MANUFACTURE OF STEEL TUBE

PROBLEM TO BE SOLVED: To manufacture a steel tube having good straightness by forming a steel sheet into a cylinder, fixing both ends of the cylinder in a state where bending distortion by which a seam side is made convex is imparted to the cylinder and welding the inside surface. SOLUTION: In a met...

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Bibliographische Detailangaben
Hauptverfasser:	ARAKAWA TAKEKAZU, MIYAMARU MASASHI
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING 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 PUNCHING METAL SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To manufacture a steel tube having good straightness by forming a steel sheet into a cylinder, fixing both ends of the cylinder in a state where bending distortion by which a seam side is made convex is imparted to the cylinder and welding the inside surface. SOLUTION: In a method for manufacturing steel tubes by forming the steel sheet into the cylinder 1 and, next, welding the seam 7 in the longitudinal direction of the cylinder 7 at least from the side of the inside surface, after fixing both ends of the cylinder 1 by fixing means 2 in the state where bending distortion by which the seam side is made convex is imparted to the cylinder 1, the inside surface is welded. When the inside surface is welded in the state where both ends are fixed, since bend (downward bend) such as the seam is made convex is pre-liminarily imparted, upward bend (the direction that the seam is made concave) which is finally generated by welding the inside surface and the downward bend which is preliminarily imparted are mutually canceled and the steel tube having reduced bend is obtained.