CN116329714A - Method for welding lining pipe - Google Patents
Method for welding lining pipe Download PDFInfo
- Publication number
- CN116329714A CN116329714A CN202310594200.3A CN202310594200A CN116329714A CN 116329714 A CN116329714 A CN 116329714A CN 202310594200 A CN202310594200 A CN 202310594200A CN 116329714 A CN116329714 A CN 116329714A
- Authority
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- Prior art keywords
- integral flange
- welding
- lining pipe
- stainless steel
- face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 81
- 239000010935 stainless steel Substances 0.000 claims abstract description 81
- 239000002344 surface layer Substances 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims abstract description 14
- 230000007704 transition Effects 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 238000003754 machining Methods 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 238000005554 pickling Methods 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 230000008602 contraction Effects 0.000 abstract description 3
- 238000010583 slow cooling Methods 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The application relates to the technical field of pressure vessel equipment, and provides a lining pipe assembly welding method, which comprises the following steps: s1, turning the outer diameter of a stainless steel liner tube to be equal to the inner diameter of an integral flange; s2, respectively machining chamfer angles at the upper end part and the lower end part of the inner wall of the integral flange; s3, heating the integral flange, inserting the stainless steel lining pipe into the integral flange, extending the integral flange from two ends, and carrying out heat preservation and slow cooling on the integral flange to the pre-welding preheating temperature required by design; s4, welding chamfer angles by adopting dissimilar steel welding materials; s5, sequentially overlaying a transition layer and a surface layer on the upper end face and the lower end face of the integral flange respectively. The integral flange is heated to a preset temperature range, the stainless steel liner tube can be easily inserted into the inner diameter of the integral flange by utilizing the principle of thermal expansion and cold contraction, then the integral structure is cooled, and the integral flange is tightly assembled with the stainless steel liner tube.
Description
Technical Field
The application relates to the technical field of pressure vessel equipment, in particular to a lining pipe assembling and welding method.
Background
The main part material is stainless steel composite sheet or inner wall build-up welding stainless steel's high temperature, high pressure, corrosion-resistant pressure vessel, and the mouth of pipe is plug-in type takeover build-up welding stainless steel material, but some internal diameter DN is less than or equal to 40 mm's mouth of pipe, and the inner wall can't carry out build-up welding, if change for stainless steel material, then be difficult to guarantee and can't carry out nondestructive test because of dissimilar steel welded joint welding quality, lead to appearing the fracture and reveal in the equipment operation in-process easily, consequently, the prior art adopts lining stainless steel bushing pipe, whole flange seal face and tip build-up welding stainless steel's structure.
The stainless steel lining pipe in the prior art is that the two ends are about 10-15mm away from the sealing surface of the integral flange and the end surface of the connecting pipe, a gap of 0.5mm is formed between the stainless steel lining pipe and the inner wall of the integral flange, and as the pipe wall of the stainless steel lining pipe is thin (about 4 mm), the stainless steel lining pipe is welded with a base material, a transition layer is required to be welded and then a surface layer is required to be welded, and the conditions that the corrosion-resistant layer is thin or the stainless steel lining pipe burns through and the like are extremely easy to occur, so that liquid in the pressure container corrodes and penetrates from the position and leaks from a leakage detection hole in the field use process.
Therefore, how to provide a stainless steel liner that fits tightly with the integral flange is a current problem that is highly desirable to those skilled in the art.
Disclosure of Invention
In view of this, the present application has realized providing a stainless steel liner that fits tightly with an integral flange.
In order to achieve the above purpose, the present application provides the following technical solutions:
a lining pipe assembling and welding method comprises the following steps: s1, selecting a stainless steel liner tube with the outer diameter larger than the inner diameter of the integral flange according to the inner diameter of the integral flange, turning the outer diameter of the stainless steel liner tube to be equal to the inner diameter of the integral flange, and enabling the length of the stainless steel liner tube to be longer than that of the integral flange; s2, respectively machining chamfer angles at the upper end part and the lower end part of the inner wall of the integral flange; s3, heating the integral flange to 450-500 ℃, preserving heat for 1-3 hours, covering and preserving heat outside by using heat preservation cotton, inserting a stainless steel lining pipe into the integral flange, extending out of the integral flange at two ends, and preserving heat and slowly cooling the integral flange to a pre-welding preheating temperature required by design; s4, adopting dissimilar steel welding materials and manual argon tungsten-arc welding for chamfering; s5, sequentially overlaying a transition layer and a surface layer on the upper end face and the lower end face of the integral flange respectively, wherein the surface layer protrudes out of the end face of the stainless steel liner tube, and the surface layer is machined to be flush with the end face of the stainless steel liner tube.
Optionally, S1 further comprises the step of carrying out pickling passivation treatment on the inner surface and the outer surface of the stainless steel lining pipe.
Optionally, the lining pipe assembly welding method further comprises: and S6, assembling and welding the processed integral flange and the cylinder body, and performing stress relief heat treatment after assembling and welding.
Alternatively, the stainless steel liner has a wall thickness of 4-5mm and the outer diameter of the stainless steel liner before turning is 2-3mm larger than the inner diameter of the integral flange.
Optionally, the outer diameter of the stainless steel liner is turned to equal the inner diameter of the integral flange with a deviation of + -0.1 mm.
Alternatively, the chamfer is a 3mm x 45 ° chamfer.
Alternatively, the stainless steel liner tube extends 6-7mm each after being inserted into the integral flange.
Alternatively, the weld width and fillet height at the chamfer location is 2-4mm and the concave rounded transition.
Optionally, the facing layer protrudes 9-10mm from the end face of the integral flange.
Alternatively, the overlay welding is performed by adopting a planar argon tungsten-arc automatic overlay welding machine.
The lining pipe welding method provided by the application comprises the following steps of: s1, selecting a stainless steel liner tube with the outer diameter larger than the inner diameter of the integral flange according to the inner diameter of the integral flange, turning the outer diameter of the stainless steel liner tube to be equal to the inner diameter of the integral flange, and enabling the length of the stainless steel liner tube to be longer than that of the integral flange; s2, respectively machining chamfer angles at the upper end part and the lower end part of the inner wall of the integral flange; s3, heating the integral flange to 450-500 ℃, preserving heat for 1-3 hours, covering and preserving heat outside by using heat preservation cotton, inserting a stainless steel lining pipe into the integral flange, extending out of the integral flange at two ends, and preserving heat and slowly cooling the integral flange to a pre-welding preheating temperature required by design; s4, adopting dissimilar steel welding materials and manual argon tungsten-arc welding for chamfering; s5, sequentially overlaying a transition layer and a surface layer on the upper end face and the lower end face of the integral flange respectively, wherein the surface layer protrudes out of the end face of the stainless steel liner tube, and the surface layer is machined to be flush with the end face of the stainless steel liner tube. The method comprises the steps of selecting a stainless steel liner tube with larger outer diameter, machining a chamfer angle on the inner wall of the integral flange, preparing for welding, wherein the chamfer angle is used as a welding point with the stainless steel liner tube, two ends of the stainless steel liner tube extend out of the integral flange, overlaying a transition layer and a surface layer on the integral flange, heating the integral flange to a preset temperature range, utilizing a heat expansion and cold contraction principle, at the moment, the stainless steel liner tube can be easily inserted into the inner diameter of the integral flange, cooling the integral structure, tightly assembling the integral flange with the stainless steel liner tube, welding the chamfer angle by adopting dissimilar steel welding materials, further realizing the tight and fixedly connecting of the stainless steel liner tube and the integral flange, welding the transition layer and the surface layer on the upper end face and the lower end face of the integral flange, further realizing the tight and fixedly connecting of the stainless steel liner tube and the integral flange, and overlaying the surface layer protrudes out of the end face of the stainless steel liner tube, and flushing the end face of the stainless steel liner tube by machining.
Drawings
The novel features believed characteristic of the application are set forth with particularity in the appended claims. A better understanding of the features and advantages of the present application will be obtained by reference to the following detailed description that sets forth illustrative embodiments, in which the principles of the present application are utilized, and the accompanying drawings. The drawings are only for purposes of illustrating embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like elements throughout the figures.
In the drawings: fig. 1 is a schematic structural view of a stainless steel liner tube and integral flange assembly welding provided by the application.
In the drawings: fig. 2 is a schematic structural diagram of the welding of the cylinder and the integral flange provided by the application.
In fig. 1 to 2: 1 is an integral flange, 2 is a stainless steel liner tube, 3 is a cylinder, 4 is a surface layer, 5 is a transition layer, 6 is a chamfer, and 7 is a leak detection hole.
Detailed Description
The application provides a lining pipe assembling and welding method, which realizes that a stainless steel lining pipe tightly assembled with an integral flange is provided.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings of the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
FIG. 1 is a schematic view of a stainless steel liner and integral flange assembly welding structure provided herein; fig. 2 is a schematic structural diagram of the welding of the cylinder and the integral flange provided by the application.
The lining pipe welding method provided by the application comprises the following steps: s1, according to the inner diameter of the integral flange 1, selecting a stainless steel lining pipe 2 with the outer diameter larger than the inner diameter of the integral flange 1, turning the outer diameter of the stainless steel lining pipe 2 to be equal to the inner diameter of the integral flange 1, and enabling the length of the stainless steel lining pipe 2 to be longer than that of the integral flange 1; s2, machining chamfers 6 on the upper end and the lower end of the inner wall of the integral flange 1 respectively; s3, heating the integral flange 1 to 450-500 ℃, preserving heat for 1-3 hours, covering and preserving heat outside by using heat preservation cotton, inserting a stainless steel liner tube 2 into the integral flange 1, extending out of the integral flange 1 at two ends, and preserving heat and slowly cooling the integral flange 1 to a pre-welding preheating temperature required by design; s4, adopting dissimilar steel welding materials and manual argon tungsten-arc welding to weld the chamfer 6; s5, sequentially overlaying a transition layer 5 and a surface layer 4 on the upper end face and the lower end face of the integral flange 1 respectively, wherein the surface layer 4 protrudes out of the end face of the stainless steel liner tube 2, and the surface layer 4 is machined to be flush with the end face of the stainless steel liner tube 2. The integral flange 1 can be also called a pipe flange component, a stainless steel lining pipe 2 with larger outer diameter is selected, the inner diameter of the integral flange 1 can be matched after turning, a chamfer 6 is machined on the inner wall of the integral flange 1, preparation is made for welding, the chamfer 6 serves as a welding point with the stainless steel lining pipe 2, two ends of the stainless steel lining pipe 2 extend out of the integral flange 1, a transition layer 5 and a surface layer 4 are deposited on the integral flange 1, the integral flange 1 is heated to a preset temperature range, the stainless steel lining pipe 2 can be easily inserted into the inner diameter of the integral flange 1 by utilizing the principle of expansion and contraction, then the integral structure is cooled, the integral flange 1 is tightly assembled with the stainless steel lining pipe 2, the chamfer 6 is welded by adopting dissimilar steel welding materials, the tight and firm connection between the stainless steel lining pipe 2 and the integral flange 1 is further realized, the tight firm connection between the upper end face and the lower end face of the integral flange 1 is further realized, the surface layer 4 is required to protrude out of the end face of the stainless steel lining pipe 2, and the end face of the integral flange 2 is processed to be flush with the end face of the stainless steel lining pipe 2 by machining, and the integral flange 2 is assembled tightly by adopting the method of the integral flange 2.
In a specific embodiment of the present application, S1 further includes performing pickling passivation treatment on the inner and outer surfaces of the stainless steel liner 2. The pickling passivation treatment can enhance the corrosion resistance of the stainless steel lining pipe 2.
In a specific embodiment of the present application, further includes: s6, assembling and welding the processed integral flange 1 and the cylinder body 3, and performing stress relief heat treatment after assembling and welding. The stress relief heat treatment is helpful for improving the stability of the assembly welding structure.
In a specific embodiment of the present application, the wall thickness of the stainless steel liner tube 2 is 4-5mm, and the outer diameter of the stainless steel liner tube 2 before turning is 2-3mm larger than the inner diameter of the integral flange 1. The wall thickness of 4-5mm is the preferred size data, can assemble into the integral flange 1 by cutting 2-3mm, and the wall thickness is remained by 2mm, so that the condition that the stainless steel liner tube 2 burns through is not easy to happen, and the medium can not corrode and penetrate from the position and leak from the leak detection hole 7 in the field use process.
In a specific embodiment of the present application, the outer diameter of the stainless steel liner tube 2 is turned to be equal to the inner diameter of the integral flange 1 with a deviation of + -0.1 mm. Controlling the turning deviation to be + -0.1 mm is a key to ensure that the stainless steel liner tube 2 can be inserted into the integral flange 1 without excessive gaps.
In a specific embodiment of the present application, chamfer 6 is a 3mm x 45 ° chamfer. A chamfer angle of 3mm by 45 degrees is a preferable technical scheme, which is beneficial to welding.
In one embodiment of the present application, the stainless steel liner 2 extends 6-7mm each at both ends after being inserted into the integral flange 1. The two ends extend out by 6-7mm respectively, which is a preferable technical proposal.
In a specific embodiment of the present application, the weld width and fillet height at the chamfer 6 location is 2-4mm and the concave rounded transition. The width of the welding seam and the height of the welding leg are 2-4mm, which is a preferable technical proposal beneficial to construction.
In one embodiment of the present application, the facing layer 4 protrudes from the end face 9-10mm of the integral flange 1. The end face 9-10mm protruding from the integral flange 1 is the preferred technical solution.
In one embodiment of the present application, the overlay welding is performed using a planar argon tungsten-arc automatic overlay welding machine. The automatic surfacing machine for planar argon tungsten-arc welding is a preferable technical scheme.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some embodiments, well-known structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
While exemplary embodiments of the present application have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Many modifications, changes, and substitutions will now occur to those skilled in the art without departing from the application. It should be understood that various alternatives to the embodiments of the present application described herein may be employed in practicing the application. The following claims are intended to define the scope of the present application and are therefore to cover structures within the scope of these claims and their equivalents.
Claims (10)
1. The lining pipe assembling and welding method is characterized by comprising the following steps of:
s1, selecting a stainless steel lining pipe (2) with the outer diameter larger than the inner diameter of the integral flange (1) according to the inner diameter of the integral flange (1), turning the outer diameter of the stainless steel lining pipe (2) to be equal to the inner diameter of the integral flange (1), wherein the length of the stainless steel lining pipe (2) is larger than the length of the integral flange (1);
s2, machining chamfers (6) on the upper end part and the lower end part of the inner wall of the integral flange (1) respectively;
s3, heating the integral flange (1) to 450-500 ℃, preserving heat for 1-3 hours, covering the outer side by using heat preservation cotton, preserving heat, inserting the stainless steel lining pipe (2) into the integral flange (1), extending the two ends of the stainless steel lining pipe out of the integral flange (1), and preserving heat and slowly cooling the integral flange (1) to a pre-welding preheating temperature required by design;
s4, welding the chamfer angle (6) by adopting dissimilar steel welding materials and manual argon tungsten-arc welding;
s5, sequentially overlaying a transition layer (5) and a surface layer (4) on the upper end face and the lower end face of the integral flange (1), wherein the surface layer (4) protrudes out of the end face of the stainless steel lining pipe (2), and the surface layer (4) is machined to be flush with the end face of the stainless steel lining pipe (2).
2. A method of welding a lining pipe as claimed in claim 1, wherein S1 further comprises pickling and passivating the inner and outer surfaces of the stainless steel lining pipe (2).
3. The liner tube assembly welding method of claim 2, further comprising: s6, assembling and welding the processed integral flange (1) and the cylinder body (3), and performing stress relief heat treatment after assembling and welding.
4. A method of welding a lining pipe as claimed in claim 3, wherein the wall thickness of the stainless steel lining pipe (2) is 4-5mm, and the outer diameter of the stainless steel lining pipe (2) before turning is 2-3mm larger than the inner diameter of the integral flange (1).
5. A method of welding a lining pipe as claimed in claim 4, characterized in that the outer diameter of the stainless steel lining pipe (2) is turned to be equal to the inner diameter of the integral flange (1) with a deviation of ± 0.1mm.
6. A method of welding a lining pipe as claimed in claim 5, wherein the chamfer (6) is a 3mm x 45 ° chamfer.
7. A method of welding a lining pipe as claimed in claim 6, wherein the stainless steel lining pipe (2) extends 6-7mm each after insertion into the integral flange (1).
8. The lining pipe fitting welding method as claimed in claim 7, wherein the weld width and the fillet height at the chamfer (6) position are 2-4mm, and the concave rounded transition is made.
9. A method of welding a lining pipe as claimed in claim 8, wherein the facing layer (4) protrudes 9-10mm from the end face of the integral flange (1).
10. The method for installing and welding the lining pipe according to claim 9, wherein the overlaying welding is performed by adopting a planar argon tungsten-arc welding automatic overlaying welding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310594200.3A CN116329714A (en) | 2023-05-25 | 2023-05-25 | Method for welding lining pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310594200.3A CN116329714A (en) | 2023-05-25 | 2023-05-25 | Method for welding lining pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116329714A true CN116329714A (en) | 2023-06-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310594200.3A Pending CN116329714A (en) | 2023-05-25 | 2023-05-25 | Method for welding lining pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116329714A (en) |
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-
2023
- 2023-05-25 CN CN202310594200.3A patent/CN116329714A/en active Pending
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