29th Symposium on Fusion Technology (SOFT 2016)

P4.140 Application of Ultrasonic technology in CFETR vacuum vessel R&D

8 Sep 2016, 14:20

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 140

Poster G. Vessel/In-Vessel Engineering and Remote Handling P4 Poster session

Speaker

Wang Rui (Institute of Plasma Physics Chinese Academy of Sciences)

Description

Full penetration welding and 100% volumetric examination of weld joints are strictly required for all welds of pressure retaining parts of the CFETR Vacuum Vessel (VV) according to the design manual. However not every welding joint can be tested using RT method due to component structure and welding position. Therefore, the ultrasonic testing (UT) has been selected as an alternative method. Considering the misjudgment and undetectable of defects in the austenitic stainless steel welding by applying the traditional ultrasonic testing method, the most advanced phase-array ultrasonic technology (PAUT) has been chosen for our testing procedure design. By using the ultrasonic simulation, the most adapted inspection method is determined at the first time. Applying of phased array dynamic focusing technique shows its advantage in this application. The precision of the defect position and the signal/noise(S/N) have be improved comparing the conventional UT method. This work shows that the PAUT technique has excellent detectability and applicability for the austenitic stainless steel weld in the CFETR VV.