Why is it important that all industrial non-destructive testing is preceded by a visual inspection (VT)?

Visual inspection is important in non-destructive testing. The method is fast and economical; it helps avoid unnecessary costs and use resources more efficiently.

Visual inspection (VT) is of paramount importance before any industrial non-destructive testing of materials. It is the first step in a reliable and efficient inspection process and has many benefits in terms of preventing unnecessary inspections and efficient use of resources.

During a visual inspection, professionals look for defects that are visible to the eye in the material or surface being inspected. This allows for the identification of obvious defects such as , deformations, welds in the case of e.g. edge efflorescence, excessive weld swelling. Visual inspection can also be used to detect defects whose dimensions or nature make further non-destructive testing unreasonable.

The size of the defects that can be seen by eye can vary considerably, depending on the material being tested. For example, cracks can range in length from a few hundredths of a millimetre to several centimetres. The detectability of a flaw depends on the surface quality of the material under test, the environmental conditions and the inspection tools used.

The advantage of visual inspection is that it is a quick and easy method to identify defects. It requires no special equipment and provides immediate results. It also allows the material tester to plan in more detail and prepare for further testing if necessary.

In non-destructive material testing, visual inspection is of paramount importance to avoid unnecessary inspections and to ensure efficient use of resources. This method allows professionals to immediately identify defects that can be detected visually and to decide whether further inspections are necessary. This saves time, cost and resources and allows them to perform non-destructive material testing more efficiently.