Structural steel welding guide covering AWS D1.1 code requirements, moment connections, column splices, field erection welding, and welder qualification. Processes, joint details, and inspection standards.
Structural steel welding is code-governed work. Every joint, every weld size, and every welding procedure is specified by engineers and governed by AWS D1.1. There’s no room for field improvisation on moment connections or column splices. If it’s not in the WPS, you don’t weld it.
AWS D1.1 is the structural welding code that controls most building and bridge fabrication in the U.S. It specifies prequalified joint details, welder qualification requirements, welding procedure specifications (WPS), fabrication tolerances, and inspection criteria. Welders must pass qualification tests on the specific joint configurations and positions they’ll perform on the project.
Prequalified joints are joint designs that D1.1 has already validated. Using a prequalified joint detail with qualified parameters means you don’t need separate procedure qualification testing. This saves time and cost, which is why most structural connections use prequalified details straight from the code.
Shop fabrication is where beams, columns, and connections are welded in a controlled environment. Flange-to-web welds on plate girders often use submerged arc welding (SAW) for speed. Stiffener plates, shear tabs, and moment connection components get welded with FCAW-G. Shop welding benefits from flat and horizontal positioning, proper fixturing, and climate control.
Field erection brings everything together on the jobsite. Self-shielded flux-core (FCAW-S) dominates field work because wind doesn’t disrupt the process. Complete joint penetration (CJP) welds on moment connections require backing bars, run-off tabs, and often ultrasonic testing (UT) after completion. Column splices, base plates, and brace connections all follow the approved WPS exactly.
Seismic applications add AWS D1.8 requirements for demand-critical welds in seismic force-resisting systems. These welds need Charpy V-notch tested filler metals, tighter acceptance criteria, and additional NDT. Post-Northridge connection details changed how moment frames are welded in seismic zones.
For welding career information and certification, see our welding career section. Back to welding applications for more industry guides.
How to weld beam splices per AWS D1.1. Covers CJP flange welds, web connection options, backing bars, access holes, weld sequence for distortion control, and inspection.
Structural welding procedures per AWS D1.1. Covers prequalified WPSs, CJP and PJP groove welds, fillet weld sizing, visual inspection, and welder qualification requirements.
Moment connection welding for seismic steel frames. Covers demand-critical welds, notch-tough filler metal, backing bar removal, weld access holes per AISC 358, and AWS D1.8.