Non-destructive testing of products
Non-destructive testing of products
Why should you test products with us?
The scope and variety of the testing of raw materials and other materials in particular branches and fields, for instance structural and building materials, weldments, testing of games and toys or testing of other semi-finished products or finished products. A number of these tests require special equipment and experience such as running and evaluating the tests. LL-C (Certification) Czech Republic s.r.o. is capable of testing and evaluating a wide range of such products, within the provision of testing services, which are tested in accordance with specified product testing standards by testing laboratories having high-quality equipment and qualified staff.
Main methods of non-destructive testing
is classified as a method for the purpose of exposing surface defects of materials (especially with welds, products, castings and forged pieces). Visual inspection is considered the cheapest identification of critical spots – surface non-integrities (cracks, corrosion, porosity, exposed shrink holes and other defects). The visual method mostly precedes another non-destructive method (PT, UT, MT, RT).
is perceived as a method of exposing surface defects of material (especially with welds, products, castings and forged pieces). Principles of the method are clear from its title - capillary action. On the basis of capillarity and wettability of penetrant (indicator of defects on the material surface) their colour difference from the basic material is used as the main identifier of the surface defect. The capillary method precedes other volumetric NDT methods (UT, RT).
Eddy current method
is a surface method for the purposes of testing electrically conductive materials. The eddy current method is most often used for exposing surface defects, it is however possible to identify also defects with the maximum depth of 10 – 25 mm on the outside of the material (depth depends on the kind of material).
is a volumetric non-destructive method used for identification of defects on the outside of the material, and used for identification of defects on the outside of the material, this methods allows to expose defects on the outside of metal and non-metal materials. Main types of checked products are especially metallurgical semi-finished products, castings, forged pieces, workpieces or weldments. The ultrasound method is focused not only on the identification of volumetric inner defects of material, surface defects of the type of cracks or duplications and also on the detection of the thickness of material (plates, tubes).
Types of tests
inspection of material, parts, weldments consisting of several non-destructive methods (VT, PT, UT), which are suitably chosen to carry out an optimum analysis of the tested article. The non-destructive methods are performed by qualified staff within the 2nd stage on the basis of existing standards (for instance VT - EN 473).
Measuring the material thickness
measuring the thickness of walls of pipes, pressure vessels, steel structures by means of the ultrasound method (material thickness steel/cast iron 0.75mm - 300 mm).
Measuring the surface finish thickness
using the magnetic method as well as the eddy current method for the purpose of determining the thickness of coating layers on various kinds of base (scope of coating thickness 0 - 1250 µm).
Measuring the hardness
in a number of cases it is not possible to use standard hardness testers, therefore it is possible to perform the harness tests by means of a suitable portable hardness tester along with the use of the ultrasound or dynamic method (types of tests by HV, HB, HRB, HRC, HL).
Applying the results in industry
Identification of defects
the main purpose of performing non-destructive testing is identification of whether a product or equipment does not exhibit a defect preventing its use in relation to normative standards. Within the defect identification it is necessary to specify its character and subsequently establish its location in connection with its subsequent repair.
Safety of operation
non-destructive testing is of enormous importance in connection with the provision of safety of operation of complex manufacturing plats (nuclear power plants, power distribution, oil rigs, petrochemical plants and their equipment and their equipment). Through non-destructive testing it is possible to monitor equipment without dismantling it. By means of these methods it is possible to identify and predict any subsequent repairs, stoppages or replacements of particular parts and thus it is possible to avoid any possible ecological disasters.