This paper presents the construction and the validation of a volumic detailed model of different Laser-welded samples (shear-tension, lap-shear and coach-peel) using the finite element method. This study is carried out for mild steel with two different sheet thicknesses. The goal of this detailed model is to provide input data for the validation of a simplified model, which will be later on implemented in the complete car model. Using the detailed simulation, local mechanical data can be obtain with a high discretization level which can lead to a better understanding of damage propagation. Moreover, the effects and the consequences of process imperfections on the Laser-weld's stress carrying capacity can be evaluated. By studying a cross section of a Laser-welded specimen, three different sub-areas (Laser- weld, heat affected zone and basis material) have been identified and characterized using the Vickers hardness test. Moreover, the weld's geometry has been carefully analyzed to construct a fine and precise volumic FE-model based on volumic elements with a length of 0.20 mm in some critical areas. To reflect the different mechanical properties of each zone, a simple method based on the extrapolation of the tensile strength from the Vickers hardness has been used. This allows us to obtain the different stress/strain curves for the three sub-zones. Parallel to that a more precise method based on mini-specimens is under development in order to obtain experimentally the complete yield curve for each material sub-zone. To compute the accumulation of damage and the rupture inside the specimen, the Gurson material model implemented in the explicit time integration method of LS-DYNA3D have been used. The global accuracy of the detailed model is checked by comparing the simulated and experimental force/displacement curves and the visual rupture mode of the specimens for a quasi-static load case of 10 mm/min. This study shows that numerical detailed models of shear-tension, lap-shear and coach-peel specimens are in good accordance with the experiments for a given mild steel under a quasistatic load case. In fact, the computed force/displacement curve is in a pretty good accordance with the experimental one for the two symmetrical combinations: 1.5 mm/1.5 mm and 1.0 mm/1.0mm. Moreover, based on these two symmetrical cases, an unsymmetrical case (1.5 mm/1.0 mm) has been studied and gives also satisfying results