In high temperature superconducting (HTS) applications, joining two wires to extend the entire length is considered as an essential process. Many jointing techniques have been developed in recent years, and have made some progress in joining two HTS virgin tapes with 4mm width and 0.15mm thickness. However, the recently developed soldered-stacked-square (3S) HTS wires with broad engineering implications do not have applicable methods of joining. In this paper, we proposed a novel technique to join two 3S wires by soldering and measured joint resistance to demonstrate its applicability of engineering. By joining separate layers in 3S wires using spot welder in advance and then coating these layers in the solder bath afterwards, this method allows making joints and manufacturing 3S wires simultaneously. More specification of the jointing methods of two 3S wires and the results of experiments are also presented and discussed.
This work was supported in part by the National Natural Science Foundation of China (Project 51577119).

Keywords: HTS wires, Joints