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Visual testing (VT)​

The visual inspection (also VT test) is the optical control of a product or product part to identify flows such as mechanical damage, dirt deposits, assembly errors, burr formations or surface irregularities. The visual inspection is the first and most important surface testing method, which is usually used at the end or after the completion of the parts used for the production but can also be carried out on parts already in use.
In some cases, the naked eye is adequate for this testing procedure, but in others, technical aids must be utilized. In the case of minor flows, a magnifying glass or a microscope can be sufficient. In the case of difficult geometries, the use of mirrors or endoscopes may be required.
In addition to the visual accessibility of the test area, an appropriate light source is required for this process.
If it is possible to investigate the imperfections any further, a depth assessment of the flaw is also possible.

The following errors can be visually assessed:
Damage related to mechanical, heat, chemical, welds (binding faults, start-up scars, welding splashes, etc.) impact.

  • Surface irregularity
  • Corrosions
  • Geometry
  • Warping
  • Surface film
  • Deposits
  • Coatings
  • Passages
  • Scaly surface area
  • Welding marks
  • Veins and lose scabs

Normative Verweisungen:

DIN EN ISO 17637 2011-05 Zerstörungsfreie Prüfung von Schweißverbindungen – Sichtprüfung von Schmelzschweißverbindungen

DIN EN ISO 17637 2015-12 Zerstörungsfreie Prüfung von Schweißverbindungen – Sichtprüfung von Schmelzschweißverbindungen

DIN EN 13018 2001-07 Zerstörungsfreie Prüfung – Sichtprüfung – Allgemeine Grundlagen (zurückgezogene Norm)

DIN EN 13018 2016-06 Zerstörungsfreie Prüfung – Sichtprüfung – Allgemeine Grundlagen

ASME-Code 2010 + 2011a Addenda / Section V / Article 9 Visual Examination

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