ISO 20601:2018 焊接的无损检验 超声波检验 薄壁钢构件用自动相控阵技术

标准编号：ISO 20601:2018

中文名称：焊接的无损检验 超声波检验 薄壁钢构件用自动相控阵技术

英文名称：Non-destructive testing of welds — Ultrasonic testing — Use of automated phased array technology for thin-walled steel components

发布日期：2018-12

标准范围

This document specifies the application of phased array technology for the semi- or fully automated 
ultrasonic testing of fusion-welded joints in steel parts with thickness values between 3,2 mm and 
8,0 mm. This meets the typical range of tube wall thickness values in boilers, which is an important 
application of this testing technology. The minimum and maximum value of the wall thickness range 
can be exceeded, when testing level “D” of this document is applied. This document applies to full 
penetration welded joints of simple geometry in plates, tubes, pipes, and vessels, where both the weld 
and parent material are low-alloy and/or fine grained steel.
NOTE “Semi-automated testing” encompasses a controlled movement of one or more probes on the surface of 
a component along a fixture (guidance strip, ruler, etc.), whereby the probe position is unambiguously measured 
with a position sensor. The probe is moved manually. “Fully automated testing” includes mechanized propulsion 
in addition.
Where material-dependent ultrasonic parameters are specified in this document, they are based on 
steels having a sound velocity of (5 920 ± 50) m/s for longitudinal waves, and (3 255 ± 30) m/s for 
transverse waves. It is necessary to take this fact into account when testing materials with a different 
velocity.
This document provides guidance on the specific capabilities and limitations of phased array 
technology for the detection, location, sizing and characterization of discontinuities in fusion-welded 
joints. Ultrasonic phased array technology can be used as a stand-alone technique or in combination 
with other non-destructive testing (NDT) methods or techniques, during manufacturing and testing of 
new welds/repair welds (pre-service testing).
This document specifies two testing levels:
— level “C” for standard situations;
— level “D” for different situations/special applications.
This document describes assessment of discontinuities for acceptance purposes based on:
— height and length;
— amplitude (equivalent reflector size) and length;
— go/no-go decision.
This document does not include acceptance levels for discontinuities.

标准预览图