焊接点无损检测.超声波探伤法.验收标准

[中文适用范围]： 本文件规定了铁素体钢全熔透焊接接头的两个超声波验收等级，称为验收等级 2 (AL 2) 和验收等级 3 (AL 3)，其对应的 D 级不包括在本文件中，因为超声波检测通常是对于这种焊接质量没有要求。 这些验收等级适用于根据 ISO 17640 进行的测试。 本文件适用于厚度为 8 毫米至 100 毫米的全熔透铁素体钢焊缝的测试。 它也可以用于其他类型的焊缝、材料和厚度，前提是在执行测试时必要考虑组件的几何形状和声学特性，并且可以采用足够的灵敏度来使本文件的验收水平达到被应用。 本文档中使用的探头标称频率在 2 MHz 至 5 MHz 之间，除非衰减或更高分辨率的要求需要其他频率。 仔细考虑将这些接受水平与此范围之外的频率结合使用非常重要。 [外文原描述]： ISO 11666:2018 specifies two ultrasonic acceptance levels known as acceptance level 2 (AL 2) and acceptance level 3 (AL 3) for full penetration welded joints in ferritic steels, which correspond to ISO 5817:2014, quality levels B and C. An acceptance level corresponding to ISO 5817:2014, quality level D is not included in this document, as ultrasonic testing is generally not requested for this weld quality. These acceptance levels are applicable to testing carried out in accordance with ISO 17640. ISO 11666:2018 applies to the testing of full penetration ferritic steel welds, with thicknesses from 8 mm to 100 mm. It can also be used for other types of welds, materials and thicknesses, provided the tests have been performed with necessary consideration of the geometry and acoustic properties of the component, and an adequate sensitivity can be employed to enable the acceptance levels of this document to be applied. The nominal frequency of probes used in this document is between 2 MHz and 5 MHz, unless attenuation or requirements for higher resolution call for other frequencies. It is important to consider the use of these acceptance levels in conjunction with frequencies outside this range carefully.