Which non-destructive examination method uses radiation to view the interior of welds?

Which non-destructive examination method uses radiation to view the interior of welds?

• A. Visual inspection (VT)
• B. Radiographic (RT)
• C. Magnetic Particle (MT)
• D. Liquid Penetrant (PT)

Answer: (B)

Radiography uses X-rays or gamma rays to pass through a weld and form an image of its interior. By capturing how the radiation is absorbed along the weld, you can see internal features such as porosity, cracks, or lack of fusion that aren’t visible on the surface. The resulting radiograph is read for density differences that indicate flaws, and it may be recorded on film or a digital detector. Because radiation is involved, proper shielding, safety practices, and access controls are essential. Other methods shown inspect surface conditions or magnetic responses and won’t reveal internal weld details the way radiography does.

Radiography uses X-rays or gamma rays to pass through a weld and form an image of its interior. By capturing how the radiation is absorbed along the weld, you can see internal features such as porosity, cracks, or lack of fusion that aren’t visible on the surface. The resulting radiograph is read for density differences that indicate flaws, and it may be recorded on film or a digital detector. Because radiation is involved, proper shielding, safety practices, and access controls are essential. Other methods shown inspect surface conditions or magnetic responses and won’t reveal internal weld details the way radiography does.