B29C 65/3468

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" {characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings }