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

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    9 Citations (Scopus)
    93 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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