This video explains the key differences between weld beads and fillet beads in SOLIDWORKS. Weld beads provide a lightweight, graphical representation of welds for documentation and callouts, without creating solid bodies—ideal for performance and drawings. Fillet beads, on the other hand, create solid geometry, enabling clearance checks, material properties, and FEA analysis, as well as realistic rendering. Weld beads can be added at the assembly level, while fillet beads are limited to multi-body parts. The choice depends on your goal: use weld beads for documentation and cost tracking, and fillet beads for physical accuracy and simulation.