Current lead joint structure and welding method thereof

By using a variable-diameter welded pipe structure and a welding method that involves melting and cooling solder, the problems of high contact resistance and difficult assembly/disassembly of the current lead connector structure were solved. This resulted in a low thermal resistance and a simple welding process, improving the stability and disassembly efficiency of the superconducting coil.

CN116417814BActive Publication Date: 2026-06-19HIWING TECH ACAD OF CASIC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HIWING TECH ACAD OF CASIC
Filing Date
2021-12-30
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

The existing current lead connector structure has problems such as high solder joint contact resistance, potential local hot spots, and difficulty in disassembly and assembly.

⚗Method used

The tube adopts a variable diameter tubular welded tube structure, with the bare wire and current lead of the superconducting wire placed inside and outside the welded tube. Welding is achieved by melting and cooling the solder, avoiding bending and tangling. During welding, the solder is poured in from the top end and heated and cooled. During disassembly, the solder is melted with a hot air gun.

🎯Benefits of technology

It reduces contact resistance, avoids incomplete soldering, improves the stability of the superconducting coil excitation process, simplifies the welding and disassembly process, and reduces liquid helium consumption and the risk of quench failure.

✦ Generated by Eureka AI based on patent content.

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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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