| 摘要 |
PURPOSE:To prevent a weld zone being opened and a wire being cut at the stage drawing a fine wire by sliding and crossing the mutual position of the seam part of an inner flux cored tube and the weld zone of an outer tube under specified conditions in case of the manufacture of the seamless flux cored wire for welding a multiple tubular shape. CONSTITUTION:The strip steel H1 for outer tube is formed in a circular arcuated shape by forming rolls 1, 2, shunted by the flux cored inner tube 1 for welding prepd. separately and a guide T1, the inner tube 1 is squeezed by a squeezing roll 4 after working it in the outer tube H2 incorporating the inner tube 1 by closing it with the strip steel H1 for circular arcuated outer tube by forming rolls 3, 4 and the abutting part of the outer tube is welded by a seam welding machine 3 as well. This is subjected to diameter contracting and wire drawing in the wire of smaller diameter by wire drawing machines 6, 7. In this case, the butt welding position of the outer tube H2 and the seam position of the inner tube 1 are made not to be coincide in >=5m in succession and the number of crossings of both positions are attained within 8 times per 10m the wire length. |
