For a closed-root weld, what is the main focus of inspection?

For a closed-root weld, what is the main focus of inspection?

• A. Root penetration should be complete at the root with minimal underfill.
• B. Root penetration is not inspected for closed-root welds.
• C. Only surface finish is inspected.
• D. Root quality is not inspected for closed-root welds.

Answer: (A)

For a closed-root weld, the essential thing to verify is the root itself: it should be fully penetrated and not underfilled. Closed-root means the weld has fused right to the root so there isn’t an open gap, and that root integrity is crucial for the joint’s strength. If the penetration at the root is incomplete or there is significant underfill, the weld may not transmit loads properly and could be susceptible to cracks or failure under service. So inspectors focus on confirming complete root penetration at the root and keeping any underfill to a minimum. Surface finish and other aspects matter, but they do not replace the need to prove the root is properly fused. Techniques like radiography or ultrasonic testing are used to verify root penetration, while visual checks may note any excess material or lack of fusion at the root.

For a closed-root weld, the essential thing to verify is the root itself: it should be fully penetrated and not underfilled. Closed-root means the weld has fused right to the root so there isn’t an open gap, and that root integrity is crucial for the joint’s strength. If the penetration at the root is incomplete or there is significant underfill, the weld may not transmit loads properly and could be susceptible to cracks or failure under service.

So inspectors focus on confirming complete root penetration at the root and keeping any underfill to a minimum. Surface finish and other aspects matter, but they do not replace the need to prove the root is properly fused. Techniques like radiography or ultrasonic testing are used to verify root penetration, while visual checks may note any excess material or lack of fusion at the root.