• JLA Vol:14 Iss:4 (The development and characteristics of a hand-held high power diode laser-based industrial tile grout removal and single-stage sealing system)


    Authors:
    J. Lawrence
    Manufacturing Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University (NTU), Nanyang Avenue, Singapore 639798

    K. Minami
    M. J. J. Schmidt
    L. Li
    Laser Processing Research Centre, Manufacturing Division, Department of Mechanical Engineering, University of Manchester Institute of Science and Technology (UMIST), Manchester M60 1QD, United Kingdom

    R. E. Edwards
    A. W. Gale
    Department of Civil and Construction Engineering, University of Manchester Institute of Science and Technology (UMIST), Manchester M60 1QD, United Kingdom


    As the field of l...

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  • JLA Vol:14 Iss:4 (Use of carbon dioxide (CO<sub>2</sub>) laser radiation in exposure of implants (stage II): A metallography evaluation in dogs)


    Authors:
    Ma´rcia Vieira Marcondes Guimara˜es
    Post Doctor Research Fellow, Department of Prosthesis, Sao Paulo State University–UNESP, School of Dentistry, Sao Jose dos Campos-SP, Brazil

    Walter Niccoli-Filho
    Head of Academic Group of Studies and Research with Laser in Dentistry, Sao Paulo State University–UNESP, School of Dentistry, Sao Jose dos Campos-SP, Brazil

    Marco Antonio Bottino
    Department of Prosthesis, Sao Paulo State University–UNESP, School of Dentistry, Sao Jose dos Campos-SP, Brazil

    Carlos Schwab
    Department of Physics at Advanced Studies Institute–IEAv, Lasers Division, Sao Jose dos Campos-S...

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  • JLA Vol:14 Iss:4 (Visible and invisible laser radiation&mdash;problems in laser safety terminology)


    Authors:
    David H. Sliney
    U.S. Army Center for Health Promotion and Preventive Medicine, Aberdeen Proving Grounds, Maryland 21010

    David J. Lund
    U.S. Army Medical Research Detachment, Brooks Air Force Base, Texas 78235

    Wesley J. Marshall
    U.S. Army Center for Health Promotion and Prevention Medicine, Aberdeen Proving Grounds, Maryland 21010


    The spectral band between 400 and 700 nm is termed “visible” in laser safety standards, this is not the full extent of the visible spectrum. Light, or visible radiation, is that which is perceived by the human eye, and the spectral bandwidth for vision is really larger, extending into what some r...

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  • JLA Vol:15 Iss:1 (Condition monitoring of laser systems: Monitoring the cover slide)


    Authors:
    H. K. To¨nshoff
    A. Ostendorf
    V. Kral
    Laser Zentrum Hannover, Hollerithalle 8, 30419 Hannover, Germany


    Laser systems are high investment production machines that require a high level of availability in order to be amortized. Laser condition monitoring methods can be used to avoid breakdowns and maintain a consistent quality. In particular elements such as the cover slide, which protect the focusing optics from getting splashed through the welding process, need to be monitored. The effects of dirt on the cover slide are detrimental to the beam quality reaching the workpiece and can cause a spontaneous failure of the cover slide. By using a laser ba...

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  • 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...

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  • JLA Vol:15 Iss:1 (Direct write of resistive lines on SiC)


    Authors:
    T. Y. Plew
    K. H. Leong
    Array

    J. M. Redwing
    Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802


    The optimal parameters of a nanosecond pulsed laser for writing of tracks of controlled resistance onto high resistivity silicon carbide were investigated. A controlled energy deposition approach was carried out to minimize changes to the surface topography. The effect of fluence and irradiance on the ability to write narrow lines with controlled resistance were the explored parameters. Two focal length lenses and a large range of fluences were chosen to determine the best paramete...

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  • 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...

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  • JLA Vol:15 Iss:1 (Effect of wire feed position on laser welding with filler wire)


    Authors:
    A. S. Salminen
    V. P. Kujanpa¨a¨
    Lappeenranta University of Technology, Laser Processing Centre, Tuotantokatur 2, FIN 53850 Lappeenranta, Finland


    The utilization of the laser welding process with filler wire addition is often considered a complicated and difficult process which has too high accuracy demands for a work shop floor. This study shows the effect of some of the most important welding variables to the quality and efficiency of laser welding when welding with filler wire. The material used was a common structural steel St52/37 of 6 mm in thickness. The joint type used was a butt joint. Acceptable weld quality was achieved with most of the tested p...

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  • JLA Vol:15 Iss:1 (Laser penetration spike welding: A microlaser welding technique enabling novel product designs and constructions)


    Authors:
    D. K. Dijken
    W. Hoving
    Centre for Industrial Technology, CFT, Philips Electronics Nederland BV, Glaslaan 2, P.O. Box 218, 5600 MD Eindhoven, The Netherlands

    J. Th. M. De Hosson
    Department of Applied Physics, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands


    A novel method for laser penetration microspot welding of sheet metal is presented. With this so called “laser spike-welding,” large gap tolerances are allowed. Depending on the ratio of laser spot radius to top plate thickness, gaps of 100% of the top layer thickness and more can be bridged. With conventional keyhole penetrati...

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  • JLA Vol:15 Iss:1 (Laser welding closed-loop power control)


    Authors:
    Claus Bagger
    Flemming O. Olsen
    Manufacturing Engineering and Management, Materials and Process Technology, Technical University of Denmark, Building 425, DK-2800 Lyngby, Denmark


    A closed-loop control system is developed to maintain an even seam width on the root side of a laser weld by continually controlling the output laser power of a 1500 W CO2 laser. Quality control is done by a photodiode monitoring the root-side light emission from the process. The control system is successfully demonstrated to work in the bead-on-plate configuration on 2 mm sheets, both at constant speeds and at speeds ranging from 0.32 to more than 0.72 m/min in one welding tri...

    $28.00

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