1.1 这种做法 2. 描述了通过搜索装置与管道或管子之间的相对运动进行扫描来检测焊接管道和管子的焊缝和相邻热影响区中不连续性的一般超声波检测程序。当使用接触式或非聚焦浸入式搜索装置时，本规程适用于具有规定外径的管状产品 ≥ 2英寸。( ≥ 50 mm）和规定壁厚 1. / 8. 至1 1. / 16 在里面（3至27毫米）。当使用适当聚焦的浸入式搜索装置时，这种做法也适用于直径较小和壁较薄的材料。当使用接触式或浸入式相控阵搜索单元时，本规程也可适用于上述外径和壁厚的材料。 注1: 当使用接触式或非聚焦浸入式搜索装置时，在检查接近规定下限的管道时，应采取预防措施。 搜索单元尺寸、频率、薄壁厚度和小直径的某些组合可能会产生不需要的声波，从而产生错误的检查结果。 1.2 根据本规程进行检查的所有材料表面应清洁，无氧化皮、污垢、毛刺、熔渣、飞溅物或其他干扰检查结果的情况。焊缝的配置必须确保其反射不会产生干扰信号。通常需要对内表面和外表面焊道进行处理，如修整（“划痕”）或轧制，以去除可能导致虚假反射的突起。 1.3 本惯例未建立验收标准；它们必须由使用方指定。 1.4 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。 1.5 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 本规程旨在概述通过超声波脉冲检测焊接不连续性的程序，如未熔合、针孔、未焊透、纵向裂纹、孔隙度和夹杂物- 反射法。

1.1 This practice 2 describes general ultrasonic testing procedures for the detection of discontinuities in the weld and adjacent heat affected zones of welded pipe and tubing by scanning with relative motion between the search unit and pipe or tube. When contact or unfocused immersion search units are employed, this practice is intended for tubular products having specified outside diameters ≥ 2 in. ( ≥ 50 mm) and specified wall thicknesses of 1 / 8 to 1 1 / 16 in. (3 to 27 mm). When properly focused immersion search units are employed, this practice may also be applied to material of smaller diameter and thinner wall. When contact or immersion phased array search units are employed, this practice may also be applied to material of above-mentioned outside diameters and wall thicknesses. Note 1: When contact or unfocused immersion search units are used, precautions should be exercised when examining pipes or tubes near the lower specified limits. Certain combinations of search unit size, frequency, thin–wall thicknesses, and small diameters could cause generation of unwanted sound waves that may produce erroneous examination results. 1.2 All surfaces of material to be examined in accordance with this practice shall be clean from scale, dirt, burrs, slag, spatter, or other conditions that would interfere with the examination results. The configuration of the weld must be such that interfering signals are not generated by reflections from it. Treatment of the inner surface and outer surface weld beads such as trimming (“scarfing”) or rolling is often required to remove protuberances that could result in spurious reflections. 1.3 This practice does not establish acceptance criteria; they must be specified by the using parties. 1.4 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. 1.5 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 purpose of this practice is to outline a procedure for detecting weld discontinuities such as lack of fusion, pin holes, lack of penetration, longitudinal cracks, porosity and inclusions by the ultrasonic pulse-reflection method.