Electron beam welding of copper‐niobium microcomposites for pulsed power applications

Abstract

The main objective of this work is to explore the possibility of applying electron beams to connect copper‐niobium conductors. Electron beam welding of copper–niobium microcomposite wires was investigated. The evaluation of welded joint properties was carried out according to the same methodology applied to contact electrical connections. The major electrical and mechanical properties of welded joints were established. The microscopic examination of the joint cross‐section showed that welded joints of copper‐niobium conductors have minimal thermal effects on the structure of the conductor and on the propagation of welding defects thanks to the welding in a vacuum. According to the non‐destructive radiographic test, the joint structure does not have welding defects. The difference in electrical resistances of the conductor and welded joint was below 20 %. The welded joint can withstand the maximum load, which is equal to 31.25 % of the load‐bearing capacity of microcomposite conductor.