Electron emission cathode, esp. for electron beam welding gun - has conical support for cathode disc to reduce heat dissipation

An indirectly heated, electron emitter cathode assembly comprises a heating device and a cathode disc with fixing elements, mounted on a support having a hollow truncated cone shape, the edge of at least one of the bases of which is bent to form a lip or flange directed towards the interior of the cone. The cathode assembly is used esp. in an electron beam welding gun. The contact area between the cathode and the support and fixing elements can be reduced by a factor of four so that the power reqd. for heating the cathode can be reduced by a half while maintaining the cathode surface stable. Additionally, temp. gradients across the cathode are reduced so that uniform electron emission is obtd. L'INVENTION CONCERNE LES TECHNIQUES UTILISANT LES FAISCEAUX ELECTRONIQUES.L'ENSEMBLE CATHODIQUE FAISANT L'OBJET DE L'INVENTION EST DU TYPE COMPORTANT, MONTEE SUR UN SUPPORT1, UNE CATHODE DISCOIDALE2 AVEC DES ELEMENTS DE FIXATION3 ET UN MOYEN DE CHAUFFAGE4, ET EST CARACTERISE EN CE QUE LE SUPPORT1 A LA FORME D'UN CONE TRONQUE CREUX DONT LE BORD D'AU MOINS L'UNE DES BASES EST PLIE DE FACON A FORMER UN REBORD OU BRIDE5 DIRIGE VERS L'INTERIEUR DUDIT CONE.L'INVENTION S'APPLIQUE AUX APPAREILS FORMANT UN FAISCEAU ELECTRONIQUE EN PARTICULIER POUR UN CANON ELECTRONIQUE DE SOUDAGE.