In the railway sector — wagons, bogies, locomotive bodies, rail infrastructure — weld quality is governed by the EN 15085 series of standards. This series is the railway-specific adaptation of ISO 3834-2 and has been mandatory across all EU member states since 2008.
The Five Parts of EN 15085
| Part | Scope |
|---|---|
| EN 15085-1 | General scope and structure of the standard |
| EN 15085-2 | Manufacturer certification requirements (CL1–CL4) |
| EN 15085-3 | Design requirements (performance classes CP A, B, C, D) |
| EN 15085-4 | Manufacturing requirements |
| EN 15085-5 | Inspection and testing |
Manufacturer Certification Levels (CL)
| Level | Scope | Example Components |
|---|---|---|
| CL1 | All safety categories (CP A, B, C, D) | Bogie, axle, brake, drawbar |
| CL2 | CP B, C, D | Wagon body structure, door frame |
| CL3 | CP C, D | Interior furniture, handrail, light bracket |
| CL4 | CP D only | Visual/decorative components |
Performance Classes (CP)
- CP A: Highly safety-critical, dynamically loaded, risk of fatal injury
- CP B: Medium-high criticality, dynamically loaded
- CP C: Medium criticality, static or low dynamic load
- CP D: Low safety criticality, decorative or support
EN 15085-2 Certification Process
- Apply to a recognised inspection body (TÜV SÜD, DB Systemtechnik, Lloyd's, Bureau Veritas)
- Initial audit: ISO 3834-2 + ISO 9001 + EN 15085 specific requirements
- Approved WPS library covering railway-specific materials
- Certified welders: EN ISO 9606 + EN 15085 supplementary module
- European Coordinator (ECWS): IWE/IWT level engineer
- Certificate validity: 3 years, interim audits every 12 months
Railway-Specific Materials
| Material | Typical Use | Property |
|---|---|---|
| S355J2W | Wagon outer skin | Atmospheric corrosion resistant |
| S700MC | Bogie frame, load-bearing beam | High strength-to-weight ratio |
| S690QL | Drawbar, axle bearing | Fatigue resistance |
| EN AW-5083 | Aluminium body (high-speed) | Corrosion + machinability |
| EN AW-6082 | Aluminium bogie frame | Post-heat-treatment strength |
Acceptance Criteria and NDT Rates
- CP A + S3: EN ISO 5817 Level B
- CP B + S2: EN ISO 5817 Level C
- CP C + S1: EN ISO 5817 Level D
| CP / Load | VT | UT/RT |
|---|---|---|
| CP A + S3 | 100% | 100% |
| CP B + S2 | 100% | 10–100% |
| CP C + S1 | 100% | — |
| CP D | 100% | — |
European Coordinator (ECWS)
Every certified manufacturer must employ a European Welding Coordinator (ECWS) at IWE level. Responsibilities: WPS preparation, welder exams, production records, NDT reports, annual internal audit.
Practical reality: EN 15085 certification is a prerequisite for entering railway projects. TCDD, Eurostar, DB, SNCF and all major operators require CL1 or CL2 certification in tender specifications.
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