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Welding in the World

, Volume 60, Issue 5, pp 1001–1008 | Cite as

Numerical simulation of solidification crack formation during laser beam welding of austenitic stainless steels under external load

  • N. BakirEmail author
  • A. Gumenyuk
  • M. Rethmeier
Research Paper

Abstract

Solidification cracking phenomena taking place under controlled tensile weldability (CTW) test conditions have already been investigated both experimentally and numerically via FEA in order to get a better understanding of the mechanisms of hot crack formation during laser beam welding of austenitic steel grades. This paper develops a three-dimensional finite element model employing the contact element technique to simulate the formation and propagation of solidification cracks during laser full penetration welding of fully austenitic stainless steel 1.4376. During the experimental procedure, the resulting strain and displacement directed to the laser beam in the close vicinity of the weld pool was measured at the surface of the workpiece using a digital image correlation (DIC) technique with an external diode laser as an illuminating source. Local strain fields, global loads and crack lengths predicted by the model are in good agreement with those observed in experiments.

Keywords (IIW Thesaurus)

Solidification cracking Finite element analysis Imaging Laser welding Austenitic stainless steels Loading 

Notes

Acknowledgments

The authors would like to thank Karin Schlechter, Sören Hähnel and Thomas Paeschke who greatly contributed to the experimental part of the presented results.

Compliance with ethical standards

Funding

This work was supported by the Research Association for Steel Application (FOSTA), the Federation of Industrial Research Associations AiF, and the German Federal Ministry for Trade, Industry and Technology (BMWi Bundesministerium für Wirtschaft und Technologie) (Project 17781 N, ‘Development of a method for the investigation of hot cracking resistance of laser welded joints’).

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Copyright information

© International Institute of Welding 2016

Authors and Affiliations

  1. 1.BAM-Federal Institute for Material Research and TestingBerlinGermany

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