Inspection of complex shape components using real time Adaptive TFM imaging

Roy, Olivier; M2M ndt; France

Bergalonne, P.; COMEX Nucléaire; France
Roy, O.; M2M; France

ID: ECNDT-0110-2018
Session: PAUT & TFM 3
Room: G2
Date: 2018-06-12
Time: 09:00 - 09:20

Irregular shapes are very common in industrial structures, especially when it comes to pipes travelling around buildings and fields. Inspection of pipes welds is a key point for maintenance. The weld crowns make most of ultrasonic measurements very difficult to perform. We developed an adaptive technique to get rid of surface geometry irregularities and to provide reliable diagnosis from the inspection. This method is an Adaptive version of the Total Focusing Method (ATFM) already available on a rugged portable equipment. It aims to produce in two steps the profile of the component surface and the profile of its back wall, allowing to measure the residual thickness at any position under and close to the weld. Improvements have been achieved to this method to make it more robust facing various rough butt welds, and to cover larger areas in a single probe position. Results are presented to illustrate the reliability of the method applied to various profiles of butt welds.