19芯Fe/Cu包套MgB2超导线制备是以单芯Fe/Cu线组装后，再经过机械拉拔工序获得。利用电磁涡流技术可检测单芯Fe/Cu线内部的缺陷。通过电子扫描电镜(SEM)分析发现，相对于未检测到缺陷的单芯线，有缺陷的单芯线组装、拉拔后获得的19芯Fe/Cu超导线内部芯线排布均匀性差，部分芯线Fe层破损严重，将影响超导线质量。涡流检测方法有利于控制多芯超导线质量。

19-filament MgB2 superconductor wire had been successfully prepared via restacking with mono filament Cu/Fe wire and drawing process. Inner flaw of the single-core wire could be measured by eddy current testing system. The intersection SEM results showed that compared to the better one, the wire with inner flaw will be liable to result into poor quality of 19-filament MgB2 superconductor wire, for example, worse distributed core, fragile Fe layer inside the wire, which will depress the superconducting properties much. So, the quality of 19-filament Fe/Cu MgB2 superconductor wire can be better controlled aided by eddy current inspection technology.