Feasibility study of the characterization of planar defects in a circular weld with TFM

Bannouf, Souad; EXTENDE; France

Bannouf, S.; EXTENDE; France
Lonne, S.; EXTENDE; France
Gibert, C.; EDF CEIDRE; France
De Roumilly, L.; EDF CEIDRE; France

ID: ECNDT-0261-2018
Download: PDF
Session: PAUT & TFM 2
Room: G2
Date: 2018-06-11
Time: 15:40 - 16:00

This paper reports results from a feasibility study carried out by EXTENDE and EDF CEIDRE about characterization of planar defects located in a welded cylindrical specimen with the Total Focusing Method (TFM). First, the characterization of EDM notches in a welded part with a complex internal profile is evaluated by simulation. The simulated results are compared to experimental ones and show good agreement. A characterization procedure for planar defects with TFM is proposed. It is applied to fatigue cracks and shows convincing results. Detection but also characterization of planar breaking backwall defects seem possible with TFM when using LL direct mode reconstruction of the region of interest. However, corner echo mode reconstruction may also complete and confirm the defect characterization depending on some conditions detailed in this paper (probe positioning, geometry knowledge, …).