• ICALEO 2009 Paper #301 (Solutions for Lasers with High Brightness - A Deeper Look into Processing Heads for Welding and Cutting)

    Solutions for Lasers with High Brightness – A Deeper Look into Processing Heads for Welding and Cutting
    Authors:
    Markus Kogel-Hollacher, Precitec Optronik GmbH; Rodgau Germany
    Juergen Mueller-Borhanian, Precitec Kg; Gaggenau Germany
    Christian Staudenmaier, Precitec Kg; Gaggenau Germany
    Bert Schuermann, Precitec Kg; Gaggenau Germany
    Brad Trees, Precitec Inc.; Wixom MI USA
    Presented at ICALEO 2009

    Excellent beam qualities of the latest generation of laser sources like fibre and disc lasers in the region up to 2.5mm mrad and a laser power in the region of several kW enable new possibilities in laser materials processing. These constraints put h...

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  • ICALEO 2009 Paper #208 (Modification of the Electrochemical Properties of 2050-T8 Aluminium Alloys by a LSP Surface Treatment)

    Modification of the Electrochemical Properties of 2050-T8 Aluminium Alloys by a LSP Surface Treatment
    Authors:
    Patrice Peyre, LALP (CRNS)/GIP Gerailp, UPR 1578; PARIS France
    Vincent Vignal, ICB, UMR 5209 CNRS-Université de Dijon; - France
    Hassan Amar, ICB, UMR 5209 CNRS; - France
    Hongbin Song, LIM, UMR 8006 CNRS-Arts et Métiers; - France
    Hervé Pelletier, LGECO, EA 3938, INSA de Strasbourg; - France
    Vincent Ji, ICMMO/LEMHE, UMR CNRS 8182; - France
    Presented at ICALEO 2009

    2050 is a newly developed aeronautical AlLiCu aluminium alloys with numerous applications such as fuselage of civil aircrafts, and a good mechanical resistance...

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  • ICALEO 2009 Paper #206 (Texturing Structures of Ti Films by Multiple Femtosecond Laser Pulses)

    Texturing Structures of Ti Films by Multiple Femtosecond Laser Pulses
    Authors:
    Yongguang Huang, College of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
    Shibing Liu, College of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
    Presented at ICALEO 2009

    Femtosecond laser texturing has proved to be a particularly powerful method for creating a wide variety of surface structures on the metal films, such as a hollow microbump-nanojet sturcture and disk-column-nanodroplet structure on the gold films. The process of femtosecond laser texturing does not rely on material removal, but on hydrodynamic flow produced ...

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  • ICALEO 2009 Paper #205 (Laser-Generated Crack-Like Features for Fatigue Testing)

    Laser-Generated Crack-Like Features for Fatigue Testing
    Authors:
    Elizabeth Gounaris, Connecticut Center for Advanced Technology; East Hartford CT USA
    D. Cassioppo, -; -
    Paul Denney, Connecticut Center for Advanced Technology; East Hartford CT USA
    Presented at ICALEO 2009

    For several industries including aerospace, maritime, automotive and medical it is essential to develop a cost-effective, highly-reliable method to certify damage tolerances for fatigue-critical components. To certify materials for damage tolerances, they must have precise and repeatable artificial crack initiation sites in order to accurately measure fatigue deficits. At present, accepted methods of...

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  • ICALEO 2009 Paper #204 (Characterization and Compositional Study of Fibre Laser Processed Engineering Ceramics)

    Characterization and Compositional Study of Fibre Laser Processed Engineering Ceramics
    Authors:
    Pratik Shukla, Loughborogh University; Leicestershire Great Britain
    Jonathan Lawrence, Loughborough University; Leicestershire Great Britain
    Presented at ICALEO 2009

    Surface treatment by means of a CO2 laser and a fibre laser radiation was conducted on cold isostatic pressed (CIP) silicon nitride (Si3N4) and zirconia (ZrO2) engineering ceramics to observe changes in their characteristics, surface integrity, microstructure and composition. Scanning electron microscopy (SEM) was used to observe the integrity prior to and after laser processing. Energy dispersive X-ray (EDX) analysis was em...

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  • ICALEO 2009 Paper #202 (Laser Surface Treatment of Engineering Ceramics and the Effects Thereof on Fracture Toughness)

    Laser Surface Treatment of Engineering Ceramics and the Effects Thereof on Fracture Toughness
    Authors:
    Pratik Shukla, Loughborogh University; Leicestershire Great Britain
    J. Lawrence, -; -
    Presented at ICALEO 2009

    Surface treatment of Si3N4 and ZrO2 engineering ceramics with a CO2 laser and a fibre laser was conducted to identify changes in the fracture toughness (K1c). Vickers macro hardness indentation tests were employed prior to and after the laser treatment to investigate the near surface changes in the hardness of the engineering ceramics. Optical microscopy was then used to observe the near surface integrity, crack lengths and crack geometry within the engineering ceramics....

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  • ICALEO 2009 Paper #201 (Investigation into Time Dependant Degradation and Atmospheric Conditions on the Wettability of Nylon 6,6 which Has Undergone CO2 Laser Surface Modification)

    Investigation into Time Dependant Degradation and Atmospheric Conditions on the Wettability of Nylon 6,6 which Has Undergone CO2 Laser Surface Modification
    Authors:
    David Waugh, Loughborough University; Loughborough Great Britain
    Jonathan Lawrence, Loughborough University; Loughborough Great Britain
    D.J. Morgan, -; -
    Presented at ICALEO 2009

    Although CO2 lasers have been shown to be capable of modifying the wettability of polymeric materials, it is known that the CO2 laser induced wettability modifications of these materials can degrade over time. This can be seen to be crucial from a commercial point of view as this would indicate that a shelf-life has to be establis...

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  • ICALEO 2009 Paper #1910 (FOCAL SHIFT MONITORING AND COGNITIVE CLOSED-LOOP CONTROL BY ANALYSIS OF CO-AXIAL VIDEO DATA)

    FOCAL SHIFT MONITORING AND COGNITIVE CLOSED-LOOP CONTROL BY ANALYSIS OF CO-AXIAL VIDEO DATA
    Authors:
    Thibault Bautze, LDV, Technical Univ. of Munich; Munich Germany
    Tobias Kaiser, FSR, Technical Univ. of Darmstadt; - Germany
    Sonja Huber, IWB, Technical Univ. of Munich; Munich Germany
    Presented at ICALEO 2009

    Most laser welding heads offer the ability to connect a co-axial camera, using the same focusing lenses as the laser beam. Thus, the focal shift induced by heating the lenses and thus influencing the laser beam, alters the video data acquired. In the proposed approach, the sharpness of the video data is used to monitor the focal shift and distance changes relative ...

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  • ICALEO 2009 Paper #1908 (Comparison of Powder Additive Qualities with Regard to Achievable LMD Results)

    Comparison of Powder Additive Qualities with Regard to Achievable LMD Results
    Authors:
    Marco Goebel, Llt, Chair for Laser Technology Rwth Aachen; Aachen Germany
    Steffanie Linnenbrink, Llt, Chair for Laser Technology Rwth Aachen; Aachen Germany
    Ingomar Kelbassa, Llt, Chair for Laser Technology Rwth Aachen; Aachen Germany
    N. Ludwig, -; -
    Presented at ICALEO 2009

    Laser Metal Deposition (LMD) is a common technology used for local repairs and additive manufacturing of complete parts 3D applications such as aero engine and automotive components as well as for wear and corrosion protection of parts 2D cladding applications such as tools, dies, a...

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  • ICALEO 2009 Paper #1907 (Application of Holographic Beam Shaping in Selective Laser Melting for the Fabrication of Functional Polymer Components)

    Application of Holographic Beam Shaping in Selective Laser Melting for the Fabrication of Functional Polymer Components
    Authors:
    Darrel Bunyan, Loughborough University; Loughborough Great Britain
    Richard Heath, Loughborough University; Loughborough Great Britain
    John Tyrer, Loughborough University; Loughbrough Great Britain
    Matthew Gibson, Loughborough University; Loughborough Great Britain
    Presented at ICALEO 2009

    The applications of selectively laser sintered polymer components have been greatly limited by their poor mechanical properties as a result of high levels of residual porosity. This paper looks at the effects of using holographic beam shaping to...

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