CN104131148B - A kind of threeway supervisor's banjo fixing butt jointing local post weld heat treatment method - Google Patents
A kind of threeway supervisor's banjo fixing butt jointing local post weld heat treatment method Download PDFInfo
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- CN104131148B CN104131148B CN201410403195.4A CN201410403195A CN104131148B CN 104131148 B CN104131148 B CN 104131148B CN 201410403195 A CN201410403195 A CN 201410403195A CN 104131148 B CN104131148 B CN 104131148B
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Abstract
The present invention relates to a kind of threeway supervisor's banjo fixing butt jointing local post weld heat treatment method, it adopts main heater and assisted heating device to heat simultaneously, the heating element heater constant power of main heater, equal in width are arranged symmetrically in the two ends of described weld seam, temperature-control heat couple is arranged in the side relative with side, arm place of weld seam, and heat treatment cycle curve is by given post weld heat treatment processing parameter setting; The heating element heater of assisted heating device is arranged against main heater main tube end, temperature-control heat couple is arranged in the upper position relative with threeway shoulder summit of main heater end supervisor, real time temperature �� 10 DEG C of position relative with threeway shoulder summit on its end pipeline when real-time control temperature is main heating devices heat. The inventive method effectively prevent heating region maximum temperature point deviation weld seam, reduces the circumferential temperature difference of weld seam, meets joint post weld heat treatment technology requirement.
Description
Technical field
The present invention relates to a kind of threeway supervisor's banjo fixing butt jointing local post weld heat treatment method, it is particularly well-suited to the local post weld heat treatment of threeway supervisor's banjo fixing butt jointing that arm has been connected with external pipe.
Background technology
Post weld heat treatment is a kind of heat treatment carried out for eliminating welding point residual stress, the tissue improving welding point and performance, and its general technological process is: installation thermocouple �� layout heater �� setting heat treatment parameter �� parcel heat-preservation cotton �� carry out heat treatment.
Threeway is the important connection member of piping, when scene needs to carry out post weld heat treatment after welding with external pipe under arms, is typically only capable to carry out local post weld heat treatment. This banjo fixing butt jointing one end connects external pipe, other end connecting tee, therefore there is significant difference in the radiating condition at weld seam two ends, if centered by weld seam, constant power arranges heater during heating, then the maximum temperature of heating region can deviate the center of heater, namely deviates weld seam. The maximum temperature of side-play amount and skew being affected strongly by the factors such as threeway material category, specification, environmental condition, post weld heat treatment technique, and simple rule can not followed; The shoulder of threeway simultaneously and abdominal part heat transfer there is also difference, cause that weld seam is except existing except the vertical temperature difference of supervisor, there is also the circumferential temperature difference along weld seam. Traditionally during this joint heat treatment, arranging more power at Zhi Guanduan, to compensate this end thermal loss, the watt levels arranged rule of thumb determine more. This method by virtue of experience usually makes maximum temperature point can not be placed exactly on weld seam. The skew of maximum temperature and the existence of the circumference temperature difference, the temperature field of the joint post weld heat treatment of deterioration, increase the residual stress of joint after heat treatment, and butt joint serviceability and life-span have a negative impact; After the maximum temperature of skew exceedes material phase transformation point, material generation recrystallization, butt joint performance causes major injury, even directly results in joint and scraps.
Summary of the invention
The technical problem to be solved is the deficiency overcoming existing empirical method, it is provided that a kind of threeway supervisor's banjo fixing butt jointing local post weld heat treatment method of improvement.
For solving above technical problem, the present invention adopts the following technical scheme that:
A kind of threeway supervisor's banjo fixing butt jointing local post weld heat treatment method, threeway supervisor's banjo fixing butt jointing includes the threeway being made up of supervisor and arm, pipeline, connect the weld seam of supervisor and pipeline, described post weld heat treatment method adopts main heater and assisted heating device threeway to be responsible for banjo fixing butt jointing simultaneously and is heated, wherein:
Being provided that of main heater
Heating element heater constant power, equal in width are arranged symmetrically in the two ends of described weld seam;
Temperature-control heat couple is arranged in the side relative with side, arm place of weld seam;
Heat treatment cycle curve is by given post weld heat treatment processing parameter setting;
Being provided that of described assisted heating device
Heating element heater is arranged against main heater main tube end;
Temperature-control heat couple is arranged in the upper position relative with threeway shoulder summit of main heater end supervisor;
Real time temperature �� 10 DEG C of position relative with threeway shoulder summit on its end pipeline when real-time control temperature is main heating devices heat;
Main heater and assisted heating device start simultaneously at heating.
Further, on the pipeline of main heater end, the position relative with threeway shoulder summit arranges 1 thermocouple, as main heater end temperature thermocouple, the temperature-control heat couple of this end temperature thermocouple with assisted heating device is accessed input temp can be converted into the Temperature-controlled appliance controlling temperature, set the real-time control temperature that real time temperature �� 10 DEG C are assisted heating device that end temperature thermocouple records.
Preferably, real time temperature that end temperature thermocouple the records real-time control temperature as assisted heating device is set.
Preferably, on the same line, and this straight line is parallel with the axis of supervisor the position of the temperature-control heat couple of described assisted heating device, the position of described main heater end temperature thermocouple, described threeway shoulder summit.
Preferably, the arm of described threeway welds with external pipe.
According to the present invention, described threeway and the material of pipeline may be the same or different, and namely threeway and pipeline are steel of the same race or dissimilar steel. The specification of supervisor and pipeline can be identical or different.
A specific aspect according to the present invention, described method comprises the steps:
(1), thermocouple is installed: 1 thermocouple is installed on a side position relative with side, described arm place of weld seam, as the temperature-control heat couple of main heater; Arrange 2 thermocouples at the two ends of the main heater relative with threeway shoulder summit, wherein the thermocouple by pipe end is main heater end temperature thermocouple, and the thermocouple by main tube end is assisted heating device temperature-control heat couple;
(2), installing main heater: select flexible heater rope or heating plate as heating element heater, centered by weld seam, weld seam two ends constant power, equal in width are arranged symmetrically with main heater, arrange that width is determined according to post weld heat treatment technological requirement;
(3), installing assisted heating device: select flexible heater rope or heating plate as heating element heater, arrange heating element heater against main heater main tube end, heating element heater is all arranged in be responsible for above or when its limited space, is partially disposed on arm;
(4), main heater heat treatment cycle curve is set;
(5), assisted heating device control temperature is set: main heater end temperature thermocouple and assisted heating device temperature-control heat couple cut-in temperature are controlled equipment, sets the real-time control temperature that real time temperature �� 10 DEG C are assisted heating device that main heater end temperature thermocouple records;
(6), covering and heat insulating is cotton: within the scope of main heater and assisted heating device and outside at least 300mm thereof, covering and heat insulating is cotton;
(7), the possible valve on stopped pipe road, condition ShiShimonoseki, blocking pipe port;
(8), main heater and assisted heating device start simultaneously at heating.
According to the present invention, threeway shoulder summit is arm and the point on supervisor junction, and threeway shoulder summit has 2, and the straight line at this place, 2 threeway shoulder summits is parallel with the axis of supervisor. Present invention process is mainly applied in engineering. Should be understood that and so-called " point " herein can not limit to " point " that be interpreted as in mathematical meaning, but include a range of position centered by " point ".
Additionally, in the present invention, two positions refer to that the two position is substantially on a vertical line or horizontal line relatively.
Due to the enforcement of above technical scheme, the present invention compared with prior art has the advantage that
Banjo fixing butt jointing is responsible for for threeway, because weld seam one end is connected with pipeline, the threeway that the other end is big with heat dissipation capacity is connected, the heat transfer condition at weld seam two ends is different, inventor's theoretical research finds with engineering practice, at weld seam two ends constant power, traditional arranges that the reason that the heat treatment method of heater causes thermal treatment quality bad is in that: owing to weld seam two ends heat transfer condition is different, when constant power arranges heater, maximum temperature is not at the center of heater, but offset to the pipe end that heat output is little, side-play amount is subject to three-port structure, material, environmental factors, the impact of Technology for Heating Processing, maximum temperature point position is difficult to simply and accurately determine, additionally, due to by the impact of arm, weld seam, except existing except the vertical temperature difference of supervisor, there is also the circumference temperature difference. the skew of maximum temperature and the existence of the circumference temperature difference, it is degrading heating region temperature field characteristics, increases joint residual stress after heat treatment, after the maximum temperature particularly reached when skew exceedes the transformation temperature of material, butt joint performance causes major injury, even results in joint and scraps. 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, threeway one end that heat output is big being carried out real time temperature control, the control temperature of assisted heating device is taken from the real time temperature on the main heater other end and pipeline. the layout of this heater and the control mode of temperature, make the full symmetric distribution of temperature of weld seam two ends, and not by the impact of three-port structure, material, post weld heat treatment technique etc., simple and effectively prevent heating region maximum temperature point deviation weld seam and the existence of the circumference temperature difference, avoid the asymmetric additional stress caused in welding temperature field, two ends, overcome the adverse effect of Conventional wisdom method, meet joint post weld heat treatment technology requirement.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of threeway supervisor's banjo fixing butt jointing;
Fig. 2 is for showing supervisor bottom and threeway shoulder vertex position, the schematic diagram of main heater and temperature-control heat couple, temperature thermocouple position, end;
Fig. 3 is main heater, assisted heating device and Temperature-controlled appliance connection diagram thereof;
Fig. 4 shows the post weld heat treatment curve of main heater, main heater end thermocouple real time temperature curve and assisted heating device real time temperature controlling curve;
Wherein:
01, threeway supervisor banjo fixing butt jointing;
1, supervisor;
2, arm;
3, pipeline;
11, weld seam;
12, threeway shoulder summit;
13, supervisor bottom;
20, the temperature-control heat couple of main heater;
21, main heater;
22, main heater end temperature thermocouple;
23, the position being connected with supervisor bottom of weld seam;
24, position relative with threeway shoulder summit on main heater pipe end;
25, position relative with threeway shoulder summit on main heater main tube end;
31, assisted heating device;
32, the temperature-control heat couple of assisted heating device;
41, main heater heat treatment cycle curve;
42, the real time temperature curve that main heater end temperature thermocouple records;
43, the real-time temperature control curve of assisted heating device temperature thermocouple;
50, Temperature-controlled appliance.
Detailed description of the invention
As shown in Figures 1 to 4, threeway supervisor banjo fixing butt jointing 01 includes the weld seam 11 of the threeway, pipeline 3, connection supervisor 1 and the pipeline 3 that are made up of supervisor 1 and arm 2. When threeway being responsible for banjo fixing butt jointing 01 and carrying out post weld heat treatment, main heater 21 (heating rope, heating plate etc.) constant power, equal in width are arranged symmetrically in the two ends, left and right of weld seam 11, and the layout width often held is determined according to the requirement of post weld heat treatment technique. 1 thermocouple is arranged, as the temperature-control heat couple 20 of main heater 21 in the side relative with side, arm 1 place (position 23 that namely in figure, weld seam 11 is connected with supervisor bottom 13) of weld seam 11. Arranging 2 thermocouples at main heater 21 two ends relative with threeway shoulder summit 12, wherein the thermocouple by pipe end 24 is main heater end temperature thermocouple 22, and the thermocouple by main tube end 25 is assisted heating device temperature-control heat couple 32. Arranging assisted heating device 31 at main heater 21 by main tube end, assisted heating device 31 is arranged on supervisor 2, when limited space, is partially disposed on arm 2.
Main heater end temperature thermocouple 22 and assisted heating device temperature-control heat couple 32 cut-in temperature are controlled equipment 50, sets the real-time control temperature that real time temperature �� 10 DEG C are assisted heating device 31 that end temperature thermocouple 22 records.
Main heater 21 heat treatment cycle curve 41 is by given post weld heat treatment technique initialization.
Main heater 21 and assisted heating device 31 start simultaneously at heating.
Need during heating heat affected zone within the scope of main heater 21 and assisted heating device 31 and outside at least 300mm thereof is incubated, adopt engineering measure simultaneously, such as blocking pipe end, close pipeline valve etc., eliminate or reduce the flowing of threeway inner air.
Below in conjunction with specific embodiment, the threeway of the present invention is responsible for banjo fixing butt jointing after welding treatment technique to be described in detail, but the invention is not restricted to following example.
Embodiment 1
Certain pressure pipeline has one 45 �� of oblique Y-site, material is 12Cr2Mo1G, supervisor's specification is OD660 �� 85.34 (mm), arm specification is OD457 �� 64.30 (mm), supervisor's banjo fixing butt jointing is to tee branch step place 175mm, the pipeline material being connected with supervisor is P22, and specification is OD650 �� 80.0 (mm). Arm all welds with external pipe with supervisor. Supervisor's welding point is carried out post weld heat treatment by welding process requirement, the width of heating of post weld heat treatment is 2 times of every side, weld seam both sides supervisor's wall thickness, given post weld heat treatment technological parameter is: thermostat temperature 740 DEG C, constant temperature time 4.0h, 75 DEG C/h of warming and cooling rate.
Adopt the inventive method that this supervisor's banjo fixing butt jointing is carried out local post weld heat treatment, be embodied as step as follows:
(1) thermocouple is arranged: at 1 thermocouple of location arrangements being connected with supervisor bottom of weld seam, as main heater temperature-control heat couple; Supervisor from each 170mm place, weld seam left and right and pipeline respectively arrange 1 thermocouple, and thermocouple is respectively positioned on the position relative with threeway shoulder summit. Wherein 1 thermocouple on pipeline is main heater end temperature thermocouple, and 1 thermocouple on supervisor is assisted heating device temperature-control heat couple.
(2) arranging main heater: adopt rope form heater, centered by weld seam, weld seam both sides constant power, equal in width symmetry are wound around heating rope, and both sides winding width is 170mm.
(3) arranging assisted heating device: adopt rope form heater, the upper winding of supervisor in close proximity to main heater main tube end heats rope, and owing to locus is limit, part heating rope is wrapped on arm, is wound around power 50kW.
(4) by the given main heater heat treatment cycle curve of post weld heat treatment processing parameter setting.
(5) assisted heating device heat treatment cycle curve is set: main heater end temperature thermocouple, assisted heating device temperature-control heat couple are accessed a Temperature-controlled appliance, the real time temperature that temperature thermocouple records can be changed into the real-time control temperature of assisted heating device temperature-control heat couple by this equipment, sets the temperature that the real-time control temperature of assisted heating device records in real time as main heater end temperature thermocouple.
(6) eliminate or reduce pipeline air flowing: closing the valve on the piping of threeway place, to alleviate the air flowing within threeway.
(7) heat affected zone insulation: heat-preserving range is heating element heater coverage and outside 500mm, threeway 500mm length all and on arm.
(8) main heater, assisted heating device start simultaneously at heating.
During engineering construction, with temperature measuring device, the temperature survey of heating region being shown, take above-mentioned post weld heat treatment method, commissure temperature is heating region maximum temperature, and circumference temperature is only small, meets joint post weld heat treatment technology requirement.
Embodiment 2
Certain power station jet chimney has a T-shaped threeway, material is P22, supervisor's specification is OD426 �� 95.0 (mm), arm specification is OD406 �� 90.0 (mm), supervisor's banjo fixing butt jointing to arm centre distance is 470mm, the pipeline material being connected with supervisor is P22, and specification is OD419 �� 90.0 (mm). Arm all welds with external pipe with supervisor. Supervisor's welding point is carried out post weld heat treatment by welding process requirement, and the width of heating of post weld heat treatment is 2 times of weld seam every side supervisor's wall thickness, and given post weld heat treatment technological parameter is: thermostat temperature 730 DEG C, constant temperature time 4.0h, 60 DEG C/h of warming and cooling rate.
Adopt the inventive method that this supervisor's banjo fixing butt jointing is carried out local post weld heat treatment, be embodied as step as follows:
(1) thermocouple is arranged: at 1 thermocouple of location arrangements being connected with supervisor bottom of weld seam, as main heater temperature-control heat couple; 1 thermocouple of each layout on the supervisor at main heater two ends (from weld seam 190mm place) and pipeline respectively, and thermocouple is respectively positioned on the position relative with threeway shoulder summit, wherein 1 thermocouple on pipeline is main heater end temperature thermocouple, and 1 thermocouple on supervisor is assisted heating device temperature-control heat couple.
(2) arranging main heater: adopt rope form heater, centered by weld seam, weld seam both sides constant power, equal in width symmetry are wound around heating rope, and both sides winding width is 190mm.
(3) arranging assisted heating device: adopt rope form heater, the upper winding of supervisor against main heater main tube end heats rope, and winding width is 70mm.
(4) by the given main heater heat treatment cycle curve of post weld heat treatment processing parameter setting.
(5) assisted heating device heat treatment cycle curve is set: main heater end temperature thermocouple, assisted heating device temperature-control heat couple are accessed a Temperature-controlled appliance, sets the temperature that the real-time control temperature of assisted heating device records in real time as main heater end temperature thermocouple.
(6) eliminate or reduce pipeline air flowing: closing the valve on the piping line of threeway place, to alleviate the air flowing within threeway.
(7) heat affected zone insulation: heat-preserving range be heating element heater coverage and outside 500mm, threeway all and the pipeline 1000mm scope being connected with arm.
(8) main heater, assisted heating device start simultaneously at heating.
During engineering construction, with temperature measuring device, the temperature survey of heating region being shown, take above-mentioned post weld heat treatment method, commissure temperature is heating region maximum temperature, and circumference temperature is only small, meets joint post weld heat treatment technology requirement.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this. All equivalences made according to spirit of the invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (6)
1. threeway supervisor's banjo fixing butt jointing local post weld heat treatment method, described threeway supervisor's banjo fixing butt jointing includes the threeway being made up of supervisor and arm, pipeline, connect the weld seam of described supervisor and pipeline, it is characterized in that: described post weld heat treatment method adopts main heater and assisted heating device described threeway to be responsible for banjo fixing butt jointing simultaneously and is heated, wherein:
Being provided that of described main heater
Heating element heater constant power, equal in width are arranged symmetrically in the two ends of described weld seam;
Temperature-control heat couple is arranged on a side position relative with side, described arm place of described weld seam;
Heat treatment cycle curve is by given post weld heat treatment processing parameter setting;
Being provided that of described assisted heating device
Heating element heater is arranged against main heater main tube end;
Temperature-control heat couple is arranged in the upper position relative with described threeway shoulder summit of main heater end supervisor;
Real time temperature �� 10 DEG C of position relative with threeway shoulder summit on its end pipeline when real-time control temperature is main heating devices heat;
Main heater and assisted heating device start simultaneously at heating;
On the pipeline of main heater end, the position relative with threeway shoulder summit arranges 1 thermocouple, as main heater end temperature thermocouple, the temperature-control heat couple of this end temperature thermocouple with described assisted heating device is accessed input temp can be converted into the Temperature-controlled appliance controlling temperature, set the real-time control temperature that real time temperature �� 10 DEG C are assisted heating device that described end temperature thermocouple records; The temperature-control heat couple of described assisted heating device arrange position, described main heater end temperature thermocouple position, described threeway shoulder summit are set on the same line, and this straight line is parallel with the axis of described supervisor.
2. threeway according to claim 1 supervisor banjo fixing butt jointing local post weld heat treatment method, it is characterised in that: set real time temperature that described end temperature thermocouple the records real-time control temperature as assisted heating device.
3. threeway according to claim 1 supervisor banjo fixing butt jointing local post weld heat treatment method, it is characterised in that: the arm of described threeway welds with external pipe.
4. threeway according to claim 1 supervisor banjo fixing butt jointing local post weld heat treatment method, it is characterised in that: described threeway and the material of pipeline are identical or different.
5. threeway according to claim 1 supervisor banjo fixing butt jointing local post weld heat treatment method, it is characterised in that: described supervisor and the specification of described pipeline are identical or different.
6. threeway according to claim 1 supervisor banjo fixing butt jointing local post weld heat treatment method, it is characterised in that: described method comprises the steps:
(1), thermocouple is installed: 1 thermocouple is installed on a side position relative with side, described arm place of weld seam, as the temperature-control heat couple of main heater; Arrange 2 thermocouples at the two ends of the main heater relative with threeway shoulder summit, wherein the thermocouple by pipe end is main heater end temperature thermocouple, and the thermocouple by main tube end is assisted heating device temperature-control heat couple;
(2), installing main heater: select flexible heater rope or heating plate as heating element heater, centered by weld seam, weld seam two ends constant power, equal in width are arranged symmetrically with main heater, arrange that width is determined according to post weld heat treatment technological requirement;
(3), installing assisted heating device: select flexible heater rope or heating plate as heating element heater, arrange heating element heater against main heater main tube end, heating element heater is all arranged in be responsible for above or when its limited space, is partially disposed on arm;
(4), main heater heat treatment cycle curve is set;
(5), assisted heating device control temperature is set: main heater end temperature thermocouple and assisted heating device temperature-control heat couple cut-in temperature are controlled equipment, sets the real-time control temperature that real time temperature �� 10 DEG C are assisted heating device that main heater end temperature thermocouple records;
(6), covering and heat insulating is cotton: within the scope of main heater and assisted heating device and outside at least 300mm thereof, covering and heat insulating is cotton;
(7) valve on pipeline, blocking pipe port, are closed;
(8), main heater and assisted heating device start simultaneously at heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410403195.4A CN104131148B (en) | 2014-08-15 | 2014-08-15 | A kind of threeway supervisor's banjo fixing butt jointing local post weld heat treatment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410403195.4A CN104131148B (en) | 2014-08-15 | 2014-08-15 | A kind of threeway supervisor's banjo fixing butt jointing local post weld heat treatment method |
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| CN104131148A CN104131148A (en) | 2014-11-05 |
| CN104131148B true CN104131148B (en) | 2016-06-08 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104561509A (en) * | 2014-12-26 | 2015-04-29 | 中国核工业二三建设有限公司 | Method for assisting heat treatment of steel pipe welding seams |
| CN105200224B (en) * | 2015-11-10 | 2018-01-05 | 山东核电设备制造有限公司 | A kind of local post weld heat treatment method of quenched material very large vessels |
| 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 |
| CN107932916A (en) * | 2017-11-24 | 2018-04-20 | 苏州水博士建材科技有限公司 | A kind of production method of threeway |
| CN107975645A (en) * | 2017-11-24 | 2018-05-01 | 苏州水博士建材科技有限公司 | A kind of production method of four-way |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58189330A (en) * | 1982-04-30 | 1983-11-05 | Hitachi Ltd | Heat treatment of piping system and coil for heating |
| JPS60169522A (en) * | 1984-02-14 | 1985-09-03 | Seiichi Okuhara | Control device for continuous working device |
| JPS60255930A (en) * | 1984-05-31 | 1985-12-17 | Dai Ichi High Frequency Co Ltd | Heating method and apparatus for improving residual stress in welded part of branched pipe |
| CN102409153B (en) * | 2011-11-14 | 2013-04-10 | 苏州热工研究院有限公司 | Postweld heat treatment method of welded joint of pipelines with different specifications |
| CN202865295U (en) * | 2012-09-12 | 2013-04-10 | 中国化学工程第七建设有限公司 | Pipeline heat-treatment device |
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