1.1 本规程描述了通过将脉冲纵波通过液体耦合剂传输到材料中并观察反射波指示来对散装材料或零件进行超声波检查的程序（见 图1 ). 它仅涵盖一个搜索单元用作发射器和接收器（脉冲回波）的检查，以及被检查的零件或材料通过液柱耦合到零件或完全浸入耦合剂中的检查（任何一种方法都被视为浸入式测试）。本规程包括可用于检测不连续性和对不连续性大小进行相对或近似评估的一般要求和程序。 图1 基本浸入设置 1.2 本练习取代练习 E214年 并为检查系统的选择、标准化和操作以及所获得适应症的评估提供了更详细的程序。 1.3 单位- 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准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（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 6.1 本规程为浸入式纵波检测在材料不连续性检测和定量评估中的应用提供了指南。 6.2 虽然本规程的所有要求不能普遍适用于所有检查情况和材料，但它确实为材料供应商和买方之间建立合同标准以进行浸入式脉冲回波检查提供了基础，并可作为编写特定应用详细规范的一般指南。 6.3 本规程旨在评估在正常光束入射时可检测到的不连续性。如果担心其他方向的不连续性，则需要替代扫描技术。

1.1 This practice describes procedures for the ultrasonic examination of bulk materials or parts by transmitting pulsed, longitudinal waves through a liquid couplant into the material and observing the indications of reflected waves (see Fig. 1 ). It covers only examinations in which one search unit is used as both transmitter and receiver (pulse-echo) and in which the part or material being examined is coupled to the part by a liquid column or is totally submerged in the couplant (either method is considered to be immersion testing). This practice includes general requirements and procedures which may be used for detecting discontinuities and for making a relative or approximate evaluation of the size of discontinuities. FIG. 1 Basic Immersion Setup 1.2 This practice replaces Practice E214 and provides more detailed procedures for the selection, standardization, and operation of an examination system and for evaluation of the indications obtained. 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 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. 1.5 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 practice provides guidelines for the application of immersed longitudinal wave examination to the detection and quantitative evaluation of discontinuities in materials. 6.2 Although not all requirements of this practice can be applied universally to all examination situations and materials, it does provide a basis for establishing contractual criteria between suppliers and purchasers of materials for performing immersed pulse-echo examination, and may be used as a general guide for writing detailed specifications for particular applications. 6.3 This practice is directed towards the evaluation of discontinuities detectable at normal beam incidence. If discontinuities at other orientations are of concern, alternate scanning techniques are required.