhelm-Str. 100, 47166 Duisburg, Germany

    Spatially resolved information about the distribution and chemical composition of inclusions in steel are gained by scanning methods, such as scanning electron microscopy with energy dispersive X-ray spectroscopy, electron probe microanalysis or capillary-X-ray flourescence. Scanning laser-induced breakdown spectroscopy (LIBS) offers dis...


  • JLA Vol:22 Iss:1 (Finite volume model for laser-soot interaction for a laser transmission welding process)

    L. S. Mayboudi
    A. M. Birk
    G. Zak
    Mechanical and Materials Engineering, Queen’s University, Kingston, Ontario K7L 3N6, Canada

    P. J. Bates
    Chemistry and Chemical Engineering, Royal Military College, Kingston, Ontario K7K 7B4, Canada

    Laser transmission welding, a technique to join thermoplastic components, involves a laser beam passing through a laser-transmitting part being absorbed by a laser-absorbing part at the weld interface. The heat generated at the interface melts a thin layer of the plastic in both parts and forms a joint. Laser-absorbing agents such as dyes or soot particles are added to the laser-absorbing part to...



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