The shape and dimensions of a joint in cross section prior to welding.

The distance the weld metal extends from the weld face into a joint, exclusive of weld reinforcement.

That portion of a joint to be welded where the members approach closes to each other. In cross section, the joint root may be either a point, a line, or an area.

A weld joint classification based on five basic joint configurations such as a butt joint, corner joint, edge joint, lap joint, and T-joint.