• JLA Vol:21 Iss:1 (Enhancing dual phase steel formability by diode laser heat treatment)


    Authors:
    Edoardo Capello
    Barbara Previtali
    Politecnico di Milano, Dipartimento di Meccanica Via La Masa 1, I-20156 Milan, Italy


    This paper studies the effect of different typologies of surface treatment by diode laser on the local formability of dual phase steel. An analytical thermal model allowed the temperature and cooling rate curves to be predicted and used to select the process parameter conditions. Microhardness measurements, microstructure observations, mechanical tensile test, and Erichsen cup test allowed the positive effect of the heat treatment on dual phase steel formability to be quantified.

    $25.00

  • JLA Vol:25 Iss:3 (Surface tension stabilized laser welding (donut laser welding)—A new laser welding technique)


    Authors:
    Peter Haglund
    Department of Engineering Sciences and Mathematics, Luleå University of Technology and Westinghouse Electric Sweden AB, SE-721 63 Va¨sterås, Sweden

    Ingemar Eriksson
    John Powell
    Alexander Kaplan
    Department of Engineering Sciences and Mathematics, Luleå University of Technology


    A new laser welding process is presented which delivers a porosity free, spatter free weld. The process involves a donut shaped melt with a central hole of the same order of magnitude as the material thickness. The laser illuminates only the leading section of this melt. The hole is kept open by the melt surface tension.

    $25.00

  • JLA Vol:9 Iss:5 (Experimental development of a machining database for the CO<sub>2</sub> laser cutting of ceramic tile)


    Authors:
    S. A. J. Livingstone
    K. L. Chua
    I. Black
    Department of Mechanical and Chemical Engineering, Heriot&hyphen;Watt University, Riccarton, Edinburgh EH14 4AS, U.K.


    This paper covers the cutting of commercially&hyphen;available ceramic tiles using a CO2 laser cutting machine, with the object of producing a laser beam machining database which contains the essential parameter information for their successful processing. Various laser cutting parameters were investigated that would generate a cut in ceramic tile which required minimal posttreatment. The effects of various shield gases, multipass cutting and underwater cutting were also examined.

    $25.00

  • JLA Vol:3 Iss:3 (Fusion Zone Structures in Laser Welded Al&hyphen;SiC Composites)


    Authors:
    Mary H. McCay
    T. Dwayne McCay
    Narendra B. Dahotre
    C. Michael Sharp
    Center for Laser Applications, University of Tennessee Space Institute, Tullahoma, Tennessee 37388


    Metal matrix composites continue to be desirable structural materials but difficulties in joining limit their usefulness. This paper describes the results of a study on the laser welding of A356&hyphen;AI/SiC particulate composites. Three separate processing regimes are identified based upon analytical model predictions and metallographic analysis of the solidification structures.

    $25.00

  • JLA Vol:15 Iss:1 (Effect of wire feed position on laser welding with filler wire)


    Authors:
    A. S. Salminen
    V. P. Kujanpa¨a¨
    Lappeenranta University of Technology, Laser Processing Centre, Tuotantokatur 2, FIN 53850 Lappeenranta, Finland


    The utilization of the laser welding process with filler wire addition is often considered a complicated and difficult process which has too high accuracy demands for a work shop floor. This study shows the effect of some of the most important welding variables to the quality and efficiency of laser welding when welding with filler wire. The material used was a common structural steel St52/37 of 6 mm in thickness. The joint type used was a butt joint. Acceptable weld quality was achieved with most of the tested p...

    $25.00

  • JLA Vol:19 Iss:1 (Combining high-speed laser perforation and cold roll forming for the production of biomedical microfiltration membranes)


    Authors:
    M. Baumeister
    K. Dickmann
    Laser Center University of Applied Sciences Muenster (LFM), Stegerwaldstrasse 39, 48565 Steinfurt, Germany

    A. P. Hoult
    SPI, 3 Wellington Park, Tollbar Way Hedge End, Southampton SO30 2QU, United Kingdom


    A novel high speed two-step technique capable of performing large matrices of very small pores with micron dimensions in large sheets of thin stainless steel foils has been developed. This process combination is initiated by high-speed “on-the-fly” laser perforation. A 100 W fiber laser is capable of a very high drilling rate making it an attractive option for the creation of large drilling matrices ...

    $25.00

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