Composite conductor, in particular for glow plugs for diesel engines

Composite electric conductor comprising:

• an elongate ceramic inner conductor;
• an elongate ceramic outer conductor enclosing the ceramic inner conductor, and an insulator arranged between the ceramic inner conductor and the ceramic outer conductor;
• an elongate metallic inner conductor which is connected to the ceramic inner conductor in an electrically conductive manner;
• and
• an elongate metallic outer conductor which is connected to the ceramic outer conductor in an electrically conductive manner,
• wherein both of the ceramic conductors and their corresponding metallic conductors are fitted one in the other and make contact primarily via a common lateral surface extending obliquely to their longitudinal direction and via an oppositely arranged inner surface, said surfaces being hard-soldered one to the other.