• JLA Vol:16 Iss:4 (Microstructural aspects of laser dissimilar welds of hard metals to steels)


    Authors:
    A. Costa
    IDMEC, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

    L. Quintino
    IDMEC, Av. Rovisco Pais, 1049-001 Lisboa, Portugal and Instituto Superior Te´cnico, Secc¸a˜o de Tecnologia Mecaˆnica, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

    R. M. Miranda
    IDMEC, Av. Rovisco Pais, 1049-001 Lisboa, Portugal and Universidade Aberta, R. Escola Polite´cnica 147, 1269-001 Lisboa, Portugal


    Laser beam welding has been widely used in industry in the past decade. Recently, applications in dissimilar welds involving hard metals have been investigated. Hard metals are commonly used in tool manufacturing and this application...

    $25.00

  • JLA Vol:21 Iss:1 (Local susceptibility of the retina, formation and duration of afterimages in the case of Class 1 laser products, and disability glare arising from high-brightness light emitting diodes)


    Authors:
    Hans-Dieter Reidenbach
    Cologne University of Applied Sciences, Research Laboratory on Medical Technology and Non-Ionizing Radiation, Betzdorfer Str 2, 50679 Koeln, Germany


    According to the new European Directive on Artificial Optical Radiation, the employer has to determine the exposure and the assessment of risks and in addition, he shall give particular attention to any indirect effects, such as temporary blinding, when carrying out the risk assessment. Up to now, secondary effects such as temporary blinding have not been regarded in safety standards and there exist but a few data on this topic as far as modern artificial high-brightness (HB) light sources are concerned. Te...

    $25.00

  • JLA Vol:9 Iss:6 (Scaling laws for thick‐section cutting with a chemical oxygen–iodine laser)


    Authors:
    A. Kar
    J. A. Rothenflue
    W. P. Latham



    Almost all laser‐assisted materials processing involves melting, vaporization and plasma formation which affect the utilization of laser energy for materials processing. To account for the effect of these phases, an effective absorptivity is defined, and a simple mathematical model is developed for the cutting of thick‐section stainless steel using a high power chemical oxygen—iodine laser (COIL). The model is based on an overall energy balance, and it relates the cutting depth with various process parameters that can be used to predictively scale the laser materials processing performance to ...

    $25.00

  • JLA Vol:3 Iss:3 (Safety of Medical Excimer Lasers with an Emphasis on Compressed Gases)


    Authors:
    David H. Sliney
    Laser Microwave Division, US Army Environmental Hygiene Agency, Aberdeen Proving Ground, MD 21010‐5422

    Terrance N. Clapham
    VISX, Inc., 919 Kifer Road, Santa Clara, CA 94086


    Excimer lasers which emit short ultraviolet radiation (UVR) are currently being used in experimental and developmental surgical applications. Although UVR exposure is possible, it is not normal in laser angioplasty (cardiovascular surgery) and is insignificant in photokera‐toplasty (ophthalmic surgery). However, significant potential hazards exist with the use of excimer laser gases such as fluorine and HCI. Stringent safeguards for handling and use are ...

    $25.00

  • JLA Vol:1 Iss:2 (Summary of Laser Plume Effects and Safety Session)


    Authors:
    Richard P. Felten
    Senior Chemist, Radiation Biology Branch, Center for Devices and Radiological Health, Food and Drug Administration


    $25.00

  • JLA Vol:15 Iss:1 (Microstructure and corrosion behavior of high power diode laser deposited Inconel 625 coatings)


    Authors:
    J. Tuominen
    Laser Application Laboratory, Tampere University of Technology, FIN-33101 Tampere, Finland

    P. Vuoristo
    T. Ma¨ntyla¨
    Institute of Materials Science, Tampere University of Technology, FIN-33101 Tampere, Finland

    J. Latokartano
    J. Vihinen
    Laser Application Laboratory, Tampere University of Technology, FIN-33101 Tampere, Finland

    P. H. Andersson
    Institute of Production Engineering, Tampere University of Technology, FIN-33101 Tampere, Finland


    A series of experiments were performed to investigate the one-step laser cladding of Inconel 625 powder, injected off-axially onto m...

    $25.00

  • JLA Vol:19 Iss:2 (Welding of titanium and other refractory metals with a free pulse shaping laser)


    Authors:
    Karsten Richter
    Lasag AG, Switzerland

    Uwe Reisgen
    Wilfried Behr
    Forschungszentrum Ju¨lich GmbH, Germany

    Ronald Holtz
    Lasag AG, Switzerland


    Refractory metals are used as construction materials for specific applications. Amongst the refractory metals, titanium has a special status due to its multi-faceted property profile and its comparatively low price. Titanium materials have outstanding properties, such as excellent resistance to corrosion and very high strength at low densities, which lead to their preferred use in chemical engineering and as a structural material in lightweight construction. Due to the high affin...

    $25.00

  • JLA Vol:24 Iss:2 (Laser dressing of metal bonded diamond blades for cutting of hard brittle materials)


    Authors:
    Philipp von Witzendorff
    Anas Moalem
    Rainer Kling
    Ludger Overmeyer
    Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany


    In this study, the authors investigate the laser dressing of metal bonded diamond blades by means of laser pulses with different pulse durations and wavelengths. Conventional dressing suffers from excessive blade wear, whereas laser dressing enables precise removal of the bonding metal to generate the required chip space of protruding diamond grains. The challenge for processing this composite material is to find appropriate level of ablation for the bonding metal without damaging the diamond grains thr...

    $25.00

  • JLA Vol:6 Iss:3 (Safety concerns about laser pointers)


    Authors:
    David H. Sliney
    Jerome E. Dennis



    In the past two years considerable concerns have been expressed about the safety of Class 3A laser pointers. The concern has been that Class 3A diode–laser pointers have replaced the safer helium–neon (He–Ne) Class 2 laser pointers. Hundreds of thousands of small He–Ne visible‐wavelength lasers have been traditionally used for alignment and pointing, laser demonstrations and laser displays in science, education and industry, but can the diode laser be as safe and effective? Not infrequently, some people associate “lasers” with Buck Rogers and “Star Wars”, and are concerned wh...

    $25.00

  • JLA Vol:17 Iss:4 (Faster and damage-reduced laser cutting of thick ceramics using a simultaneous prescore approach)


    Authors:
    V. Pereles-Santiago
    M. Washington
    P. Brugan
    G. Cai
    R. Akarapu
    S. Pulford
    A. E. Segall
    The Pennsylvania State University, University Park, Pennsylvania 16802


    Laser machining of structural ceramics is increasingly gaining acceptance as an alternative to traditional machining methods. However, despite the great promise of lasers for a variety of cutting and drilling procedures, premature fractures and prohibitively low cutting speeds are still among the greatest obstacles encountered, particularly when thick cross sections are involved. While many factors contribute to the fractures encountered during ...

    $25.00

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