| 摘要 |
A rotary welding member made of synthetic resin material comprising a post portion, and a disk-shaped flange portion integrally mounted on one end of the post portion and having a plurality of through holes in the direction of wall thickness thereof for the dissipation of an excessive portion of frictional heat generated during a rotary welding process whereby deleterious or degrading effects upon a base plate, to which the rotary welding member is welded, are effectively prevented.
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