GB/T 44362-2024 Non-destructive testing of welds—Ultrasonic testing—Automated total focusing technique(TFM)

Scope

This document specifies the use of fully focused ultrasonic testing (TFM) and related technologies for semi-automatic or fully automatic ultrasonic testing of metal fusion welded joints with a base metal thickness of not less than 3.2 mm.
Note: Unless otherwise specified, the terms "TFM" and "TFM technology" in this document refer to the TFM technology defined in ISO 23243 and all related technologies, as detailed in GB/T 43921-2024 and ISO 23243.
This document applies to isotropic (identical performance in different directions) and uniform metal welds, as well as isotropic and uniform low-carbon alloy steel welds and conventional aviation-grade aluminum and titanium alloy welds.
This document applies to fully penetrated welded joints with simple geometries of plates, pipes, and containers.
This document specifies four inspection levels (Level A, Level B, Level C, and Level D), each corresponding to different defect detection rates, and provides guidelines for selecting inspection levels. When meeting the requirements of this document, it can detect coarse-grained metals and austenitic welds.
This document specifies the specific capabilities and limitations of TFM technology in the detection, localization, quantification, and characterization of discontinuities in fusion welded joints. TFM technology can be used as a standalone technique or in combination with other non-destructive testing (NDT) methods for manufacturing, in-service, and post-repair inspections.
This document includes evaluation of acceptance criteria based on length and maximum echo amplitude (equivalent reflector size) or length and height.
This document does not include acceptance criteria for discontinuities.
This document describes the following two typical detection techniques for fusion welded joints:
a) Lateral scanning, where the probe is placed near the weld cover and scans from one or both sides of the weld using a we

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