Methods of manufacturing a tandem guide vane segment

1. A method for manufacturing a tandem guide vane segment that comprises an outer platform, a front guide vane, and a rear guide vane, wherein the front guide vane and the rear guide vane are arranged fixedly spaced apart on the outer platform with the front guide vane overlapping the rear guide vane by a fixed distance in an axial direction, wherein the method comprises:

manufacturing an integral front segment section that comprises the front guide vane and a front section of the outer platform;

manufacturing an integral rear segment section that comprises the rear guide vane and a rear section of the outer platform;

connecting the integral front segment section and the integral rear segment section;

manufacturing the integral front segment section to include a rear limiting line to the integral rear segment section in an area of the outer platform;

manufacturing the integral rear segment section to include a front limiting line to the integral front segment section in the area of the outer platform;

wherein the integral front segment section and the integral rear segment section form a connection along the rear limiting line and the front limiting line, wherein the connection has at least one chosen from an S-shape and a Z-shape; and

wherein the front guide vane does not protrude beyond the rear limiting line, and the rear guide vane does not protrude beyond the front limiting line.

2. The method according to claim 1 , further comprising manufacturing the tandem guide vane segment to include an inner platform, wherein the integral front segment section further comprises a front section of the inner platform, and the integral rear segment section further comprises a rear section of the inner platform.

3. The method according to claim 2 , further comprising:

manufacturing the integral front segment section to include a second rear limiting line to the integral rear segment section in an area of the inner platform;

manufacturing the integral rear segment section to include a second front limiting line to the integral front segment section in the area of the inner platform;

wherein the integral front segment section and the integral rear segment section form a connection along the second rear limiting line and the second front limiting line in the area of the inner platform, wherein the connection is one chosen from an S-shape and a Z-shape; and

wherein the front guide vane does not protrude beyond the second rear limiting line, and the rear guide vane does not protrude beyond the second front limiting line.

4. The method according to claim 1 , further comprising manufacturing the tandem guide vane segment to include an inner platform, wherein the inner platform is formed integrally only with the front segment section.

5. The method according to claim 1 , further comprising:

manufacturing the tandem guide vane segment with exactly one front guide vane and exactly one rear guide vane.

6. The method according to claim 1 , further comprising:

manufacturing the tandem guide vane segment with a plurality of front guide vanes arranged at a distance from each other in a circumferential direction;

manufacturing the tandem guide vane segment with a plurality of rear guide vanes arranged at a distance from each other in the circumferential direction; and

manufacturing a tandem vane which includes one front guide vane from the plurality of front guide vanes and one rear guide vane from the plurality of rear guide vanes.