What category of joint is used to identify a circ seam when joining two shells together?

What category of joint is used to identify a circ seam when joining two shells together?

• A. Category B
• B. Category A
• C. Category C
• D. Category D

Answer: (A)

When two shells are joined around the outside to form a circle, the seam around the circumference is a butt joint. The two shell edges are brought together edge-to-edge and welded along the circle, creating a continuous ring around the cylinder. This configuration—edges meeting flush in a single plane and fused with weld metal—fits the category of a butt joint for shell-to-shell circumferential welding. It’s not an overlapping (lap) or corner/tee type, which would involve different edge arrangements or attachment to a third piece. So, the circ seam is best identified as the edge-to-edge butt joint around the circumference.

When two shells are joined around the outside to form a circle, the seam around the circumference is a butt joint. The two shell edges are brought together edge-to-edge and welded along the circle, creating a continuous ring around the cylinder. This configuration—edges meeting flush in a single plane and fused with weld metal—fits the category of a butt joint for shell-to-shell circumferential welding. It’s not an overlapping (lap) or corner/tee type, which would involve different edge arrangements or attachment to a third piece. So, the circ seam is best identified as the edge-to-edge butt joint around the circumference.