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  • 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:25 Iss:1 (Fatigue crack propagation in laser alloyed ductile cast iron surface)


    Authors:
    Zheng-yang Li
    Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China and Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China

    Hai-yan Zhao
    Yu Gu
    Min-lin Zhong
    Bin Zhang
    Hong-jun Zhang
    Wen-jin Liu
    Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China

    Zhi-yuan Ren
    Ming-jiang Yang

    $25.00

  • JLA Vol:22 Iss:4 (Effect of laser and laser hybrid welding on the corrosion performance of a lean duplex stainless steel)


    Authors:
    Elin M. Westin
    Outokumpu Stainless AB, Avesta Research Center, P.O. Box 74, 774 22 Avesta, Sweden

    Anna Fellman
    Laser Processing Laboratory, Lappeenranta University of Technology, Tuotantokatu 2, 53850 Lappeenranta, Finland


    The use of duplex stainless steel increases steadily worldwide and the fluctuations in nickel price the recent years have contributed to further growth. The lean duplex grade Outokumpu LDX 2101® (EN 1.4162, UNS S32101) has a low nickel content and is alloyed with nitrogen and manganese to give a balanced microstructure. It means that good austenite formation is obtained even when laser welding autogenously (without fille...

    $25.00

  • JLA Vol:7 Iss:2 (Fraunhofer‐Institut fu¨r Lasertechnik)


    Authors:
    Eckhard Beyer
    Fraunhofer‐Institut fu¨r Lasertechnik, Aachen, Germany


    $25.00

  • JLA Vol:15 Iss:4 (Induction heat treatment of laser welds)


    Authors:
    Claus Bagger
    Joakim Ilsing Sørensen
    Flemming O. Olsen
    Manufacturing Engineering and Management, Materials and Process Technology, Technical University of Denmark, Building 425, DK-2800 Lyngby, Denmark


    In this article, a new approach based on induction heat treatment of flat laser welded sheets is presented. With this new concept, the ductility of high strength steels GA260 with a thickness of 1.8 mm and CMn with a thickness of 2.13 mm is believed to be improved by prolonging the cooling time from 750 to 450 °C. Initially, a simple analytical model was used to calculate the ideal energy contributions from a CO2 high power laser s...

    $25.00

  • JLA Vol:19 Iss:4 (Ablation and cutting of silicon wafer and micro-mold fabrication using femtosecond laser pulses)


    Authors:
    Ying Wang
    Nengli Dai
    Yuhua Li
    Xinlin Wang
    Peixiang Lu
    Wuhan National Laboratory for Optoelectronics and School of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China


    Femtosecond laser micromachining of silicon wafer at a relatively higher energy fluence level (>50 J/cm2) is investigated. Laser ablating spots and cutting kerfs are examined by means of charge coupled device camera and scanning electron microscopy. The area of ablated spots increases linearly with increasing the shot number from 1 to 16 and shows saturation with t...

    $25.00

  • JLA Vol:9 Iss:4 (Dual wavelength laser beam alloying of aluminum alloy for enhanced corrosion resistance)


    Authors:
    Z. Liu
    K. G. Watkins
    W. M. Steen
    R. Vilar
    M. G. Ferreira



    Aluminum alloys are known for their poor resistance to localized attack and, in particular, for pitting in chloride‐containing electrolytes. In this paper, improvement of the pitting corrosion resistance of 2014‐T6 aluminum alloy has been investigated by means of laser surface alloying of Cr into the substrate. Since aluminum is a highly reflective and thermally conductive material, it is often difficult to process with laser beams. Oxide films on the surface can prevent surface alloying as with the case of Cr alloying into aluminum by in‐situ...

    $25.00

  • JLA Vol:4 Iss:1 (The Impact of European Standards, Directives and the CE Mark)


    Authors:
    A. Roy Henderson
    Bioptica, St. John's Innovation Park, Cambridge U.K.


    $25.00

  • JLA Vol:14 Iss:1 (Multiple reflection and its influence on keyhole evolution)


    Authors:
    Hyungson Ki
    Pravansu S. Mohanty
    Jyotirmoy Mazumder
    Center for Laser Aided Intelligent Manufacturing, Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, Michigan 48109-2125


    In laser drilling and keyhole welding, multiple reflection phenomena determine how the energy is transferred from the laser beam to the workpiece, and, most importantly, all other physics such as fluid flow, heat transfer, and the cavity shape itself depend on these phenomena. In this study, a multiple reflection model inside a self-consistent (or self-evolving) cavity has been developed based on the level set method and ray tracing t...

    $25.00

  • JLA Vol:18 Iss:2 (Laser ablation of silicon wafer with a water microdrop)


    Authors:
    Kouki Shimizu
    Kunimitsu Takahashi
    Photonics and Materials Research Department, Institute of Research and Innovation, 1201 Takada, Kashiwa, Chiba 277-0861, Japan

    Hiroshi Morikazu
    Nobumori Ogoshi
    Koichi Takeyama
    DISCO Corporation, 13-11 Omori-Kita 2-chome, Ota-ku, Tokyo 143-8580, Japan

    Yoji Wakayama
    LINTEC Corporation, 5-14-42 Nishiki-cho, Warabi-shi, Saitama 335-0005, Japan

    Tetsuro Obara
    Saitama University, 255-Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan


    We have developed a new laser ablation process using a water-microdrop with a diameter of 70 μm....

    $25.00

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