Quality management, quality plans and supervision under AS/NZS 5131

Why quality management sits at the centre of AS/NZS 5131

AS/NZS 5131 does not simply list fabrication rules – it requires that the operations in each major section (materials, fabrication, welding and so on) are run under a suitable quality management system. Clauses 5.1.2, 6.1.2 and 7.1.1.2 each point to AS/NZS ISO 9001 as an example, and each note that the depth of documentation generally increases from CC1 to CC4. The informative Appendix D then shows what that scaling looks like in practice, and Appendix E describes what a project-specific quality plan should contain.

For an assessor, the practical question is therefore not "does the fabricator have a quality manual?" but "does the system deliver the evidence the specified construction category calls for?" Third-party product certification such as World Steel's AS/NZS 5131 CC3 certificate shows the system has been audited, but each project still needs its own plan and records. The construction category itself is set by the designer (see construction categories CC1–CC4), and the construction specification governs where it adds to or varies the Standard.

Appendix D – QMS elements scaled by construction category

Appendix D adapts the ISO 3834 approach to three essential processes: fabrication (Table D1), corrosion protection (Table D2, graded by coating quality level PC1/PC2 rather than CC) and erection (Table D3). The common thread is that welding discipline – documented procedures, qualified people, controlled equipment, inspection and records – is applied to every process that affects the finished structure. The summary below is our own high-level reading of the fabrication elements; refer to the current edition of AS/NZS 5131 for the full requirements.

Two points apply at every category: sub-contracted work must be controlled as if the fabricator made it, with final responsibility for quality staying with the fabricator, and quality records are always required. That matters when galvanizing, NDE or painting are carried out by others – the main fabricator still owns the outcome.

Appendix E – what a project quality plan should cover

Where a quality plan is required by Clause 4.5.2 or the construction specification, Appendix E gives informative guidance on its content. In summary, a good plan:

• Management – describes the structure, an organisation chart with named key personnel and lines of communication, coordination with other parties, delegated sub-contract functions, proof of competence of welding supervisors, inspectors and welders, and control of variations and concessions (E2.1).
• Specification review – captures unusual project requirements that go beyond the standing QMS (E2.2).
• Document control – manages revision status so superseded drawings are not used in-house or by sub-contractors, and describes how shop and erection drawings are detailed, checked and reconciled with RFIs and change documents (E2.3.1, E2.3.101).
• Pre-execution documents – material and consumable certificates, WPS and qualification records, method statements and agreed approval points (E2.3.2).
• Construction records – traceability of materials to components, inspection and test reports, NCR actions, calibration records and survey results (E2.3.3).
• Retention – records available for inspection and kept for a minimum of five years unless others require longer (E2.3.4).

ITPs, hold points and witness points

Clause 13.1 is unambiguous: inspection and testing at each stage must follow a documented inspection and test plan using documented procedures, and where a quality plan is required the ITPs form part of it. The ITP must include at least the checks in Clauses 13.3–13.12, plus any extra requirements and any Appendix B options selected in the construction specification. Clause 13.2 extends inspection across procurement, fabrication, surface preparation, painting, galvanizing and erection.

Appendix E2.4 adds the project layer: the plan should identify which tests are to be witnessed and by whom, and where hold points apply. In common Australian practice a hold point stops work until the nominated party has inspected or released it, while a witness point gives that party notice and the opportunity to attend without halting production. Typical CC3 hold points include WPS approval before production welding, fit-up of complete-penetration joints before welding, NDE release before blasting, and surface preparation before the first coat.

For an offshore fabricator, hold points need an agreed notice period and a practical release method. Remote witnessing by live video, followed by signed records, is increasingly accepted – but only where the client or certifier agrees it in advance.

Supervision and competence requirements

Several clauses require named, competent supervision once a project is CC2 or above. Our summary:

Welding is where CC3 steps up most clearly. Clause 7.1.1 recommends AS/NZS ISO 3834.2 (comprehensive quality requirements) for CC3 and CC4, and Table 7.4 calls for welders qualified to AS/NZS 2980, welding coordinators meeting ISO 14731, and traceability of both welders and weld procedures. Clause 7.2 recommends a welding plan for complex fabrications, masked welds, lamellar-tearing risk or modifications, covering WPS, distortion control, weld sequence, weld categories, ITP cross-references and weld identification. See the welding chapter for detail.

Nonconformance control and records

At CC2 and above, Appendix D expects not just control of nonconforming product but documented repair and rectification procedures. Clause 13.1 requires every result, resulting action and correction to be recorded. An assessor will usually sample an NCR register and trace a few entries end to end: detection, quarantine, disposition (rework, repair, use-as-is by concession), engineer approval where needed, re-inspection and close-out.

For export projects, records must be in English, legible, linked to piece marks and drawing revisions, and assembled into a handover dossier the certifier can audit. Missing or unsigned records are themselves a nonconformance, regardless of the physical quality of the steel. The inspection and testing chapter covers the stage-by-stage checks.