<div class="htmlview paragraph">In the Automotive Field, the current research is aimed at decreasing product costs and timing while increasing reliability. Therefore, carmakers are asking their partners to meet these goals. In this way, development stages use more and more numerical tools to test different solutions quickly. However, in order to be representative, these numerical studies must be reliable and take into account all manufacturing operations done on the part.</div> <div class="htmlview paragraph">In the chassis system, we use a lot of assembly process in order to build components. One of these methods is the welding technic. To simulate a welded part, we have to know and modelize some production parameters.</div> <div class="htmlview paragraph">In this paper, the definition of the influential factors on the welding beads' reliability and an integration method in numerical calculations regarding the effects of these parameters are introduced.</div>