1.1 这些数字参考图像说明了铝合金铸件中可能存在的不连续性的类型和程度。所示铸件的厚度为 1. / 4. 英寸（6.35毫米）和 3. / 4. 英寸（19.1 毫米）。 1.2 本标准的所有领域都可以在认可的工程组织和供应商之间达成协议，或接受认可工程组织的具体指导。这些项目应在采购订单或合同中说明。 1.3 单位- 以英寸-磅单位表示的值应视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准值。 1.4 这些数字参考图像并非用于说明在进行胶片射线照相时在铝合金铸件中发现的不连续性的类型和程度。如果对铝合金铸件进行胶片射线照相，请参考参考射线照相 第155页 . 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 只有软件和图像的许可副本才能用于生产检查。 ASTM/用户许可协议的副本应存档，以供审核。 注1: 这组数字参考图像包括13个数字文件、加载所需格式的软件以及加载过程的具体说明。13张参考图像显示了八个严重级别，并包含一个阶梯楔和两个线对量规的图像。可从ASTM国际总部获得，订单号:RRE2422。参考实践 2002年 有关线对轨距的详细信息。 注2: 适用于厚度达1 in.（25 mm）的铝和镁压铸件的参考射线照片包含在参考射线照片中 2005年5月 . 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 根据本标准使用参考射线照片的人员应有资格根据国家或国际公认的无损检测人员资格实践或标准进行射线照相判读，并经雇主或认证机构（如适用）认证。 所使用的实践或标准及其适用修订应在使用方之间的合同协议中确定。如果需要帮助解释适用于参考射线照片的规范和产品要求，则在做出接受/拒绝决定之前，应咨询经认证的III级人员（如果III级人员是射线照相口译员，则可能是同一个人）。 4.2 这些数字参考图像仅用于参考，但其设计使得可针对特定要求制定的验收标准可根据这些数字参考图进行规定。 图示是在设计用于形成不连续性的条件下生产的铸件的数字图像。的图像 1. / 4. -中。（6.35 mm）铸件的厚度范围为 1. / 2. -中。（12.7毫米）。的图像 3. / 4. -中。（19.1-mm）铸件的厚度范围为 1. / 2. in.，小于等于2 in.（51 mm）。 4.3 图像恶化- 许多条件会影响数字参考图像的外观和功能。例如，电气干扰、硬件不兼容以及损坏的文件或驱动程序可能会影响其外观。 ASTM标准 2002年 位于每个数字参考的右下角的线对量规可以用作通过将使用量规测量的分辨率与数字参考图像上规定的分辨率进行比较来检测图像劣化的辅助工具。如果数字参考图像的外观受到不利影响，从而影响图像的解释和使用，请勿使用数字参考图像。 4.4 认可的工程组织和供应商之间应达成协议，即供应商使用的系统能够检测和分类所需的不连续性。

1.1 These digital reference images illustrate the types and degrees of discontinuities that may be found in aluminum-alloy castings. The castings illustrated are in thicknesses of 1 / 4 in. (6.35 mm) and 3 / 4 in. (19.1 mm). 1.2 All areas of this standard may be open to agreement between the cognizant engineering organization and the supplier, or specific direction from the cognizant engineering organization. These items should be addressed in the purchase order or the contract. 1.3 Units— The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 These digital reference images are not intended to illustrate the types and degrees of discontinuities found in aluminum-alloy castings when performing film radiography. If performing film radiography of aluminum-alloy castings, refer to Reference Radiographs E155 . 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 Only licensed copies of the software and images shall be utilized for production inspection. A copy of the ASTM/User license agreement shall be kept on file for audit purposes. Note 1: The set of digital reference images consists of 13 digital files, software to load the desired format, and specific instructions on the loading process. The 13 reference images illustrate eight grades of severity and contain an image of a step wedge and two line pair gauges. Available from ASTM International Headquarters, Order No: RRE2422. Refer to Practice E2002 for line pair gauge details. Note 2: Reference radiographs applicable to aluminum and magnesium die castings up to 1 in. (25 mm) in thickness are contained in Reference Radiographs E505 . 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Personnel utilizing reference radiographs to this standard shall be qualified to perform radiographic interpretation in accordance with a nationally or internationally recognized NDT personnel qualification practice or standard and certified by the employer or certifying agency, as applicable. The practice or standard used and its applicable revision shall be identified in the contractual agreement between the using parties. If assistance is needed with interpreting specifications and product requirements as applied to the reference radiographs, a certified Level III shall be consulted before accept/reject decisions are made (if the Level III is the radiographic interpreter, this may be the same person). 4.2 These digital reference images are intended for reference only, but are so designed that acceptance standards, which may be developed for particular requirements, can be specified in terms of these digital reference images. The illustrations are digital images of castings that were produced under conditions designed to develop the discontinuities. The images of the 1 / 4 -in. (6.35-mm) castings are intended to be used in the thickness range up to and including 1 / 2 -in. (12.7 mm). The images of the 3 / 4 -in. (19.1-mm) castings are intended to be used in the thickness range of over 1 / 2 in., up to and including 2 in. (51 mm). 4.3 Image Deterioration— Many conditions can affect the appearance and functionality of digital reference images. For example, electrical interference, hardware incompatibilities, and corrupted files or drivers may affect their appearance. The ASTM E2002 line pair gauges located in the lower right hand corner of each digital reference can be used as an aid to detect image deterioration by comparing the measured resolution using the gauges to the resolution stated on the digital reference image. Do not use the digital reference images if their appearance has been adversely affected such that the interpretation and use of the images could be influenced. 4.4 Agreement should be reached between cognizant engineering organization and the supplier that the system used by the supplier is capable of detecting and classifying the required discontinuities.