• 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

  • 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 ...

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  • 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 ...

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  • JLA Vol:8 Iss:1 (Frequency&ndash;time characteristics of air&hyphen;borne signals from laser welds)


    Authors:
    D. Farson
    K. Hillsley
    J. Sames
    R. Young



    The acoustic emissions from laser lap welds in stainless steel sheet were recorded and analyzed. The acoustic signals emanating from the weld were sensed with an instrument microphone and analyzed using short&hyphen;time Fourier spectra to characterize their time&hyphen;frequency distributions. It was determined that the acoustic spectrum of good&hyphen;quality, full&hyphen;penetration welds could be differentiated from the spectra of poor&hyphen;quality welds, defined as either partial&hyphen;penetration welds or welds having a gap between the sheets being joined. A novel, relatively simple class...

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  • JLA Vol:24 Iss:2 (Synthesis of nitrogen-doped diamond films using vibrational excitation of ammonia molecules in laser-assisted combustion flames)


    Authors:
    L. S. Fan
    Z. Q. Xie
    J. B. Park
    X. N. He
    Y. S. Zhou
    Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0511

    L. Jiang
    Department of Mechanical and Automation Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China

    Y. F. Lu
    Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0511


    Nitrogen-doped diamond was synthesized in open air using laser-assisted combustion flame method. A wavelength-tunable CO2 laser was used to resonantly excite the vibration mod...

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  • JLA Vol:6 Iss:3 (Acoustic emission response of soda lime glass after a single Nd&hyphen;YAG laser pulse)


    Authors:
    R. Harrysson
    P. Vomacka
    Department of Engineering Materials, Luleå University of Technology, S&hyphen;951 87 Luleå, Sweden


    When machining brittle solids with a laser, crack formation can occur in the material around the irradiated area causing a strength reduction of the machined material. The purpose of this work was to study a well known brittle material (soda lime glass) by means of acoustic emission (AE) in order to investigate the correlation between visually observed crack formation and detected AE energy released by the crack formation in the material. During and after irradiation of soda lime glass with an Nd&hyphen;YAG laser pulse, the number...

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  • JLA Vol:1 Iss:2 (A Study in Surface Alloying of Titanium Alloys)


    Authors:
    A. Bharti
    R. Sivakumar
    Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad&hyphen;500 258, India

    D. B. Goel
    Department of Metallurgical Engineering, University of Roorkee, Roorkee&hyphen;247 667, India


    A 5 KW CW CO2 laser has been used to alloy the surface of Ti6Al4V alloy with carbon. As a result the average microhardness was increased from 365 to 600 kg/mm.2 Compositional inhomogeneity was observed on the alloyed surface, however the compositional inhomogeneity index reduced considerably by cross scanning with defocused laser beam. Surface roughness of the alloyed surface was also studied and the roughn...

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  • JLA Vol:14 Iss:2 (Development of simulated pigmented lesions in an optical skin-tissue phantom: Experimental measurements in the visible and near infrared)


    Authors:
    Manuela Lualdi
    Ambrogio Colombo
    Alberto Mari
    Stefano Tomatis
    Renato Marchesini
    Medical Physics Unit, Istituto Nazionale per lo Studio e la Cura dei Tumori, Milan, Italy


    Realistic, pigmented skin simulants (“phantoms”) can be useful in optimizing dermal laser procedures and for laser surgical training. Diffuse reflectance of skin pigmented lesions depends on the amount and distribution of the absorbing/diffusing chromophores, mainly hemoglobin and melanin, embedded in the skin layers. The reason why diffuse reflectance of benign melanocytic lesions is different from that of melanoma is still unclear. In an attempt...

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  • 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

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