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 epair 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 o-go decision. This document does not include acceptance levels for discontinuities.
EN ISO 20601:2018 history
2018EN ISO 20601:2018 Non-destructive testing of welds - Ultrasonic testing - Use of automated phased array technology for thin-walled steel components