| 摘要 |
<p>A device for manufacturing electric resistance welded pipe, in which two end parts (2a, 2b) facing an opening (2) of an open pipe (1) are melted by an induction current generated by an induction heating means, and joined at a join portion, wherein the apparatus includes a ferromagnet (9) including an inside section (8a) extending in the running direction inside the open pipe (1) and inside an induction coil (3), an outside section (8b) extending in the running direction outside the open pipe (1) and outside the induction coil (3), and a center section (8c) extending in a pipe inside-outside direction of the open pipe (1) between the inside section (8a) and the outside section (8b) at a position at the upstream side of the induction coil (3). An open side of a portion of the ferromagnet (9) configured by portions of the inside section (8a) and the outside section (8b) further to the downstream side than the center section (8c), and the center section (8c), is disposed facing the running direction (R) downstream side, and a closed circuit of magnetic flux is formed passing through the inside section (8a), the center section (8c), and the outside section (8b).</p> |
