ISO 15626-2018 PDF
Name in English:
St ISO 15626-2018
Name in Russian:
Ст ISO 15626-2018
Original standard ISO 15626-2018 in PDF full version. Additional info + preview on request
Full title and description
ISO 15626:2018 — Non-destructive testing of welds — Time‑of‑flight diffraction technique (TOFD) — Acceptance levels. This international standard specifies acceptance levels and related guidance for using the TOFD method on full‑penetration welded joints in ferritic steels.
Abstract
This document specifies acceptance levels for the time‑of‑flight diffraction (TOFD) technique applied to full‑penetration welds in ferritic steels with thicknesses from 6 mm up to 300 mm. The acceptance levels are intended to correspond to the quality levels defined in ISO 5817 and are applicable to indications classified in accordance with ISO 10863.
General information
- Status: Published (current; confirmed at last ISO review).
- Publication date: July 2018 (Edition 2).
- Publisher: International Organization for Standardization (ISO).
- ICS / categories: 25.160.40 (Non‑destructive testing of welds / TOFD).
- Edition / version: Edition 2 (2018).
- Number of pages: 11 pages.
Scope
ISO 15626:2018 defines acceptance levels for the TOFD technique when inspecting full‑penetration welds made in ferritic steels of nominal thickness between 6 mm and 300 mm. The acceptance criteria are given so they align with ISO 5817 quality levels; the provisions apply to indications that have been classified according to ISO 10863. The standard is focused on TOFD as a complementary or primary NDT method for sizing and acceptance decisions rather than detailed procedure development for all TOFD equipment configurations.
Key topics and requirements
- Definition of acceptance levels for TOFD indications corresponding to ISO 5817 weld quality classes.
- Applicable material range: ferritic steels; thickness range 6 mm to 300 mm.
- Relationship and application guidance referencing ISO 10863 for indication classification.
- Requirements for reporting of TOFD findings sufficient for acceptance decisions (sizing, classification, and relevant test parameters).
- Notes on limitations and intended use of TOFD as an inspection technique within a broader NDT programme.
Typical use and users
Used by nondestructive testing (NDT) practitioners, welding inspectors, quality assurance and quality control engineers, fabrication and manufacturing organizations, code authorities, and third‑party inspection bodies in industries such as pressure vessels, pipelines, power generation, petrochemical, and heavy fabrication where TOFD is applied for weld acceptance and defect evaluation.
Related standards
Key related documents include ISO 5817 (weld quality levels) and ISO 10863 (classification of indications). ISO 15626:2018 replaces ISO 15626:2011 and a further revision (ISO/CD 15626) has been registered as a committee draft to update the standard in a future edition.
Keywords
TOFD; time‑of‑flight diffraction; non‑destructive testing; NDT; weld acceptance; acceptance levels; ferritic steels; ISO 5817; ISO 10863; weld inspection.
FAQ
Q: What is this standard?
A: ISO 15626:2018 is an international standard that specifies acceptance levels for the time‑of‑flight diffraction (TOFD) technique when inspecting full‑penetration welds in ferritic steels.
Q: What does it cover?
A: It covers acceptance criteria and related guidance for TOFD indications on ferritic steel welds 6 mm to 300 mm thick, aligned to ISO 5817 quality levels and using indication classification per ISO 10863.
Q: Who typically uses it?
A: NDT technicians and managers, welding inspectors, fabrication QA/QC teams, certifying bodies, and engineers responsible for weld integrity and acceptance decisions.
Q: Is it current or superseded?
A: Edition 2 (2018) is the current published version and was confirmed at ISO review; a revision project (committee draft ISO/CD 15626) is in progress, so a new edition may be published in the future.
Q: Is it part of a series?
A: It is a single‑topic ISO standard that interacts with other standards on welded joint acceptance and NDT (notably ISO 5817 and ISO 10863) rather than being one numbered part of a multi‑part series.
Q: What are the key keywords?
A: TOFD, time‑of‑flight diffraction, non‑destructive testing, weld acceptance, ferritic steels, ISO 5817, ISO 10863.