CN111545873A - Method for assembling and welding half-ring of blade grid of self-shrouded diaphragm of steam turbine - Google Patents
Method for assembling and welding half-ring of blade grid of self-shrouded diaphragm of steam turbine Download PDFInfo
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- CN111545873A CN111545873A CN202010291755.7A CN202010291755A CN111545873A CN 111545873 A CN111545873 A CN 111545873A CN 202010291755 A CN202010291755 A CN 202010291755A CN 111545873 A CN111545873 A CN 111545873A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a method for assembling and welding a blade grid semi-ring of a self-shrouded diaphragm of a steam turbine, belonging to the technical field of manufacturing of a static blade grid, aiming at solving the problems of poor dimensional accuracy in the radial direction, inconsistent shrinkage of the upper half and the lower half, large welding amount and poor welding quality of a welded seam after welding the self-shrouded diaphragm static blade grid in the prior art, the invention provides the method for assembling and welding the self-shrouded diaphragm blade grid semi-ring of the steam turbine, wherein a guide blade is arranged on a special tool for assembling and welding the diaphragm static blade grid with the steam outlet side upward, a press ring is covered after each dimension is qualified, one side is tightened by a bolt, then manual tungsten argon arc welding self-melting mode is adopted to perform spot welding and fixing on the position of an inner and outer circle welding groove on the joint surfaces of two adjacent guide blades, then manual electric arc welding is adopted to perform welding and reinforcing, then the process is transferred to a vertical lathe to, and then preheating, welding and stress-relief heat treatment are carried out on the stationary blade cascade.
Description
Technical Field
The invention belongs to the technical field of manufacturing of a clapboard stationary blade grid, and particularly relates to a method for welding a half-ring of a self-shrouded clapboard blade grid of a steam turbine.
Background
The middle-pressure first-stage diaphragm static cascade of CCH03.1201Z and the like, the low-pressure first-stage diaphragm static cascade of CCH03.1401Z/CCH03.1501Z and the like in the ultra-supercritical steam turbine unit are of a self-contained crown structure, in order to realize the assembly welding between the blade assembly welding looping and the diaphragm inner ring and the diaphragm outer ring, the design requires that the adjacent guide blades are welded and connected by adopting a U-shaped groove, the number of welding seams is large because of the large number of the guide blades of the diaphragm (the number of the welding seams is about 2 times of the number of the guide blades), the welding period is also long, the welding quality of each welding seam between the guide blades and the guide blades is difficult to ensure in the welding process, the welded static cascade usually needs to be subjected to defect elimination and repair welding treatment, the defect elimination amount is large, and new welding deformation is.
Because of the large welding workload, the contraction quantity in the circumferential direction is large in the welding process of the baffle stationary blade grid, and the consistency of the contraction quantity of the upper half and the lower half is difficult to ensure, so that the difficulty is increased for reserving welding contraction allowance for welding the front guide blades, and the dimensional accuracy of the baffle steam passage after welding is poor. Therefore, it is necessary to provide a method for welding half-rings of self-shrouded diaphragm blade cascades of steam turbines to solve the above problems.
Disclosure of Invention
The invention provides a semi-circle assembling and welding method for a self-shrouded diaphragm blade grid of a steam turbine, aiming at solving the problems of poor dimensional accuracy, large welding quantity and poor quality of welding seams of the semi-diameter after welding the self-shrouded diaphragm stationary blade grid in the prior art;
a method for assembling and welding a half-ring of a blade grid of a self-shrouded diaphragm of a steam turbine is realized by the following steps:
the method comprises the following steps: determining the number N of the required guide vanes according to the required size of the cascade half-circle and the size of a single guide vane, wherein N is a positive integer;
step two: arranging the steam outlet sides of the N guide blades in the step one upwards, sequentially arranging the guide blades on a special tool for installing and welding the baffle static blade grids, and covering a pressure ring and pressing the baffle static blade grids formed by the arranged guide blades after checking that all sizes of the baffle static blade grids are correct;
step three: tightening one side of the baffle stationary blade grid consisting of the guide blades in the second step by using bolts, and respectively marking welding groove processing positions on the inner and outer bands of the two adjacent guide blades in the baffle stationary blade grid;
step four: performing spot welding fixation on the inner surrounding belt and the outer surrounding belt of two adjacent guide vanes in the third step by adopting a manual argon tungsten-arc welding self-melting mode, and avoiding the position of a welding groove marked in the third step during spot welding;
step five: welding and reinforcing the baffle stationary blade grids fixed by spot welding in the fourth step by adopting manual shielded metal arc welding;
step six: mounting and clamping the baffle stationary blade cascade welded and reinforced in the fifth step and a mounting and welding tool on a working chuck of a vertical lathe, and respectively processing two welding bevels on an inner surrounding belt and an outer surrounding belt of the baffle stationary blade cascade;
step seven: preheating the clapboard static blade grids processed with the welding grooves in the sixth step;
step eight: welding and fixing the baffle stationary blade grids subjected to the preheating treatment in the seventh step along the welding grooves on the inner peripheral belt and the outer peripheral belt respectively;
step nine: and D, performing stress relief treatment on the fixed blade cascade of the partition after the welding groove is welded and fixed in the step eight, and completing the semi-circle welding process of the blade cascade of the partition after the stress relief treatment.
Compared with the prior art, the invention has the following beneficial effects:
the method for welding the blade cascade half ring of the self-shrouded diaphragm of the steam turbine is applied in the welding process of the semi-ring of the fixed blade cascade of the diaphragm such as CCH03.1201Z, CCH01C.121Z-1 and the like, the circumferential direction of the improved blade cascade is reduced by about 1-2mm compared with the size before welding, the shrinkage of the upper half and the lower half is consistent and stable, compared with the scheme that the circumferential direction is shrunk by about 3-6mm during welding of the original fixed blade cascade, the size precision after welding is obviously improved, the welding quality is greatly improved, the size stability of the fixed blade cascade of the diaphragm is improved, the welding time of the improved fixed blade cascade is shortened from 12-15 days to 2-3 days, the working efficiency is greatly improved, and the processing time and the processing cost are saved.
Drawings
FIG. 1 is a schematic sectional view (rear view of welding) of a single vane piece of the present invention;
FIG. 2 is a schematic sectional view of a single vane piece with a welded groove (a schematic view of an unwelded half-turn cut) in the present invention;
Detailed Description
The first embodiment is as follows: the embodiment is explained by referring to fig. 1, and the embodiment provides a method for welding a half-ring of a self-shrouded diaphragm blade cascade of a steam turbine, which is realized by the following steps:
the method comprises the following steps: determining the number N of the required guide vanes according to the required size of the cascade half-circle and the size of a single guide vane, wherein N is a positive integer;
step two: arranging the steam outlet sides of the N guide blades in the step one upwards, sequentially arranging the guide blades on a special tool for installing and welding the baffle static blade grids, and covering a pressure ring and pressing the baffle static blade grids formed by the arranged guide blades after checking that all sizes of the baffle static blade grids are correct;
step three: tightening one side of the baffle stationary blade grid consisting of the guide blades in the second step by using bolts, and respectively marking welding groove processing positions on the inner and outer bands of the two adjacent guide blades in the baffle stationary blade grid;
step four: performing spot welding fixation on the inner surrounding belt and the outer surrounding belt of two adjacent guide vanes in the third step by adopting a manual argon tungsten-arc welding self-melting mode, and avoiding the position of a welding groove marked in the third step during spot welding;
step five: welding and reinforcing the baffle stationary blade grids fixed by spot welding in the fourth step by adopting manual shielded metal arc welding;
step six: mounting and clamping the baffle stationary blade cascade welded and reinforced in the fifth step and a mounting and welding tool on a working chuck of a vertical lathe, and respectively processing two welding bevels on an inner surrounding belt and an outer surrounding belt of the baffle stationary blade cascade;
step seven: preheating the clapboard static blade grids processed with the welding grooves in the sixth step;
step eight: welding and fixing the baffle stationary blade grids subjected to the preheating treatment in the seventh step along the welding grooves on the inner peripheral belt and the outer peripheral belt respectively;
step nine: and D, performing stress relief treatment on the fixed blade cascade of the partition after the welding groove is welded and fixed in the step eight, and completing the semi-circle welding process of the blade cascade of the partition after the stress relief treatment.
In the embodiment, the existing welding structure of the fixed blade grid of the partition is improved, the original welding structure of the fixed blade grid of the partition is welded after U-shaped grooves are processed on adjacent guide blades, so that the problems of poor size precision, large welding quantity, poor welding seam quality and the like after welding are caused, the structure and the shape of the welding grooves of the blade grid are changed after the improvement (refer to fig. 1), N guide blades are fixed by spot welding to form the fixed blade grid of the partition, and then two welding grooves are respectively processed on the inner circle and the outer circle of the fixed blade grid of the partition for final welding fixation.
The second embodiment is as follows: in the sixth embodiment, two welding bevels are formed on the inner and outer circumferential bands of the diaphragm stationary blade cascade, respectively, and the distance between the welding bevels on both sides on the inner circumferential band of the diaphragm stationary blade cascade and the finished surface is about 10mm, and the distance between the welding bevels on both sides on the outer circumferential surface of the diaphragm stationary blade cascade and the finished surface is about 10 mm. Other components and connection modes are the same as those of the first embodiment.
The third concrete implementation mode: the present embodiment will be described with reference to fig. 1, and the present embodiment is further limited to the sixth step described in the second embodiment, in which the welding groove width (distance from the finished surface) in the inner circumferential band of the diaphragm stationary blade cascade in the sixth step is 10 mm. The other components and the connection mode are the same as those of the second embodiment.
The fourth concrete implementation mode: the present embodiment will be described with reference to fig. 1, which further defines the sixth step of the first embodiment, wherein the welding groove width (distance from the finished surface) in the outer peripheral band of the diaphragm stationary blade cascade in the sixth step is 10 mm. Other components and connection modes are the same as those of the first embodiment.
The fifth concrete implementation mode: the present embodiment will be described with reference to fig. 1, which further limits the sixth step described in the fourth embodiment, and in the sixth embodiment, the welding groove depth (from the finished surface) on the inner circumferential band of the diaphragm stationary blade cascade is 5 mm. The other components and the connection mode are the same as those of the fourth embodiment.
The sixth specific implementation mode: the present embodiment will be described with reference to fig. 1, which further defines the sixth step of the first embodiment, wherein the welding groove depth (from the finished surface) on the outer circumferential band of the diaphragm stationary blade cascade in the sixth step is 5 mm. Other components and connection modes are the same as those of the first embodiment.
The seventh embodiment: the present embodiment will be described with reference to fig. 1, and the present embodiment is further limited to the sixth step described in the sixth embodiment, in which the welding included angle at the inner circumferential band of the diaphragm stationary blade cascade in the sixth step is 10 °. Other components and connection modes are the same as those of the sixth embodiment.
The specific implementation mode is eight: the present embodiment will be described with reference to fig. 1, which further defines the sixth step of the first embodiment, and in the sixth step, the welding included angle in the outer circumferential band of the diaphragm stationary blade cascade is 10 °. The other components and the connection mode are the same as those of the seventh embodiment.
The method in the embodiment is applied to the semi-circle welding process of the static blade cascade of the diaphragm such as CCH03.1201Z, CCH01C.121Z-1 and the like, the circumferential direction of the improved blade cascade is reduced by about 1-2mm compared with the size before welding, the upper half shrinkage and the lower half shrinkage are consistent and stable, compared with the scheme that the circumferential direction is reduced by about 3-6mm during welding of the original static blade cascade, the size precision after welding is obviously improved, the welding quality is greatly improved, the size stability of the static blade cascade of the diaphragm is improved, the welding time of the improved static blade cascade is shortened to 2-3 days from 12-15 days before, the working efficiency is greatly improved, and the processing time and the processing cost are saved.
The present invention is not limited to the above embodiments, and any person skilled in the art can make many modifications and equivalent variations by using the above-described structures and technical contents without departing from the scope of the present invention.
Claims (8)
1. A method for welding a half-ring of a blade grid of a self-shrouded diaphragm of a steam turbine is characterized in that: the method is realized by the following steps:
the method comprises the following steps: determining the number N of the required guide vanes according to the required size of the cascade half-circle and the size of a single guide vane, wherein N is a positive integer;
step two: the steam outlet sides of the N guide blades in the step one face upwards, the guide blades are sequentially arranged on a special tool for installing and welding the baffle static blade grids, and after the sizes of the baffle static blade grids formed by the arranged guide blades are checked to be correct, a pressing ring is covered to compress the baffle static blade grids;
step three: tightening one side of the baffle stationary blade grid consisting of the guide blades in the second step by using bolts, and respectively marking the positions for welding groove processing on the inner peripheral belt and the outer peripheral belt of two adjacent guide blades in the baffle stationary blade grid;
step four: performing spot welding fixing on the inner peripheral belt and the outer peripheral belt of two adjacent guide vanes in the third step by adopting a manual argon tungsten-arc welding self-melting mode, and avoiding the position of a welding groove marked in the third step during spot welding;
step five: welding and reinforcing the baffle stationary blade grids fixed by spot welding in the fourth step by adopting manual shielded metal arc welding;
step six: mounting and clamping the baffle stationary blade cascade welded and reinforced in the fifth step and a mounting and welding tool on a working chuck of a vertical lathe, and respectively processing two welding bevels on an inner surrounding belt and an outer surrounding belt of the baffle stationary blade cascade;
step seven: preheating the clapboard static blade grids processed with the welding grooves in the sixth step;
step eight: welding and fixing the baffle stationary blade grids subjected to the preheating treatment in the seventh step along the welding grooves on the inner peripheral belt and the outer peripheral belt respectively;
step nine: and D, performing stress relief treatment on the fixed blade cascade of the partition after the welding groove is welded and fixed in the step eight, and completing the semi-circle welding process of the blade cascade of the partition after the stress relief treatment.
2. The method for assembling and welding the cascade half-ring of the self-shrouded diaphragm of the steam turbine according to claim 1, wherein: and in the sixth step, two welding grooves are respectively processed on the inner peripheral belt and the peripheral belt of the baffle static blade grid, the distance between each welding groove on the inner peripheral belt of the baffle static blade grid and the turned finish machining surface is 10mm, and the distance between each welding groove on the peripheral belt of the baffle static blade grid and the turned finish machining surface is 10 mm.
3. The method for assembling and welding the cascade half-ring of the self-shrouded diaphragm of the steam turbine according to claim 2, wherein: and in the sixth step, the width of the welding groove in the inner surrounding belt of the clapboard stator blade grid is 10 mm.
4. The method for assembling and welding the cascade half-ring of the self-shrouded diaphragm of the steam turbine according to claim 3, wherein: and in the sixth step, the width of the welding groove in the peripheral belt of the clapboard stator blade grid is 10 mm.
5. The method for assembling and welding the cascade half-ring of the self-shrouded diaphragm of the steam turbine according to claim 4, wherein: and in the sixth step, the depth of the welding groove on the inner peripheral belt of the baffle static blade grid is 5 mm.
6. The method for assembling and welding the cascade half-ring of the self-shrouded diaphragm of the steam turbine according to claim 5, wherein: and in the sixth step, the depth of the welding groove on the peripheral belt of the baffle static cascade is 5 mm.
7. The method for assembling and welding the cascade half-ring of the self-shrouded diaphragm of the steam turbine according to claim 6, wherein: and in the sixth step, the angle of the welding bevel on the inner peripheral belt of the clapboard static blade grid is 10 degrees.
8. The method for assembling and welding the cascade half-ring of the self-shrouded diaphragm of the steam turbine according to claim 6, wherein: and in the sixth step, the welding bevel angle on the peripheral belt of the clapboard static blade grid is 10 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010291755.7A CN111545873A (en) | 2020-04-14 | 2020-04-14 | Method for assembling and welding half-ring of blade grid of self-shrouded diaphragm of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010291755.7A CN111545873A (en) | 2020-04-14 | 2020-04-14 | Method for assembling and welding half-ring of blade grid of self-shrouded diaphragm of steam turbine |
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| CN111545873A true CN111545873A (en) | 2020-08-18 |
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| CN202010291755.7A Withdrawn CN111545873A (en) | 2020-04-14 | 2020-04-14 | Method for assembling and welding half-ring of blade grid of self-shrouded diaphragm of steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542213A (en) * | 2022-03-09 | 2022-05-27 | 中国船舶重工集团公司第七0三研究所 | Marine steam turbine partition plate structure |
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| US6084196A (en) * | 1998-02-25 | 2000-07-04 | General Electric Company | Elevated-temperature, plasma-transferred arc welding of nickel-base superalloy articles |
| CN2675867Y (en) * | 2003-09-29 | 2005-02-02 | 上海汽轮机有限公司 | Stationary integral blade separator of impulse steam turbine |
| JP2009255172A (en) * | 2008-03-26 | 2009-11-05 | Ebara Corp | Method for manufacturing t-type joint |
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| CN105081532A (en) * | 2015-09-25 | 2015-11-25 | 东方电气集团东方汽轮机有限公司 | Welding method for brushed distribution type partition plate blade grids of steam turbine |
| CN105364417A (en) * | 2015-12-01 | 2016-03-02 | 哈尔滨汽轮机厂有限责任公司 | Machining method for steam turbine partition plate expansion tank |
| CN108907491A (en) * | 2018-06-20 | 2018-11-30 | 安徽电力股份有限公司淮南田家庵发电厂 | A kind of Steam Turbine blade welding structure and its processing method |
-
2020
- 2020-04-14 CN CN202010291755.7A patent/CN111545873A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6084196A (en) * | 1998-02-25 | 2000-07-04 | General Electric Company | Elevated-temperature, plasma-transferred arc welding of nickel-base superalloy articles |
| CN2675867Y (en) * | 2003-09-29 | 2005-02-02 | 上海汽轮机有限公司 | Stationary integral blade separator of impulse steam turbine |
| JP2009255172A (en) * | 2008-03-26 | 2009-11-05 | Ebara Corp | Method for manufacturing t-type joint |
| CN102935545A (en) * | 2012-11-14 | 2013-02-20 | 哈尔滨汽轮机厂有限责任公司 | Narrow-gap metal active gas (MAG) welding method for large-thickness shroud type diaphragms of turbines |
| CN105081532A (en) * | 2015-09-25 | 2015-11-25 | 东方电气集团东方汽轮机有限公司 | Welding method for brushed distribution type partition plate blade grids of steam turbine |
| CN105364417A (en) * | 2015-12-01 | 2016-03-02 | 哈尔滨汽轮机厂有限责任公司 | Machining method for steam turbine partition plate expansion tank |
| CN108907491A (en) * | 2018-06-20 | 2018-11-30 | 安徽电力股份有限公司淮南田家庵发电厂 | A kind of Steam Turbine blade welding structure and its processing method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542213A (en) * | 2022-03-09 | 2022-05-27 | 中国船舶重工集团公司第七0三研究所 | Marine steam turbine partition plate structure |
| CN114542213B (en) * | 2022-03-09 | 2023-12-01 | 中国船舶重工集团公司第七0三研究所 | Marine steam turbine baffle structure |
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Application publication date: 20200818 |
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