• ICALEO 2005 Paper #2005 (Laser Braze Welding Using Hot (88%-Al,12%-Si) Filler Material to Join Steel with Aluminum)

    Laser Braze Welding Using Hot (88%-Al,12%-Si) Filler Material to Join Steel with Aluminum
    Authors:
    Alexandre Mathieu, LTm-IUT Le Creusot; Le Creusot France
    Jean-claude Viala, LMI; Villeurbanne France
    Simone MatteLTm; Le Creusot France
    Dominique Grevey, LTm; Le Creusot France
    Presented at ICALEO 2005

    New anti-pollution and energy saving laws impose reduction of fuel consumption for vehicles of the automobile industry. Reducing the weight of vehicle by introducing Aluminum parts into a steel car-body can be a solution for this reduction. Laser braze welding represent an adequate process than can be used to realize this kind of new structure.
    The main pr...

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  • ICALEO 2005 Paper #2006 (Distortion Minimisation and Shielding Gas Flow Optimisation in CO2-laser Remote Welding of Steel)

    Distortion Minimisation and Shielding Gas Flow Optimisation in CO2-laser Remote Welding of Steel
    Authors:
    Claus Thomy, BIAS Bremer Institut fr angewandte Strahltechnik; Bremen Germany
    Steffen Neumann, BIAS Bremer Institut fr angewandte Strahltechnik; Bremen Germany
    Frank Vollertsen, BIAS Bremer Institut fr angewandte Strahltechnik; Bremen Germany
    Thomas Seefeld, BIAS; Bremen Germany
    Presented at ICALEO 2005

    In CO2-laser remote welding, a laser beam is rapidly deflected by a system of moving mirrors and directed towards the workpiece over distances exceeding 1000 mm. From such an arrangement, various advantages and disadvantages arise.
    On the one hand, ...

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  • ICALEO 2005 Paper #201 (Chemistry in Laser Material Processing)

    Chemistry in Laser Material Processing
    Authors:
    Wolfgang Danzer, Linde Gas AG; Unterschleissheim Germany
    Presented at ICALEO 2005

    High-speed film technique has been used to examine laser cutting and to understand the difference to oxy-fuel cutting. Chemical reactions during ignition phase of the cutting process are different as can be seen from the films resulting in different speeds. Also in laser welding chemical reactions steer processing speed and performance. Active substancies clearly affect the surface tensions and melt flow direction in laser welding of steel. In laser welding of aluminium ,in contrast, oxygen is not beneficial and molten aluminium oxides are pushed aside by the laser ...

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  • ICALEO 2005 Paper #202 (Enhanced Cutting of Polycrystalline Diamond with a Q-Switched Diode Pumped Solid State Laser)

    Enhanced Cutting of Polycrystalline Diamond with a Q-Switched Diode Pumped Solid State Laser
    Authors:
    Jozef Wendland, Powerlase Ltd; Crawley West Sussex UK
    Matt Henry, Powerlase Ltd; Crawley West Sussex Great Britain
    Paul Harrison, Powerlase Ltd; Crawley West Sussex UK
    Michael Brownell, Powerlase Ltd; Crawley West Sussex UK
    Presented at ICALEO 2005

    In this paper a progressive empirical study is conducted in refining the laser cutting of Polycrystalline Diamond (PCD) in ongoing work. PCD is one of the hardest substances known and is used extensively in cutting tools for non-ferrous materials. It is extremely difficult to cut by conventional means and the c...

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  • ICALEO 2005 Paper #203 (Application a High Brightness Yb Fibre Laser In High Speed Cutting of C-Mn Sheet Steel)

    Application a High Brightness Yb Fibre Laser In High Speed Cutting of C-Mn Sheet Steel
    Authors:
    M. Sparkes, Univ. of Cambridge; Cambridge UK
    William O'Neill, Univ. of Cambridge; Cambridge UK
    Presented at ICALEO 2005

    Previous work using high quality CO2 lasers have shown high levels of performance when cutting thin section steels in the range 0.5-1.0mm. However, the use of the CO2 lasers is compromised as a result of the reduced operating window produced by the need for short-focal length lenses and the deleterious development of intense plasma in the cutting zone. It is thought that the application of a high power Yb fibre laser could offer substantial physical benefits such as l...

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  • ICALEO 2005 Paper #205 (Study of Metal Drilling Characteristics with Q-Switched CO2 Laser)

    Study of Metal Drilling Characteristics with Q-Switched CO2 Laser
    Authors:
    Atsushi Sugihashi, Nippon Steel Corporation; Futtsu Chiba Japan
    Koji Hirano, Nippon Steel Corporation; Futtsu Chiba Japan
    Motoi Kido, Nippon Steel Corporation; Futtsu Chiba Japan
    Naoya Hamada, Nippon Steel Corporation; Futtsu, Chiba Japan
    Presented at ICALEO 2005

    We studied metal drilling characteristics using Q-switched CO2 laser with the average output power of 1kW. A rotating chopper inserted in the cavity realized the Q-switch operation. The pulse repetition rate of the laser is as high as tens of kHz. The temporal waveform of the pulse is comprised of high-peak spike at the ve...

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  • ICALEO 2005 Paper #207 (The Combi-Head: Truly Flexible Laser Processing by Cutting and Welding in a Single Machine with a Single Tool)

    The Combi-Head: Truly Flexible Laser Processing by Cutting and Welding in a Single Machine with a Single Tool
    Authors:
    Dirk Petring, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Frank Schneider, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Christian Benter, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Reinhart Poprawe, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Presented at ICALEO 2005

    There is a wide spectrum of laser processes, including removal, joining and surface treatment of matter, most of them well known to be productive, precise and last but not least flexible. This flexibility ...

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  • ICALEO 2005 Paper #2101 (Importance of the Coupling Between the Induced Vapor Plume and the Melt Pool, for Nd-Yag CW Laser Welding)

    Importance of the Coupling Between the Induced Vapor Plume and the Melt Pool, for Nd-Yag CW Laser Welding
    Authors:
    Remy Fabbro, LALP (CNRS) / Gip Gerailp; Arcueil Cedex France
    Francis Briand, Air Liquide - CTAS; St OUEN L4AUMONE France
    Sonia Slimani, Air Liquide - CTAS; St OUEN L'AUME France
    Frederic Coste, LALP (CNRS) / Gip Gerailp; Arcueil France
    Presented at ICALEO 2005

    We have analyzed the effect of the induced vapor plume on the metallic pool during CW laser welding. We used diagnostics based on fast video imaging (4 kHz frame rate) of the vapor jet, the melt pool surface and the keyhole geometry (front wall inclination and the top and bottom dimen...

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  • ICALEO 2005 Paper #2102 (The Rapid Manufacture of Micro Hierarchical Structures by Selective Laser Melting)

    The Rapid Manufacture of Micro Hierarchical Structures by Selective Laser Melting
    Authors:
    Chris Sutcliffe, The University of Liverpool; Liverpool UK
    J. Todd, The University of Liverpool; Liverpool Great Britain
    P. Fox, The University of Liverpool; Liverpool Great Britain
    W. Brooks, The University of Liverpool; Liverpool Great Britain
    W. Cantwell, The University of Liverpool; Liverpool Great Britain
    R. Mines, The University of Liverpool; Liverpool Great Britain
    Presented at ICALEO 2005

    The Selective Laser Melting (SLM) process produces components using high melting point metal powders. This gives the ability to produce high-perfor...

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  • ICALEO 2005 Paper #2103 (Theoretical Study of Aerodynamic Behaviour of Assist Gas During Laser Cutting)

    Theoretical Study of Aerodynamic Behaviour of Assist Gas During Laser Cutting
    Authors:
    Ruslan Zhuk, NTUU 'KPI'; Kyiv Ukraine
    Volodymir Kovalenko, Laser Technology Research Institute; Kyiv Kyiv Region Ukraine
    Presented at ICALEO 2005

    Cutting is one of the major laser applications which is extensively used nowadays due to its flexibility, accuracy and non-mechanical contact between laser beam and workpiece. Despite numerous experimental and theoretical investigations on dross and striations formation, which are significant factors influencing laser cutting quality, the understanding of these mechanisms leaves much to be desired. Modeling of laser cutting process can shed light on th...

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