Welded outer bumps, hems, column plates and beams, separating sections must have cut angles. The cut openings should be near the edges everywhere, and the corners with radii are preferable in order to ease the continuity of the welds. Round holes are less effective, and if they are used, they should be preferably near the corners. It is advisable to consult the galvanicians about the appropriate drainage openings and their dimensions.
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