| 摘要 |
PURPOSE:To form a metal pipe with a simple process and good efficiency by using a lead angle holding knife edge electrode as the electrode in TIG welding and synchronizing and varying the welding current with the pitches of the stoppage and feeding of the pipe forming time. CONSTITUTION:A strip plate W is fed to the inlet port of a press 3 in a certain length each by actuating a feeding device 4. Each lower die of a cutting die 23 and edge bending die 24 is ascended and descended by a driving mechanism 26. A slit is cut on the strip plate W by the cutting die 23, the strip plate W is bent by the curved face of the groove shaped die of the edge bending die 24 with further advance of the strip plate W and formed in a pipe diameter. The butt part is welded by the TIG welding, cut by a cutter 6 and made a product W''. The electrode is made the lead angle holding knife edge flattening in the welding direction and its tip becoming parallel to the base metal face and weld line. The welding current is therefore varied by synchronizing with the stoppage of the forming time and the pitch in feeding. In this way, the pipe can be formed with simple process and good efficiency.
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