CN109465559B - Long-abutted seam welding and postweld heat treatment process for high-alloy heat-resistant steel tube panel - Google Patents
Long-abutted seam welding and postweld heat treatment process for high-alloy heat-resistant steel tube panel Download PDFInfo
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- CN109465559B CN109465559B CN201811284505.XA CN201811284505A CN109465559B CN 109465559 B CN109465559 B CN 109465559B CN 201811284505 A CN201811284505 A CN 201811284505A CN 109465559 B CN109465559 B CN 109465559B
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- 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
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- 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
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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
- C21D11/00—Process control or regulation for heat treatments
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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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Abstract
The invention provides a welding and postweld heat treatment process for long joints of a high-alloy heat-resistant steel tube panel, which mainly adopts a method of segmented interval skip welding and heat treatment and segmented step-type heat treatment to weld and thermally treat the long joints of the tube panel, so that the simultaneous heating and cooling of the long joints of the tube panel are avoided, the deformation rate of the long joints of the tube panel is reduced, and meanwhile, the construction efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of steel pipe welding, in particular to a long abutted seam welding and postweld heat treatment process for a high-alloy heat-resistant steel pipe panel.
Background
In recent years, the number of power stations of circulating fluidized bed boilers is increasing, a large amount of high-alloy heat-resistant steel SA-387GR91 is used in heating surface tube panel fins, and long abutted seams (the size of 11900 mm) between two tube panels are subjected to heat treatment after SA-387GR91 is welded. The traditional on-site postweld heat treatment method at present comprises the following steps: the method comprises the following steps of electric heating and flame heating, wherein the high alloy steel needs to be heated by electricity to reach the temperature required by the standard and is heated uniformly, the difficulty of the high alloy steel long abutted seam post-welding heat treatment lies in the fixation of a heater, the most common fixation method at present is to cover a crawler-type heater and heat insulation cotton up and down, the upper welding seam is pressed on the heat insulation cotton by a steel plate, and the lower welding seam is supported by a special support frame to support the heater and the heat insulation cotton, so that the post-welding heat treatment is carried out.
The existing method is used for carrying out postweld heat treatment on the long abutted seam of the high alloy steel, one section of the long abutted seam is generally welded, or the whole day of the welded seam is simultaneously subjected to heat treatment after one abutted seam is welded, so that the problems of poor fixing of a support frame, poor heat treatment effect, low construction efficiency and easy deformation of a tube panel generally exist.
Disclosure of Invention
In order to solve the problems, the invention provides a long abutted seam welding and postweld heat treatment process for a high-alloy heat-resistant steel tube panel, which adopts the following technical scheme:
the long seam welding and postweld heat treatment process of the high alloy steel tube panel is characterized by comprising segmented interval skip welding and segmented interval heat treatment, and specifically comprises the following steps:
s1, dividing a long splicing seam of a pipe panel to be welded into a plurality of sections with equal length, sequentially numbering the sections, dividing the long splicing seam of the pipe panel into odd-numbered section splicing seams of the pipe panel and even-numbered section splicing seams of the pipe panel, and firstly sequentially welding the odd-numbered section splicing seams of the pipe panel;
s2, fixing a heater and heat preservation cotton on the upper surface and the lower surface of the welded odd-number-section pipe screen splicing seam by adopting a fixing device;
s3, sequentially carrying out postweld heat treatment on the welded odd-numbered sections in the step S1, and welding the splicing seams of the tube panels of the odd-numbered adjacent even-numbered sections while carrying out postweld heat treatment on the tube panel welding seams of the odd-numbered sections;
s4, finally, sequentially carrying out postweld heat treatment on the tube panel welding seams of the even sections;
the method is characterized in that the postweld heat treatment of the odd-numbered section or the even-numbered section adopts a sectional step type heating mode, namely after the temperature of the seam in the odd-numbered section or the even-numbered section is raised for a certain time, the temperature of the seam is raised again by the next adjacent seam in the odd-numbered section or the even-numbered section.
Preferably, the length of the long abutted seam segment of the tube panel is 1 m.
Preferably, the interval time of the stepwise temperature rise is 1.5 h.
Preferably, in step S3, the post-weld heat treatment process parameters performed by the post-weld heat treatment on each section of the weld are as follows: the temperature rising and falling speed is 150 ℃/h, the constant temperature time is 1h, the constant temperature is 730-750 ℃, and when the temperature of the welding seam is reduced to be below 300 ℃, the temperature can not be controlled, so that the welding seam is slowly cooled.
The invention has the beneficial effects that:
1. by adopting the segmented interval welding and the post-welding heat treatment, the alternate operation of the welding and the heat treatment can be realized without mutual interference, the construction efficiency is improved, the construction period is shortened, and the construction cost is reduced;
2. by adopting a sectional step type heat treatment method, the long splicing seam is prevented from being heated and cooled simultaneously, and the deformation rate of the long splicing seam is reduced;
3. through fixing device for heater and tube panel closely laminate, play the effect of suppression welding deformation when having ensured the heat treatment effect.
Drawings
FIG. 1 is a schematic view of a segmented gap stitch welding and a segmented gap heat treatment
FIG. 2 is a schematic view of a fixing device
FIG. 3 is a front view of the fixing device
The heat insulation device comprises a first fixing frame, a second fixing frame, a binding belt, a tensioner, a heater, heat insulation cotton, a tube panel, a long splicing seam and a header, wherein the first fixing frame is 1, the second fixing frame is 2, the binding belt is 3, the tensioner is 4, the heater is 5, the heat insulation cotton is 6, the tube panel is 7, the long splicing seam of the tube panel is 8, and the.
Detailed Description
The invention will be described in further detail below with reference to the accompanying figures 1-3 and specific embodiments.
As shown in figure 2, two tube panels 7 with longer sizes are spliced, tube panel long splicing seams 8 distributed in the direction of the extension degree are arranged at the splicing positions, as shown in figure 1, the tube panel long splicing seams 8 are divided into 7 sections with equal lengths and are numbered from 1 to 7, and when the tube panel long splicing seams 8 are welded, the tube panel long splicing seams 1, 3, 5 and 7 are welded in sequence by adopting a segmented interval skip welding mode from the tube panel splicing seams 1.
After each section of welding is finished, a heater 5 and heat insulation cotton 6 positioned on the outer surface of the heater 5 are arranged above the upper surface and below the lower surface of the welding seam of the No. 1, 3, 5 and 7 tube panel, and a fixing device for fixing the heater and the heat insulation cotton is fixedly connected on the outer surface of the heat insulation cotton 6.
As shown in fig. 3, the fixing device mainly includes a first fixing frame 1, a second fixing frame 2, a binding belt 3 and a tensioner 4, the first fixing frame 1 is located above the heat insulation cotton 7 on the upper surface of the tube panel weld joint, the second fixing frame 2 is located below the heat insulation cotton 7 on the lower surface of the tube panel weld joint, the first fixing frame 1 and the second fixing frame 2 are respectively and fixedly connected above and below the tube panel 7 through the binding belt 3, the binding belt 3 sequentially bypasses the left end of the tube panel 7, the upper top end of the first fixing frame 1, the right end of the tube panel 7 and the lower top end of the second fixing frame 2 to fix the first fixing frame 1 and the second fixing frame 2, and the tensioners 4 are further connected to the two ends of the binding belt 3 for loosening and tightening the binding belt 3, so as to facilitate movement of the first fixing frame 1 and the second fixing frame 2.
After the heating device and the fixing device are arranged, a segmented step heating method is adopted to perform postweld heat treatment operation on the tube panel weld joint, specifically, the tube panel weld joint is heated from the tube panel weld joint No. 1, the tube panel weld joint No. 1 is heated for 1.5h, the tube panel weld joint No. 3 is heated, the tube panel weld joint No. 5 is heated after 1.5h, the tube panel weld joint No. 5 is heated for 1.5h, the tube panel weld joint No. 7 is heated, and the like in sequence until the tube panel weld joint section close to the side of the header tank 9, when the heat treatment of the tube panel weld joints No. 1, 3, 5 and 7 is performed, the tube panel splice joints No. 4, 6 are welded simultaneously, for example, when the postweld heat treatment is performed on the tube panel weld joint No. 1, the tube panel splice joint No. 2 is welded simultaneously, and when the postweld heat treatment is performed on the tube panel splice joint No. 3, the tube panel splice joint No. 4 is welded … simultaneously, and (5) finishing the welding of the splicing seams of the even-numbered tube panels.
2. 4, after the number 6 pipe panel abutted seam welding is finished, the fixing device is moved to the upper surface and the lower surface of the number 2, 4, 6 pipe panel welding seam, the number 2, 4, 6 pipe panel welding seam is subjected to postweld heat treatment by adopting a segmented step type heating method, specifically, the number 4 pipe panel welding seam is heated after the number 2 pipe panel welding seam is heated for 1.5h, and the number 6 pipe panel welding seam is heated after the number 4 pipe panel welding seam is heated for 1.5h, so that the welding of the whole pipe panel long abutted seam 8 and the heat treatment of the pipe panel welding seam are completed, the segmented step type heating method is adopted, each section of welding seam cannot be at the highest temperature in the same time period, the welding and the heat treatment are not influenced with each other, the welding and the heat treatment can be alternately operated, the mutual interference is avoided, and the construction efficiency is improved.
When the postweld heat treatment is carried out on the tube panel welding seam by using the sectional step type temperature rise method, the straight heat treatment parameters of each section of welding seam are as follows, the temperature rise and fall speed is 150 ℃/h, the constant temperature time is 1h, the constant temperature is 730 ℃ -750 ℃, the temperature can not be controlled when the temperature is reduced to below 300 ℃, and the welding seam is kept to be slowly cooled in a heater.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.
Claims (4)
1. The long seam welding and postweld heat treatment process of the high alloy steel tube panel is characterized by comprising segmented interval skip welding and segmented interval heat treatment, and specifically comprises the following steps:
s1, dividing a long splicing seam of a pipe panel to be welded into a plurality of sections with equal length, sequentially numbering the sections, dividing the long splicing seam of the pipe panel into odd-numbered section splicing seams of the pipe panel and even-numbered section splicing seams of the pipe panel, and firstly sequentially welding the odd-numbered section splicing seams of the pipe panel;
s2, fixing a heater and heat preservation cotton on the upper surface and the lower surface of the welded odd-number-section pipe screen splicing seam by adopting a fixing device;
s3, sequentially carrying out postweld heat treatment on the welded odd-numbered sections in the step S1, and welding the splicing seams of the tube panels of the odd-numbered adjacent even-numbered sections while carrying out postweld heat treatment on the tube panel welding seams of the odd-numbered sections;
s4, finally, sequentially carrying out postweld heat treatment on the tube panel welding seams of the even sections;
the method is characterized in that the postweld heat treatment of the odd-numbered section or the even-numbered section adopts a sectional step type heating mode, namely after the temperature of the seam in the odd-numbered section or the even-numbered section is raised for a certain time, the temperature of the seam is raised again by the next adjacent seam in the odd-numbered section or the even-numbered section.
2. The high-alloy steel tube panel long-abutted seam welding and post-welding heat treatment process according to claim 1, wherein the length of each segment of the tube panel long-abutted seam is 1 m.
3. The long abutted seam welding and postweld heat treatment process for the high alloy steel tube panel according to claim 2, wherein the interval time of the stepwise temperature rise is 1.5 hours.
4. The long-abutted seam welding and post-weld heat treatment process for the high-alloy steel tube panel according to any one of claims 1 to 3, wherein in the step S3, the post-weld heat treatment process parameters of each section of welding seam after post-weld heat treatment are as follows: the temperature rising and falling speed is 150 ℃/h, the constant temperature time is 1h, the constant temperature is 730-750 ℃, and when the temperature of the welding seam is reduced to be below 300 ℃, the temperature can not be controlled, so that the welding seam is slowly cooled.
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| 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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| 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 |
| 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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