Long lengths of second-generation REBCO coated conductor (CC) tapes must be joined together when power cables, coils, and magnets requiring kilometer-scale lengths are fabricated. Various resistive joining techniques of CC tapes, such as soldering and diffusion reaction, have been studied. The joint method should provide good adhesion, low joint resistance ( R j ), no critical current ( I c ) degradation, cost effectiveness, and simplicity in processing. An ultrasonic welding (UW) process was developed and used to form various types of CC joint structures, such as lap- and butt-joints, using differently stabilized REBCO CC tapes. In this study, the UW process was used to form various bridge-joints of CC tapes for high-temperature superconducting coils. A mechanical-controlled soldering method which has provided a low contact resistance was also adopted for comparison. CC joints of various structures were fabricated using UW and soldering, and the ...

中文翻译：

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用于HTS线圈的超声焊接CC桥式接头的接头特性

在制造需要千米级长度的电力电缆，线圈和磁铁时，必须将较长长度的第二代REBCO涂层导体（CC）胶带连接在一起。已经研究了CC胶带的各种电阻连接技术，例如焊接和扩散反应。接合方法应提供良好的附着力，较低的接合电阻（R j），无临界电流（I c）降低，成本效益以及加工简单性。开发了一种超声波焊接（UW）工艺，并使用不同程度稳定的REBCO CC胶带来形成各种类型的CC接头结构，例如搭接和对接。在这项研究中，UW工艺用于形成高温超导线圈CC胶带的各种桥式接头。为了比较，还采用了具有低接触电阻的机械控制焊接方法。各种结构的CC接头都是使用UW和焊接制造的，并且...