CN105171332A - Method for processing weld cracks in rotor support of tubular hydro-generator - Google Patents
Method for processing weld cracks in rotor support of tubular hydro-generator Download PDFInfo
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- CN105171332A CN105171332A CN201510731855.6A CN201510731855A CN105171332A CN 105171332 A CN105171332 A CN 105171332A CN 201510731855 A CN201510731855 A CN 201510731855A CN 105171332 A CN105171332 A CN 105171332A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
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- Butt Welding And Welding Of Specific Article (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention relates to a method for processing weld cracks in a rotor support of a tubular hydro-generator. A wheel hub disc of a rotor center body and an inclined support arm are made from two different steels, the welding material of the present weld point is ER50-6 welding wire, workers find a plurality of cracks in a k-type groove and the surface of a reinforcing fillet weld between an inclined rib of a rotor support and he wheel hub during yearly overhaul of a set. Because the quality of the surface of a fillet weld is poor, sources of microscopic cracks caused by fatigue easily generate under the function of alternate stress during operation of a set, the sources of microscopic cracks can develop into macroscopic cracks which may make a weld fracture caused by fatigue. The invention relates to a method for checking and eliminating cracks highly matched welding material is employed, welding deformation is controlled, residual stress of a weld is eliminated through an ultrasonic impact method, the surface quality of the weld is optimized, so that the fatigue resistance of the weld can be improved.
Description
Technical field: the processing method that the present invention relates to a kind of tubular-turbine generator rotor field spider bead crack.
, after running a period of time, there is a large amount of crackle in interrupted shape distribution, badly influenced the safe operation of unit in background technology: the welded seam area between tubular-turbine generator rotor field spider diagonal bar and wheel hub.The method of usual grinder buffing removes crackle, employing and the equicohesive welding material of mother metal carries out repair welding, face of weld carries out polishing and magnetic powder inspection MT, this interrupted face crack repeatedly occurs again after REPAIR WELDING, and crack problem is not solved thoroughly.
Summary of the invention: the object of this invention is to provide a kind ofly have that equipment cost is low, the processing method of technique simple tubular-turbine generator rotor field spider bead crack and other defect.Technical scheme of the present invention is: a kind of processing method of tubular-turbine generator rotor field spider bead crack, carries out according to the following steps:
One, defect inspection and confirm again: use the method for detection butt welded seam of magnetic powder inspection MT/ dye penetrant inspection PT to enter to check, distribution and the size of marking of defects, crackle need record, file for future examination;
Two, adopt the method for machinery to remove crackle and dreg defect, and prepare the bevel for welding being greater than 30 degree;
Three, in each symmetry of rotor field spider magnetic pole upper and lower surface, four pieces of dial gauges are installed before starting welding; At the radial upper and lower side of rotor field spider magnetic pole outer surface, four pieces of dial gauges are respectively installed; In collector ring radial direction and brake hoop end face, two pieces of dial gauges are respectively installed, with welding after-poppet deformation tendency and relative deflection in monitoring welding process, and keep a record, according to deformation adjustment repair welding order in welding process;
Four, the repair welding of defect: adopt electrical heating method heating by more than the mother metal homogeneous heating to 150 of bevel for welding and near zone thereof DEG C, welding material is low-alloy high-strength steel electrode and the welding wire of high coupling, when the bevel for welding degree of depth is greater than 5mm, adopt manual electric arc welding; When the bevel for welding degree of depth is less than 5mm, adopt argon tungsten-arc welding;
Five, the reinforcement of angle welding: after the angle welding face crack between diagonal bar and wheel hub is all fixed, by the repair welding two layers again of original angle welding, makes fillet weld size increase by 2 ~ 4mm;
Six, optimize welding line surface quality: face of weld will be polished in circular shape, surface roughness is more than 6.3, reach requirement size, must carry out roughly grinding and refining;
Seven, weld residual stress is eliminated: adopt the metal surface of ultrasonic impact technology to welding region and face of weld and toe of weld to carry out the process of elimination residual stress;
Eight, check: after the repair welding of defect completes 24 hours, carry out the defect detecting test of magnetic powder inspection MT/ dye penetrant inspection PT, passed examination also can turn lower sequence and carries out face of weld japanning after in many ways confirming.
The technique effect that the present invention produces: by analyzing power plant's rotor center part wheel hub disk and the sampling of oblique support arm, use carbon equivalent method to calculate the cold cracking inclination of two kinds of materials, the character analyzing crackle in conjunction with crack position, distribution etc. is cold crack.Determining crackle Producing reason is because the welding procedure of wheel hub disk steel grade different from support arm controls not good, steel hardenability is higher, be subject to hydrogen attack and brittle, under the effect of the alternate stress produced in constraint stress and running, develop into microfissure source, and then be expanded into macroscopic cracking, the fatigue fracture of weld seam can be caused time serious.
According to rotor field spider crackle Producing reason, propose to improve treatment measures: adjustment welding procedure, improve weld preheating, postwelding and carry out weld seam and to disappear hydrogen process, extend the insulation slow cooling time; Select low hydrogen wlding, reduce hydrogen content in weld metal; Adopt the method for manual electric arc welding, strengthen weld size, increase weld strength; Adopt ultrasonic impact technology to eliminate weld residual stress, make weld seam rounding off, eliminate the defects such as regional area is sharply given prominence to, incomplete fusion, undercut, improve the fatigue resistance of weld seam comprehensively, effectively control weld seam cold crack and produce.After improvement project is implemented, through the operation test more than 2 years, do not have the phenomenon before occurring, rotor field spider Crack handling accomplishes the end in view, and this significant problem is fundamentally governed.Compared to other repair process technology, welding repair method of the present invention implements the processing layer material that formed and mother metal is metallurgical binding, makes the quality of whole rotor field spider more reliable.And there is the advantage that equipment size is little, cost is low, technique is simple, can be used for small space construction.
The present invention analyzes according to the performance of material, Non-Destructive Testing result, the many-side such as crack and multiple position, confirms causes of crack.The original processing scheme of major tuneup, owing to have employed the low-alloy high-strength steel welding material of high coupling and using ultrasonic impact technology butt welded seam surface to process, improve intensity and the face of weld quality of weld seam, eliminate part weld residual stress, effectively raise the anti-fatigue performance of welded seam area.Through the operation more than 2 years, there is no the phenomenon before occurring, prove that the crack problem of rotor field spider is resolved substantially.
Accompanying drawing illustrates:
The position schematic diagram that Fig. 1 rotor field spider crackle occurs
Detailed description of the invention:
One, as shown in Figure 1, the welded seam area 3 between rotor discs 1 and rotor support arm 2 uses the method for detection butt welded seam of magnetic powder inspection MT/ dye penetrant inspection PT to enter to check, the distribution of marking of defects, crackle and size also record file for future examination;
Two, by the method for machinery, remove crackle and other defect, and prepare the bevel for welding being greater than 30 degree, the method for machinery is for using grinder buffing;
Three, before starting weldering, in each symmetry of rotor field spider magnetic pole upper and lower surface, four pieces of dial gauges are installed; At the radial upper and lower side of rotor field spider magnetic pole outer surface, four pieces of dial gauges are respectively installed; With welding after-poppet deformation tendency and relative deflection in monitoring welding process, and keep a record.According to deformation adjustment repair welding order in welding process;
Four, the repair welding of defect, adopt electrical heating method heating by more than the mother metal homogeneous heating to 150 of bevel for welding and near zone thereof DEG C, welding material is low-alloy high-strength steel electrode and the welding wire of high coupling.When the bevel for welding degree of depth is greater than 5mm, adopt manual electric arc welding: core diameter 3.2mm, welding current 80-120A, weldingvoltage 22-28V; When the bevel for welding degree of depth is less than 5mm, adopt argon tungsten-arc welding: weldering: filament diameter 2.0mm, welding current 80-160A, weldingvoltage 24-32V, gas flow 8-12L/min;
Five, the reinforcement of angle welding, after the angle welding face crack between diagonal bar and wheel hub is all fixed, by the repair welding two layers again of original angle welding, makes fillet weld size increase by 2 ~ 4mm;
Six, optimize welding line surface quality, face of weld will be polished in circular shape, and surface roughness is more than 6.3.Reach requirement size, must carry out roughly grinding and refining;
Seven, eliminate weld residual stress, adopt the metal surface of ultrasonic impact technology to welding region (face of weld and toe of weld) to carry out the process of elimination residual stress, improve the fatigue strength of welding point, prevent weld cracking, extend fatigue life;
Eight, check, after the repair welding of defect completes 24 hours, carry out magnetic powder inspection MT/ dye penetrant inspection PT defect detecting test, passed examination also can turn lower sequence after in many ways confirming.
Claims (1)
1. a processing method for tubular-turbine generator rotor field spider bead crack, is characterized in that: carry out according to the following steps:
One, defect inspection and confirm again: use the method for detection butt welded seam of magnetic powder inspection MT/ dye penetrant inspection PT to enter to check, distribution and the size of marking of defects, crackle need record, file for future examination;
Two, adopt the method for machinery to remove crackle and dreg defect, and prepare the bevel for welding being greater than 30 degree;
Three, in each symmetry of rotor field spider magnetic pole upper and lower surface, four pieces of dial gauges are installed before starting welding; At the radial upper and lower side of rotor field spider magnetic pole outer surface, four pieces of dial gauges are respectively installed; In collector ring radial direction and brake hoop end face, two pieces of dial gauges are respectively installed, with welding after-poppet deformation tendency and relative deflection in monitoring welding process, and keep a record, according to deformation adjustment repair welding order in welding process;
Four, the repair welding of defect: adopt electrical heating method heating by more than the mother metal homogeneous heating to 150 of bevel for welding and near zone thereof DEG C, welding material is low-alloy high-strength steel electrode and the welding wire of high coupling, when the bevel for welding degree of depth is greater than 5mm, adopt manual electric arc welding; When the bevel for welding degree of depth is less than 5mm, adopt argon tungsten-arc welding;
Five, the reinforcement of angle welding: after the angle welding face crack between diagonal bar and wheel hub is all fixed, by the repair welding two layers again of original angle welding, makes fillet weld size increase by 2 ~ 4mm;
Six, optimize welding line surface quality: face of weld will be polished in circular shape, surface roughness is more than 6.3, reach requirement size, must carry out roughly grinding and refining;
Seven, weld residual stress is eliminated: adopt the metal surface of ultrasonic impact technology to welding region and face of weld and toe of weld to carry out the process of elimination residual stress;
Eight, check: after the repair welding of defect completes 24 hours, carry out the defect detecting test of magnetic powder inspection MT/ dye penetrant inspection PT, passed examination also can turn lower sequence and carries out face of weld japanning after in many ways confirming.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510731855.6A CN105171332A (en) | 2015-11-02 | 2015-11-02 | Method for processing weld cracks in rotor support of tubular hydro-generator |
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| CN201510731855.6A CN105171332A (en) | 2015-11-02 | 2015-11-02 | Method for processing weld cracks in rotor support of tubular hydro-generator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105522252A (en) * | 2015-12-31 | 2016-04-27 | 西安轨道交通装备有限责任公司 | Method for processing internal welding defects of straight-tube elbow combined tube fitting |
| CN106290385A (en) * | 2016-08-15 | 2017-01-04 | 上海发电设备成套设计研究院 | The supervising device of the rotor surface manufacturing defect of steam turbine and gas turbine and method |
| CN106324093A (en) * | 2016-08-15 | 2017-01-11 | 上海发电设备成套设计研究院 | Device and method for monitoring interior manufacturing defects of rotors of steam turbine and gas turbine |
| CN106392462A (en) * | 2016-11-22 | 2017-02-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Repairing method for cracks of spoke-type casing |
| WO2021068983A1 (en) * | 2019-11-08 | 2021-04-15 | 南通大学 | Smart acoustic information recognition-based welded weld impact quality determination method and system |
| CN115890132A (en) * | 2022-09-28 | 2023-04-04 | 华能澜沧江水电股份有限公司 | Method for eliminating cracks of runner of water turbine |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105522252A (en) * | 2015-12-31 | 2016-04-27 | 西安轨道交通装备有限责任公司 | Method for processing internal welding defects of straight-tube elbow combined tube fitting |
| CN106290385A (en) * | 2016-08-15 | 2017-01-04 | 上海发电设备成套设计研究院 | The supervising device of the rotor surface manufacturing defect of steam turbine and gas turbine and method |
| CN106324093A (en) * | 2016-08-15 | 2017-01-11 | 上海发电设备成套设计研究院 | Device and method for monitoring interior manufacturing defects of rotors of steam turbine and gas turbine |
| CN106324093B (en) * | 2016-08-15 | 2019-04-09 | 上海发电设备成套设计研究院 | The monitoring method of the internal rotor manufacturing defect of steam turbine and gas turbine |
| CN106290385B (en) * | 2016-08-15 | 2019-04-09 | 上海发电设备成套设计研究院 | The monitoring method of the rotor surface manufacturing defect of steam turbine and gas turbine |
| CN106392462A (en) * | 2016-11-22 | 2017-02-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Repairing method for cracks of spoke-type casing |
| WO2021068983A1 (en) * | 2019-11-08 | 2021-04-15 | 南通大学 | Smart acoustic information recognition-based welded weld impact quality determination method and system |
| CN115890132A (en) * | 2022-09-28 | 2023-04-04 | 华能澜沧江水电股份有限公司 | Method for eliminating cracks of runner of water turbine |
| CN115890132B (en) * | 2022-09-28 | 2024-04-05 | 华能澜沧江水电股份有限公司 | Method for eliminating cracks of turbine runner |
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Application publication date: 20151223 |