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The method is the same as the one used in the medical field.
A beam of radioactive waves is passed through the object to be examined and is absorbed differently depending on the thickness and density of the matter it passes through.
Behind the object, a photographic film is placed which, after development, will take on different shades of grey in proportion to the dose of radiation received. In this way, any defects such as cavities, cracks or differences in material density are highlighted.
TESTABLE PRODUCTS
Testable products can be: welds, rolled products, forgings, drawn products, fusions, castings, machined parts.
ADVANTAGES
The advantages consist of the high degree of reliability and the possibility of highlighting internal defects as well. Moreover, radiographic testing stands out from other methods for its documentability over time.
DISADVANTAGES
The limits are the impossibility of use on materials opaque to radiation or with particularly complex geometries, and the thickness of the object to be examined; even the most powerful X-rays do not penetrate steel thicknesses greater than 80 mm (180 mm for gamma rays). In addition, there are the inevitable problems related to radiation protection safety.
AVAILABLE EQUIPMENT
1x Directional unit 350 kV
1x Panoramic unit 300 kV
1x Panoramic unit 250 kV
2x Directional units 200 kV
1x Directional unit 160 kV
For greater thicknesses, such as forgings and welded plates for the nuclear sector, a linear accelerator with a power of 2 MeV is used.
Centrotest S.r.l has 2 bunkers for carrying out radiographic testing and storing the radiogenic equipment, and 2 laboratories (1 of which is mobile) for film development.
MAIN REFERENCE STANDARDS
EN462, EN 1435, EN 12517, EN 17636
ASME V Art. 2
ASTM E 1742, ASTM E 747
Centrotest Srl operates throughout Italy with 2 branches: one in Terni and one in Milan (San Giuliano Milanese).
ISO 9001:2008
ISO 14001:2004
OHSAS 18001:2007
REGISTERED AND OPERATIONAL OFFICE: Via Gabelletta 197/B Terni (TR)
NARNI BRANCH: Strada di Maratta Bassa, 48 05035 Narni (TR)
BRANCH FOR NORTHERN ITALY: Via Molise 4, 20098 San Giuliano Milanese (MI)