Ultrasonic Testing of Aviation Materials with 2D Arrays applying DDF in Transmission and Reception

Chinta, Prashanth Kumar; GE Sensing & Inspection Technologies GmbH; Germany

Standop, S.; GE Sensing & Inspection Technologies GmbH; Germany
Koers, D.; GE Sensing & Inspection Technologies GmbH; Germany
Falter, S.; GE Sensing & Inspection Technologies GmbH; Germany

ID: ECNDT-0541-2018
Download: PDF
Session: Aerospace 5
Room: G1
Date: 2018-06-13
Time: 11:30 - 11:50

Highly stressed components, in particular for applications in aviation, require sensitive inspection in order to avoid smallest inclusions within the material. This is generally carried out by full body scans applying focused transducers at high frequencies. While this is easily possible for fine grained materials, like forged steels, it may be an issue for other materials, e.g. titanium alloys, Ni-based alloys or duplex steels, which become more and more popular.

Several approaches are applied to overcome these restrictions, one of which are sets of specially calculated transducers, so called Fermat-probes. Usually multiple scans are required to fully cover the testing range, which directly affects the productivity. Another approach has been realized by GE with a 2D array and an instrument being capable to include a 4 Zone transmit DDF and continuous reception DDF. Here the inspection can in principle be performed in a single scan. The shape of the transducer however limits its application to certain specimen geometries.

Herein, we present an alternative approach also using a 2D array, but allowing a flexible transmit DDF targeting for different depths and directions in combination with a post-acquisition data processing in order to allow for a zone based DDF and DDA. This significantly simplifies the processing effort and reduces it to a parametrization within the high definition industrial ultrasound evaluation electronics USIP|xx supplied by GE, thus avoiding complex multi-transducer solutions as well as highly sophisticated image processing algorithms.