• ICALEO 2010 Paper #1506 (Chances and Challenges Processing With High Brightness Lasers )

    Chances and Challenges Processing With High Brightness Lasers
    Authors:
    Thomas Seefeld, BIAS Bremer Institut für angewandte; Bremen Germany
    Presented at ICALEO 2010

    Solid state fiber and thin disk lasers offer high power and high beam quality. They provide the opportunity to overcome former limitations by achieving e.g. previously unattained processing speed and processing depth in laser beam welding, and offer yet unmatched process efficiency. This contribution highlights current work on some of the challenges associated with the application of high brightness systems, including thermally induced focus shift, single and multi passes thick section welding, pool stability at high welding sp...

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  • ICALEO 2010 Paper #1601 (Benefits from Combining Laser Beams with Different Wavelengths (Green and Ir) for Copper Welding)

    Benefits from Combining Laser Beams with Different Wavelengths (Green and Ir) for Copper Welding
    Authors:
    Axel Hess, Institut Strahlwerkzeuge IFSW, University of Stuttgart; Stuttgart Germany
    Andreas Heider, Institut Strahlwerkzeuge IFSW, University of Stuttgart; Stuttgart Germany
    Rainer Schuster, Institut Strahlwerkzeuge IFSW, University of Stuttgart; Stuttgart Germany
    Rudolf Weber, Institut Strahlwerkzeuge IFSW, University of Stuttgart; Stuttgart Germany
    Thomas Graf, Institut Strahlwerkzeuge IFSW, University of Stuttgart; Stuttgart Germany
    Presented at ICALEO 2010

    Due to its very good electric and thermal conductivity, copper is a fundamental...

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  • ICALEO 2010 Paper #1602 (Learning More About Laser Beam Welding by Applying It to Copper and Copper Alloys)

    Learning More About Laser Beam Welding by Applying It to Copper and Copper Alloys
    Authors:
    Dirk Petring, Fraunhofer-Institute for Laser Technology ILT; Aachen Germany
    Vahid Nazery Gonghany, Fraunhofer-Institute for Laser Technology ILT; Aachen Germany
    Presented at ICALEO 2010

    Welding of copper is generally considered to be difficult, particularly due to its high heat conductivity. During welding with high-power lasers the low absorptance of the near and even more the far IR wavelengths means an additional hurdle. Resulting back reflections can be hazardous for optics, beam guidance and laser source. On the other hand copper and its alloys gain in importance e.g. in view of the comi...

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  • ICALEO 2010 Paper #1603 (Laser Welding of Dissimilar Copper-Aluminum Connections by Means of Roll-Cladded Inserts)

    Laser Welding of Dissimilar Copper-Aluminum Connections by Means of Roll-Cladded Inserts
    Authors:
    Markus Weigl, Bayerisches Laserzentrum GmbH; Erlangen Germany
    Alexander Grimm, Bayerisches Laserzentrum GmbH; Erlangen Germany
    Thomas Frick, Bayerisches Laserzentrum GmbH; Erlangen Germany
    Michael Schmidt, Chair of Photonic Technologies, University of Erlangen-Nuernberg; Erlangen Germany
    Presented at ICALEO 2010

    Thermal welding processes of copper and aluminum often lead to insufficient connections due to an embrittlement and an unsatisfactory ductility of the melting zone. This embrittlement is caused by an extensive intermixture of the dissimilar base materi...

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  • ICALEO 2010 Paper #1604 (Analysis of Laser Welding of Long Fiber Reinforced Composites)

    Analysis of Laser Welding of Long Fiber Reinforced Composites
    Authors:
    C. Binetruy, Inst. Carnot Mines; Douai France
    A. Bueter, Fraunhofer-LBF; Darmstadt Germany
    P. Castaing, CETIM; Nantes Ced ex France
    S. Clement, CLFA, c/o Mines Paris Tech; Paris Cedex 6 France
    M. Deleglise, Inst. Carnot Mines; Douai France
    C. Franz, Fraunhofer Ilt; Aachen Germany
    A. Giessi, Fraunhofer-LBF; Darmstadt Germany
    Wolfgang Knapp, CLFA Fraunhofer ILT; Paris Cedex France
    M. Oumarou, Institute Carnot MINES, Mines ParisTech; Evry Cedex France
    J. Renard, Inst. Carnot Mines; Evry France
    A. Roeser, Frauhofer Ilt...

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  • ICALEO 2010 Paper #1605 (New Perspectives for the Absorber Free Laser Welding of Thermoplastics)

    New Perspectives for the Absorber Free Laser Welding of Thermoplastics
    Authors:
    Andrei Boglea, Fraunhofer Institute for Laser Technology; Aachen Germany
    Andreas Röesner, Fraunhofer Institute for Laser Technology; Aachen Germany
    Alexander Olowinsky, Fraunhofer Institute for Laser Technology; Aachen Germany
    Presented at ICALEO 2010

    Polymeric products play an important role in almost every facet of our lives and constitute a wide variety of products starting from everyday products up to high tech products in the automotive, electronics, aerospace, medical and other sectors. The possibility to fabricate complex shapes in various sizes provides design flexibility and high ...

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  • ICALEO 2010 Paper #1701 (A Thermo-Kinetic Phase Transformation Model for Multi-Pass Laser Heat Treatment by using High Power Direct Diode Laser)

    A Thermo-Kinetic Phase Transformation Model for Multi-Pass Laser Heat Treatment by using High Power Direct Diode Laser
    Authors:
    Soundarapandian Santhanakrishnan, Research Center for Advanced Manufacturing, Southern Methodist University; Dallas TX USA
    Fanrong Kong, Research Center for Advanced Manufacturing, Southern Methodist University; Dallas TX USA
    Radovan Kovacevic, Research Center for Advanced Manufacturing, Southern Methodist University; Dallas TX USA
    Presented at ICALEO 2010

    Nowadays, high-power direct diode laser (HPDDL) is successfully used in industry as a versatile tool for locally heat treating the metallic components. Laser phase transformation hardening (...

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  • ICALEO 2010 Paper #1702 (Local Laser Heat Treatment of Stainless Steel at Very High Speed)

    Local Laser Heat Treatment of Stainless Steel at Very High Speed
    Authors:
    Steffen Bonss, Fraunhofer IWS; Dresden Germany
    Jan Hannweber, Fraunhofer Iws; Dresden Germany
    Udo Karsunke, Fraunhofer Iws; Dresden Germany
    Stefan Kuehn, Fraunhofer Iws; Dresden Germany
    Marko Seifert, Fraunhofer Iws; Dresden Germany
    Eckhard Beyer, TU Dresden, Institute fuer Oberflaechen-und Fertigungstechnik Lot; Dresden Germany
    Presented at ICALEO 2010

    Laser beam heat treatment has been established during the last years as a complementary technology for local hardening treatment tasks at tool manufacturing and automotive industry. Especially new high power ...

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  • ICALEO 2010 Paper #1703 (Effect of Laser Surface Melting on Corrosion Behavior of Aged Duplex Stainless Steel)

    Effect of Laser Surface Melting on Corrosion Behavior of Aged Duplex Stainless Steel
    Authors:
    K.H. Lo, Department of Electromechanical Engineering, University of Macau; Macau Peoples Republic of China
    W.K. Chan, Department of Electromechanical Engineering, University of Macau; Macau Peoples Republic of China
    C.T. Kwok, Department of Electromechanical Engineering, University of Macau; Macau Peoples Republic of China
    Presented at ICALEO 2010

    Duplex stainless steels (DSSs) have been widely used as the structural components for chemical industries, oil and gas production and offshore applications due to its outstanding corrosion resistance in chloride-containing environmen...

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  • ICALEO 2010 Paper #1705 (Laser Polishing of Metallic Freeform Surfaces)

    Laser Polishing of Metallic Freeform Surfaces
    Authors:
    Roman Ostholt, Rwth Aachen University; Aachen Germany
    Edgar Willenborg, Fraunhofer Ilt; Aachen Germany
    Konrad Wissenbach, Fraunhofer Ilt; Aachen Germany
    Presented at ICALEO 2010

    Laser polishing represents a new surface finishing technique for sculptured work pieces which offers shorter process times and lower costs in comparison to the predominantly used manual polishing. The technique is based on remelting a thin surface layer by laser radiation. The surface tension of the melt pool induces a reallocation of material from the peaks to the valleys, thus creating a polished surface.
    When freeform surfaces are poli...

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