The subject of the work is to present the possibility of using a non-contact optical system for measuring strains. Dantec's multi-unit Q-400 3D image correlation system was used. The aim of the study was to determine the distribution of displacements and strains on the surface of hybrid welded samples during the tensile test. The measurement was mainly used to estimate the mechanical properties of the welded joint, taking into account the change in the properties of the various joint zones. Measurement was carried out by tracing the displacement of the prepared surface of the tensile sample. In the paper, the results of the studies show the displacement and deformation fields for different tensile steps of flat samples to compare the effect of the process parameters selection on the mechanical properties of welded joints. Results were compared with the results of tensile test of the base material to determine the impact of the welding process change the mechanical properties of the investigated steel.Keywords: Strains, displacements, 3D image correlation system
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