Patent ID: 9346133
Filing Date: 2016-05-24
CPC Classification: B23K,B23P

Claim Text:
1. An apparatus for welding strips with different mechanical properties wound on a support ring, the apparatus comprising: an assembly for winding the strips; a pressing assembly for applying radial pressure onto the strips, comprising a first circular jaw and a second circular jaw arranged opposite each other and spaced in the longitudinal direction by an amount corresponding to the width of a finished seal; and a welding assembly for welding one of the strips, the welding assembly coaxial with the pressing assembly, the welding assembly comprising an energization assembly, springs, a first electrode and a second electrode, the first electrode and the second electrode arranged inside the jaws of the pressing assembly so as to face each other and have a diameter smaller than that of the jaws, each electrode being electrically insulated both from the other electrode and from the jaws by means of rings made of electrically insulating material and the electrodes act simultaneously with pressure in the radial direction on the strips; wherein the energization assembly includes a cover that houses the springs and two fixed conducting rings energized by means of respective conducting pins fixed and connected to an external electric power source, the springs providing an axial thrust in the longitudinal direction against contact brushes that make contact with the electrodes.