NDT Technique · VT

Visual
Testing

The most widely used inspection method — a critical foundation of any NDT program.

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Overview

Visual Testing (VT) is probably the most widely used of all inspection methods. Despite the many factors which are beyond the scope of visual examination, it must be regarded as one of the most important methods for determining weld quality and general component integrity.

Direct and Remote Visual Inspection

VT encompasses both direct visual inspection — where the inspector views the component directly — and remote visual inspection using tools such as mirrors, borescopes, video probes, and cameras to access confined or restricted areas.

What Visual Testing Can Identify

  • Surface cracks, undercuts, and overlap in welds
  • Dimensional non-conformances and misalignment
  • Surface corrosion and pitting
  • Mechanical damage, dents, and deformation
  • Incorrect surface finish or preparation
  • Missing or damaged components
  • Weld profile, bead geometry, and surface porosity

Applications

  • Pre-weld and post-weld visual inspection
  • In-process quality control during fabrication
  • In-service inspection of structures, vessels, and pipelines
  • Incoming material and equipment checks
  • Confined space and remote area inspection
  • Structural integrity assessments

Standards Compliance

All visual inspections are conducted by trained and certified personnel in accordance with applicable international codes including AWS, ASME, ISO 17637, and relevant South African standards. Detailed inspection reports with photographic records are provided.

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