Blade and rotor for a gas turbine and method for linking blade parts

A method for joining blade parts of a gas turbine, comprising the steps of:

• providing a blade-body section having at least one end joining area and at least one further blade part, wherein the further blade part includes a shroud-band section having a second blade-body section, the second blade-body section including an end joining area;
• positioning the end joining areas of the blade-body section and the further blade part substantially in alignment with and at a distance from one another;
• arranging an inductor around a circumference of the end joining areas of the blade-body section and the further blade part so that the inductor is disposed at a greater distance from the end joining area in a region of a blade leading edge and a blade trailing edge than in a center region of the blade;
• and
• welding the blade-body section and the further blade part to one another by energizing the inductor and by bringing the blade-body section and the further blade part together with the end joining areas touching one another, the inductor being energized with a high-frequency current at a frequency in a range of 0.75 MHz and 1.2 MHz.

A method for joining blade parts of a gas turbine, comprising the steps of:

• providing a blade-body section having at least one end joining area and at least one further blade part having an end joining area;
• positioning the end joining areas of the blade-body section and the further blade part substantially in alignment with- and at a distance from one another;
• arranging an inductor around a circumference of the end joining areas of the blade-body section and the further blade part so that the inductor is disposed at a greater distance from the end joining area in a region of a blade leading edge and a blade trailing edge than in a center region of the blade;
• and
• welding the blade-body section and the further blade part to one another by energizing the inductor and by bringing the blade-body section and the further blade part together with the end joining areas touching one another, the inductor being energized with a high-frequency current at a frequency in a range of 0.75 MHz and 1.2 MHz, wherein the welding step includes the substeps of welding a first joining area of the blade-body section to a blade root having a second blade-body section and the end joining area, and welding an opposite, second end joining area of the blade-body section to a shroud-band section having a second blade-body section and the end joining area.

A blade for a gas turbine, comprising:

• a blade-body section;
• and
• at least one further blade part;
• wherein an end face of each of the blade-body section and the at least one further blade part including a joining area, the joining areas being welded to one another by bringing the blade-body section and the further blade part together with a low force and by induction welding with a high-frequency current at a frequency within a range of 0.75 MHz to 1.2 MHz while forming a forged structure.

A blade for a gas turbine, comprising:

• a blade-body section;
• and
• at least one further blade part, wherein the further blade part includes a shroud-band section having a second blade-body section, the second blade-body section having a joining area;
• wherein an end face of each of the blade-body section and the at least one further blade part including a joining area, the joining areas being welded to one another by induction welding with a high-frequency current at a frequency within a range of 0.75 MHz to 1.2 MHz while forming a forged structure.

A rotor for a gas turbine, comprising:

• a rotor carrier having a circumferential surface, a plurality of stub sections projecting beyond the circumferential surface, each stub section having an end joining area;
• and
• a plurality of blade-body sections, each of the blade-body sections having an end joining area;
• wherein an end face of the end joining area of the stub section and an end face of the end joining area of a respective blade-body section are welded by induction welding with a high-frequency current at a frequency in a range of 0.75 MHz to 1.2 MHz while forming a forged structure substantially without reworking steps.