JPH01200004A - Method for welding erosion control plate of turbin moving blade - Google Patents
Method for welding erosion control plate of turbin moving bladeInfo
- Publication number
- JPH01200004A JPH01200004A JP2211088A JP2211088A JPH01200004A JP H01200004 A JPH01200004 A JP H01200004A JP 2211088 A JP2211088 A JP 2211088A JP 2211088 A JP2211088 A JP 2211088A JP H01200004 A JPH01200004 A JP H01200004A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- titanium alloy
- turbine rotor
- turbin
- moving blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003628 erosive effect Effects 0.000 title claims abstract description 39
- 238000003466 welding Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 10
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 27
- 230000035515 penetration Effects 0.000 claims abstract description 10
- 238000003483 aging Methods 0.000 claims abstract description 8
- 230000002265 prevention Effects 0.000 claims description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052786 argon Inorganic materials 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 5
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 238000010894 electron beam technology Methods 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910001347 Stellite Inorganic materials 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は耐エロージヨン性の優れたタービン動翼が得ら
れ′るチタン合金を含むタービン動翼のエロージョン防
止板溶接方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for welding an erosion prevention plate for a turbine rotor blade containing a titanium alloy, by which a turbine rotor blade with excellent erosion resistance can be obtained.
蒸気タービンの動翼には１２％Ｃｒステンレス鋼や、１
７−４ＰＨステンレス鋼が使用されているが、低圧段に
はチタン合金から成る動翼も使用されはじめてきた。Steam turbine rotor blades are made of 12% Cr stainless steel or 1
Although 7-4PH stainless steel is used, rotor blades made of titanium alloys are also beginning to be used in low pressure stages.
蒸気タービンの低圧段に使用されるタービン動翼は、タ
ービン運転中に蒸気中の水滴によって蒸気入口部にエロ
ージョンが発生することがあった。１２％Ｃｒステンレ
ス鋼や、１７−４ＰＨステンレス鋼のタービン動翼では
エロージョンを防止するためにステライト合金を肉盛溶
接したシ、ステライト合金から成るエロージヨン防止片
を電子ビーム溶接したシ、あるいはステライト合金から
成る薄いエロージョン防止板をろう付けしたシしている
。In turbine blades used in the low-pressure stage of a steam turbine, erosion may occur at the steam inlet due to water droplets in the steam during turbine operation. Turbine rotor blades made of 12% Cr stainless steel or 17-4PH stainless steel are made of stellite alloy overlay welded to prevent erosion, erosion prevention pieces made of stellite alloy that are electron beam welded, or made of stellite alloy. It consists of a thin erosion-prevention plate that is brazed to the top.
チタン合金から成るタービン動翼においても、１２１０
ｒステンレス鋼や１７−４ＰＨステンレス鋼から成るタ
ービン動翼と同様に蒸気入口部にエロージョンの発生す
るおそれがある。Even in turbine rotor blades made of titanium alloy, 1210
Similar to turbine rotor blades made of stainless steel or 17-4PH stainless steel, erosion may occur at the steam inlet.
この対策として、タービン動翼と同じチタン合金であっ
て、溶接が可能であシ、かつ硬い準安定β型チタン合金
片（ｒｉ−ｘｓＭｏ−ｓｚｒ）を電子ビーム溶接によっ
て接合することが考えられている。（実開昭６２〜６７
９０２号公報参照）第５図は従来のタービン動翼１にβ
型チタン合金片２を電子ビーム３によって完全連込みの
貫通溶接を実施している状況を示す図である。As a countermeasure to this problem, it has been considered to join pieces of a metastable β-type titanium alloy (ri-xsMo-szr), which is the same titanium alloy as the turbine rotor blades but is also weldable and hard, by electron beam welding. There is. (Actual development from 1986 to 1983)
(Refer to Publication No. 902) Figure 5 shows a conventional turbine rotor blade 1 with β
FIG. 2 is a diagram showing a state in which complete penetration welding of a type titanium alloy piece 2 is performed using an electron beam 3.
この場合には入熱を多くする必要があシ溶接部４の幅は
広くなり、冷却速度が遅くなって溶接部の強度、延性が
劣る。In this case, it is necessary to increase the heat input, and the width of the welded part 4 becomes wide, and the cooling rate becomes slow, resulting in poor strength and ductility of the welded part.
チタン合金（Ｔｉ−ｓＡｎ−４Ｖ）の電子ビーム溶接に
関する報告
（昭和６０年３月４日発行「鉄と鋼ＪｔｔｋＬ５゜Ｖｏ
ｌ ７１ ＰｄＡＲ１９８５日本鉄鋼協会第１０９会
講演大会、講演概要集■）
から知られているようくいチタン合金は入熱量が多くな
シ、溶接部の幅が広くなると強度および延性が低下する
。このため、入熱量を制限して部分溶込みとし、次いで
反対側からもビーム金照射し、２回の照射によって全体
を接合することが考えられる。しかしながら、チタン合
金は活性金属であるため一回目の照射で溶接部周辺にス
ケール（酸化皮膜）が発生し、スケールの付着した状態
で反対面から溶接すると、ピンホール、ポロシティ等の
溶接欠陥が発生しやすい。−回目の溶接で発生したスケ
ールを除去しようとすれば、電子ビーム溶接であれば、
真空チャンバー内の高真空雰囲気を一旦大気圧に戻して
、スケール除去を行った後、再びチャンバの真空引きを
行なう必要があシ、工数がか＼多年経済であるという問
題点があった。本発明はかかる現状に鑑みなされたもの
で、容易にかつ動翼の強度を損なうことなく、また溶接
時の変形が少なく、耐エロージヨン性の優れたタービン
動翼を得ることができるタービン動翼のエロージヨン防
止板溶接方法を提供することを目的とするものである。Report on electron beam welding of titanium alloy (Ti-sAn-4V) (published on March 4, 1985, “Tetsu to Hagane JttkL5°Vo
71 PdAR 1985 Japan Iron and Steel Institute 109th Conference, Collection of Lecture Abstracts ■) The titanium alloy known from Japan has a large amount of heat input, and as the width of the weld increases, the strength and ductility decrease. For this reason, it is conceivable to limit the amount of heat input to achieve partial penetration, then irradiate the gold beam from the opposite side as well, and join the entire structure by two irradiations. However, since titanium alloy is an active metal, scale (oxide film) is generated around the welded area by the first irradiation, and when welding from the opposite side with scale attached, welding defects such as pinholes and porosity will occur. It's easy to do. - If you are trying to remove the scale generated during the first welding, if you use electron beam welding,
After the high vacuum atmosphere in the vacuum chamber is once returned to atmospheric pressure and scale removed, it is necessary to evacuate the chamber again, which poses a problem in that it requires a lot of man-hours and costs money over many years. The present invention has been made in view of the current situation, and it is possible to easily obtain a turbine rotor blade with excellent erosion resistance, without deteriorating the strength of the rotor blade, and with less deformation during welding. The object of the present invention is to provide a method for welding plates to prevent erosion.
本発明は、電子ビーム溶接とほぼ同等の高エネルギー密
度を有し、かつ、大気の雰囲気で、アルゴンガスのよう
な不活性ガスでシールドして実施できるレーザビーム溶
接に着目したものであり、チタン合金を含むタービン動
翼の蒸気入口部に時効硬化盤のチタン合金を含むエロー
ジヨン防止板を当着した後、前記当着部忙レーザビーム
を照射して３ｍｓ以下の溶接幅で部分溶込みを行ない接
合することを特徴とするタービン動翼のエロージョン防
止板溶接方法を提案するものである。The present invention focuses on laser beam welding, which has almost the same high energy density as electron beam welding and can be performed in an atmospheric atmosphere while shielding with an inert gas such as argon gas. After attaching an erosion prevention plate containing a titanium alloy of an age-hardened plate to the steam inlet part of a turbine rotor blade containing an alloy, the abutment area is irradiated with a laser beam to perform partial penetration with a welding width of 3 ms or less. The present invention proposes a welding method for erosion prevention plates for turbine rotor blades, which is characterized by joining.
チタン合金を含むタービン動翼の蒸気入口部に、時効硬
化型のチタン合金を含むエロージョン防止板をレーザビ
ームで溶接幅の狭い３ｍ以下の溶接幅で部分溶込みを行
なうために１溶接人熱量が少なく溶接部は従来の溶接部
が広い溶接方法の場合とは異なシ、強度や延性の低下が
なく母材よシ硬く、母材と同等かそれ以上の機械的性質
を示しくなお、溶接幅が３襲以上では溶接金属の硬さは
母材より低い）低コストで高品質の溶接ができ、タービ
ン動翼の蒸気入口部の耐エロージヨン性が高められる。In order to partially penetrate an erosion prevention plate containing an age-hardened titanium alloy into the steam inlet of a turbine rotor blade containing a titanium alloy with a narrow welding width of 3 m or less using a laser beam, the amount of heat consumed by one welder is required. Unlike conventional welding methods where the weld area is wider, the weld area is harder than the base metal without any loss in strength or ductility, and exhibits mechanical properties equal to or better than the base metal. However, if the weld metal has three or more strokes, the hardness of the weld metal is lower than that of the base metal), high-quality welding can be performed at low cost, and the erosion resistance of the steam inlet of the turbine rotor blade is improved.
第１図〜第４図により本発明の実施例について説明する
。Embodiments of the present invention will be described with reference to FIGS. 1 to 4.
第１図は本発明の１実施例の説明図で、第１図において
、Ｔｉ−６ＡＪ−４Ｖのチタン合金から成るタービン動
翼１の蒸気入口部忙形成した凹部にＴｉ−１５Ｍｏ−５
Ｚｒの準安定β型チタン合金片で時効硬化処理を施した
エロージョン防止板５を当着しアルゴンガス６で溶接部
７周辺をシールドしつつレーザビーム８を照射しまず、
６ＫＪ／ＩＬ以下の入熱で片面よシ部分溶込みをさせて
溶接し、次いで反対面のスケールを除去した後、この面
を前記同様に部分溶込みで溶接して、幅が３ｍ以下の溶
接部７を形成する。FIG. 1 is an explanatory diagram of one embodiment of the present invention. In FIG. 1, a Ti-15Mo-5 is placed in a recess formed in the steam inlet of a turbine rotor blade 1 made of a titanium alloy of Ti-6AJ-4V.
An erosion prevention plate 5 made of a Zr metastable β-type titanium alloy piece subjected to an age hardening treatment is applied, and while the periphery of the welding part 7 is shielded with argon gas 6, a laser beam 8 is irradiated.
Weld with partial penetration on one side with a heat input of 6KJ/IL or less, then remove the scale on the opposite side, and then weld this side with partial penetration in the same manner as above to weld a width of 3m or less. Section 7 is formed.
第２図は本発明の第２実施例の説明図である。FIG. 2 is an explanatory diagram of a second embodiment of the present invention.
第２図において、チタン合金から成るタービン動翼１の
蒸気入口側の一部に（ａ）図に示すように開先成形加工
により切欠部１０を形成する。この切欠部１０の形状に
相応するべく曲げ加工した時効硬化型のチタン合金から
成るエロージョン防止板１１をΦ）図に示すように切欠
部１０に当着する。In FIG. 2, a notch 10 is formed in a part of the steam inlet side of the turbine rotor blade 1 made of a titanium alloy by groove forming as shown in FIG. 2(a). An erosion prevention plate 11 made of an age-hardening titanium alloy and bent to correspond to the shape of the notch 10 is brought into contact with the notch 10 as shown in FIG.
次に（Ｃ）図に示すようにエロージョン防止板１１の上
面よシエロージョン防止板１１の周囲の合わせ部１２に
不活性のアルゴンガス６の雰囲気でレーザビーム８を照
射してエロージョン防止板１１をタービン動翼１に溶接
することによシ、耐エロージヨン性の優れたタービン動
翼１が得られる。Next, as shown in the figure (C), the erosion prevention plate 11 is irradiated with a laser beam 8 from the upper surface of the erosion prevention plate 11 to the mating portion 12 around the erosion prevention plate 11 in an atmosphere of inert argon gas 6. By welding to the turbine rotor blade 1, the turbine rotor blade 1 with excellent erosion resistance can be obtained.
レーザビーム８はエネルギー密度が高いので狭い範囲を
瞬間的に溶かし、かつ入熱を少なくできるので、熱影響
部の少ない高品質の溶接ができる。また電子ビーム溶接
のように高真空のチャンバーに入れる必要がないので、
低コストで実施できる有利さがある。タービン動翼の蒸
気入口部の厚さは薄いので、レーザビーム溶接てはＣＯ
！レーザの他にＹＡＧレーザも適用できる。Since the laser beam 8 has a high energy density, it can instantaneously melt a narrow area and reduce heat input, so high-quality welding with a small heat-affected zone can be performed. Also, unlike electron beam welding, there is no need to put the material in a high vacuum chamber.
It has the advantage of being able to be implemented at low cost. Since the thickness of the steam inlet of the turbine rotor blade is thin, laser beam welding requires CO
! In addition to lasers, YAG lasers can also be used.
レーザビームの照射はエロージヨン防止板の全周に実施
しなくても、その一部に実施することによってでも充分
な接合強さに達し、同様の耐エロージョン効果が得られ
る。また、溶接によるタービン動翼の強度低下を抑える
ために、溶接部１３はタービン動翼１の厚さを超えない
ようにすること、すなわち部分溶込みとすることが肝要
である。Even if the laser beam irradiation is not applied to the entire circumference of the erosion prevention plate, even if it is applied to a part of it, sufficient bonding strength can be achieved and the same erosion prevention effect can be obtained. Furthermore, in order to suppress a decrease in the strength of the turbine rotor blade due to welding, it is important that the welded portion 13 does not exceed the thickness of the turbine rotor blade 1, that is, that it has partial penetration.
レーザビーム８の照射に先立ち、エロージョン防止板１
１を当着した時点で、Ｔ工Ｇ溶接で仮付けすればレーザ
ビーム８での溶接中にエロージョン防止板１１が切欠部
１０から外れることがなく、確実に溶接できる。Prior to irradiation with the laser beam 8, the erosion prevention plate 1 is
1, if it is temporarily attached by T welding, the erosion prevention plate 11 will not come off from the notch 10 during welding with the laser beam 8, and welding can be performed reliably.
タービン動翼１の厚さの薄い部分にエロージョン防止板
１１を当着するには、第３図の第３実施例のようにエロ
ージョン防止板１１を折り曲げて当着してもよく、また
第４図の第４実施例のように曲げ加工を施さずに当着し
、溶接後に端部（刃先部）１４を切削加工してもよい。In order to abut the erosion prevention plate 11 on the thin part of the turbine rotor blade 1, the erosion prevention plate 11 may be bent and abutted as in the third embodiment shown in FIG. As in the fourth embodiment shown in the figure, the ends (blade edges) 14 may be cut without being bent and then welded.
時効硬化型のチタン合金を含むエロージョン防止板１１
は、チタン合金を含むタービン動翼１に溶接できるよう
にチタンを主成分とするものであって、時効硬化処理に
よって著しく硬くできる性質のＴｉ−１５Ｍｏ−５Ｚｒ
＋ Ｔｉ−１５Ｍｏ−５Ｚｒ−３１合金がよく、さらに
これの表層部の全部もしくは一部にレーザ焼入れ（急冷
）や窒化処理のような表面硬化処理を施して一層硬くし
たものであってもレーザビームだよって溶接でき、同様
の効果が得られる。Erosion prevention plate 11 containing age-hardening titanium alloy
Ti-15Mo-5Zr is a material whose main component is titanium so that it can be welded to the turbine rotor blade 1 containing a titanium alloy, and which can be made extremely hard by age hardening treatment.
+Ti-15Mo-5Zr-31 alloy is good, and even if the surface layer is made even harder by performing surface hardening treatment such as laser hardening (quenching) or nitriding treatment on all or part of the surface layer, the laser beam will not work. Therefore, it can be welded and the same effect can be obtained.
上記の実施例の方法によれば、タービン動翼の強度およ
び延性を損うことなく溶接時の変形が少なく、耐エロー
ジヨン性の優れたタービン動翼が得られる。According to the method of the above embodiment, a turbine rotor blade with less deformation during welding and excellent erosion resistance can be obtained without impairing the strength and ductility of the turbine rotor blade.
本発明の方法によれば、チタン合金を含むタービン動翼
の蒸気入口部に時効硬化型のチタン合金を含むエロージ
ョン防止板を当着し、周囲をレーザビーム溶接で部分溶
込みさせて溶接するため、タービン動翼の強さを損なう
ことなく、また溶接時の変形を極力少なく抑えた上で、
耐エロージヨン性の優れたタービン動翼が得られる。According to the method of the present invention, an erosion prevention plate containing an age-hardening titanium alloy is attached to the steam inlet part of a turbine rotor blade containing a titanium alloy, and the surrounding area is partially penetrated and welded by laser beam welding. , without compromising the strength of the turbine rotor blades and minimizing deformation during welding.
A turbine rotor blade with excellent erosion resistance can be obtained.
第１図は本発明の第１実施例の説明図、第２図は本発明
の第２実施例の説明図、第３図は本発明の第３実施例の
説明図、第４図は本発明の第４実施例の説明図、第５図
は従来のタービン動翼のエロージョン防止板溶接方法の
説明図である。
１・・・タービン動翼、２・・・β型チタン合金片、３
・・・電子ビーム、４・・・溶接部、５・・・エロージ
ョン防止板、６・・・アルゴンガス、７・・・溶接部、
８・・・レーザビーム、１０・・・切欠部、１１・・・
エロージョン防止板、１２・・・合せ部、１３・・・溶
接部１４・・・端部
代理人 弁理士 坂 間 暁 外２名
萬１区
ＣＣ）
納３（３） ｆｉＡ関痢５ｍFig. 1 is an explanatory diagram of the first embodiment of the present invention, Fig. 2 is an explanatory diagram of the second embodiment of the invention, Fig. 3 is an explanatory diagram of the third embodiment of the invention, and Fig. 4 is an explanatory diagram of the present invention. FIG. 5 is an explanatory diagram of a fourth embodiment of the invention, and FIG. 5 is an explanatory diagram of a conventional erosion prevention plate welding method for a turbine rotor blade. 1...Turbine rotor blade, 2...β-type titanium alloy piece, 3
... Electron beam, 4... Welded part, 5... Erosion prevention plate, 6... Argon gas, 7... Welded part,
8... Laser beam, 10... Notch, 11...
Erosion prevention plate, 12... Joining part, 13... Welding part 14... Edge Agent Patent attorney Akira Sakama 2 people 1st Ward CC) 3 (3) fiA 5m
Claims (1)
型のチタン合金を含むエロージヨン防止板を当着した後
、前記当着部にレーザビームを照射して３ｍｍ以下の溶
接幅で部分溶込みを行ない接合することを特徴とするタ
ービン動翼のエロージヨン防止板溶接方法。After attaching an erosion prevention plate containing an age-hardening titanium alloy to the steam inlet of a turbine rotor blade containing a titanium alloy, the abutment area is irradiated with a laser beam to achieve partial penetration with a welding width of 3 mm or less. A method for welding erosion prevention plates for turbine rotor blades, the method comprising welding erosion prevention plates for turbine rotor blades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2211088A JPH01200004A (en) | 1988-02-03 | 1988-02-03 | Method for welding erosion control plate of turbin moving blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2211088A JPH01200004A (en) | 1988-02-03 | 1988-02-03 | Method for welding erosion control plate of turbin moving blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01200004A true JPH01200004A (en) | 1989-08-11 |
Family
ID=12073744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2211088A Pending JPH01200004A (en) | 1988-02-03 | 1988-02-03 | Method for welding erosion control plate of turbin moving blade |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01200004A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0780187A1 (en) | 1995-12-22 | 1997-06-25 | Gec Alsthom Electromecanique Sa | Manufacturing process of a blade comprising alpha-beta titanium with an insert at metastable beta titanium and a blade manufactured by such a process |
| EP1649970A1 (en) * | 2004-10-25 | 2006-04-26 | Siemens Aktiengesellschaft | Method of manufacturing a turbine blade made of titanium |
-
1988
- 1988-02-03 JP JP2211088A patent/JPH01200004A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0780187A1 (en) | 1995-12-22 | 1997-06-25 | Gec Alsthom Electromecanique Sa | Manufacturing process of a blade comprising alpha-beta titanium with an insert at metastable beta titanium and a blade manufactured by such a process |
| US5795412A (en) * | 1995-12-22 | 1998-08-18 | Gec Alsthom Electromecanique S.A. | Method of manufacturing and repairing a blade made of α-β titanium |
| EP1649970A1 (en) * | 2004-10-25 | 2006-04-26 | Siemens Aktiengesellschaft | Method of manufacturing a turbine blade made of titanium |
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