| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heating coil for pipe jointing, which does not require an operation for checking leakage of cooling liquid for each jointing operation. <P>SOLUTION: A set of split-type coils 11 are provided by connecting a lead part 13 to one end of an arc-shaped curved part 12. An upstream path 14 and a downstream path 15 are provided to each split-type coil 11 along the shapes of the lead part 13 and the curved part 12 in a coil width direction, and a folded flow channel 16 is provided on a tip side of the curved part 12. While a pipe member is abutted, an outer side of an abutting end is surrounded by each curved part 12, so as to connect tips 12X of the respective curved parts 12. Electricity is conducted via each curved part 12 between the respective lead parts 13, and at each split-type coil 11, cooling liquid flowing from a cooling water introduction port of the lead part 13 is made to flow through the upstream path 14 of the lead part 13 and the curved part 12, turn at the folded flow channel 16 and flow to the downstream path of the curved part 12 and the lead part 13, and is discharged from a cooling liquid discharge port of the lead part 13. <P>COPYRIGHT: (C)2012,JPO&INPIT |
