CN113664477B - Method for improving post-welding comprehensive performance of large-caliber thin-wall duplex stainless steel joint - Google Patents
Method for improving post-welding comprehensive performance of large-caliber thin-wall duplex stainless steel joint Download PDFInfo
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- CN113664477B CN113664477B CN202111022482.7A CN202111022482A CN113664477B CN 113664477 B CN113664477 B CN 113664477B CN 202111022482 A CN202111022482 A CN 202111022482A CN 113664477 B CN113664477 B CN 113664477B
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- 238000003466 welding Methods 0.000 title claims abstract description 227
- 238000000034 method Methods 0.000 title claims abstract description 59
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 32
- 239000007789 gas Substances 0.000 claims description 29
- 238000005498 polishing Methods 0.000 claims description 18
- 229910052786 argon Inorganic materials 0.000 claims description 16
- 238000005452 bending Methods 0.000 claims description 12
- 239000011324 bead Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005202 decontamination Methods 0.000 claims description 2
- 230000003588 decontaminative effect Effects 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000007730 finishing process Methods 0.000 abstract description 3
- 229910000885 Dual-phase steel Inorganic materials 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 244000137852 Petrea volubilis Species 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- BQJTUDIVKSVBDU-UHFFFAOYSA-L copper;sulfuric acid;sulfate Chemical compound [Cu+2].OS(O)(=O)=O.[O-]S([O-])(=O)=O BQJTUDIVKSVBDU-UHFFFAOYSA-L 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- 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
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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
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
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Abstract
A method for improving the comprehensive performance of a large-caliber thin-wall duplex stainless steel joint after welding belongs to the technical field of welding, solves the technical problems of insufficient welding state performance of a large-caliber thin-wall duplex stainless steel pipe and collapse deformation of a heat treatment state welded pipe, and comprises the following steps: firstly, regulating and controlling a welding process, strictly controlling welding heat input according to the characteristics of a dual-phase steel material in the welding process, and reducing the precipitation of sigma phase; secondly, the heat treatment process is regulated, the relative content of alpha/gamma two phases is regulated and controlled, the harmful sigma phase is eliminated, meanwhile, the stress distribution rule of the welded pipe is calculated and analyzed, an auxiliary device for preventing the welded pipe from deforming in the heat treatment process is assembled in the pipe, the obtained welded pipe has excellent comprehensive performance, no obvious collapse deformation exists, the subsequent finishing process is obviously reduced, and the product performance is greatly improved.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a method for improving the post-welding comprehensive performance of a large-caliber thin-wall duplex stainless steel joint.
Background
The dual-phase stainless steel is an important high-strength corrosion-resistant engineering structural material, the structure of the dual-phase stainless steel mainly comprises ferrite phase and austenite phase, the comprehensive performance of the dual-phase stainless steel is improved through a C-reduction and N-increase technology, and particularly the strength, fatigue performance and anti-sensitization performance are obviously improved.
The duplex stainless steel joint is generally subjected to solution treatment, and sigma phase generated by welding is eliminated through a reasonable post-welding heat treatment process, so that the strength and the grain boundary corrosion resistance of the joint are improved. However, the heat treatment can change the alpha/gamma phase ratio so as to soften the material, and particularly for a thin-wall large-caliber double-phase stainless steel welded pipe, obvious collapse deformation can occur after the heat treatment, the roundness of the pipe is seriously affected, the workload of a finishing process at a later stage is increased, the internal deformation stress of the pipe is increased, and the quality and the production efficiency of the pipe are seriously affected.
At present, a large number of reports are not available on the large-caliber thin-wall duplex stainless steel welding technology, and the prior art needs a large number of finishing procedures on the welded pipe after heat treatment to reduce collapse deformation, and has the disadvantages of high cost, low efficiency and severe working environment. Therefore, the deep research on the welding and post-welding heat treatment process of the large-caliber thin-wall duplex stainless steel has very important significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, solve the technical problems of insufficient welding state performance of a large-caliber thin-wall duplex stainless steel pipe and collapse deformation of a heat treatment state welded pipe, and provide a method for improving the comprehensive performance of a large-caliber thin-wall duplex stainless steel joint after welding. The invention combines welding process regulation and control, auxiliary heat treatment device development and post-welding heat treatment design, is beneficial to improving the production environment and efficiency of the large-caliber thin-wall duplex stainless steel and expands the application market of the duplex stainless steel.
In order to solve the problems, the technical scheme of the invention is as follows:
a method for improving the post-welding comprehensive performance of a large-caliber thin-wall duplex stainless steel joint comprises the following steps:
s1, welding:
s1-1, carrying out pre-welding treatment on a double-phase stainless steel plate to be welded, designing a welding groove into a Y-shaped groove, enabling a blunt edge to be 2+/-0.25 mm, enabling an unilateral groove angle to be 30-32 degrees, and carrying out decontamination, deburring and drying treatment on the groove and an edge area for later use;
s1-2, bending and forming the raw material plate prepared in the step S1-1, fixedly connecting the raw material plate by stitch spot welding, controlling the spot welding sequence and the welding spot distance in the spot welding process, polishing and decontaminating the welding spot after the spot welding is finished, and adjusting the roundness of the pipe;
s1-3, performing plasma arc backing welding on the pipe subjected to spot welding in the step S1-2, wherein the backing welding process parameters are as follows: the welding current is 240-260A, the welding voltage is 29-32V, the welding speed is 90-110mm/min, the ion gas flow is 4-5L/min, the shielding gas is argon, and the gas flow is 20-25L/min; then carefully inspecting and polishing the welded seam after backing welding;
s1-4, performing straight seam filling welding on the tube blank subjected to the bottoming welding in the step S1-3, wherein the straight seam filling welding process parameters are as follows: welding wires with the model ER2209 and the diameter phi of 1.2mm are selected as welding materials, the welding current is 270-300A, the welding voltage is 28-30V, the welding speed is 90-110mm/min, the wire feeding speed is 1400-1600mm/min, the shielding gas adopts argon, the gas flow is 20-25L/min, and the temperature between the layers of a welding bead is strictly controlled to be less than or equal to 100 ℃ in the straight joint filling welding process;
s1-5, carrying out cover welding on the welding seam after the straight seam filling welding in the step S1-4, wherein the cover welding process parameters are as follows: welding materials are selected from welding wires with the model number of ER2209 and the diameter of phi 1.2mm, the welding current is 270-300A, the welding voltage is 14-16V, the welding speed is 90-110mm/min, the wire feeding speed is 1400-1600mm/min, the shielding gas is argon, and the gas flow is 20-25L/min; polishing the residual height of an inner weld seam in the range of about 101.6mm from the two sides of the steel pipe to the pipe end after cover surface welding to finish welding of the large-caliber thin-wall duplex stainless steel joint, and then performing X-ray flaw detection and appearance detection on the joint;
s2, post-welding heat treatment:
s2-1, installing an anti-deformation bushing in the inner cavity of the joint manufactured in the step S1-5, and fixing an anti-deformation rib plate on the outer wall of the joint by adopting TIG spot welding;
s2-2, solution treatment: carrying out solution treatment on the joint blank fixed in the step S2-1, wherein the solution treatment process parameters are as follows: the heat treatment temperature is 1040-1100 ℃, the heating speed is 10 ℃/min, the heat is preserved for 15min, and then the water is cooled to room temperature;
s2-3, removing the deformation-preventing lining and the deformation-preventing rib plate arranged on the joint after the solution treatment in the step S2-2 is finished, and polishing the spot welding position to finish the postweld heat treatment of the large-caliber thin-wall duplex stainless steel joint.
Further, in the step S1-2, the pitch of the welding spots is 50mm.
Further, in the step S1-4, the diameter of the tube blank is 800-1200mm, the length of the tube blank is 6000mm, and the welding thickness is 5-8mm.
Further, the purity of the argon gas in the steps S1-3, S1-4 and S1-5 is 99.99%.
Further, in the steps S1-4 and S1-5, the welding of the next welding pass is performed after the previous welding pass is detected and cleaned.
Compared with the prior art, the invention has the beneficial effects that:
1. the welding process is regulated and controlled, the welding heat input is strictly controlled according to the characteristics of the dual-phase steel material in the welding process, and the precipitation of sigma phase is reduced;
2. the heat treatment process is regulated, the relative content of alpha/gamma two phases is regulated and controlled, the harmful sigma phase is eliminated, meanwhile, the stress distribution rule of the welded pipe is calculated and analyzed, an auxiliary device for preventing the welded pipe from deforming in the heat treatment process is assembled in the pipe, the obtained welded pipe has excellent comprehensive performance, no obvious collapse deformation, the subsequent finishing process is obviously reduced, the product performance is greatly improved, the cost is reduced, and the working environment is improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
Examples
The 2205 duplex stainless steel deformed by crimping is used as a base material, the dimensional parameters of the material are 6000mm (length) ×8mm (thickness) ×1200mm (diameter), and the circularity of the material is ensured by a bending process before welding.
A method for improving the post-welding comprehensive performance of a large-caliber thin-wall duplex stainless steel joint comprises the following steps:
s1, welding:
s1-1, carrying out pre-welding treatment on a duplex stainless steel plate to be welded, wherein a welding groove is designed into a Y-shaped groove, a blunt edge is 1.75mm, the angle of a unilateral groove is 30 degrees, and a welding end face and a nearby area are cleaned by a mechanical polishing method before welding: removing defects such as oxide skin, burrs and the like in the groove and the nearby area by utilizing an angle grinder, removing greasy dirt and water quality by adopting sand paper and rag, ensuring the cleanliness of a welding position, and keeping for later use;
s1-2, bending and forming the raw material plate prepared in the step S1-1, fixedly connecting the raw material plate by stitch spot welding, uniformly arranging welding spot positions in the spot welding process, wherein the distance between the welding spots is 50mm, polishing and decontaminating the welding spot positions after the spot welding is finished, and adjusting the roundness of the pipe;
s1-3, performing plasma arc backing welding on the pipe subjected to spot welding in the step S1-2, wherein the backing welding process parameters are as follows: the welding current is 240A, the welding voltage is 29V, the welding speed is 90mm/min, the ion gas flow is 4L/min, the shielding gas adopts argon with the purity of 99.99 percent, and the gas flow is 20L/min; then carefully checking the welded seam after the bottoming welding to ensure the single-sided welding double-sided forming, and finally polishing and slag removing the welded seam;
s1-4, performing straight seam filling welding on the tube blank subjected to the bottoming welding in the step S1-3 by adopting argon tungsten-arc welding, wherein the straight seam filling welding technological parameters are as follows: welding wires with the model ER2209 and the diameter phi of 1.2mm are selected as welding materials, the welding current is 270-300A, the welding voltage is 28V, the welding speed is 90mm/min, the wire feeding speed is 1400mm/min, the shielding gas adopts argon, the gas flow is 20L/min, the temperature between the welding bead layers is strictly controlled to be less than or equal to 100 ℃ in the straight joint filling welding process, and the welding of the next welding bead is carried out after the detection and cleaning of the previous welding bead;
s1-5, performing cover welding (1 pass) on the welding seam subjected to the straight seam filling welding in the step S1-4, wherein the cover welding process parameters are as follows: welding wires with the model number of ER2209 and the diameter of phi 1.2mm are selected as welding materials, the welding current is 270A, the welding voltage is 14V, the welding speed is 90mm/min, the wire feeding speed is 1400mm/min, the protective gas is argon with the purity of 99.99%, and the gas flow is 20L/min; polishing the surplus height of the inner weld seam in the range of about 101.6mm from the two sides of the steel pipe to the pipe end after cover surface welding, and finishing the welding of the large-caliber thin-wall duplex stainless steel joint; then X-ray flaw detection is carried out on the joint according to QW191.1 requirements, and the appearance of the weld joint is detected according to the standard of ASME boilers and pressure vessels, volume IX and QW-194; and detecting the tensile strength of the joint, wherein the strength is 130.0MPa, the elongation is 26.5%, and the joint meets the standard requirement;
s2, post-welding heat treatment:
s2-1, installing an anti-deformation bushing in the inner cavity of the joint manufactured in the step S1-5, and fixing an anti-deformation rib plate on the outer wall of the joint by adopting TIG spot welding;
s2-2, solution treatment: carrying out solution treatment on the joint blank fixed in the step S2-1, wherein the solution treatment process parameters are as follows: the heat treatment temperature is 1040 ℃, the heating speed is 10 ℃/min, the heat is preserved for 15min, and then the water is cooled to room temperature;
s2-3, removing the deformation-preventing lining and the deformation-preventing rib plate arranged on the joint after the solution treatment in the step S2-2 is finished, wherein the welded pipe does not find obvious collapse deformation, and polishing the spot welding position to finish the postweld heat treatment of the large-caliber thin-wall duplex stainless steel joint.
Testing the intergranular corrosion resistance of the joint according to ASTM A262E standard, preparing sulfuric acid-copper sulfate solution as a corrosion medium, boiling a joint sample in the corrosion medium for 16 hours, then bending, wherein the diameter of a bending core is 5mm, the bending angle is 180 degrees, and no crack is found on the surface after the surface is observed by a 10-time magnifying glass; tensile property test is carried out according to ASTM A370 standard, the tensile strength obtained by experiment is 800MPa, the yield strength is 590MPa, and the elongation is 30%, which all meet the process evaluation requirement; the microstructure of the joint is analyzed by metallographic observation, the alpha/gamma two-phase structure ratio is 5.7, and no obvious sigma phase appears.
In summary, this example 1:
(1) Designing a welding process of the system, calculating heat input quantity, evaluating the rule of influence of welding heat input on joint performance by combining tissue analysis and performance test, and strictly adopting welding process parameters with the minimum heat input quantity to finish straight seam welding so as to ensure that the welding process generates minimum residual stress and deformation;
(2) Designing a post-welding heat treatment process of the system, and analyzing the quantity and the distribution of sigma phases of a heat treatment state welding line center and a heat affected zone and the proportion of the alpha/gamma phases through OM, XRD and SEM detection;
(3) And performing stress corrosion and mechanical property test, and establishing an internal relation between a welding process, a heat treatment process, a microstructure and mechanical properties through comprehensive analysis and comparison to obtain the welding joint with excellent structure and standard performance.
Examples
The 2205 duplex stainless steel deformed by crimping is used as a base material, the dimensional parameters of the material are 6000mm (length) ×5mm (thickness) ×800mm (diameter), and the circularity of the material is ensured by a bending process before welding.
A method for improving the post-welding comprehensive performance of a large-caliber thin-wall duplex stainless steel joint comprises the following steps:
s1, welding:
s1-1, carrying out pre-welding treatment on a duplex stainless steel plate to be welded, wherein a welding groove is designed into a Y-shaped groove, a blunt edge is 2.25mm, the angle of a single-side groove is 32 degrees, and a welding end face and a nearby area are cleaned by a mechanical polishing method before welding: removing defects such as oxide skin, burrs and the like in the groove and the nearby area by utilizing an angle grinder, removing greasy dirt and water quality by adopting sand paper and rag, ensuring the cleanliness of a welding position, and keeping for later use;
s1-2, bending and forming the raw material plate prepared in the step S1-1, fixedly connecting the raw material plate by stitch spot welding, uniformly arranging welding spot positions in the spot welding process, wherein the distance between the welding spots is 50mm, polishing and decontaminating the welding spot positions after the spot welding is finished, and adjusting the roundness of the pipe;
s1-3, performing plasma arc backing welding on the pipe subjected to spot welding in the step S1-2, wherein the backing welding process parameters are as follows: the welding current is 260A, the welding voltage is 32V, the welding speed is 110mm/min, the ion gas flow is 5L/min, the shielding gas adopts argon with the purity of 99.99%, and the gas flow is 25L/min; then carefully checking the welded seam after the bottoming welding to ensure the single-sided welding double-sided forming, and finally polishing and slag removing the welded seam;
s1-4, performing straight seam filling welding on the tube blank subjected to the bottoming welding in the step S1-3 by adopting argon tungsten-arc welding, wherein the straight seam filling welding technological parameters are as follows: welding wires with the model ER2209 and the diameter phi of 1.2mm are selected as welding materials, the welding current is 300A, the welding voltage is 29V, the welding speed is 110mm/min, the wire feeding speed is 1600mm/min, the shielding gas adopts argon, the gas flow is 25L/min, the temperature between the welding bead layers is strictly controlled to be less than or equal to 100 ℃ in the process of straight joint filling welding, and the welding of the next welding bead is carried out after the detection and cleaning of the previous welding bead;
s1-5, performing cover welding (1 pass) on the welding seam subjected to the straight seam filling welding in the step S1-4, wherein the cover welding process parameters are as follows: welding wires with the model number of ER2209 and the diameter of phi 1.2mm are selected as welding materials, the welding current is 300A, the welding voltage is 15V, the welding speed is 110mm/min, the wire feeding speed is 1600mm/min, the protective gas is argon with the purity of 99.99%, and the gas flow is 25L/min; polishing the surplus height of the inner weld seam in the range of about 101.6mm from the two sides of the steel pipe to the pipe end after cover surface welding, and finishing the welding of the large-caliber thin-wall duplex stainless steel joint; then X-ray flaw detection is carried out on the joint according to QW191.1 requirements, and the appearance of the weld joint is detected according to the standard of ASME boilers and pressure vessels, volume IX and QW-194; the tensile strength of the joint is detected, the strength is 134.7MPa, the elongation is 27.3%, and the joint meets the standard requirement;
s2, post-welding heat treatment:
s2-1, installing an anti-deformation bushing in the inner cavity of the joint manufactured in the step S1-5, and fixing an anti-deformation rib plate on the outer wall of the joint by adopting TIG spot welding;
s2-2, solution treatment: carrying out solution treatment on the joint blank fixed in the step S2-1, wherein the solution treatment process parameters are as follows: the heat treatment temperature is 1100 ℃, the heating speed is 10 ℃/min, the heat is preserved for 15min, and then the water is cooled to room temperature;
s2-3, removing the deformation-preventing lining and the deformation-preventing rib plate arranged on the joint after the solution treatment in the step S2-2 is finished, wherein the welded pipe does not find obvious collapse deformation, and polishing the spot welding position to finish the postweld heat treatment of the large-caliber thin-wall duplex stainless steel joint.
Testing the intergranular corrosion resistance of the joint according to ASTM A262E standard, preparing sulfuric acid-copper sulfate solution as a corrosion medium, boiling a joint sample in the corrosion medium for 16 hours, then bending, wherein the diameter of a bending core is 5mm, the bending angle is 180 degrees, and no crack is found on the surface after the surface is observed by a 10-time magnifying glass; tensile property test is carried out according to ASTM A370 standard, the tensile strength obtained by experiment is 820MPa, the yield strength is 600MPa, the elongation is 32%, and all the requirements of process evaluation are met; the microstructure of the joint is analyzed by metallographic observation, the alpha/gamma two-phase structure ratio is 5.5, and no obvious sigma phase appears.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A method for improving the post-welding comprehensive performance of a large-caliber thin-wall duplex stainless steel joint is characterized by comprising the following steps:
s1, welding:
s1-1, carrying out pre-welding treatment on a double-phase stainless steel plate to be welded, designing a welding groove into a Y-shaped groove, enabling a blunt edge to be 2+/-0.25 mm, enabling an unilateral groove angle to be 30-32 degrees, and carrying out decontamination, deburring and drying treatment on the groove and an edge area for later use;
s1-2, bending and forming the raw material plate prepared in the step S1-1, fixedly connecting the raw material plate by stitch spot welding, controlling the spot welding sequence and the welding spot distance in the spot welding process, polishing and decontaminating the welding spot after the spot welding is finished, and adjusting the roundness of the pipe;
s1-3, performing plasma arc backing welding on the pipe subjected to spot welding in the step S1-2, wherein the backing welding process parameters are as follows: the welding current is 240-260A, the welding voltage is 29-32V, the welding speed is 90-110mm/min, the ion gas flow is 4-5L/min, the shielding gas is argon, and the gas flow is 20-25L/min; then carefully inspecting and polishing the welded seam after backing welding;
s1-4, performing straight seam filling welding on the tube blank subjected to the bottoming welding in the step S1-3, wherein the straight seam filling welding process parameters are as follows: welding wires with the model ER2209 and the diameter phi of 1.2mm are selected as welding materials, the welding current is 270-300A, the welding voltage is 28-30V, the welding speed is 90-110mm/min, the wire feeding speed is 1400-1600mm/min, the shielding gas adopts argon, the gas flow is 20-25L/min, and the temperature between the layers of a welding bead is strictly controlled to be less than or equal to 100 ℃ in the straight joint filling welding process;
s1-5, carrying out cover welding on the welding seam after the straight seam filling welding in the step S1-4, wherein the cover welding process parameters are as follows: welding materials are selected from welding wires with the model number of ER2209 and the diameter of phi 1.2mm, the welding current is 270-300A, the welding voltage is 14-16V, the welding speed is 90-110mm/min, the wire feeding speed is 1400-1600mm/min, the shielding gas is argon, and the gas flow is 20-25L/min; polishing the surplus height of the inner weld seam in the range of 101.6mm from the two edges of the steel pipe after cover surface welding to finish welding of the large-caliber thin-wall duplex stainless steel joint, and then performing X-ray flaw detection and appearance detection on the joint;
s2, post-welding heat treatment:
s2-1, installing an anti-deformation bushing in the inner cavity of the joint manufactured in the step S1-5, and fixing an anti-deformation rib plate on the outer wall of the joint by adopting TIG spot welding;
s2-2, solution treatment: carrying out solution treatment on the joint blank fixed in the step S2-1, wherein the solution treatment process parameters are as follows: the heat treatment temperature is 1040-1100 ℃, the heating speed is 10 ℃/min, the heat is preserved for 15min, and then the water is cooled to room temperature;
s2-3, removing the deformation-preventing lining and the deformation-preventing rib plate arranged on the joint after the solution treatment in the step S2-2 is finished, and polishing the spot welding position to finish the postweld heat treatment of the large-caliber thin-wall duplex stainless steel joint.
2. The method for improving the post-welding comprehensive performance of the large-caliber thin-wall duplex stainless steel joint according to claim 1, which is characterized by comprising the following steps of: in the step S1-2, the welding spot spacing is 50mm.
3. The method for improving the post-welding comprehensive performance of the large-caliber thin-wall duplex stainless steel joint according to claim 1, which is characterized by comprising the following steps of: in the step S1-4, the diameter of the tube blank is 800-1200mm, the length of the tube blank is 6000mm, and the welding thickness is 5-8mm.
4. The method for improving the post-welding comprehensive performance of the large-caliber thin-wall duplex stainless steel joint according to claim 1, which is characterized by comprising the following steps of: the purity of the argon in the steps S1-3, S1-4 and S1-5 is 99.99%.
5. The method for improving the post-welding comprehensive performance of the large-caliber thin-wall duplex stainless steel joint according to claim 1, which is characterized by comprising the following steps of: in the steps S1-4 and S1-5, the welding of the next welding bead is carried out after the detection and cleaning of the previous welding bead.
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