| 摘要 |
<p>The device has an annular heating appliance (4), generating radiation heat, by means of which appliance the ends of the tubular parts (1a, 1b) to be welded are heated to the melting range of the thermoplastic material. Two outer supporting rings (5a, 5b), which are pushed together after melting, and an expandable inner supporting means (6) ensure that a solid, beadless welded joint is produced by the welding pressure generated. …<IMAGE>… </p> |
