B29C 65/3652

Joining {or sealing} of preformed parts {, e.g. welding of plastics materials}; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction {characterised by the type of elements heated by induction which remain in the joint being a ribbon, band or strip forming a sleeve, e.g. a wrap-around sleeve}