• JLA Vol:18 Iss:4 (Aluminum alloy welding by using a high power direct diode laser)

    N. Abe
    M. Tsukamoto
    Joining and Welding Research Institute, Osaka University, 11-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan

    K. Maeda
    K. Namba
    Research and Development Center, Sumitomo Light Metal Industries, Ltd., 3-1-12 Chitose, Minato-ku, Nagoya 455-8670, Japan

    J. Morimoto
    School of Science and Engineering, Kinki University, 3-4-1, Kowakae, Higashiosaka, Osaka 577-8502, Japan

    Aluminum alloys are the focus of increasing attention from the automobile industry because of their light weight, high formability, and easy recyclability. In this report, a 4 kW high power direct diode laser was used to exami...


  • JLA Vol:24 Iss:5 (Development of new processes for welding of thermal Al–Cu solar absorbers using diode lasers)

    Andre Springer
    Peter Kallage
    Michael Hustedt
    Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

    Stephan Barcikowski
    University of Duisburg-Essen, Technical Chemistry I, Universitaetsstr. 5–7, 45141 Essen, Germany

    Volker Wesling
    Heinz Haferkamp
    Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

    Flat-plate solar collectors are favorable devices to generate heat from the energy of the Sun. The central part of a collector, the solar absorber, is a front-coated aluminum sheet with a copper tube fixed on the back side in order to transport heated liquid. ...


  • JLA Vol:8 Iss:2 (Recent progress in laser surface treatment: <emph type="4">II</emph>. Adopted processing for high efficiency and quality)

    W. Bloehs
    B. Gru¨nenwald
    F. Dausinger
    H. Hu¨gel
    Institut fu¨r Strahlwerkzeuge, Universita¨t Stuttgart, Pfaffenwaldring 43, 70569 Stuttgart, Germany

    In Part I of this contribution, energy coupling and transport mechanisms were considered in detail. The second part concentrates on the effect of the spatial distribution of the energy in the laser beam, which will be discussed in connection with applications of laser surface technologies. Along these lines, a variety of beam shaping facilities is presented for laser hardening and cladding. Their purpose is to adapt the irradiated area to the workpiece ge...


  • JLA Vol:2 Iss:3 (Energy Coupling in Surface Treatment Processes)

    Friedrich Dausinger
    Markus Beck
    Jae H. Lee
    Eckhard Meiners
    Thomas Rudlaff
    Jialin Shen
    Institut fu¨r Strahlwerkzeuge, University of Stuttgart, Federal Republic of Germany

    In cutting or welding processes with lasers, deep penetration mechanisms allow high energy coupling rates. In surface treatment processes such as martensitic hardening, cladding and alloying, deep penetration of the laser beam is mostly not applicable. This generally leads to insufficient coupling rates. In this contribution several ways of enhancing the coupling rate are summarized. Following some theoretical considerations, results of exp...


  • JLA Vol:17 Iss:1 (Fracture control of unsupported ceramics during laser machining using a simultaneous prescore)

    A. E. Segall
    G. Cai
    R. Akarapu
    A. Romasco
    Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802

    B. Q. Li
    Department of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164

    While lasers offer many advantages when machining ceramics, costly premature fractures and related damage is the tradeoff often faced by manufacturers. This tradeoff is especially apparent for higher-speed machining of complex shapes where traditional “nail-bed” supports are not always practical. To help overcome these problems, re...


  • JLA Vol:21 Iss:3 (Laser welding of galvanized DP980 steel assisted by the GTAW preheating in a gap-free lap joint configuration)

    Shanglu Yang
    Radovan Kovacevic
    Center for Advanced Manufacturing, Southern Methodist University, Dallas, Texas, USA 75205

    With the increasing need for reducing the vehicle’s weight, improving fuel efficiency and safety, as well as the corrosion resistance, more and more galvanized high-strength steels have been used in the automotive industry. However, the successful laser welding of galvanized steels in gap-free lap joint configuration is still a big challenge. The high-pressurized zinc vapor is readily developed at the interface of the two metal sheets due to the lower boiling point of zinc (around 906 °C) than the melting point of steel (over 13...


  • JLA Vol:15 Iss:2 (Laser surface processing of titanium in air: Influence of scan traces overlapping)

    A. Pe´rez del Pino
    P. Serra
    J. L. Morenza
    Departament de Fı´sica Aplicada i Òptica, Universitat de Barcelona, E-08028 Barcelona, Spain

    Laser surface treatments of titanium in air have been performed through a pulsed Nd:yttrium–aluminum–garnet (λ=1.064 μm) laser. Several samples have been obtained modifying the laser scan velocity and partial overlapping of consecutive traces, in order to study the influence of these parameters on the surface morphology. Scanning electron microscopy and profilometry measurements have revealed different surface morphologies depending on the physical processes involved in th...


  • JLA Vol:19 Iss:2 (Intrabeam viewing of extended-source lasers with telescopes)

    Wesley J. Marshall
    E. Christopher Brumage
    David H. Sliney
    U.S. Army Center for Health Promotion and Preventive Medicine, AberdeenProving Ground, Maryland 21010-5403

    Magnifying optics can increase the hazards for intrabeam viewing of lasers. Although it is rather straightforward to evaluate these increased hazards for point-source lasers at distance, limited information is available for determining the hazards from viewing extended-source lasers from within the beam when magnifying optics are used. Since intrabeam viewing of nearly all lasers results in an extremely small retinal image, commonly known as a “point source,” extended-source m...


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

    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...


  • JLA Vol:8 Iss:5 (Taking advantage of laser properties to enhance demonstrations and student laboratories)

    Michele L. Brill
    Camden County College — Physics/Lasers, Box 200, Blackwood, NJ 08012, U.S.A.

    This paper reflects the proceedings of a workshop for local educators provided by Camden County College Laser Curriculum faculty which addressed the question: ‘How can the teacher take advantage of laser properties to improve or enhance demonstrations and student labs?’ Explored here are illustrative ways in which to utilize, for educational purposes, the three well&hyphen;known characteristics of lasers: directionality, monochromaticity, and coherence. There is a faculty overlap between the Physics Department and the Laser Curriculum faculty at the college. The use...



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