<p>The application of Al–Li alloy extrusion profiles in the aerospace sector is of considerable importance, as it can notably reduce the weight of aerospace equipment and enhance the structural strength of these systems. This study investigated the effects of welding temperature and time on the dynamic recrystallization (DRX) and solid-state welding behaviors of 1420 Al–Li alloy. Additionally, the microstructures within the welding zones and adjacent to the welding interfaces were characterized and analyzed. The results demonstrated that the extent of DRX and the degree of grain refinement increased as welding temperature and time increased. At low welding temperatures and brief times, the predominant recrystallization mode was continuous dynamic recrystallization (CDRX). CDRX grains attain interface closure by growing and engulfing the micro-voids present between the two matrixes. As the temperature and time increased, discontinuous dynamic recrystallization (DDRX) emerged as the dominant mechanism, during which the grain boundaries near the weld initially bulged and then subsequently migrated, gradually resulting in the disappearance of the weld. In addition, as the welding temperature increased, the texture components transitioned from shear components to recrystallized ones, the texture intensity subsequently diminished, and the variety of texture components expanded.</p>