AID Yousra, RihemBERAKNE, KhadidjaDr ELAHMAR Kadi, Adel2025-07-142025-07-142025http://dspace.univ-temouchent.edu.dz/handle/123456789/6657Welding is a very well-known assembly process in the mechanical industry, for this reason various studies and research are interested in this area, the variation of the processes has allowed researchers to deepen their research into the rupture and damage of welded structures. To this end, the aim of our thesisis the study of damage to welded joints of A48-AP steel. The objective of this manuscript is to highlight the influence of the heterogeneity of the microstructure of the welded joints on the mechanical behavior of the structure, as well as a numerical simulation by finite elements is applied on notched axisymmetric specimens to model the effect of heterogeneity on the damage of the welded structure.frThesis