This report presents the work carried out during an internship at CEA, within the framework of the PEPR Suprafusion project, which aims to develop technologies for nuclear fusion applications. The study focuses on the mechanical and electrical characterization of composite conductors based on High-Temperature Superconducting (HTS) tapes developed at CEA. The first part of the work involved analyzing the parameters and methodologies of the assembly process. Critical aspects were identified and addressed to improve both efficiency and reproducibility. In addition, metallographic analyses were performed on conductor cross-sections to better evaluate the geometry of the HTS tape and the quality of the brazing process.