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A C-51 Structural Steel license is required to fabricate and erect a building’s load-bearing steel frame — columns, beams, and their welded, riveted, or bolted connections — under 16 CCR §832.51. Read the complete C-51 exam guide for requirements and exam structure.
CSLB’s published C-51 exam content outline divides the test into five weighted sections, and welding inspection and certification standards (AWS D1.1) show up directly in that outline because structural steel connections themselves are typically welded, riveted, or bolted. Prep providers commonly cite roughly 115 questions across 3.5 hours as typical for CSLB trade exams generally.