Welding process of superconductive cable and box type copper connector in large high temperature superconductive current lead

Abstract

The invention discloses a welding process of a superconductive cable and a box type copper connector in a large high temperature superconductive current lead. The welding process of the superconductive cable and the box type copper connector in the large high temperature superconductive current lead includes the following steps: (1) sequentially performing an armor removal process on the surface of the superconductive cable, performing a nickel removal process on the surface of the superconductive cable by using an anti-electrolysis method, and performing a silver coating brushing process on the surface of the superconductive cable; (2) performing the silver coating brushing process on a copper face on the inner surface of the box type copper connector, and then installing three layers ofSn63Pb37 tin sheets 0.1mm in thickness and 183 DEG C in melting point on the inner surface of the box type copper connector; (3) installing the superconductive cable in the box type copper connector,and then installing a box cover on the box type copper connector; and (4) applying certain force onto the box cover, inflating a box body with protective gas, and completing a tin soldering process after heating. The welding process of the superconductive cable and the box type copper connector in the large high temperature superconductive current lead reduces the plugging rate of the superconductive cable, obtains a uniform sliver coating, obtains uniform welding thickness for the superconductive cable and the box type copper connector, achieves the high welding rate and high welding strengthfor the first layer cable, and is simple to operate and the like.

Description

technical field [0001] The invention relates to the field of thermonuclear fusion, in particular to a welding process for superconducting cables and box-type copper joints in large-scale high-temperature superconducting current leads. Background technique [0002] The working point temperature of large low-temperature superconducting magnets is generally around the temperature of liquid helium. In order to transmit current to the magnet, a component that connects the room temperature terminal to the low-temperature magnet system is required, the so-called current lead. Current leads can be divided into two types according to their structure: conventional current leads (or unary current leads or resistive current leads) and high-temperature superconducting current leads (or binary current leads or composite current leads). Conventional current leads are mainly made of copper or copper alloys, and its technology is becoming more and more mature. The current record for the larg...

AI Technical Summary

Problems solved by technology

[0010] The invention provides a welding process for a superconducting cable and a box-type copper joint in a large-scale high-temperature superconducting current lead, and solves the following problems: 1, the blocking rate of the superconducting cable is reduced; 2, the silver plating layer is uniform; 3, the superconducting The welding thickness of the cable and the box-type copper joint is uniform; 4, the welding rate of the first layer cable is high, and the welding strength is high; 5, the operation is simple, etc.

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