Studies Of Broadband Ultrasonic Testing On Bonding Quality In First Wall Shield Blanket Of ITER

International Thermonuclear Experimental Reactor (ITER) is an international cooperative project. One of its components, the First Wall (FW) functioning as neutron shielding and cooling, is an important part. FW is made up of beryllium (Be), copper (Cu) alloy and stainless steel (SS), there was SS cooling tube in the Cu alloy. The thickness of Be, Cu alloy and SS are respectively 10mm,22mm,49mm.Before FW is going into operation, it's necessary to actualize Nondestructive testing (NDT). Both in and out of china, some institutions have studied on the NDT for FW of ITER, and they got good experimental results. But they mainly studied on the fatigue crack of FW mock-ups both before and after heating sink: such as the fatigue cracks on the face of Be, the longitudinal fatigue cracks in the interface of SS cooling tube and Cu. But the studying of NDT on the horizontal non-bonding defects has not brought to people's attention. This dissertation aims at the question, mainly studies on the broad-band ultrasonic NDT of bonding quality of Be/Cu's and SS tube/Cu interface.In the studying on broad-band ultrasonic NDT of Be/Cu's bonding quality, machining a Be/Cu mock-up is necessary. But Be is venomous, and it's price is costly, considering in the ultrasonic testing, the most important factor is acoustic impedance, therefore the Be/Cu mock-ups is made up of tin (Sn)/steel, because the acoustic impedance of Be and Cu is respectively similar with Sn and steel. The ultrasonic testing feasibility of the bonding quality of Be/Cu is analyzed theoretically in this dissertation firstly, the theoretical result indicates that broadband ultrasonic NDT can be used to test the bonding quality of Be/Cu. Followly, the feasibility of Sn/steel mock-ups replaced Be/Cu is proved theoretically. And then the experimental results of mock-ups are presented. The results of theoretical analyzing and experiments indicate that only broadband ultrasonic NDT can be used to test the bonding quality of Be/Cu.In the studying on broad-band ultrasonic NDT of stainless steel (SS) tube/Cu's bonding quality, the internal diameter of SS tube is small, but testing must be actualized in the tube. Aiming at above, this dissertation designs a acoustic mirror device to satisfy the demand of SS tube/Cu's bonding quality. The experimental results indicate that this device can be used to test SS tube/Cu's bonding quality.