Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    Hybrid laser arc welding of X80 and X120 steel grade
    ( 2014)
    Gook, Sergej
    ;
    Gumenyuk, Andrey
    ;
    Rethmeier, Michael
    The aim of the present work was to investigate the possibilities of hybrid laser arc welding regarding reliable production of longitudinal welds of high strength pipe steels X80 and X120 and to evaluate achievable mechanical properties of laser hybrid welds. The study focused on weld toughness examination in low temperature range. Suitable filler materials were identified in the context of this task. It could be shown that metal cored electrodes guaranteed sufficient Charpy impact toughness at low temperature for both investigated materials. Modern arc welding technologies such as modified pulsed spray arc were used to promote deeper penetration of the filler material into the narrow laser welding gap. Edge preparation with a 14 mm deep root face was considered as optimum, because no penetration of the filler material could be detected beyond this depth limit, and therefore, any metallurgical influences on the weld metal properties through the welding wire could be excluded.
  • Publication
    Laser-hybrid welding for pipe production and pipe laying of thick large diameter pipes
    ( 2013)
    Rethmeier, Michael
    ;
    Gumenyuk, Andrey
    ;
    Gook, Sergej
    New brilliant high-power lasers such as disc laser and fibre laser open up new fields of applications for laser-hybrid welding, e.g. power generation, shipbuilding and pipeline construction. To a large extend, longitudinally welded large-diameter pipes are used for modern oil- und gas-pipelines. New material trends are high strength steel grades API-X80 or higher. For the production of such pipes a large plate is first formed to an open ring. Subsequent, it is continuously tacked by means of metal active gas (GMA) welding process. The remaining double-sided joint gaps are filled up by cost-intensive multiple-wire submerged arc welding (SAW) processes. For reasons of economy the GMA tackweld process can be replaced by the laser-GMA-hybrid welding process, whereby as primary objective sufficient weld metal toughness for low temperature applications down to 60C is pursued. Results are discussed in the light of achievable toughness of the welded joints and their accordance with the requirements demanded in the standards. It could be shown that the penetration depth of filler material is rather independent of the kind of arc used and does not exceed 13 mm. A second interesting aspect is the use of laser-hybrid welding in pipe laying, insensibility towards tolerances and the possibility of orbital welding are very important factors in addition to the weld seam quality. First promising results for laser-hybrid welding of thick materials could be demonstrated. Half-orbital welds could be demonstrated for a single pass weld in 16 mm thick large-diameter pipes.
  • Publication
    Prospects of application of laser-GMA hybrid welding for manufacturing of large diameter longitudinal welded high strength steel pipes
    ( 2013)
    Gook, Sergej
    ;
    Gumenyuk, Andrey
    ;
    Rethmeier, Michael
    The aim of the present work was to investigate the possibilities of hybrid laser arc welding regarding reliable production of longitudinal welds of high strength pipe steels X80 and X120 and to evaluate achievable mechanical properties of laser hybrid welds. The study focused on weld toughness examination in low temperature range up to 260uC. Suitable filler materials were identified in the context of this task. It could be shown that metal cored electrodes guaranteed sufficient Charpy impact toughness at low temperature for both investigated materials. Modern arc welding technologies such as modified pulsed spray arc were used to promote deeper penetration of the filler material into the narrow laser welding gap. Edge preparation with a 14 mm deep root face was considered as optimum, because no penetration of the filler material could be detected beyond this depth limit, and therefore, any metallurgical influences on the weld metal properties through the welding wire could be excluded.
  • Publication
    High power laser beam welding
    ( 2013)
    Gook, Sergej
    ;
    Gumenyuk, Andrey
    ;
    Rethmeier, Michael
    To a large extend, longitudinally welded large-diameter pipes are used for modern oil- und gas-pipelines. New material trends are high strength steel grades API-X80 or higher. For the production of such pipes a large plate is first formed to an open ring. Subsequent, it is continuously tacked by means of metal active gas (GMA) welding process. The remaining double-sided joint gaps are filled up by cost-intensive multiple-wire submerged arc welding (SAW) processes. For reasons of economy the GMA tackweld process can be replaced by the laser-GMA-hybrid welding process, whereby as primary objective sufficient weld metal toughness for low temperature applications down to -60°C is pursued. Results are discussed in the light of achievable toughness of the welded joints and their accordance with the requirements demanded in the standards. It could be shown that the penetration depth of filler material is rather independent of the kind of arc used and does not exceed 14 mm. A second interesting aspect is the use of laser-hybrid welding in pipe laying, insensibility towards tolerances and the possibility of orbital welding are very important factors in addition to the weld seamquality. First promising results for laser-hybrid welding of thick materials could be demonstrated. Half-orbital welds could be demonstrated for a single pass weld in 16 mm thick large-diameter pipes.