In radiographic test, type of defect not detectable by X-Ray is
- A. Delamination in cladded sheet
- B. Porosity in castings
- C. Tungsten inclusion in TIG weld
- D. Under cut in metal arc welding
Answer: D. Under cut in metal arc welding
Explanation: Radiography is best for volumetric defects. Surface defects like undercut are better detected visually or with penetrants. Also laminar defects perpendicular to beam are hard to detect.