 This study investigated the effects of welding on a bridge constructed from steel S355. Welding was performed at low ambient temperatures, and the resulting deformations were measured using optical system tritop. These data were then used as input for finite element analysis, FEA software sysweld, which predicted the temperature cycles, angular deformations, and residual stresses. The results showed that the predicted values of angular and linear d- This article was authored by Radoslav Konar, Marek Patek, and Nilos Mykian.