HOLLOW STRUCTURAL SECTIONS

HOLLOW STRUCTURAL SECTIONSOF NORTH AMERICAC olumn Load Tables2 Electric Resistance Welding (ERW) ProcessIn the tube mill, flat steel strip (1) is formed continuously around itslongitudinal axis to produce a round tube. This is done by moving thestrip through a progressive set of rolls (2-6). The strip edges (7) areheated by either high frequency induction or contact welding and thenforged together by weld rolls to create a continuous longitudinal weldwithout the addition of filler metal. The weld seam (8) is then cooledand processed through a set of sizing/shaping rolls which cold-form itinto a round (9), square (10) or rectangular (11) Weld-Square (ERW) ProcessIn the weld mill, driven forming dies progressively shape the flat strip(1) by forming the top two corners (2)

of Fy = 50 ksi (ASTM A500 Gr. C) to support a concentrated axial compressive load of 220 kips. The effective length, KL, with respect to the minor axis is 16 feet. The effective length, KL, with respect to the major axis is 30 feet. Enter the Fy = 50 ksi table (page 51) for the 10-inch x 6-inch rectangular ERW HSS.

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