• 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)


    Authors:
    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...

    $25.00

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


    Authors:
    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‐circular profiles. In this approach, a plug‐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‐circular shaping process is identified. Simulation models are developed for testing the performance o...

    $25.00

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  • 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)


    Authors:
    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 ...

    $25.00

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


    Authors:
    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 ...

    $25.00

  • JLA Vol:23 Iss:2 (Surface texturing by laser cladding)


    Authors:
    A. Grueninger
    M. Hustedt
    D. Herzog
    M. Huse
    D. Kracht
    H. Haferkamp
    Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany

    A. Ostendorf
    Lehrstuhl fuer Laseranwendungstechnik, Ruhr-Universitaet Bochum, Universitaetsstr. 150, D-44780 Bochum, Germany


    Surface texturing is an established method for altering the structure of a surface. All known methods deal with material removal. For applications where only small walls remain on the surface, this means that most of the surface must be treated. In this paper, a new approach is presented in which texturing and laser cladding are co...

    $25.00

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


    Authors:
    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...

    $25.00

  • JLA Vol:20 Iss:2 (Laser bioeffects associated with ultrafast lasers: Role of multiphoton absorption)


    Authors:
    Randolph D. Glickman
    Department of Ophthalmology, University of Texas Health Science Center, San Antonio, Texas 78229-3900

    Thomas E. Johnson
    Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, Colorado 80523

    Gary D. Noojin
    David J. Stolarski
    Michael L. Denton
    Northrup Grumman Warfighter and Applications Department, San Antonio, Texas 78228-1330

    Neeru Kumar
    Department of Ophthalmology, University of Texas Health Science Center, San Antonio, Texas 78229-3900

    Benjamin A. Rockwell
    US Air Force Research Laboratory, AFRL/HEDO, Brooks City...

    $25.00

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


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


    $25.00

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