The short answer: the designer nominates the construction category in the project specification, and if none is nominated, CC2 applies. Moving from CC2 to CC3 adds mandatory traceability of welders and weld procedures, higher welder and welding-coordinator qualifications, and a more comprehensive welding quality level (ISO 3834.2 instead of 3834.3). Most of the step is in systems and records, not in weld quality.
What is a construction category?
AS/NZS 5131 is the Australian and New Zealand standard for fabricating and erecting structural steelwork. Rather than applying one set of rules to every job, it scales its requirements to the consequence of failure using four construction categories, from CC1 (lowest) to CC4 (highest).
- CC1: simple, low-consequence work such as gates, handrails, farm sheds and agricultural buildings where people don't gather.
- CC2: most everyday buildings. It is also the default when a specification doesn't name a category.
- CC3: higher-consequence structures, for example higher importance-level buildings and work involving fatigue or earthquake loading.
- CC4: the most critical structures, such as post-disaster facilities.
The category comes from three inputs: the building's importance level (from the NCC or AS/NZS 1170.0), its service category, and its fabrication category. The standard combines these in a table to give the construction category.
Who decides: you or the engineer?
The designer does. The construction category is selected by the engineer and nominated in the construction specification. If the specification doesn't nominate one, the standard says CC2 applies. As the fabricator, your job is to make sure your processes and documentation meet the category on the drawings, and to raise an RFI early if the category isn't clear.
CC2 vs CC3 side by side
| Requirement | CC2 | CC3 |
|---|---|---|
| Recommended welding quality level | AS/NZS ISO 3834.3 (standard) | AS/NZS ISO 3834.2 (comprehensive) |
| Weld categories available | GP and SP | GP, SP and FP |
| Welder qualification | AS/NZS 1554 | AS/NZS 2980 (ISO 9606-1 accepted) |
| Welding coordinator | Required, qualified to AS/NZS 1554 or assessed as competent | Required, qualified to ISO 14731 |
| Welder and weld procedure traceability | Not specified | Required |
| Material traceability | Lot traceability as the baseline | Lot traceability as the baseline, with piece-mark or piece traceability if the specifier selects it |
| Documentation | Defined welding control | Formal welding quality management and more evidence of competence |
The pattern is clear: at CC3 you need to show who welded what, to which procedure, under a coordinator with a recognised qualification, and keep the records to prove it.
Why the step to CC3 costs more than you expect
Most fabricators who do good CC2 work already weld to CC3 quality. The gap is usually paperwork and people:
- re-qualifying welders to AS/NZS 2980 or ISO 9606-1;
- a welding coordinator with ISO 14731 qualification;
- a system that links each weld to the welder and the weld procedure specification (WPS) that was used; and
- a welding quality management system to ISO 3834.2 level.
Closing that gap can take months, so it pays to start well before you tender for CC3 work.
How fabricator certification works
Certification is of the company, not the individual. An independent body assesses your shop against the requirements for a nominated construction category. In Australia this is done through schemes such as Steelwork Compliance Australia (part of the Australian Steel Institute's National Structural Steelwork Compliance Scheme) and the Australian Welding Institute. The process typically looks like this:
- Application, with your management system documents and registers.
- A desktop review of your documents, with gaps reported before any site visit.
- An on-site audit of how your system actually works on the floor.
- Any non-conformances closed out with corrective actions.
- A certification decision, followed by annual surveillance audits and full recertification at the end of each cycle.
Builders and engineers can check a fabricator's certification status, so being certified to the right category is increasingly what gets you on the tender list.
How we help
Our CC2/CC3 welding programme builds your system with you over 8 coaching sessions at a fixed fee, with CompliHub included, so you're ready for your certification audit. Weld Hub in the MGH App keeps your welder register, qualifications, WPS library and weld traceability in one place, so the records CC3 asks for are created as the work happens rather than chased at the end of the job.
This guide is a plain-English summary for fabricators, checked against AS/NZS 5131:2016 incorporating Amendment 1 (2020) and published guidance from the Australian Steel Institute and the Australian Welding Institute. Always work from the standard and your project specification.
Common questions
Who decides the construction category on a job?
The designer (usually the structural engineer) selects the construction category and nominates it in the construction specification. If no category is nominated, AS/NZS 5131 says CC2 applies.
What is the main difference between CC2 and CC3?
CC3 requires traceability of welders and weld procedures, welders qualified to AS/NZS 2980 or ISO 9606-1, a welding coordinator qualified to ISO 14731, and a recommended welding quality level of ISO 3834.2 rather than 3834.3.
Is fabricator certification for a project or for the company?
For the company. A fabricator is certified to a construction category, with annual surveillance audits and recertification at the end of each cycle, rather than certifying each project.