In situ strain investigation during laser welding using digital image correlation and finite-element-based numerical simulation

G. Agarwal, H. Gao, M. Amirthalingam, M. J.M. Hermans

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)
57 Downloads (Pure)

Abstract

In situ strain evolution during laser welding has been measured by means of digital image correlation to assess the susceptibility of an advanced high strength automotive steel to solidification cracking. A novel method realised using auxiliary illumination and optical narrow bandpass filter allowed strain measurements as close as 1.5 mm from the fusion boundary with good spatial and temporal resolution. A finite-element thermomechanical model of the welding process supports the experimentally measured transverse strain. The validated finite-element numerical model can be used to assess the local strain and associated stress conditions which influences weldability and in particular, solidification cracking.

Original languageEnglish
Pages (from-to)134-139
JournalScience and Technology of Welding and Joining
Volume23
Issue number2
DOIs
Publication statusPublished - 2018

Keywords

  • digital image correlation
  • FEM
  • In situ strain
  • laser welding
  • weld defects

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