Abstract
A new welding procedure for bulk melt-textured YBa 2Cu 3O 7 (YBCO) superconducting tiles has been developed leading to high quality joints. The welding agent consists of a YBCO–Ag composite, which has a peritectic temperature 40°C lower than YBCO. It is shown that through a proper selection of thermal treatments, the effect of Ag additives can be confined to the immediate welding zone, thus allowing a self-seeded growth process of the YBCO/Ag composite initiated at the adjacent solid YBCO crystals. Local magneto-optical observations, as well as trapped field measurements produced by circulating currents in ring samples, reveal that the critical current across the weld joint is as high as that of bulk melt-textured YBCO.
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