The finite element method was used to model the behavior of welded connections in trusses. All truss members and connections details were idealized to include their interaction behavior and to know how the truss would behave in the context of welded connections. Solid isoparametric brick elements were used. Welded connections provide rotational stiffness. This is due to welds elastic straining action that is limited by the weld ability to resist the produced stresses. The results obtained were used to discuss the pinned connection assumption, commonly used for the analysis of trusses considering welds design and factor of safety consistency.