In situ strain investigation during laser welding using digital image correlation and finite-element-based numerical simulation. (17th February 2018)

• Record Type: Journal Article
• Authors: Agarwal, G.; Gao, H.; Amirthalingam, M.; Hermans, M.J.M.
• Is Part Of: Science and technology of welding & joining. Volume 23:Number 2(2018)
• Page Start: 134
• Page End: 139
• Publication Date: 2018-02-17
• Subjects: In situ strain -- laser welding -- digital image correlation -- FEM -- weld defects; Welding -- Periodicals; Joints (Engineering) -- Periodicals; Surfaces (Technology) -- Periodicals; 671.52
• DOI: 10.1080/13621718.2017.1344373
• Languages: English
• ISSNs: 1743-2936

Abstract

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.