• ICALEO 2008 Paper #1203 (Experimental Test Set-up for Studying Hot Cracking in Multi Pass Laser Hybrid Welding of Thick Section Austenitic Stainless Steel)

    Experimental Test Set-up for Studying Hot Cracking in Multi Pass Laser Hybrid Welding of Thick Section Austenitic Stainless Steel
    Authors:
    Miikka Karhu, VTT- Technical Research Centre of Finland; Lappeenranta Finland
    Veli Kujanpaa, VTT- Technical Research Centre of Finland / Lappeenranta University of Technology; Lappeenranta Finland
    Presented at ICALEO 2008

    Although the austenitic stainless steel grades are commonly considered to be quite an easy weldable, there are certain applications which make exception to above statement. As an example, which has also attributed to this study, it could be mentioned a welded assembly which forms a very rigid structure. In above mentioned struc...

    $28.00

  • ICALEO 2008 Paper #1204 (Fiber Laser Hybrid Welding of Stainless Steels)

    Fiber Laser Hybrid Welding of Stainless Steels
    Authors:
    Anna Fellman, Weldcon; Lappeenranta Finland
    Elin Westin, Outokumpu Stainless; Avesta Sweden
    Presented at ICALEO 2008

    Laser welding gives better penetration than conventional welding methods and can significantly increase the welding speed. Use of laser hybrid welding can further enhance the welding speed by improving gap bridgeability and allowing the addition of filler metal to facilitate welding of special grades. Fiber laser gas-metal arc (GMA) hybrid welding was performed on 8 mm austenitic 316L (EN 1.4404/ 1.4432, UNS S316L) and duplex 2205 (EN 1.4462, UNS S31805) stainless steel with the recommended filler wires. Both le...

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  • ICALEO 2008 Paper #1301 (Custom Beam Shaping for High-Power Fiber Laser Welding)

    Custom Beam Shaping for High-Power Fiber Laser Welding
    Authors:
    Brian Victor, EWI; Columbus OH USA
    Craig T. Walters, Craig Walters Associates; Powell OH USA
    Stan Ream, Ewi; Columbus OH USA
    Presented at ICALEO 2008

    With the ever increasing power and performance of fiber lasers, autogenous laser welding is becoming more practical for thick-section welding applications. High-power, high beam quality lasers can produce high aspect ratio welds at productive travel speeds with minimal distortion. However, autogenous laser welding can produce undercutting or other geometric stress concentrations at the weld toes. Through the design of custom optics, the laser beam can be d...

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  • ICALEO 2008 Paper #1302 (Temporal Behaviour of the Focal Shift of Beam Forming Optics for High Power Single Mode Lasers)

    Temporal Behaviour of the Focal Shift of Beam Forming Optics for High Power Single Mode Lasers
    Authors:
    Axel Hess, Forschungsgesellschaft fuer Strahlwerkzeuge FGSW; Stuttgart Germany
    Felix Abt, Forschungsgesellschaft fuer Strahlwerkzeuge FGSW; Stuttgart Germany
    Friedrich Dausinger, Forschungsgesellschaft fuer Strahlwerkzeuge FGSW; Stuttgart Germany
    Presented at ICALEO 2008

    New generations of thin disk and fibre lasers are combining excellent beam quality typically having M² between 1.2 and approximately 8 with kilowatts of output power. This combination of power and beam quality brings the imaging performance of beam-forming optics into focus. Former research ...

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  • ICALEO 2008 Paper #1303 (Development of Computer Generated Hologram for Laser Processing of a High Power Diode Laser)

    Development of Computer Generated Hologram for Laser Processing of a High Power Diode Laser
    Authors:
    Hideki Hagino, Technology Research Institute of Osaka Prefecture; Izumi Japan
    Hikaru Ando, Osaka Prefecture University; Sakai Japan
    Hisao Kikuta, Osaka Prefecture University; Sakai Japan
    Presented at ICALEO 2008

    A computer generated hologram (CGH) has been designed and fabricated for laser transformation hardening with a high-power diode laser. A laser intensity distribution to obtain a uniform hardened depth in a steel plate has been determined by the three-dimensional dynamic thermal analysis based on the finite element method. The optimized laser intensity distributi...

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  • ICALEO 2008 Paper #1304 (Low Loss Field-Mapped Laser Beam Homogenizer)

    Low Loss Field-Mapped Laser Beam Homogenizer
    Authors:
    Michael Scaggs, Neoteric Concepts; Weston FL USA
    Nadeem Rizvi, Laser Micromachining Limited; Denbighshire Great Britain
    Andrew Goater, Laser Micromachining Limited; Denbighshire Great Britain
    Gary Owen, Laser Micromachining Limited; Denbighshire Great Britain
    Gilbert Haas, Haas Laser Technologies, Inc.; Flanders NJ USA
    Presented at ICALEO 2008

    A new type of laser beam homogenizer has been developed which field-maps an illumination by using spherical, cylindrical, axicon or prism optical segments, or in some applications combination of these various elements, and placing the optical se...

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  • ICALEO 2008 Paper #1305 (Flexible 3-D - Laser Cutting and Welding with the Combi-Head)

    Flexible 3-D - Laser Cutting and Welding with the Combi-Head
    Authors:
    Frank Schneider, Fraunhofer Institut Lasertechnik; Aachen Germany
    Dirk Petring, Fraunhofer Institut Lasertechnik; Aachen Germany
    Presented at ICALEO 2008

    Integrated manufacturing with the laser combi-head allows to perform cutting and welding operations with a single tool. Thus an arbitrary and instantaneous change of processes becomes possible. First industrial applications demonstrate flexible production with technical and economical advantages resulting from shorter process chains, and higher accuracy by using a single tool center point for both processes. This even supersedes seam tracking. Besides 2D-applica...

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  • ICALEO 2008 Paper #1401 (Inductively Supported Laser Beam Welding of High and Ultra High Strength Steel Grades)

    Inductively Supported Laser Beam Welding of High and Ultra High Strength Steel Grades
    Authors:
    Ronny Pfeiffer, Laser Zentrum Hannover E.V.; Hannover Germany
    Katrin Harley, Laser Zentrum Hannover e.V.; Hannover Germany
    Heinz Haferkamp, Laser Zentrum Hannover e.V.; Hannover Germany
    Andreas Ostendorf, Laser Zentrum Hannover E.V.; Hannover Germany
    Dirk Herzog, Laser Zentrum Hannover E.V.; Hannover Germany
    Peter Kallage, Laser Zentrum Hannover E.V.; Hannover Germany
    Presented at ICALEO 2008

    Sustainability, weight reduction and reduction of CO2-emissions are the key words when it comes to car body construction. The EU-Project "Sustainab...

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  • ICALEO 2008 Paper #1402 (Study of Laser Lap Joining of Zinc Coated Sheet Steel Without a Preset Gap)

    Study of Laser Lap Joining of Zinc Coated Sheet Steel Without a Preset Gap
    Authors:
    I. M. Richardson, Delft University of Technology; Delft Netherlands
    Y. Pan, Materials Innovation Institute; Delft Netherlands
    Presented at ICALEO 2008

    Laser beam welding has been used for joining zinc coated steel in automotive industry. However, it is still a great challenge to weld coated steel in overlap configuration because of the low boiling temperature of the zinc compared with the melting temperature of the steel. To date welding is normally undertaken when a gap is present between the plates, introduced prior to welding, or when welding with a modified laser beam, such as using elongated or...

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  • ICALEO 2008 Paper #1403 (Diode Laser Correction of Spring Back Effect in Forming Process of Galvanized Dual Phase Steels for Automotive Application)

    Diode Laser Correction of Spring Back Effect in Forming Process of Galvanized Dual Phase Steels for Automotive Application
    Authors:
    Pablo Romero, Aimen Metallurgical Research Society. Laser Application Center.; Porrino (Pontevedra) Spain
    Francisco Rodríguez , Aimen Metallurgical Research Society. Laser Application Center; Porri�O (Pontevedra) Spain
    Jacobo Otero, Aimen; Porrino Spain
    Joaquín Vázquez, Aimen; Porrino Spain
    Gemma Prada, Seat Sa; Barcelona Spain
    Idoya Pascual, Gestamp Automocion; Sant Esteve Sesrovires (Barcelona) Spain
    Presented at ICALEO 2008

    The stringent environmental, safety and economic regulations in autom...

    $28.00

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