47 Seibel, Anja Breidt, Michael Dettinger, Tanja Egly, Jörg Hähnel, Hendrik Kleffner, Carl Knie, Klaus Ratzinger, Ulrich Will, Christina PLI Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK 31st International Linear Accelerator Conference JACoW Publishing Geneva, Switzerland Liverpool, UK 10.18429/JACOW-LINAC2022-TUPOJO05 English 345 - 347 A FAIR injector linac for the future FAIR facility is under construction. In order to meet the requirements for copper plating of the CH-cavities, a variety of tests with dummy cavities has been per-formed and compared to simulation. Further dummy cavities have been produced in order to improve the welding techniques. In addition, the results on 3d-printed stems with drift tubes will be presented. "Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI." ; Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK ; 33, ; PUB:(DE-HGF)8, ; PUB:(DE-HGF)7, ; Accelerator Physics Proton and Ion Accelerators and Applications Contribution to a conference proceedings 2022 2022-08-28 - 2022-09-02 GSI-2025-00594 2022-08-28 - 2022-09-02 2022 https://repository.gsi.de/record/358539 https://doi.org/10.18429/JACOW-LINAC2022-TUPOJO05