New projects in the field of ultrasonic testing – FMC/TMC

New projects in the field of ultrasonic testing – FMC/TMC

By Cyrielle FOURNIER

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Commission V "NDT and quality assurance of welded products" worked on 2 new proposals related to Full Matrix Capture (FMC) and Total Focusing Method (TFM) technology:

- Non-destructive testing - Ultrasonic testing - General use of FMC/TFM technique, which is a general project, and

- Non-destructive testing of welds -- Ultrasonic testing -- Use of (semi-) automated FMC/TFM technology, specific to welds.

The FMC is a specific acquisition methodology applied on...

The FMC is a specific acquisition methodology applied on Phased Array UT probes associated to a specific processing called TFM. FMC consists in recording all the ultrasonic signals from all the possible pairs of transmitting-receiving elements on the array. Each element is successively fired and at each step the signals received on all the active elements are recorded. The outcome of this operation is the “full” matrix of signals.

The application of TFM/FMC has been booming in many industrial fields and more and more dedicated equipment are available on the market.

There is now a strong need to promote the adoption of good practice for this emerging technique either at the manufacturing stage than for in-service inspection of existing plant or for repairs. That is why a set of 2 standards related together and to ISO 5817, "Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections"  is now needed.

A key benefit of using FMC/TFM ultrasonic technique is that the area within the volume of the component being inspected is presented as an image, which the system has created by synthetic focusing the received sound field at each pixel. So characterisation of indication is easier and more accurate and testing of complex geometries may be addressed more easily.

Both projects will developed in IIW, Commission V, in association with ISO/TC 135/SC 3 "Ultrasonic testing" and ISO/TC 44/SC 5 " Testing and inspection of welds". For any information, please contact Mrs Cyrielle FOURNIER (cyrielle.fournier@afnor.org).