Testing Laboratory

At SOTEP, we have our own metallurgical laboratory. This laboratory is recognised by a world renowned aerospace engine manufacturer. All of the batches manufactured are subject to sampling inspecting in accordance with the reference standard or specification.

Moreover, at SOTEP, we have sophisticated control methods which enable us to check that manufactured products strictly comply with the requirements laid down in the specifications.

We are also able to conduct the following tests:

Mechanical tests

  • Flattening
  • Flaring
  • Bending
  • Room temperature tensile testing in accordance with NF EN ISO 6892

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Metallography

Metallurgical tests

  • Micrographie pour taille de grain et analyse de la structure micrographique des matériaux
  • Vickers hardness
  • Intergranular corrosion in accordance with ISO 3651-2, ASTM A262, ASTM G28 Method A and B, ASTM G48 Method A and B
  • Ferrite rate
  • Inclusion rate

Using a 3D test bench, SOTEP is also able to test all manufactured parts very accurately, by comparing them to the original plan (by optical or tactile test).

All the non-destructive tests (NDT) that are conducted on the tubes - Foucault Current (FC) tests and ultrasound (US) tests - are also linked to the laboratory.

To this end, SOTEP has COFREND qualified staff.

Foucault Current testing

This method involves creating - using a sensor and in electrically conductive materials - Foucault currents induced by a variable magnetic field.
These induced currents circulate locally in the material and have a distribution which depends on the excitation magnetic field, the geometry and the electrical conductivity and magnetic permeability characteristics of the part examined.
In the event of an anomaly in the part tested, their movements are disrupted, thus leading to a variation of the apparent impedance of the sensor which depends on the nature of the anomaly and its volume dimension.

It is the analysis of this impedance variation that provides useful indicators to carry out the test. The signals collected are interpreted by comparing those noted in the material tested with those of a reference part (standard part), containing anomalies representative of the phenomena tested for.

Ultrasonic testing

The principle of ultrasound testing involves emitting and propagating an ultrasonic wave in the tube to inspect, then recording and analysing the wave following its interaction with the material. When the ultrasonic wave encounters an interface separating two media with different acoustic impedances, there is reflection (echo). The receiver collects the echoes caused by reflection or diffraction on the obstacles encountered by the wave, such as defects, interfaces between materials or the surface of the part.

The signals collected are interpreted by comparing those noted in the material tested with those of a reference part (standard part), containing anomalies representative of the phenomena tested for.