SMALL ELECTRIC WELDED STEEL TUBE MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide a small electric-resistance welded steel tube manufacturing method for favorably preventing straightening crack. SOLUTION: In the small electric-resistance welded steel tube manufacturing method, a steel strip 10 is continuously fed out and formed in a tubular shape...

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Bibliographische Detailangaben
1. Verfasser:	KOKUBO SHINSAKU
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL BROACHING CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING FILING LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOTOTHERWISE PROVIDED FOR MACHINE TOOLS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS PLANING PUNCHING METAL SAWING SCRAPING SHEARING SLOTTING SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a small electric-resistance welded steel tube manufacturing method for favorably preventing straightening crack. SOLUTION: In the small electric-resistance welded steel tube manufacturing method, a steel strip 10 is continuously fed out and formed in a tubular shape with the strip width being rounded; the tubular formed body is subjected to electric-resistance welding to form a tube 11; and the tube is cut to the predetermined length, and then straightened. The temperature before and after the straightening at the front end of the tube is ensured to ≥ 25°C. Alternatively, in addition, the thickness of a rotary blade 5 used for cutting is set to ≤ 3.0 mm, and/or the electric-resistance welding condition is determined so that the width of HAZ of a weld part is set to ≤ (0.4t+1.83) mm (where, t denotes the thickness (mm) of the steel strip). COPYRIGHT: (C)2007,JPO&INPIT