MANUFACTURE OF ELECTRO-RESISTANCE-WELDED TUBE

• Main Author: HAYASHI TOMOTAKA
• Format: Patent
• Language: English
• Published: 08.09.1992
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING

PURPOSE:To restrain buckling in edge parts and to prevent defective weld by making sections of two metallic strips in the width direction into semicircles through plural roll forming stands and executing electric resistance welding to the edge parts of both facing metallic strips. CONSTITUTION:Steel strips H, H are mutually in parallel fed from uncoilers 1, 1 to a leveler 2, straightened in flat and sent to a roll forming machine. The steel strips H, H are respectively carried between outer rolls and inner rolls and line symmetrically bending formed and symmetrically bending formed so that their sections in the width direction are gradually into a semicircle. After that, both edge parts of the steel strips H, H are heated with welders 7, 7, lateral pressure is applied with squeeze roll 6 and both the steel strips are integrated by executing electric resistance welding of edge parts facing to each other. In this way, butt welding of mutual edge parts are exactly and smoothly executed.