| 摘要 |
PROBLEM TO BE SOLVED: To improve dimensional accuracy, realize stable welding, reduce the number of roll stages, and produce beads protruded only outward to facilitate cutting/removing when welding. SOLUTION: In this method to manufacture a deformed metallic pipe through roll forming, a deformed tubular bent body having a pair of portions inclined outward for butt welding is formed from a metallic strip through forming process, and an electroseamed pipe T1 having a top wall 3 of inverted V shape in the cross section is manufactured via welding process to protrude beads only outward and bead cutting process. The electroseamed pipe T1 consists of a bottom wall 4, right and left side wall 5, the top wall 3 of inverted V shape in cross section, and right and left shoulder walls 6 of a concave arc shape in cross section to connect the top wall 3 and the side walls 5. Then the top wall 3 of inverted V shape in cross section is flattened, and the deformed metallic pipe having specified cross-sectional shape is produced through sizing process to make the top wall horizontal and straight.
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