CN101254566A - Real turbine rotary wheel rich argon mixture gas subsection welding method - Google Patents
Real turbine rotary wheel rich argon mixture gas subsection welding method Download PDFInfo
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- CN101254566A CN101254566A CNA2008100643532A CN200810064353A CN101254566A CN 101254566 A CN101254566 A CN 101254566A CN A2008100643532 A CNA2008100643532 A CN A2008100643532A CN 200810064353 A CN200810064353 A CN 200810064353A CN 101254566 A CN101254566 A CN 101254566A
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Abstract
The invention relates to a novel section welding process by using Ar-rich mixed gas for the runners of a real machine, which can effectively achieve re-control of stress field of the runners of a real machine by changing original welding sequence and direction, sequence of welding layers and control of sections and section length to reduce the stress of connection welding seams of water inlet edge and outlet edge of a blade, a upper crown and a lower ring and hazardous areas adjacent thereto or even to change the tensile stress into compressive stress, thus controlling crack of the runners and improving the service life of a set. The result has very high application value on the engineering and far-reaching social significance.
Description
Technical field:
The present invention relates to a kind of real turbine rotary wheel rich argon mixture gas subsection welding method.
Background technology:
The runner problem that ftractures has again and again become the key issue that solution is badly in need of in the power station, cause the great attention of each side, researcher both domestic and external has carried out a large amount of research to this, and the method that some solve runner crackles proposed, wedge is installed as the welding bead hammering of multi-pass welding, at girth joint middle part down, increases stiffener in girth joint outside down, is burn-on earlier in the upper and lower end parts of ring down and load onto dummy shaft etc. at the crown place before taking piece and weldering.In addition, the weld preheating of runner, reasonably the hydrogen that disappears of welding conditions, welding process is handled and postwelding destressing heat treatment, though play a role, all fails fundamentally to solve the crack problem of runner bucket.Analysis-by-synthesis is thought: cause the reason of runner cracking a lot, but wherein the most chief reason be that stress is too high.Stress in the runner running comprises working stress and welding residual stress, working stress is determined by the actual motion industrial and mineral and the rotaring wheel structure of runner, being what be difficult to change, so can reduce welding residual stress effectively, is the control runner effective measures the most that ftracture.As shown in Figure 1, rotaring wheel structure mainly comprises: crown, following ring and blade three parts, for many years, runner cracking position presents certain rules, and most crackles appear at into the water limit and go out waterside and crown and the attachment weld that encircles down and apart from the about 20～30mm of the weld seam zone.As shown in Figure 2, when adopting former technology to weld, the remaining high tensile stress of blade postwelding appears at weld seam and near zone thereof, and has occurred peak value on blade water inlet limit with the melt run and the near zone that go out the waterside, makes this zone become the dangerous position that easily splits.Reducing this regional stress level effectively is the key that solves runner cracking problem.
Summary of the invention:
The purpose of this method is the runner that the solves long-term puzzlement power station problem that ftractures again and again, reduces the welding vestige stress peak value of blade deathtrap, even reaches pressuring stress level, thus the efficient and the service life of improving water turbine units.
The objective of the invention is to realize by following welding procedure scheme: 1 runner diameter is in 3000～7000mm;
2 weldering section orders: take the segmentation welding, weld out earlier waterside (1), water inlet limit (4) and crown attachment weld (1), weld seam (2) weld seam (3) weld seam (4) of ring down, back weldering interlude (5), runner goes out waterside (1) segment length and is controlled at 70～180mm, and water inlet limit (4) segment length is controlled at 100～200mm; 3 welding directions: the weldering section starting the arc that welding direction is selected blade outlet in conjunction with actual industrial and mineral is in the water side (1) of blade, and the weldering section starting the arc on blade water inlet limit is in the water inlet end (4) of blade; The starting the arc of weldering section is in the end near blade water inlet limit (4) in the middle of the blade;
4 blade fillets: the knuckle of blade water side and water inlet end is all finished before the weldering of weldering section in the middle of carrying out blade;
1) welding method: adopt rich argon gas CO
2Mixed gas arc welding, protective gas are 95%Ar+5%CO
22) welding conditions: welding current is that 200～260A, weldingvoltage are that 22～32V, interlayer temperature are not higher than 100 ℃～120 ℃ of 150 ℃, preheat temperature, preheating can be according to actual conditions, adopt the method for coal gas heating or the heating of crawler type electric heater, weld width is not more than 15mm; 3) symmetrical welding: in welding process, the adjacent leaf position of welding successively in front should keep the symmetric relation on the circumference as far as possible; 4) layer order: in the welding process, the principle that the welding sequence of runner welded seam area layer adopts even weld to fill reduces the angular deformation of runner postwelding as far as possible; 5) weldering section order: the segmentation welding, elder generation weldering two ends, in the middle of the weldering of back, the segment length is according to the difference of different set structures and dimensions, by calculating; 6) welding direction: the weldering section starting the arc that welding direction is selected blade outlet as far as possible in conjunction with actual industrial and mineral is in the water side of blade, and the weldering section starting the arc on blade water inlet limit is in the water inlet end of blade; The starting the arc of weldering section is in the end near blade water inlet limit in the middle of the blade; 7) blade fillet: the knuckle of blade water side and water inlet end is all finished before the weldering of weldering section in the middle of carrying out blade; 8) blow-out mode:, adopt the mode of decay blow-out in order to reduce or to avoid crater crack as far as possible; 9) flaw detection: flaw detection mainly is divided into two stages, and the one, after finishing, two sections weldering sections carry out at once, to guarantee the welding quality of this part; The 2nd, after welding is finished, centre weldering section is carried out dye penetrant inspection.
The present invention is by changing original welding sequence and direction, layer order and segmentation and segment length's control, can realize regulation and control again to runner Stress Field Distribution state, thereby with blade intake the limit, go out waterside and crown and the attachment weld of ring and the stress drop of adjacent deathtrap thereof get off down, even change tension into compression, thereby reach the purpose of control runner cracking, the service life of improving unit.New welding technique of the present invention is applied in many products, and the stress level of blade deathtrap is reduced significantly, and the stress level of whole runner has obtained good control, has reached Expected Results.
Description of drawings:
Fig. 1 is whole rotaring wheel structure figure
Fig. 2 is former technology welding sequence and direction
Fig. 3 segmentation new technology welding sequence, direction and segment length's schematic diagram
Fig. 4 is the number-of-fragments schematic diagram of blade weld seam
The specific embodiment:
The present invention is a kind of real turbine rotary wheel rich argon mixture gas subsection welding method: 1 runner diameter is in 3000～7000mm;
2 weldering section orders: as shown in Figure 3, take the segmentation welding, weld out earlier waterside 1, water inlet limit 4 and crown attachment weld 1, weld seam 2 weld seams 3 weld seams 4 of ring down, back weldering interlude 5, runner goes out the waterside segment length and is controlled at 70～180mm, and water inlet limit segment length is controlled at 100～200mm; 3 welding directions: the weldering section starting the arc that welding direction is selected blade outlet in conjunction with actual industrial and mineral is in the water side (1) of blade, and the weldering section starting the arc on blade water inlet limit is in the water inlet end (4) of blade; The starting the arc of weldering section is in the end near blade water inlet limit (4) in the middle of the blade;
4 blade fillets: the knuckle of blade water side and water inlet end is all finished before the weldering of weldering section in the middle of carrying out blade;
5 welding methods: 1) adopt rich argon gas CO
2Mixed gas arc welding, protective gas are 95%Ar+5%CO
22) welding conditions: welding current is that 200～260A, weldingvoltage are that 22～32V, interlayer temperature are not higher than 100 ℃～120 ℃ of 150 ℃, preheat temperature, preheating can be according to actual conditions, adopt the method for coal gas heating or the heating of crawler type electric heater, weld width is not more than 15mm; 3) symmetrical welding: in welding process, the adjacent leaf position of welding successively in front should keep the symmetric relation on the circumference as far as possible; 4) layer order: in the welding process, the principle that the welding sequence of runner welded seam area layer adopts even weld to fill reduces the angular deformation of runner postwelding as far as possible; 5) weldering section order: the segmentation welding, elder generation weldering two ends, in the middle of the weldering of back, the segment length is according to the difference of different set structures and dimensions, by calculating; 6) welding direction: the weldering section starting the arc that welding direction is selected blade outlet as far as possible in conjunction with actual industrial and mineral is in the water side of blade, and the weldering section starting the arc on blade water inlet limit is in the water inlet end of blade; The starting the arc of weldering section is in the end near blade water inlet limit in the middle of the blade; 7) blade fillet: the knuckle of blade water side and water inlet end is all finished before the weldering of weldering section in the middle of carrying out blade; 8) blow-out mode:, adopt the mode of decay blow-out in order to reduce or to avoid crater crack as far as possible; 9) flaw detection: flaw detection mainly is divided into two stages, and the one, after finishing, two sections weldering sections carry out at once, to guarantee the welding quality of this part; The 2nd, after welding is finished, centre weldering section is carried out dye penetrant inspection.
The prototype runner mainly comprises: crown 6, encircle 7 and some curved surface buckets 8 that is connected crown and following interannular down, as shown in Figure 1.Runner high-pressure side (current radial inflow) is blade water inlet limit, and runner low-pressure side (current axially flow out) is a blade outlet.
As shown in Figure 4, wherein CF represents the front of crown, and CB represents the back side of crown, and BF represents the front of ring down, and BB represents the back side of ring down.For example BB-1-2-1 represent to the vacuum side of blade of blade 1 and down the weld seam between the ring weld, wherein the welding position is the 1st layer of blade water inlet side weld section 2; CI-1-4 represents the knuckle on blade water inlet limit between crown and the blade is welded.
As shown in Figure 4, because in the multilayer welding of runner, every layer welding scheme is the same, therefore only provided the welding scheme of weld seam ground floor here.Detailed process: the 1) attachment weld of crown working face and blade welding; 2) back root cleaning, polishing, PT flaw detection, the qualified back welding of detecting a flaw; 3) blade and following ring attachment weld; 4) stand up; 5) blade and following girth joint back root cleaning, PT qualified back welding; 6) UT of pilot process visits, and front, qualified back is filled up and round-corner transition; 7) stand up; 8) blade crown positive back side welding, round-corner transition, following ring and the welding of vacuum side of blade weld seam.
Claims (1)
1, a kind of real turbine rotary wheel rich argon mixture gas subsection welding method is characterized in that:
1 runner diameter is in 3000～7000mm;
2 weldering section orders: take the segmentation welding, weld out earlier waterside (1), water inlet limit (4) and crown attachment weld (1), weld seam (2) weld seam (3) weld seam (4) of ring down, back weldering interlude (5), runner goes out the waterside segment length and is controlled at 70～180mm, and water inlet limit segment length is controlled at 100～200mm; 3 welding directions: the weldering section starting the arc that welding direction is selected blade outlet in conjunction with actual industrial and mineral is in the water side (1) of blade, and the weldering section starting the arc on blade water inlet limit is in the water inlet end (4) of blade; The starting the arc of weldering section is in the end near blade water inlet limit (4) in the middle of the blade;
4 blade fillets: the knuckle of blade water side and water inlet end is all finished before the weldering of weldering section in the middle of carrying out blade;
5 welding methods: 1) adopt rich argon gas CO
2Mixed gas arc welding, protective gas are 95%Ar+5%CO
22) welding conditions: welding current is that 200～260A, weldingvoltage are that 22～32V, interlayer temperature are not higher than 100 ℃～120 ℃ of 150 ℃, preheat temperature, preheating can be according to actual conditions, adopt the method for coal gas heating or the heating of crawler type electric heater, weld width is not more than 15mm; 3) symmetrical welding: in welding process, the adjacent leaf position of welding successively in front should keep the symmetric relation on the circumference as far as possible; 4) layer order: in the welding process, the principle that the welding sequence of runner welded seam area layer adopts even weld to fill reduces the angular deformation of runner postwelding as far as possible; 5) weldering section order: the segmentation welding, elder generation weldering two ends, in the middle of the weldering of back, the segment length is according to the difference of different set structures and dimensions, by calculating; 6) welding direction: the weldering section starting the arc that welding direction is selected blade outlet as far as possible in conjunction with actual industrial and mineral is in the water side of blade, and the weldering section starting the arc on blade water inlet limit is in the water inlet end of blade; The starting the arc of weldering section is in the end near blade water inlet limit in the middle of the blade; 7) blade fillet: the knuckle of blade water side and water inlet end is all finished before the weldering of weldering section in the middle of carrying out blade; 8) blow-out mode:, adopt the mode of decay blow-out in order to reduce or to avoid crater crack as far as possible; 9) flaw detection: flaw detection mainly is divided into two stages, and the one, after finishing, two sections weldering sections carry out at once, to guarantee the welding quality of this part; The 2nd, after welding is finished, centre weldering section is carried out dye penetrant inspection.
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| CN2008100643532A CN101254566B (en) | 2008-04-23 | 2008-04-23 | Real turbine rotary wheel rich argon mixture gas subsection welding method |
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| CN2008100643532A CN101254566B (en) | 2008-04-23 | 2008-04-23 | Real turbine rotary wheel rich argon mixture gas subsection welding method |
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| CN101254566B CN101254566B (en) | 2010-12-08 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102363258A (en) * | 2011-07-01 | 2012-02-29 | 哈尔滨电机厂有限责任公司 | Technological method for assembling and welding seat ring of water turbine with stainless steel fixed guide blade |
| CN102814573A (en) * | 2012-03-15 | 2012-12-12 | 哈尔滨电机厂有限责任公司 | Local pressure stress method for improving anti-fatigue performance of mixed-flow runner |
| CN103480973A (en) * | 2013-09-22 | 2014-01-01 | 中国东方电气集团有限公司 | Three-stage cold metal transfer welding method for steam turbine hollow static blades |
| CN104439635A (en) * | 2014-11-14 | 2015-03-25 | 句容五星机械制造有限公司 | Agitator blade welding process based on CO2 welding and manual welding |
| CN104625353A (en) * | 2015-01-08 | 2015-05-20 | 哈尔滨电机厂有限责任公司 | Welding technology method for assembling large length-width ratio hollow type fixed guide vane of large-scale hydroturbine |
| JP2016191572A (en) * | 2015-03-31 | 2016-11-10 | 日立造船株式会社 | Ultrasonic inspection device |
| CN106670586A (en) * | 2016-12-30 | 2017-05-17 | 重庆水轮机厂有限责任公司 | Manufacturing method for grooves in medium-small Francis runner blade |
-
2008
- 2008-04-23 CN CN2008100643532A patent/CN101254566B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102363258A (en) * | 2011-07-01 | 2012-02-29 | 哈尔滨电机厂有限责任公司 | Technological method for assembling and welding seat ring of water turbine with stainless steel fixed guide blade |
| CN102363258B (en) * | 2011-07-01 | 2014-08-20 | 哈尔滨电机厂有限责任公司 | Technological method for assembling and welding seat ring of water turbine with stainless steel fixed guide blade |
| CN102814573A (en) * | 2012-03-15 | 2012-12-12 | 哈尔滨电机厂有限责任公司 | Local pressure stress method for improving anti-fatigue performance of mixed-flow runner |
| CN103480973A (en) * | 2013-09-22 | 2014-01-01 | 中国东方电气集团有限公司 | Three-stage cold metal transfer welding method for steam turbine hollow static blades |
| CN103480973B (en) * | 2013-09-22 | 2015-12-09 | 中国东方电气集团有限公司 | A kind of hollow stationary blade of steam turbine cold metal transfer three sections of welding methods |
| CN104439635A (en) * | 2014-11-14 | 2015-03-25 | 句容五星机械制造有限公司 | Agitator blade welding process based on CO2 welding and manual welding |
| CN104625353A (en) * | 2015-01-08 | 2015-05-20 | 哈尔滨电机厂有限责任公司 | Welding technology method for assembling large length-width ratio hollow type fixed guide vane of large-scale hydroturbine |
| JP2016191572A (en) * | 2015-03-31 | 2016-11-10 | 日立造船株式会社 | Ultrasonic inspection device |
| CN106670586A (en) * | 2016-12-30 | 2017-05-17 | 重庆水轮机厂有限责任公司 | Manufacturing method for grooves in medium-small Francis runner blade |
| CN106670586B (en) * | 2016-12-30 | 2018-08-31 | 重庆水轮机厂有限责任公司 | A kind of medium and small Francis Turbine Blade groove production method |
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|---|---|
| CN101254566B (en) | 2010-12-08 |
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Assignee: Harbin Motor Factory AC & DC Motor Co., Ltd. Assignor: Harbin Electric Machine Co., Ltd. Contract record no.: 2011230000211 Denomination of invention: Real turbine rotary wheel rich argon mixture gas subsection welding method Granted publication date: 20101208 License type: Exclusive License Open date: 20080903 Record date: 20110822 |
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Granted publication date: 20101208 Termination date: 20180423 |