29th Symposium on Fusion Technology (SOFT 2016)

P1.135 Ultra-sensitive ultrasonic testing method on bi-metallic explosion plate for ITER low-temperature superconducting joint box

5 Sep 2016, 14:20

1h 40m

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

Board: 135

Poster G. Vessel/In-Vessel Engineering and Remote Handling P1 Poster session

Speaker

Jiang Beiyan (Hefei Juneng Electro Physics High-tech Development Co.)

Description

The cryogenic superconducting joint box is an important part of ITER HTS current leads, which is made of Copper-316L bi-metallic explosion bonded plate. The bimetal interface of the joint has the direct effect on the mechanical properties of the joint and testing performance at low temperature. This paper describes work on the development of water immersion ultrasonic testing technology, and its application on bi-metallic explosion bonded plate. It also give a comparing results on detecting the line segments and arc segments from copper side by using single crystal focusing probe and linear phased array probe. Assessment criteria was defined by analyzing signals which is produced by interface and the defects. Experimental results indicate that the method can meet the requirement as mentioned that the absence of defects of area > 2mm² in the final box should be confirmed.