VT visual method

The visual inspection is the basic and oldest non-destructive method for detection of surface defects on products, welds, components, and for the assessment of the condition of individual parts of various facilities. The visual inspection should always precede other non-destructive method, because it can reveal defects that can prevent correct performance or assessment of results of other non-destructive method. For the purpose of high quality performance of visual inspection it is necessary to know the construction of the inspected facility, technology of the production of the inspected product, types of defects and their causes of occurrence. The quality of visual inspection is based on long-time experiences of the worker who performs this inspection.

We can divide the visual inspection into direct and indirect inspection.

 

Direct visual inspection

 

This inspection can be performed only on places, where the operator can physically get into. The eyesight of the operator is used during this method, respectively simple aids can be used (magnifying glass, gauges, camera etc.).

 

Indirect visual inspection

 

Places that are inaccessible for the eye of the operator are inspected with endoscopes (fixed or flexible).