Simple Version
The supervison and Inspection of steel structure includes mainly 7 procedures.
First , pre-production check.I will first review the factory's documents including factory certificitions, quality system papers, staff qualifications and other important documents.
Second, check the raw materials and fasteners. I will check the quality certificates of the raw materials and the raw materials themselves.
Third, monitor cutting and assembly of the steel. When they cut , I will check to make sure the length,edges, slopes, bolt holes match the drawing and when they assemble I will make sure
the shape, size and the surface are OK.
Fourth, testing and welding.Before welding, I will check the WPS and after the test I will check the PQR.And I will check the certificate of welders and the material and tools.After the welding job done I will check the quality by VT, UT or RT .
Fifth, surface treatment and painting. After they do the cleaning job I will make sure that the surface reach an Sa 2.5 level and after painting I will check the quality of coating in terms of thickness and other aspects.
Sixth,marking, packaging and shipping.I will check the packing material, package types, packing list, marks , stowage and phytosanitary conditions according to the packing procedure to make sure the cargo shipped to its destination without any damage or problems.
Seventh, final checks.Make sure all the quality and process papers are OK and meet the rules and the packing procedure is followed strictly.
Full Version
1. Pre-production Checks
Before production starts, supervisors first review the factory’s documents. This includes checking quality system papers, staff qualifications (like certificates for testers and welders), and calibration records for tools (such as rulers and hardness machines). They also verify that design drawings are approved and valid. Only when all these are in order can production begin.
2. Checking Raw Materials and Fasteners
Raw materials: Supervisors check two things. First, they look at quality certificates to make sure they have the right stamps from suppliers and the factory, with details like material composition and strength. Second, they inspect the materials themselves—checking for rust, cracks, or wrong sizes, and making sure marks on the materials match the certificates.
Fasteners (like bolts): They check where the fasteners come from, test how well they hold (slip resistance), and ensure their surface treatment and quality papers are good.
3. Monitoring Cutting and Assembly
Cutting: When the factory cuts steel (like H-beams or columns), supervisors check if the lengths are correct. They also look at the edges (slopes) and bolt holes to make sure they match the drawings.
Assembly: When parts are put together, supervisors check the weld shapes and edge sizes. They make sure no parts are bent, rusted, or scratched. Sharp edges are rounded, and exposed metal is treated to prevent rust.
4. Testing and Welding
Welding: Before welding, supervisors check the factory’s welding plans.The main documentations used in this process are WPS and PQR. They watch to make sure welders are qualified, and that materials (like rods) are stored and used properly. They also check welding settings (like current and voltage) to ensure they’re correct. After welding, they look for flaws like cracks or holes on the weld surface.
Non-destructive testing (NDT): Important welds (Class I) are fully tested using ultrasound or X-rays. Less critical ones (Class II) are checked 20%. This finds hidden flaws inside welds.
5. Surface Treatment and Painting
Rust removal: The steel is cleaned by shot blasting to reach a near-white finish (Sa 2.5 level). Hard-to-reach areas (like around stiffeners) are cleaned by hand, with the same standard. In this process, a Surface Roughness Tester will be used. I will witness and moniter this testing process and record.
Painting: Supervisors check the paint layers (primer, middle coat, sometimes top coat). They use a tool to measure paint thickness, making sure it’s thick enough. They also check for problems like cracks or peeling, and test if the paint sticks well (adhesion ≥5MPa). megapascal
6. Marking, Packaging, and Shipping
Marking: Each part must have clear labels (stamps, codes, or QR codes) that match the drawings, so they’re not mixed up during installation.
Packaging/shipping: Supervisors check that parts are packed safely—tied down tight, with pads to stop damage. Small parts (like bolts) are kept dry. The package must fit transport rules.
7. Final Checks
At the end, supervisors do a full check: looking at the overall shape, sizes, and how parts are loaded. They also review all quality papers (like material certificates and test reports) to make sure everything meets the rules. Only then is the steel structure approved for delivery.
