Transcription of HOLLOW STRUCTURAL SECTIONS
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HOLLOW STRUCTURAL SECTIONS
HOLLOW STRUCTURAL SECTIONSDIMENSIONS AND SECTION PROPERTIESE lectric 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 the square or rectangular tubein the initial forming station. Subsequent stations form the bottom twocorners (3) of the shape. No cold working of the sides of the shape isperformed, and the shape s seam is welded by high-frequency contactswhen the tube is near its final shape and size .
radii equal to 3.6 times the design wall thickness for SAW sections with 5/8 inch nominal wall thicknesses;and 3.0 times the design wall thickness for SAW sections with nominal wall thicknesses equal to 1/2 inch and 3/8 inch. General availability information for each size of HSS manufactured to ASTM A500 Grade B is contained in The Steel Tube
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