What are the different kind of seams and edge in sheet metalwork?

In sheet metalwork, common types of seams include lap seams, butt seams, and edge seams. Lap seams involve overlapping two pieces of metal, while butt seams join edges directly without overlap. Edge types can include folded edges, which provide strength and safety, and rolled edges, which create a smooth finish. Each seam and edge type serves specific structural and aesthetic purposes in metal fabrication.