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  • JLA Vol:16 Iss:4 (Laser transmission welding of polymer and wood composites: Material and joint mechanism related studies)


    Authors:
    H. Haferkamp
    A. von Busse
    S. Barcikowski
    A. Ostendorf
    J. Bunte
    Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany


    Laser beam transmission welding is an innovative and promising technology for many industries such as the automotive, electronic, and medical industry. Extension to application of this technology to wood components makes it also interesting for the woodworking and furniture industry. Therefore, several investigations in the field of welding of fiber reinforced thermoplastic and wood composites with polymers have been carried out. Focus is given to the determination of the weldability and weld ...

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  • JLA Vol:21 Iss:1 (Visualization of events inside kerfs during laser cutting of fusible metal)


    Authors:
    Peter Yudin
    Oleg Kovalev
    Khristianovich Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, Russia


    The subject of the research is mechanism of melt removal and striated roughness generation. Being the main obstacle limiting laser cutting process performance, these phenomena are widely discussed. Available theoretical descriptions are not conclusive, as they have nothing to be verified with. High temperatures and narrowness of the kerf severely limit visual access at a real facility. Observation will become possible if one wall of the kerf is made of glass. This possibility is utilized in present experiments, which reproduce the process at low tem...

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  • JLA Vol:26 Iss:1 (Investigation on reducing distortion by preheating during manufacture of aluminum components using selective laser melting)


    Authors:
    Damien Buchbinder
    Wilhelm Meiners
    Norbert Pirch
    Konrad Wissenbach
    Fraunhofer Institute for Laser Technology (ILT), Aachen 52074, Germany

    Johannes Schrage
    Chair for Laser Technology, RWTH Aachen University, Germany 52024, Aachen


    The additive manufacturing process selective laser melting (SLM) can be used to directly produce functional components made out of metal. During the construction process, however, thermally induced residual stress occurs due to the layered build-up and the local input of energy by means of a focused laser beam, which can lead to distortion of the component or sections of the component itself....

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  • JLA Vol:23 Iss:1 (Picosecond laser-induced color centers in glass optics)


    Authors:
    David Ashkenasi
    Andreas Lemke
    Applied Laser Technology, Laser- and Medical-Technology Berlin (LMTB) GmbH, Fabeckstr. 60-62, 14195 Berlin, Germany


    It is known that ionizing radiation (x ray, gamma rays, and electrons) can induce numerous changes in the physical properties of glasses. The most obvious effect is visible coloration, which is caused by the accumulation of color centers (defects) in the irradiated volume. The application of such induced color centers has prompted a renewed interest since they can be generated and bleached reversibly. We present results on laser-induced color centers in different types of glasses using picosecond laser pulses. By applyi...

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  • JLA Vol:7 Iss:3 (Study of liquid and vapor ejection processes during laser drilling of metals)


    Authors:
    Bekir S. Yilbas¸
    Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia


    In an experimental investigation of laser–metal interaction, one of the important parameters is the propagation velocity of the liquid–vapor interface. The quantity appears as a direct result of the theoretical examination of the interaction and may be used to test the accuracy of the theory. Consequently, in the present study, the nature of the interaction mechanism between a pulsed laser beam and metals is examined using streak photographs of the ejecta from four metals: titanium, tantalum, nickel, and EN58B stainless steel. It...

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  • JLA Vol:15 Iss:1 (Dual laser beam modification of high alumina ceramics)


    Authors:
    D. Triantafyllidis
    Array

    J. R. Bernstein
    Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom

    L. Li
    Department of Mechanical, Aerospace and Manufacturing Engineering, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom

    F. H. Stott
    Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom


    Alumina-based refractory materials are extensively used in high-temperature applications, such as linings in waste incinerators. A sign...

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  • JLA Vol:19 Iss:2 (Femtosecond laser microstructuring of hot-isostatically pressed zirconia ceramic)


    Authors:
    Niko Ba¨rsch
    Laser Zentrum Hannover, Hollerithallee 8, 30419 Hannover, Germany

    Kristian Werelius
    Department of Prosthodontics, Johann Wolfgang Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt/Main, Germany

    Stephan Barcikowski
    Fernando Liebana
    Uwe Stute
    Andreas Ostendorf
    Laser Zentrum Hannover, Hollerithallee 8, 30419 Hannover, Germany


    Densely sintered zirconia ceramics—especially hot-isostatically pressed forms of zirconia ceramics like hot-isostatically pressed yttria-stabilized tetragonal zirconia polycrystal (HIP Y-TZP)—have the potential of superseding conve...

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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‐500 258, India

    D. B. Goel
    Department of Metallurgical Engineering, University of Roorkee, Roorkee‐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:9 Iss:6 (Effect of nozzle orientation on the gas dynamics of inert-gas laser cutting of mild steel)


    Authors:
    Aaron D. Brandt
    Gary S. Settles
    Gas Dynamics Laboratory, Mechanical Engineering Department, Penn State University, University Park, PA 16802, U.S.A.


    This investigation applies sonic and supersonic coaxial and off‐axis nozzles to the cutting of mild steel sheet of 1–4 mm thickness. A 1.5 kW CW CO2 laser is used with nitrogen as the assist gas. Sonic coaxial cutting is compared to that of off‐axis nozzles, which vary in orientation from 20–60° behind the laser axis and in exit Mach number from 1 to 2.4. Results show a 50% increase in maximum cutting speed at approximately a 40° off‐axis nozzle angle. In com...

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