CN109465559A - The long piece welding of heat-resistant high alloy steel tube panel and post weld heat treatment technique - Google Patents
The long piece welding of heat-resistant high alloy steel tube panel and post weld heat treatment technique Download PDFInfo
- Publication number
- CN109465559A CN109465559A CN201811284505.XA CN201811284505A CN109465559A CN 109465559 A CN109465559 A CN 109465559A CN 201811284505 A CN201811284505 A CN 201811284505A CN 109465559 A CN109465559 A CN 109465559A
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- China
- Prior art keywords
- tube panel
- heat treatment
- section
- welding
- piece
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
Abstract
In order to solve the problems, such as in the long seam welding of tube panel and heat treatment process it is ineffective, construction efficiency is low, tube panel is easily-deformable, the present invention provides a kind of long piece welding of heat-resistant high alloy steel tube panel and post weld heat treatment technique, mainly use section gap skip welding and heat treatment, step type heat-treating methods, tube panel slit is welded and is heat-treated, it avoids the long piece of tube panel while heating and cooling down, reduce the deformation rate of tube panel piece, meanwhile also greatly improving construction efficiency.
Description
Technical field
The present invention relates to steel-pipe welding technical field, in particular to a kind of long piece welding of heat-resistant high alloy steel tube panel and weldering
Heat treatment process afterwards.
Background technique
The power station quantity of circulating fluidized bed boiler is more and more in recent years, and the heat-resistant high alloy steel of SA-387GR91 is largely used
In heating surface tube panel fin, need to be heat-treated after long piece (size 11900mm) the SA-387GR91 welding between two tube panels.
The post weld heat treatment method of on-site conventional at present: electric heating and flame heating must use electric heating to reach high-alloy steel
To the temperature and homogeneous heating of standard requirements, and the difficult point of piece post weld heat treatment long for high-alloy steel is heater
Fixed, most common fixing means is to cover tracklayer heater, heat-preservation cotton up and down, above commissure be pressed in using steel plate
In heat-preservation cotton, below commissure heater and heat-preservation cotton supported using special-purpose supporting frame, to carry out post weld heat treatment.
The post weld heat treatment of the long piece of high-alloy steel is carried out using existing method, generally welds one section of one section of heat treatment, or
Person has welded after a piece weld seam all day while being heat-treated, and usually has that support frame is not fixed firmly, thermal effectiveness is bad, applies
The easily-deformable problem of work low efficiency, tube panel.
Summary of the invention
To solve the above-mentioned problems, the present invention provides at a kind of long piece welding of heat-resistant high alloy steel tube panel and postwelding heat
Science and engineering skill, the technical solution adopted is as follows:
The long piece welding of high-alloy steel tube panel and post weld heat treatment technique, which is characterized in that including section gap skip welding and segmentation
Interval heat treatment, specifically, the following steps are included:
S1., the long piece of tube panel to be welded is divided into the several segments of equal length, to segmentation number consecutively, the long piece of tube panel is divided into surprise
Several sections of tube panel pieces and even number section tube panel piece, first successively weld odd number section tube panel piece；
S2. heater, heat-preservation cotton are fixed by odd number section tube panel piece upper and lower surface after welding using fixed device；
S3. post weld heat treatment is successively carried out to welding the odd number section weld seam finished in S1 step, in the tube panel weld seam to odd number section
While carrying out post weld heat treatment, the tube panel piece of the even number section adjacent to odd number section is welded；
S4. finally, the tube panel weld seam of dual numbers section successively carries out post weld heat treatment；
Wherein, the post weld heat treatment of odd number section or even number section is all made of the mode of step type heating, i.e. odd number section or even number
After a certain period of time, the piece of next adjacent odd number section or even number section starts to carry out the heating of weld seam again for piece heating in section.
Preferably, the long piece section length of the tube panel is 1m.
Preferably, the interval time of the step type heating is 1.5h.
Preferably, in the step S3, the post weld heat treatment technological parameter that every section of weld seam of post weld heat treatment executes is as follows: rising
150 DEG C/h of cooling rate, constant temperature time 1h, 730 DEG C~750 DEG C of thermostat temperature, can not when weld seam temperature is down to 300 DEG C or less
Temperature control is carried out, weld seam Slow cooling is made.
The beneficial effects of the present invention are:
1, using section gap welding and post welding heat treatment, it can be achieved that welding and the alternately operating being heat-treated, do not interfere with each other, improve
Construction efficiency shortens the construction period, reduces construction cost；
2, it using step type heat-treating methods, avoids long piece while heating and cooling down, reduce the change of long piece
Form quotient；
3, by fixed device, so that heater is fitted closely with tube panel, it is ensured that play inhibition weldering while thermal effectiveness
Connect the effect of deformation.
Detailed description of the invention
Fig. 1 is that section gap skip welding and section gap are heat-treated schematic diagram
Fig. 2 is fixture structure schematic diagram
Fig. 3 is fixed device main view
Wherein, the first fixed frame of 1-, the second fixed frame of 2-, 3- bundling belt, 4- strainer, 5- heater, 6- heat-preservation cotton, 7- pipe
Screen, the long piece of 8- tube panel, 9- header.
Specific embodiment
The present invention is described in further detail for 1-3 and specific embodiment with reference to the accompanying drawing.
As shown in Fig. 2, the tube panel 7 of two longer dimensions is spliced, stitching portion has the tube panel of elongatedness directional spreding is long to spell
Seam 8, as shown in Figure 1, it is 7 sections of equal length that the long piece 8 of tube panel, which is divided, and be numbered 1~No. 7, the long piece 8 of tube panel into
Row welding when, first since No. 1 tube panel edge joint position, by the way of section gap skip welding to 1,3,5, No. 7 tube panel piece according to
It is secondary to be welded.
Lower section setting heating after every section of welding, in the top and lower surface of 1,3,5, No. 7 tube panel weld seam upper surface
Device 5, the heat-preservation cotton 6 positioned at 5 outer surface of heater, and be fixedly connected on the outer surface of heat-preservation cotton 6 for fixed heater and
The fixation device of heat-preservation cotton.
As shown in figure 3, fixed device mainly includes the first fixed frame 1, the second fixed frame 2, bundling belt 3 and strainer
4, first fixed frame 1 is located at 7 top of heat-preservation cotton of tube panel weld seam upper surface, and the second fixed frame 2 is located at tube panel weld seam following table
The lower section of the heat-preservation cotton 7 in face, the first fixed frame 1 and the second fixed frame 2 are respectively fixedly connected with by bundling belt 3 in the upper of tube panel 7
Side and lower section, bundling belt 3 are successively fixed around the left end of tube panel 7, the upper top of the first fixed frame 1, the right end of tube panel 7, second
First fixed frame 1 and the second fixed frame 2 are fixed behind the lower top of frame 2, and are also connected with drawing at the both ends of bundling belt 3
Tight device 4 is used for elastic bundling belt 3, is moved easily the first fixed frame 1 and the second fixed frame 2.
Heating device and fixed device after setting completed, carry out tube panel weld seam using the method for step type heating
PWHT operations, specifically, carrying out the heating of weld seam, No. 1 tube panel weld seam heating to it by No. 1 tube panel weld seam
Start the heating of No. 3 tube panel weld seams of progress after 1.5h, starts to rise No. 5 tube panel weld seams after No. 3 tube panel weld seams heating 1.5h
Temperature starts to heat up to No. 7 tube panel weld seams after No. 5 tube panel weld seams heating 1.5h, and so on, until close to 9 side of header
Tube panel weld seam section when carrying out the heat treatment of 1,3,5, No. 7 tube panel weld seam, while welding 2,4, No. 6 tube panel pieces, than
Such as, when carrying out post weld heat treatment to No. 1 tube panel weld seam, while No. 2 tube panel pieces are welded, to No. 3 tube panel pieces into
When row post weld heat treatment, while No. 4 tube panel pieces are welded ..., until the welding of even number section tube panel piece finishes.
2, after 4, No. 6 tube panel piece welding, fixed device is moved at the upper and lower surface of 2,4, No. 6 tube panel weld seams,
Post weld heat treatment is carried out to 2,4, No. 6 tube panel weld seams using the method for step type heating, specifically, No. 2 tube panel weld seam liters
Start to heat up to No. 4 tube panel weld seams after warm 1.5h, starts to carry out No. 6 tube panel weld seams after No. 4 tube panel weld seam heating 1.5h
Heating, so that the welding of the long piece 8 of whole tube panel and the heat treatment of tube panel weld seam are completed, the side heated up using step type
Method, every section of weld seam will not be in maximum temperature within the same period, and welding and heat treatment is independent of each other, using point
The alternately operating, it can be achieved that welding and heat treatment is welded and is heat-treated at section interval, is not interfere with each other, is improved construction efficiency.
Wherein, when the method to be heated up using step type carries out post weld heat treatment to tube panel weld seam, every section of weld seam is straight
Capable heat treatment parameter is as follows, and 150 DEG C/h of warming and cooling rate, constant temperature time 1h, 730 DEG C -750 DEG C of thermostat temperature cool to 300
DEG C or less can not temperature control, keep weld seam Slow cooling in heater.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvement can also be made, these improvement also should be regarded as of the invention
Protection scope.
Claims (4)
1. the long piece welding of high-alloy steel tube panel and post weld heat treatment technique, which is characterized in that including section gap skip welding and divide
The heat treatment of section interval, specifically, the following steps are included:
S1., the long piece of tube panel to be welded is divided into the several segments of equal length, to segmentation number consecutively, the long piece of tube panel is divided into surprise
Several sections of tube panel pieces and even number section tube panel piece, first successively weld odd number section tube panel piece；
S2. heater, heat-preservation cotton are fixed by odd number section tube panel piece upper and lower surface after welding using fixed device；
S3. post weld heat treatment is successively carried out to welding the odd number section weld seam finished in S1 step, in the tube panel weld seam to odd number section
While carrying out post weld heat treatment, the tube panel piece of the even number section adjacent to odd number section is welded；
S4. finally, the tube panel weld seam of dual numbers section successively carries out post weld heat treatment；
Wherein, the post weld heat treatment of odd number section or even number section is all made of the mode of step type heating, i.e. odd number section or even number
After a certain period of time, the piece of next adjacent odd number section or even number section starts to carry out the heating of weld seam again for piece heating in section.
2. the long piece welding of high-alloy steel tube panel according to claim 1 and post weld heat treatment technique, which is characterized in that institute
Stating the long piece section length of tube panel is 1m.
3. the long piece welding of high-alloy steel tube panel according to claim 2 and post weld heat treatment technique, which is characterized in that institute
The interval time for stating step type heating is 1.5h.
4. the long piece welding of high-alloy steel tube panel according to claim 1 to 3 and post weld heat treatment technique,
It is characterized in that, in the step S3, the post weld heat treatment technological parameter that every section of weld seam of post weld heat treatment executes is as follows: heating and cooling speed
150 DEG C/h, constant temperature time 1h, 730 DEG C~750 DEG C of thermostat temperature are spent, it can be without control when weld seam temperature is down to 300 DEG C or less
Temperature makes weld seam Slow cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811284505.XA CN109465559B (en) | 2018-10-31 | 2018-10-31 | Long-abutted seam welding and postweld heat treatment process for high-alloy heat-resistant steel tube panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811284505.XA CN109465559B (en) | 2018-10-31 | 2018-10-31 | Long-abutted seam welding and postweld heat treatment process for high-alloy heat-resistant steel tube panel |
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| Publication Number | Publication Date |
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| CN109465559A true CN109465559A (en) | 2019-03-15 |
| CN109465559B CN109465559B (en) | 2021-05-04 |
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| CN201811284505.XA Active CN109465559B (en) | 2018-10-31 | 2018-10-31 | Long-abutted seam welding and postweld heat treatment process for high-alloy heat-resistant steel tube panel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110788506A (en) * | 2019-12-30 | 2020-02-14 | 福能(贵州)发电有限公司 | Method for preventing deformation of water-cooled wall assembly |
| CN111529974A (en) * | 2020-06-01 | 2020-08-14 | 南京大学 | Ultrasonic directional constant-temperature heating method based on annular array |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110788506A (en) * | 2019-12-30 | 2020-02-14 | 福能(贵州)发电有限公司 | Method for preventing deformation of water-cooled wall assembly |
| CN111529974A (en) * | 2020-06-01 | 2020-08-14 | 南京大学 | Ultrasonic directional constant-temperature heating method based on annular array |
| CN111529974B (en) * | 2020-06-01 | 2021-09-24 | 南京大学 | Ultrasonic directional constant-temperature heating method based on annular array |
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| Publication number | Publication date |
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| CN109465559B (en) | 2021-05-04 |
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