  Superconducting joints are essential for iron-based superconductor's
applications in future. In this study, a process for fabricating
superconducting joints between Sr1-xKxFe2As2 (Sr-122) tapes is developed for
the first time. The Ag sheath was peeled off from one side of each sample. The
exposed superconducting parts of the two tapes were joined and wrapped again
with Ag foil. The diffusion bonding of the iron-based superconducting joint was
achieved by hot-pressing process in Argon atmosphere. The superconducting
properties, microstructures and the elements distribution of the joint regions
had been investigated. The pressure and pressing times were optimized in order
to enhance the transport current of the joints. At 4.2 K and 10 T, a transport
critical current Ic of 57 A for the joint was obtained, which is approximately
63.3% of the current capacity of the tapes themselves. Furthermore, the joint
resistances dV/dI were estimated from the V-I curve of the joints and the
calculated joint resistances values are below 10^-9 Ohm. These results
demonstrate that the hot pressing was useful for fabricating the
superconducting joint samples.
