Estudo de uniões soldadas de chapas de aço SAE 1008 por processo GMAW

Abstract

Low carbon steel sheets are widely used in the road implements market since the replacement to new projects and applications. The most common joining process for them is the GMAW process because it is easy to automate and relatively affordable. In order to understand the behavior of the material in the face of this process Welding parts were welded on 8 mm thick plates using two different welding parameters. With these parts mechanical and metallographic tests were carried out to analyze the mechanical properties and the structural transformations for each case. The results showed that the amount of energy used in welding should be sufficient for the material to acquire properties and strength so as not to fail because of some discontinuities. A computer simulation of the stresses existing in the weld beads regions was also carried out to verify whether the stresses exerted on the component are supported by the filler metal and the raw material. The stress values found in the simulation demonstrate that the sizing of the weld beads is within what the application requires. These results help in choosing the welding parameters and dimensioning the weld beads joining the quality of the process at the best cost. [resumo fornecido pelo autor]