ASTM RRE3420:2024

Standard Digital Reference Images for Aluminum Fusion Welds includes one DVD which contains an installer application that will install the binary data files and image processing application to generate the digital reference images. The image processing application can generate 16-bit TIFF or DICONDE image files in either negative (film-like) or positive pixel value normalization. Each data file generates one image that is analogous to a category page in the related film Reference Radiograph adjunct (see Scope section of related standard). The "category page" image combines the various severity level images (digital radiographs) into a single progress set with a solid black framing background that separates the individual digital radiographs. There is embedded annotation at the top of the single image in the black framing that includes embedded text annotations documenting the details of the image (such as ASTM standard number and pixel spacing selected during generation). The pixel values of the digital radiographs have been normalized so that the nominal background pixel value is around 32,000. The individual radiographs are generated from digitization data of the related film Reference Radiographs; the film Reference Radiographs were scanned at 5µm pixel spacing for high resolution. The radiographs represent various types and severity levels of discontinuities in aluminum fusion welds that may be revealed by radiographic examination. These reference radiographs do not specify the acceptable level of these discontinuities; rather they provide a visual reference for communicating the acceptable level. The reference radiographs consist of a set of eight plates (8.5×11 in. (22 by 28 cm)), covering base material up to and including 0.75 in. (19 mm) in thickness.