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High power laser beam welding

: Gook, Sergej; Gumenyuk, Andrey; Rethmeier, Michael

Ossenbrink, R.:
Internationales Symposium Schweißtechnik - Verfahren, Werkstoffe, Simulation 2013 : 6. November 2013, Cottbus; Anlässlich des 60. Geburtstages von Vesselin Michailov
Aachen: Shaker, 2013 (Berichte des Lehrstuhls Füge- und Schweißtechnik der BTU Cottbus-Senftenberg 4)
ISBN: 978-3-8440-2319-0
Internationales Symposium Schweißtechnik - Verfahren, Werkstoffe, Simulation <2013, Cottbus>
Conference Paper
Fraunhofer IPK ()
high strength steels; laser hybrid welding; longitudinal weld; pipeline

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.