Delgado, Rafael; Tecnitest Ingenieros, S.L.; Spain

Delgado de Molina, R.; Tecnitest Ingenieros; Spain
Gauna, I.; Tecnitest Ingenieros; Spain
de Matías, H.; Tecnitest Ingenieros; Spain
Guerro, J.C.; Tecnitest Ingenieros; Spain
Àlvarez, A.; Tecnitest Ingenieros; Spain
Thorpe, N.; Tecnitest Ingenieros; Spain
Acebes, M.; Tecnitest Ingenieros; Spain
Flòrez, D.; Tecnitest Ingenieros; Spain
Sánchez, M.J.; Tecnitest Ingenieros; Spain

ID: ECNDT-0330-2018
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One of the most challenging issues for automatic integration in ultrasonic systems is the coupling of the probe with the component to be tested. Most common systems use water or oil in local or total immersion.

The following paper will present an innovative dry coupling system, where no coupling media it is needed, that can be applied into different, fully automated, inspection techniques.

A particular application of this Dry contact inspection technique is MATVEL UT Nodularity control. The MatVel is an up to 8 channel state of the art digital ultrasonic nodularity control system for industrial applications in the cast iron industry; uniquely offering dry coupled ultrasonic measurement capability. The system is suitable for manual or in-line spot testing of components. This is achieved by using a customized transducer and delay line.

The MatVel combines all the functionality of an outstanding flaw detector together with specific add-ons customized for the application. The system can therefore meet the requirements for any set up, with live A-scan signal presentation and direct reading of acoustic velocity, thickness measurements and flaw (in spot) detection.

To optimize the performance of the MatVel a specific series of transducers has been developed. Depending on the thickness range of the component at the test area, there are a range of state of the art delays of differing dimensions available: interchangeable spherical, rounded tip cylindrical or thin flat. The specific design of the delay has been developed for optimum coupling, acoustic impedance matching and durability under challenging mechanical and environmental testing conditions on rough casting surfaces.