Abstract
AbstractMechanical modeling of the Gas Metal Arc Welding (GMAW) joint and the Gas Tungsten Arc Welding (GTAW) joint were characterized utilizing tensile testing, microhardness testing and finite element (FEM) analysis. Experiments have been done on joints welded in two different directions; longitudinal welds (LW) and transversal welds (TW). The obtained results illustrate the effects of processes and directions of welding on the strength, hardness and brittleness of welded materials. This is suitable for the two welding processes GMAW and GTAW. The results give different characteristics between longitudinal and transverse welds. This is because the fusion zone is wider for the longitudinal weld than in the transverse weld. Good agreement is found between the material properties obtained from analysis by ABAQUS and experimental results. Furthermore, we develop a procedure for the identification of the behavior laws of GMA and GTA welding joints. We use an inverse optimization method based on tensile tests. The hardening behavior of the investigated steel welded joints is determined by Hollomon’s hardening law. The hardening model is completely defined once the coefficients (strength coefficient and strain hardening exponent) of the Hollomon model are determined. The validation of the proposed procedure is ensured by a comparison between numerical and experimental true stress/strain curves.KeywordsSimulationGMAW weldGTAW weldMechanical propertiesModeling
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