CN101264561A - Pipeline welding inside heating method - Google Patents
Pipeline welding inside heating method Download PDFInfo
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- CN101264561A CN101264561A CNA2008100549225A CN200810054922A CN101264561A CN 101264561 A CN101264561 A CN 101264561A CN A2008100549225 A CNA2008100549225 A CN A2008100549225A CN 200810054922 A CN200810054922 A CN 200810054922A CN 101264561 A CN101264561 A CN 101264561A
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Abstract
The invention relates to an inner heating method for pipeline welding. When the grooves of two pipelines are butted according to the requirement, then a heating device, which is composed of a heating element arranged on a middle holding frame and a terminal holding frame connected with both ends of the middle holding frame, is arranged on the grooves of the two pipelines; a closed heating region of the pipeline groove is formed by an insulation layer fixedly connected with both ends of the terminal holding frame. The heating element is heated when the power cord is switched on; the closed heating region is filled with protecting gas by a protecting gas communicating port arranged on the insulation layer. The heating method has the advantages that the difficulty in process of P92 welding is solved when inner and outer temperature difference is too large, as structure property decreasing caused by the too large temperature difference, catastrophic accident does not occur in future operation process of power station because the problem is solved; the technical difficulty that inner and outer temperature difference is too large because of large thick wall (larger than 70mm) of the P92 steel tube, so welding quality is ensured and long term stable operation of the pipeline is satisfied.
Description
Technical field
The present invention relates to a kind of pipeline welding inside heating method.
Background technology
Along with the electric power unit develops to big capacity high parameter, the power station begins to use with green wood P92 etc., and the thickness of pipeline is increasing, and this brings difficulty to heat treatment, mainly is the inside and outside non-uniform temperature, and internal temperature is low, the external temperature height.On the one hand cause internal-external temperature difference stress, make that post weld heat treatment can not fine removal welding residual stress, and produced new residual stress on the contrary.Because internal temperature is low, the temperature that heat treatment needs does not reach in addition, and to making structure property poor, especially impact flexibility is low.Data shows that heat treatment temperature is lower than 730 ℃ and promptly can not guarantees notched bar impact strength, and heat treatment temperature is 760 ℃, and promptly internal-external temperature difference can not be difficult to reach at present equipment level greater than 30 ℃.Unlikely too high for guaranteeing pipeline internal-external temperature difference stress, impact flexibility meets the demands, and has adopted a series of method on the engineering, as widens heated perimeter and insulation scope, adopts power frequency (intermediate frequency) mode of heating etc.When thickness reaches certain value (more than the 70mm), adopt to widen heated perimeter and be incubated can not guarantee requirement, adopt power frequency (intermediate frequency) mode of heating to be subjected to the restriction of curie point again, temperature can't meet the demands.
Summary of the invention
Technical problem to be solved by this invention provides a kind of welding quality that guarantees to satisfy the pipeline welding inside heating method of pipeline operation steady in a long-term needs.
The present invention adopts following technical scheme:
The present invention two pipelines by welding requirements to good groove after; to place the groove place of two tool pipelines by the heater that the end portion supports that is arranged on the heating element heater on the intermediate support beam and be connected with the intermediate support beam two ends is configured to; the heat-insulation layer fixedly connected at the end support shelves two ends constitutes the airtight heating interval of tube groove; heating element heater is connected the power supply heating by power line, and the protective gas connected entrance that is arranged on the heat-insulation layer fills protective gas to airtight heating interval.
The present invention utilizes the welding of protective gas connected entrance argon filling, and temperature is controlled at the lower limit of preheat temperature in the welding process, post weld heat treatment, and the control heater temperature is the upper limit that heat treatment temperature requires.
Heating element heater of the present invention adopts the heater strip on the intermediate support beam that the far infrared rope formula heater that is wrapped on the intermediate support beam or employing be enclosed within insulation.
Layer centre or a layer arranged outside at heat-insulation layer of the present invention has by the fixedly connected resiliency supported sheet of trip bolt.
Good effect of the present invention is as follows: the present invention is the mode that adopts inner heating, mainly is by inner heating element heater, and the infrared ray of generation directly is radiated on the tube wall, and penetrates tube wall, secondly is by the convection current of inner air tube the pipeline inner tubal wall to be heated.Use the invention solves internal-external temperature difference difficult point in P92 welding process when excessive, promptly solved the structure property that excessive temperature differentials brings and descended, and solved this problem, in the power station running in the future, catastrophic accident can not take place.The invention solves the excessive technical barrier of internal-external temperature difference of at present big heavy wall (greater than 70mm) P92 steel pipe, can effectively guarantee welding quality, satisfy the needs of pipeline operation steady in a long-term.
Description of drawings
Accompanying drawing 1 is a heater structure schematic diagram in the inventive method
Accompanying drawing 2 is for being provided with resiliency supported chip architecture schematic diagram in the middle of the heater insulation layer by layer in the inventive method
Accompanying drawing 3 is a heater user mode schematic diagram in the inventive method
Accompanying drawing 4 is that heater adopts the heater strip structural representation in the inventive method
In the accompanying drawings: 1 heating element heater, 2 intermediate support beams, 3 end support shelves, 4 heat-insulation layers, 5 protective gas connected entrances, 6 power lines, 7 trip bolts, 8 screw gaskets, 9 metallic bonds, 10 temperature survey joints, 11 water backs, 12 resiliency supported sheets, 13 heater strips.
The specific embodiment
During the pipeline outer wall heating, thermal source conducts heat to pipeline outer wall by heat conduction and heat radiation, and heat passes to inwall by heat exchange pattern then.The pipeline wall thickness direction is also dispelled the heat outside the thermal treatment zone simultaneously, and inwall is also by the heat radiation of convection type inner air medium.Inner air then passes to other position by convection type with heat.When heat production and heat radiation reached balance, the inside and outside wall temperature difference no longer changed.It is fast more to dispel the heat, and heat production is more little, and temperature difference is big more.Firing equipment is subjected to the influence of key elements such as power, can not infinitely increase, and reducing heat radiation this moment and disperseing hot source point is exactly good way.
Use the inventive method pipe interior adopts the convection current outside the interior gas flow minimizing of constraint heated perimeter and the thermal treatment zone; Inside is established heating element heater and is promptly divided source of heat release by heat radiation and Convective Heating inner-walls of duct.
The invention process is for example shown in the accompanying drawing 1,2,3,4, heater heating element heater 1 of the present invention can adopt far infrared rope formula heater to be wrapped on the intermediate support beam 2 (or pipe), as shown in Figure 4, heater also can adopt heater strip 13 to be enclosed within on the intermediate support beam 2 of insulation in the inventive method, does not use to add intermediate support beam 2 when heater strip 13 intensity are enough.The end of heating element heater 1 is stretched out end plate and is joined by heating element heater power line 6 and power supply.The intermediate support beam 2 of heating element heater 1 is connected with end support shelves 3, and end support shelves 3 is as the criterion at 2/3 place of following radius can smoothly enter water back 11 and to guarantee to add the thermal center (-tre) according to the internal diameter adjustment of water back 11.
The heater of the present invention end bracing frame 3 outer circular heat-insulation layers 4 that install band resiliency supported sheet 12 additional; by trip bolt 7 circular heat-insulation layer 4 and resiliency supported sheet 12 are fixed together; the effect of circular heat-insulation layer 4 is to reduce scattering and disappearing of heat on the one hand, stops scattering and disappearing of internal protection argon gas on the other hand.Circular heat-insulation layer 4 adds resiliency supported sheet 12, so that the present invention takes out (pipeline that particularly has reducing) when withdrawing from smoothly after usefulness.
The effect that heter temperature of the present invention is measured joint 10 is the temperature of measuring in the thermal treatment zone; The effect of protective gas connected entrance 5 is to filling protective gas in the weld zone.The effect that heater is drawn metallic bond 9 is after heat treatment is finished (flaw detection finish after), so that heater of the present invention is taken out.
As shown in Figure 3, earlier heater of the present invention is placed the position of counterpart before counterpart, protective gas connected entrance 5, heating element heater power line 6, temperature survey joint 10, metallic bond 9 place the direction of taking out in the future.The opposite side pipeline is inserted in from heater opposite side of the present invention.Also fixing by welding requirements to good groove.The energising preheating, the temperature of control heater of the present invention satisfies preheat requirements, and keeps this temperature in welding process.
Utilize the welding of protective gas connected entrance 5 argon fillings, temperature is controlled at the lower limit of preheat temperature in the welding process, and purpose is to guarantee martensite transfor mation fast.
Post weld heat treatment, controlling heter temperature of the present invention is the upper limit that heat treatment temperature requires.Defect detecting test, cooling back defect detecting test, this moment, heater of the present invention was stayed in the pipeline, prepared against when reprocessing and used.After passed examination, be the slowly outwards extraction simultaneously of argon-filled tube, power line 6, thermometric lead with metallic bond 9, protective gas connected entrance 5.
Check the firing equipment integrality, the metal device of staying in the pipeline can not be arranged.Safeguard, take care of heater of the present invention, in order to using next time.
After if heater of the present invention is drawn out accidentally, can heater be pushed up back again according to duct length with resisting bar stubbornly, various lines connections are together pushed up back when noting pushing up back, can not come off.
Claims (4)
1; a kind of pipeline welding inside heating method; it is characterized in that two pipelines by welding requirements to good groove after; to place the groove place of two tool pipelines by the heater that the end support shelves (3) that is arranged on the heating element heater (1) on the intermediate support beam (2) and is connected with intermediate support beam (2) two ends constitutes; the heat-insulation layer (4) fixedly connected at end support shelves (3) two ends constitutes the airtight heating interval of tube groove; heating element heater (1) is connected the power supply heating by power line (6), and the protective gas connected entrance (5) that is arranged on the heat-insulation layer (4) fills protective gas to airtight heating interval.
2, a kind of pipeline welding inside heating method according to claim 1; it is characterized in that utilizing the welding of protective gas connected entrance (5) argon filling; temperature is controlled at the lower limit of preheat temperature in the welding process, post weld heat treatment, and the control heater temperature is the upper limit that heat treatment temperature requires.
3, a kind of pipeline welding inside heating method according to claim 1 and 2 is characterized in that described heating element heater (1) adopts the heater strip on the intermediate support beam (2) that the far infrared rope formula heater be wrapped on the intermediate support beam (2) or employing be enclosed within insulation.
4, a kind of pipeline welding inside heating method according to claim 1 and 2 is characterized in that a described layer centre or a layer arranged outside at heat-insulation layer (4) has by the fixedly connected resiliency supported sheet (12) of trip bolt (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100549225A CN101264561A (en) | 2008-05-05 | 2008-05-05 | Pipeline welding inside heating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100549225A CN101264561A (en) | 2008-05-05 | 2008-05-05 | Pipeline welding inside heating method |
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| CN101264561A true CN101264561A (en) | 2008-09-17 |
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| CNA2008100549225A Pending CN101264561A (en) | 2008-05-05 | 2008-05-05 | Pipeline welding inside heating method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724740B (en) * | 2008-10-16 | 2011-04-13 | 天津诚信达金属检测技术有限公司 | Method for heat treatment of P92 steel |
| CN102601552A (en) * | 2011-12-20 | 2012-07-25 | 宁夏电力建设工程公司 | Heater for butt-welding steel tubes |
| CN102699589A (en) * | 2012-07-05 | 2012-10-03 | 南通中远船务工程有限公司 | Preheating welding device for circular pile leg of wind power installation vessel and preheating welding method thereof |
| CN102825402A (en) * | 2012-09-07 | 2012-12-19 | 中原特钢股份有限公司 | Preheating device for progressive welding of large-pipe-diameter casting pipe die |
| CN105431255A (en) * | 2013-08-01 | 2016-03-23 | 伊利诺斯工具制品有限公司 | System, device, and methods for heating an inside wall of a pipe or a vessel with a heating means and a movable mechanical device |
| CN105485685A (en) * | 2015-04-28 | 2016-04-13 | 无锡华光锅炉股份有限公司 | Reverse flame heating device |
| CN105834603A (en) * | 2015-01-16 | 2016-08-10 | 中国石油天然气集团公司 | Automatic device for preventing necking during welding |
| CN105834615A (en) * | 2015-01-16 | 2016-08-10 | 中国石油天然气集团公司 | Manual-type device preventing necking during welding |
| CN107557541A (en) * | 2017-10-16 | 2018-01-09 | 山东电力建设第工程公司 | The big footpath posted sides pipeline argon filling heating and thermal insulation frock of 9% ~ 12%Cr martensite heat-resistant steels and method |
| CN107984124A (en) * | 2017-11-28 | 2018-05-04 | 共享铸钢有限公司 | Big wall thickness pipe fitting groove welding preheating device |
| CN108866314A (en) * | 2018-07-04 | 2018-11-23 | 苏州热工研究院有限公司 | A method of guaranteeing that major diameter thick-walled pipe weld seam is heat-treated uniformity |
| CN110408765A (en) * | 2019-09-06 | 2019-11-05 | 哈尔滨锅炉厂有限责任公司 | A kind of thick-walled vessel case heat treating method |
| CN113400028A (en) * | 2021-07-07 | 2021-09-17 | 江西剑安消防科技有限责任公司 | Header pipe cutting and welding integrated device |
| CN114473200A (en) * | 2022-03-08 | 2022-05-13 | 中国航空制造技术研究院 | Laser welding inner wall protection system and welding method for small-diameter pipeline |
-
2008
- 2008-05-05 CN CNA2008100549225A patent/CN101264561A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724740B (en) * | 2008-10-16 | 2011-04-13 | 天津诚信达金属检测技术有限公司 | Method for heat treatment of P92 steel |
| CN102601552A (en) * | 2011-12-20 | 2012-07-25 | 宁夏电力建设工程公司 | Heater for butt-welding steel tubes |
| CN102601552B (en) * | 2011-12-20 | 2015-10-07 | 宁夏电力建设工程公司 | The heater of steel pipe butt welding |
| CN102699589A (en) * | 2012-07-05 | 2012-10-03 | 南通中远船务工程有限公司 | Preheating welding device for circular pile leg of wind power installation vessel and preheating welding method thereof |
| CN102825402A (en) * | 2012-09-07 | 2012-12-19 | 中原特钢股份有限公司 | Preheating device for progressive welding of large-pipe-diameter casting pipe die |
| CN105431255A (en) * | 2013-08-01 | 2016-03-23 | 伊利诺斯工具制品有限公司 | System, device, and methods for heating an inside wall of a pipe or a vessel with a heating means and a movable mechanical device |
| CN105834615A (en) * | 2015-01-16 | 2016-08-10 | 中国石油天然气集团公司 | Manual-type device preventing necking during welding |
| CN105834603A (en) * | 2015-01-16 | 2016-08-10 | 中国石油天然气集团公司 | Automatic device for preventing necking during welding |
| CN105834603B (en) * | 2015-01-16 | 2017-10-17 | 中国石油天然气集团公司 | A kind of self-action prevents from welding the device of necking down |
| CN105834615B (en) * | 2015-01-16 | 2018-10-16 | 中国石油天然气集团公司 | A kind of hand prevents the device of welding necking down |
| CN105485685A (en) * | 2015-04-28 | 2016-04-13 | 无锡华光锅炉股份有限公司 | Reverse flame heating device |
| CN105485685B (en) * | 2015-04-28 | 2018-02-23 | 无锡华光锅炉股份有限公司 | A kind of reverse flame heating device |
| CN107557541A (en) * | 2017-10-16 | 2018-01-09 | 山东电力建设第工程公司 | The big footpath posted sides pipeline argon filling heating and thermal insulation frock of 9% ~ 12%Cr martensite heat-resistant steels and method |
| CN107984124A (en) * | 2017-11-28 | 2018-05-04 | 共享铸钢有限公司 | Big wall thickness pipe fitting groove welding preheating device |
| CN108866314A (en) * | 2018-07-04 | 2018-11-23 | 苏州热工研究院有限公司 | A method of guaranteeing that major diameter thick-walled pipe weld seam is heat-treated uniformity |
| CN110408765A (en) * | 2019-09-06 | 2019-11-05 | 哈尔滨锅炉厂有限责任公司 | A kind of thick-walled vessel case heat treating method |
| CN113400028A (en) * | 2021-07-07 | 2021-09-17 | 江西剑安消防科技有限责任公司 | Header pipe cutting and welding integrated device |
| CN114473200A (en) * | 2022-03-08 | 2022-05-13 | 中国航空制造技术研究院 | Laser welding inner wall protection system and welding method for small-diameter pipeline |
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| PB01 | Publication | ||
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Effective date of registration: 20081219 Address after: Postal code of Hebei Electric Power Research Institute, No. 238 South Sports street, Hebei, Shijiazhuang Province, China: 050021 Applicant after: Hebei Electric Power Research Institute Co-applicant after: Hebei Electric Power Construction & Adjustment Research Institute Address before: Postal code of Hebei Electric Power Research Institute, No. 238 South Sports street, Hebei, Shijiazhuang Province, China: 050021 Applicant before: Hebei Electric Power Research Institute |
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Open date: 20080917 |