1.1 本规范 2. 涵盖了用于检测本质上非层状的内部不连续性和钢板表面缺陷的超声波角束程序和验收标准。本规范仅作为提供直波束超声波检查的规范的补充。 注1: 本质上是层状的内部不连续性是指其主平面平行于板的主平面的不连续性。 1.2 根据本规范进行检查的个人应根据最新版ASNT SNT-TC-1A或同等公认标准的要求进行资格认证。等效标准是指涵盖超声波无损检测候选人资格和认证的标准，并且是买方可接受的标准。 1.3 以英寸磅单位或国际单位制表示的数值应单独视为标准。 在正文中，国际单位制显示在括号中。每个系统中规定的数值并不完全相等；因此，每个系统必须独立使用。将两个系统的值组合在一起可能会导致不符合规范。 1.4 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。

1.1 This specification 2 covers an ultrasonic angle-beam procedure and acceptance standards for the detection of internal discontinuities not laminar in nature and of surface imperfections in a steel plate. This specification is intended for use only as a supplement to specifications which provide straight-beam ultrasonic examination. Note 1: An internal discontinuity that is laminar in nature is one whose principal plane is parallel to the principal plane of the plate. 1.2 Individuals performing examinations in accordance with this specification shall be qualified and certified in accordance with the requirements of the latest edition of ASNT SNT-TC-1A or an equivalent accepted standard. An equivalent standard is one which covers the qualification and certification of ultrasonic nondestructive examination candidates and which is acceptable to the purchaser. 1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. 1.4 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.