CN110125607A - Suitable for cheating the field repairing method of cavity space - Google Patents
Suitable for cheating the field repairing method of cavity space Download PDFInfo
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- CN110125607A CN110125607A CN201910403167.5A CN201910403167A CN110125607A CN 110125607 A CN110125607 A CN 110125607A CN 201910403167 A CN201910403167 A CN 201910403167A CN 110125607 A CN110125607 A CN 110125607A
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Abstract
The field repairing method that the present invention provides a kind of suitable for cheating cavity space, it uses arc welding robot, heating technique inside and outside live numerical control processing and Medium frequency induction, the defects of ontology crackle and valve seat for eliminating main vapour high-pressure regulating valve body inner cavity crack, valve after reparation reaches factory level, it ensure that the safety of generating equipment, the substantial equipment hidden danger for Solve on site same type units high temperature and high pressure steam valve in a short time provides methods and techniques route.
Description
The application is the divisional application of following original application:
-- the applying date of original application: on 09 30th, 2018
-- the application number of original application: 201811163163.6
-- the invention and created name of original application: the field repairing method suitable for cheating cavity space
Technical field
The present invention relates to Site for Unit to repair field, and in particular, to suitable for cheating the field repairing method of cavity space, especially
It is the combustion engine unit main steam control valve field repairing method based on arc welding robot.
Background technique
Year start-stop time with higher requirement of the power plant for units such as single shaft gas Steam Combined Cycles, is opened in usual year
Stop number ≮ 200.It is carried out in Disintegration overhaul to main steam control valve, sealing surface of seat is one of maintenance object.It is close for valve seat
Cover position the case where there are Multiple site cracks, main feature show as radially radial and outer circle circumferential crack, directly affect
The economy and equipment of generating set operate normally.But due to narrow space in valve chamber, valve seat is in dell position, should not return
Repair in shop reason, it is therefore necessary to it be repaired using live automated arm and technology.
Summary of the invention
For the defects in the prior art, the field repair side that the object of the present invention is to provide a kind of suitable for cheating cavity space
Method.
A kind of field repairing method suitable for cheating cavity space provided according to the present invention, includes the following steps:
The facial position turning to be processed of existing defects is removed；
Planning carries out arc-welding with robot；
Interior external heat is carried out by Medium frequency induction；
Machined surface part, which is treated, using robot carries out REPAIR WELDING.
Preferably, the region of the turning includes initial pile welding layer material and welding heat affected zone；Light is carried out after turning
Spectral test confirmation and dye penetrant inspection are to ensure that defect is all removed.
Preferably, described the step of arc-welding is carried out by robot, comprising:
Off-line simulation step: the offline dummy model for establishing hole chamber, according to hole cavity configuration determine matched welding gun length,
Shape and posture, Virtual Demonstration welding gun movement track and path, determine welding track and posture with hole chamber internal structure without
Conflict；
Parameter transplants step: robot and positioner linking come the scene of simulating face associated components to be processed in laboratory
Position and posture, construct working condition and mode as live online repairing environment, obtain a full set of work by this simulation
The parameter of off-line simulation is transplanted to scene by skill parameter；
3 teaching steps of robot: calculating the center of circle by three-point fix, to cook up a round track, completes
Teaching work；
Welding bead and trajectory planning step: must take multi-pass welding, several according to established space in practical welding
What coordinate diagram completes the welding bead planning of multilayer multiple tracks as follows:
1) position is sought at 3 points；
2) it is calculated according to the difference in height and semidiameter of welding face in drawing and the flange periphery of face associated components to be processed new
Tool coordinates system；
3) for multilayer multiple tracks built-up welding, offset is established according to the weldering thickness of per pass, carries out the calibration of welding track precision；Then
According to the track of process requirements cutting and offset circle, different starting and ending welding positions is determined according to geometric position, is met
The technical need that welding point is staggered；
The reinforcement and width of per pass weld seam are established according to welding current, wire feed rate and welding speed parameter by engineer testing
Degree, and then complete the implementation of multilayer welding bead using migration program is welded, i.e., the position height of welding bead is established in Z-direction, in the side Y
To the opposite deviation post for establishing welding bead；The Z-direction and Y-direction of subsequent passes are inputted in arc welding robot in the whole welding process
The realization of positional shift value is welded according to the track and speed planned in advance.
Preferably, described the step of interior external heat is carried out by Medium frequency induction, comprising:
Inner wall is heat-treated, interior heat induced heat coil is fixed in L-type mobile disk, connects heating power supply and interior
The water-cooled cable of heating induction coil；Before welding or reparation, interior heating induction coil is first moved to hole chamber by lifting platform tooling
Flange port, then enter back into hole chamber cavity in until face to be processed position；
Outer wall is heat-treated, flexible air-cooled heating cable is directly wound in the outer wall of face associated components to be processed, from
Valve face associated components to be processed start flexible air-cooled heating cable at the end of being preheating to entire welding and are constantly in working condition,
Flexible air-cooled heating cable outer wall forms hot dam together；
Inner and outer wall heat treatment starts simultaneously at work, after preheating temperature is constant, only exits interior heat induced heat coil, outside
Wall heat treatment continues steady temperature, to guarantee the interlayer temperature in welding or repair process；After completing welding or repairing, interior heating
Incude heat coil to enter, starts to carry out at postwelding heat with identical heating rate, constant temperature time, rate of temperature fall with additional heat coil
Reason, until entire heat treatment process is fully completed.
It is preferably, described to treat the step of machined surface part carries out REPAIR WELDING using robot, comprising:
Preheating step: weld preheating is carried out using heat treatment on spot equipment and is kept the temperature, infrared thermometry is used after heat preservation
Instrument carries out temperature measurement, executes next repair welding step after meeting range；
Repair welding step: built-up welding, built-up welding size restoration to original are carried out using the defect elimination position that arc welding robot treats machined surface
Size；Using the welding of layering shunting；It is kept the temperature and is heat-treated after repair welding, final heat treatment is held together after sealing surface weld deposit
Row；
Built-up welding groove turning step: carrying out built-up welding retaining wall on slope to overlaying surface using numerically controlled processing equipment, to groove face and
Built-up welding position carries out dye penetrant inspection；
Built-up welding step: preheating built-up welding, carries out built-up welding using layering shunting；
Heat treatment step: heat treatment temperature and the tempering temperature of substrate are consistent, heating rate, holding temperature, heat preservation
Time, cooling rate, temperature of unpacking, which are subject to, to be monitored thermocouple and shows；
It shapes machining steps: confirming the overall size in final face to be processed, carry out numerical control programming and confirm that program is correct,
Finally carry out the forming in face to be processed.
Preferably, face to be processed is sealing surface, and face associated components to be processed are valve seat.
It preferably, further include survey of repairs step.
Compared with prior art, the present invention have it is following the utility model has the advantages that
It is high to eliminate main vapour using heating technique inside and outside arc welding robot, live numerical control processing and Medium frequency induction by the present invention
The defects of pressing the ontology crackle of regulating valve body cavity and valve seat to crack, the valve after reparation reach factory level, ensure that hair
The safety of electric equipment, the substantial equipment hidden danger for Solve on site same type units high temperature and high pressure steam valve in a short time provide
Methods and techniques route.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram of valve seat in valve.
Fig. 2 is main steam control valve field repair Technology Roadmap.
Fig. 3 is secondary machine path planning figure.
Fig. 4 is the association schematic diagram between 3 teachings and welding bead planning.
Fig. 5 is inner wall induction coil structural schematic diagram.
It is shown in figure:
Sealing surface of seat 101
Valve deck inner hole 102
Screw hole 103
Valve deck position 104
Valve seat endface position 105
Along 106 under arc surface
Throat 107
Valve chamber 108
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
A kind of field repairing method suitable for cheating cavity space provided according to the present invention, includes the following steps:
The facial position turning to be processed of existing defects is removed；
Planning carries out arc-welding with robot；
Interior external heat is carried out by Medium frequency induction；
Machined surface part, which is treated, using robot carries out REPAIR WELDING.
Preferably, the region of the turning includes initial pile welding layer material and welding heat affected zone；Light is carried out after turning
Spectral test confirmation and dye penetrant inspection are to ensure that defect is all removed.
Preferably, described the step of arc-welding is carried out by robot, comprising:
Off-line simulation step: the offline dummy model for establishing hole chamber, according to hole cavity configuration determine matched welding gun length,
Shape and posture, Virtual Demonstration welding gun movement track and path, determine welding track and posture with hole chamber internal structure without
Conflict；
Parameter transplants step: robot and positioner linking come the scene of simulating face associated components to be processed in laboratory
Position and posture, construct working condition and mode as live online repairing environment, obtain a full set of work by this simulation
The parameter of off-line simulation is transplanted to scene by skill parameter；
3 teaching steps of robot: calculating the center of circle by three-point fix, to cook up a round track, completes
Teaching work；
Welding bead and trajectory planning step: must take multi-pass welding, several according to established space in practical welding
What coordinate diagram completes the welding bead planning of multilayer multiple tracks as follows:
1) position is sought at 3 points；
2) it is calculated according to the difference in height and semidiameter of welding face in drawing and the flange periphery of face associated components to be processed new
Tool coordinates system；
3) for multilayer multiple tracks built-up welding, offset is established according to the weldering thickness of per pass, carries out the calibration of welding track precision；Then
According to the track of process requirements cutting and offset circle, different starting and ending welding positions is determined according to geometric position, is met
The technical need that welding point is staggered；
The reinforcement and width of per pass weld seam are established according to welding current, wire feed rate and welding speed parameter by engineer testing
Degree, and then complete the implementation of multilayer welding bead using migration program is welded, i.e., the position height of welding bead is established in Z-direction, in the side Y
To the opposite deviation post for establishing welding bead；The Z-direction and Y-direction of subsequent passes are inputted in arc welding robot in the whole welding process
The realization of positional shift value is welded according to the track and speed planned in advance.
Preferably, described the step of interior external heat is carried out by Medium frequency induction, comprising:
Inner wall is heat-treated, interior heat induced heat coil is fixed in L-type mobile disk, connects heating power supply and interior
The water-cooled cable of heating induction coil；Before welding or reparation, interior heating induction coil is first moved to hole chamber by lifting platform tooling
Flange port, then enter back into hole chamber cavity in until face to be processed position；
Outer wall is heat-treated, flexible air-cooled heating cable is directly wound in the outer wall of face associated components to be processed, from
Valve face associated components to be processed start flexible air-cooled heating cable at the end of being preheating to entire welding and are constantly in working condition,
Flexible air-cooled heating cable outer wall forms hot dam together；
Inner and outer wall heat treatment starts simultaneously at work, after preheating temperature is constant, only exits interior heat induced heat coil, outside
Wall heat treatment continues steady temperature, to guarantee the interlayer temperature in welding or repair process；After completing welding or repairing, interior heating
Incude heat coil to enter, starts to carry out at postwelding heat with identical heating rate, constant temperature time, rate of temperature fall with additional heat coil
Reason, until entire heat treatment process is fully completed.
It is preferably, described to treat the step of machined surface part carries out REPAIR WELDING using robot, comprising:
Preheating step: weld preheating is carried out using heat treatment on spot equipment and is kept the temperature, infrared thermometry is used after heat preservation
Instrument carries out temperature measurement, executes next repair welding step after meeting range；
Repair welding step: built-up welding, built-up welding size restoration to original are carried out using the defect elimination position that arc welding robot treats machined surface
Size；Using the welding of layering shunting；It is kept the temperature and is heat-treated after repair welding, final heat treatment is held together after sealing surface weld deposit
Row；
Built-up welding groove turning step: carrying out built-up welding retaining wall on slope to overlaying surface using numerically controlled processing equipment, to groove face and
Built-up welding position carries out dye penetrant inspection；
Built-up welding step: preheating built-up welding, carries out built-up welding using layering shunting；
Heat treatment step: heat treatment temperature and the tempering temperature of substrate are consistent, heating rate, holding temperature, heat preservation
Time, cooling rate, temperature of unpacking, which are subject to, to be monitored thermocouple and shows；
It shapes machining steps: confirming the overall size in final face to be processed, carry out numerical control programming and confirm that program is correct,
Finally carry out the forming in face to be processed.
Preferably, face to be processed is sealing surface, and face associated components to be processed are valve seat.
It preferably, further include survey of repairs step.
Below by a preferred embodiment, by taking F grades of single shaft gas Steam Combined Cycle units as an example, to the present invention into
One step specific description.
Step 1: investigation main steam control valve technical requirements and field surveys
1.1: investigation main steam control valve technical requirements
Main steam control valve valve body material meets SA182-F22 standard, and valve seat is an integral structure, i.e. the heap directly on valve body
Sealing surface is welded, resurfacing welding material is 12%Cr Steel (AWS ER-410).Main steam control valve valve core sealed cover then uses
Stellite6 alloy welding deposit, the relatively soft or hard combination of the two meet Gas Generator Set and guarantee its sealing under conditions of high-frequency start and stop
The tightness in face.
1.2: field surveys
It is checked through field surveys and size, main steam control valve valve seat is globoidal structure；Sealing surface of seat maximum gauge is
289.17mm；Valve deck diameter of bore is 345.5mm；Screw hole centre distance is 520mm；Valve deck to valve seat face height is 770mm,
It is 855.01mm to arc surface lower edge height；Throat's latus rectum is 184mm, sees Fig. 1.It is from measurement result as can be seen that empty in valve chamber
Between it is narrow, valve seat is in dell position, and coverlay to be repaired can not be repaired according to conventional manual method, in order to guarantee to repair matter
Amount and the exploitativeness repaired, the present invention have formulated robot+numerical control processing+burning optimization on line automation field repair side
Case.
Step 2: drafting field repair operating technology route
To guarantee that the repairing quality of main steam control valve valve seat reaches factory level, after grasping its manufacturing process, for existing
Field environment and condition, according to situ measurements, the present invention has formulated field repair operating technology route as shown in Figure 2.Its
In, if without blow loss, crackle, stomata, falling off, then it is assumed that do not find that object, power cut-off need to be repaired；If the technology of being unsatisfactory for is wanted
It asks, then returns and re-execute damaged face machining；If preheating temperature does not reach requirement, hungry return re-executes inside and outside wall and adds
Heat；If surfacing quality is unsatisfactory for requiring, return re-executes robot dell built-up welding；If heat treatment do not complete, return after
It is continuous to be heated using inner heating device；If processing dimension, surface hardness do not reach requirement, return re-executes repair surface and adds
Work；If grinding precision, sealing surface, which combine, does not reach requirement, return re-executes application grinding device.
Step 3: live numerical control processing
3.1: maker processing tool
The mach key core in scene is how to position machining, while determining mach benchmark, it is contemplated that
Machined surface is concentric with flange face, and the size according to field device is surveyed and drawn, and has made positioning tool, wherein the positioning tool packet
The mounting flange, support post, locating piece etc. to match with valve deck is included, these auxiliary moulds may insure live machining apparatus
Intensity and required precision.Those skilled in the art can realize the processing to auxiliary mould in conjunction with the prior art, due to auxiliary
Tooling is not emphasis of the invention, and it will not be described here.
3.2: installation and commissioning device
Positioning tool and numerical control machining apparatus are mounted on main steam control valve valve deck, according to main steam control valve valve seat
Size technologies requirement, carries out NC Machining Program and equipment debugging.
3.3: machining process control
3.3.1: scene machining and inspection
The sealing surface of seat position of existing defects, answers first turning clean, and turning region includes initial pile welding layer material and welding
Spectral test confirmation and dye penetrant inspection are carried out after heat affected area (thickness is determined as 10mm) turning to ensure that valve body lacks
It falls into and all removes.
3.3.2: secondary machine path planning
In this recovery scenario implementation process, through non-destructive testing the results show that valve body also existing defects, crack depth is about
35mm, so carrying out secondary turning to existing segmental defect.Meanwhile damage of the turning to valve body in order to prevent,
Turning size has made further planning, which can reduce the damage of valve body as far as possible, as shown in Figure 3.
3.3.3: machining content
According to defect situation existing for main steam control valve, live machining work is divided into three parts composition, including original
Overlay cladding defect expressivity, the machining of valve body defect and the sealing surface of seat forming for repairing heap postwelding.
Step 4: planning carries out arc-welding with robot welding technology
Due to being greater than 800mm to Bead weld repair site depth, belong to the dell built-up welding in small space.Meanwhile it is live
Maintenance duration is shorter, needs just to can ensure that repairing rear quality meets or exceeds factory level using heat weldable method.Therefore, basic row
A possibility that in addition to repaired by hand.Using in the off-line simulation of arc welding robot, parameter transplanting, 3 teachings and small space
The technologies such as welding bead and trajectory planning can preferably overcome the limitation of site environment and condition.
4.1: off-line simulation
In view of valve mechanism is special, it is necessary to reparation task could be completed using welding gun and certain posture, so whole
It needs to be determined that whether length, shape and the posture of welding gun can satisfy welding requirement, while it needs to be determined that welding rail before body design
Mark and posture and valve internal structure Lothrus apterus.For optimization design, by establishing valve dummy model offline, in robot
The track and path of Virtual Demonstration welding gun movement, realize welding gun track, posture, path and machine inside Robot studio
Manually dress, fixture and welding gun size is pre-designed.
4.2: parameter transplanting
Since period for repairing online of scene is generally shorter, the limited time of live On-line construction is left for, so must be
Robot motion track, welding current, voltage, speed, the basic parameters such as welding gun track are obtained before into scene.For this purpose, passing through
Robot and the linkage of high tonnage positioner are simulated to position and the posture of valve site in laboratory, constructed online with scene
Repairing environment the same working condition and mode obtain a full set of technological parameter by this simulation, the parameter of off-line simulation are moved
It plants to scene, only needs on-line fine i.e. and can guarantee the high efficiency and high quality of field repair.
4.3: 3 teachings of robot
Valve internal space is relatively narrow, this is also the main reason for can not carrying out repaired by hand.Equally, robot is also given
Teaching work cause certain technical difficulty.Processing features, valve sealing face are designed and manufactured according to the structure of valve body
It is a center of circle circle with bonnet flange end face, there is good concentricity.Meanwhile according to geometrical principle, only 3 points need to be determined just
It can determine a circle.Therefore, in robot teaching, so that it may fixed by 3 points using the calculation function of robot interior
Position calculates the center of circle, to cook up a round track, teaching work is rapidly completed.
4.4: welding bead and trajectory planning in small space
Valve body and sealing surface need the part of built-up welding to have certain thickness, while to control the dilution rate of welding process, single
Layer single track is unable to complete recovery scenario, it is necessary to take multi-pass welding.In practical welding, space geometry coordinate diagram is being established
Under the premise of, it is only necessary to the welding bead planning of multilayer multiple tracks can be completed in following several steps:
1) seek position at 3 points (position is sought by teaching or laser)；
2) new tool coordinates system is calculated according to the difference in height and semidiameter of welding face in drawing and flange periphery, i.e., only needed
Shu Ru ⊿ H Zhi is He ⊿ r value；
3) for multilayer multiple tracks built-up welding, offset is established according to the weldering thickness of per pass, carries out the calibration of welding track precision, i.e., only
Shu Ru ⊿ H1 Zhi is needed He ⊿ r1 value；Then the track according to process requirements cutting and offset circle, so that it may be gone according to geometric position
It determines different starting and ending welding positions, meets the technical need that welding point is staggered.
Meanwhile it can be established according to parameters such as welding current, wire feed rate and speeds of welding by a series of engineer testing
The reinforcement and width of per pass weld seam, and then complete the implementation of multilayer welding bead using migration program is welded, i.e., it establishes and welds in Z-direction
The position height in road establishes the opposite deviation post of welding bead in the Y direction.Therefore, as long as in the whole welding process in arc-welding machine
The Z-direction of subsequent passes and Y-direction positional shift value are inputted in device people to weld according to the track and speed planned in advance,
It no longer needs to carry out every one of weld seam the work of teaching again.
Step 5: external heat in Medium frequency induction
Main steam control valve valve body and sealing surface complex contour, wall thickness dimension are changeable.According to traditional outer wall heat transfer
Heating means, the temperature difference are larger.Heating technique can be according to live high temperature and high pressure steam valve sealing face structure inside and outside Medium frequency induction
With the complexity of environment, it is ensured that meet the requirement of heating process and working sequence in welding or repair process.As shown in table 1.
1 heating work timing of table
When needing to be heat-treated, tooling is fixed on valve deck first with valve ending cover bolt, then interior heat induced is hot
Coil is fixed in L-type mobile disk, connects the water-cooled cable of heating power supply and induction coil.Before welding or reparation, the line of induction
Circle is first moved to the bonnet flange mouth of valve body by lifting platform tooling, then enters back into valve cavity until in sealing surface
Hole site.Outer wall is heat-treated, flexible air-cooled heating cable can be directly wound in irregular valve outer wall, since valve
It is in running order always at the end of being preheating to entire welding, is formed together " hot dam " in valve outer wall, prevents from excessively radiating,
To guarantee sealing surface heating effect, inner and outer wall heat treatment starts simultaneously at work, after preheating temperature is constant, only exits interior heating
Coil, outer wall heat treatment continue steady temperature, to guarantee the interlayer temperature in welding or repair process, complete welding or repair
Afterwards, interior heating coil enters, and starts to carry out postwelding with identical heating rate, constant temperature time, rate of temperature fall with additional heat coil
Heat treatment, until entire heat treatment process is fully completed.
Step 6: renovation technique control
This repair includes main steam control valve sealing surface of seat and adjacent valve body two parts, it is necessary to first repair valve body again
Built-up welding sealing surface.The two material is different, and the reparation of selection and resurfacing welding material different process are also different, are shown in Table 2.Therefore, technology is difficult
Degree is high, complex process.For this purpose, the formulation of renovation technique must be rationally and accurate, entire technical process wants strict control.
Table 2 is repaired and resurfacing welding material
6.1: preheating
Under the premise of confirming that the turning of defect whole is eliminated, weld preheating is carried out using heat treatment on spot equipment, completes heat
Processing equipment installation and debugging, are preheated after confirmation is errorless.Preheating temperature is 250-300 DEG C, keeps the temperature 1h.It is used after heat preservation
Infrared thermometer carries out temperature measurement, can execute subsequent processing after meeting range.
6.2: valve body repair welding
Built-up welding, built-up welding size restoration to former size of seal contact face are carried out to valve body defect elimination position using arc welding robot.Using
It is layered shunting welding, strict control interlayer temperature is to 300-350 DEG C, the defects of appearance of weld is good, flat appearance, no undercut.
It is heat-treated after carrying out 350-400 DEG C of heat preservation 2h after valve body repair welding, final heat treatment executes together after sealing surface weld deposit.
6.3: sealing surface weld deposit groove turning
Surface build-up welding retaining wall on slope is sealed to valve body overlaying surface using numerically controlled processing equipment, groove depth is not less than 7mm；
Dye penetrant inspection is carried out to groove face and built-up welding position, meets NB/T 47013, I grades qualified.
6.4: sealing surface weld deposit
Built-up welding is preheated, 300-350 DEG C of preheating temperature.Surface build-up welding is sealed using layering shunting.Strict control
Interlayer temperature is to 300-350 DEG C, the defects of appearance of weld is good, flat appearance, no undercut.
6.5: heat treatment
Since sealing surface of seat resurfacing welding material is AWS ER-410, postwelding need to be cooled to MS point or less and carry out Martensite temperature
Transformation, then carry out heating heat treatment.Heat treatment temperature and the tempering temperature of substrate are consistent, constant temperature time=δ ÷ 25 × 2
(h), ÷ δ and ≯ 150 DEG C/h in temperature rate=6250 ,≤80 DEG C are torn open heat-preservation cotton.Reservation complete process curve, heating rate,
Holding temperature, soaking time
Cooling rate, temperature of unpacking, which are subject to, to be monitored thermocouple and shows.
6.6: forming machining
According to the manufacturing technology standard and field surveys size of main steam control valve, final sealing surface overall size is confirmed, into
Row numerical control programming simultaneously confirms that program is correct, is finally sealed the forming in face, surface processing accuracy < 0.4 μm.
Step 7: survey of repairs
Main steam control valve after reparation must reach the quality acceptance standard of factory, including non-destructive testing, Hardness Surveillance and
The work such as sealing surface valve line check.Wherein, Hardness Surveillance should carry out after heat treatment, including ontology and sealing surface of seat,
Hardness number range is HB=200~260.Through final inspection, the field repair quality of main vapour high-pressure governing valve has reached desired effect.
In conclusion the present invention is in the reparation at dell position for narrow space in valve chamber, valve seat in this preference
Feature eliminates F grades of uniaxial combustions by formulating and executing robot+numerical control processing+burning optimization on line automation recovery scenario
It the defects of ontology crackle and valve seat cracking of the main vapour high-pressure governing valve body cavity of gas Steam Combined Cycle unit, repairs rear quality and meets
Every technical requirements.The integrated application of the technologies such as external heat in live numerical control processing, arc welding robot and Medium frequency induction, to eliminate
The significant deficiency of same type high temperature and high pressure steam valve cavity provides technical strategies, is also the site examining and repairing of relevant device
Provide method and approach.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (4)
1. a kind of field repairing method suitable for cheating cavity space, which comprises the steps of:
The facial position turning to be processed of existing defects is removed；
Planning carries out arc-welding with robot；
Interior external heat is carried out by Medium frequency induction；
Machined surface part, which is treated, using robot carries out REPAIR WELDING；
Described the step of interior external heat is carried out by Medium frequency induction, comprising:
Inner wall is heat-treated, interior heat induced heat coil is fixed in L-type mobile disk, heating power supply and interior heating are connected
The water-cooled cable of induction coil；Before welding or reparation, interior heating induction coil is first moved to the method for hole chamber by lifting platform tooling
Then blue mouth enters back into the cavity of the hole chamber until position in face to be processed；
Outer wall is heat-treated, flexible air-cooled heating cable is directly wound in the outer wall of face associated components to be processed, is waited for from valve
Machined surface associated components start flexible air-cooled heating cable at the end of being preheating to entire welding and are constantly in working condition, in flexibility
Air-cooled heating cable outer wall forms hot dam together；
Inner and outer wall heat treatment starts simultaneously at work, after preheating temperature is constant, only exits interior heat induced heat coil, outer wall heat
Processing continues steady temperature, to guarantee the interlayer temperature in welding or repair process；After completing welding or repairing, interior heat induced
Heat coil enters, and starts to carry out post weld heat treatment with identical heating rate, constant temperature time, rate of temperature fall with additional heat coil,
Until entire heat treatment process is fully completed.
2. the field repairing method according to claim 1 for being suitable for cheating cavity space, which is characterized in that the area of the turning
Domain includes initial pile welding layer material and welding heat affected zone；Spectral test confirmation and dye penetrant inspection are carried out after turning to ensure to lack
It falls into and all removes.
3. the field repairing method according to claim 1 for being suitable for cheating cavity space, which is characterized in that face to be processed is close
Cover, face associated components to be processed are valve seat.
4. the field repairing method according to claim 1 for being suitable for cheating cavity space, which is characterized in that further include being examined after repairing
Test step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910403167.5A CN110125607A (en) | 2018-09-30 | 2018-09-30 | Suitable for cheating the field repairing method of cavity space |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910403167.5A CN110125607A (en) | 2018-09-30 | 2018-09-30 | Suitable for cheating the field repairing method of cavity space |
| CN201811163163.6A CN108971883B (en) | 2018-09-30 | 2018-09-30 | Suitable for cheating the field repairing method of cavity space |
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| CN201811163163.6A Active CN108971883B (en) | 2018-09-30 | 2018-09-30 | Suitable for cheating the field repairing method of cavity space |
| CN201910407369.7A Active CN110052777B (en) | 2018-09-30 | 2018-09-30 | On-site repairing method suitable for pit cavity space |
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| CN201910407369.7A Active CN110052777B (en) | 2018-09-30 | 2018-09-30 | On-site repairing method suitable for pit cavity space |
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| CN111730239B (en) * | 2020-06-24 | 2022-06-10 | 浙江精工钢结构集团有限公司 | Steel structure butt welding robot welding process and welding line structure |
| CN116175079A (en) * | 2023-03-03 | 2023-05-30 | 中国核电工程有限公司 | Furnace tapping pipe repair system and method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110052777B (en) | 2020-03-20 |
| CN110052777A (en) | 2019-07-26 |
| CN108971883A (en) | 2018-12-11 |
| CN108971883B (en) | 2019-11-15 |
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Application publication date: 20190816 |