Which NDT method is best?
There is no single best method — the right choice depends on the material, suspected defect, orientation, surface condition, access, required sensitivity and acceptance criteria. UT may suit internal flaws or thickness; ECT and MPI suit different surface or near-surface applications; PT reveals surface-breaking indications on suitable clean, non-porous materials.
Answer
There is no single best method — the right choice depends on the material, suspected defect, orientation, surface condition, access, required sensitivity and acceptance criteria. UT may suit internal flaws or thickness; ECT and MPI suit different surface or near-surface applications; PT reveals surface-breaking indications on suitable clean, non-porous materials.
Methods may be combined, and every result has a stated scope and limitations. Selection should be agreed with the applicable procedure or responsible engineer where the result affects acceptance or continued operation.