ISO 5817 Welding – Fusion-welded joints in steel – Quality levels for imperfections

Defines three quality levels – B (stringent), C (intermediate) and D (moderate) – with limits for each type of weld imperfection such as cracks, porosity, undercut and misalignment.

CodeISO 5817Issued byISOFieldWeld acceptance

What it covers

Limits for surface and internal imperfections of arc-welded joints in steel.
Applies to butt and fillet welds over a range of thicknesses.

Key points for fabricators

EN 1090-2 links the required quality level to the execution class (typically C for EXC2 and B for EXC3, with additional requirements).
Inspectors record the imperfection type and the level it was judged against.

How PEB Studio supports it

Inspection steps can name ISO 5817 as the acceptance standard; a FAIL records the defect (porosity, undercut, dimensional deviation…) and its disposition, and re-inspections are kept as #2, #3…

This page is a summary for orientation. Always work from the edition of the standard named in the project specification.

Voir aussi

Où PEB Studio l’applique

FonctionnalitésF.8 QA/QC workflow, inspection queue & workshop NCR

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Mis à jour le 01 Nov 2026

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