Describe the typical TIG bead profile for a root pass on a square-edge butt joint and how to judge sound weld quality.

• A. A narrow, uniform root bead with proper penetration and tie-in; no excessive reinforcement, porosity, or undercut; consistent bead height along the joint.
• B. A wide root bead with heavy reinforcement is ideal.
• C. Porosity at the root is acceptable if it is small.
• D. Undercut at the root is desirable.

Answer: (A)