CN104148840A - Pipe connecting base butt joint local post weld heat treatment method - Google Patents
Pipe connecting base butt joint local post weld heat treatment method Download PDFInfo
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- CN104148840A CN104148840A CN201410403336.2A CN201410403336A CN104148840A CN 104148840 A CN104148840 A CN 104148840A CN 201410403336 A CN201410403336 A CN 201410403336A CN 104148840 A CN104148840 A CN 104148840A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a pipe connecting base butt joint local post weld heat treatment method. An independent main heating device and an independent auxiliary heating device are adopted. Heating elements of the main heating device are symmetrically arranged at the two ends of a butt weld in an equal-power and equal-interval mode, wherein the interval between the heating elements at each end is equal to the length of a pipe connecting base. A temperature control thermal couple is arranged on the butt weld. A heat treatment curve is set according to given post weld heat treatment process parameters. Heating elements of the auxiliary heating device are distributed on a cylinder with a fillet weld as the center. A temperature control thermal couple is arranged on the fillet weld. The real-time temperature control temperature is 10 DEG C higher or lower than the real-time temperature of a pipeline at one end of the main heating device during heating. The method is suitable for local post weld heat treatment of pipe connecting base butt joints of various specifications and textures, and can effectively prevent the highest temperature point in a heating area from deflecting from the butt weld and meet the joint post weld heat treatment technical requirement.
Description
Technical field
The present invention relates to a kind of local post weld heat treatment method of stub (tube) banjo fixing butt jointing, it is specially adapted to be highly less than or equal to the local post weld heat treatment of banjo fixing butt jointing of the stub (tube) of 3 times of external diameters.
Background technology
Post weld heat treatment is a kind of heat treatment of carrying out for eliminating welding point residual stress, the tissue that improves welding point and performance, and its general technological process is: installation thermocouple → layout heater → setting heat treatment parameter → parcel heat-preservation cotton → heat-treat.
The cylindrical shell of pressure vessel, header etc. is generally manufactured and carries out bulk heat treatmet in manufactory, but the banjo fixing butt jointing that pressure vessel, header are connected with its cylindrical shell Outer Tube is being used Site Welding, when postwelding need to be heat-treated, can only carry out local post weld heat treatment.The cylindrical shell of this banjo fixing butt jointing one end Bonding pressure container, header etc., other end connecting pipe, there is significant difference in the radiating condition at two ends, the center that while therefore heating, the maximum temperature of heating region can depart from heater, the maximum temperature of side-play amount and skew is subject to the strong effect of the factors such as material category, specification, environmental condition, post weld heat treatment technique, and not having simple rule can follow.During prior heat treatment, at stub (tube) banjo fixing butt jointing, place installs after heater, according to given heat treatment cycle curve, process, wherein when heater is installed, can by angle welding end, arrange more power at stub (tube), to compensate this end thermal loss, the power of arranging more number with operating personnel's experience, determine, usually make maximum temperature point just in time not be positioned in butt weld.The skew of maximum temperature, worsened heat treatment temperature field, strengthened the residual stress of joint after heat treatment, butt joint serviceability and life-span have a negative impact, particularly the maximum temperature when skew surpasses after material phase transformation point, material generation recrystallization, butt joint performance causes major injury, even directly causes joint to be scrapped.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that overcomes existing empirical method, provides a kind of improved stub (tube) banjo fixing butt jointing local 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) banjo fixing butt jointing, stub (tube) banjo fixing butt jointing comprises stub (tube), pipeline, cylindrical shell, the butt weld of connecting tubes seat and pipeline, and the angle welding of connecting tubes seat and cylindrical shell, described heat treatment method adopts main heater and assisted heating device to dock base banjo fixing butt jointing to heat simultaneously, wherein:
Arranging of main heater is as follows:
Heating element heater constant power, etc. width be arranged symmetrically in the length that width that the two ends of butt weld and every end arrange equals stub (tube);
Temperature-control heat couple is arranged in butt weld;
Heat treatment cycle curve is by given post weld heat treatment processing parameter setting;
Arranging of assisted heating device is as follows:
Heating element heater is arranged on cylindrical shell centered by angle welding;
Temperature-control heat couple is arranged in angle welding;
Real time temperature ± 10 ℃ when control temperature is main heater heating in real time on its end pipeline.
Preferably, the length that the present invention is specially adapted to stub (tube) is less than or equal to 3 times of its external diameter.
According to the present invention, stub (tube) and pipeline can be same material or different materials, for example, can be steel of the same race or dissimilar steel.
According to the present invention, the specification of stub (tube) and pipeline can be identical or different.
According to further embodiment of the present invention: described method comprises the steps:
(1), thermocouple is installed: 1 thermocouple is installed in stub (tube) butt weld, as the temperature-control heat couple of main heater; On the pipeline of main heater end, 1 thermocouple is set, as end temperature thermocouple; 1 thermocouple is installed in stub (tube) angle welding, as the temperature-control heat couple of assisted heating device;
(2), main heater is installed: select flexible heating rope or heating plate as heating element heater, centered by butt weld, butt weld two ends constant power, etc. width be arranged symmetrically with heating element heater, and the width of every end heating element heater equals stub (tube) length;
(3), assisted heating device is installed: select flexible heating rope or heating plate as heating element heater, centered by angle welding, on cylindrical shell, arrange heating element heater;
(4), set main heater heat treatment cycle curve;
(5), set assisted heating device control temperature: by the temperature-control heat couple cut-in temperature control appliance of the end temperature thermocouple of main heater and assisted heating device, real time temperature ± 10 ℃ that setting end temperature thermocouple records are the real-time control temperature of assisted heating device;
(6), covering and heat insulating is cotton: in main heater and assisted heating device place and outside thereof, at least covering and heat insulating is cotton within the scope of 300mm;
(7), blocking pipe port under possible condition;
(8), main heater and assisted heating device start heating simultaneously.
According to the present invention, " given post weld heat treatment technological parameter " is known and definite for concrete stub (tube) banjo fixing butt jointing.
Due to the enforcement of above technical scheme, the present invention compared with prior art has the following advantages:
For stub (tube) banjo fixing butt jointing, the cylindrical shell large with heat dissipation capacity because of butt weld one end is connected, the other end is connected with pipeline, the heat transfer condition at weld seam two ends is different, inventor's theoretical research and engineering practice are found, traditional arranges that at weld seam two ends unequal power the heat treatment method of heater causes the reason of joint damage to be: heating region Temperature Distribution during heat treatment is subject to joint design, material, environmental factor, the impact of Technology for Heating Processing, maximum temperature point position is difficult to accurately determine, it is the center that the maximum temperature of heating region is not positioned at heater, but to the little direction skew of heat output.The skew of maximum temperature, worsened heating region temperature field characteristics, affected serviceability and the service life of joint after heat treatment, particularly when the maximum temperature that skew reaches surpasses after the transformation temperature of material, butt joint performance causes major injury, even causes joint to be scrapped.The inventive method arranges corresponding main heater and assisted heating device according to the difference of weld seam two ends heat transfer condition, by assisted heating device, real time temperature control is carried out in the large stub (tube) one end of heat output, and this temperature is identical or close with the temperature on the pipeline of main heater end, this just makes butt weld two ends temperature symmetrical, simply and effectively avoided heating region maximum temperature point to depart from weld seam, avoided the asymmetric additional stress causing in temperature field, weld seam two ends, overcome the adverse effect of traditional empirical method, meet joint post weld heat treatment specification requirement.In addition, no matter whether the material of the inventive method stub (tube) and pipeline and specification be identical, all applicable.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that has shown stub (tube) banjo fixing butt jointing;
Fig. 2 has shown the main heater of stub (tube) banjo fixing butt jointing and upper layout thereof and the schematic diagram of assisted heating device;
Fig. 3 is the schematic diagram of the post weld heat treatment curve that has shown main heater, main heater end thermocouple real time temperature curve and the real-time temperature control curve of assisted heating device;
Wherein:
01, stub (tube) banjo fixing butt jointing;
1, stub (tube);
2, pipeline;
3, cylindrical shell;
11, butt weld;
12, angle welding;
20, main heater temperature-control heat couple;
21, main heater;
22, main heater end temperature thermocouple;
23, the end of main heater on pipeline;
31, assisted heating device;
32, assisted heating device temperature-control heat couple;
41, main heater heat treatment cycle curve;
42, the real time temperature curve that main heater end temperature thermocouple records;
43, assisted heating device temperature thermocouple real time temperature is controlled curve;
50, Temperature-controlled appliance;
H, stub (tube) length.
The specific embodiment
As depicted in figs. 1 and 2, stub (tube) banjo fixing butt jointing 01 comprises the butt weld 11 that stub (tube) 1, pipeline 2, cylindrical shell 3, stub (tube) 1 and pipeline 2 are connected, the angle welding 12 that stub (tube) 1 is connected with cylindrical shell 3.
The present invention relates to the method that banjo fixing butt jointing 01 is carried out to post weld heat treatment, its be by the heating element heater of main heater 21 (heating rope, heating plate etc.) constant power, etc. width be arranged symmetrically in the two ends of butt weld 11, and the layout width of every end equals the length H of stub (tube) 1.In butt weld 11, arrange 1 thermocouple, as the temperature-control heat couple 20 of main heater 21.On main heater 21 end 23 place's pipelines, 1 thermocouple is set, as main heater 21 end temperature thermocouples 22; Centered by angle welding 12, the heating element heater of assisted heating device 31 (heating rope, heating plate etc.) is arranged on cylindrical shell 3,1 thermocouple is set in angle welding 12, as the temperature-control heat couple 32 of assisted heating device 31.
By the temperature-control heat couple of the end temperature thermocouple 22 of main heater 21 and assisted heating device 31 32 cut-in temperature control appliances 50, setting real time temperature ± 10 that end temperature thermocouple 22 records ℃ 42 is the real-time control temperature 43 of assisted heating device 31.
As shown in Figure 3, main heater 21 heat treatment cycle curves 41 are by given post weld heat treatment technique initialization.The curve setting of real time temperature ± 10 that the heat treatment cycle curve of assisted heating device 31 records by end temperature thermocouple 22 ℃.
Main heater 21 and assisted heating device 31 start heating simultaneously.
During heating need to main heater 21 and assisted heating device 31 and outside thereof at least within the scope of 300mm heat affected zone be incubated, adopt engineering measure simultaneously, as close pipeline valve, blocking pipe port etc., eliminate or reduce Air Flow in pipeline.
Below in conjunction with specific embodiment, stub (tube) banjo fixing butt jointing after welding treatment technique of the present invention is elaborated, but the invention is not restricted to following examples.
Embodiment 1
On certain shell, there is a stub (tube) to carry out Replacement and Repair, after repairing, require docking base banjo fixing butt jointing to carry out post weld heat treatment.Shell material is 16MnNiMo, and specification is OD 1600 * 117 (mm), and stub (tube) material is 20G, and stub (tube) specification is OD371 * 75 (mm), stub (tube) length 150mm; Pipeline material is 20G, and specification is OD355 * 67 (mm).Given post weld heat treatment technological parameter is: 600 ℃ of thermostat temperatures, constant temperature time 3.0h, 80 ℃/h of warming and cooling rate.
Adopt the inventive method to carry out post weld heat treatment to this stub (tube) banjo fixing butt jointing, concrete implementation step is as follows:
(1), arrange thermocouple: in butt weld, arrange 1 thermocouple, as main heater temperature-control heat couple; On the pipeline at elongation weld seam 300mm place, on the pipeline of main heater end, arrange 1 thermocouple, as main heater end temperature thermocouple; In angle welding, arrange 1 thermocouple, as assisted heating device temperature-control heat couple.
(2), arrange main heater: adopt rope form heater, centered by butt weld, upper and lower constant power, etc. the symmetrical heating rope that is wound around of width, and upper and lower winding width is 150mm.Due to stub (tube) and outer diameter tube not etc., be wrapped in heating rope on stub (tube) and than the heating rope on pipeline, arrange slightly thinly, but guarantee that both winding width equate.
(3), arrange assisted heating device: adopt arc-shaped flaky heater, centered by angle welding, on shell, arrange heating plate, as assisted heating device.
(4), by the given main heater heat treatment cycle curve of post weld heat treatment processing parameter setting.
(5), set assisted heating device heat treatment cycle curve: main heater end temperature thermocouple, assisted heating device temperature-control heat couple are accessed to a Temperature-controlled appliance, and the real-time control temperature of setting assisted heating device is temperature-10 ℃ that main heater end temperature thermocouple records in real time.
(6), eliminate or reduce pipeline air and flow: at internal tank, with the heat-preservation cotton obstruction stub (tube) mouth of pipe, to eliminate the Air Flow in pipeline.
(7), heat affected zone insulation: heat-preserving range is heating element heater coverage and outside 500mm, cotton at internal tank respective regions also covering and heat insulating.
(8), main heater, assisted heating device start heating simultaneously.
During engineering construction, with temperature measuring equipment, the temperature survey of heating region is shown, take said method to carry out post weld heat treatment, butt weld place temperature is heating region maximum temperature, meets joint post weld heat treatment specification requirement.
Embodiment 2
The cylinder material of certain boiler header is 10CrMo910 steel, specification is φ 610 * 32 (mm), stub (tube) material is P22 steel, stub (tube) specification is OD273 * 22 (mm), stub (tube) length 100mm, the pipeline material being connected with stub (tube) is P22 steel, and specification is OD273 * 18 (mm).Welding process requirement is carried out post weld heat treatment to this stub (tube) banjo fixing butt jointing.Given post weld heat treatment technological parameter is: 720 ℃ of thermostat temperatures, constant temperature time 1.5h, 300 ℃/h of warming and cooling rate.
Adopt the inventive method to carry out post weld heat treatment to this stub (tube) banjo fixing butt jointing, concrete implementation step is as follows:
(1), arrange thermocouple: in butt weld, arrange 1 thermocouple, as main heater temperature-control heat couple; On the pipeline at elongation weld seam 200mm place, 1 thermocouple is arranged in main heater end, as main heater end temperature thermocouple; In angle welding, arrange 1 thermocouple, as assisted heating device temperature-control heat couple.
(2) arrange main heater: adopt rope form heater, centered by butt weld, both sides constant power, etc. the symmetrical heating rope that is wound around of width, and both sides winding width is stub (tube) length 100mm.
(3) arrange assisted heating device: adopt rope form heater, centered by angle welding, on header cylindrical shell, be wound around heating rope.
(4) by the given main heater heat treatment cycle curve of post weld heat treatment processing parameter setting.
(5) set assisted heating device heat treatment cycle curve: main heater end temperature thermocouple, assisted heating device temperature-control heat couple are accessed to a Temperature-controlled appliance, and the real-time control temperature of setting assisted heating device is the temperature that main heater end temperature thermocouple records in real time.
(6), heat affected zone insulation: heat-preserving range is heating element heater coverage and outside 300mm thereof, and insulation layer thickness equates everywhere.
(7) main heater, assisted heating device start heating simultaneously.
During engineering construction, with temperature measuring equipment, the temperature survey of heating region is shown, take said method to carry out post weld heat treatment, butt weld place temperature is heating region maximum temperature, meets joint post weld heat treatment specification requirement.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (7)
1. the local post weld heat treatment method of a stub (tube) banjo fixing butt jointing, described stub (tube) banjo fixing butt jointing comprises stub (tube), pipeline, cylindrical shell, connect the butt weld of described stub (tube) and described pipeline, and the angle welding that connects described stub (tube) and described cylindrical shell, it is characterized in that, described heat treatment method adopts main heater and assisted heating device described stub (tube) banjo fixing butt jointing to be heated simultaneously, wherein:
Arranging of described main heater is as follows:
Heating element heater constant power, etc. width be arranged symmetrically in the length that width that the two ends of described butt weld and every end arrange equals stub (tube);
Temperature-control heat couple is arranged in described butt weld;
Heat treatment cycle curve is by given post weld heat treatment processing parameter setting;
Arranging of described assisted heating device is as follows:
Heating element heater is arranged on described cylindrical shell centered by described angle welding;
Temperature-control heat couple is arranged in described angle welding;
Real time temperature ± 10 ℃ when control temperature is main heater heating in real time on its end pipeline.
2. the local post weld heat treatment method of stub (tube) banjo fixing butt jointing according to claim 1, it is characterized in that: on the pipeline of main heater end, 1 thermocouple is set, as main heater end temperature thermocouple, by the temperature-control heat couple cut-in temperature control appliance of this end temperature thermocouple and described assisted heating device, setting real time temperature ± 10 ℃ that described end temperature thermocouple records is the real-time control temperature of assisted heating device.
3. the local post weld heat treatment method of stub (tube) banjo fixing butt jointing according to claim 2, is characterized in that: the real-time control temperature that to set real time temperature that described end temperature thermocouple records be assisted heating device.
4. the local post weld heat treatment method of stub (tube) banjo fixing butt jointing according to claim 1, is characterized in that, the length of described stub (tube) is less than or equal to 3 times of its external diameter.
5. the local post weld heat treatment method of stub (tube) banjo fixing butt jointing according to claim 1, is characterized in that, described stub (tube) and pipeline are steel of the same race or dissimilar steel.
6. the local post weld heat treatment method of stub (tube) banjo fixing butt jointing according to claim 1, is characterized in that: described stub (tube) and the specification of pipeline are identical or different.
7. the local post weld heat treatment method of stub (tube) banjo fixing butt jointing claimed in claim 1, is characterized in that, described method comprises the steps:
(1), thermocouple is installed: 1 thermocouple is installed in stub (tube) butt weld, as the temperature-control heat couple of main heater; On the pipeline of main heater end, 1 thermocouple is set, as end temperature thermocouple; 1 thermocouple is installed in stub (tube) angle welding, as the temperature-control heat couple of assisted heating device;
(2), main heater is installed: select flexible heating rope or heating plate as heating element heater, centered by butt weld, butt weld two ends constant power, etc. width be arranged symmetrically with heating element heater, and the width of the heating element heater arranged of every end equals stub (tube) length;
(3), assisted heating device is installed: select flexible heating rope or heating plate as heating element heater, centered by angle welding, on cylindrical shell, arrange heating element heater;
(4), set main heater heat treatment cycle curve;
(5), set assisted heating device control temperature: by the temperature-control heat couple cut-in temperature control appliance of the end temperature thermocouple of main heater and assisted heating device, real time temperature ± 10 ℃ that setting end temperature thermocouple records are the real-time control temperature of assisted heating device;
(6), covering and heat insulating is cotton: in main heater and assisted heating device place and outside thereof, at least covering and heat insulating is cotton within the scope of 300mm;
(7), blocking pipe port under possible condition;
(8), main heater and assisted heating device start heating simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410403336.2A CN104148840B (en) | 2014-08-15 | 2014-08-15 | A kind of stub (tube) banjo fixing butt jointing local post weld heat treatment method |
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| CN201410403336.2A CN104148840B (en) | 2014-08-15 | 2014-08-15 | A kind of stub (tube) banjo fixing butt jointing local post weld heat treatment method |
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| CN104148840B CN104148840B (en) | 2016-08-10 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104561510A (en) * | 2015-01-07 | 2015-04-29 | 中国神华能源股份有限公司 | Heating structure of corner weld for pipeline connection |
| CN104625509A (en) * | 2015-01-07 | 2015-05-20 | 中国神华能源股份有限公司 | Method for heating pipeline connecting fillet weld |
| CN106180987A (en) * | 2016-08-23 | 2016-12-07 | 郑州荣奇热电能源有限公司 | A kind of high temperature superheater imports and exports header restorative procedure |
| CN108085473A (en) * | 2017-11-23 | 2018-05-29 | 四川中电福溪电力开发有限公司 | One kind is used for cylinder groove heat treatment on spot device |
| CN108517398A (en) * | 2018-06-26 | 2018-09-11 | 安徽马钢设备检修有限公司 | A kind of Large Diameter Pipeline thin-wall tube post weld heat treatment device and its application method |
| CN115948647A (en) * | 2023-02-10 | 2023-04-11 | 中建五洲工程装备有限公司 | Heat treatment equipment for on-site butt weld of U rib of steel box girder top plate |
| CN116287657A (en) * | 2023-02-03 | 2023-06-23 | 山东京博装备制造安装有限公司 | Large-scale earthing tank sectional heat treatment device and process |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561510A (en) * | 2015-01-07 | 2015-04-29 | 中国神华能源股份有限公司 | Heating structure of corner weld for pipeline connection |
| CN104625509A (en) * | 2015-01-07 | 2015-05-20 | 中国神华能源股份有限公司 | Method for heating pipeline connecting fillet weld |
| CN106180987A (en) * | 2016-08-23 | 2016-12-07 | 郑州荣奇热电能源有限公司 | A kind of high temperature superheater imports and exports header restorative procedure |
| CN108085473A (en) * | 2017-11-23 | 2018-05-29 | 四川中电福溪电力开发有限公司 | One kind is used for cylinder groove heat treatment on spot device |
| CN108517398A (en) * | 2018-06-26 | 2018-09-11 | 安徽马钢设备检修有限公司 | A kind of Large Diameter Pipeline thin-wall tube post weld heat treatment device and its application method |
| CN108517398B (en) * | 2018-06-26 | 2023-10-27 | 安徽马钢设备检修有限公司 | Post-welding heat treatment device for large-pipe-diameter thin-wall pipe and use method thereof |
| CN116287657A (en) * | 2023-02-03 | 2023-06-23 | 山东京博装备制造安装有限公司 | Large-scale earthing tank sectional heat treatment device and process |
| CN116287657B (en) * | 2023-02-03 | 2023-12-08 | 山东京博装备制造安装有限公司 | Large-scale earthing tank sectional heat treatment device and process |
| CN115948647A (en) * | 2023-02-10 | 2023-04-11 | 中建五洲工程装备有限公司 | Heat treatment equipment for on-site butt weld of U rib of steel box girder top plate |
| CN115948647B (en) * | 2023-02-10 | 2023-07-18 | 中建五洲工程装备有限公司 | Heat treatment equipment for on-site butt welding seam of U rib of top plate of steel box girder |
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| CN104148840B (en) | 2016-08-10 |
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