What is a key reason for performing non-destructive testing on welded joints?

• A. To determine material hardness only
• B. To remove material for testing
• C. To detect defects without damaging the component
• D. To accelerate production time

Answer: (C)

Non-destructive testing is used to detect defects in welded joints without damaging the component. This lets inspectors verify weld integrity while the part can remain in service or be returned to service after inspection. NDT checks for cracks, porosity, inclusions, and lack of fusion without removing material, so the weld can be evaluated without harming the part. That focus on finding flaws without causing damage is why this is the best answer. The other ideas aren’t the main purpose: hardness testing assesses material properties and may involve contacting or altering the surface, removing material is destructive testing, and speeding production time isn’t the goal of NDT.