Radiographic Testing - AeroNDI S.r.l.

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Radiographic Testing
Radiography relies on differential absorption of penetrating radiation resulting from changes in material density within the object under test. This change in density can be the result of a complete void, as can occur with either a material discontinuity or simply a normally occurring change in cross-section. Density changes can also be the result of inclusions that may be of a higher or lower density than the parent material. This variation in absorption results in varying levels of radiation passing through the object. This radiation is used to form an image using either film or a digital detector. The image is generally viewed as a 2-D gray-scale contrast map, with darker areas depicting low density (or thin) areas within the object, and lighter areas, the high density (or thick) areas.

There are many factors that contribute to the capabilities, limitations, and constraints of radiographic inspection. One of the most fundamental and most significant is the density difference between the test object and the discontinuity of interest. Equally important are the volume and/or cross-sectional area the discontinuity occupies within the object and the orientation of the discontinuity in relationship to beam of radiation. Larger density differences and larger discontinuity sizes (relative to the beam) result in higher contrast indications. As with most inspections, both the size and contrast (signal-to-noise) of an indication are the primary factors affecting inspection capability.

The radiographic control is a non-destructive method that allows you to highlight the structural defects of a material

Dendritic shrinkage of precision cast inconel

CR image of particular carbon steel

CR image of particular inconel

Radiographic inspections are generally developed to provide what is referred to as 2-2T sensitivity. This means that 2% change in thickness (again relative to the beam) will produce a measurable change in image contrast and that a void with a diameter that is 2 times (2T) that 2% thickness change will be ‘readily’ visible. However, this does not guarantee that a discontinuity of that size will be reliably detected. Again, this is dependent on signal-to-noise, which can be affected by geometry, material properties, and prior knowledge of the location and orientation of the discontinuity of interest.

Non Destructive Testing Radiographic RT
Headquarters: Via Reano, n. 6 / 8 - 10040 Rivalta di Torino (TO) - Italy
Registered office: Vittorio Emanuele II, n. 108 - 10121 Torino (TO) - Italy
Local units of Sesto Calende: Via Incasale n. 5 - 21018 Sesto Calende (VA) - Italy
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