CN100434226C - Bulb through-flow units radial type rotor support rack welding deformation controlling means - Google Patents
Bulb through-flow units radial type rotor support rack welding deformation controlling means Download PDFInfo
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- CN100434226C CN100434226C CNB2006100219156A CN200610021915A CN100434226C CN 100434226 C CN100434226 C CN 100434226C CN B2006100219156 A CNB2006100219156 A CN B2006100219156A CN 200610021915 A CN200610021915 A CN 200610021915A CN 100434226 C CN100434226 C CN 100434226C
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Abstract
The invention relates to a lamp through-flow machine radial rotator support welding deformation control method. Wherein, it designs the welding technique to control the welding deformation.
Description
Technical field
The present invention relates to a kind of welding procedure of radial type rotor support rack of scaled bulb tubular generator unit.
Background technology
The bulb tubular turbine's rotor support is the core component of scaled bulb tubular generator amature, the rotor field spider of scaled bulb tubular generator unit is the radiant type structure, complex structure is huge, rigidity is strong, stressed complexity, the leg size is big, the yoke ring thickness of slab, existing bulb through-flow units radial type rotor support rack welding method adopts general welding procedure, stress is difficult for discharging in the welding process, cause welding deformation excessive, subsequent handling can't be carried out, and the also suitable difficulty of the rectification of welding deformation maybe can't be corrected and rotor field spider is scrapped.Main welding deformation is that angle welding is vertically shunk the flexural deformation that causes, the braking ring flat-plate that the angle welding cross-direction shrinkage is drawn and the angular deformation of lower ring plate, and the torsional deformation that causes because welding sequence is improper.
Summary of the invention
The invention provides a kind of bulb through-flow units radial type rotor support rack welding deformation controlling means, at the physics of bulb tubular turbine's rotor support and the deficiency of mechanical property and existing welding method, main welding deformation is carried out emphasis control, solved the difficult problem of the easy welding deformation of bulb tubular turbine's rotor support.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A. thoroughly remove the impurity that comprises oxide skin and iron rust in the 50mm scope of groove both sides, the polishing light digs the weld seam of spot welding, polishes smooth;
B. at weld seam and preheat with ceramic heating flake in the 20mm scope on every side, preheat temperature is 100～150 ℃;
C. layering welding, every weldering finishes one deck, weld one deck down again after thoroughly knowing welding slag, during to every layer of weld seam welding, the weld seam long at circumferencial direction carries out segmentation, positive and negative alternate is symmetrically welded weld seam, and welding sequence is welded seam front → with carbon arc gas back chipping → polishing groove → welded seam reverse side → welded seam front;
D. except that ground floor and last one deck, every welding one deck reduces welding stress with the air pressure gun method for oscillating, and vibration temperature is more than 100～150 ℃ or 400 ℃;
E. after the rotor field spider welding is finished, hang in whole removing stress annealing in the annealing furnace immediately.
The solder technology that the present invention adopts is the argon-rich mixed gas weldering, Ar and CO in the rich argon mixture gas
2Part by weight be 8: 2, the value of Ar is 20～24L/min, CO
2Value be 5～6L/min, welding current is 180～260A, arc voltage is 26～32V, speed of welding is 40～60cm/min, wire feed rate 5～10m/min.
The technological parameter of annealing in process is, charging temperature≤200 ℃, programming rate: be 80～100 ℃/h before 400 ℃, after 400 ℃ is≤20 ℃/h, holding temperature is 600 ℃～650 ℃, and temperature retention time is 5 hours, cooling velocity: be≤24 ℃/h on 400 ℃, be≤120 ℃/h under 400 ℃, tapping temperature is≤150 ℃.
Circumferencial direction at rotor field spider evenly is provided with 12 technology triangle reinforcements, group welding piece that flaw detection is qualified and upstream and downstream side are braked ring flat-plate, gone up the lower ring plate assembly welding is rotor field spider, rotor field spider is carried out stress annealing handle polishing welding seams, technology triangle reinforcement is removed in flaw detection then.
The interlayer temperature is not less than preheat temperature in the layering welding process, is not higher than 30 ℃ of preheat temperatures.
The mentality of designing of welding step is because the easy dilatation of weld seam of elder generation's weldering, so big weld seam of first welding contracted quantity, make the weld seam can free shrink, the weld seam of stressed maximum in the welded disc turbine rotor support again, the weld seam that links to each other with yoke ring such as the centerbody of soldering group weldment.Adopting thickness of slab is the ring muscle of 60mm, assembly welding centerbody and ring muscle, and postwelding processing makes that the thickness of slab of ring muscle is 50mm, cuts the mounting hole of ring muscle, and the polishing scarfing can be avoided because welding capacity is big like this to smooth, and the deflection that causes encircling muscle is big, and weldment can't be smoothed.Because behind centerbody and the ring muscle assembly welding, forms stronger rigidity, in case welding, stress can not get discharging, and can form crackle, so open the welding stress liberation port of 4 symmetries at the ring web plate excircle, the assurance peripheral weld can effectively reduce welding stress.For the twin fillet wolt welding capacity of avoiding upstream and downstream side braking ring flat-plate to link to each other with yoke ring big, and there is not the technology lacing wire to rigidly fix, cause welding deformation, so the circumferencial direction at upstream and downstream side braking ring flat-plate evenly is provided with 12 technology triangle reinforcements, the pressure weldment can not free shrink when welding.
At weld seam and to carry out pre-warmed reason with ceramic heating flake in the 20mm scope on every side be for reducing welding temperature and chilling temperature, because welding temperature and chilling temperature are big more, residual stress is just big more.
Cracking resistance is good because rich argon mixture gas has, deposited metal plasticity is good, welding stress and welding deformation are little, and the advantage that is suitable for all-position welding, thus select for use rich argon mixture gas as protection weldering gas, and definite rich argon mixture gas Ar and CO
2Ratio be 8: 2, the value of Ar is 20～24L/min, CO
2Value be 5～6L/min, welding current is 180～260A, arc voltage is 26～32V, speed of welding is 40～60cm/min, wire feed rate 5～10m/min.
The technological parameter of annealing in process is, charging temperature≤200 ℃, programming rate: be 80～100 ℃/h before 400 ℃, after 400 ℃ is≤20 ℃/h, holding temperature is 600 ℃～650 ℃, and temperature retention time is 5 hours, cooling velocity: be≤24 ℃/h on 400 ℃, be≤120 ℃/h under 400 ℃, tapping temperature is≤150 ℃.
The invention has the advantages that step by well-designed deformation control method, and concrete welding operation technology, take all factors into consideration the physics and the mechanical property of bulb tubular turbine's rotor support, main welding deformation is carried out emphasis control, overcome the deficiency of existing welding method, safely, effectively, solve the difficult problem of the easy welding deformation of bulb tubular turbine's rotor support at low cost, had very strong practicality.
The specific embodiment
Bulb through-flow units radial type rotor support rack welding deformation controlling means comprises following welding deformation control step:
A. select rich argon mixture gas as protection weldering gas;
B. adopting thickness of slab is the ring muscle of 60mm, assembly welding centerbody and ring muscle, postwelding processing makes that the thickness of slab of ring muscle is 50mm, cut the mounting hole of ring muscle, the polishing scarfing forms a group welding piece m this moment to smooth, group welding piece m is carried out stress annealing to be handled, polishing welding seams is detected a flaw, and opens the welding stress liberation port of 4 symmetries at the ring web plate excircle;
C. yoke ring is carried out annealing in process, removed the technology lacing wire after coming out of the stove 24 hours, check comprehensively whether size is up to specification, weld the weld seam that yoke ring up to specification links to each other with big small gusset, the weld seam that links to each other with yoke ring of the centerbody of the qualified group welding piece m of welding flaw detection again, making it assembly welding is a group welding piece n, and group welding piece n is carried out the stress annealing processing, polishing welding seams, flaw detection;
D. the circumferencial direction at upstream and downstream side braking ring flat-plate evenly is provided with 12 technology triangle reinforcements, group welding piece n that flaw detection is qualified and upstream and downstream side are braked ring flat-plate, gone up the lower ring plate assembly welding is rotor field spider, rotor field spider is carried out stress annealing to be handled, polishing welding seams, technology triangle reinforcement is removed in flaw detection then;
Welding operation may further comprise the steps:
A. thoroughly remove the impurity that comprises oxide skin and iron rust in the 50mm scope of groove both sides, the polishing light digs the weld seam of spot welding, polishes smooth;
B. at weld seam and preheat with ceramic heating flake in the 20mm scope on every side, preheat temperature is 150 ℃;
C. butt welded seam carries out the ground floor welding, to carrying out segmentation at the long weld seam of circumferencial direction, positive and negative alternate is symmetrically welded weld seam, and welding sequence is: the welded seam front, with carbon arc gas back chipping, the polishing groove, the welded seam reverse side, welded seam front, air pressure gun vibration during welding, during vibration, temperature is 100～150 ℃;
D. remove weld seam impurity on every side, butt welded seam carries out the multilayer welding, and each layer keeps interlayer temperature, low 160 ℃ of interlayer temperatures;
Determine Ar and CO
2Ratio be 8: 2, the value of Ar is 20L/min, CO
2Value be 5L/min, welding current is 220A, arc voltage is 30V, speed of welding is 50cm/min, wire feed rate 8m/min.
The technological parameter of annealing in process is, charging temperature≤200 ℃, programming rate: be 80～100 ℃/h before 400 ℃, after 400 ℃ is≤20 ℃/h, holding temperature is 600 ℃～650 ℃, and temperature retention time is 5 hours, cooling velocity: be≤24 ℃/h on 400 ℃, be≤120 ℃/h under 400 ℃, tapping temperature is≤150 ℃.
Claims (4)
1, bulb through-flow units radial type rotor support rack welding deformation controlling means is characterized in that it may further comprise the steps:
A. thoroughly remove the impurity that comprises oxide skin and iron rust in the 50mm scope of groove both sides, the polishing light digs the weld seam of spot welding, polishes smooth;
B. at weld seam and preheat with ceramic heating flake in the 20mm scope on every side, preheat temperature is 100～150 ℃;
C. layering welding, every weldering finishes one deck, weld one deck down again after thoroughly removing welding slag, during to every layer of weld seam welding, the weld seam long at circumferencial direction carries out segmentation, positive and negative alternate is symmetrically welded weld seam, and welding sequence is welded seam front → with carbon arc gas back chipping → polishing groove → welded seam reverse side → welded seam front;
D. except that ground floor and last one deck, every welding one deck reduces welding stress with the air pressure gun method for oscillating, and vibration temperature is more than 100～150 ℃ or 400 ℃;
E. the big weld seam of first welding contracted quantity, the weld seam of stressed maximum in the welded disc turbine rotor support again, adopting thickness of slab is the ring muscle of 60mm, assembly welding centerbody and ring muscle, postwelding processing make that the thickness of slab of ring muscle is 50mm, cut the mounting hole of ring muscle, the polishing scarfing is to smooth, open the welding stress liberation port of 4 symmetries at the ring web plate excircle, guarantee that peripheral weld can effectively reduce welding stress, 12 technology triangle reinforcements evenly are set at the circumferencial direction of upstream and downstream side braking ring flat-plate;
F. after the rotor field spider welding is finished, hang in whole removing stress annealing in the annealing furnace immediately.
2, bulb through-flow units radial type rotor support rack welding deformation controlling means according to claim 1 is characterized in that: the solder technology of employing is the argon-rich mixed gas weldering, Ar and CO in the rich argon mixture gas
2Part by weight be 8: 2, the value of Ar is 20～24L/min, CO
2Value be 5～6L/min, welding current is 180～260A, arc voltage is 26～32V, speed of welding is 40～60cm/min, wire feed rate 5～10m/min.
3, bulb through-flow units radial type rotor support rack welding deformation controlling means according to claim 1, it is characterized in that: the technological parameter of annealing in process is, charging temperature≤200 ℃, programming rate: being 80～100 ℃/h before 400 ℃, is≤20 ℃/h after 400 ℃, and holding temperature is 600 ℃～650 ℃, temperature retention time is 5 hours, cooling velocity: being≤24 ℃/h on 400 ℃, is≤120 ℃/h under 400 ℃, and tapping temperature is≤150 ℃.
4, bulb through-flow units radial type rotor support rack welding deformation controlling means according to claim 1 is characterized in that: the interlayer temperature is not less than preheat temperature in the layering welding process, is not higher than 30 ℃ of preheat temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100219156A CN100434226C (en) | 2006-09-22 | 2006-09-22 | Bulb through-flow units radial type rotor support rack welding deformation controlling means |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100219156A CN100434226C (en) | 2006-09-22 | 2006-09-22 | Bulb through-flow units radial type rotor support rack welding deformation controlling means |
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| Publication Number | Publication Date |
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| CN1923429A CN1923429A (en) | 2007-03-07 |
| CN100434226C true CN100434226C (en) | 2008-11-19 |
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| CNB2006100219156A Expired - Fee Related CN100434226C (en) | 2006-09-22 | 2006-09-22 | Bulb through-flow units radial type rotor support rack welding deformation controlling means |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101564577B (en) * | 2009-06-05 | 2015-08-12 | 贵州航天风华精密设备有限公司 | A kind of method reducing medical accelerator support and head plate welding deformation |
| CN103008833B (en) * | 2011-09-22 | 2016-02-24 | 宝山钢铁股份有限公司 | The overlaying method of dovetail groove anticorrosion antiwear layer |
| CN102974941A (en) * | 2012-12-06 | 2013-03-20 | 贵州华阳电工有限公司 | Method for welding in segments |
| CN104493369B (en) * | 2014-11-05 | 2017-06-13 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of cantilever, plate spoke titanium alloy casing welding deformation controlling method and equipment |
| CN109967974B (en) * | 2019-02-26 | 2021-11-26 | 安徽森钢建筑工程有限公司 | Method for reducing welding stress of steel structure product |
| CN111843259A (en) * | 2020-06-02 | 2020-10-30 | 中煤北京煤矿机械有限责任公司 | Welding method for post-welding stress-relief-free annealing of Q550-grade thick plate |
| CN114473134B (en) * | 2022-02-24 | 2024-04-16 | 中国长江电力股份有限公司 | Rotor support weak constraint symmetrical welding process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5189279A (en) * | 1991-12-30 | 1993-02-23 | General Electric Company | Steam turbine rotor welding |
| CN1103341A (en) * | 1994-08-13 | 1995-06-07 | 中国水利水电第四工程局机电安装处 | Process for installation of in-situ welded large-size disc type water-wheel generator rotor support |
| JP2003154454A (en) * | 2001-11-19 | 2003-05-27 | Toshiba Corp | Method for welding divided structural bodies for rotor |
-
2006
- 2006-09-22 CN CNB2006100219156A patent/CN100434226C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5189279A (en) * | 1991-12-30 | 1993-02-23 | General Electric Company | Steam turbine rotor welding |
| CN1103341A (en) * | 1994-08-13 | 1995-06-07 | 中国水利水电第四工程局机电安装处 | Process for installation of in-situ welded large-size disc type water-wheel generator rotor support |
| JP2003154454A (en) * | 2001-11-19 | 2003-05-27 | Toshiba Corp | Method for welding divided structural bodies for rotor |
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| CN1923429A (en) | 2007-03-07 |
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Owner name: DEC DONGFENG ELECTRIC MACHINERY CO., LTD. Free format text: FORMER NAME: DONGFENG MOTOR FACTORY CO., LTD., SICHUAN |
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Address after: 614802 Sichuan city of Leshan Province East Electric Group Dongfeng Motor Co., Wutongqiao District Patentee after: DEC Dongfeng Electric Machinery Co., Ltd. Address before: Leshan City, Sichuan province Wutongqiao District 614802 Sichuan Dongfeng Motor Factory Co Ltd Patentee before: Dongfeng Motor Factory Co., Ltd., Sichuan |
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Granted publication date: 20081119 Termination date: 20130922 |