CN107738039B - Steel membrane type tube panel sealing welding method - Google Patents
Steel membrane type tube panel sealing welding method Download PDFInfo
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- CN107738039B CN107738039B CN201710959485.0A CN201710959485A CN107738039B CN 107738039 B CN107738039 B CN 107738039B CN 201710959485 A CN201710959485 A CN 201710959485A CN 107738039 B CN107738039 B CN 107738039B
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- welding
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- pipe
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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
Abstract
The invention discloses a steel film type tube panel sealing welding method, which solves the problem that secondary high-temperature tempering heat treatment influences the quality of a welding seam when a tube panel is welded in the prior art, and has the effects of high welding quality, reduction of tube panel deformation and improvement of the service life of the tube panel; the technical scheme is as follows: the method comprises the following steps: firstly welding at least two pipe fittings into a long pipe, and then arranging the at least two long pipes and at least one flat steel at intervals to form a pipe panel structure; sequentially welding a plurality of welding seams on the first flat steel along the direction parallel to the axis of the long pipe by taking the first flat steel as a welding starting point, wherein each welding seam is symmetrically welded on two sides; sequentially welding other flat steels in the same welding direction as the first flat steel; welding the welding seams of the same side of the flat steel and the pipe fitting in sequence in a two-side symmetrical mode from the first flat steel; and welding the welding seam between the other side of the flat steel and the pipe fitting in a two-side symmetrical mode from the first flat steel.
Description
Technical Field
The invention relates to the field of welding of membrane type tube panels of boilers, in particular to a steel membrane type tube panel seal welding method.
Background
At present, with the development of the coal gasification industry and high-parameter boilers, the application of the membrane type wall tube panel is more and more extensive. The structures of a high-temperature reheater, a high-temperature superheater, a medium-temperature superheater and the like in the circulating fluidized bed boiler all adopt a mode tube panel structure.
Generally, the welding method of the mode tube panel structure is as follows: respectively welding the pipe fittings, performing high-temperature tempering at 750-770 ℃ for one hour after welding, welding the pipe fittings and the fins by welding rods in the sequence of welding the fins and the pipe fittings at intervals, then coating the whole welding line area by using a full-circle heater, and performing high-temperature tempering at 750-770 ℃ for one hour.
The heating mode is equivalent to performing two times of high-temperature tempering heat treatment on the welding seam area, so that the welding seam hardness is lower than a standard reduction value, the hardness value of the welding seam area is too low to meet the requirement, the welding seam quality is influenced, and the service life of a power plant in the future in the operation process is further influenced.
In summary, in the prior art, an effective solution for solving the problem of twice high-temperature tempering heat treatment in the welding process of the film type tube panel is still lacking.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a steel film type tube panel sealing welding method, which solves the problem that secondary high-temperature tempering heat treatment influences the quality of a welding seam during tube panel welding, and has the effects of high welding quality, reduction of tube panel deformation and improvement of the service life of the tube panel.
The invention adopts the following scheme:
a steel membrane type tube panel sealing welding method comprises the following steps:
step A, welding at least two pipe fittings into a long pipe, and arranging the long pipe and at least one flat steel at intervals to form a pipe screen structure;
step B, taking a first flat steel (the flat steel between two long pipes on the left side is the first flat steel) as a welding starting point, and sequentially welding a plurality of welding seams on the first flat steel along the direction parallel to the axis of the long pipes, wherein each welding seam is subjected to two-side symmetric welding; sequentially welding other flat steels in the same welding direction as the first flat steel;
step C, welding the welding seams of the same side of the flat steel and the pipe fitting in a two-side symmetrical mode from the first flat steel;
and D, sequentially welding the welding seam between the other side of the flat steel and the pipe fitting from the first flat steel in a two-side symmetrical mode.
Further, after the step A is finished, preheating the welding line of the area to be welded.
Further, an electric heating method or a flame heater method is adopted for preheating, and the preheating temperature is 200-250 ℃.
And D, further, after the welding in the step D is finished, carrying out post-heat treatment on the whole welding seam at the temperature of 300-350 ℃ for 2-4 h.
Further, an electric heater is used for post-heat treatment.
Further, a nickel-based welding rod is adopted for welding.
Further, in the step B, the welding direction of each flat steel is from bottom to top.
Furthermore, the pipe fitting is made of SA-213T91 material.
Furthermore, the flat steel is made of SA-387Gr91 materials.
Compared with the prior art, the invention has the beneficial effects that:
(1) when the welding is carried out, for the same area to be welded, two welding seams at opposite positions are welded firstly, then two welding seams at opposite positions of other areas to be welded are welded, and then the welding seams at the same side of the area to be welded are welded in sequence, and then the welding seams at the other side of the area to be welded are welded in sequence; the welding process optimizes the welding process of the welding seam, and avoids the local overheating phenomenon caused by continuous welding of the same area to be welded;
(2) according to the invention, the preheating treatment is carried out before welding, and the post-heating treatment is carried out after welding, so that the secondary high-temperature tempering heat treatment of a welding seam area is avoided, the welding seam quality is improved, the structural deformation of the tube panel is reduced, and the service life of the heated surface tube fitting is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural view of the present invention;
wherein a to j are pipe fittings, and 1 to 16 are welding seams.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, the prior art has the defect that two times of high-temperature tempering heat treatment are needed in the film type tube panel welding process, and in order to solve the technical problems, the application provides a steel film type tube panel sealing welding method.
In a typical embodiment of the present application, as shown in fig. 1, a steel membrane tube panel seal welding method is provided, wherein a tube is made of SA-213T91 material and has a size specification of phi 63.5mm × 11.5 mm; the sealed fins are made of SA-387Gr91 flat steel with the size of 12mm multiplied by 6 mm.
As shown in fig. 1, taking 10 pipes as an example, namely, the pipes a to j, flat steels are arranged between adjacent pipes, and a first flat steel, a second flat steel, a third flat steel and a fourth flat steel are arranged from left to right in sequence; a region to be welded is formed on each flat steel around the welding location with the two pipe elements.
The area to be welded on the first flat steel is a rectangular welding area consisting of a welding line 1, a welding line 2, a welding line 3 and a welding line 4, wherein the welding line 1 and the welding line 2 are opposite and vertical to the axis of the pipe fitting, and the welding line 3 and the welding line 4 are opposite and parallel to the axis of the pipe fitting.
The to-be-welded area on the second flat steel is a rectangular welding area formed by a welding line 5, a welding line 6, a welding line 7 and a welding line 8, the welding line 5 and the welding line 6 are opposite and vertical to the axis of the pipe fitting, and the welding line 7 and the welding line 8 are opposite and parallel to the axis of the pipe fitting.
The to-be-welded area on the third flat steel is a rectangular welding area formed by a welding line 9, a welding line 10, a welding line 11 and a welding line 12, the welding line 9 and the welding line 10 are opposite and vertical to the axis of the pipe fitting, and the welding line 11 and the welding line 12 are opposite and parallel to the axis of the pipe fitting.
The to-be-welded area on the fourth flat steel is a rectangular welding area formed by a welding line 13, a welding line 14, a welding line 15 and a welding line 16, the welding line 13 and the welding line 14 are opposite and vertical to the axis of the pipe fitting, and the welding line 15 and the welding line 1 are opposite and parallel to the axis of the pipe fitting.
The welding seams are all welding seams on the front surface of the tube panel structure, and the welding seams exist at the positions, corresponding to the welding seams, on the back surface of the tube panel structure.
The welding method in the prior art comprises the following steps:
firstly, respectively welding a pipe fitting a, a pipe fitting b, a pipe fitting c, a pipe fitting d and a pipe fitting e with a pipe fitting f, a pipe fitting g, a pipe fitting h, a pipe fitting i and a pipe fitting j, and performing high-temperature tempering at 750-770 ℃ for one hour after the welding is finished;
then welding seams 1 and 2 on the fins (flat steel) to a welding seam 16 in sequence by manually operating an E9015-B9 welding rod;
then, the whole welding seam area pipe fitting is coated by a whole circle of heater, and high temperature tempering is carried out at the temperature of 750-770 ℃ for one hour.
The welding mode is equivalent to two times of high-temperature tempering heat treatment on the tube panel structure, the hardness of a welding seam is probably lower than the lower limit value of a standard value of 180 HB-290 HB, so that the hardness value of a welding seam area is too low to meet the requirement, and the service life of a power plant in the operation process is further influenced.
The welding method comprises the following steps:
step one, preparation before welding: cleaning the surfaces of the pipe fittings and the flat steel, and removing stains such as oil, rust, water and the like;
step two, respectively welding the pipe fitting a and the pipe fitting f, the pipe fitting b and the pipe fitting g, the pipe fitting c and the pipe fitting h, the pipe fitting d and the pipe fitting i, and the pipe fitting e and the pipe fitting j together to form a first long pipe, a second long pipe, a third long pipe, a fourth long pipe and a fifth long pipe, wherein flat steel is arranged between the adjacent long pipes;
thirdly, preheating the welding seam area to be welded between the long pipe and the flat steel to 200-250 ℃ by using an electric heating method or a flame heater method; the fin (flat steel) welding is carried out by adopting a nickel-based welding rod ERNiCr-3, and the welding sequence is as follows:
firstly, welding seams which are vertical to the axial direction of the pipe fitting are welded in sequence from left to right and from bottom to top, namely, the welding seams 1, 2, 5, 6, 9, 10, 13 and 14 are welded in sequence, and each welding seam adopts two-side symmetric welding (for one welding seam, the front side is welded first, and then the back side is welded);
welding seams parallel to the axis direction of the pipe fitting are welded, and the same sides of the flat steels are welded from the left side of the first flat steel at the leftmost side; welding seams 3, 7, 11 and 15 are welded in sequence, and each welding seam is symmetrically welded on two sides; and then welding right side welding seams of the flat steels, namely sequentially welding the welding seams 4, the welding seams 8, the welding seams 12 and the welding seams 16, wherein each welding seam adopts two-side symmetrical welding.
And step four, after the welding is finished, performing post-heat treatment on the whole welding seam by using an electric heater at the temperature of 300-350 ℃ for 2-4 h.
When the welding method is used for welding, for the same area to be welded, two welding seams at opposite positions are welded firstly, then two welding seams at opposite positions of other areas to be welded are welded, then the welding seams at the same side of the area to be welded are welded in sequence, and then the welding seams at the other side of the area to be welded are welded in sequence; the welding process optimizes the welding process of the welding line, avoids the local overheating phenomenon caused by continuous welding of the same area to be welded, avoids secondary high-temperature tempering heat treatment of the welding line area, improves the quality of the welding line, reduces the structural deformation of the tube panel, and prolongs the service life of the heated surface tube fitting.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. A steel membrane type tube panel sealing welding method is characterized by comprising the following steps:
step A, welding at least two pipe fittings into a long pipe, and arranging the long pipe and at least one flat steel at intervals to form a pipe screen structure;
after the step A is finished, preheating the welding line of the area to be welded;
step B, taking the first flat steel as a welding starting point, and sequentially welding a plurality of welding seams on the first flat steel along the direction vertical to the axis of the long pipe, wherein each welding seam is subjected to two-side symmetric welding; sequentially welding other flat steels in the same welding direction as the first flat steel, wherein the welding direction of each flat steel is from bottom to top;
step C, welding the welding seams of the same side of the flat steel and the pipe fitting in a two-side symmetrical mode from the first flat steel;
d, sequentially welding the welding seam between the other side of the flat steel and the pipe fitting in a two-side symmetrical mode from the first flat steel;
and D, after the welding in the step D is finished, carrying out post-heat treatment on the whole welding seam at the temperature of 300-350 ℃ for 2-4 h.
2. The method for seal welding of steel film type tube panel according to claim 1, wherein preheating is performed by an electric heating method or a flame heater method, and the preheating temperature is 200 ℃ to 250 ℃.
3. The method of claim 1, wherein the post heat treatment is performed by an electric heater.
4. The method as claimed in claim 1, wherein the welding is performed using a nickel-based welding rod.
5. The method of claim 1, wherein the tube is made of SA-213T 91.
6. The method for sealing and welding the steel film type tube panel according to claim 1, wherein the flat steel is made of SA-387Gr 91.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710959485.0A CN107738039B (en) | 2017-10-16 | 2017-10-16 | Steel membrane type tube panel sealing welding method |
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| CN201710959485.0A CN107738039B (en) | 2017-10-16 | 2017-10-16 | Steel membrane type tube panel sealing welding method |
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| CN107738039A CN107738039A (en) | 2018-02-27 |
| CN107738039B true CN107738039B (en) | 2020-08-14 |
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| WO2020082322A1 (en) * | 2018-10-26 | 2020-04-30 | 中国电建集团山东电力建设第一工程有限公司 | Construction method for in-wall pipe in tower boiler |
| CN113000985B (en) * | 2019-12-20 | 2024-02-09 | 无锡华光环保能源集团股份有限公司 | Automatic surfacing process for surface of membrane type wall tube panel |
| CN112986005A (en) * | 2021-03-01 | 2021-06-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Creep test method for power station heated surface pipe welding joint |
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| CN104801834A (en) * | 2014-08-14 | 2015-07-29 | 江苏绿叶锅炉有限公司 | T91 water wall tube row welding technology |
| CN106141511A (en) * | 2015-04-23 | 2016-11-23 | 江苏绿叶锅炉有限公司 | A kind of ultra supercritical large-sized boiler steel pipe membrane wall manufacturing process |
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| JPS55139169A (en) * | 1979-04-17 | 1980-10-30 | Sekisui Chem Co Ltd | Method and apparatus for making solar heat collecting board |
| CN2725833Y (en) * | 2004-09-04 | 2005-09-14 | 威远县东方型钢厂 | Welding flat steel |
| CN203900803U (en) * | 2014-06-16 | 2014-10-29 | 山东电力建设第一工程公司 | Telescopic device for boiler heating surface calandria opening aligning |
| CN106378517B (en) * | 2016-11-30 | 2019-01-29 | 东方电气集团东方锅炉股份有限公司 | A kind of band steel fillet weld seam technique of membrane panel dissimilar steel joint position |
| CN106964881A (en) * | 2017-03-07 | 2017-07-21 | 上海锅炉厂有限公司 | Supercritical CFB Boiler high temperature pendant superheater stainless steel buried arc welding method |
| CN106862787B (en) * | 2017-03-30 | 2018-12-14 | 烟台国冶冶金水冷设备有限公司 | The process of the motor-driven welder nickel-base alloy tube panel of membrane wall |
| CN106944760B (en) * | 2017-04-14 | 2019-05-03 | 郑州三众耐磨技术有限公司 | Water-cooling wall abrasionproof scale type welding method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104801834A (en) * | 2014-08-14 | 2015-07-29 | 江苏绿叶锅炉有限公司 | T91 water wall tube row welding technology |
| CN106141511A (en) * | 2015-04-23 | 2016-11-23 | 江苏绿叶锅炉有限公司 | A kind of ultra supercritical large-sized boiler steel pipe membrane wall manufacturing process |
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