• JLA Vol:23 Iss:1 (Mechanical and microstructural characteristics of the dissimilar materials butt joints by hybrid CO<sub>2</sub> laser-gas metal arc welding)


    Authors:
    HeeSeon Bang
    HanSur Bang
    Department of Naval Architecture and Ocean Engineering, Chosun University, Gwangju 501-759, Republic of Korea

    YouChul Kim
    Joining and Welding Research Institute, Osaka University, Osaka 567-0047, Japan

    IkHyun Oh
    Automotive Components Center, Korea Institute of Industrial Technology, Gwangju 500-480, Republic of Korea

    BackSub Sung
    Eco-friendly Components and Materials Education Center for Automobile, Gwangju 501-759, Republic of Korea


    This paper intends to present the applicability of hybrid [CO2 laser+gas metal arc (GMA)] welding process to dissimilar materials A...

    $25.00

  • JLA Vol:7 Iss:2 (Hazardous emissions: characterization of CO<sub>2</sub> laser material processing)


    Authors:
    H. Haferkamp
    M. Goede
    K. Engel
    J.&hyphen;S. Wittbecker
    Laser Zentrum Hannover e.V., Hollerithallee 8, D&hyphen;3000 Hannover 21, Germany


    Parallel to the growth of laser technology is a high interest in safety in industrial surroundings. The characteristics of hazards resulting from laser processing are complex and highly interdependent. In addition, very little fundamental scientific research on this topic exists. The Laser Zentrum Hannover e.V. (LZH) is working on a research project subsidized by the BMFT (German Federal Ministry for Research and Technology) concerning the characterization and reduction of hazardous emissions resulting ...

    $25.00

  • JLA Vol:16 Iss:3 (Laser synthesizing NiAl intermetallic and TiC reinforced NiAl intermetallic matrix composite)


    Authors:
    Minlin Zhong
    Laser Processing and Rapid Prototyping Research Center, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China

    Xiangyang Xu
    Laboratory for Surface Modification, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China

    Wenjin Liu
    Hongqing Sun
    Laser Processing and Rapid Prototyping Research Center, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China


    The NiAl intermetallic layers and NiAl matrix composite layers with TiC particulate reinforcement were successfully synthesized by laser cladding with coaxial powder feeding of Ni/Al clad p...

    $25.00

  • JLA Vol:21 Iss:1 (Microstructural analysis and oxidation protection behavior of Cr&ndash;Ni surface coatings of 347 stainless steel by rapid mirror scanning of a high power CO<sub>2</sub> laser)


    Authors:
    Jorge A. Ramos-Grez
    Departamento de Ingenieri´a Meca´nica y Metalu´rgica, Pontificia Universidad Cato´lica de Chile, Vicun˜a Mackenna 4860, Santiago, Chile

    David L. Bourell
    University of Texas at Austin, Mechanical Engineering Department, Austin, Texas 78712

    Madhav Rao Govindaraju
    Karta Technologies, Inc., San Antonio, Texas 78249


    A surface coating technique that uses a 1 kW CO2 laser beam actuated by two high-speed raster-scanning mirrors was utilized to selectively consolidate predeposited powder coatings consisting of 50%Cr-50% Ni (wt %) over the surface of 347 austenitic stainless st...

    $25.00

  • JLA Vol:9 Iss:5 (Threshold laser beam irradiances for melting and welding)


    Authors:
    K. H. Leong
    H. K. Geyer
    K. R. Sabo
    P. G. Sanders
    Technology Development Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A.


    A model based on the conservation of energy for a moving heat source incident on a flat plate is used to predict the threshold laser beam irradiance required to initiate melting on a metal surface. With the use of a non&hyphen;dimensional variable and its solution, the threshold irradiance can be predicted with the use of a simple equation. This equation is a function of the absorptivity of the surface, thermal conductivity of the metal, temperature increase for melting, diameter of the laser beam at th...

    $25.00

  • JLA Vol:3 Iss:3 (Determining Weld Quality in Pulsed Nd:YAG Laser Spot Welds)


    Authors:
    H. N. Bransch
    Z. Y. Wang
    J. T. Liu
    D. C. Weckman
    H. W. Kerr
    Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1


    For pulsed Nd:YAG laser spot welding applications, the development of optimum welding procedures ought to include various measures of weld size and quality, such as weld diameter, depth, surface contour and porosity. A split&hyphen;specimen technique has been developed that, despite the small size of the welds, allows such measurements to be made faster and more accurately than the traditional metallurgical technique involving sectioning, polishing and etching. In the sp...

    $25.00

  • JLA Vol:15 Iss:1 (Specific energy for pulsed laser rock drilling)


    Authors:
    Z. Xu
    C. B. Reed
    G. Konercki
    Technology Development Division, Argonne National Laboratory, Argonne, Illinois 60540

    R. A. Parker
    Parker Geoscience Consulting, LLC, Arvada, Colorado 80403

    B. C. Gahan
    Gas Technology Institute, Des Plains, Illinois 60018

    S. Batarseh
    R. M. Graves
    Department of Petroleum Engineering, Colorado School of Mines, Golden, Colorado 80401

    H. Figueroa
    Petroleos de Venezuela INTEVEP, S.A., Caracas 1070A, Venezuela

    N. Skinner
    Halliburton Energy Service, Carrollton, Texas 75006


    Application of advanced high power ...

    $25.00

  • JLA Vol:25 Iss:1 (Investigation on multi-track multi-layer epitaxial growth of columnar crystal in direct laser forming)


    Authors:
    XuanTuoi Do
    State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an 710049, China and Le Quy Don University, No. 100, Hoang Quoc Viet Street, Hanoi 7EN-218, Vietnam

    Dichen Li
    Anfeng Zhang
    Bin He
    Haiyang Zhang
    State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an 710049, China

    Tatkhoa Doan
    State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an 710049, China and Le Quy Don Technical Univers...

    $25.00

  • JLA Vol:19 Iss:1 (Melt pool temperature and its effect on clad formation in pulsed Nd:yttrium-aluminum-garnet laser cladding of Stellite 6)


    Authors:
    S. Sun
    Y. Durandet
    M. Brandt
    Industrial Laser Applications Laboratory, Industrial Research Institute Swinburne, Swinburne University of Technology, 533–545 Burwood Road, Hawthorn, VIC 3122, Australia


    The effective melt pool temperature in pulsed Nd:yttrium-aluminum-garnet laser cladding of Stellite 6 was measured with a two-color pyrometer. The pulse peak temperature (Tp) and durations when the melt pool temperature is above the melting point of Stellite 6 powder (t1) and substrate (t2) in each pulse have been calculated and averaged. The effects of laser operating parameters (pulse energy, pulse frequency, spot...

    $25.00

  • JLA Vol:24 Iss:1 (Surgical treatment of squamous cell carcinoma of tongue with carbon dioxide laser radiation (CO<sub>2</sub>))


    Authors:
    Walter Niccoli-Filho
    Lu´cio Murilo-Santos
    Aline R. C. Morosolli
    Gerusa de Oliveira Moura Cardoso
    Joa˜o Vitor dos Santos Canellas
    Array


    In this clinical study, we proposed to observe the efficacy of the treatment of squamous cell carcinoma of the tongue (SCCT) by carbon dioxide (CO2) laser surgery. Twelve patients with SCCT were treated with excisional surgery using the CO2 laser with a spot size of 0.8 mm, 10 W, power density of 2.5 W/cm2 in continuous mode, and under constant vacuum removal of the plume. The post surgical clinical evaluations were done every day until the sutures...

    $25.00

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