Which of the following NDE techniques has limited use in weld inspection?

The selection of eddy current examination as having limited use in weld inspection is primarily related to the specific capabilities and limitations of this technique in detecting discontinuities within welded materials. Eddy current testing is effective for detecting surface and near-surface discontinuities in conductive materials; however, it is less effective for volumetric defects or those deep beneath the surface.

In the context of weld inspection, eddy current techniques are often overshadowed by other more comprehensive techniques, like radiographic testing, which can uncover internal discontinuities such as cracks and voids throughout the weld area. Additionally, eddy current testing typically requires careful calibration and is dependent on the shape and size of the part being tested, making it less versatile compared to other non-destructive examination methods.

Visual testing, on the other hand, is universally applicable and straightforward for initial assessments of weld quality. Radiographic testing and magnetic particle testing serve well in identifying various types of defects in welds, whereas eddy current is limited in scope, particularly when it comes to comprehensive weld inspection. This combination of factors helps clarify why eddy current examination is regarded as having limited use specifically in the context of weld inspection.