Section J2.2/Welded Connections
AISC 360-22 Section J2 covers welded connection design including weld types, sizes, lengths, and strength calculations.
Welding must conform to the Structural Welding Code (AWS D1.1) or the applicable AWS standard. Fillet welds must have a minimum leg size based on the thicker part joined (Table J2.4) and a maximum size limited by the edge thickness of the thinner part. The minimum effective length of a fillet weld must be at least four times the weld size. Complete joint penetration (CJP) groove welds develop the full strength of the connected elements. Partial joint penetration (PJP) groove welds have strength based on the effective throat dimension.
Why this section exists
Welded connections transfer forces through the fusion of base metal and weld metal. The weld size, length, and type must be specified with enough precision for the fabricator and welder to execute correctly and for the inspector to verify. An undersized fillet weld fails in shear along its throat. A CJP groove weld without proper preparation fails to achieve full penetration. These provisions ensure reliable force transfer at every welded joint.
What plan reviewers look for
Plan reviewers check connection details for standard AWS weld symbols that specify weld type, size, length, and any special requirements (field vs. shop, all-around, backing bar). They verify that fillet weld sizes meet the minimums from Table J2.4 and that the weld lengths are adequate for the design forces. They check that the welding procedure specification (WPS) and inspection requirements are in the project specifications.
Common violations
Related AISC 360 requirements
Table J2.4 provides minimum fillet weld sizes. Section J2.4 covers fillet weld design strength. Section J3.1 covers bolted connections as an alternative to welding. AWS D1.1 governs the welding procedures, qualifications, and inspection requirements.