What is considered a common inspection method for verifying the internal quality of welds?

• A. Visual inspection
• B. Magnetic particle testing
• C. Radiographic testing
• D. Eddy current testing

Answer: (C)

Radiographic testing is a widely used inspection method for verifying the internal quality of welds. This non-destructive testing technique involves passing X-rays or gamma rays through the welded joint to create an image on a film or digital detector. The resulting radiograph reveals internal defects such as voids, inclusions, and cracks, which may not be visible on the surface. Because of its ability to provide a comprehensive view of the internal structure, radiographic testing is particularly valuable in applications where maintaining the integrity of welds is critical, such as in pressure vessels, pipelines, and structural components.

While visual inspection is a fundamental method, it is limited to surface flaws and cannot assess internal issues. Magnetic particle testing and eddy current testing are effective for detecting surface and near-surface defects but do not offer the same level of insight into the internal quality of a weld as radiographic testing does. This makes radiographic testing the preferred choice when a thorough examination of internal weld quality is required.