• ICALEO 2010 Paper #1904 (Welding with High Brilliance Lasers and Great Power Density)

    Welding with High Brilliance Lasers and Great Power Density
    Authors:
    Andreas Patschger, University of Applied Science Jena; Jena Germany
    Markus Franz, University of Applied Science Jena; Jena Germany
    Jens Bliedtner, University of Applied Science Jena; Jena Germany
    Jean-Pierre Bergmann, JENOPTIK Automatisierungstechnik GmbH Jena; Jena Germany
    Presented at ICALEO 2010

    The increasing demand on efficient and powerful lasers let the market for fiber- and disc-lasers still grow. These systems include a high brilliance and so for the ability to realize very small foki or a long focal length.
    In this research phenomenological analysis were done to figure out the ...

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  • ICALEO 2010 Paper #1905 (LASER WELDING PARAMETERS EFFECTS ON AUSTENITIC STAINLESS STEELS WELDS MICROSTRUCTURE)

    LASER WELDING PARAMETERS EFFECTS ON AUSTENITIC STAINLESS STEELS WELDS MICROSTRUCTURE
    Authors:
    Joonas Pekkarinen, Lappeenranta University of Technology; Lappeenranta Finland
    Veli Kujanpää, Lappeenranta University of Technology; VTT- Technical Research Centre of Finland; Lappeenranta Finland
    Presented at ICALEO 2010

    This study is focused to determine empirically, which microstructural changes occur in austenitic stainless steels when heat input is controlled by welding parameters. Test welds were done bead-on-plate without shielding gas using 5 kW fiber laser. In this study austenitic stainless steels used were 1.4372 (AISI 201), 1.4404 (AISI 316L)and 1.4547 (high-alloyed 6 % Mo). ...

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  • ICALEO 2010 Paper #1906 (Laser Welding: the Spatter Map)

    Laser Welding: the Spatter Map
    Authors:
    Alexander F. H. Kaplan, Lulea University of Technolog, Dept. TFM; Lulea Sweden
    John Powell, Laser Expertise Ltd.; Nottingham Great Britain
    Presented at ICALEO 2010

    Spatter is among the main welding defects, causing deposited droplets as well as underfill or craters. Despite several successful measures to suppress spatter and some discoveries on the mechanism, a systematic guideline as well as a closed theory on spatter is missing, but desired. The paper presents several approaches to categorize spatter experiences in a systematic, extendable manner. Some of them where applied for the 46 literature entries found. From high speed imaging quanti...

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  • ICALEO 2010 Paper #1908 (Welding of Dissimilar Materials with a 1kW Fiber Laser)

    Welding of Dissimilar Materials with a 1kW Fiber Laser
    Authors:
    Mohammed Naeem, JK Lasers; Rugby Great Britain
    Richard Jessett, JK Lasers; Rugby Great Britain
    Kevin Wither, JK Lasers; Rugby Great Britain
    Presented at ICALEO 2010

    Majority of applications in a range of industries i.e. automotive, electronics, medical devices etc requires welding of dissimilar materials. In principle, a laser can weld any material, which can be joined by conventional processes. In the welding of dissimilar metals, good solid solubility is essential for sound weld properties. The trends of welding dissimilar metals are offering high challenges for welding methods. The weldability of dissi...

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  • ICALEO 2010 Paper #1909 (Measuring Process Speed at Tool Center Point)

    Measuring Process Speed at Tool Center Point
    Authors:
    Christoph Franz, Fraunhofer ILT; Aachen Germany
    Peter Abels, Fraunhofer Institute for Laser Technology; Aachen Germany
    Presented at ICALEO 2010

    Advancing laser sources enable manufacturers to produce weld seams of high quality and at high process velocities. These processes require high degrees of precision and furthermore, process parameters have to be kept in close limits. The welding velocity is the most important parameter among laser power which has to be held constantly in order to achieve a stable quality of the manufactured products. Only a stable energy input per unit length may ensure a steady quality of the welded sea...

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  • ICALEO 2010 Paper #201 (Utilizing of Laser-GMA Hybrid Welding in Industrial Application)

    Utilizing of Laser-GMA Hybrid Welding in Industrial Application
    Authors:
    Jukka Siltanen, Rautaruukki Oyj; Fl-1330 Hämeenlinna Finland
    Presented at ICALEO 2010

    The use of ultra high strength steel (UHSS) is increasing in the engineering industry and many steel manufacturers are focusing more on its production. It is easy to predict that the trend is to have even higher strength steel available on the market. Further processing of UHSS needs special attention, espe-cially the bending and welding of it can be very challenging. Typical applications in heavy engineering where the use of UHSS brings clear benefits are in the structures of load handling and transportation ve-hicles and lifting equipm...

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  • ICALEO 2010 Paper #202 (Weld Seam Formation and Mechanical Properties of Girth Welds Performed with Laser-GMA-Hybrid Process on Pipes of Grade X65)

    Weld Seam Formation and Mechanical Properties of Girth Welds Performed with Laser-GMA-Hybrid Process on Pipes of Grade X65
    Authors:
    Sergej Gook, BAM, Federal Institute for Materials Research and Testing; Berlin Germany
    Andrey Gumenyuk, BAM, Federal Institute for Materials Research and Testing; Berlin Germany
    Michael Rethmeier, BAM, Federal Institute for Materials Research and Testing; Berlin Germany
    Presented at ICALEO 2010

    With the recent introduction of multi-kilowatt fiber lasers combining high beam quality with an impressive energy efficiency, it was possible to broaden the spectrum of laser beam and laser-hybrid welding applications widely.
    A girth laser-hybrid p...

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  • ICALEO 2010 Paper #203 (HyDRA and LUPus - the Exotics Among the Hybrid Welding Method)

    HyDRA and LUPus – the Exotics Among the Hybrid Welding Method
    Authors:
    Uwe Reisgen, Rwth Aachen University - Welding and Joining Institute (Isf); Aachen Germany
    Simon Olschok, Rwth Aachen University - Welding and Joining Institute (Isf); Aachen Germany
    Stefan Jakobs, Rwth Aachen University - Welding and Joining Institute (Isf); Aachen Germany
    Michael Mavany, Rwth Aachen University - Welding and Joining Institute (Isf); Aachen Germany
    Presented at ICALEO 2010

    For a reduction of manufacturing time but also for the creation of extended possibilities with innovative applications, known and well-established processes are joined towards one new method. Example...

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  • ICALEO 2010 Paper #205 (Process Monitoring and Control during Hybrid Laser-Arc Welding of Medium Section Steel Sheets)

    Process Monitoring and Control during Hybrid Laser-Arc Welding of Medium Section Steel Sheets
    Authors:
    Wolfgang Fiedler, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Alexander Drenker, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Stefan Kaierle, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Presented at ICALEO 2010

    In current manufacturing, conventional arc welding processes, such as MIG/MAG and submerged arc welding, are mainly used to produce joints of metal sheets over a wide range of materials and wall thicknesses. Yet the manufacturers are facing problems like a low productivity and reliance on the skill of operat...

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  • ICALEO 2010 Paper #301 (Numerical Investigation of the Effect of the Pulse Format on Drilling Performance)

    Numerical Investigation of the Effect of the Pulse Format on Drilling Performance
    Authors:
    Joonghan Shin, Center for Lasers and Plasmas for Advanced Manufacturing University of Michigan; Ann Arbor MI USA
    Jyoti Mazumder, Center for Lasers and Plasmas for Advanced Manufacturing University of Michigan; Ann Arbor MI
    Presented at ICALEO 2010

    Numerical simulation for pulsed laser drilling is carried out to develop the fundamental understanding of the high power density laser process. The model used in this study adopted mathematical scheme called the level-set technique to capture the transient liquid-vapour interface during the laser-material interaction. The model has the capabilitie...

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