Project Delivery
Quality Control and Inspection in PEB Manufacturing
Quality control and inspection in pre-engineered buildings is the planned system of checks on materials, cutting, welding, dimensions, coatings, packing and site assembly that confirms each component meets the approved drawings, the project specification and the governing fabrication and welding codes.
Key facts
- Quality starts with incoming material checks and traceability.
- Welding inspection includes visual examination and, where specified, nondestructive testing.
- Dimensional checks focus on hole positions, end plate flatness and member length.
- Coating thickness and adhesion are checked against the specification.
- Third-party inspection can be arranged by the owner when the project requires it.
Planning quality before fabrication
An inspection and test plan lists the checks to be made, the acceptance criteria, the frequency and who performs or witnesses each check. For many projects the governing fabrication standard, such as EN 1090, AS/NZS 5131 or the AISC specification, sets the framework, and the project specification adds any extra requirements.
Agreeing the plan early lets the owner or their inspector decide which points they want to witness, rather than discovering later that a step has already passed.
Material receipt and traceability
Plates, coil and bolts are checked on receipt against purchase requirements and mill documentation. Grade, thickness and coating are verified, and material is identified so it can be traced through production where the project requires it.
For cold-formed sections and sheeting, coil coating mass and paint system are checked against the specification. Fasteners are checked for grade, coating and packaging.
Welding and dimensional inspection
All welds are visually inspected for size, profile and surface defects. Where the specification or code requires, nondestructive testing such as ultrasonic, magnetic particle or dye penetrant testing is used on selected welds, especially full penetration welds and crane-related members.
Dimensional checks verify length, depth, hole positions, end plate flatness, camber and sweep. Bolted end plate connections depend on accurate geometry, so these checks are among the most important in PEB fabrication.
Coating and packing checks
Surface preparation is checked before coating, and dry film thickness is measured on finished members. Adhesion and appearance are checked as specified. Galvanized items are checked for coating thickness and continuity.
Before dispatch, bundles are checked against packing lists, labels and the erection sequence. Protection for sheet bundles and painted surfaces is confirmed to reduce transport damage.
Site inspection and documentation
On site, checks cover anchor bolt position and level, frame plumbness and alignment, bolt installation and tightening, bracing tension, and envelope fixing and sealing. Bolt installation follows the specification, for example the RCSC Specification or the relevant regional code.
The resulting records, including material documentation, inspection reports and nonconformance closeouts, form part of the quality dossier handed to the owner when specified in the contract.
Quality points to agree with your supplier
- Governing fabrication and welding standards.
- Inspection and test plan with witness points.
- Scope and acceptance criteria for nondestructive testing.
- Coating inspection method and frequency.
- Bolt tightening method and site inspection responsibility.
- Content of the quality documentation package.
Frequently Asked Questions
Can I send my own inspector to the factory?
Owners can usually arrange witness inspection or third-party inspection at agreed points. The scope, access and schedule should be agreed in the contract and inspection and test plan.
Is nondestructive testing required on all welds?
No. Visual inspection applies to all welds, while nondestructive testing is applied to welds and frequencies defined by the governing code and project specification.
Who inspects the building on site?
The erector performs its own checks, and the owner, engineer of record or authority having jurisdiction may also inspect. Responsibilities are defined in the contract and local regulations.
Engineering content is general guidance. Every World Steel building is designed by qualified engineers to the code and loads of the project.
