TEMMOUN, Sid AhmedTOUMI, Ibrahim El KhalilBENSAAD, Bourassia2025-09-142025-09-142025http://dspace.univ-temouchent.edu.dz/handle/123456789/6844This Master's thesis in Materials Process Engineering presents an in-depth study of materials science, focusing on their definition, classification, and fundamental properties. It distinguishes five major families of materials: metals, polymers, ceramics, composites, and semiconductors, detailing their mechanical, thermal, electrical, optical, and chemical characteristics. The analysis of micro and macrostructure, as well as phase diagrams, helps to understand the influence of internal organization on their performance. The thesis also highlights the importance of manufacturing processes, particularly welding, and their impact on the mechanical properties of iv materials. A welding simulation is carried out to evaluate its effects on the strength and deformation of welded materials. This comprehensive approach aims to optimize the selection and implementation of materials to meet the increasing demands of modern industry, thus ensuring innovation and quality in various technological sectors.frThesis