Visual examination

The visual controls groups all non destructive tests using electromagnetic rays in the visible spectrum (between 400 and 700 nm. A specialist analyses the reflection on the parts with a set light allowing detection of defects.

The following defects are identified: surface defects (cracks, scratches, porosity, corrosions …)

Dye Penetrant

This process is based on a liquid (or a gaz) resurgence from a crack in which it previously was, thanks to impregnation phase. The colored lines and discontinuities show on a white or black area, showing all defects.

It is one of the oldest forms of non destructive examination dating as far as 1880.

Magnetic particle inspection

The inspection is done by a magnet set on a part with a magnetic field. When discontinuities show, magnets fields forces lines are distorted.

Magnetic particle inspection is used to detect surface defects, showing or under the part’s skin (up to a few millimeters in some cases) but exclusively for ferromagnetic material.

It is complementary to dye penetrant inspection but is quicker (a few minutes compared to 1 hour)

Ultrasonic testing

This control is based on a ultrasonic wave emitted in the part to be controlled and then analyzed as it interfere with the material. There are many different technologies derived from this general principle.