Which statement best describes a butt joint?

• A. A joint formed by joining two pieces along their edges in a straight line
• B. A joint used for corner connections
• C. A joint that uses a fillet weld at the intersection
• D. A joint that uses a lap arrangement

Answer: (A)

A butt joint is about joining two pieces by placing their edges together in the same plane so they align along a straight seam. The weld runs along that seam, creating a flat, continuous line from one end to the other. This setup is distinct from corner joints, where pieces meet at an angle to form a corner; lap joints, where one piece overlaps the other; or joints that rely on a fillet weld at an intersection (such as T or corner arrangements), which are not flush edge-to-edge along a single straight seam. So the description of two pieces joined along their edges in a straight line best captures a butt joint.