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


    Authors:
    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...

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


    Authors:
    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...

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  • JLA Vol:17 Iss:4 (Temperature distributions due to annular laser beam heating)


    Authors:
    D. Zeng
    Laser-Aided Manufacturing, Materials and Micro-Processing (LAMMMP) Laboratory, College of Optics and Photonics, Center for Research and Education in Optics and Lasers (CREOL), Mechanical, Materials and Aerospace Engineering Department, University of Central Florida, Orlando, Florida 32816-2700

    W. P. Latham
    Air Force Research Laboratory, Directed Energy Directorate, 3550 Aberdeen, Avenue SE, Kirtland Air Force Base, New Mexico 87117-5776

    A. Kar
    Laser-Aided Manufacturing, Materials and Micro-Processing (LAMMMP) Laboratory, College of Optics and Photonics, Center for Research and Education in Optics and Lasers (CREOL), Mechanical, Materials and ...

    $25.00

  • JLA Vol:22 Iss:2 (Studies on characteristics of CO<sub>2</sub> laser-GTAW hybrid welding of austenitic stainless steel)


    Authors:
    Rakesh Kaul
    Harish Kumar
    B. T. Rao
    L. M. Kukreja
    Laser Material Processing Division, Raja Ramanna Centre for Advanced Technology, P.O. CAT, Indore 452 013, India

    Nageshwar Singh
    H. S. Vora
    Laser System Engineering Division, Raja Ramanna Centre for Advanced Technology, P.O. CAT, Indore 452 013, India


    The present paper describes an experimental hybrid welding study, involving CO2 laser and gas tungsten arc welding, on 6 mm thick austenitic stainless steel sheet. The study focused on real-time plasma monitoring during welding and metallographic examination of the resultant weldments. Coupling of...

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  • JLA Vol:25 Iss:3 (The effect of fit-up geometry on melt flow and weld quality in laser hybrid welding)


    Authors:
    J. Lamas
    Centro Tecnolo´xico do Naval Galego, Ferrol 15590 (A Corun˜a), Spain and Department of TVM, Luleå University of Technology, S-971 87 Luleå, Sweden

    J. Karlsson
    P. Norman
    J. Powell
    A. F. H. Kaplan
    Department of TVM, Luleå University of Technology, S-971 87 Luleå, Sweden

    A. Yan˜ez
    Centro de Investigacio´ns Tecnolo´xicas, Universidade da Corun˜a, Ferrol 15403 (A Corun˜a), Spain


    Hybrid laser-arc welding has a good tolerance to poor fit up as compared to simple laser welding. For a butt joint, the joint fit-up variations can b...

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


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


    $25.00

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


    Authors:
    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.

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  • JLA Vol:16 Iss:1 (Laser-assisted chemical cleaning for oxide-scale removal from carbon steel surfaces)


    Authors:
    Hyunkyu Lim
    Dongsik Kim
    Department of Mechanical Engineering, POSTECH, Pohang 790-784, Korea


    The article introduces a novel laser chemical processing technique for removing thin oxide layers on low-carbon steel surfaces by combining laser-induced shock waves and the chemical cleaning technique that is currently utilized in the conventional oxide-scale removal. A Q-switched Nd:yttritium–aluminum–garnet laser (wavelength 1064 nm, full width at half maximum 6 ns) induces optical breakdown in the acid solution, producing intense pressure waves which act as a noncontact scale breaker. It has been demonstrated that the novel process leads to substa...

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  • JLA Vol:20 Iss:2 (<em>In vivo</em> and <em>in vitro</em> evaluation of the corneal damage induced by 1573&ensp;nm laser radiation)


    Authors:
    Daniel Courant
    Catherine Chapel
    Ce´line Billy
    Service de Radiobiologie et d’Oncologie, IRCM-DSV, Commissariat à l’Energie Atomique, BP 6, Fontenay aux roses, 92265, France

    Nicole Salès
    Service d’Immuno-Virologie, IMETI-DSV, Commissariat à l’Energie Atomique, BP 6, Fontenay aux roses, 92265, France

    Jean-Claude Pe´rot
    Christophe Pothier
    Lasers Optique et Thermique, CEP, Direction des Centres d’Essai et d’Expertise, 16bis avenue Prieur de la Cŏte d’Or, 94114, Arcueil, France


    This study involved the corneal effects of t...

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  • JLA Vol:14 Iss:2 (An investigation of rapid prototyping of sand casting molds by selective laser sintering)


    Authors:
    G. Casalino
    L. A. C. De Filippis
    A. D. Ludovico
    L. Tricarico
    Dipartimento di Ingegneria Meccanica e Gestionale, Politecnico di Bari, 70126 Bari, Italy


    Among the layer fabrication techniques, selective laser sintering (SLS), is widely used for manufacturing various products made of different materials (i.e., polycarbonates, nylons, polyamides, sand casting, metal powders, and others). The SLS of precoated foundry sands allows the aggregation of adjacent particles, which are then cemented by furnace heat treatment. Moreover, geometrically complex molds and cores not obtainable with conventional methods can be realized by this method. In th...

    $25.00

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