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Superconducting joints are one of the key technologies to make Ba1-xKxFe2As2(Ba-122) superconducting wires or tapes for high-field applications. Herein,superconducting joints were fabricated by a simple cold-pressing method, andthe joint resistance of the iron-based superconducting joint was estimated forthe first time. The superconducting properties, microstructures, and elementsdistribution in the joint regions were investigated. At 4.2 K and 10 T, atransport critical current Ic of 105 A for the joint was obtained, and thecritical current ratio (CCR= Ic-joint/Ic-tape) of the joint was 94.6%. On theother hand, the joint show very low joint resistance of 2.7x10^-13 ohm inself-field at 4.2 K. Among iron-based superconductors (IBS), this work is thefirst to successfully realize a superconducting joint with such high CCR andlow joint resistance. This work shows great potential to apply Ba-122 in arange of practical applications, where superconducting joints are essential.

High-performance Ba1-xKxFe2As2 superconducting joints for persistent current operation