Transcription of HOLLOW STRUCTURAL SECTIONS - McGill University
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HOLLOW STRUCTURAL SECTIONS - McGill University
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.
forged together by weld rolls to create a continuous longitudinal weld without the addition of filler metal. The weld seam (8) is then cooled ... when the tube is near its final shape and size. The welded tube (4) is ... not exceed 3.50% of the data based upon the minimum permissible wall thickness stipulated in ASTM A500. This is consis-
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