NDT Level III Personnel Qualification Certification for VT - Visual Testing Outline

About Visual Testing (VT)

Visual testing is the most commonly used test method in industry. Because most test methods require that the operator look at the surface of the part being inspected, visual inspection is inherent in most of the other test methods. As the name implies, VT involves the visual observation of the surface of a test object to evaluate the presence of surface discontinuities. VT inspections may be by Direct Viewing, using line-of sight vision, or may be enhanced with the use of optical instruments such as magnifying glasses, mirrors, boroscopes, charge-coupled devices (CCDs) and computer-assisted viewing systems (Remote Viewing).  Corrosion, misalignment of parts, physical damage and cracks are just some of the discontinuities that may be detected by visual examinations.

Topical Outline

This examination is 2 hours in length, having 90 questions of equal value.

  • Fundamentals
    • Vision and light
    • Ambient conditions
    • Test object characteristics
    • Equipment Accessories
      • Magnifiers/microscopes
      • Mirrors
      • Dimensional
      • Borescopes
      • Video systems
      • Machine vision
      • Replication
      • Temperature indicating devices and materials
      • Chemical aids
      • Surface comparators
      • Lasers
      • Applications and Requirements
        • Raw materials
        • Primary process materials
        • Joining processes
        • Fabricated components
        • In-service materials
        • Coatings
        • Other applications
        • Requirements
        • Variables Affecting Results of interpretation/ Evaluations
          • Equipment including type and intensity of light
          • Material including the variations of surface finish
          • Discontinuity
          • Determination of dimensions (ie: depth, width, length, etc.)
          • Sampling/scanning
          • Process for reporting visual discontinuities
          • Personnel (human factors)
          • Documentation
          • Safety

          References

          The number in parentheses following each reference is the ASNT catalog number.