Measurement of Strain During Tension Test of Welded Joint Using Multi-camera 3D Correlation System

This work concerns experimental research on the determination of deformation during uniaxial tension test of samples made of laser-arc hybrid welded joints. Steel sheet made of S355 steel with thickness 5 mm is butt-welded without gap using hybrid welding technique involving GMAW method with Yb:YAG laser beam. Samples used to the tension test are made from welded joints and base material. Universal strength machine Zwick&Roel Z100 is used with extensometer Multisens in all performed tension tests. The machine works with Dantec Q-400 Istra multi-camera 3D correlation system. System of three cameras mounted on a beam line is used for accurate measurement of the spatial deformations. Presented results of the research include strain fields measured for the entire tension cycle at the frequency 40 Hz.