• JLA Vol:17 Iss:3 (Experimental study of CO<sub>2</sub> laser welding inside a groove&mdash; Application to high thickness laser welding)


    Authors:
    M. Hamadou
    R. Fabbro
    F. Coste
    S. Slimani
    GIP GERAILP/LALP (CNRS) 16 bis, Av. Prieur de la Coˆte d’Or 94114 Arcueil, France


    Laser welding inside a groove has to be considered when a high thickness material is welded. The use of a groove shape allows the access of the laser beam to the lower part of the groove. The choice of the groove geometry (groove width, depth, or aperture angle), as well as the assist gas setup (leading, trailing or backside protection) are then significant operating parameters for the process control. In this study, U- and V-shaped groove welding with a CO2 laser was investigated. The U-shaped ...

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  • JLA Vol:22 Iss:1 (Laser roll welding of dissimilar metal joint of zinc coated steel to aluminum alloy)


    Authors:
    Hitoshi Ozaki
    Muneharu Kutsuna
    Graduate School of Engineering, Nagoya University, 1, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

    Shigeyuki Nakagawa
    Kenji Miyamoto
    Research Center, Nissan Motor Co., Ltd., 1, Natsushima-cho, Yokosuka-shi, Kanagawa 237-8523, Japan


    There is a subject to reduce the weight of car body by replacing steel to aluminum alloys as some structural body parts for improving fuel consumption and suppressing CO2 generation. As one of the solutions, the hybrid body structure concept using aluminum alloys and high strength steels is proposed recently. However, it is well known that fusion welding of st...

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  • JLA Vol:8 Iss:4 (Some aspects of laser heating of engineering materials)


    Authors:
    B. S. Yilbas
    A. Z. Al&hyphen;Garni
    Mechanical Eng. Dept., KFUPM, P.O. Box 1913, Dhahran, Saudi Arabia


    Laser induced heating processes are important when a laser is used as a machine tool in industry, since the quality of the machining process strongly depends on the heating mechanism. The present study examines a heat transfer model that provides useful information on the laser induced interaction mechanism. Steady state and time dependent heating models are introduced and temperature profiles inside the materials are predicted. Using appropriate assumptions, the time for the surface temperature to reach 90&percnt; of its steady state value is estimated. To valid...

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  • JLA Vol:2 Iss:2 (Laser Induced Photochromic Flow Visualization)


    Authors:
    Thomas McWaid
    Ekkehard Marschall
    Department of Mechanical Engineering, University of California, Santa Barbara, CA 93106


    The photochromic flow visualization technique has been utilized to study several different liquid flows. The technique utilizes radiachromic dyes that can be dissolved in a number of liquids. The resulting dye&hyphen;solvent solutions remain colorless in the absence of ultraviolet radiation; however, the solutions turn dark blue when exposed to ultraviolet light. A nitrogen pulse laser has been constructed for use as source of ultraviolet radiation. When sharply focused, the emitted beam of ultraviolet light produces a very narrow, well define...

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  • JLA Vol:15 Iss:4 (Design and performance of multilevel phase fan-out diffractive optical elements for laser materials processing)


    Authors:
    Keiji Fuse
    Takayuki Hirai
    Toshihiko Ushiro
    Takeshi Okada
    Kenichi Kurisu
    Keiji Ebata
    Itami R&D Laboratories, Sumitomo Electric Industries, Ltd., 1-1-3 Shimaya, Konohana-ku, Osaka 554-0024, Japan


    A multilevel phase fan-out diffractive optical element (DOE) has been developed and introduced into various kinds of laser materials processing such as drilling, cutting, welding, and soldering. The larger the number of arrayed spots the DOE generates on the surface of the workpiece, the more sensitive the intensity uniformity of the spots becomes to fabrication errors, which are deviations between designed and fabric...

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  • JLA Vol:20 Iss:1 (Optimization of production rate in diode laser hardening)


    Authors:
    Edoardo Capello
    Barbara Previtali
    Dipartimento di Meccanica, Politecnico di Milano, Via Bonardi 9, 20133 Milano, Italy


    The present paper is a contribution to the definition of optimal laser hardening conditions with production rate as the main goal. When the part to be treated is given, the optimization problem can be expressed in terms of minimal execution time subjected to two constraints: the depth of treatment and hardness of transformed layer. When the analytical expression of the objective function and the constraints was determined, the feasibility area was described and analyzed. Finally, an optimization algorithm was applied to identify the optimal solut...

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  • JLA Vol:24 Iss:4 (Direct laser writing-mediated generation of standardized topographies for dental implant surface optimization)


    Authors:
    Rainer Wittig
    Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, Germany

    Erik Waller
    Georg von Freymann
    Arbeitsgruppe Optische Technologien und Photonik und Forschungszentrum OPTIMAS, Fachbereich Physik, Technische Universita¨t Kaiserslautern, 67663 Kaiserslautern, Germany

    Rudolf Steiner
    Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, Germany


    The functionalization of dental implants, aiming at the improvement of long-term acceptance, is of pivotal interest in dental research. Bone, connectiv...

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  • JLA Vol:5 Iss:1 (Tutorial Guide: Laser Measurement Techniques Guide For Hazard Evaluation. Part 1)


    Authors:
    Terry Lyon
    Laser Microwave Division, U.S. Army Environmental Hygiene Agency


    A tutorial guide is presented to provide uniform guidance when performing radiometric measurements upon laser systems to perform a hazard evaluation. This guide was requested by and presented to the Department of Defense (DOD) Laser System Safety Working Group (LSSWG) to serve as a standardized method when performing hazard evaluations primarily upon tactical and training military laser systems including laser rangefinders and designators. Technical information is provided in detail to select a suitable detector, preform radiometric measurements, assess laser system pointing errors, calculate laser pr...

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  • JLA Vol:25 Iss:3 (Surface tension stabilized laser welding (donut laser welding)&mdash;A new laser welding technique)


    Authors:
    Peter Haglund
    Department of Engineering Sciences and Mathematics, Luleå University of Technology and Westinghouse Electric Sweden AB, SE-721 63 Va¨sterås, Sweden

    Ingemar Eriksson
    John Powell
    Alexander Kaplan
    Department of Engineering Sciences and Mathematics, Luleå University of Technology


    A new laser welding process is presented which delivers a porosity free, spatter free weld. The process involves a donut shaped melt with a central hole of the same order of magnitude as the material thickness. The laser illuminates only the leading section of this melt. The hole is kept open by the melt surface tension.

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  • JLA Vol:14 Iss:1 (Cutting of slate tiles by CO<sub>2</sub> laser)


    Authors:
    M. Boutinguiza
    F. Lusquin˜os
    J. Pou
    R. Soto
    F. Quintero
    M. Pe´rez-Amor
    Departamento Fı´sica Aplicada Universidade de Vigo, Lagoas Marcosende 9, E-36200 VIGO, Spain

    K. Watkins
    Laser Engineering Group, Department of Engineering, The University of Liverpool, Liverpool L69 3GH, United Kingdom


    Slate is a natural stone which has the characteristic that shows a well-developed defoliation plane, allowing to easily split it in plates parallel to that plane which are particularly used as tiles for roof building. At present, the manufacturing of slate is mostly manual, bein...

    $25.00

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