The American Welding Society defines a joint as “the manner in which materials fit together.” there are five basic types of weld joints: • Butt joint. • T-joint. • Lap joint. • Corner joint. • Edge joint. 1. Butt joint: Butt joints are end to end joint, in which the parts lie in the same plane and are joined at the ends. 2. T-joint: In a T-joint (also called as….