JP2012020308A - Method for repairing metal component and the repaired metal component - Google Patents

Method for repairing metal component and the repaired metal component Download PDF

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JP2012020308A
JP2012020308A JP2010159339A JP2010159339A JP2012020308A JP 2012020308 A JP2012020308 A JP 2012020308A JP 2010159339 A JP2010159339 A JP 2010159339A JP 2010159339 A JP2010159339 A JP 2010159339A JP 2012020308 A JP2012020308 A JP 2012020308A
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cooling hole
metal
cooling
hole
wire
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JP5535799B2 (en
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Yujiro Watabe
裕二郎 渡部
Koji Tsukimoto
晃司 月元
Masahiko Mega
雅彦 妻鹿
Masahiko Onda
雅彦 恩田
Yosuke Kawauchi
洋介 河内
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Mitsubishi Heavy Industries Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/06—Cooling passages of turbine components, e.g. unblocking or preventing blocking of cooling passages of turbine components

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing a metal component, enabling a reduction of a weld crack even when performing build-up welding repair of the vicinity of a cooling hole, and to provide a repaired metal component.SOLUTION: In a rotor blade 11 which is exposed to high temperature and has cooling holes 15 for cooling, a part of the cooling holes 15 is performed with beveling together with the crack having occurred near the cooling holes 15 from the front face side, the cooling holes 15 are each performed with hole plugging process by use of a wire 22 made of a similar-metal material after the beveling, a portion performed with the hole plugging process is smoothed, build-up welding is performed to the portion performed with the beveling and the smoothed portion to form a build-up part 25, and the initial cooling holes 15 are reworked to the wires 22 and the build-up part 25, so that the rotor blade 11 is repaired by the build-up welding.

Description

本発明は、ガスタービン、ジェットエンジン等において、高温に曝される金属部品の補修方法及び補修された金属部品に関する。   The present invention relates to a method for repairing a metal part exposed to a high temperature and a repaired metal part in a gas turbine, a jet engine or the like.

ガスタービン、ジェットエンジン等には、１０００℃以上の高温に曝される金属部品（高温部品）が存在する。例えば、図１に示すガスタービンの動翼１１は、そのような金属部品の１つであり、長期の運転後には、翼本体１２の翼頂部１２ａ、翼面１２ｂやプラットホーム部１３に亀裂Ｃが発生していることがある。このような亀裂Ｃは、グラインダ、放電加工等で亀裂部周辺を除去した後、拡散ろう付、肉盛溶接等で補修されている。   Gas turbines, jet engines, and the like have metal parts (high-temperature parts) that are exposed to high temperatures of 1000 ° C. or higher. For example, the moving blade 11 of the gas turbine shown in FIG. 1 is one of such metal parts. After a long period of operation, the blade top 12a, the blade surface 12b and the platform portion 13 of the blade body 12 have cracks C. It may have occurred. Such cracks C are repaired by diffusion brazing, overlay welding or the like after the periphery of the crack is removed by a grinder, electric discharge machining or the like.

特開２００５−３０５４９２号公報Japanese Patent Laying-Open No. 2005-305492 特開２００３−２０６７４８号公報JP 2003-206748 A

翼頂部１２ａ、翼面１２ｂやプラットホーム部１３には、冷却用の空気を流すため、複数の冷却孔１５、１６が設けられている。翼頂部１２ａ、翼面１２ｂやプラットホーム部１３に亀裂Ｃが発生し、冷却孔１５、１６の近傍が補修部位となるとき、ろう材で補修を行った場合には、ろう材が冷却孔１５、１６から流出してしまったり、冷却孔１５、１６を塞いでしまったりするおそれがある。このため、特許文献１、２においては、補修開先内に埋め込み材（パイプ、ダミーピン等）を入れて、ろう材の流出防止、孔形成を行っている。   A plurality of cooling holes 15 and 16 are provided in the blade top portion 12a, the blade surface 12b, and the platform portion 13 in order to flow cooling air. When cracks C occur in the blade top portion 12a, the blade surface 12b, and the platform portion 13 and the vicinity of the cooling holes 15 and 16 is a repair site, when the brazing material is repaired, the brazing material becomes the cooling hole 15, 16 may flow out of the cooling hole 16 or may block the cooling holes 15 and 16. For this reason, in Patent Documents 1 and 2, an embedding material (pipe, dummy pin, etc.) is placed in the repair groove to prevent the brazing material from flowing out and to form a hole.

ろう付で補修を行う場合、補修部位の高強度化が図れない等の問題がある。そこで、補修部位の高強度化のために、肉盛溶接補修（ＴＩＧ（Tungsten Inert Gas）肉盛溶接、プラズマ肉盛溶接、レーザ粉体肉盛溶接等）を行うことがある。しかしながら、肉盛溶接補修の場合、肉盛が厚くなると、溶接割れを起こす可能性が高い。特に、冷却孔１５、１６が補修部位にある場合には、冷却孔１５、１６を基点に溶接割れ（高温割れ）が発生しやすい。そのため、従来は、冷却孔１５、１６を避けて、補修を行っており、又、プラットホーム部１３では、冷却孔１６まで到達する亀裂Ｃがある場合には、補修そのものを断念していた。   When repairing by brazing, there is a problem that the strength of the repaired part cannot be increased. Therefore, in order to increase the strength of the repaired part, overlay welding repair (TIG (Tungsten Inert Gas) overlay welding, plasma overlay welding, laser powder overlay welding, etc.) may be performed. However, in the case of overlay welding repair, if the overlay is thick, there is a high possibility of causing weld cracking. In particular, when the cooling holes 15 and 16 are in the repair site, weld cracking (hot cracking) is likely to occur with the cooling holes 15 and 16 as a base point. For this reason, conventionally, repair is performed while avoiding the cooling holes 15, 16, and in the platform portion 13, when there is a crack C reaching the cooling hole 16, the repair itself is abandoned.

本発明は上記課題に鑑みなされたもので、冷却孔近傍の肉盛溶接補修を行う場合でも、溶接割れを低減可能な金属部品の補修方法及び補修された金属部品を提供することを目的とする。   The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method for repairing a metal part capable of reducing weld cracks and a repaired metal part even when performing overlay welding repair in the vicinity of a cooling hole. .

上記課題を解決する第１の発明に係る金属部品の補修方法は、
高温に曝されると共に冷却のための冷却孔を有する金属部品において、前記冷却孔の周りに発生した亀裂を補修する金属部品の補修方法であって、
前記亀裂と共に前記冷却孔の一部を当該金属部品の表面側から開先加工し、
開先加工後、共金系材料を用いて、前記冷却孔を孔埋め加工し、
孔埋め加工した部分をスムージング加工し、
開先加工した部分及びスムージング加工した部分に肉盛溶接を行い、
孔埋め加工した部分及び肉盛溶接した部分に、当初の冷却孔を再加工して、当該金属部品を肉盛溶接により補修することを特徴とする。 A repair method of a metal part according to the first invention for solving the above-described problems is as follows.
In a metal part that is exposed to a high temperature and has a cooling hole for cooling, a method for repairing a metal part that repairs a crack generated around the cooling hole,
A part of the cooling hole along with the crack is grooved from the surface side of the metal part,
After the groove processing, the cooling hole is filled using a common metal material,
Smooth the hole-filled part,
Overlay welding is performed on the grooved and smoothed parts,
The original cooling hole is reworked in the hole-filled portion and the overlay welded portion, and the metal part is repaired by overlay welding.

上記課題を解決する第２の発明に係る金属部品の補修方法は、
上記第１の発明に記載の金属部品の補修方法において、
前記孔埋め加工は、
前記冷却孔に共金系材料からなるワイヤを挿入すると共に、共金系材料を用いて、前記冷却孔の周囲と前記ワイヤとを溶接するか、
又は、
前記冷却孔自身を当該金属部品の表面側から開先加工し、当該開先加工部分を、共金系材料を用いて、肉盛溶接するか、
いずれか一方であることを特徴とする。 The metal part repair method according to the second invention for solving the above-mentioned problems is
In the method for repairing a metal part according to the first invention,
The hole filling process is
Inserting a wire made of a metal alloy material into the cooling hole and welding the wire around the cooling hole with the wire using the metal alloy material,
Or
The cooling hole itself is grooved from the surface side of the metal part, and the grooved part is overlay welded using a common metal material,
It is either one.

上記課題を解決する第３の発明に係る金属部品の補修方法は、
高温に曝されると共に冷却のための冷却孔を有する金属部品において、前記冷却孔の周りに発生した亀裂を補修する金属部品の補修方法であって、
前記冷却孔に共金系材料からなるワイヤを挿入し、
前記亀裂と共に前記冷却孔の一部及び前記ワイヤの一部を当該金属部品の表面側から開先加工し、
開先加工後、共金系材料を用いて、前記冷却孔の周囲と前記ワイヤとを溶接し、
溶接した部分をスムージング加工し、
開先加工した部分及びスムージング加工した部分に肉盛溶接を行い、
前記ワイヤを挿入した部分及び肉盛溶接した部分に、当初の冷却孔を再加工して、当該金属部品を肉盛溶接により補修することを特徴とする。 The metal part repair method according to the third invention for solving the above-mentioned problems is as follows.
In a metal part that is exposed to a high temperature and has a cooling hole for cooling, a method for repairing a metal part that repairs a crack generated around the cooling hole,
Insert a wire made of a co-metal material into the cooling hole,
Along with the crack, a part of the cooling hole and a part of the wire are grooved from the surface side of the metal part,
After the groove processing, using a common metal material, the periphery of the cooling hole and the wire are welded,
Smooth the welded part,
Overlay welding is performed on the grooved and smoothed parts,
The original cooling hole is reworked in the portion where the wire is inserted and the portion where build-up welding is performed, and the metal part is repaired by build-up welding.

上記課題を解決する第４の発明に係る補修された金属部品は、
高温に曝されると共に冷却のための冷却孔を有する金属部品であって、
前記冷却孔の周りに発生した亀裂と共に前記冷却孔の一部を当該金属部品の表面側から開先加工し、
開先加工後、共金系材料を用いて、前記冷却孔を孔埋め加工し、
孔埋め加工した部分をスムージング加工し、
開先加工した部分及びスムージング加工した部分に肉盛溶接を行い、
孔埋め加工した部分及び肉盛溶接した部分に、当初の冷却孔を再加工することによって、
肉盛溶接により補修された補修部位を具備することを特徴とする。 The repaired metal part according to the fourth invention for solving the above-mentioned problems is
A metal part that is exposed to high temperatures and has cooling holes for cooling,
With a crack generated around the cooling hole, a part of the cooling hole is grooved from the surface side of the metal part,
After the groove processing, the cooling hole is filled using a common metal material,
Smooth the hole-filled part,
Overlay welding is performed on the grooved and smoothed parts,
By reworking the original cooling hole in the hole-filled part and the overlay welded part,
It comprises a repaired part repaired by overlay welding.

上記課題を解決する第５の発明に係る補修された金属部品は、
上記第４の発明に記載の補修された金属部品において、
前記孔埋め加工は、
前記冷却孔に共金系材料からなるワイヤを挿入すると共に、共金系材料を用いて、前記冷却孔の周囲と前記ワイヤとを溶接するか、
又は、
前記冷却孔自身を当該金属部品の表面側から開先加工し、当該開先加工部分を、共金系材料を用いて、肉盛溶接するか、
いずれか一方であることを特徴とする。 The repaired metal part according to the fifth invention for solving the above-mentioned problems is
In the repaired metal part according to the fourth invention,
The hole filling process is
Inserting a wire made of a metal alloy material into the cooling hole and welding the wire around the cooling hole with the wire using the metal alloy material,
Or
The cooling hole itself is grooved from the surface side of the metal part, and the grooved part is overlay welded using a common metal material,
It is either one.

上記課題を解決する第６の発明に係る補修された金属部品は、
高温に曝されると共に冷却のための冷却孔を有する金属部品であって、
前記冷却孔に共金系材料からなるワイヤを挿入し、
前記冷却孔の周りに発生した亀裂と共に前記冷却孔の一部及び前記ワイヤの一部を当該金属部品の表面側から開先加工し、
開先加工後、共金系材料を用いて、前記冷却孔の周囲と前記ワイヤとを溶接し、
溶接した部分をスムージング加工し、
開先加工した部分及びスムージング加工した部分に肉盛溶接を行い、
前記ワイヤを挿入した部分及び肉盛溶接した部分に、当初の冷却孔を再加工することによって、
肉盛溶接により補修された補修部位を具備することを特徴とする。 The repaired metal part according to the sixth invention for solving the above-mentioned problems is
A metal part that is exposed to high temperatures and has cooling holes for cooling,
Insert a wire made of a co-metal material into the cooling hole,
With a crack generated around the cooling hole, a part of the cooling hole and a part of the wire are grooved from the surface side of the metal part,
After the groove processing, using a common metal material, the periphery of the cooling hole and the wire are welded,
Smooth the welded part,
Overlay welding is performed on the grooved and smoothed parts,
By reworking the original cooling hole in the part where the wire is inserted and the part where the weld is built up,
It comprises a repaired part repaired by overlay welding.

本発明によれば、高温に曝される金属部品の冷却孔近傍の肉盛溶接補修を行う場合でも、溶接割れを低減して、肉盛溶接補修を行うことができ、補修部位の高強度化を図ることが可能となる。つまり、金属部品に対して、許容欠陥を超える亀裂が無く、品質の高い肉盛溶接補修方法を提供することになり、又、許容欠陥を超える亀裂が無く、品質の高い肉盛溶接補修した金属部品を提供することが可能となる。   According to the present invention, even when overlay welding repair is performed in the vicinity of a cooling hole of a metal part exposed to high temperature, weld cracking can be reduced and overlay welding repair can be performed, and the strength of the repaired portion is increased. Can be achieved. In other words, for metal parts, there will be no crack exceeding the allowable defect and a high quality overlay welding repair method will be provided, and there will be no crack exceeding the allowable defect and the high quality overlay welding repaired metal. Parts can be provided.

ガスタービンの動翼に発生する亀裂を説明する図である。It is a figure explaining the crack which generate | occur | produces in the moving blade of a gas turbine. 図１に示した動翼のＡ１−Ａ１線矢視断面図である。FIG. 2 is a cross-sectional view taken along line A1-A1 of the moving blade shown in FIG. 図１に示した動翼の翼頂部を拡大した図である。It is the figure which expanded the blade top part of the moving blade shown in FIG. 図３に示した動翼の翼頂部のＡ２−Ａ２線矢視断面図である。It is A2-A2 arrow directional cross-sectional view of the blade top part of the moving blade shown in FIG. 図４に示した動翼の翼頂部に対する開先加工を説明する図である。FIG. 5 is a view for explaining groove processing for the blade top portion of the moving blade shown in FIG. 4. 図５に示した動翼の翼頂部に対する孔埋め加工を説明する図である。It is a figure explaining the hole-filling process with respect to the blade top part of the moving blade shown in FIG. 図６に示した動翼の翼頂部に対するスムージング加工を説明する図である。It is a figure explaining the smoothing process with respect to the blade top part of the moving blade shown in FIG. 図７に示した動翼の翼頂部に対する本肉盛溶接加工を説明する図である。It is a figure explaining this overlay welding process with respect to the blade top part of the moving blade shown in FIG. 図８に示した動翼の翼頂部に対する冷却孔再加工を説明する図である。It is a figure explaining the cooling hole rework with respect to the blade top part of the moving blade shown in FIG. 図１に示した動翼のプラットホーム部を抜き出した図である。It is the figure which extracted the platform part of the moving blade shown in FIG. 図１０に示した動翼のプラットホーム部のＢ−Ｂ線矢視断面図である。It is a BB arrow directional cross-sectional view of the platform part of the moving blade shown in FIG. 図１１に示した動翼のプラットホーム部に対する開先加工を説明する図である。FIG. 12 is a diagram for explaining groove processing for the platform portion of the moving blade shown in FIG. 11. 図１２に示した動翼のプラットホーム部に対する孔埋め加工を説明する図である。It is a figure explaining the hole-filling process with respect to the platform part of the moving blade shown in FIG. 図１３に示した動翼のプラットホーム部に対するスムージング加工を説明する図である。It is a figure explaining the smoothing process with respect to the platform part of the moving blade shown in FIG. 図１４に示した動翼のプラットホーム部に対する本肉盛溶接加工を説明する図である。It is a figure explaining this overlay welding process with respect to the platform part of the moving blade shown in FIG. 図１５に示した動翼のプラットホーム部に対する冷却孔再加工を説明する図である。It is a figure explaining the cooling hole rework with respect to the platform part of the moving blade shown in FIG.

以下、本発明に係る金属部品の補修方法及び補修された金属部品の実施形態について、そのいくつかを図１〜図１６を参照して説明する。なお、以下の実施例においては、ガスタービンの動翼を例にとって説明を行うが、本発明は、他の金属部品、例えば、ガスタービンの静翼、ジェットエンジンの部品等にも適用可能である。   Hereinafter, some embodiments of the repair method of a metal part and the repaired metal part according to the present invention will be described with reference to FIGS. In the following embodiments, a description will be given by taking a moving blade of a gas turbine as an example, but the present invention is also applicable to other metal parts such as a stationary blade of a gas turbine, a jet engine part, and the like. .

（実施例１）
まず、図１、図２を参照して、ガスタービンの動翼を簡単に説明する。動翼１１は、図１に示すように、タービンロータ（図示省略）の外周方向に延設される翼本体１２と、翼本体１２の内周側の基部に設けられたプラットホーム部１３と、プラットホーム部１３の内周側に設けられた固定部１４とを一体化したものである。このような動翼１１は、１０００℃以上の高温に曝されるため、ニッケル基超合金、コバルト基超合金等の金属が用いられている。又、翼本体１２は、図２に示すように、中空部１７を有する中空構造となっており、翼本体１２を空冷するために、中空部１７から翼本体１２の表面側へ貫通する複数の冷却孔１５が設けられている。又、プラットホーム部１３にも空冷のための冷却孔１６が複数設けられている。 Example 1
First, a moving blade of a gas turbine will be briefly described with reference to FIGS. As shown in FIG. 1, the moving blade 11 includes a blade main body 12 extending in the outer peripheral direction of a turbine rotor (not shown), a platform portion 13 provided at a base portion on the inner peripheral side of the blade main body 12, and a platform. The fixing portion 14 provided on the inner peripheral side of the portion 13 is integrated. Since such a moving blade 11 is exposed to a high temperature of 1000 ° C. or higher, a metal such as a nickel-base superalloy or a cobalt-base superalloy is used. Further, as shown in FIG. 2, the wing body 12 has a hollow structure having a hollow portion 17, and a plurality of holes penetrating from the hollow portion 17 to the surface side of the wing body 12 in order to air-cool the wing body 12. Cooling holes 15 are provided. The platform portion 13 is also provided with a plurality of cooling holes 16 for air cooling.

そして、本実施例では、図１及び図３に示すように、翼頂部１２ａに発生した亀裂Ｃを対象としている。本実施例の場合、亀裂Ｃを含む領域が補修部位２１となるが、亀裂Ｃの周りに冷却孔１５がある場合、つまり、補修部位２１に冷却孔１５が含まれるとき、補修部位２１の肉盛溶接を行った場合には、前述したように、冷却孔１５を基点に、溶接割れが発生しやすかった。   In this embodiment, as shown in FIGS. 1 and 3, the crack C generated in the blade tip 12a is targeted. In the case of the present embodiment, the region including the crack C becomes the repair site 21, but when the cooling hole 15 exists around the crack C, that is, when the repair site 21 includes the cooling hole 15, the thickness of the repair site 21 is increased. When prime welding was performed, as described above, welding cracks were likely to occur with the cooling hole 15 as a base point.

そのため、本実施例では、溶接割れを低減するため、まず、冷却孔１５の孔埋めを行った後に肉盛溶接層を形成し、その後、孔埋め部分及び肉盛部分に冷却孔１５を再加工することにより、補修を行っている。この補修方法の具体的な手順を、図４〜図９を参照して説明する。   Therefore, in this embodiment, in order to reduce weld cracking, first, the weld hole is formed after filling the cooling hole 15, and then the cooling hole 15 is reworked in the hole filling part and the overlay part. The repair is done by doing. A specific procedure of this repair method will be described with reference to FIGS.

（１）補修部位の開先加工
最初に、亀裂Ｃ及び近傍の冷却孔１５の一部を含む補修部位２１の開先加工を行う。この開先加工は、例えば、グラインダ、放電加工、機械加工が望ましく、これにより、動翼１１の表面側から整形加工している（図４、図５参照）。なお、後述するように、冷却孔１５にワイヤ２２を挿入する場合には、先にワイヤ２２を挿入し、その後、補修部位２１の開先加工を行うことにより、挿入したワイヤ２２も同時に開先加工してよい。 (1) Groove Processing of Repair Site First, the groove processing of the repair site 21 including the crack C and a part of the nearby cooling hole 15 is performed. For example, a grinder, an electric discharge machining, or a machining process is desirable for the groove machining, and the shaping is performed from the surface side of the rotor blade 11 (see FIGS. 4 and 5). As will be described later, when the wire 22 is inserted into the cooling hole 15, the wire 22 is inserted first, and then the repaired portion 21 is grooved, so that the inserted wire 22 is also simultaneously grooved. May be processed.

（２）冷却孔の孔埋め施工
次に、冷却孔１５に対して孔埋め施工を行う。具体的には、以下の（２ａ）〜（２ｄ）の方法が適用可能である。 (2) Filling of cooling holes Next, filling of the cooling holes 15 is performed. Specifically, the following methods (2a) to (2d) are applicable.

（２ａ）ワイヤ挿入＋溶接
冷却孔１５にワイヤ２２を挿入し、ＴＩＧ溶接、レーザ溶接、ろう付等を用いて、挿入したワイヤ２２と冷却孔１５の周囲とを溶接材２３により溶接することにより、孔埋め施工を行う（図６参照）。このとき、挿入したワイヤ２２と冷却孔１５の周囲とは、少なくとも、開先加工側（図６中では外側）において溶接を行うが、ワイヤ２２を支持するため、開先加工側の反対側（図６中では中空部１７側）で溶接してもよい。 (2a) Wire insertion + welding By inserting the wire 22 into the cooling hole 15 and welding the inserted wire 22 and the periphery of the cooling hole 15 with the welding material 23 using TIG welding, laser welding, brazing, or the like. Then, hole filling is performed (see FIG. 6). At this time, the inserted wire 22 and the periphery of the cooling hole 15 are welded at least on the groove processing side (outside in FIG. 6). However, in order to support the wire 22, In FIG. 6, welding may be performed on the hollow portion 17 side.

（２ｂ）肉盛溶接
冷却孔１５に対して、ＴＩＧ肉盛溶接、レーザ粉体肉盛溶接、ろう付等を行うことにより、孔埋め施工を行う。 (2b) Overlay welding For the cooling holes 15, filling is performed by performing TIG overlay welding, laser powder overlay welding, brazing, or the like.

（２ｃ）冷却孔自体の開先加工＋肉盛溶接
冷却孔１５が細い場合には、冷却孔１５自体の開先加工を先に行い、その後、ＴＩＧ肉盛溶接、レーザ粉体肉盛溶接、ろう付等を行うことにより、孔埋め施工を行う。 (2c) groove processing of the cooling hole itself + overlay welding When the cooling hole 15 is thin, the groove processing of the cooling hole 15 itself is performed first, and then TIG overlay welding, laser powder overlay welding, Hole filling is performed by brazing.

（２ｄ）その他
冷却孔１５に対して、粉末挿入、溶射、機械的なかしめ等を行うことにより、孔埋め施工を行う。 (2d) Others The hole filling is performed on the cooling hole 15 by inserting powder, spraying, mechanical caulking, or the like.

孔埋め施工方法しては、上記（２ａ）〜（２ｄ）の方法が適用可能であるが、動翼１１のような金属部品は、狭隘部位（冷却孔１５）での溶接割れ及び融合不良が懸念されるため、低入熱手法であったり、冷却孔１５の開先加工を行ったりする（２ａ）又は（２ｃ）の方法が望ましい。特に、［ワイヤ挿入＋ＴＩＧ溶接］又は［冷却孔自体の開先加工＋ＴＩＧ肉盛溶接］の場合は、予め、冷却孔１５の長手方向に沿って奥の方まで孔埋めしているため、本肉盛溶接時における冷却孔１５の影響を最小限にでき、より効果的に、肉盛補修溶接の安定化、溶接割れを防止することができる。   As the hole filling construction method, the above methods (2a) to (2d) can be applied. However, metal parts such as the moving blade 11 have weld cracks and poor fusion in the narrow part (cooling hole 15). Since there is a concern, the method (2a) or (2c) in which a low heat input method or a groove processing of the cooling hole 15 is performed is desirable. In particular, in the case of [wire insertion + TIG welding] or [groove processing of the cooling hole itself + TIG build-up welding], since the hole is filled in advance along the longitudinal direction of the cooling hole 15, The influence of the cooling hole 15 at the time of prime welding can be minimized, and stabilization of the overlay repair welding and weld cracking can be prevented more effectively.

又、いずれの孔埋め施工の場合であっても、溶接割れの発生を抑制するために、ワイヤ２２、溶接材２３等の孔埋め材料の材質は、動翼１１を構成する母材より柔らかい材料がよく、共金系材料（Ｎｉ基合金、Ｃｏ基合金）で、Ｔｉ、Ａｌの少ない溶接割れの発生しにくい材料（例えば、インコネル６２５）が望ましい。   Further, in any hole filling construction, in order to suppress the occurrence of weld cracking, the material of the hole filling material such as the wire 22 and the welding material 23 is a material softer than the base material constituting the moving blade 11. It is preferable to use a material (for example, Inconel 625) that is a common metal-based material (Ni-based alloy, Co-based alloy) and is less likely to cause weld cracking with less Ti and Al.

（３）孔埋め部のスムージング
次の手順で行う本肉盛溶接を安定させるため、グラインダ等を用いて、孔埋め部２４の余肉のスムージングを行う（図７参照）。 (3) Smoothing of hole filling portion In order to stabilize the main build-up welding performed in the following procedure, the surplus thickness of the hole filling portion 24 is smoothed using a grinder or the like (see FIG. 7).

（４）開先部の本肉盛溶接
補修部位２１を、ＴＩＧ肉盛溶接、レーザ粉体肉盛溶接等を用いて、本肉盛溶接を行い、肉盛部２５を形成する（図８参照）。このとき、補修部位２１を高温で予熱して、ＴＩＧ肉盛溶接、レーザ粉体肉盛溶接等を行ってもよい。従来、冷却孔１５を埋めていない場合には、冷却孔１５の存在により、肉盛が不安定となり、肉盛り部分が割れるおそれがあるが、冷却孔１５を孔埋めした本実施例の場合、肉盛が安定化し、肉盛部の割れ防止が可能となる。なお、肉盛部分の材料としては、インコネル７３８ＬＣをベースとした材料を用いている。 (4) Groove build-up welding at the groove portion The build-up portion 25 is formed by performing the build-up welding of the repaired portion 21 using TIG build-up welding, laser powder build-up welding, or the like (see FIG. 8). ). At this time, the repair site 21 may be preheated at a high temperature, and TIG overlay welding, laser powder overlay welding, or the like may be performed. Conventionally, if the cooling hole 15 is not filled, the build-up becomes unstable due to the presence of the cooling hole 15 and the build-up portion may break, but in the case of the present embodiment in which the cooling hole 15 is filled, The build-up is stabilized and the build-up portion can be prevented from cracking. Note that a material based on Inconel 738LC is used as the material for the build-up portion.

（５）冷却孔の再加工
放電加工、機械加工等を用いて、補修部位２１に冷却孔１５を再加工する（図９参照）。これにより、冷却孔１５を埋めた材料（ワイヤ２２、一部の肉盛部２５）は、再加工によって取り除かれることになる。 (5) Reworking of cooling holes The cooling holes 15 are reworked in the repair site 21 by using electric discharge machining, machining, or the like (see FIG. 9). As a result, the material (the wire 22 and the part of the built-up portion 25) filling the cooling hole 15 is removed by rework.

上述した手順により、動翼１１の翼頂部１２ａの冷却孔１５近傍の肉盛溶接補修を行う場合でも、溶接割れを低減して、肉盛溶接補修を行うことができ、補修部位の高強度化を図ることが可能となる。つまり、金属部品に対して、許容欠陥を超える亀裂が無く、品質の高い肉盛溶接補修方法を提供することになり、又、許容欠陥を超える亀裂が無く、品質の高い肉盛溶接補修した金属部品を提供することが可能となる。   According to the procedure described above, even when overlay welding repair is performed near the cooling hole 15 of the blade top portion 12a of the rotor blade 11, weld cracking can be reduced and overlay welding repair can be performed, and the strength of the repaired portion is increased. Can be achieved. In other words, for metal parts, there will be no crack exceeding the allowable defect and a high quality overlay welding repair method will be provided, and there will be no crack exceeding the allowable defect and the high quality overlay welding repaired metal. Parts can be provided.

（実施例２）
本実施例では、図１及び図１０に示すように、プラットホーム部１３に発生した亀裂Ｃを対象としている。本実施例の場合、亀裂Ｃを含む領域が補修部位３１となるが、冷却孔１６まで到達する亀裂Ｃが発生したとき、つまり、補修部位３１に冷却孔１６が含まれるとき、従来は補修自体を断念していた。又、補修部位３１の肉盛溶接を行った場合には、前述したように、冷却孔１６を基点に、溶接割れが発生しやすかった。 (Example 2)
In this embodiment, as shown in FIGS. 1 and 10, the crack C generated in the platform portion 13 is targeted. In the case of the present embodiment, the region including the crack C becomes the repair site 31, but when the crack C reaching the cooling hole 16 occurs, that is, when the repair site 31 includes the cooling hole 16, the repair itself is conventionally performed. Was abandoned. Further, when overlay welding of the repaired part 31 was performed, as described above, welding cracks were likely to occur with the cooling hole 16 as a base point.

そのため、本実施例でも、溶接割れを低減するため、まず、冷却孔１６の孔埋めを行った後に肉盛溶接層を形成し、その後、孔埋め部分及び肉盛部分に冷却孔１６を再加工することにより、補修を行っている。この補修方法の具体的な手順を、図１１〜図１６を参照して説明する。   Therefore, also in the present embodiment, in order to reduce weld cracking, first, the weld hole is formed after filling the cooling hole 16, and then the cooling hole 16 is reworked in the hole filling part and the built-in part. The repair is done by doing. A specific procedure of this repair method will be described with reference to FIGS.

（１）補修部位の開先加工
最初に、亀裂Ｃ及び近傍の冷却孔１６の一部を含む補修部位３１の開先加工を行うが、本実施例の場合、先にワイヤ３２を冷却孔１６に挿入し、その後、補修部位３１の開先加工を行うことにより、挿入したワイヤ３２の一部も同時に開先加工している（図１１、図１２参照）。この開先加工は、例えば、グラインダ、放電加工、機械加工が望ましく、これにより、動翼１１の表面側から整形加工している。放電加工の場合、補修部位３１と併せて、挿入したワイヤ３２も精度良く、加工可能となる。 (1) Groove machining of the repair site First, the groove machining of the repair site 31 including the crack C and a part of the nearby cooling hole 16 is performed. In this embodiment, the wire 32 is first connected to the cooling hole 16. After that, the groove portion of the inserted wire 32 is simultaneously grooved by performing groove processing of the repair region 31 (see FIGS. 11 and 12). For example, a grinder, an electric discharge machining, or a machining process is desirable for the groove machining, and the shaping process is performed from the surface side of the rotor blade 11. In the case of electric discharge machining, the inserted wire 32 can be machined with high accuracy together with the repaired portion 31.

（２）冷却孔の孔埋め施工
次に、開先加工面の孔埋めを行う。具体的には、開先加工面において、ＴＩＧ溶接、レーザ溶接、ろう付等を用いて、挿入したワイヤ３２と冷却孔１６の周囲とを溶接材３３により溶接することにより、孔埋め施工を行う（図１３参照）。 (2) Cooling hole filling process Next, the grooved surface is filled. Specifically, on the groove processing surface, TIG welding, laser welding, brazing, or the like is used to weld the inserted wire 32 and the periphery of the cooling hole 16 with the welding material 33 to perform hole filling. (See FIG. 13).

動翼１１のような金属部品は、狭隘部位（冷却孔１６）での溶接割れ及び融合不良が懸念されるため、孔埋め施工方法しては、低入熱手法である［ワイヤ挿入＋ＴＩＧ溶接］が望ましい。この場合、予め、冷却孔１６の長手方向に沿って奥の方まで孔埋めしているため、本肉盛溶接時における冷却孔１６の影響を最小限にでき、より効果的に、肉盛補修溶接の安定化、溶接割れを防止することができる。   Since metal parts such as the moving blade 11 are concerned about welding cracks and poor fusion at narrow parts (cooling holes 16), the hole filling method is a low heat input method [wire insertion + TIG welding]. Is desirable. In this case, since the holes are filled in advance along the longitudinal direction of the cooling holes 16, the influence of the cooling holes 16 during the overlay welding can be minimized, and the overlay repair can be performed more effectively. Stabilization of welding and weld cracking can be prevented.

又、溶接割れの発生を抑制するために、ワイヤ３２、溶接材３３等の孔埋め材料の材質は、動翼１１を構成する母材より柔らかい材料がよく、共金系材料（Ｎｉ基合金、Ｃｏ基合金）で、Ｔｉ、Ａｌの少ない溶接割れの発生しにくい材料（例えば、インコネル６２５）が望ましい。   Further, in order to suppress the occurrence of weld cracking, the material of the hole filling material such as the wire 32 and the welding material 33 is preferably a softer material than the base material constituting the moving blade 11, and a common metal material (Ni-based alloy, A material (for example, Inconel 625) that is less likely to cause weld cracking with less Ti and Al is desirable.

（３）孔埋め部のスムージング
次の手順で行う本肉盛溶接を安定させるため、グラインダ等を用いて、孔埋め部３４の余肉のスムージングを行う（図１４参照）。 (3) Smoothing of hole filling portion In order to stabilize the main build-up welding performed in the following procedure, the surplus thickness of the hole filling portion 34 is smoothed using a grinder or the like (see FIG. 14).

（４）開先部の本肉盛溶接
補修部位３１を、ＴＩＧ肉盛溶接、レーザ粉体肉盛溶接等を用いて、本肉盛溶接を行い、肉盛部３５を形成する（図１５参照）。このとき、補修部位３１を高温で予熱して、ＴＩＧ肉盛溶接、レーザ粉体肉盛溶接等を行ってもよい。従来、冷却孔１６を埋めていない場合、冷却孔１６の存在により、肉盛が不安定となり、肉盛り部分が割れるおそれがあるが、冷却孔１６を孔埋めした本実施例の場合、肉盛が安定化し、肉盛部の割れ防止が可能となる。なお、肉盛部分の材料としては、インコネル７３８ＬＣをベースとした材料を用いている。 (4) Groove build-up welding at the groove part The build-up part 35 is formed by performing the build-up welding of the repaired portion 31 using TIG build-up welding, laser powder build-up welding, or the like (see FIG. 15). ). At this time, the repair region 31 may be preheated at a high temperature, and TIG overlay welding, laser powder overlay welding, or the like may be performed. Conventionally, when the cooling hole 16 is not filled, the build-up becomes unstable due to the presence of the cooling hole 16 and the built-up portion may be broken. However, in this embodiment in which the cooling hole 16 is filled, the build-up is performed. This stabilizes and prevents cracking of the built-up part. Note that a material based on Inconel 738LC is used as the material for the build-up portion.

（５）冷却孔の再加工
放電加工、機械加工等を用いて、補修部位３１に冷却孔１６を再加工する（図１６参照）。これにより、冷却孔１６を埋めた材料（ワイヤ３２、一部の肉盛部３５）は、再加工によって取り除かれることになる。 (5) Reworking of cooling hole The cooling hole 16 is reworked in the repair region 31 by using electric discharge machining, machining, or the like (see FIG. 16). Thereby, the material (wire 32, some build-up parts 35) which filled the cooling hole 16 is removed by rework.

上述した手順により、動翼１１のプラットホーム部１３の冷却孔１６近傍の肉盛溶接補修を行う場合でも、溶接割れを低減して、肉盛溶接補修を行うことができ、補修部位の高強度化を図ることが可能となる。つまり、金属部品に対して、許容欠陥を超える亀裂が無く、品質の高い肉盛溶接補修方法を提供することになり、又、許容欠陥を超える亀裂が無く、品質の高い肉盛溶接補修した金属部品を提供することが可能となる。   Even when performing overlay welding repair in the vicinity of the cooling hole 16 of the platform portion 13 of the rotor blade 11 by the above-described procedure, it is possible to reduce weld cracking and perform overlay welding repair and increase the strength of the repaired portion. Can be achieved. In other words, for metal parts, there will be no crack exceeding the allowable defect and a high quality overlay welding repair method will be provided, and there will be no crack exceeding the allowable defect and the high quality overlay welding repaired metal. Parts can be provided.

本発明は、高温に曝されると共に冷却孔を有する金属部品、例えば、ガスタービンの動翼、静翼を溶接補修する際に好適なものである。   The present invention is suitable for repairing metal parts exposed to high temperatures and having cooling holes, for example, moving blades and stationary blades of gas turbines.

１１ 動翼
１２ 翼本体
１２ａ 翼頂部
１２ｂ 翼面
１３ プラットホーム部
１５、１６ 冷却孔
２１、３１ 補修部位
２２、３２ ワイヤ
２５、３５ 肉盛部 DESCRIPTION OF SYMBOLS 11 Moving blade 12 Blade body 12a Blade top part 12b Blade surface 13 Platform part 15, 16 Cooling hole 21, 31 Repair part 22, 32 Wire 25, 35 Overlay part

Claims (6)

高温に曝されると共に冷却のための冷却孔を有する金属部品において、前記冷却孔の周りに発生した亀裂を補修する金属部品の補修方法であって、
前記亀裂と共に前記冷却孔の一部を当該金属部品の表面側から開先加工し、
開先加工後、共金系材料を用いて、前記冷却孔を孔埋め加工し、
孔埋め加工した部分をスムージング加工し、
開先加工した部分及びスムージング加工した部分に肉盛溶接を行い、
孔埋め加工した部分及び肉盛溶接した部分に、当初の冷却孔を再加工して、当該金属部品を肉盛溶接により補修することを特徴とする金属部品の補修方法。 In a metal part that is exposed to a high temperature and has a cooling hole for cooling, a method for repairing a metal part that repairs a crack generated around the cooling hole,
A part of the cooling hole along with the crack is grooved from the surface side of the metal part,
After the groove processing, the cooling hole is filled using a common metal material,
Smooth the hole-filled part,
Overlay welding is performed on the grooved and smoothed parts,
A repair method for a metal part, wherein the original cooling hole is reworked in the hole-filled part and the overlay welded part, and the metal part is repaired by overlay welding. 請求項１に記載の金属部品の補修方法において、
前記孔埋め加工は、
前記冷却孔に共金系材料からなるワイヤを挿入すると共に、共金系材料を用いて、前記冷却孔の周囲と前記ワイヤとを溶接するか、
又は、
前記冷却孔自身を当該金属部品の表面側から開先加工し、当該開先加工部分を、共金系材料を用いて、肉盛溶接するか、
いずれか一方であることを特徴とする金属部品の補修方法。 In the repair method of the metal component of Claim 1,
The hole filling process is
Inserting a wire made of a metal alloy material into the cooling hole and welding the wire around the cooling hole with the wire using the metal alloy material,
Or
The cooling hole itself is grooved from the surface side of the metal part, and the grooved part is overlay welded using a common metal material,
A method for repairing a metal part, characterized in that it is either one. 高温に曝されると共に冷却のための冷却孔を有する金属部品において、前記冷却孔の周りに発生した亀裂を補修する金属部品の補修方法であって、
前記冷却孔に共金系材料からなるワイヤを挿入し、
前記亀裂と共に前記冷却孔の一部及び前記ワイヤの一部を当該金属部品の表面側から開先加工し、
開先加工後、共金系材料を用いて、前記冷却孔の周囲と前記ワイヤとを溶接し、
溶接した部分をスムージング加工し、
開先加工した部分及びスムージング加工した部分に肉盛溶接を行い、
前記ワイヤを挿入した部分及び肉盛溶接した部分に、当初の冷却孔を再加工して、当該金属部品を肉盛溶接により補修することを特徴とする金属部品の補修方法。 In a metal part that is exposed to a high temperature and has a cooling hole for cooling, a method for repairing a metal part that repairs a crack generated around the cooling hole,
Insert a wire made of a co-metal material into the cooling hole,
Along with the crack, a part of the cooling hole and a part of the wire are grooved from the surface side of the metal part,
After the groove processing, using a common metal material, the periphery of the cooling hole and the wire are welded,
Smooth the welded part,
Overlay welding is performed on the grooved and smoothed parts,
A method for repairing a metal part, comprising reworking an original cooling hole in a portion where the wire is inserted and a portion where overlay welding is performed, and repairing the metal component by overlay welding. 高温に曝されると共に冷却のための冷却孔を有する金属部品であって、
前記冷却孔の周りに発生した亀裂と共に前記冷却孔の一部を当該金属部品の表面側から開先加工し、
開先加工後、共金系材料を用いて、前記冷却孔を孔埋め加工し、
孔埋め加工した部分をスムージング加工し、
開先加工した部分及びスムージング加工した部分に肉盛溶接を行い、
孔埋め加工した部分及び肉盛溶接した部分に、当初の冷却孔を再加工することによって、
肉盛溶接により補修された補修部位を具備することを特徴とする補修された金属部品。 A metal part that is exposed to high temperatures and has cooling holes for cooling,
With a crack generated around the cooling hole, a part of the cooling hole is grooved from the surface side of the metal part,
After the groove processing, the cooling hole is filled using a common metal material,
Smooth the hole-filled part,
Overlay welding is performed on the grooved and smoothed parts,
By reworking the original cooling hole in the hole-filled part and the overlay welded part,
A repaired metal part having a repaired part repaired by overlay welding. 請求項４に記載の補修された金属部品において、
前記孔埋め加工は、
前記冷却孔に共金系材料からなるワイヤを挿入すると共に、共金系材料を用いて、前記冷却孔の周囲と前記ワイヤとを溶接するか、
又は、
前記冷却孔自身を当該金属部品の表面側から開先加工し、当該開先加工部分を、共金系材料を用いて、肉盛溶接するか、
いずれか一方であることを特徴とする補修された金属部品。 The repaired metal part according to claim 4,
The hole filling process is
Inserting a wire made of a metal alloy material into the cooling hole and welding the wire around the cooling hole with the wire using the metal alloy material,
Or
The cooling hole itself is grooved from the surface side of the metal part, and the grooved part is overlay welded using a common metal material,
Repaired metal parts characterized by being either one. 高温に曝されると共に冷却のための冷却孔を有する金属部品であって、
前記冷却孔に共金系材料からなるワイヤを挿入し、
前記冷却孔の周りに発生した亀裂と共に前記冷却孔の一部及び前記ワイヤの一部を当該金属部品の表面側から開先加工し、
開先加工後、共金系材料を用いて、前記冷却孔の周囲と前記ワイヤとを溶接し、
溶接した部分をスムージング加工し、
開先加工した部分及びスムージング加工した部分に肉盛溶接を行い、
前記ワイヤを挿入した部分及び肉盛溶接した部分に、当初の冷却孔を再加工することによって、
肉盛溶接により補修された補修部位を具備することを特徴とする補修された金属部品。 A metal part that is exposed to high temperatures and has cooling holes for cooling,
Insert a wire made of a co-metal material into the cooling hole,
With a crack generated around the cooling hole, a part of the cooling hole and a part of the wire are grooved from the surface side of the metal part,
After the groove processing, using a common metal material, the periphery of the cooling hole and the wire are welded,
Smooth the welded part,
Overlay welding is performed on the grooved and smoothed parts,
By reworking the original cooling hole in the part where the wire is inserted and the part where the weld is built up,
A repaired metal part having a repaired part repaired by overlay welding.
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