Structural · S-RZCYV

Typical Weld Access Hole

Materials

Connections

About this detail

A structural steel beam weld access hole, commonly known as a rat hole, provides clearance for full-penetration groove welds at beam-to-column flange connections. The geometry requires a minimum three-eighths-inch radius at the base of the cut, with dimensions proportioned to the flange thickness. The horizontal length of the cut extends to three times the flange thickness with a plus-or-minus-one-half-inch tolerance, while the vertical height ranges from three-quarters of the flange thickness to the full flange thickness, maintaining a three-quarter-inch minimum with a plus-or-minus-one-quarter-inch tolerance. The flange edge features a bevel determined by AWS D1.1 standards for the selected groove weld procedure. Fabrication details, including approved cutting methods and smoothness requirements, must conform to project specifications.

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