• 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 #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 #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 #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 #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 #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 #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 #1903 (Effect of Heat Input Modification on Duplex Stainless Weld Quality)

    Effect of Heat Input Modification on Duplex Stainless Weld Quality
    Authors:
    Antti Salminen, Laser processing research group, Lappeenranta University of Technology; Lappeenranta Finland
    Elin Westin, Outokumpu Corporation; Avesta
    Presented at ICALEO 2010

    Laser welding is a perfect tool for welding of different steel grades especially stainless steel. Laser welding is often used as autogenous keyhole welding process that provides narrow deep penetration with good weld quality. New lasers offer excellent beam quality and high power via optical fiber that typically leads into improvement of welding speed. Even though increased speed increases productivity it also increases cooling rate...

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  • ICALEO 2010 Paper #1902 (Laser Welding of Tube to Tube-Sheet Joint in Steam Generators for Nuclear Power Plants)

    Laser Welding of Tube to Tube-Sheet Joint in Steam Generators for Nuclear Power Plants
    Authors:
    Rosa Arias, Aimen Technology Centre; PorriñO, Pontevedra Spain
    Eva Vaamonde, Aimen Technology Centre; Porrino Spain
    Ambroise VandewynckèLe, Aimen Technology Centre; PorriñO, Pontevedra Spain
    Enrique Piñeiro, Aimen Technology Centre; PorriñO, Pontevedra Spain
    Pedro Verón, Equipos Nucleares S.A.; MaliañO, Cantabria Spain
    Presented at ICALEO 2010

    Nowadays tube to tube-sheet joints are usually welded by TIG orbital welding process. This process is characterized by very high quality of the weld beads and good repeatability. These aspects are very ...

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  • ICALEO 2010 Paper #1901 (Parameter Selection in Laser Welding using the Power Factor Concept)

    Parameter Selection in Laser Welding using the Power Factor Concept
    Authors:
    Wojciech Suder, Cranfield University; Cranfield Great Britain
    Stewart Williams, Cranfield University; -
    Presented at ICALEO 2010

    To achieve specific penetration depths in laser welding particular combinations of laser power and travel speed are required. Different combinations of power and travel speed can be used to obtain the same penetration depth. Further, for a given combination a different penetration depth occurs if a different spot size is used. Spot size is controlled by the laser properties and the optical system, and varies between laser systems. This causes difficulties in both selecting opt...

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