• JLA Vol:15 Iss:2 (Automatic detection of lack of fusion defects in CO<sub>2</sub> laser gear welding)

    A. Ghasempoor
    Department of Mechanical, Aerospace, and Industrial Engineering, Ryerson University, Toronto, Ontario M5B 2K3, Canada

    P. Wild
    M. Auger
    Department of Mechanical Engineering, Queen’s University, Kingston, Ontario K7K 3N6, Canada

    R. Mueller
    Powerlasers Ltd., Advanced Technologies Centre, Kitchener, Ontario N2G 2Y5, Canada

    Laser welding is becoming increasingly important in the automotive industry and quality of the weld is critical for a successful application. In many cases the increase in welding speed provided by laser welding has resulted in the need for an automated, on-line weld monitoring system....


  • JLA Vol:19 Iss:3 (Improving coaxial measurements in laser welding by correcting distortions of a laser focus lens with a wide field of view)

    Jorg Entzinger
    Dimitrios Iakovou
    Ronald Aarts
    Johan Meijer
    Mechanical Automation Laboratory, University of Twente, Faculty of Engineering Technology Horst-CTW, P.O. Box 217, 7500 AE Enschede, The Netherlands

    A compact, lightweight, and multifunctional head for robotic laser welding applications has been equipped with a camera to provide a real time image stream of the work piece for seam teaching, tracking, and inspection purposes [D. Iakovou, R. G. K. M. Aarts, and J. Meijer, “Integrated sensors for robotic laser welding,” in Proceedings of the Third International WLT Conference on Lasers in Manufacturing, Munich, German...


  • JLA Vol:1 Iss:1 (Endoholography in Medicine)

    Marc D. Friedman
    Hans I. Bjelkhagen
    Max Epstein
    Biomedical Engineering, Northwestern University, Evanston, Illinois


  • JLA Vol:8 Iss:6 (A modeling study on the influence of pulse shaping on keyhole laser welding)

    P. S. Mohanty
    A. Kar
    J. Mazumder

    A theoretical analysis describing the effects of pulse shaping on keyhole laser welding is presented. Calculation of the keyhole profile and melt pool dimensions was performed by the balancing of surface forces and energy at the liquid&hyphen;vapor and solid&hyphen;liquid interfaces in three dimensions. The effect of temporal pulse shape on weld dimensions has been examined over a range of power densities, pulse times and pulse frequencies. Several pulse types (e.g., top&hyphen;hat, Gaussian, ramp&hyphen;up and ramp&hyphen;down pulses) have been considered. Pulse shaping showed significant effect on the weld dimensio...


  • JLA Vol:1 Iss:4 (Recent Developments in Laser Melt/Particle Injection Processing)

    K. P. Cooper
    Geo&hyphen;Centers, Inc., 10903 Indian Head Highway, Fort Washington, Maryland 20744

    P. Slebodnick
    Naval Research Laboratory, Washington, D.C. 20375.

    Investigations into crack formation in particle injected surfaces and into microstructural evolution during cladding were some of the recent developments in laser melt/particle injection processing. Both surface modification techniques involved blowing powder particles into a melt pool formed by a laser beam. When the particulate materials were metal carbides composite surface layers were formed and the thermal stresses that developed during cooling of the carbide injected layer resulted in th...


  • JLA Vol:18 Iss:1 (The effect of shielding gas composition on welding performance and weld properties in hybrid CO<sub>2</sub> laser&ndash;gas metal arc welding of carbon manganese steel)

    Anna Fellman
    Laser Processing Laboratory, Department of Mechanical Engineering, Lappeenranta University of Technology, FIN-53850 Lappeenranta, Finland

    Veli Kujanpa¨a¨
    Laser Processing Laboratory, Department of Mechanical Engineering, Lappeenranta University of Technology and VTT Industrial Systems, FIN-53850 Lappeenranta, Finland

    Metals industries producing large structures currently have a particular interest in hybrid laser welding processes, which possess advantages compared with conventional methods of welding. One major benefit is a reduction in deformation that enables the amount of postweld finishing work to be reduced. Assembly then also ...


  • JLA Vol:22 Iss:3 (Laser lap welding of zinc coated steel sheet with laser-dimple technology)

    Hongping Gu
    Stronach Centre for Innovation, Magna International Aurora, Canada L4G 7L6

    Laser beam welding technology has been widely used to weld automobile components, especially for tailored blank welding. In order to provide best corrosion resistance to the welded sheet metal parts, zinc coated steel sheets are normally used. The zinc coating poses no issues to the butt joining of the sheet metals. However, when laser welding technology is applied to lap joint of these sheets, the welding process is not straightforward. Special techniques must be employed to allow the venting of the zinc vapor that is generated at the interface between the paired sheets. Many efforts have ...


  • JLA Vol:9 Iss:2 (Kinematic compensation of repetitive errors for non&hyphen;circular laser shaping)

    P. Sheng
    K. Liu
    Department of Mechanical Engineering, University of California, Berkeley, CA, U.S.A.

    This paper presents an approach for kinematic compensation of the laser shaping process which is capable of achieving improved dimensional accuracy for non&hyphen;circular profiles. In this approach, a plug&hyphen;in repetitive controller is added into the existing position servo loop to improve tracking of the desired sinusoidal trajectory and subsequently reduce tracking errors. The effect of tracking errors on different dimensional error modes in the non&hyphen;circular shaping process is identified. Simulation models are developed for testing the performance o...


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  • JLA Vol:16 Iss:1 (Laser annealing of silicon nanocrystal films formed by pulsed-laser deposition)

    C. F. Tan
    X. Y. Chen
    Laser Microprocessing Laboratory and Silicon Nano Device Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

    Y. F. Lu
    Department of Electrical Engineering, University of Nebraska, Lincoln, Nebraska 68588-0511

    Y. H. Wu
    B. J. Cho
    J. N. Zeng
    Laser Microprocessing Laboratory and Silicon Nano Device Laboratory, Department of Electric and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

    We report the laser annealing effects on...



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