A method for forming a connection between two tubular sections having a polymeric outer surface jacket, using electrofusion to fusion bond a casing of similar, non-crosslinked polymer to the outer surface of the tubular sections.

A device for joining a first component to be welded to a second component to be welded, the joining device having at least one electrically conductive, resistive heating film which comprises a central connection portion and two lateral electrical connection portions. The joining device comprises at least one first electrical insulation member which is positioned in contact with the first face of the heating film, and at least one second electrical insulation member which is positioned in contact with the second face of the heating film, the two electrical insulation members being configured to allow the transfer of heat and to prevent the flow of electric current between the heating film and each component to be welded.

A method for bonding two fiber composite components with each other to form a fiber composite structure includes integrating conductive fibers underneath a bonding surface of at least one of the two fiber composite components, each conductive fiber comprising a carbon fiber coated with an electrically insulating coating, the conductive fibers running along the bonding surface and protruding at least at their ends from the respective fiber composite component; arranging the two fiber composite components against each other at their respective bonding surfaces; passing an electric current through the conductive fibers by electrically contacting the conductive fibers at their protruding ends so that the respective fiber composite component is heated at the bonding surface to a curing temperature; and joining the two fiber composite components with each other at their bonding surfaces via secondary bonding, co-bonding and/or co-curing at the curing temperature, thereby forming the fiber composite structure.