Current lead joint structure and welding method thereof

Abstract

This invention provides a current lead connector structure and its welding method. The structure includes a welded tube, a current lead, a superconducting wire, and solder. The welded tube is a variable-diameter tubular structure, with the diameter gradually decreasing from the upper end to the lower end. The first section of the current lead is disposed inside the welded tube, and the second section is disposed outside the welded tube. The first section of the superconducting wire is a bare superconducting wire with its cladding removed, and the second section is a superconducting busbar with its cladding intact. The bare superconducting wire is disposed inside the welded tube and between the welded tube and the current lead, while the superconducting busbar is disposed outside the welded tube. Solder is laid inside the welded tube and completely submerges the bare superconducting wire. By heating and cooling the solder, the bare superconducting wire, the first section of the current lead, and the solder are fused together, thereby achieving the welding of the superconducting wire and the current lead. This invention solves the technical problems of high contact resistance at the solder joints, potential local hot spots, and difficulty in disassembly and assembly in existing current lead connector structures.

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