Single-Pass Laser-GMA Hybrid Welding of 13.5 mm Thick Duplex Stainless Steel

  • Single-pass solid-state laser welding of plates in the thickness range of 10 to 20 mm became possible with the invention of the fibre laser. This new technique provides excellent beam quality at powers as high as 20 kW or more, and has proved applicable in several industrial applications. By replacing conventional methods with the fibre laser, it is possible to avoid multiple-pass welding that requires time-consuming bevelling. The high energy density of the fibre laser beam also reduces the heat input and consequently the distortion. However, the rapid solidification and cooling associated with laser welding can cause imbalance of the microstructure of duplex stainless steel weldments, where excessively high ferrite contents may reduce the corrosion resistance and the ductility of the material. The solution is normally to add nickel-based filler wire and to increase the heat input. By using a hybrid welding process where the laser beam and the gas metal arc (GMA) process act in aSingle-pass solid-state laser welding of plates in the thickness range of 10 to 20 mm became possible with the invention of the fibre laser. This new technique provides excellent beam quality at powers as high as 20 kW or more, and has proved applicable in several industrial applications. By replacing conventional methods with the fibre laser, it is possible to avoid multiple-pass welding that requires time-consuming bevelling. The high energy density of the fibre laser beam also reduces the heat input and consequently the distortion. However, the rapid solidification and cooling associated with laser welding can cause imbalance of the microstructure of duplex stainless steel weldments, where excessively high ferrite contents may reduce the corrosion resistance and the ductility of the material. The solution is normally to add nickel-based filler wire and to increase the heat input. By using a hybrid welding process where the laser beam and the gas metal arc (GMA) process act in a common process zone, filler metal can be added to the molten pool at higher heat input and at the same time, higher welding speed and deeper penetration can be achieved. In this work, 13.5 mm thick 2205 (EN 1.4462, UNS S31803) was fibre laser-GMA hybrid welded in a single-pass using 14 kW of laser power and 2209 (ISO 22 9 3 L N) as filler wire for the GMA process. The resulting welds were free from defects, with smooth surfaces and full penetration. The investigation examines the weld metal microstructure and the effect on corrosion resistance and mechanical properties. The option to add nickel foil when hybrid welding was also investigated as comparison and the effect on austenite formation was evaluated.zeige mehrzeige weniger

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Metadaten
Autor*innen:E. M. Westin, Karen Stelling, Andrey GumenyukORCiD
Persönliche Herausgeber*innen: P. Mayr, G. Posch, H. Cerjak
Dokumenttyp:Beitrag zu einem Sammelband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):61st Annual Assembly and International Conference of the International Institute of Welding (IIW) "Safety and Reliability of Welded Components in Energy and Processing Industry" (Proceedings)
Jahr der Erstveröffentlichung:2008
Herausgeber (Institution):International Institute of Welding (IIW)
Verlag:Verlag der Technischen Universität Graz
Verlagsort:Graz, Austria
Ausgabe/Heft:IIW Doc.-No. IV-963-08
Erste Seite:1
Letzte Seite:13
Freie Schlagwörter:Austenite formation; Corrosion resistance; Duplex stainless srteel; EMPA; Laser hybrid welding; Laser welding; Weld metal; Weldability; Welding
Veranstaltung:61st Annual Assembly and International Conference of the International Institute of Welding (IIW) "Safety and Reliability of Welded Components in Energy and Processing Industry"
Veranstaltungsort:Graz, Austria
Beginndatum der Veranstaltung:2008-07-06
Enddatum der Veranstaltung:2008-07-11
URL:http://www.iiw-iis.org/iiw/extranet/static/Ms/C-IV/IV-963-08-Single-Pass-Laser-Gma-Hybrid-Welding.pdf
ISBN:978-3-85125-019-0
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
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