Which radiography method yields 0.90 joint efficiency?

Which radiography method yields 0.90 joint efficiency?

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

Answer: (A)

Understanding how inspection methods impact design factors is key here. In ASME design, the joint efficiency is the factor applied to the weld’s strength to reflect how confidently defects have been ruled out, and it depends on the nondestructive examination (NDE) method and its coverage. Full radiography inspects the entire length of the weld, providing the highest level of defect detection among radiographic methods. Because the weld is checked along its full extent, the code associates this level of assurance with a joint efficiency of 0.90. The other options either involve partial coverage or are different NDE methods with their own efficiencies, not the 0.90 value tied to full radiography. Spot radiography covers only parts of the weld and would yield a lower efficiency; ultrasonic testing and dye penetrant testing are not radiography and carry different efficiency considerations in the code.

Understanding how inspection methods impact design factors is key here. In ASME design, the joint efficiency is the factor applied to the weld’s strength to reflect how confidently defects have been ruled out, and it depends on the nondestructive examination (NDE) method and its coverage.

Full radiography inspects the entire length of the weld, providing the highest level of defect detection among radiographic methods. Because the weld is checked along its full extent, the code associates this level of assurance with a joint efficiency of 0.90. The other options either involve partial coverage or are different NDE methods with their own efficiencies, not the 0.90 value tied to full radiography. Spot radiography covers only parts of the weld and would yield a lower efficiency; ultrasonic testing and dye penetrant testing are not radiography and carry different efficiency considerations in the code.