Visual Testing

A nondestructive examination method used to:

  • evaluate an item by observation.
  • Used to determine the surface condition of an article,
  • alignment of mating surfaces, compliance with physical
  • requirements (dimensions, settings), etc.
  • Usually the first method employed for locating suspected ddefects


Why Visual Examination?

  • Can be used to inspect for surface
  • breaking discontinuities
  • Cracks
  • Holes
  • Corrosion
  • Does not require special equipment other than good eyesight(optical and mechanical aids optional to improve inspection quality)
  • Low cost


Visual Inspection Optical Aids

  • Used when direct visual examination is not possible
  • Microscopes
  • Borescopes
  • Fiberscopes
  • Video Cameras
  • Visual Inspection


Visual Inspection Mechanical Aids:

  • Micrometers
  • Calipers
  • Depth gauges
  • Thread pitch gauges
  • Feeler gauges
  • Weld gauges
  • Mirror