ISO 17640:2018 焊接的无损检测 超声波检测 技术、检测水平和评定

标准编号：ISO 17640:2018

中文名称：焊接的无损检测 超声波检测 技术、检测水平和评定

英文名称：Non-destructive testing of welds — Ultrasonic testing — Techniques, testing levels, and assessment

发布日期：2018-10

标准范围

本文件规定了厚度金属材料熔焊接头的手动超声波检测技术≥8 mm，在0°C至60°C的物体温度下显示出较低的超声波衰减（尤其是由于散射）。主要用于焊接材料和母材均为铁素体的全熔透焊接接头。如果本文件中规定了与材料相关的超声波值，则这些值基于纵波的超声波声速为（5920±50）m/s，横波的超声波声速为（3255±30）m/s的钢材。本文件规定了四个测试级别，每个级别对应不同的缺陷检测概率。附录A中给出了选择A、B和C级测试的指南。本文件规定用于特殊应用的D级测试要求应符合一般要求。只有在规范规定的情况下，才能使用D级测试。这包括铁素体钢以外的金属试验、部分熔透焊缝试验、自动化设备试验，以及在0°C至60°C范围外的物体温度下进行的试验。本文件可用于评估不连续性，用于验收目的，方法如下:a） 主要基于不连续的长度和回波幅度进行评估；b） 基于探头移动技术对不连续性进行表征和尺寸确定的评估。

This document specifies techniques for the manual ultrasonic testing of fusion-welded joints in metallic materials of thickness ≥8 mm which exhibit low ultrasonic attenuation (especially that due to scatter) at object temperatures from 0 °C to 60 °C. It is primarily intended for use on full penetration welded joints where both the welded and parent material are ferritic.Where material-dependent ultrasonic values are specified in this document, they are based on steels having an ultrasonic sound velocity of (5 920 ± 50) m/s for longitudinal waves and (3 255 ± 30) m/s for transverse waves.This document specifies four testing levels, each corresponding to a different probability of detection of imperfections. Guidance on the selection of testing levels A, B, and C is given in Annex A.This document specifies that the requirements of testing level D, which is intended for special applications, be in accordance with general requirements. Testing level D can only be used when defined by specification. This includes tests of metals other than ferritic steel, tests on partial penetration welds, tests with automated equipment, and tests at object temperatures outside the range 0 °C to 60 °C.This document can be used for the assessment of discontinuities, for acceptance purposes, by either of the following techniques:a) evaluation based primarily on length and echo amplitude of the discontinuity;b) evaluation based on characterization and sizing of the discontinuity by probe movement techniques.

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