Disc stack, rotor unit, centrifugal separator, method of providing disc stack, and method of providing rotor unit

A centrifugal separator for gas separation, comprising

• a disc stack of frustoconical separation discs configured to be mounted in a separation chamber of a centrifugal separator, the disc stack comprising:
• discs stacked upon each other in a manner forming narrow separation spaces between adjacent discs, each of the discs having an upper surface and a lower surface;
• a first end disc at a first axial end of the disc stack and a second end disc at a second axial end of the disc stack;
• welding sections extending between the upper surfaces and lower surfaces of the discs, the welding sections extending in a radial direction of the discs,
• wherein the disc stack is configured to rotate around a rotation axis during operation,
• wherein the discs are welded to each other via the welding sections, and
• wherein the welding sections extend beyond a circumferential edge of the respective disc.