无损检测 超声波检测 垂直于表面的不连续性检测

[中文适用范围]： 本标准涵盖了超声波检测中针对表面垂直不连续性检测的具体要求和技术规范，包括检测设备、人员资格、灵敏度调节等关键要素。它旨在为制造商、检测机构和相关行业提供统一的技术依据，确保检测结果的准确性和可靠性。 [外文原描述]： This document specifies principles for the tandem technique and the longitudinal-longitudinal-transverse wave (LLT) technique for detection of discontinuities perpendicular to the surface or almost perpendicular to the surface. The general principles for ultrasonic testing of industrial products are described in ISO 16810. The tandem or LLT techniques can be used for the detection of embedded planar discontinuities. This document gives guidelines for the testing of metallic materials with a thickness between 40 mm and 500 mm with parallel or concentric surfaces. The procedures provided in this document can be used for testing of other materials or smaller thickness if special measures are taken according to a written testing procedure. Phased array techniques can also be applied for the tandem technique and the LLT technique, but additional steps or verifications can be needed.