It sounds like you are looking for the solution manual (solucionario) for Diseño de Elementos de Máquinas by Robert L. Mott (likely the Spanish translation of Machine Elements in Mechanical Design).
Step-by-Step Methodology: Unlike many manuals that provide only final answers, Mott’s solutions emphasize the design process. They typically break down complex problems into manageable steps: identifying input data, selecting materials, performing stress analysis, and final verification. solucionario diseno de elementos de maquinas mott
Here's a basic example of how to approach solving a problem in machine design, inspired by Mott's book: It sounds like you are looking for the
Uniones Roscadas y Soldadura: Análisis de juntas bajo carga estática y dinámica. ¿Cómo utilizar el solucionario correctamente? performing stress analysis