1.1 本指南涵盖了通过将脉冲超声波传输到材料中并观察反射波的指示来对大块材料或零件进行接触超声检查的程序。本指南仅涵盖一个搜索单元同时用作发射器和接收器（脉冲回波）的检查。本指南包括一般要求和程序，可用于检测不连续性、定位距参考点的深度和距离，以及与参考标准相比对不连续性的大小进行相对或近似评估。 1.2 本指南补充了实践 E114 通过为检查系统的选择和标准化以及所获得的适应症的评估提供更详细的程序。 1.3 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.4 本指南并非旨在解决与其使用相关的所有安全问题（如有）。本指南的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 6.1 本指南提供了用于检测和定量评估材料中不连续性的接触直梁检测的应用程序。 6.2 尽管并非本指南的所有要求都能普遍适用于所有考试、情况和材料，但它确实为用户之间建立合同标准提供了基础，并可作为为特定应用制定详细规范的通用指南。 6.3 本指南旨在评估光束垂直于入射表面可检测到的不连续性。如果要考虑不连续性或其他方向，则需要替代扫描技术。

1.1 This guide covers procedures for the contact ultrasonic examination of bulk materials or parts by transmitting pulsed ultrasonic waves into the material and observing the indications of reflected waves. This guide covers only examinations in which one search unit is used as both transmitter and receiver (pulse-echo). This guide includes general requirements and procedures that may be used for detecting discontinuities, locating depth and distance from a point of reference and for making a relative or approximate evaluation of the size of discontinuities as compared to a reference standard. 1.2 This guide complements Practice E114 by providing more detailed procedures for the selection and standardization of the examination system and for evaluation of the indications obtained. 1.3 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 This guide 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 guide to establish the appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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 ====== 6.1 This guide provides procedures for the application of contact straight-beam examination for the detection and quantitative evaluation of discontinuities in materials. 6.2 Although not all requirements of this guide can be applied universally to all examinations, situations, and materials, it does provide basis for establishing contractual criteria between the users, and may be used as a general guide for preparing detailed specifications for a particular application. 6.3 This guide is directed towards the evaluation of discontinuities detectable with the beam normal to the entry surface. If discontinuities or other orientations are of concern, alternate scanning techniques are required.