What Traceability Really Means in ISO 3834 and EN 1090
Traceability links each weld to its procedure (WPS), qualification records (PQR/WPQR), materials and consumables, operator identity, and acceptance result. ISO 3834 defines the quality requirements framework for fusion welding; EN 1090 mandates factory production control (FPC) for structural steel/aluminium, including welding coordination and documented inspection/test plans.
Thermography adds objective evidence at production time: process stability metrics (e.g., cooling rate windows, HAZ width, toe cooldown), time‑stamped frames, and alarm logs mapped to joint IDs. These support internal release decisions and external audits when paired with established acceptance methods.
Mapping Thermographic Data to WPS/PQR and Welder Qualifications
Associate frames and metrics with essential variables (current, voltage, travel speed, preheat/interpass) and with PQR/WPQR identifiers and welder qualifications. Record materials and consumables batch IDs. Capture part genealogy, station ID, and revision so investigations can follow a single joint through manufacture and inspection.
Use structured identifiers (e.g., GS1‑like) for joints and segments and embed them in file names and JSON records so exported data remains linkable outside your system.
Record Retention, Time Stamps, and Tamper‑Evidence
Synchronize clocks (PTP/NTP) and store timestamps in ISO 8601 (UTC). Generate SHA‑256 hashes per record and store them with a signature or in a WORM/append‑only store to provide tamper evidence. Maintain retention per contract and standard; keep hash manifests and audit trails separate from the primary datastore.
For change control, use versioned procedures and log who/when thresholds and acceptance logic changed. Provide auditors with a read‑only export that includes data, metadata, and signatures.
Audit Workflows: From Thermal Frames to Acceptance Status
flowchart LR Sensor[“thermal sensor”] —> Store[“signed record store”] Store —> Rules[“acceptance rules”] Rules —> Status[“accept / review / reject”] Store —> Export[“export to audit”]
Integrating With MES/ERP and QMS (API Hooks and Exports)
Provide REST/CSV exports for part genealogy, NCR workflows, and KPIs. Use webhooks to push acceptance status and alarms to downstream systems and mobile apps. Align data fields with your ITPs and weld maps so evidence is immediately consumable by QA and production teams.
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Cybersecurity and Data Governance for Weld Records
Harden devices, segment networks, and enforce least privilege. Inventory all endpoints (cameras, edge computers) and maintain patch levels. Apply role‑based access, MFA for admins, and encrypt data at rest and in transit. Monitor access, retention policy conformance, and integrity checks to support audits and incident response.
Related: thermography fundamentals
Related Articles
- PPAP for Welded Components: Control Plan & FMEA Samples — Complete PPAP documentation guide for weld quality
- ISO 3834 & EN 1090 Audit Checklist for Welding Manufacturers — Pre-audit checklist and preparation guide
- Digital Welding Quality Records: WPS, PQR & Traceability — Digital documentation and QMS integration
- QMS Software for ISO 3834, EN 1090 & ASME — Software solutions for standards compliance
References
- ISO 3834 — Quality requirements for fusion welding of metallic materials
- EN 1090 — Execution of steel structures and aluminium structures (FPC)
- ISO 17635 — NDT of welds — General rules
- EN 17637 — Visual testing of fusion‑welded joints
Consult official standards for definitive wording and classes; this article provides implementation guidance, not a substitute for code requirements.
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