CN104263894B - A kind of local post weld heat treatment method of stub (tube) corner joint - Google Patents
A kind of local post weld heat treatment method of stub (tube) corner joint Download PDFInfo
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- CN104263894B CN104263894B CN201410403663.8A CN201410403663A CN104263894B CN 104263894 B CN104263894 B CN 104263894B CN 201410403663 A CN201410403663 A CN 201410403663A CN 104263894 B CN104263894 B CN 104263894B
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Abstract
<b>The present invention relates to a kind of local post weld heat treatment method of stub (tube) corner joint</b><b>, it comprises: centered by angle welding, arrange that power is on cylindrical shell</b><b>Q1</b><b>Heater and on stub (tube), arrange that power is</b><b>Q2</b><b>Heater,</b><b>Q1</b><b>Calculated by given post weld heat treatment technique and the heated perimeter of requirement,</b><b>Q2</b><b>Pass through formula</b><b>A</b><b>Calculate. Take the inventive method can diametrical connection joint</b><b>The side that heat output is larger is carried out quantitative heating power back-off, and the maximum temperature point of heating region is positioned in angle welding,</b><b>Effectively avoid heating region maximum temperature point deflecting angle weld seam, overcome the adverse effect of traditional post weld heat treatment technique butt joint performance, met post weld heat treatment technical requirement.</b>
Description
Technical field
The present invention relates to a kind of local post weld heat treatment method of stub (tube) corner joint, it is specially adapted to connectBase length is more than or equal to the post weld heat treatment of the stub (tube) corner joint of 5 times of its external diameters, or stub (tube)The post weld heat treatment of the stub (tube) corner joint being connected with external pipe.
Background technology
Post weld heat treatment is for eliminating welding point residual stress, the tissue that improves welding point and performanceA kind of heat treatment of carrying out, its general technological process is: thermocouple → layout heater → parcel is installedHeat-preservation cotton → setting heat treatment parameter → heat-treat.
Stub (tube) corner joint is one of common welding point form, when manufacture in factory generally with pressureContainer or pipeline carry out overall post weld heat treatment, but after being on active service when Site Welding (as repair), stub (tube)Link into an integrated entity with pressure container cylinder or pipeline, therefore can only carry out local heat treatmet to it. At thisWhile heating under the condition of kind, the heat transfer condition difference of angle welding both sides, causes the maximum temperature of heating region to be sent outRaw skew, even angle welding both sides constant power is arranged heater, the maximum temperature of heating region is position notBe in angle welding in the center of heater, but to the little direction skew of heat output. Side-play amount and skewThe maximum temperature reaching, with phases such as material category, size, environmental condition and post weld heat treatment technological parametersClose. When the maximum temperature of skew exceedes after material phase transformation temperature, the damage of material property will be caused, evenDirectly cause joint to be scrapped.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and a kind of improved connecing is providedBase corner joint post weld heat treatment method.
For solving above technical problem, the present invention takes following technical scheme:
A kind of local post weld heat treatment method of stub (tube) corner joint, corner joint comprise cylindrical shell, stub (tube),The angle welding that connects cylindrical shell and stub (tube), described post weld heat treatment method comprises: centered by angle welding,On cylindrical shell, arrange that power is the heater of Q1 and on stub (tube), arrange that power is the hot charging that adds of Q2Put, Q1 is calculated by given post weld heat treatment technique and the heated perimeter of requirement, and Q2 is by followingFormula A calculates:
In formula: K is heat transfer correction factor, be same temperature lower shell material thermal conductivity and stub (tube) material heatThe ratio of conductance;
δ 1 is cylindrical shell nominal wall thickness;
R1 is the radius of the heater arranged on cylindrical shell;
The nominal wall thickness that δ 2 is stub (tube);
W2 is the nominal outside diameter of stub (tube);
N2 is the nominal bore diameter of stub (tube).
According to further embodiment of the present invention, corner joint can be steel corner joint (cylindrical shell of the same raceIdentical with stub (tube) material) or dissimilar steel corner joint (cylindrical shell is different with stub (tube) material).
Preferably, stub (tube) length is more than or equal to 5 times of its external diameters, or stub (tube) with external pipe phaseConnect.
Heat transfer adjusted coefficient K is same temperature lower shell material thermal conductivity λ 1 and stub (tube) material thermal conductivityThe ratio of λ 2, in the time that ratio under different temperatures is different, heat-obtaining is processed initial temperature to thermostat temperatureAt multiple temperature, the mean value of ratio is as heat transfer correction factor.
Preferably, take flexible heating rope as heating element heater, on cylindrical shell with stub (tube) on the heating that is wound aroundThe length ratio of rope is identical with the ratio of heating power Q1 and Q2.
According to a concrete aspect of the present invention: the heater on cylindrical shell and on stub (tube) is that same addsHot loop is arranged 1 thermocouple, as the temperature-control heat couple of this heating circuit in angle welding. Enter oneStep ground, described method specifically comprises the steps:
(1), thermocouple is installed: 1 thermocouple is installed in angle welding, as the temperature control of heaterThermocouple;
(2), calculate the power Q1 that cylindrical shell heating needs: according to given post weld heat treatment technique and requirementHeated perimeter, calculate the power Q1 that cylindrical shell heating needs;
(3), calculate heat transfer adjusted coefficient K: when described cylinder material and described stub (tube) material are in differenceWhen thermal conductivity ratio at temperature is identical, calculate the thermal conductivity of cylinder material and stub (tube) at certain temperatureRatio is heat transfer adjusted coefficient K; When described cylinder material and described stub (tube) material are under different temperaturesThermal conductivity ratio when different, calculate from heat treatment initial temperature to thermostat temperature within the scope of multiple temperatureThe ratio of cylindrical shell and stub (tube) material thermal conductivity, then gets the mean value of these ratios and revises system as conducting heatNumber K;
(4), calculate according to formula A the power Q2 being arranged on stub (tube);
(5), arrange heating element heater: select flexible heating rope as heating element heater, on cylindrical shell and take overOn seat, be wound around respectively heating rope, and make to be distributed on cylindrical shell and stub (tube) on the power of heating rope be respectivelyQ1 and Q2;
(6), parcel heat-preservation cotton: at least cover within the scope of 300mm in heating rope overlay area and outside thereofLid heat-preservation cotton;
(7), under possible condition, shutoff stub (tube) pore;
(8), set heat treatment cycle curve, carry out post weld heat treatment.
According to another concrete aspect of the present invention, the heater on described cylindrical shell and stub (tube) is made as twoIndependently heating circuit is arranged 2 thermocouples in angle welding, respectively as the control of two heating circuitsWarm galvanic couple, while heat-treating, set described 2 thermocouples the temperature difference of synchronization 10 DEG C withIn. Described method specifically comprises the steps:
(1), thermocouple is installed: 2 thermocouples are installed in welded joints, respectively as two heatersTemperature-control heat couple;
(2), calculate the power Q1 that cylindrical shell heating needs: according to given post weld heat treatment technique and requirementHeated perimeter, calculate the power Q1 that cylindrical shell heating needs;
(3), calculate heat transfer adjusted coefficient K: when described cylinder material and described stub (tube) material are in differenceWhen thermal conductivity ratio at temperature is identical, calculate the thermal conductivity of cylinder material and stub (tube) at certain temperatureRatio is heat transfer adjusted coefficient K; When described cylinder material and described stub (tube) material are under different temperaturesThermal conductivity ratio when different, calculate from heat treatment initial temperature to thermostat temperature within the scope of multiple temperatureThe ratio of cylindrical shell and stub (tube) material thermal conductivity, then gets the mean value of these ratios and revises system as conducting heatNumber K;
(4), calculate according to formula A the power Q2 being arranged on stub (tube);
(5), arrange heater: select flexible heating rope as heating element heater, on cylindrical shell and take overOn seat, be wound around respectively heating rope, be distributed on cylindrical shell and stub (tube) on the power of heating rope be respectively Q1And Q2;
(6), parcel heat-preservation cotton: in heating element heater overlay area and outside at least within the scope of 300mm, coverLid heat-preservation cotton;
(7), under possible condition, shutoff stub (tube) pore;
(8), set post weld heat treatment process curve: set the temperature control curve of described 2 thermocouples, togetherThe temperature difference of one moment two thermocouples is in 10 DEG C;
(9), two heating circuits start heating simultaneously, carry out post weld heat treatment.
According to the present invention, no matter take a loop heating or take two loop heatings, all needHeating element heater and weld seam both sides heat affected zone are incubated, and two ends are incubated width, insulation layer thicknessSubstantially equal. Take engineering measure simultaneously, as close pipeline valve, shutoff stub (tube) or pipe end etc.,Eliminate or the interior Air Flow of minimizing pipeline.
In the present invention, given post weld heat treatment technique and the heated perimeter of requirement are for concrete stub (tube) angleJoint is known and definite. Come according to the heated perimeter of given post weld heat treatment technique and requirementThe power Q1 that calculating cylindrical shell heating needs belongs to general knowledge known in this field, does not describe in detail at this.
Due to the enforcement of above technical scheme, the present invention compared with prior art has the following advantages:
For corner joint, because the heat transfer condition of angle welding both sides is different, inventor's theory is groundStudy carefully with engineering practice and find, centered by angle welding, arrange the heat place of constant power heater in weld seam both sidesReason method causes the reason of joint damage to be: heating region maximum temperature point when heat treatment be notThe center of heater is in angle welding, but towards the little direction skew of heat output, the size of side-play amountAnd the maximum temperature of skew generation and concrete corner joint material composition, specification, environmental condition, welderingAfter-baking parameters etc. are relevant. The skew of maximum temperature, has worsened heating region temperature field characteristics, impactThe serviceability of joint and service life after heat treatment, the maximum temperature that particularly ought reach exceedes materialAfter transformation temperature, butt joint performance causes major injury, even causes joint to be scrapped. The inventive method basisThe difference of the heat transfer condition of angle welding both sides arranges corresponding heating condition, and the side that heat output is large is enteredRow quantitative heating power back-off, has effectively avoided heating region maximum temperature point to depart from weld seam, successfully overcomesThe adverse effect of traditional post weld heat treatment technique butt joint performance, meet joint post weld heat treatment technology wantAsk.
Brief description of the drawings
Accompanying drawing 1 has shown corner joint form of the present invention;
The partial schematic sectional view that accompanying drawing 2 is cylindrical shell of the present invention;
The cross-sectional schematic that accompanying drawing 3 is stub (tube) of the present invention;
Heater layout drawing when accompanying drawing 4 is supplied heating power for the present invention one loop;
Heater layout drawing when accompanying drawing 5 is supplied heating power for secondary circuit of the present invention;
Post weld heat treatment technological parameter curve map when accompanying drawing 6 is supplied heating power for the present invention one loop;
Post weld heat treatment technological parameter curve map when accompanying drawing 7 is supplied heating power for secondary circuit of the present invention;
Wherein:
01, stub (tube) corner joint;
1, cylindrical shell;
2, stub (tube);
3, angle welding;
11, the nominal wall thickness of cylindrical shell;
21, the nominal bore diameter of stub (tube);
22, the nominal outside diameter of stub (tube);
23, the nominal wall thickness of stub (tube);
24, the radius of the heater on cylindrical shell;
31, a heater when loop heating;
32, a temperature-control heat couple when loop heating;
41, heater on cylindrical shell when secondary circuit heats;
42, heater when secondary circuit heats on stub (tube);
43, the temperature-control heat couple of heater on cylindrical shell when secondary circuit heats;
The temperature-control heat couple of heater when 44, secondary circuit heats on stub (tube);
51, not temperature value in the same time of temperature-control heat couple 43;
52, not temperature value in the same time of temperature-control heat couple 44;
50, the temperature difference of synchronization temperature-control heat couple 43 and 44.
Detailed description of the invention
As shown in Figures 1 to 3, stub (tube) corner joint 01 of the present invention comprises cylindrical shell 1, stub (tube)2 and connect the angle welding 3 of cylindrical shell 1 and stub (tube) 2, wherein the length of stub (tube) 2 is more than or equal to outside it5 times, footpath, or stub (tube) 2 is connected with external pipe.
In the time adopting the diametrical connection joint post weld heat treatment of same loop, as shown in Figure 4, according to givenThe heated perimeter of post weld heat treatment technique and requirement, calculates the heating power Q1 needing on cylindrical shell 1. According toThermal conductivity under Technology for Heating Processing, cylindrical shell 1 and stub (tube) 3 different temperatures, calculates from the initial temperature of heat treatmentSpend to the ratio of multiple temperature lower shells 1 within the scope of thermostat temperature and stub (tube) 3 material thermal conductivities, thenGet the mean value of these ratios as heat transfer adjusted coefficient K. According to formula A, calculate on stub (tube) 2 and needThe heating power Q2 arranging.
Temperature-control heat couple 32 is arranged in angle welding 3, heating element heater 31 (heating rope) is arranged inOn cylindrical shell 1 centered by angle welding 3, stub (tube) 2. Be arranged in the power on cylindrical shell 1 and stub (tube) 2Be respectively Q1, Q2.
Set post weld heat treatment process curve by Fig. 6 and carry out post weld heat treatment. According to this curve, control automaticallyDevice processed is adjusted heating element heater output current. Because the heating element heater on cylindrical shell 1 and stub (tube) 2 is in sameOne loop, therefore the power of output increases in proportion or reduces, but will keep the ratio of Q1/Q2 constant,To ensure there is not mutual heat transfer between cylindrical shell 1 and stub (tube) 2, so, can ensure that weld seam locates all the timeIn heating region maximum temperature.
In the time adopting the post weld heat treatment of secondary circuit diametrical connection joint, as shown in Figure 5, according to given postweldingThe heated perimeter of Technology for Heating Processing and requirement, calculates the heating power Q1 needing on cylindrical shell. According to heat treatmentThermal conductivity under technique, cylindrical shell 1 and stub (tube) 3 different temperatures, calculates from heat treatment initial temperature to permanentIn temperature temperature range, the ratio of multiple temperature lower shells 1 and stub (tube) 3 material thermal conductivities, then gets theseThe mean value of ratio is as heat transfer adjusted coefficient K. According to formula A, calculate on stub (tube) 2 and need to arrangeHeating power Q2.
2 thermocouples 43,44 are set in angle welding 3, respectively as heater 41 on cylindrical shell 1,The temperature-control heat couple of the heater 42 on stub (tube) 2. By two groups of heating element heaters 41,42 (heating rope)Be arranged on cylindrical shell 1 centered by angle welding, stub (tube) 2. Be arranged in cylindrical shell 1 and stub (tube) 2On power be respectively Q1, Q2. The temperature difference 50 of setting 2 thermocouples of synchronization 43,44 is ± 10 DEG CIn, as shown in Figure 7. Although the heating element heater on cylindrical shell 1 and stub (tube) 2 is in different circuit,The temperature of synchronization temperature-control heat couple 43,44 differs in ± 10 DEG C, therefore cylindrical shell 1 and stub (tube) 2Between there is not mutual heat transfer, ensure weld seam all the time in heating region maximum temperature.
No matter adopt a circuit controls still to adopt secondary circuit control, all need heating element heater and outside thereofAt least 300mm region is incubated, and be incubated width everywhere, insulation layer thickness is substantially equal. Meanwhile,Adopt engineering measure, as close pipeline valve, obstruction stub (tube) port etc., eliminate or reduce in pipeline emptyAir-flow is moving.
Below in conjunction with specific embodiment, corner joint after welding treatment technique of the present invention is elaborated,But the invention is not restricted to following examples.
Embodiment 1
A certain pressure container cylinder material is BHW35, external diameter 1800mm, and wall thickness 95mm, has on itOne corner joint, joint stub (tube) material is 20G, specification is OD273 × 22 (mm). REPAIR WELDING workSkill requires this corner joint to be carried out to local post weld heat treatment, 600 DEG C of heat treatment thermostat temperatures, heating and cooling speed300 DEG C/h of degree, width of heating when heat treatment on cylindrical shell is 3 times of cylindrical shell wall thickness.
Adopt this corner joint of the inventive method docking base to carry out local post weld heat treatment, the concrete step of implementingRapid as follows:
(1) heating power calculates and selects
According to post weld heat treatment technological requirement, the minimum power that calculates heating needs on cylindrical shell is17kW. Centered by stub (tube) center, radius is in 273/2+285=422 (mm) scope, at cylinderWidth of heating on body is in 3 times of scopes of cylindrical shell wall thickness (285mm), can arrange 30kW heating rope,Consider the margin of power, select the heating rope of 30kW power as the heating element heater on cylindrical shell.
(2) calculate heat conduction correction factor
BHW35 is different from 20G steel thermal conductivity under different temperatures, calculates respectively BHW35 steel and 20GThe ratio of steel thermal conductivity at normal temperature, 100 DEG C, 200 DEG C, 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C is flatAll obtain afterwards adjusted coefficient K=0.83 of conducting heat.
(3) determine the heating power needing on stub (tube)
According to the specification of the specification of the heating power of arranging on cylindrical shell, cylindrical shell, stub (tube) and the correction system of conducting heatNumber, adopts formula A, and obtaining needing the heating power of layout on stub (tube) is 5kW.
(4) selection of control method: select a circuit controls.
(5) thermocouple is arranged: 1 thermocouple is installed in angle welding, as the temperature control of heating circuitThermocouple.
(6) heating element heater is arranged: by 30m heating rope (30kW power) be wrapped in taking angle welding asOn the BHW35 steel cylinder at center, winding radius is 273/2+285=422 (mm), and heated perimeter is cylinder3 times of wall thickness of body; 5m heating rope (5kW power) is wrapped in to 20G steel stub (tube) centered by angle weldingOn.
(7) insulation: heat-preserving range is heating rope winding scope and outside 500mm. Hold at pressure simultaneouslyDevice inside and the outside corresponding soak zones covering and heat insulating cotton of cylindrical shell.
(8), by given post weld heat treatment processing parameter setting post weld heat treatment process curve, startPost weld heat treatment.
In engineering, with temperature measuring device, the temperature survey of heating region is shown, take above-mentioned post weld heat treatment sideMethod, commissure temperature is heating region maximum temperature, meets joint post weld heat treatment technical requirement.
Embodiment 2
After having a stub (tube) angle welding reparation on certain vessel head, need local post weld heat treatment. End socket and adapterMaterial be 12Cr1MoVG, end socket external diameter 828mm, wall thickness 82mm; Stub (tube) external diameter 347mm,Wall thickness 40mm. Welding process requirement is carried out post weld heat treatment to this corner joint, and post weld heat treatment technique is wantedAsk 720 DEG C of thermostat temperatures, 75 DEG C/h of warming and cooling rate, width of heating is that 2 times of end socket wall thickness are 164mm.
Adopt this corner joint of the inventive method docking base to carry out local post weld heat treatment, concrete implementation stepAs follows:
(1) heating power calculates and selects
According to post weld heat treatment technological requirement, the minimum power that the heating of end socket side needs is 15.0kW, is connecingAround base, within the scope of 347/2+164=338mm,, in 2 times of heated perimeters of cylindrical shell wall thickness, can arrange30kW heats rope, considers the margin of power, selects the heating rope of 30kW as the heating element heater on end socket.
(2) determine heat conduction correction factor
End socket is identical with stub (tube) material, i.e. heat conduction adjusted coefficient K=1.
(3) determine the heating power needing on stub (tube)
According to the specification of the specification of the heating power of arranging on end socket, end socket, stub (tube) and heat transfer correction factor,Adopt formula A, obtaining needing the heating power of layout on stub (tube) is 14kW.
(4) select control method: select secondary circuit mode of heating.
(5) thermocouple is arranged: 2 thermocouples are installed in angle welding, respectively as two heating circuitsTemperature-control heat couple.
(6) heating element heater is arranged: by 30m heating rope (30kW power) be wrapped in taking angle welding as inOn the end socket of the heart, winding radius is 347/2+164=338 (mm), and heated perimeter is 2 times of wall thickness of end socket;14m heating rope (14kW power) is wrapped on the stub (tube) centered by angle welding.
(7) insulation: heat-preserving range is heating winding scope and outside 500mm thereof. Simultaneously in end socketThe whole covering and heat insulating cottons of wall, except preventing heat loss, also prevent the sky in stub (tube) pore and other poresAir-flow is moving.
(8) the temperature control curve of 2 temperature-control heat couple of setting: 2 suite lines are set and start heat time, literCooling rate, thermostat temperature and time etc. are all identical, ensure that 2 thermocouples of synchronization set the temperature difference and be less than10℃。
(9) post weld heat treatment: according to the post weld heat treatment process curve of setting, two loops start simultaneouslyCarry out post weld heat treatment.
In engineering, with temperature measuring device, the temperature survey of heating region is shown, take above-mentioned post weld heat treatment sideMethod, commissure temperature is heating region maximum temperature, meets joint post weld heat treatment technical requirement.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow is familiar with this skillThe personage of art can understand content of the present invention and implement according to this, can not limit protection model of the present invention with thisEnclose. All equivalences that Spirit Essence is done according to the present invention change or modify, and all should be encompassed in protection of the present inventionWithin scope.
Claims (9)
1. the local post weld heat treatment method of stub (tube) corner joint, described corner joint comprise cylindrical shell,Stub (tube), connect the angle welding of described cylindrical shell and described stub (tube), it is characterized in that described post weld heat treatmentMethod comprises: centered by described angle welding, on described cylindrical shell, arrange power be the heater of Q1 andOn described stub (tube), arrange that power is the heater of Q2, described Q1 by given post weld heat treatment technique andThe heated perimeter requiring calculates, and described Q2 calculates by following formula A:
In formula: K is heat transfer correction factor, be same temperature lower shell material thermal conductivity and stub (tube) material heatThe ratio of conductance;
The nominal wall thickness that δ 1 is cylindrical shell;
R1 is the radius of the heater arranged on cylindrical shell;
The nominal wall thickness that δ 2 is stub (tube);
W2 is the nominal outside diameter of stub (tube);
N2 is the nominal bore diameter of stub (tube).
2. the local post weld heat treatment method of stub (tube) corner joint according to claim 1, its feature existsIn: the length of described stub (tube) is more than or equal to 5 times of its external diameter, or described stub (tube) with external pipeConnect.
3. the local post weld heat treatment method of stub (tube) corner joint according to claim 1, its feature existsIn: described cylindrical shell and described stub (tube) are steel of the same race or are dissimilar steel.
4. the local post weld heat treatment method of stub (tube) corner joint according to claim 1, its feature existsIn: in the time that described cylinder material is different with the thermal conductivity ratio of described stub (tube) material under different temperatures, getHeat treatment initial temperature to the mean value of ratio at multiple temperature within the scope of thermostat temperature as described heat transfer correctionCoefficient.
5. the local post weld heat treatment method of stub (tube) corner joint according to claim 1, its feature existsIn: take flexible heating rope as heating element heater, on cylindrical shell with stub (tube) on the heating rope that is wound around length itThan identical with the ratio of heating power Q1 and Q2.
6. the local post weld heat treatment method of stub (tube) corner joint according to claim 1 or 5, its spyLevy and be: the heater on described cylindrical shell and on stub (tube) is same heating circuit, cloth in angle weldingPut 1 thermocouple, as the temperature-control heat couple of this heating circuit.
7. the local post weld heat treatment method of stub (tube) corner joint according to claim 6, its feature existsIn: described method specifically comprises the steps:
(1), thermocouple is installed: 1 thermocouple is installed in angle welding, as the temperature control heat of heaterGalvanic couple;
(2), calculate the power Q1 that cylindrical shell heating needs: according to given post weld heat treatment technique and requirementHeated perimeter, calculates the power Q1 that cylindrical shell heating needs;
(3), calculate heat transfer adjusted coefficient K: when described cylinder material and described stub (tube) material are in equality of temperature notWhen the lower thermal conductivity ratio of degree is identical, thermal conductivity and the ratio of stub (tube) at certain temperature of calculating cylinder materialBe heat transfer adjusted coefficient K; The thermal conductance under different temperatures when described cylinder material and described stub (tube) materialWhen rate ratio is different, calculate from heat treatment initial temperature to thermostat temperature within the scope of multiple temperature lower shells and connecingThe ratio of base material thermal conductivity, then gets the mean value of these ratios as heat transfer adjusted coefficient K;
(4), calculate according to formula A the power Q2 being arranged on stub (tube);
(5), arrange heating element heater: select flexible heating rope as heating element heater, on cylindrical shell and stub (tube)Above be wound around respectively heating rope, and make to be distributed on cylindrical shell and stub (tube) on the power of heating rope be respectively Q1 andQ2；
(6), parcel heat-preservation cotton: at least cover within the scope of 300mm and protect in heating rope overlay area and outside thereofWen Mian;
(7), under possible condition, shutoff stub (tube) pore;
(8), set heat treatment cycle curve, carry out post weld heat treatment.
8. the local post weld heat treatment method of stub (tube) corner joint according to claim 1 or 5, its spyLevy and be: the heater on described cylindrical shell and stub (tube) is made as two independently heating circuits, at described angleOn weld seam, arrange 2 thermocouples, as the temperature-control heat couple of described two heating circuits, carry out heat place respectivelyWhen reason, set described 2 thermocouples in the temperature difference of synchronization in 10 DEG C.
9. the local post weld heat treatment method of stub (tube) corner joint according to claim 8, its feature existsIn: described method specifically comprises the steps:
(1), thermocouple is installed: 2 thermocouples are installed in welded joints, respectively as two heatersTemperature-control heat couple;
(2), calculate the power Q1 that cylindrical shell heating needs: according to given post weld heat treatment technique and requirementHeated perimeter, calculates the power Q1 that cylindrical shell heating needs;
(3), calculate heat transfer adjusted coefficient K: when described cylinder material and described stub (tube) material are in equality of temperature notWhen the lower thermal conductivity ratio of degree is identical, thermal conductivity and the ratio of stub (tube) at certain temperature of calculating cylinder materialBe heat transfer adjusted coefficient K; The thermal conductance under different temperatures when described cylinder material and described stub (tube) materialWhen rate ratio is different, calculate from heat treatment initial temperature to thermostat temperature within the scope of multiple temperature lower shells and connecingThe ratio of base material thermal conductivity, then gets the mean value of these ratios as heat transfer adjusted coefficient K;
(4), calculate according to formula A the power Q2 being arranged on stub (tube);
(5), arrange heater: select flexible heating rope as heating element heater, on cylindrical shell and stub (tube)The upper heating rope of being wound around respectively, be distributed on cylindrical shell and stub (tube) on the power of heating rope be respectively Q1 and Q2;
(6), parcel heat-preservation cotton: at least cover within the scope of 300mm and protect in heating element heater overlay area and outsideWen Mian;
(7), under possible condition, shutoff stub (tube) pore;
(8), set post weld heat treatment process curve, set the temperature control curve of described 2 thermocouples, sameThe temperature difference of moment two thermocouples is in 10 DEG C;
(9), two heating circuits start heating simultaneously, carry out post weld heat treatment.
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| US4590346A (en) * | 1982-04-30 | 1986-05-20 | Hitachi, Ltd. | Method of heating piping arrangement and heating coil |
| US4694131A (en) * | 1984-05-31 | 1987-09-15 | Daiichi Koshuha Kogyo Kabushiki Kaisha | Induction heating method and apparatus for relieving residual stress in welded joint between main and branch pipes |
| US4687894A (en) * | 1985-05-29 | 1987-08-18 | Daiichi Koshuha Kogyo Kabushiki Kaisha | Induction heating method and apparatus for relieving residual stress in welded joints in pipe line |
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