ISO 15626:2018 PDF

Name: ISO 15626:2018 — Non-destructive testing of welds — Time-of-flight diffraction technique (TOFD) — Acceptance levels
SKU: ISO 15626:2018
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Non-destructive testing of welds — Time-of-flight diffraction technique (TOFD) — Acceptance levels

Название (английский):

ISO 15626:2018

Non-destructive testing of welds — Time-of-flight diffraction technique (TOFD) — Acceptance levels

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 20 июля 2018 г.
Издание:: ISO IS 15626 edition 2 version 1
ICS:: 25.160.40

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Описание (английский):

This document specifies acceptance levels for the time‑of‑flight diffraction technique (TOFD) of full penetration welds in ferritic steels from 6 mm up to 300 mm thickness which correspond to the quality levels of ISO 5817. These acceptance levels are applicable to indications classified in accordance with ISO 10863.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 15626:2018 - Non‑destructive testing of welds - Time‑of‑flight diffraction technique (TOFD) - Acceptance levels - defines acceptance criteria for TOFD inspections of full‑penetration welds in ferritic steels of 6 mm to 300 mm thickness. The standard links TOFD acceptance levels to the quality levels of ISO 5817 and requires indications to be classified in accordance with ISO 10863. It specifies how to determine the geometric size of discontinuities (length and height) from TOFD data and sets numerical acceptance limits and total‑length limits for different acceptance levels.

Key topics and technical requirements

Scope & applicability

Applies to TOFD of full‑penetration welds in ferritic steels (6–300 mm).
Acceptance levels correspond to ISO 5817 quality levels (mapping to Acceptance levels 1, 2, 3).

Indication classification

Indications must be classified per ISO 10863 before acceptance evaluation.

Size definitions

Length (l): difference in x‑coordinates of an indication.
Height (h): maximum difference in z‑coordinates at a given x.

Length sizing techniques

Elongated straight indications: fit hyperbolic (arc‑shaped) cursors at ends.
Elongated curved indications: place hyperbolic cursor at ends at 1/3 penetration delay and measure distance between positions.

Height measurement (A‑scan based)

Recommended four methods: transit time between leading edges, first peaks, maximum amplitudes, or first zero crossings (Methods 1–4). Phase reversals must be considered.

Surface‑breaking vs embedded discontinuities

Height determined by comparing lateral wave or back‑wall reflections with tip diffraction signals as appropriate.

Acceptance levels & limits

Three levels with specific maximum acceptable lengths/heights by thickness range.
Total sum of indication lengths over 12·t has level‑dependent limits (e.g., 3.5·t, max 150 mm for Acceptance level 1).

Special cases

For welds joining different thicknesses, acceptance is based on the thinner section.
More stringent criteria or additional NDT recommended for dynamically loaded or crack‑sensitive welds.
If surface‑breaking depth cannot be resolved by TOFD, alternative techniques must be used; otherwise such indications are unacceptable.

Applications and users

Practical use cases:

Weld quality acceptance in fabrication, pressure vessels, pipelines, shipbuilding, power plants, and heavy structural steel.
Routine quality control and acceptance testing where TOFD is used as a primary ultrasonic method.

Typical users:

NDT engineers and technicians, inspection bodies, welding inspectors, QA/QC managers, fabricators, and regulatory authorities.

Benefits:

Provides repeatable, standardized acceptance criteria for TOFD results, improving consistency and defensibility of weld inspections.

Related standards

ISO 5817 - Welding - Quality levels for imperfections (related quality mapping)

ISO 10863 - Examination levels and classification of indications

ISO 5577 - NDT vocabulary (terms used)

Prepared by ISO/TC 44 (Welding and allied processes), SC 5 (Testing and inspection of welds)

Keywords: ISO 15626:2018, TOFD, time‑of‑flight diffraction, non‑destructive testing, weld inspection, acceptance levels, ferritic steels, ISO 5817, ISO 10863.

ISO 15626:2018 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

SIST EN ISO 5817:2023

Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality…

BS EN ISO 10863:2020

Non-destructive testing of welds. Ultrasonic testing. Use of time-of-flight diffraction technique (TOFD).

SIST EN ISO 5577:2026

Non-destructive testing - Ultrasonic testing - Vocabulary (ISO 5577:2025)