Low resistance, helium leak tight, cryo-stable superconducting (SC) joints with sufficient strength to absorb thermo-mechanical stress are commonly used in large sized magnets, their feeders and current leads (CL). Among high temperature superconductor (HTS), cuprate oxide based tapes are the popular options for CL applications. Recently composite magnesium diboride (MgB₂) wires with superconducting transition temperature of 39 K are getting wide attention for low field applications. Use of Monel as a sheath material in MgB₂ wires poses a major challenge while fabricating SC joints due to its low wettability and flowability using PbSn alloy based solder material. To tackle this issue, we exploited Cu electroplating technique to ease fabrication of MgB₂ – NbTi: Cu as well as HTS: Cu - MgB₂ joints. The details of in-house electroplating technique developed to fabricate bottom joints of BSCCO-2223 based HTS CL using MgB₂ wires are reported. To study the morphology of such Cu coated MgB₂ wires microstructural investigation is performed using Scanning Electron Microscope with energy dispersive X-ray spectroscopy (SEM/EDX) analysis. Similar Cu plated MgB₂ wires are used to fabricate bottom joints of a prototype HTS CL. The performance of joints is preliminary attempted in the HTS CL test experiment up to 1.5 kA at 20 K.

具有足够强度以吸收热机械应力的低电阻、氦气密封、低温稳定的超导 (SC) 接头通常用于大型磁体、它们的馈线和电流引线 (CL)。在高温超导体 (HTS) 中，基于氧化铜的胶带是 CL 应用的热门选择。最近，超导转变温度为39 K的复合二硼化镁（MgB ₂）线材在低场应用中受到广泛关注。_{在 MgB 2}导线中使用蒙乃尔合金作为护套材料在制造 SC 接头时提出了一项重大挑战，因为它使用基于 PbSn 合金的焊料材料具有低润湿性和流动性。为了解决这个问题，我们利用铜电镀技术来简化 MgB _2的制造– NbTi：Cu 以及 HTS：Cu - MgB ₂接头。_{报告了使用 MgB 2}线制造 BSCCO-2223 基 HTS CL 底部接头的内部电镀技术的详细信息。为了研究这种Cu 涂覆的MgB ₂线的形态，使用具有能量色散X射线光谱(SEM/EDX)分析的扫描电子显微镜进行微观结构研究。类似的镀铜 MgB ₂线用于制造原型 HTS CL 的底部接头。接头的性能在 HTS CL 测试实验中进行了初步尝试，在 20 K 时高达 1.5 kA。