What type of NDT is typically used for weld inspection?

Weld inspection is critical in ensuring the integrity and safety of welded joints, and both ultrasonic testing and radiographic testing are frequently employed for this purpose. Ultrasonic testing utilizes high-frequency sound waves to detect internal flaws within the weld, such as cracks or inclusions, and can provide detailed information about the dimensions and orientation of any detected discontinuities. It is particularly effective for thicker materials and can assess the weld integrity without requiring access to both sides of the joint.

Radiographic testing, on the other hand, employs X-rays or gamma rays to produce images of the weld area. This technique allows for the visualization of internal features and defects, including porosity, slag inclusions, and lack of fusion. It is particularly useful for identifying issues that may not be apparent on the surface. Both techniques are capable of providing a high level of confidence in the integrity of the weld, thus making them the preferred choices for weld inspection in various industries.

While each of the other options has its own merits in non-destructive testing, they are more limited in their application to weld inspection. For instance, magnetic particle testing is suitable for detecting surface and near-surface discontinuities in ferromagnetic materials but is not effective for deep, internal flaws common in welds.