In situ strain and temperature measurement and modelling during arc welding. (18th March 2015)

• Record Type: Journal Article
• Authors: Chen, J.; Yu, X.; Miller, R. G.; Feng, Z.
• Is Part Of: Science and technology of welding & joining. Volume 20:Number 3(2015:Apr.)
• Page Start: 181
• Page End: 188
• Publication Date: 2015-03-18
• Subjects: Welding -- Periodicals; Joints (Engineering) -- Periodicals; Surfaces (Technology) -- Periodicals; 671.52
• DOI: 10.1179/1362171814Y.0000000270
• Languages: German
• ISSNs: 1743-2936

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>Experiments and numerical models were applied to investigate the thermal and mechanical behaviours of materials adjacent to the weld pool during arc welding. In the experiment, a new high temperature strain measurement technique based on digital image correlation (DIC) was developed and applied to measure the <italic>in situ</italic> strain evolution. In contrast to the conventional DIC method that is vulnerable to the high temperature and intense arc light involved in fusion welding processes, the new technique utilised a special surface preparation method to produce high temperature sustaining speckle patterns required by the DIC algorithm as well as a unique optical illumination and filtering system to suppress the influence of the intense arc light. These efforts made it possible for the first time to measure <italic>in situ</italic> the strain field 1 mm away from the fusion line. The temperature evolution in the weld and the adjacent regions was simultaneously monitored by an infrared camera. Additionally, a thermal–mechanical finite element model was applied to substantiate the experimental measurement.</p> </abstract>