The ability to align ex-situ inspection data of an additively manufactured (AM) part to its build geometry can be helpful, for example, to correlate observed in-situ monitoring events or features to measured discontinuities, such as pores and cracks, in ex-situ inspection. In some cases, the original part design does not lend itself to such an alignment due to the absence of datum surfaces. In this study, the concept of incorporating inclined, cylindrical protrusions as reference fiducials in the design of cylindrical AM test coupons is investigated. Six coupons with proposed fiducials were built and inspected using X-ray computed tomography (CT). Dimensional measurements performed on the fiducials expose shortcomings in the proposed fiducial design—mainly a result of limited dimensional fidelity of small features by AM—and allow us to make suggestions on how the design can be improved. Nevertheless, an alignment scheme based on the reference fiducials is compared with an approach based on inherent coupon surfaces on layer-wise porosity measurements by X-ray CT on one of the test coupons.

将增材制造（AM）零件的异地检查数据与其构造几何形状对齐的能力可能会有所帮助，例如，可以将所观察到的原位监测事件或特征与所测量的不连续性（例如孔和裂缝）相关联。现场检查。在某些情况下，原始零件设计由于没有基准表面而无法进行这种对齐。在这项研究中，研究了在圆柱AM测试试样的设计中引入倾斜的圆柱突起作为基准的概念。使用X射线计算机断层扫描（CT）构建并检查了六个带有建议基准的试样。对基准进行的尺寸测量暴露了所提议的基准设计中的缺点（主要是AM对小特征的有限尺寸保真度的结果），并允许我们就如何改进设计提出建议。然而，将基于参考基准的对准方案与基于固有试样表面的方法进行了比较，该方法是通过在其中一个试样上进行X射线CT进行分层孔隙度测量的。