• JLA Vol:20 Iss:4 (Laser cutting of 2024-T3 aeronautic aluminum alloy)


    Authors:
    A. Riveiro
    F. Quintero
    F. Lusquin˜os
    J. Pou
    M. Pe´rez-Amor
    Departamento de Fi´sica Aplicada, Universidade de Vigo, ETS Ingenieros Industriales, Vigo, 36310, Spain


    Since the beginning of the aeronautic industry, aluminum alloys have played a crucial role in its development. Nowadays, different aluminum alloy families are the base material of many pieces of aerospace vehicles. In this work, a novel approach to process aluminum alloys is explored. The authors efforts are aimed to cut 2024-T3 plates by a CO2 laser. They used a novel laser cutting head assisted by a gas jet working in supersonic regim...

    $25.00

  • JLA Vol:25 Iss:5 (Heat transfer and fluid flow in additive manufacturing)


    Authors:
    A. Raghavan
    H. L. Wei
    T. A. Palmer
    T. DebRoy
    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802


    In laser-based direct energy deposition additive manufacturing, process control can be achieved through a closed loop control system in which thermal sensing of the melt pool surface is used to adjust laser processing parameters to maintain a constant surface geometry. Although this process control technique takes advantage of important in-process information, the conclusions drawn about the final solidification structure and mechanical properties of the deposited material are li...

    $25.00

  • JLA Vol:22 Iss:4 (Erratum: “Weld strength improvement for Al alloy by using laser weaving method” [J. Laser Appl. 22(3), 116 (2010)])


    Authors:
    Kwang-Deok Choi
    Young-Nam Ahn
    Cheolhee Kim
    Advanced Welding & Joining Technology Research Team, Korea Institute of Industrial Technology, 7-47 Songdo-Dong, Yeonsu-Gu, Incheon 406-840, Korea


    $25.00

  • JLA Vol:7 Iss:2 (Fraunhofer resource center for laser technology ‐ USA)


    Authors:
    Frank W. Kuepper
    Fraunhofer Resource Center for Laser Technology, Ann Arbor, MI, U.S.A.


    $25.00

  • JLA Vol:14 Iss:4 (Visible and invisible laser radiation—problems in laser safety terminology)


    Authors:
    David H. Sliney
    U.S. Army Center for Health Promotion and Preventive Medicine, Aberdeen Proving Grounds, Maryland 21010

    David J. Lund
    U.S. Army Medical Research Detachment, Brooks Air Force Base, Texas 78235

    Wesley J. Marshall
    U.S. Army Center for Health Promotion and Prevention Medicine, Aberdeen Proving Grounds, Maryland 21010


    The spectral band between 400 and 700 nm is termed “visible” in laser safety standards, this is not the full extent of the visible spectrum. Light, or visible radiation, is that which is perceived by the human eye, and the spectral bandwidth for vision is really larger, extending into what some r...

    $25.00

  • JLA Vol:19 Iss:1 (Three-dimensional numerical approach for geometrical prediction of multilayer laser solid freeform fabrication process)


    Authors:
    Masoud Alimardani
    Ehsan Toyserkani
    Jan P. Huissoon
    Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada


    This article presents the development of a three-dimensional numerical method for predicting transient geometrical and thermal characteristics of multilayer laser solid freeform fabrication as a function of process parameters and material properties. In the proposed method, the thermal domain is numerically obtained, assuming the interaction between the laser beam and powder stream is to be decoupled. Once the melt pool boundary is obtained, the physical domain is discretized in a cross-se...

    $25.00

  • JLA Vol:1 Iss:3 (CO<sub>2</sub> Laser Engraving System for Relief Plate to Print Corrugated Cardboard)


    Authors:
    K. Wakabayashi
    N. Sugishima
    NEC Corporation, Laser Equipment Div., 1120, Shimokuzawa, Sagamihara, JAPAN


    A very compact and economical CO2 laser engraving system to make relief plates for the purpose of printing corrugated cardboard has been developed. This system consists of a highly stable 500W CO2 laser and a high speed, easy handling image processing sub&hyphen;system. In this paper several new developments are described. This image processing technique for CO2 laser raster scanning and engraving has been newly developed. Every binary image is converted to the relief plate more easier than other reported engraving systems.

    $25.00

  • JLA Vol:9 Iss:4 (The application of external feedback in the laser spectroscopy of nonlinear media)


    Authors:
    B. V. Anikeev
    D. V. Sin'ko
    Department of Laser Physics, Volgograd State University, 2&hyphen;aya Prodolnay 30, Volgograd 400 062, Russia


    A new spectroscopic technique to gain information on the nonlinear constants of optical materials is presented. This technique is made possible due to the point that the application of an external controlled negative feedback (CNF) circuit to an intracavity nonlinear cell results in the generation of extended boundaries of the stability for the laser beam. This effect is analyzed using a semiclassical set of equations that govern laser oscillation. Measurements are made on systems containing either an instantaneous CNF circuit o...

    $25.00

  • JLA Vol:4 Iss:1 (Combustion&hyphen;Assisted Laser Cutting of a Difficult&hyphen;to&hyphen;Machine Superalloy)


    Authors:
    P. A. Molian
    M. Baldwin



    In laser cutting, the largest single application of lasers in manufacturing, the assist gas plays an important role in affecting the cutting performance. The assist gas is usually oxygen or an inert gas. In this work a mixture of acetylene and oxygen was employed to create combustion reactions during CO2 laser cutting that enabled an improvement in the cutting speed, and cut quality of a difficult&hyphen;to&hyphen;machine superalloy. A comparison with laser cutting of a plain carbon steel under identical conditions was also made to determine the usefulness of combustion energy. Results indicate that both cutting speed and qual...

    $25.00

  • JLA Vol:17 Iss:3 (Laser beam analysis in direct metal deposition process)


    Authors:
    Huan Qi
    Jyoti Mazumder
    Center for Laser Aided Intelligent Manufacturing, Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan 48109

    Larry Green
    Spiricon, Inc., Logan, Utah 84341

    Gary Herrit
    II-VI, Inc., Saxonburg, Pennsylvania 16056


    The quality of a laser beam profile and its stability play fundamental roles in laser material processing. Beam reflections may dramatically affect the beam quality under certain material processing conditions. In this study, experiments were carried out to examine the variations of the continuous wave CO2 laser beam profile during the direct metal...

    $25.00

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