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  4. Hybrid laser arc welding of thick high-strength pipeline steels of grade X120 with adapted heat input
 
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2020
Journal Article
Title

Hybrid laser arc welding of thick high-strength pipeline steels of grade X120 with adapted heat input

Abstract
The influence of heat input and welding speed on the microstructure and mechanical properties of single-pass hybrid laser arc welded 20 mm thick plates of high-strength pipeline steel X120 were presented. The heat input was varied in the range of 1.4 kJ mm-1 to 2.9 kJ mm-1, while the welding speed was changed between 0.5 m min-1 and 1.5 m min-1. A novel technique of bath support based on external oscillating electromagnetic field was used to compensate the hydrostatic pressure at low welding velocities. A major advantage of this technology is, that the welding speed and thus the cooling time t8/5 can be variated in a wide parameter window without issues regarding the weld root quality. The recommended welding thermal cycles for the pipeline steel X120 can be met by that way. All tested Charpy-V specimens meet the requirements of API 5 L regarding the impact energy. For higher heat inputs the average impact energy was 144 ± 37 J at a testing temperature of -40 °C. High heat input above 1.6 kJ mm-1 leads to softening in the weld metal and heat-affected-zone resulting in loss of strength. The minimum tensile strength of 915 MPa could be achieved at heat inputs between 1.4 kJ mm-1 and 1.6 kJ mm-1.
Author(s)
Üstündag, Ömer
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Gook, Sergej  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Gumenyuk, Andrey  
Rethmeier, Michael  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Journal
Journal of materials processing technology  
DOI
10.1016/j.jmatprotec.2019.116358
Language
English
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Keyword(s)
  • high-strength low-alloy steel

  • hybrid laser arc welding

  • mechanical-technological properties

  • microstructure

  • pipeline steel of grade X120

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