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Properties of laser hybrid butt welds of 420 MPa steel


Laser hybrid welding has been used in European shipbuilding for many years due to its high productivity. In order to qualify the process for the oil and gas industry, an extensive welding and testing programme is needed, and the properties must satisfy more severe requirements than in shipbuilding. This is particularly the case when these activities are moving to the Arctic regions, where low temperature toughness may be the primary challenge. The present investigation addressed preliminary welding trials carried out with 15 kW fibre laser-gas metal arc (GMA) hybrid welding using double Y joint of 20 mm thick 420 MPa steel plates. Both Charpy V notch impact and CTOD fracture mechanical testing were included at 40 and 30°C, respectively. The results indicate that the heat affected zone (HAZ) of the examined steel appeared with satisfactory toughness (> 200 J, > 0.2 mm) while the employed weld metal had insufficient impact properties. The weld metal CTOD toughness approached 0.2 mm. With a better welding wire, designed for low temperature applications, it is reasonable to suggest that laser hybrid arc welding can be used for applications even below 30 to 40°C.


Academic literature review




  • Odd Magne Akselsen
  • Greger Wiklund
  • Erling Østby
  • Arve Sørgjerd
  • Alexander Kaplan


  • Norwegian University of Science and Technology
  • SINTEF Industry / Materials and Nanotechnology
  • Luleå University of Technology
  • Diverse norske bedrifter og organisasjoner



Published in

ISOPE - International Offshore and Polar Engineering Conference. Proceedings




International Society of Offshore & Polar Engineers


290 - 294

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