Vacuum electron beam welding method of NbTi/Cu superconduction composite sheath

Abstract

The invention discloses a vacuum electron beam welding method of a NbTi/Cu superconduction composite sheath. An upper cover, a lower cover, a oxygen-free copper sheath and a core rod of the NbTi/Cu multi-core superconduction composite sheath are cleaned and dried, the core rod is placed in the oxygen-free copper sheath to be assembled to obtain a sheath body, one end of an air extraction nozzle is inserted into a center hole of the cleaned upper cover to perform vacuum electron beam welding, the air extraction nozzle, the sheath body and the lower cover are placed together in a furnace chamber of a vacuum electron beam welder to perform vacuuming, the lower cover is tightly abutted, the sheath body is rotated at a uniform speed, eight-point positioning welding is performed on positions of combined gaps of the upper cover, the lower cover and the sheath body, primary vacuum electron beam sealing welding is performed, secondary sealing welding is performed, the welded superconduction composite sheath is subjected to vacuum cooling in the vacuum electron beam furnace chamber for one to eight hours, then the superconduction composite sheath is taken out of the furnace chamber, finally vacuuming deairing is performed, and the air extraction nozzle is subjected to cold welding and sealing welding after the deairing is finished. The process is stable, the welding quality is good, and the rate of finished products of obtained superconduction composite wires is high.

Description

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AI Technical Summary

Benefits of technology

In this new technology for making strong conductors by combining two different materials together at very low temperatures (<300° C.) without melting them or causing damage during manufacturing processes. It allows for more precise control over how much energy can be used compared to traditional methods like fusion bonding which require excessive heat input from outside sources.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the efficiency and accuracy during producing multiple cores with high performance materials such as niobium titanate (Nb) or tantalum nitride (Ta). While traditional methods involve individually packaging each component separately beforehand, these techniques have limitations due to factors like oxygen exposure that can affect the properties of certain components overtime causing corrosion. Therefore, there needs an improved way to protect the outer surface of the metal material inside the package without compromising its effectiveness.