Abstract
Applicability of resistance butt welding to (Nb, Ti)3Sn multifilamentary superconducting wires was studied in both single-and seven-strand conductors, and the dominant factors for the contact resistance of those joints were investigated. Superconducting joint characteristics were partially attained in the case of welding after reaction (react & weld) and that of reaction after welding (weld & react). For react & weld joints, damaging effects on the superconducting filaments in the welding process were dominant, while for weld & react joints the degree of filament-to-filament alignment was found to be the dominant factor. In the seven-strand conductor joint case, the degree of strand-to-strand alignment at the bonding interface was found to become the dominant factor.
