ISO 2553 Welding and allied processes – Symbolic representation on drawings – Welded joints

Defines the weld symbols on drawings: reference line, arrow, symbol for the weld type, dimensions (a or z), length, all-round and site-weld marks.

CodeISO 2553Issued byISOFieldDrawings

What it covers

Elementary and supplementary symbols, dimensioning of welds, complementary indications.
Two systems: system A (ISO practice with a dashed identification line) and system B (based on AWS practice).

Key points for fabricators

Check whether a fillet size is given as throat a or leg z before calculating weld metal.

How PEB Studio supports it

The weld register keeps weld type, joint type and size separately, so values read from the drawing symbols are entered once and reused for consumable calculations.

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

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Atualizado em 01 Nov 2026

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