METHOD AND DEVICE FOR MANUFACTURING WELDED TUBE

• Main Author: HAYASHI TOMOTAKA
• Format: Patent
• Language: English
• Published: 07.09.1993
• Subjects: 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; ROLLING OF METAL; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

PURPOSE:To reduce an uneven metal between a weld zone and a base metal part, which is generated at the time of contracting the diameter by cold working by a reducer with respect to a welded tube. CONSTITUTION:While carrying a strip S in its longitudinal axial direction, it is formed to an open pipe OP in which both side edge parts E, E in the width direction are opposed to each other by a forming roll group of a breakdown roll 3, a cluster roll 4 and a fin pass roll 5, and both side edge parts E, E of the open pipe OP are set to a heated and melted state by a welding machine 7. Subsequently, both side edge parts E, E are subjected to butt welding by a squeeze roll 6, and thereafter, metal increase forming is executed to a welded tube P by a metal increase forming machine 8, and thereafter, a weld zone is cooled by a cooling device 9, and the diameter reduction is performed, while imparting a stretch by a reducer 10, or without imparting the stretch.