Development of joining technology between FeCrAl alloys and fusion reactor piping materials

The use of FeCrAl alloys as an inner lining for piping materials for fusion reactors is being considered. The FeCrAl alloy/SUS316L joints were explosion welded to avoid the influence of an oxide film at the joint interface. The joint length could be increased by increasing the charge ratio or reducing the material thickness. Together with the microstructure observation, hardness test, 4-point bending test and heat treatment test results, it is clear that explosion welding is suitable for joining FeCrAl-ODS and SUS316L.