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Method of fabricating a steam turbine blade equipped with erosion shield

A technology for steam turbines, manufacturing methods, applied in the direction of supporting elements of blades, turbines, manufacturing tools, etc., capable of solving problems such as manufacturing cost defects

Active Publication Date: 2015-05-20
MITSUBISHI POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is necessary to prepare a backing member different from the material to be constructed, and the preparation cost of the backing part is incurred, which has disadvantages in terms of manufacturing cost.

Method used

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  • Method of fabricating a steam turbine blade equipped with erosion shield
  • Method of fabricating a steam turbine blade equipped with erosion shield
  • Method of fabricating a steam turbine blade equipped with erosion shield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 (a) to (d) show the manufacturing process of the steam turbine rotor blade according to the first embodiment of the present invention. Shows the leading edge portion of the tip portion of the steam turbine rotor blade. As a raw material for steam turbine moving blades, such as figure 1 As shown in (a), it is composed of a blade portion 1 of a steam turbine rotor blade, an erosion protection sheet 2 , and a spacer 3 arranged between the blade portion 1 and the erosion protection sheet 2 . As the turbine rotor blades, Ti alloys (for example, Ti alloys including A16% and V4%), 12Cr stainless steel, and the like are used. As an anti-corrosion sheet, when the turbine rotor blade is a Ti alloy, use a corrosion-resistant Ti alloy (for example, a Ti alloy including Mo15%, Zr5%, and Al13%), and when the turbine rotor blade is 12Cr stainless steel, use Co-based alloys. As the spacer, a Ti spacer or a Ni-based alloy having hardness lower than that of the turbine rotor...

Embodiment 2

[0032] use figure 2 (a) to (d) illustrate the second embodiment of the present invention. The description of the same parts as those in the first embodiment is omitted.

[0033] In this embodiment, a part of the raw material of the blade portion 1 is used as the burn-through prevention mechanism provided on the electron beam exit side, that is, on the back surface of the slot. In the present embodiment, the joint portion of the material of the blade portion 1 and the corrosion protection sheet 2 is formed in an L-shape. The spacer 3 and the corrosion protection sheet 2 are attached to the L-shaped protruding part (base) of the blade part 1 . The L-shaped protrusion functions as a burn-through prevention mechanism. In addition, as in the first embodiment, after electron beam welding, machining is performed so that the L-shaped protruding portion of the blade portion 1 is also removed to obtain the target rotor blade shape.

[0034] Even in this embodiment, the same effect ...

Embodiment 3

[0036] use image 3 (a) to (d) illustrate the third embodiment of the present invention. The description of the same parts as those in the first embodiment is omitted.

[0037] In this embodiment, a part of the raw material of the erosion resist sheet 2 is used as the burn-through prevention mechanism provided on the electron beam exit side, that is, on the back surface of the slot. In this embodiment, the material of the corrosion protection sheet 2 is formed in an L-shape at the junction with the blade portion 1 . A spacer 3 and an erosion protection sheet 2 having an L-shaped protrusion (base) are attached to the blade portion 1 . The L-shaped protrusion functions as a burn-through prevention mechanism. In addition, as in the first embodiment, after electron beam welding, machining is performed so that the L-shaped protruding portion of the erosion resist sheet 2 is also removed to obtain the target rotor blade shape.

[0038] Even in this embodiment, basically the same...

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PUM

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Abstract

A method of fabrication of a steam turbine blade equipped with an erosion shield includes the steps of preparing constituent elements including the steam turbine blade having a blade part, the erosion shield to be joined to a leading edge part of the blade part on the tip side thereof, and a shim to be disposed between the blade part and the erosion shield, any of the constituent elements having a backing part to serve as a backing for preventing burn through of molten metal at the time of the electron beam welding; assembling the constituent elements; performing electron beam welding to the leading edge part of the blade part, the erosion shield and the shim while utilizing the backing; and machining including removal of the backing part, after the electron beam welding, thereby forming the steam turbine blade in the shape of a final product thereof.

Description

technical field [0001] The present invention relates to a method of manufacturing a steam turbine rotor blade provided with an erosion protection sheet, and more particularly to a method of manufacturing a steam turbine rotor blade by joining the erosion protection sheet to the steam turbine rotor blade by welding. Background technique [0002] In steam turbines or atomic steam turbines, in order to prevent erosion of the leading edge of the steam turbine blades used in wet steam, as described in Patent Documents 1 to 3, the steam at the leading edge of the steam turbine blades On the inflow side, the spacer material is interposed, and the anticorrosion material is joined by TIG welding (tungsten inert gas welding) or electron beam welding. [0003] In general, welding conditions such as acceleration voltage, electron beam current, welding speed, and focal length are finely adjusted for joining by one-layer welding of electron beams in accordance with the type of material or...

Claims

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Application Information

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IPC IPC(8): B23K15/00F01D5/00
CPCB23K15/0066B23K15/0073B23K15/0093B23K37/06B23P15/04B23K2101/001F01D5/147F01D5/288F05D2220/31F05D2230/233C22C14/00C22C38/18F01D5/28F05D2230/10
Inventor 石原干久远藤宏之田中胜巳柏口康治丸山俊之
Owner MITSUBISHI POWER LTD