An upper hollow structural section column with wall thickness T1 aligns axially above a lower hollow structural section column with wall thickness T2 along a common column centerline. A transition plate is interposed between the column ends, featuring a gap dimensioned as the larger of T1, T2, or X, with mill tolerances noted on each side. The connection is detailed with a 5/16-inch fillet weld or complete joint penetration weld around the perimeter, indicated as 1/2-inch typical on four sides.
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