Structural Steel Fabrication Process Explained
Quick Answer
Structural steel fabrication moves through five main stages: material procurement and inspection, cutting and shaping (using plasma, laser or saw cutting), drilling/punching for connections, welding built-up sections, and surface preparation (shot-blasting) followed by primer/paint application — each stage typically checked against shop drawings before proceeding.
From Raw Material to Cut Members
Fabrication starts with steel plates and sections being verified against material certificates, then cut to precise dimensions using plasma, laser or mechanical saw cutting depending on thickness and required tolerance. Accuracy at this stage directly determines how well members will fit together on-site.
Drilling, Punching and Welding
Bolt holes are drilled or punched at exact positions specified in the shop drawings, and where built-up sections are required (tapered PEB members, for instance), pieces are welded together under controlled shop conditions — generally producing more consistent weld quality than field welding exposed to weather and variable site conditions.
Surface Preparation and Coating
Before painting, fabricated steel typically undergoes shot-blasting to remove mill scale and surface contaminants, creating a properly profiled surface for primer and paint adhesion — a step that significantly affects how well the coating system performs over the structure's life.