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  • JLA Vol:18 Iss:4 (Influence of joint geometry and fit-up gaps on hybrid laser-metal active gas (MAG) welding)


    Authors:
    Y. Yao
    Jilin University and China FAW Group Corporation R&D Center, No. 35 Chuangye Street, 130011 Changchun, China

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

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

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

    ...

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  • JLA Vol:7 Iss:1 (Development of laser finishing for non‐circular profiles)


    Authors:
    Ko‐Wang Liu
    Paul S. Sheng
    Department of Mechanical Engineering, University of California, Berkeley, CA 94720‐1740, U.S.A.


    A laser‐based technique for finishing of non‐circular cylindrical parts is presented. In this process, the frequency characteristics of a desired non‐circular shape is extracted from a CAD through a Fast Fourier Transform algorithm and implemented through a CO2 laser machining system. A galvanometer‐based scanner is used in the process to achieve programmable beam trajectories and high‐speed finishing. An error estimation scheme can be developed to determine the final dimensional erro...

    $25.00

  • JLA Vol:17 Iss:1 (An experimental and numerical study of the influence of diode laser beam shape on thin wall direct metal deposition)


    Authors:
    Andrew J. Pinkerton
    Lin Li
    School of Mechanical, Aerospace, and Civil Engineering, The University of Manchester, Sackville Street, Manchester, M60 1QD U.K.


    Use of the high powered diode laser (HPDL) for direct metal deposition enables multiple layer cladding to be performed with a nominally rectangular beam, traversed at different angles to the fast axis, or with a fiber-coupled, circular beam. These factors may provide an advantage over the traditional beam profiles of CO2 and Nd:YAG lasers, so there is a need to examine the effect that they have on the process and final product characteristics. This article reports such an examination. A 1.5 kW ...

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  • JLA Vol:21 Iss:3 (Multibeam fiber laser cutting)


    Authors:
    Flemming Ove Olsen
    Klaus Schuett Hansen
    Jakob Skov Nielsen
    Department of Mechanical Engineering, Technical University of Denmark, Kongens Lyngby DK-2800, Denmark


    The appearance of the high power high brilliance fiber laser has opened for new possibilities in laser materials processing. In laser cutting this laser has demonstrated high cutting performance compared to the dominating cutting laser, the CO2 laser. However, quality problems in fiber-laser cutting have until now limited its application to metal cutting. In this paper the first results of proof-of-principle studies applying a new approach (patent pending) for laser cutting with h...

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  • JLA Vol:9 Iss:3 (Experimental study of cutting thick aluminum and steel with a chemical oxygen&ndash;iodine laser using an N<sub>2</sub> or O<sub>2</sub> gas assist)


    Authors:
    David L. Carroll
    James A. Rothenflue



    A chemical oxygen–iodine laser (COIL) was used to cut aluminum and carbon steel. Cut depths of 20 mm in aluminum and 41 mm in carbon steel were obtained using an N2 gas assist and 5–6 kW of power on target. The same laser at the same power level produced a cut depth of 65 mm in carbon steel with an O2 gas assist; a low quality cut to a depth of nearly 100 mm in carbon steel was also demonstrated. These data are compared with existing COIL and CO2 laser cutting data. COIL cuts carbon steel and stainless steel at approximately the same rate. For a given cut depth, power and spot size...

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  • JLA Vol:4 Iss:2 (Dynamic Laser Doppler Velocimetry on Solid Surfaces)


    Authors:
    Milind M. Rajadhyaksha
    Warren H. Stevenson
    Applied Optics Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, U.S.A.


    This paper presents the results of a detailed analytical and experimental investigation into the accuracy of a differential laser Doppler velocimeter (LDV) for dynamic, solid surface velocity measurements made over very short averaging times on the order of one millisecond. Accuracy limitations are derived, along with operating conditions and signal processing considerations needed to optimize LDV performance. An experiment is described which demonstrates the use of an LDV to instantaneously and accurate...

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  • JLA Vol:15 Iss:3 (Steady-state laser cutting modeling)


    Authors:
    Ce´dric Mas
    Re´my Fabbro
    CLFA, 16 bis Avenue Prieur de la Côte d’Or, 94114 Arcueil Cedex, France

    Yannick Goue´dard
    OPTIS, ZE la Farlède, BP 275, 83078 Toulon Cedex 9, France


    We present a global self-consistent model of the laser cutting process where we have taken into account the main parameters of the process that are the laser beam intensity distribution, the thermal phenomena controlling the melt parameters, the fluid, both cutting gas and melt hydrodynamics, and the local equilibrium of the geometry of the cutting front. This steady state approach provides us with different fluid velocities, surface ...

    $25.00

  • JLA Vol:19 Iss:3 (Single-Pass and Multi-Pass Laser Cutting of Si&ndash;SiC: Assessment of the Cut Quality and Microstructure in the Heat Affected Zone)


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

    A. J. S. Fernandes
    Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal


    Experimental investigations on the laser cutting of thick silicon infiltrated silicon carbide (Si–SiC) elements are presented. Si–SiC is a fully dense ceramic composite with high hardness and chemical and thermal stability, which makes it a valuable material in severe conditions. However, machining is still a challenging task. A...

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  • JLA Vol:23 Iss:3 (Parameter optimization of a laser-induced fluorescence system for <em>in vivo</em> screening of oral cancer)


    Authors:
    V. K. Unnikrishnan
    Rajesh Nayak
    Rodney Bernard
    Centre for Atomic and Molecular Physics, Manipal University, Manipal, 576 104, India

    K. Jeena Priya
    Department of Oral Medicine and Radiology, MCODS Mangalore, Manipal University, Manipal, 575 001, India

    Ajeetkumar Patil
    Centre for Atomic and Molecular Physics, Manipal University, Manipal, 576 104 India

    J. Ebenezer
    PG & Research Department of Physics, Jamal Mohamed College, Tiruchinapalli, Manipal, 620 020, India

    Keerthilatha M. Pai
    Department of Oral Medicine and Radiology, MCODS Manipal, Manipal University, Manipal,576 104 India<...>

    $25.00

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