What is the primary purpose of radiographic testing in welding?

• A. To measure the temperature of the weld
• B. To inspect internal flaws in welds using X-rays or gamma rays
• C. To assess the visual appearance of welds
• D. To determine the hardness of weld joints

Answer: (B)

The primary purpose of radiographic testing in welding is to inspect internal flaws in welds using X-rays or gamma rays. This non-destructive testing technique provides a detailed view of the internal structure of welds without damaging the materials being tested. By passing X-rays or gamma rays through the weld and capturing the resulting image on film or a digital detector, inspectors can identify various internal defects, such as cracks, voids, inclusions, or other discontinuities that might compromise the integrity of the weld.

This method is particularly valuable because many flaws are not visible from the surface, and radiographic testing allows for a thorough assessment of the weld quality. The ability to visualize internal flaws is crucial in ensuring that the welded joints meet safety and performance standards, especially in critical applications such as structural, aerospace, and pressure vessel fabrication. This makes radiographic testing an essential part of the quality control process in welding.