• JLA Vol:18 Iss:3 (The influence of joint gap on the strength of hybrid Nd:yttrium-aluminum-garnet laser-metal inert gas welds)


    Authors:
    M. Wouters
    Division of Manufacturing Systems Engineering, Luleå University of Technology, S-971 87 Luleå, Sweden

    J. Powell
    Division of Manufacturing Systems Engineering, Luleå University of Technology, S-971 87 Luleå, Sweden and Laser Expertise Ltd., Acorn Park Ind. Estate, Harrimans Lane, Nottingham NG7 2TR, United Kingdom

    A. F. H. Kaplan
    Division of Manufacturing Systems Engineering, Luleå University of Technology, S-971 87 Luleå, Sweden


    This article presents the results of an experimental and theoretical analysis of the effect of joint gap on the strength of hybrid laser-metal inert gas welds. ...

    $25.00

  • JLA Vol:23 Iss:1 (Picosecond laser-induced color centers in glass optics)


    Authors:
    David Ashkenasi
    Andreas Lemke
    Applied Laser Technology, Laser- and Medical-Technology Berlin (LMTB) GmbH, Fabeckstr. 60-62, 14195 Berlin, Germany


    It is known that ionizing radiation (x ray, gamma rays, and electrons) can induce numerous changes in the physical properties of glasses. The most obvious effect is visible coloration, which is caused by the accumulation of color centers (defects) in the irradiated volume. The application of such induced color centers has prompted a renewed interest since they can be generated and bleached reversibly. We present results on laser-induced color centers in different types of glasses using picosecond laser pulses. By applyi...

    $25.00

  • JLA Vol:7 Iss:3 (Study of liquid and vapor ejection processes during laser drilling of metals)


    Authors:
    Bekir S. Yilbas¸
    Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia


    In an experimental investigation of laser–metal interaction, one of the important parameters is the propagation velocity of the liquid–vapor interface. The quantity appears as a direct result of the theoretical examination of the interaction and may be used to test the accuracy of the theory. Consequently, in the present study, the nature of the interaction mechanism between a pulsed laser beam and metals is examined using streak photographs of the ejecta from four metals: titanium, tantalum, nickel, and EN58B stainless steel. It...

    $25.00

  • JLA Vol:16 Iss:4 (Laser transmission welding of polymer and wood composites: Material and joint mechanism related studies)


    Authors:
    H. Haferkamp
    A. von Busse
    S. Barcikowski
    A. Ostendorf
    J. Bunte
    Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany


    Laser beam transmission welding is an innovative and promising technology for many industries such as the automotive, electronic, and medical industry. Extension to application of this technology to wood components makes it also interesting for the woodworking and furniture industry. Therefore, several investigations in the field of welding of fiber reinforced thermoplastic and wood composites with polymers have been carried out. Focus is given to the determination of the weldability and weld ...

    $25.00

  • JLA Vol:21 Iss:1 (Visualization of events inside kerfs during laser cutting of fusible metal)


    Authors:
    Peter Yudin
    Oleg Kovalev
    Khristianovich Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, Russia


    The subject of the research is mechanism of melt removal and striated roughness generation. Being the main obstacle limiting laser cutting process performance, these phenomena are widely discussed. Available theoretical descriptions are not conclusive, as they have nothing to be verified with. High temperatures and narrowness of the kerf severely limit visual access at a real facility. Observation will become possible if one wall of the kerf is made of glass. This possibility is utilized in present experiments, which reproduce the process at low tem...

    $25.00

  • JLA Vol:9 Iss:6 (Effect of nozzle orientation on the gas dynamics of inert-gas laser cutting of mild steel)


    Authors:
    Aaron D. Brandt
    Gary S. Settles
    Gas Dynamics Laboratory, Mechanical Engineering Department, Penn State University, University Park, PA 16802, U.S.A.


    This investigation applies sonic and supersonic coaxial and off‐axis nozzles to the cutting of mild steel sheet of 1–4 mm thickness. A 1.5 kW CW CO2 laser is used with nitrogen as the assist gas. Sonic coaxial cutting is compared to that of off‐axis nozzles, which vary in orientation from 20–60° behind the laser axis and in exit Mach number from 1 to 2.4. Results show a 50% increase in maximum cutting speed at approximately a 40° off‐axis nozzle angle. In com...

    $25.00

  • JLA Vol:3 Iss:3 (Treating Birthmarks With Diabetes)


    Authors:
    Myron L. Wolbarsht
    Psychology Department, Duke University


    $25.00

  • JLA Vol:17 Iss:2 (Modeling of laser deposition and repair process)


    Authors:
    Lijun Han
    Kaushik M. Phatak
    F. W. Liou
    Department of Mechanical and Aerospace Engineering, University of Missouri-Rolla, Rolla, Missouri 65409-1350


    Laser aided deposition is a material additive based manufacturing process via metallurgically bonding the deposited material to the substrate. Due to its capability to bond various materials together, it becomes an attractive technology for part repair in small scale. However, the details of the process remain an active area for research because of the complicated interactions involved. In this study, a mathematical model was established to investigate thermal and mass transportation phenomena, which incl...

    $25.00

  • JLA Vol:21 Iss:4 (How the laser started)


    Authors:
    Charles Townes
    Department of Physics, University of California, Berkeley, California 94720


    $25.00

  • JLA Vol:8 Iss:3 (Commonwealth of Independent States (CIS) laser scene and Laser Association (LAS) activities)


    Authors:
    Ivan B. Kovsh
    LAS Headquarters, Moscow, Rozhdestvenkastr, 27, 117485, Russia


    $25.00

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