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What ISO 3834 is
ISO 3834 defines quality requirements for fusion welding of metallic materials. It treats welding as a special process – the quality of a weld cannot be fully verified afterwards, so it has to be built in by controlling people, procedures, equipment, materials and inspection. The series has three levels: Part 2 comprehensive, Part 3 standard and Part 4 elementary. Part 2 is the highest level and is suitable for welded steel structures from the simplest to the most complex.
World Steel's welding quality management system has been assessed by Bureau Veritas Vietnam and found to be in accordance with EN ISO 3834-2:2021 for the manufacturing, supplying and installation of steel structure products and pre-engineered steel buildings (certificate INY-CER/23/1056 Rev.0, initial certification 27 October 2023, subject to annual re-evaluation).
What ISO 3834-2 requires
| Element | How World Steel applies it |
|---|---|
| Review of requirements and technical review | Contract, codes, weld categories and inspection levels reviewed before fabrication |
| Welding personnel | Welders qualified to EN ISO 9606-1, AWS D1.1 or AS/NZS 1554.1; welding coordination to EN ISO 14731 |
| Inspection and testing personnel | Visual inspectors and NDT operators qualified for the methods used |
| Welding procedures | WPS supported by qualified procedures (EN ISO 15614-1 / AWS D1.1 / AS/NZS 1554.1) |
| Equipment | Maintained and validated welding equipment, calibrated measuring devices |
| Welding consumables | Batch control, storage and handling to manufacturer requirements |
| Inspection before, during and after welding | Fit-up, parameters, visual and NDT inspection recorded |
| Non-conformity and corrective action | Repairs to approved procedures and re-inspection |
| Identification, traceability and records | Heat numbers, welder IDs and inspection records kept per piece |
Why it matters for every market
EN ISO 3834-2 is the welding quality level required by EN 1090-2 for EXC3 and EXC4, so it underpins World Steel's CE marking in Europe. In Australia and New Zealand it complements AS/NZS 5131 CC3, and for US projects it sits alongside AWS D1.1 and the IAS AC472 programme. For any client it is independent evidence that every weld – from built-up frames to stairs, handrails and embed plates – is produced under a controlled, audited system.
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