1.1 这种做法 2. 提供了在不超过93℃的温度下使用接触脉冲回波法测量材料厚度的指南 °C[200 °F]。 1.2 本规程适用于任何材料，其中超声波将在整个零件中以恒定速度传播，并且可以从中获得并解决后壁反射。 1.3 这种做法主要适用于具有平行表面的扁平部件，对具有非平行表面的部件的适用性有限- 平行或同心表面 1.2 . 1.4 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.5 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。 1.6 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====== 5.1 所述技术可间接测量温度不超过93℃的材料截面厚度 °C[200 °F]。从物体的一侧进行测量，无需进入后表面。 5.2 超声波厚度测量广泛用于许多材料的基本形状和产品、精密加工零件，并用于确定由腐蚀和侵蚀引起的工艺设备壁厚减薄。 5.3 在引用的参考文献中，可以找到用于确定特定应用的超声波测厚仪的能力和局限性的建议。 7. , 8.

1.1 This practice 2 provides guidelines for measuring the thickness of materials using the contact pulse-echo method at temperatures not to exceed 93 °C [200 °F]. 1.2 This practice is applicable to any material in which ultrasonic waves will propagate at a constant velocity throughout the part, and from which back wall reflections can be obtained and resolved. 1.3 This practice is primarily for flat components with parallel surfaces and has limited applicability for components with non-parallel or concentric surfaces per 1.2 . 1.4 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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 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 ====== 5.1 The techniques described provide indirect measurement of thickness of sections of materials not exceeding temperatures of 93 °C [200 °F]. Measurements are made from one side of the object, without requiring access to the rear surface. 5.2 Ultrasonic thickness measurements are used extensively on basic shapes and products of many materials, on precision machined parts, and to determine wall thinning in process equipment caused by corrosion and erosion. 5.3 Recommendations for determining the capabilities and limitations of ultrasonic thickness gages for specific applications can be found in the cited references. 7 , 8