CN102935545A - Narrow-gap metal active gas (MAG) welding method for large-thickness shroud type diaphragms of turbines - Google Patents
Narrow-gap metal active gas (MAG) welding method for large-thickness shroud type diaphragms of turbines Download PDFInfo
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- CN102935545A CN102935545A CN2012104575475A CN201210457547A CN102935545A CN 102935545 A CN102935545 A CN 102935545A CN 2012104575475 A CN2012104575475 A CN 2012104575475A CN 201210457547 A CN201210457547 A CN 201210457547A CN 102935545 A CN102935545 A CN 102935545A
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Abstract
The invention relates to a narrow-gap MAG welding method for large-thickness shroud type diaphragms of turbines to solve problems of conventional groove forms of prior turbine diaphragms, low production efficiency of CO2 shielded welding, instable welding quality, and high repair rate and production cost. The method comprises that narrow-gap V-shaped grooves (usually 6 degrees to 8 degrees) are opened on a diaphragm outer ring and a diaphragm body respectively, a main weld joint of a gas outlet side is spot welded, and cross spot welding is performed; a spot welding Z-shaped connection block is assembled on a middle split surface of the diaphragm, and a spot welding lead and an arc blowout plate are assembled on the other side; a main welding joint of a gas inlet side of the diaphragm is spot welded firmly; gas passages of the gas inlet side and the gas outlet side are covered with a layer of asbestos cloth, and a rigid ring is welded; preheating and welding are preformed, and the diaphragm is completed through the MAG welding method; and de-stressing heat treatment is performed after welding. The narrow-gap MAG welding method for large-thickness shroud type diaphragms of turbines is applied in the mechanical welding field.
Description
Technical field
The present invention relates to the narrow gap MAG welding method of large thickness Shround-band type dividing plate, can be widely used in the welding production of the large thickness Shround-band type of steam turbine dividing plate, belong to field of machining.
Background technology
Partition board of steam turbine is the steam turbine strength member, and the Shround-band type dividing plate is very common, and wherein shroud mostly is the materials such as 1Cr13 or 1Cr11MoV, and dividing plate outer shroud and partition body mostly are the materials such as 15Cr1Mo1V, 15CrMoA, ZG20CrMoV or ZG20CrMo.Partition quality is had relatively high expectations, and needs to guarantee the important parameters such as throat opening, larynx height, affects the situation of exerting oneself of steam turbine, so partition quality is by the total quality of direct relation steam turbine.Generally adopted in the past CO
2Gas shielded arc welding is welded, and the welding job amount is large, and efficiency is low.Welding quality is unstable, and repair rate is high, and production cost is high.And, for large thickness diaphragms, if adopt traditional groove type, the groove size will be very large, the contraction after welding and distortion will be larger, are unfavorable for controlling and guaranteeing the important parameters such as larynx height of dividing plate, thereby affect partition quality.
Summary of the invention
The present invention will solve the conventional groove type of existing partition board of steam turbine, CO
2The production efficiency of gas shielded arc welding is low, and welding quality is unstable, the higher and high problem of production cost of repair rate, and the narrow gap MAG welding method of the large thickness Shround-band type of a kind of steam turbine dividing plate provided.
The narrow gap MAG welding method of the large thickness Shround-band type of a kind of steam turbine dividing plate is carried out according to the following steps:
One, dividing plate outer shroud and partition body are opened respectively the dark double V-groove in narrow gap, assemble in diaphragm outer shroud, leaf grating and partition body on mounting plate, and spot welding steam output side main weld then, then intersected spot welding, and carry out scarfing cinder; Wherein, described dividing plate outer shroud and the narrow gap of partition body double V-groove angle are 6～8 °, every long 30～40mm of described spot welding, spot welding one deck during spot welding;
Two, the one side assembling spot welding Z-type contiguous block at dividing plate split place, opposite side assembling spot welding is drawn and arc-extinguishing plate;
Three, by the dividing plate upset, with the order spot welding firm dividing plate steam admission side main weld same with the steam output side main weld;
Four, cover with one deck asbestos cloth advancing the lagging edge steam passage, refill the weldering stiffening ring;
Five, preheating, welding: welding adopts gas metal-arc welding MAG welding, should clear up groove and near dirt before welding;
Six, after completing welding, carry out destressing heat treatment, completed the narrow gap MAG welding to the large thickness Shround-band type of steam turbine dividing plate.
The invention effect:
Adopt narrow gap MAG welding method for large thickness Shround-band type dividing plate, with traditional manual welding and CO
2Gas-shield welding method is compared, and obvious advantage is arranged.Adopt Narrow sloping-glot, can reduce the groove size of dividing plate outer shroud and partition body, reduce the welding job amount, thereby increase work efficiency, shorten the welding equipment time at least 50%, also saved a large amount of wldings simultaneously; Owing to adopting narrow gap, weld metal zone dwindles, and the contraction of postwelding is a lot of with distortion also relative minimizing, is conducive to control and guarantee the significant dimensions such as pitch diameter and throat opening; Adopt the MAG welding method, can improve the metal deposition efficiency, not only enhance productivity, can also guarantee welding quality.
The accompanying drawing explanation
Fig. 1 is the welding precedence diagram of the narrow gap MAG welding of large thickness Shround-band type dividing plate in test 1; Wherein, I is a dividing plate outer shroud, and II is partition body, and wherein, numeral 1～14 represents the welding order.
The specific embodiment
The specific embodiment one: the narrow gap MAG welding method of the large thickness Shround-band type of a kind of steam turbine dividing plate of present embodiment is carried out according to the following steps:
One, dividing plate outer shroud and partition body are opened respectively dark narrow gap double V-groove, assemble in diaphragm outer shroud, leaf grating and partition body on mounting plate, and spot welding steam output side main weld then, then intersected spot welding, and carry out scarfing cinder; Wherein, described dividing plate outer shroud and the narrow gap of partition body double V-groove angle are 6～8 °, every long 30～40mm of described spot welding, spot welding one deck during spot welding;
Two, the one side assembling spot welding Z-type contiguous block at dividing plate split place, opposite side assembling spot welding is drawn and arc-extinguishing plate;
Three, by the dividing plate upset, with the order spot welding firm dividing plate steam admission side main weld same with the steam output side main weld;
Four, cover with one deck asbestos cloth advancing the lagging edge steam passage, refill the weldering stiffening ring;
Five, preheating, welding: welding adopts gas metal-arc welding MAG welding, should clear up groove and near dirt before welding;
Six, after completing welding, carry out destressing heat treatment, completed the narrow gap MAG welding to the large thickness Shround-band type of steam turbine dividing plate.
The present embodiment effect:
Adopt narrow gap MAG welding method for large thickness Shround-band type dividing plate, with traditional manual welding and CO
2Gas-shield welding method is compared, and obvious advantage is arranged.Adopt Narrow sloping-glot, can reduce the groove size of dividing plate outer shroud and partition body, reduce the welding job amount, thereby increase work efficiency, shorten the welding equipment time at least 50%, also saved a large amount of wldings simultaneously; Owing to adopting narrow gap, weld metal zone dwindles, and the contraction of postwelding is a lot of with distortion also relative minimizing, is conducive to control and guarantee the significant dimensions such as pitch diameter and throat opening; Adopt the MAG welding method, can improve the metal deposition efficiency, not only enhance productivity, can also guarantee welding quality.
The specific embodiment two: present embodiment is different from the specific embodiment one: step 1 mid point postwelding guarantees that the pitch diameter error range is in Φ ± 0.75mm, and the throat opening error range is in ± 0.25mm.Other step and parameter are identical with the specific embodiment one.
By following verification experimental verification beneficial effect of the present invention:
One, assemble in diaphragm outer shroud, leaf grating and partition body on mounting plate, the narrow gap of dividing plate outer shroud and partition body double V-groove angle is 6～8 °, spot welding steam output side main weld then, then intersected spot welding, and carry out scarfing cinder; Every long 30～40mm of wherein said spot welding, spot welding one deck during spot welding;
Two, the one side assembling spot welding Z-type contiguous block at dividing plate split place, opposite side assembling spot welding is drawn and arc-extinguishing plate;
Three, by the dividing plate upset, with the order spot welding firm dividing plate steam admission side main weld same with the steam output side main weld;
Four, cover with one deck asbestos cloth advancing the lagging edge steam passage, refill the weldering stiffening ring;
Five, preheating, welding: welding employing gas metal-arc welding MAG welding, welding welding order is carried out according to Fig. 1 order, should clear up groove and near dirt before welding;
Six, after completing welding, carry out destressing heat treatment, completed the narrow gap MAG welding to the large thickness Shround-band type of steam turbine dividing plate;
Welding sequence in this test is as shone as shown in Fig. 1; Wherein, numeral 1～14 represents the welding order, and I is a dividing plate outer shroud, and II is partition body;
One-sided groove depth >=the 55mm of this test median septum;
It is 0.5mm that test products postwelding pitch diameter reaches with the design load maximum deviation, and throat opening and design load maximum deviation reach 0.2mm;
The narrow gap MAG solder technology of the large thickness Shround-band type dividing plate that this test adopts, can really accomplish to stablize, efficiently, high quality of production, be a kind of advanced technology of promoting in the large thickness Shround-band type of steam turbine dividing plate that is worth.
Adopt Narrow sloping-glot, can reduce the groove size of dividing plate outer shroud and partition body, reduce the welding job amount, thereby increase work efficiency, shorten the welding equipment time at least 50%, also saved a large amount of wldings simultaneously; Owing to adopting narrow gap, weld metal zone dwindles, and the contraction of postwelding is a lot of with distortion also relative minimizing, is conducive to control and guarantee the significant dimensions such as pitch diameter and throat opening; Adopt the MAG solder technology, can improve the metal deposition efficiency, not only enhance productivity, can also guarantee welding quality.
Claims (2)
1. the narrow gap MAG welding method of the large thickness Shround-band type of a steam turbine dividing plate is characterized in that the narrow gap MAG welding method of the large thickness Shround-band type of steam turbine dividing plate is carried out according to the following steps:
One, dividing plate outer shroud and partition body are opened respectively narrow gap double V-groove, assemble in diaphragm outer shroud, leaf grating and partition body on mounting plate, and spot welding steam output side main weld then, then intersected spot welding, and carry out scarfing cinder; Wherein, described dividing plate outer shroud and the narrow gap of partition body double V-groove angle are 6～8 °, every long 30～40mm of described spot welding, spot welding one deck during spot welding;
Two, the one side assembling spot welding Z-type contiguous block at dividing plate split place, opposite side assembling spot welding is drawn and arc-extinguishing plate;
Three, by the dividing plate upset, with the order spot welding firm dividing plate steam admission side main weld same with the steam output side main weld;
Four, cover with one deck asbestos cloth advancing the lagging edge steam passage, refill the weldering stiffening ring;
Five, preheating, welding: welding adopts gas metal-arc welding MAG welding, should clear up groove and near dirt before welding;
Six, after completing welding, carry out destressing heat treatment, completed the narrow gap MAG welding to the large thickness Shround-band type of steam turbine dividing plate.
2. the narrow gap MAG welding method of the large thickness Shround-band type of a kind of steam turbine according to claim 1 dividing plate, is characterized in that step 1 mid point postwelding guarantees that the pitch diameter error range is in Φ ± 0.75mm, and the throat opening error range is in ± 0.2mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104439637A (en) * | 2014-11-17 | 2015-03-25 | 句容五星机械制造有限公司 | CO2 welding process of mixer blades |
| 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 |
| CN106475666A (en) * | 2016-11-17 | 2017-03-08 | 中国华冶科工集团有限公司 | Pipeline narrow gap vertical downward TIG weld method |
| CN111545873A (en) * | 2020-04-14 | 2020-08-18 | 哈尔滨汽轮机厂有限责任公司 | Method for assembling and welding half-ring of blade grid of self-shrouded diaphragm of steam turbine |
| US11148235B2 (en) | 2018-01-30 | 2021-10-19 | General Electric Company | Repair of gas turbine diaphragm |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5653879A (en) * | 1979-10-09 | 1981-05-13 | Kubota Ltd | Automatic penetration beand welding method to narrow groove |
| JPH11267830A (en) * | 1998-03-23 | 1999-10-05 | Toshiba Corp | On the spot welding method of hydraulic equipment |
| CN1579694A (en) * | 2004-05-19 | 2005-02-16 | 哈尔滨汽轮机厂有限责任公司 | Steam turbine bulkhead electron-beam welding method |
| JP2007278064A (en) * | 2006-04-03 | 2007-10-25 | Hitachi Ltd | Steam turbine welded rotor and method of manufacturing it, and steam turbine and power generating plant using it |
| CN102319351A (en) * | 2011-09-22 | 2012-01-18 | 王璐 | Blood enriching and qi replenishing health-care product |
-
2012
- 2012-11-14 CN CN2012104575475A patent/CN102935545A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5653879A (en) * | 1979-10-09 | 1981-05-13 | Kubota Ltd | Automatic penetration beand welding method to narrow groove |
| JPH11267830A (en) * | 1998-03-23 | 1999-10-05 | Toshiba Corp | On the spot welding method of hydraulic equipment |
| CN1579694A (en) * | 2004-05-19 | 2005-02-16 | 哈尔滨汽轮机厂有限责任公司 | Steam turbine bulkhead electron-beam welding method |
| JP2007278064A (en) * | 2006-04-03 | 2007-10-25 | Hitachi Ltd | Steam turbine welded rotor and method of manufacturing it, and steam turbine and power generating plant using it |
| CN102319351A (en) * | 2011-09-22 | 2012-01-18 | 王璐 | Blood enriching and qi replenishing health-care product |
Non-Patent Citations (2)
| Title |
|---|
| 周爱民: "汽轮机隔板焊接工艺的改进", 《焊接技术》 * |
| 王广成等: "窄间隙焊接技术在隔板中的应用", 《中国新技术新产品》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104439637A (en) * | 2014-11-17 | 2015-03-25 | 句容五星机械制造有限公司 | CO2 welding process of mixer blades |
| 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 |
| CN106475666A (en) * | 2016-11-17 | 2017-03-08 | 中国华冶科工集团有限公司 | Pipeline narrow gap vertical downward TIG weld method |
| US11148235B2 (en) | 2018-01-30 | 2021-10-19 | General Electric Company | Repair of gas turbine diaphragm |
| US11813708B2 (en) | 2018-01-30 | 2023-11-14 | General Electric Company | Repair of gas turbine diaphragm |
| CN111545873A (en) * | 2020-04-14 | 2020-08-18 | 哈尔滨汽轮机厂有限责任公司 | Method for assembling and welding half-ring of blade grid of self-shrouded diaphragm of steam turbine |
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Application publication date: 20130220 |