Temperature gradients at the solidification front of deep hybrid laser welds

Farhang Farrokhi*, Benny Endelt, Rasmus S. Andersen, Morten Kristiansen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Grain refinement and the avoidance of columnar solidification is a great challenge in the deep penetration laser welds of thick-section steels. Further knowledge about the heat distribution and the temperature gradients in laser welds is vital for future attempts on the grain refinement of such welds. In this study, a comparative investigation was carried out for full and partial penetration hybrid laser welding of structural steel. The transient temperature distribution and temperature gradients were calculated for the experiments using a simplified three-dimensional finite element analysis. A comparative analysis was presented to investigate the influence of penetration mode on the temperature gradient in the liquid at different weld depths. The results of the numerical analysis suggested that, for given welding process parameters, full penetration welds have lower temperature gradients at the solidification front, meaning that they potentially have a higher chance of grain refinement, compared with partial penetration welds.

Original languageEnglish
Article number051005
JournalJournal of Manufacturing Science and Engineering, Transactions of the ASME
Volume143
Issue number5
Number of pages11
ISSN1087-1357
DOIs
Publication statusPublished - May 2021

Bibliographical note

Publisher Copyright:
Copyright © 2020 by ASME

Keywords

  • Grain refinement
  • Hot crack
  • Laser welding
  • Numerical modeling
  • Penetration mode
  • Solidification

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