Which description best defines a sound TIG root pass on a square-edge butt joint?

Which description best defines a sound TIG root pass on a square-edge butt joint?

• A. A wide root bead with high porosity is ideal.
• B. A narrow, uniform root bead with proper penetration and tie-in, no excessive reinforcement, porosity, or undercut; consistent bead height along joint.
• C. Inconsistent bead height is acceptable if the fill passes.
• D. Porosity at root is acceptable if not visible.

Answer: (B)