Management method of powder supply head, and method and apparatus for forming erosion shield

Patent metadata

Field	Value
Publication number	US-10245678-B2
Application number	US-201515123506-A
Country	US
Kind code	B2
Filing date	Apr 1, 2015
Priority date	Apr 7, 2014
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A management method of a powder supply head in which supplied cladding metal is stabilized, and a method and apparatus for forming an erosion shield. The powder supply head has a double tube that supplies the cladding metal to a cladding portion and includes an inner tube that sprays a cladding metal used for cladding by welding and an outer tube that concentrically overlaps the inner tube and sprays a shielding air. The method including: spraying the cladding metal from the powder supply head to a test region; measuring a width of the cladding metal sprayed onto the test region; in a case where the measured width of the cladding metal is an allowance or smaller, determining that the powder supply head is usable, and in a case where the measured width of the cladding metal is greater than the allowance, determining that the powder supply head is unusable.

First claim

The invention claimed is:

1. A management method of a powder supply head which has a double tube in which an inner circumference side tube that sprays a cladding metal used for cladding by welding using a laser and an outer circumference side tube that is disposed at an outer circumference of the inner circumference side tube and sprays a shielding air overlap concentrically, and supplies the cladding metal to a cladding portion, the method comprising:
a spraying process of spraying the cladding metal from the powder supply head to a test region under set conditions and forming a line segment by the cladding metal sprayed to the test region;
a width measurement process of measuring a width of the cladding metal sprayed onto the test region;
a determination process of, in a case where the measured width of the cladding metal is an allowance or smaller, determining that the powder supply head is usable, and in a case where the measured width of the cladding metal is greater than the allowance, determining that the powder supply head is unusable.

2. The management method of a powder supply head according to claim 1 ,
wherein, in the inner circumference side tube, an end surface on a side where the cladding metal is sprayed is processed into a surface perpendicular to an axial direction of the inner circumference side tube.

3. The management method of a powder supply head according to claim 1 ,
wherein the test region is provided with an adhesive material.

4. The management method of a powder supply head according to claim 1 , further comprising:
an oxygen concentration measurement process of measuring a concentration of oxygen of the test region during the spraying process,
wherein in the determination process, in a case where the concentration of oxygen measured in the oxygen concentration measurement process is an allowance or lower, it is determined that the powder supply head is usable, and in a case where the measured concentration of oxygen is higher than the allowance, it is determined that the powder supply head is unusable.

5. A method for forming an erosion shield on at least one of a tip end and a blade surface of a rotor blade body, comprising:
a process of forming a boundary by removing at least a portion of a tip end and an end surface of a base body which is to become the rotor blade;
a process of forming a cladding portion through laser welding on the boundary using a powder supply nozzle which is determined to be usable in the management method of a powder supply head according to claim 1 ; and
a process of performing finish processing to remove an excess thickness portion of the base body and a portion of the cladding portion.

6. A method for producing a rotor blade comprising:
a base body production process of forming a base body having an excess thickness portion in a rotor blade; and
a process of forming an erosion shield on a blade body in the method for forming an erosion shield according to claim 5 .

7. A powder supply head comprising:
an inner circumference side tube which sprays a cladding metal used for cladding by welding; and
an outer circumference side tube that is disposed to overlap concentrically with an outer circumference of the inner circumference side tube and sprays a shielding air,
wherein, in the inner circumference side tube, an end surface on a side where the cladding metal is sprayed is a surface perpendicular to an axial direction of the inner circumference side tube.

8. A method for forming an erosion shield on at least one of a tip end and a blade surface of a rotor blade body, comprising:
a process of forming a boundary by removing at least a portion of a tip end and an end surface of a base body which is to become the rotor blade;
a process of forming a cladding portion through laser welding on the boundary using a powder supply nozzle having the powder supply head according to claim 7 ; and
a process of performing finish processing to remove an excess thickness of the base body and a portion of the cladding portion.

9. A method for producing a rotor blade comprising:
a base body production process of forming a base body having an excess thickness portion in the rotor blade; and
a process of forming an erosion shield on a blade body in the method for forming an erosion shield according to claim 8 .

10. A cladding by welding apparatus comprising:
the powder supply head according to claim 7 ; and
a laser processing head that emits a laser,
wherein the cladding metal is supplied through the powder supply head while a cladding portion is irradiated with the laser by the laser processing head.

Assignees

• Mitsubishi Hitachi Power Sys
• Mitsubishi Hitachi Popower System Ltd

Inventors

• Okuda Takehisa
• Machida Motonari
• Matsunami Yasuo

Classifications

• F02C7/00

  Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants (controlling F02C9/00) · CPC title

• B23K26/144 Primary

  the fluid stream containing particles, e.g. powder · CPC title

• B23K26/34 Primary

  Laser welding for purposes other than joining · CPC title

• B23K26/147

  Features outside the nozzle for feeding the fluid stream towards the workpiece · CPC title

• B23K2101/001

  Turbines · CPC title