Structural · S-KKD5E

Weld Access Hole Detail

Materials

weld

Elements

Columns Beams Connections / Plates Reinforcing

Connections

Welded Connection

About this detail

This structural steel detail shows the geometry and welding requirements for a beam weld access hole, also known as a rathole, at a moment connection to a column flange or web. The assembly consists of a structural steel column flange intersecting a beam top flange and bottom flange, joined by complete joint penetration groove welds at the beam web and flanges. The weld access hole features specified geometric proportions relative to the beam flange thickness, including a minimum radius and length dimensions for the cut. Back-up bars are removed, surfaces ground smooth, and reinforced with a minimum one-quarter-inch or five-sixteenths-inch fillet weld overlapping the beam flange cut as required.

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