Overview
EN ISO 10675-1:2021 - Non‑destructive testing of welds: Acceptance levels for radiographic testing (Part 1: Steel, nickel, titanium and their alloys) defines radiographic acceptance criteria for indications from imperfections in butt welds of steel, nickel, titanium and their alloys. It sets measurable acceptance levels for radiographic indications (porosity, clustered porosity, linear porosity, lack of fusion, cracks, etc.) and assumes radiography has been performed in accordance with ISO 17636‑1 (RT‑F, film) or ISO 17636‑2 (RT‑S radioscopy / RT‑D digital detectors). Where agreed between parties, the same acceptance levels may be applied to other weld types (e.g., fillet welds) or materials.
Key topics and technical requirements
- Scope: Acceptance levels for indications from imperfections detected by radiographic testing of butt welds in specified metallic materials.
- Prerequisite testing: Accessible weld areas shall be visually inspected per ISO 17637 before radiography.
- Radiographic methods: Supports RT‑F (film), RT‑S (radioscopy) and RT‑D (digital) following ISO 17636‑1/‑2 testing classes (class A or B depending on required quality level).
- Acceptance tables: Numerical acceptance levels are provided (see Table 4 & Table 5). Examples from the standard:
- Cracks - not permitted at any acceptance level.
- Porosity (single layer) - area percentage A limits such as A ≤ 2.5 % (Acceptance level 3), A ≤ 1.5 % (level 2), A ≤ 1 % (level 1); maximum pore diameters related to nominal weld thickness (d ≤ 0.4s, max 5 mm, etc.).
- Clustered porosity, linear porosity and lack of fusion - defined limits and measurement procedures; adjacent imperfections closer than the major dimension of the smaller imperfection are treated as a single imperfection.
- Supporting guidance: Annexes provide limitations of radiography, examples for area percentage determination and calculation rules for combined areas of imperfections.
Practical applications and users
This standard is intended for:
- Welding and NDT engineers, inspectors and quality managers setting or verifying radiographic acceptance criteria.
- Fabrication shops and fabricators producing welded assemblies of steel, nickel, titanium and alloys.
- Specification authors and code writers who need harmonized radiographic acceptance levels to reference in contracts, welding standards or application codes.
- Inspection bodies and certification organizations applying objective pass/fail radiographic criteria.
Benefits include consistent, measurable acceptance criteria that tie radiographic indications to welding quality levels and to established radiography techniques (film, radioscopy, digital).
Related standards
Keywords: EN ISO 10675-1:2021, radiographic testing, acceptance levels, non‑destructive testing, RT‑F, RT‑S, RT‑D, weld inspection, porosity limits, butt welds.