NDT tests - VT+PT methods
VT: ČSN EN ISO 17637: Non-destructive testing of welds - Visual inspection
Visual inspection is the basic and oldest non-destructive method of detecting surface defects on products, welds, components and assessing the condition of individual parts of various equipment. Visual inspection should always precede another non-destructive method, as it may reveal defects that may prevent the correct execution or evaluation of the results of another non-destructive method. For a quality visual inspection, it is necessary to know the construction of the inspected equipment, the technology used in the production of the inspected product, the types and causes of the defects. The quality of the visual inspection is based on the many years of experience of the worker performing this inspection.
Visual tests are performed by a VT inspector, qualified according to EN ISO 9712, level 2:
* we perform visual tests both in our own premises and directly at customers.
* evaluation of visual inspection according to ISO 5817, 10042; the result is recorded in the Protocol.
PT: ČSN EN ISO 3452-1 Non-destructive testing - Capillary test
The capillary/penetration method of non-destructive testing can only identify defects in the surface layers of the material (e.g. pores, inflammations, cold joints, cracks - everything on the weld surface) and can also be used to test the tightness of welds. This method is very sensitive to the preparation of the tested surface – the surface must be thoroughly cleaned of mechanical impurities, scale, rust, paint and degreased before the test.
BASIC STANDARDS USED
ČSN EN ISO 23277 NDT of welds - Capillary test - degrees of acceptabilityČSN EN ISO 12706 Terminology - TermsČSN EN ISO 3452-3 NDT testing - Capillary test - Part 2: Check gaugesČSN EN ISO 3452-4 NDT testing - Capillary test - Part 3: equipmentČSN EN 1371-1 Foundry - Inspection by capillary method - Part 1: Castings
Capillary tests are performed by a PT inspector, qualified according to EN ISO 9712, level 2:
* We perform capillary/penetration tests on our own premises and directly at customers.* We evaluate the penetration test according to EN ISO 23277; the result is recorded in the Protocol.
