§ Standards
Status
CURRENT
Last verified
2026-09-06
CEN · STANDARD
EN
ISO 5817
Quality levels for imperfections in fusion-welded joints in steel
Overview
What this standard covers
Weld acceptance quality levels B, C and D, referenced directly by EN 1090-2 for each execution class.
Weld acceptance quality levels B, C and D, referenced directly by EN 1090-2 for each execution class.
Who uses it
Welding coordinators, welders and inspectors qualifying procedures and demonstrating weld quality.
Details
Reference data
- Standard number
- EN ISO 5817
- Title
- Quality levels for imperfections in fusion-welded joints in steel
- Organisation
- CEN
- Country
- European Union
- Region
- European Union
- Subject
- Welding
- Subcategory
- Acceptance
- Type
- STANDARD
- Application
- Contractual
- Availability
- Paid
- Status
- CURRENT
- Roles
- welding standard
- Last verified
- 2026-09-06
Official source: standards.cencenelec.eu
Related
Standards used alongside this one
- EN 1090-2
Execution of steel structures — Technical requirements
The harmonised execution standard applied across the EU, defining execution classes and the fabrication, welding, bolting and erection requirements attached to each.
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Solid wire classification for MIG/MAG welding, including ER70S-6.
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- AWS A5.20
Specification for Carbon Steel Electrodes for Flux Cored Arc Welding
Flux cored wire classification widely used for structural shop and site welding.
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- AWS D1.1
Structural Welding Code — Steel
The US structural welding code: prequalified joints, welding procedure and welder qualification, workmanship, and visual and NDT acceptance criteria for statically and cyclically loaded work.
United StatesWeldingCURRENTPaid
- AWS D1.5
Bridge Welding Code
Welding requirements for highway bridge steelwork, with tighter fracture control provisions than D1.1.
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Sourcing, review and use
Status
Editorial reference information compiled and maintained by the StructuralSteel.ai team. It is not a design certificate and is not issued under an engineer's seal.
Last reviewed
Calculations
Any figures produced on this page are indicative estimates for early sizing and comparison only — they are not engineered design outputs.
References
Final member selection, loading, connection design, fire design, fabrication and compliance must be verified for your specific project by a suitably qualified structural engineer. Standards are revised; check the edition in force where the work is built.
Verification
StructuralSteel.ai provides technical reference information and links to authoritative sources. Project specifications, applicable legislation, current standards editions and requirements of the responsible engineer or authority should always be verified before fabrication or supply.