TWI

An experimental canister welding machine was developed in order to evaluate FSW as a method of welding the copper canisters used in the long term storage of nuclear waste. Preliminary trials involved the development of a machine with sufficient stiffness to cope with the FSW forces and investigation of temperature measurement as a means of indicating weld quality. Testing was carried out using simulated canister lids in order to develop suitable tool designs and welding conditions. Tool development included investigations looking at probe and tool shoulder design and evaluation of potential probe materials such as cemented carbides, ceramics and cubic boron nitride, refractory materials and superalloys. Radiographic, ultrasonic and eddy current methods were evaluated as possible nondestructive weld inspection methods. Welding was carried out on a real canister lid.

4th International Symposium, 14-16 May 2003, Session 3B: Dissimilar & Special Materials 1, Paper 01