Study on Novel Jointing Technique of Soldered-stacked HTS Wires

Abstract

In high temperature superconducting (HTS) applications, joining two HTS wires is considered as an essential process for extending the available length. Many soldering and diffusion joints have been designed in recent years, but these joints mainly focused on joining two HTS virgin tapes with 4mm width and 0.15mm thickness. As for the recently developed soldered-stacked (SS) HTS wire, it does not have applicable methods of joining. In this paper, we proposed a novel technique to join two SS wires by soldering and stacking, and measured the joint resistance to demonstrate its feasibility of engineering. First, we join separate layers in SS wires using spot-welding machine. Second, we coat these layers in the solder bath. This method allows making joints and manufacturing SS wires simultaneously. This work will introduce the specification of this jointing method for SS wire, and the related experimental results will provide a reference for the SS wire joint fabrication in the future.