Which radiography method yields approximately 0.85 joint efficiency?

Which radiography method yields approximately 0.85 joint efficiency?

• A. Full radiography
• B. Spot radiography
• C. Ultrasonic testing
• D. Dye penetrant testing

Answer: (B)

In ASME codes, joint efficiency represents how much of a weld is considered inspected based on the nondestructive examination method used. Full radiography examines the entire weld length, so the joint efficiency is 1.0. Spot radiography looks at selected portions of the weld, leaving portions unexamined, which reduces the confidence in detecting flaws across the whole weld; this approach is associated with about 0.85 joint efficiency. Ultrasonic testing and dye penetrant testing are also nondestructive methods but are not radiography, and they have different coverage implications in code calculations. Therefore, the radiography method that yields roughly 0.85 joint efficiency is spot radiography.

In ASME codes, joint efficiency represents how much of a weld is considered inspected based on the nondestructive examination method used. Full radiography examines the entire weld length, so the joint efficiency is 1.0. Spot radiography looks at selected portions of the weld, leaving portions unexamined, which reduces the confidence in detecting flaws across the whole weld; this approach is associated with about 0.85 joint efficiency. Ultrasonic testing and dye penetrant testing are also nondestructive methods but are not radiography, and they have different coverage implications in code calculations. Therefore, the radiography method that yields roughly 0.85 joint efficiency is spot radiography.