Study of Welding Joint Resistance of REBCO Wires for High Temperature Superconducting Magnet

A high-temperature superconducting (HTS) motor was designed, which employs the HTS wires in the rotor field windings. To reduce the welding joint resistance of the wires, a simple and efficient welding method is developed, and the welding process suitable for 2G and 1G HTS wires is summarized as follows. First, the welding process was obtained by the tests, the results show that the welding temperature is chosen to be 220°C, the lap length is chosen to be 160mm, and the resistance of the joint can reach 10
^-9
Ω. Second, the resistance influenced by the radius was analyzed by the finite element method. The results show that there might be little decrease in the critical current of the joints. Last, a 2G HTS magnet was manufactured to verify whether the joints made by the method can meet the requirements of bending deformation in the HTS magnet winding process. The results show that the welding process can satisfy the requirements, and provide an important reference for subsequent work.