CN203200313U - Inner plugging device for welding heat treatment of pipeline - Google Patents
Inner plugging device for welding heat treatment of pipeline Download PDFInfo
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- CN203200313U CN203200313U CN 201320172243 CN201320172243U CN203200313U CN 203200313 U CN203200313 U CN 203200313U CN 201320172243 CN201320172243 CN 201320172243 CN 201320172243 U CN201320172243 U CN 201320172243U CN 203200313 U CN203200313 U CN 203200313U
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Abstract
The utility model provides an inner plugging device for welding heat treatment of a pipeline. The inner plugging device comprises two cylindrical inner sealing blocks, wherein a first inner sealing block and a second inner sealing block are connected through a steel wire rope; one end of the steel wire rope stretches out of the first inner sealing block; the first inner sealing block is provided with an air inflating hole; the distance between the two inner sealing blocks is 40-60cm. In a welding process of the pipeline, the inner sealing blocks are arranged at the two ends of a welding line so that the heat loss generated when air in the pipeline flows in a heat treatment process of the pipeline is reduced; heat radiation of heat along axial and radial directions of the pipeline is relieved and a temperature gradient is reduced, so that metal in a uniform-temperature region can reach needed lowest temperature in a thickness direction. A temperature difference of inner and outer walls of the welding line is less than 20 degrees and the temperature of the inner wall is basically controlled to 760 DEG C, so as to reach the lower limit of a high-temperature annealing temperature required by SA335P92 steel.
Description
Technical field
The utility model belongs to the installation work technical field, is specifically related to a kind of for the heat treated interior plugging device of pipeline welding.
Background technology
Vapor temperature parameter owing to overcritical coal fired power generation unit is greatly improved at present, all adopted New Heat-Resistant Steel SA335P92 steel at high temperature parts such as hot arc and main steams, and the use of this heavy caliber thick wall New Heat-Resistant Steel has brought technical barrier for the construction welding.The weak link of whole welding joint is at weld seam, and the Toughness Ratio mother metal of general weld seam is much lower.And welding heat is processed the general flexible ceramic resistance heating device that adopts, the flexible ceramic electrical resistance heating is radiation heating, its principle of heating is the outside surface that passes to workpiece from the heat energy that well heater sends with the form of radiation, rely on metal heat-conducting, from outside surface to conducted inside, certainly exist thermograde.So in the postweld heat treatment process, thicken along with the wall thickness of processing pipeline and cause inside and outside wall temperature difference to increase thereupon.In addition, because narrow 760 ± 10 ℃ of P92 steel postweld heat treatment temperature range, the local weld seam thermal treatment temp of the inwall of welding joint probably is in thermal treatment temp and below the lower limit, thereby makes the performance of whole welding joint be in inhomogeneous state; Add the measuring error of temp measuring system various degrees of present equipment for Heating Processing and the fixed position form that thermopair adopts colligation, these all affect the accuracy of heat treatment process, and directly affect the toughness of welding joint.
Simultaneously, because of construction condition abominable more than the laboratory, heat dissipating state is complicated, welding heat work for the treatment of under the welding heat treatment process evaluation of making under the desirable operating mode and field working conditions has difference, under the guidance of procedure qualification, make the improvement that is fit to the thermal treatment process under the field working conditions particularly important for this reason.The related data demonstration, the postweld heat treatment temperature is at 760 ± 10 ℃, and in this temperature range, the postweld heat treatment of P92 steel welded joint could obtain good over-all properties, just reaches the lower limit of the high tempering temperature of SA335P92 steel requirement.For this reason, require large-sized heavy-wall tube under the resistive heating effect, the temperature difference of inside and outside wall is strict controlled in＜20 ℃ scope in, just can guarantee the quality of welding joint.
The utility model content
In order to solve the problems of the technologies described above, it is a kind of for the heat treated interior plugging device of pipeline welding that the utility model provides, can effectively reduce inside and outside wall temperature difference problem, guarantee the homogeneity of whole property of welded joint in the P92 steel postweld heat treatment process, guarantee the impelling strength of the root of weld.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of for the heat treated interior plugging device of pipeline welding, comprise the columniform first interior envelope piece and the second interior envelope piece, be connected by wireline between the described first interior envelope piece and the second interior envelope piece, an end of wireline passes the first interior envelope piece; The described first interior envelope piece is provided with aeration aperture, and the distance in described two between the envelope piece is 40-60cm.
The described first interior envelope piece and the second interior envelope piece all are to be connected and fixed by screw rod by two block plates, are filled with insulating cotton between two block plates; The diameter of described insulating cotton is than the large 10-15cm of diameter of steel plate.
In order to reduce the inside and outside temperature head of pipeline, be provided with resistance wire between the described first interior envelope piece and the second interior envelope piece, an end of resistance wire passes the first interior envelope piece.Will pass the resistance wire energising heating of the first interior envelope piece, make the temperature increase of pipe interior, reduce the temperature head of itself and pipeline external.
For easy to operate, be equipped with hanger on the inboard steel plate of the described first interior envelope piece and the second interior envelope piece, described wireline and hanger are affixed.
The diameter of envelope piece is determined according to the pipe diameter of required welding in two of the present utility model, the diameter of general steel plate than the little 120mm of internal diameter of the pipeline about; And the diameter of insulating cotton than the large 20mm of internal diameter of the pipeline about.
The first interior envelope piece and the second interior envelope piece all are to fill cylindric that insulating cotton consists of by two block plates are middle, and the diameter of insulating cotton is larger than the diameter of steel plate, makes its edge soft, with inner-walls of duct energy close contact, have prevented the circulation of air.Connect by wireline between the envelope piece in two, consist of plugging device in the cover.When pipeline is welded; first interior plugging device is placed in the both sides pipeline of weld bond; then be filled with argon gas protection by aeration aperture to its inside; according to normal technique it is welded heat treatment operation at last; thermal treatment is pulled out plugging device in this from the pipeline tapping end by wireline after finishing.If the bore of pipeline or wall thickness are excessive, and cause the inside and outside wall of pipeline to have temperature head, at this moment can will be located at the resistance wire energising heating between the envelope piece in two, make the inside and outside wall temperature difference of weld seam of pipeline＜20 ℃.
So the utlity model has following beneficial effect:
1, pipeline is in welding, because respectively being provided with in one, the two ends of weld seam seal piece, thereby the thermal losses when reducing pipeline inner air tube in heat treatment process and flowing, retarding heat is along pipeline axial and heat radiation radially, reduce thermograde, make the metal in the samming zone reach required minimum temperature at thickness direction.
2, this apparatus structure is simple, and is easy to make, and cost is low; And be to be repeatedly used, improved utilization ratio.
3, the pipeline that connects of butt welding carries out the thermometric experiment with thermopair, the data of reading from temperature-control heat couple and equivalent heat galvanic couple, adopt this interior plugging device and carry out Resistant heating in inside simultaneously, so that the same cross section of the weld seam of pipeline peripheral outer wall temperature is basic identical, temperature is evenly distributed; Radial direction, inner wall temperature are inhomogeneous state.In the constant temperature later stage, the inside and outside wall temperature difference of weld seam＜20 ℃, the inner wall temperature basic controlling reaches the lower limit of the high tempering temperature of SA335P92 steel requirement at 760 ℃.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Fig. 1 is the front view of the first interior envelope piece in the utility model.
Fig. 2 is side-view of the present utility model.
Fig. 3 uses the utility model that pipeline is carried out welding heat to process rear its welding temperature graphic representation.
Fig. 4 uses the utility model that pipeline is carried out the metallograph that welding heat is processed rear pipeline, and a is the metallograph of weld seam, and b is the metallograph before pipeline thermal is processed, and c is the metallograph after pipeline thermal is processed.
Among the figure: 1-the first interior envelope piece, 2-insulating cotton, 3-steel plate, 4-aeration aperture, 5-resistance wire, 6-wireline, 7-hanger, 8-screw rod, 9-the second interior envelope piece.
Embodiment
Embodiment one:
As shown in Figure 1 and Figure 2, a kind of for the heat treated interior plugging device of pipeline welding, comprise the columniform first interior envelope piece 1 and the second interior envelope piece 9, be connected by wireline 6 between the described first interior envelope piece 1 and the second interior envelope piece 9, an end of wireline 6 passes the first interior envelope piece 1; The described first interior envelope piece 1 is provided with aeration aperture 4, and the distance in described two between the envelope piece is 50cm.The described first interior envelope piece 1 and the second interior envelope piece 9 all are to be connected and fixed by screw rod 8 by two block plates 3, are filled with insulating cotton 2 between two block plates 3; The diameter of described insulating cotton 2 is than the large 14cm of diameter of steel plate 3.Be provided with resistance wire 5 between the described first interior envelope piece 1 and the second interior envelope piece 9, an end of resistance wire 5 passes the first interior envelope piece 1.Be equipped with hanger 7 on the inboard steel plate of the described first interior envelope piece 1 and the second interior envelope piece 9, described wireline 6 is affixed with hanger 7.
When pipeline is welded; just interior plugging device is placed in the both sides pipeline of weld bond first; then be filled with argon gas protection by aeration aperture to its inside; according to normal technique it is welded heat treatment operation at last; thermal treatment is pulled out plugging device in this from the pipeline tapping end by wireline after finishing.If the bore of pipeline or wall thickness are excessive, and cause the inside and outside wall of pipeline to have temperature head, at this moment can will be located at the resistance wire energising heating between the envelope piece in two, make the inside and outside wall temperature difference of weld seam of pipeline＜20 ℃.
Embodiment two:
1, the pipeline that connects of butt welding carries out the thermometric experiment with thermopair, is about to thermopair and arranges along axis of a weld, respectively arranges a point for measuring temperature at 12:00,3:00,6:00 temperature control district outer wall.Record the result as shown in Figure 3: 100～150 ℃ of preheating temperature GTAW; Interlayer temperature: 200～300 ℃; Need be chilled to 80～100 ℃ after the welding, constant temperature 2h; Heat-up rate≤150 ℃/h; Cooling rate≤70 ℃/h; Natural slow cooling below 300 ℃; Thermal treatment temp: 760 ± 10 ℃; Constant temperature time: 4 h.Namely adopt the heat treated postweld heat treatment temperature of pipeline welding of the utility model processing in 760 ± 10 ℃ of scopes, guaranteed the quality of pipeline welded joint.
2, the standard of hardness value test is according to GB/T231-2009 " metal static hardness test " method the pipeline after welding to be carried out the hardness value test.The pipe welding seam hardness value is as shown in the table, and its weld hardness value meets the requirements in 230～250HB.
| Sequence number | The position | Brinell hardness number | Brinell hardness number |
| 1 | Weld seam | HB252、HB238、HB244 | HB244 |
| 2 | Mother metal | HB203、HB210、HB207 | HB207 |
| 3 | The heat affected zone | HB208、HB200、HB205 | HB204 |
3, as shown in Figure 4, a is the metallograph of weld seam, and b is the metallograph before pipeline thermal is processed, and c is the metallograph after pipeline thermal is processed.
Before butt welded seam, pipeline thermal are processed with the pipeline thermal processing after microanalysis draw, seam organization is tempered martensite, the lath feature is obvious, the martensite lath complete display, it is qualified to organize; In addition, be martensitic stucture before pipeline thermal is processed with after the pipeline thermal processing, it is qualified to organize.
Above embodiment is not limited only to protection domain of the present utility model, all make amendment based on basic thought of the present utility model or change all belong to protection domain of the present utility model.
Claims (4)
1. one kind is used for the heat treated interior plugging device of pipeline welding, it is characterized in that: comprise the columniform first interior envelope piece and the second interior envelope piece, be connected by wireline between the described first interior envelope piece and the second interior envelope piece, an end of wireline passes the first interior envelope piece; The described first interior envelope piece is provided with aeration aperture, and the distance in described two between the envelope piece is 40-60cm.
2. according to claim 1 a kind of for the heat treated interior plugging device of pipeline welding, it is characterized in that: the described first interior envelope piece and the second interior envelope piece all are to be connected and fixed by screw rod by two block plates, are filled with insulating cotton between two block plates; The diameter of described insulating cotton is than the large 10-15cm of diameter of steel plate.
3. according to claim 1 a kind of for the heat treated interior plugging device of pipeline welding, it is characterized in that: be provided with resistance wire between the described first interior envelope piece and the second interior envelope piece, an end of resistance wire passes the first interior envelope piece.
4. according to claim 2 a kind of for the heat treated interior plugging device of pipeline welding, it is characterized in that: be equipped with hanger on the inboard steel plate of the described first interior envelope piece and the second interior envelope piece, described wireline and hanger are affixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320172243 CN203200313U (en) | 2013-04-08 | 2013-04-08 | Inner plugging device for welding heat treatment of pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320172243 CN203200313U (en) | 2013-04-08 | 2013-04-08 | Inner plugging device for welding heat treatment of pipeline |
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| Publication Number | Publication Date |
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| CN203200313U true CN203200313U (en) | 2013-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320172243 Expired - Fee Related CN203200313U (en) | 2013-04-08 | 2013-04-08 | Inner plugging device for welding heat treatment of pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112251588A (en) * | 2020-09-30 | 2021-01-22 | 中国石油化工股份有限公司 | Tool clamp for heat treatment temperature uniformity of prefabricated pipe fitting and use method |
-
2013
- 2013-04-08 CN CN 201320172243 patent/CN203200313U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112251588A (en) * | 2020-09-30 | 2021-01-22 | 中国石油化工股份有限公司 | Tool clamp for heat treatment temperature uniformity of prefabricated pipe fitting and use method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CEEC ANHUI ELECTRIC POWER CONSTRUCTION SECOND ENGI Free format text: FORMER NAME: CEEC ANHUI ELECTRIC POWER CONSTRUCTION SECOND ENGINEERING COMPANY |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 230601, No. 12600, prosperous road, Hefei economic and Technological Development Zone, Anhui Patentee after: Chinese energy construction group Anhui electric power builds the second Engineering Co., Ltd Address before: 230601, No. 12600, prosperous road, Hefei economic and Technological Development Zone, Anhui Patentee before: CEEC CHINA ENERGY ENGINEERING GROUP CO., LTD., ANHUI NO.2 ELECTRIC POWER ENGINEERING & CONSTRUCTION CORPORATION |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20210408 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |