Turbine rotor, manufacturing method thereof and steam turbine using turbine rotor

A turbine rotor and rotor technology, applied to turbines, engine components, machines/engines, etc., can solve problems such as differences in thermal physical properties, reduce the frequency of defects, and improve the strength and reliability of the effect

Inactive Publication Date: 2014-01-15
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For this reason, it is necessary to form a penetration weld bead when welding the rotor, but when the combination of rotor materials is dissimilar materials, especially a combination of Ni-based alloy material and iron-based alloy material, the thermal physical properties of the two difference becomes a problem
In this case, (1) movement of elements due to differences in added elements becomes a problem, (2) securing of mechanical properties becomes a problem due to differences in heat treatment conditions, and (3) penetration weld bead is formed due to differences in thermal conductivity become a topic

Method used

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  • Turbine rotor, manufacturing method thereof and steam turbine using turbine rotor
  • Turbine rotor, manufacturing method thereof and steam turbine using turbine rotor
  • Turbine rotor, manufacturing method thereof and steam turbine using turbine rotor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] This embodiment relates to an example in which a Ni-based superalloy and a 12% Cr steel are used from the rotor base materials shown in Table 1 and welded.

[0079] Figure 4 It is a figure which shows the outline|summary of the tungsten inert gas shielded welding apparatus used for the welding of a turbine rotor as an example.

[0080] In this figure, the welding device 40 has a driving device 43 , a welding mechanism 44 , a welding torch 48 , and a control device 47 , and is connected to a gas high-pressure storage tank 49 via a gas hose 52 . The inert gas of the gas high-pressure tank 49 is delivered to the welding torch 48 via a gas hose 51 . As the inert gas, nitrogen, argon, or the like is used. A signal cable 45 for transmitting and receiving signals is provided between the driving device 43 and the control device 47 . A signal cable 46 for transmitting and receiving signals is provided between the welding mechanism 44 and the control device 47 .

[0081] The...

Embodiment 2

[0107] Such as Figure 6 As shown, in Example 1, the overlay 62 is directly applied to the surface of the rotor base material 61 . In contrast, this embodiment is characterized in that in order to eliminate the differences in chemical composition and heat treatment conditions between the high-temperature side rotor base material and the low-temperature side rotor base material, pre-surfacing welding is performed on the groove portion of the high-temperature side rotor base material. . Here, the same parts as those in Embodiment 1 will be omitted, and only the points of difference from Embodiment 1 will be described.

[0108] Figure 7 It is a flow chart showing the welding process of the turbine rotor in this embodiment.

[0109] Compared with the first embodiment, the additional flow in this embodiment is S201-S203.

[0110] First, S101 and S102 are executed in the same manner as in the first embodiment.

[0111] In the pre-surfacing step S201, pre-surfacing welding is p...

Embodiment 3

[0121] Figure 9 It is a continuous sectional view showing the welding process of Example 3.

[0122] Differences between this example and Example 2 will be described using this figure.

[0123] In Example 2, a build-up part 72 is provided on a part of the entire-surface pre-build-up part 71 . On the other hand, in the present embodiment, the overlay welding portion 91 (B) is provided on the low temperature side rotor base material 64 to form the bevel portion 95 (C). Then, the high temperature side rotor base material 61 and the low temperature side rotor base material 64 are butted to form a groove portion 96 (D), a penetration weld bead 97 (E) is formed, and the groove portion 96 is butt welded using a weld metal 98 (F) .

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Abstract

A stable penetration weld bead can be formed in a dissimilar material welded rotor combining two alloy materials under the condition that an enclosed space part is provided with a rotor near a weld section of the weld rotor. A turbine rotor provided by the invention has a high temperature side rotor base material (61) and a low temperature side rotor base material (64). The high temperature side rotor base material (61) is provided with a concavity and a groove (63). The low temperature side rotor base material (64) is provided with a concavity and a groove (65). The concavity of the high temperature side rotor base material and the concavity of the low temperature side rotor base material are oppositely disposed and the enclosed space part is formed between the concavities; the groove of the high temperature side rotor base material and the groove of the low temperature side rotor base material are oppositely disposed and a slot part (66) is formed between the grooves; a buildup welding section (62) having the same components with the high temperature side rotor base material or the low temperature side rotor base material is formed between the high temperature side rotor base material and the low temperature side rotor base material. One side of the buildup welding section in the enclosed space part is provided with a penetration weld bead (67); and the slot part is filled with a weld metal (68).

Description

technical field [0001] The present invention relates to a turbine rotor having a welded portion of dissimilar materials, a manufacturing method thereof, and a steam turbine engine using the turbine rotor. Background technique [0002] A steam turbine engine consists of a boiler, a turbine rotor, moving blades, and a generator. [0003] For large turbine rotors, in addition to the longer shaft length, the high-pressure side requires high-temperature creep rupture strength, and the low-pressure side requires tensile strength and toughness. Therefore, when the steam turbine rotor is formed of a single component, it is difficult to obtain characteristics satisfying the above-mentioned requirements. In particular, as the temperature of the steam rises, the existing ferrous alloys approach the limit as the material of the high-pressure side rotor. [0004] For this reason, studies have been conducted on the use of Ni-based superalloys having better heat resistance than ferrous a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/02
CPCB23K9/048B23K9/167B23K9/173F01D5/063B23P15/006B23K2101/001B23K2101/06B23K9/044F01D5/08
Inventor 西冈映二村田健一远藤一彦佐藤顺生田目寿男今野晋也
Owner MITSUBISHI HITACHIPOWER SYST LTD
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