In situ strain investigation during laser welding using digital image correlation and finite-element-based numerical simulation |
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| Authors: | G Agarwal H Gao M Amirthalingam MJM Hermans |
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| Affiliation: | 1. Department of Materials Science and Engineering, Faculty of 3mE, Delft University of Technology, Delft, The Netherlands;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, India |
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| 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. |
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| Keywords: | In situ strain laser welding digital image correlation FEM weld defects |
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