| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing an electric resistance welded tube excellent in weld zone characteristics by which good quality of welding can be held by appropriately imparting tapered shapes to the end parts of a sheet (band material) before electric resistance welding when manufacturing the electric resistance welded tube. SOLUTION: A tapered shape with a taper angle of 25-40°and with a taper height of 50-90% of the thickness is imparted to the end parts on the side of the upper surface of the band material 20 with a cutting tool 3 and also a tapered shape with a taper angle of 25-40°and with a taper height of 20-40% of the thickness is imparted to the end parts on the side of the outside of a tube 30 in the final stand 4a of a fin pass forming stand 4. COPYRIGHT: (C)2008,JPO&INPIT
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