Structural Welding: Standards and Qualifications
Published on 14 August 2026 by Metal S.r.l.
Structural welding is regulated by EN 1090.
Execution classes (EXC)
| Class | Structure type | Requirements |
|---|---|---|
| EXC1 | Sheds, fences | Qualified welders, simple WPS |
| EXC2 | Mezzanines, stairs, frames | ISO 9606 welders, WPS/PQR |
| EXC3 | Bridges, cranes | Certified welders, extended NDT |
| EXC4 | Dams, towers | Maximum control |
Welder qualifications
Per ISO 9606-1: process, position, base material, thickness.
NDT methods
| Method | Detects |
|---|---|
| Radiography (RT) | Porosity, inclusions |
| Ultrasonic (UT) | Internal cracks |
| Magnetic particle (MT) | Surface cracks |
| Dye penetrant (PT) | Surface discontinuities |
| Visual (VT) | Macroscopic defects |
Metal S.r.l. provides CE declaration, welder certificates, WPS/PQR and NDT reports.
Conclusion
If you need support for your project, the Metal S.r.l. team is available for technical analysis, quotations and samples.
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