CN116275699A - Sintered flux for submerged arc girth welding of duplex pipes and preparation method thereof - Google Patents
Sintered flux for submerged arc girth welding of duplex pipes and preparation method thereof Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 166
- 230000004907 flux Effects 0.000 title claims abstract description 94
- 238000002360 preparation method Methods 0.000 title abstract description 15
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 62
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 37
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 31
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 29
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 26
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 23
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 22
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 22
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000010436 fluorite Substances 0.000 claims abstract description 22
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 22
- 239000011572 manganese Substances 0.000 claims abstract description 22
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 22
- 229910000863 Ferronickel Inorganic materials 0.000 claims abstract description 21
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 17
- 239000004579 marble Substances 0.000 claims abstract description 15
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 11
- 238000005245 sintering Methods 0.000 claims abstract description 11
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 8
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 claims abstract description 8
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 5
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 235000010755 mineral Nutrition 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 7
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 229910000676 Si alloy Inorganic materials 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 claims description 4
- 238000002386 leaching Methods 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 229910000691 Re alloy Inorganic materials 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 239000001095 magnesium carbonate Substances 0.000 claims description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 3
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 3
- 239000002893 slag Substances 0.000 abstract description 49
- 229910000831 Steel Inorganic materials 0.000 abstract description 19
- 239000010959 steel Substances 0.000 abstract description 19
- 239000011324 bead Substances 0.000 abstract description 12
- 230000000052 comparative effect Effects 0.000 description 22
- 229910052751 metal Inorganic materials 0.000 description 19
- 239000002184 metal Substances 0.000 description 19
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- 230000000694 effects Effects 0.000 description 11
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- 229910052739 hydrogen Inorganic materials 0.000 description 4
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
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- 239000003345 natural gas Substances 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Classifications
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/362—Selection of compositions of fluxes
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention relates to the technical field of oil and gas pipeline welding, in particular to sintered flux for double-pipe submerged arc girth welding and a preparation method thereof. The sintered flux for the double-pipe submerged arc girth welding comprises the following chemical components in percentage by mass: caF (CaF) 2 :5~15%、MgO:15~20%、Al 2 O 3 :15~20%、CaO:2~5%、MnO:3~10%、BaCO 3 :5~10%、TiO 2 :3~10%、Ni:1~5%、B:0.8~1.5%、Re:1~0.05%、SiO 2 : 15-20% of iron powder: 10-30%, S is less than or equal to 0.015%, and P is less than or equal to 0.020%. The chemical components required by sintering flux are added in the forms of fluorite, fused magnesia, bauxite, marble, barium carbonate, manganese ore, rutile, rare earth ferrosilicon, ferronickel, ferroboron and iron powder, and the welding flux is free from loss of welding seam slag, easy in deslagging, and smooth and regular in welding bead in the submerged arc welding process of the X80 submerged arc steel pipe with the large wall thickness of more than 20 mm.
Description
Technical Field
The invention relates to the technical field of oil and gas pipeline welding, in particular to sintered flux for double-pipe submerged arc girth welding and a preparation method thereof.
Background
The double connecting pipe is used as a steel pipe for welding two steel pipes together in an on-site prefabrication mode. By the method of double connecting pipes, the construction working hour of the pipeline can be sufficiently and effectively shortened, and the expected targets of short, flat and fast engineering can be greatly met. The submerged arc welding process has the advantages of high production efficiency, good process stability, uniform structure of the obtained welding seam and excellent performance of the welding joint, becomes a main process for double-connecting-pipe welding, and has been widely applied to domestic and foreign long-distance pipeline construction for a long time.
Unlike conventional spiral and longitudinal submerged arc spiral and horizontal welding, the duplex tube is welded in a circumferential direction. The inner and outer welding planes of the process are smaller, the position change of the welding spot is larger, the submerged arc welding process with small line energy is mostly adopted, the welding speed is less than 1m/min, the multi-layer welding is mostly adopted, and the line energy is generally not more than 15KJ/cm. The conventional welding flux is more focused on the welding speed and efficiency, the welding speed is higher, the maximum welding speed can reach more than 1.8m/min, single-layer disposable welding is realized, the melting interval of slag in the stage of 1000-1300 ℃ is too short, the crystallization rate is higher, the cooling speed is too high, inclusions and gas cannot be effectively discharged from a welding seam in time, poor cleanliness of the welding seam is extremely easy to cause, the effective components cannot fully react, the free flow of welding seam deposited metal and the effective transition of beneficial alloy are not facilitated, and the structure of an excellent welding joint cannot be obtained; particularly, when the method is used for low-speed welding, welding deposited metal is limited, and poor transition and poor filling quality defects are easily caused, so that the quality and performance of the double-pipe girth weld with the grade of X70 steel or more are seriously influenced, particularly the fracture toughness performance of the weld cannot be ensured, and the safety of a pipeline is often adversely influenced.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the sintered flux for the double-pipe submerged arc circumferential welding and the preparation method thereof, which are suitable for the double-pipe submerged arc welding with the grade of X70 steel or more, can realize that welding slag has a larger melting interval and a lower crystallization rate within 1000-1300 ℃, ensures the purity of a welding seam in the welding process, fully reacts effective components, is beneficial to the free flow of welding seam deposited metal and the effective transition of beneficial alloy, and further obtains an excellent welding joint structure, and has higher toughness and excellent CTOD fracture toughness.
The technical scheme of the invention is as follows: sintered flux for submerged arc girth welding of duplex pipes, the sintered fluxThe chemical components in percentage by mass are: caF (CaF) 2 :5～15％、MgO:15～20％、Al 2 O 3 :15～20％、CaO:2～5％、MnO:3～10％、 BaCO 3 :5～10％、TiO 2 :3～10％、Ni:1～5％、B:0.8～1.5％、Re:1～0.05％、SiO 2 : 15-20 percent of iron powder: 10 to 30 percent, S is less than or equal to 0.015 percent, and P is less than or equal to 0.020 percent.
The CaF is 2 Adding in fluorite mineral powder form, caF 2 The content is not less than 95 percent, and P is less than or equal to 0.003 percent; mgO is added in the form of fused magnesia, the MgO content is not less than 97%, S is not more than 0.003% and P is not more than 0.05%; the Al is 2 O 3 Added in the form of bauxite, al 2 O 3 Not less than 84%, S, P not more than 0.03%; the CaO is added in the form of marble, and the CaO content is not less than 40%; the MnO is added in the form of manganese-rich ore after roasting, air-drying and water leaching treatment, the MnO content is not less than 30%, S is not more than 0.05% and P is not more than 0.05%; the BaCO 3 Adding barium carbonate in a form of not less than 70%; the SiO is 2 Is carried in by manganese ore, bauxite, fluorite, fused magnesia, rare earth ferrosilicon and binder water glass, siO 2 The total content is controlled below 20 percent, and S, P is less than or equal to 0.03 percent; the TiO 2 Added in the form of natural rutile, tiO 2 The content is above 58%; the Re and Si alloy is added in a rare earth ferrosilicon form, the Re content is more than 30%, and the Si content is more than 45%; the Ni alloy is added in the form of electrolytic ferronickel, and the Ni content is more than 90 percent, and P, S is less than or equal to 0.03 percent; the B iron alloy is added in the form of electrolytic ferronickel, the content of B is more than 20%, P is less than or equal to 0.03%, and S is less than or equal to 0.03%; the iron powder is an atomized reduced iron powder having an oxygen content of 0.5% or less, and an Fe content of 40% or more relative to the total amount of the iron powder.
The granularity of the fluorite mineral powder is more than 100 meshes; the granularity of the fused magnesia is 80-100 meshes; the granularity of the bauxite is 80-100 meshes; the SiO is 2 The granularity of (2) is 80-100 meshes; the granularity of the natural rutile is more than 100 meshes; the granularity of the rare earth ferrosilicon is 80-120 meshes; particle size of the ferronickel: 80-120 meshes; particle size of the ferronickel: 80-120 meshes; the atomized reductionThe granularity of the iron powder is below 200 meshes.
When the chemical components required by the sintered flux are added in the forms of fluorite, fused magnesia, bauxite, marble, barium carbonate, manganese ore, rutile, rare earth ferrosilicon, ferronickel, ferroboron and iron powder, the sintered flux comprises the following mineral components in percentage by weight: fluorite: 8-18 percent of fused magnesite: 18-22% of bauxite: 20-25% of marble: 5-10% of barium carbonate: 7-15 percent of manganese ore: 8-15% of rutile: 8-15 percent of rare earth ferrosilicon: 0.2-1%, nickel iron: 1 to 5 percent; ferroboron: 0.8 to 1.5 percent of iron powder: 10-30%.
The chemical components of the sintered flux for the double-pipe submerged arc girth welding are selected according to the following steps:
(1)CaF 2 as slag former, with SiO 2 H of liquid metal surface 2 The O reaction can generate HF gas which is insoluble in molten steel, can reduce the partial pressure of hydrogen in an electric arc and reduce the solubility of hydrogen in metal, but the HF gas has toxic action on human bodies; at the same time, caF 2 The liquid slag is diluted, the fluidity of the slag is improved, the viscosity of the slag is reduced, and the rapid solidification of the slag is facilitated, and the CaF is realized 2 Too high can seriously reduce the stability of the electric arc, affect the formability of the welding seam, increase the toxic action on operators, and not achieve the required effect when too low. According to the above, caF 2 The content of (2) is controlled to be 5-15%.
(2) MgO belongs to an alkaline material, plays a role in regulating the alkalinity of a welding agent together with CaO, has an obvious role in improving the melting point of slag and the temperature of a melting zone, can regulate the melting point and the existing time of weld metal, ensures effective precipitation of harmful substances, and controls the content of MgO to 15-20% according to the problems that the melting point of slag is raised, the fluidity of slag is poor, the formability of the weld is poor and the undercut and the deslagging difficulty are seriously caused when the content of MgO is too high in order to ensure the fluidity and the spreadability of the weld metal and the content of the harmful substances is not more than 20%.
(3)Al 2 O 3 As a main slag former, the magnesium alloy has good stability at high temperature, and has the melting point, viscosity and melting point of slag together with MgOThe temperature of the melting zone plays a good role in regulating, thereby improving and regulating the shape of the welding seam. When the content is certain, the scale pattern of the welding line is finer, the surface of the welding line is smoother, in the invention, when Al 2 O 3 If the content exceeds 25%, the melting point of the slag becomes too high and the viscosity increases, so that the fluidity of the slag is significantly reduced, and the appearance of the weld bead is seriously deteriorated. According to this, al is 2 O 3 The content of (2) is 15-20%.
(4) CaO is used as a main component of an alkaline slag system, has the characteristics of small linear expansion coefficient, low crystallization phase transition temperature and the like, can increase the surface tension of slag and the interfacial tension of slag and metal, improves the deslagging capability, and can greatly improve the technological performance of welding seams. The alkalinity of the slag can be improved, and the desulfurization and dephosphorization capabilities of the slag can be increased; if the content is too high, slag forms 3CaO.SiO 2 The composition, increasing the melting point of slag, adversely affects the fluidity of the weld metal, according to which Al 2 O 3 The content of (2) is controlled to be 2-5%.
(5)BaCO 3 Has the functions of stabilizing arc and slagging, and can replace part of SiO 2 The method has the effects of adjusting the melting point, viscosity, surface tension and fluidity of slag, improving the stability of an electric arc, reducing seam undercut and improving the formability of the seam; at the same time, a certain content of BaCO 3 However, when the content is too high, the catalyst tends to decompose and TiO 2 Combined to generate BaO.TiO 2 The slag detachability is deteriorated. According to this BaCO 3 The content of (2) is controlled to be 5-10%.
(6)TiO 2 Has arc stabilizing and slag forming effects. The melting point, viscosity, surface tension and fluidity of the slag can be adjusted, and the slag is particularly suitable for circumferential welding, improves the appearance of a welding bead and reduces undercut; meanwhile, in the Ti transition path welding seam, second phase particles such as carbide, nitride, intermetallic compound and the like are separated out in the process of welding seam crystallization and cooling, austenite grains can be thinned, thereby the ferrite grains after transformation are thinned, the welding seam is ensured to have better strength and toughness, the required effect can be achieved only when the strength and toughness of the welding seam are higher than the strength and toughness, the solidification temperature interval of slag can be reduced when the strength and toughness of the welding seam are higher than 10 percent, the fluidity of welding flux slag is unfavorable,thus, tiO 2 The content of (2) is determined to be 3-10%.
(7) MnO is added in the form of manganese ore in the project, so that the surface tension of slag can be reduced, the fluidity is improved, the weld joint formation is facilitated, and the bearing capacity of welding current is improved. However, the manganese ore contains more impurities such as S, P, and the content of P, S in the manganese ore is reduced to below 0.05% by adopting the manganese-rich ore, roasting at high temperature, air-drying and water leaching, so that the MnO content is controlled to be about 5-10%.
(8)SiO 2 The deoxidizer can be used for adjusting the alkalinity, viscosity, softening temperature and the like of slag to a certain extent, can be combined with most of alkaline oxides in the slag to form a compound, can increase the viscosity of the slag, ensures that the steel pipe does not flow slag in the high-speed rotation process, and ensures that the weld metal solution does not run off, so that the weld bead has good appearance. The raw materials of wollastonite, bauxite, fluorite and fused magnesia contain a large amount of SiO besides the main components 2 Therefore, siO is not directly added in the project 2 The preparation of other raw materials is carried out to control the raw materials to 15-20 percent;
(9) The rare earth is an alloy prepared by melting silicon, rare earth and the like, is a good spheroidizing agent, obviously improves the quantity and the form of sulfide inclusions distributed in a strip shape, has the function of obviously reducing the sulfur content in a welding line, improves the cleanliness of the welding line, ensures the integral quality stability and the structural uniformity of the welding line, and has extremely small single rare earth addition amount and extremely difficult preparation of welding flux, so the project adopts alloy components formed by melting silicon alloy and rare earth. The effect of rare earth on the weld joint is that the weld joint performance is improved by changing the structure morphology through the transition of the welding flux into the weld joint, the content is too small to play a role, the content is too large to pollute the crystal boundary and lose the expected effect, and the content of the silicon element is too large to easily increase the viscosity of the slag, so the content of the rare earth is determined to be 0.05-1%.
(10) The Ni and B alloys have higher transition coefficient and stronger activity, the project has the effect of reducing the oxygen activity of slag in the welding process by adding nickel iron, manganese iron and rare earth ferrosilicon, can compensate Ni and B burnt in weld metal in the welding process, simultaneously protect beneficial alloy elements in the weld from being burnt, effectively play the roles of forming and stabilizing austenite, and achieve the effects of increasing the supercooling degree of austenite to ferrite transformation, improving nucleation rate, reducing grain growth time and playing a good role of grain refinement; meanwhile, the inclusion in a welding pool can be effectively controlled, the method plays a vital role in obtaining a high-toughness welding joint at a low temperature, and the weld joint is fine and uniform in weld joint structure and ensures that the weld joint obtains excellent low-temperature fracture toughness. Therefore, the content of the Ni alloy to be added is determined to be about 1 to 5%, and the content of the B to be added is determined to be 0.8 to 1.5%.
(11) The iron powder is used as an necessary additive component in high-speed welding to increase the welding wire deposition rate and high-efficiency submerged arc welding, and the added iron powder can play a role in improving and enhancing the welding process performance, such as arc stability and deslagging performance, and enables the weld joint to be formed smoothly and attractive. When the iron powder content is less than 10%, the effect of improving the welding efficiency is not obtained, and when the iron powder content exceeds 30%, the iron powder tends to aggregate in the flux during melting and solidification, and excessive iron powder tends to adhere to the surface of the weld bead, thereby reducing the spreadability of the weld bead. For the low-hydrogen flux, the excessive oxygen content in the iron powder can dilute welding slag, influence the protection effect of the flux and are unfavorable for transition of alloy elements, and the oxygen content in the iron powder is strictly limited to be less than 0.5%, so that the content of the iron powder is determined to be 10-30%.
The preparation method of the sintered flux for the double-pipe submerged arc girth welding comprises the following steps of:
s1: according to the weight portions, 8 to 18 portions of fluorite, 18 to 22 portions of fused magnesia, 20 to 25 portions of bauxite, 5 to 10 portions of marble, 7 to 15 portions of barium carbonate, 8 to 15 portions of manganese ore, 8 to 15 portions of rutile, 0.2 to 1 portion of rare earth ferrosilicon, 1 to 5 portions of ferronickel, 0.8 to 1.5 portions of ferroboron and 10 to 30 portions of iron powder are evenly mixed;
s2: adding 15.48-31.5 parts of binder into the mixture obtained in the step S1, and vibrating and shaking the bonded wet material by a dustpan or a granulator to granulate;
s3: in the granulating process, the granularity of the flux formed by granulating is controlled between 10 and 60 meshes through a sieve with 10 to 20 meshes;
s4: drying the formed flux in a temperature range of 200-350 ℃ by a high-temperature furnace;
s5: sintering the dried flux in a sintering furnace at 800-900 ℃;
s6: and (5) screening the sintered flux through 10-60 meshes, and packaging.
The adhesive in the step S2 is sodium water glass, the Baume degree of the sodium water glass serving as the adhesive is 41.9-43.9, and the modulus is 2.5-2.7.
In the actual preparation process, the Baume degree of the sodium silicate serving as a binder is 41.9-43.9, the modulus is 2.5-2.7, the moisture content and the hydrogen content in the flux can be effectively reduced, the alkalinity of the flux is improved, and the granularity of the flux is ensured to have good strength.
In the step S5, inert gas with the flow rate of 0.1-1 liter/min is introduced to protect the welding flux during sintering.
In the actual preparation process, inert gas is adopted to protect the flux, so that oxidation of the flux under the high-temperature condition can be effectively prevented.
The invention has the beneficial effects that:
1. the invention introduces TiO into the chemical components of the sintered flux 2 BaCO 3 The slag is ensured to have a larger melting interval and a lower crystallization rate within 1000-1300 ℃, and the purity of the welding line and the technological performance of the welding line in the welding process are ensured.
2. Compared with the common flux, the flux has higher alkalinity value, reduces the oxidizing capacity of slag, reduces harmful gas and impurities in slag, and ensures more effective transition of beneficial alloy.
3. According to the invention, the iron powder is introduced into the chemical components of the sintered flux, so that the metal deposition rate in the small heat input welding process can be further improved, the weld metal filling quantity is ensured, and the welding pass is synchronously reduced, thereby achieving the purpose of improving the welding efficiency.
4. According to the invention, B, ni alloy and rare earth microalloy substances are introduced into the chemical components of the sintered flux, so that the weld joint crystal grains are refined and uniformly treated, and meanwhile, more acicular ferrite structures are ensured, thereby ensuring that the weld joint has excellent CTOD fracture toughness on the basis of higher toughness.
5. The welding flux and the corresponding welding wire are adopted to carry out circumferential submerged arc welding on the steel pipe, the linear energy is more than 15KJ/cm, the welding slag is not lost, the welding bead is regular, the welding bead surface is smooth, the metallic luster is obvious, and the slag is easy to fall off.
6. After the welding flux is matched with the corresponding welding wire for welding, the girth weld metal R m After the welding of the steel pipe with the thickness of being 695-750MPa and the thickness of being X80 phi 1422 multiplied by 21.4mm, the invention can be suitable for a wider welding process parameter range, and the welding seam slag is not lost, slag is easy to remove, and the welding bead is flat and regular in the submerged arc welding process of the submerged arc steel pipe with the thickness of being X80 with the thickness of being more than 20 mm.
7. After the welding flux and the corresponding welding wires are adopted to carry out circumferential welding on two X80 steel grade steel pipes, after nondestructive testing is carried out according to the welding standard of a natural gas conveying pipeline, the welding seam has no cracks, out-of-standard pores and slag inclusion, meets the standard requirements, and meanwhile, the welding seam has excellent fracture toughness.
Detailed Description
The invention is described in further detail below with reference to examples:
example 1
The sintered flux for the double-pipe submerged arc girth welding comprises the following chemical components in percentage by mass: caF (CaF) 2 :5～15％、MgO:15～20％、Al 2 O 3 :15～20％、CaO:2～5％、MnO:3～10％、BaCO 3 :5～10％、 TiO 2 :3～10％、Ni:1～5％、B:0.8～1.5％、Re:1～0.05％、SiO 2 : 15-20 percent of iron powder: 10 to 30 percent, S is less than or equal to 0.015 percent, and P is less than or equal to 0.020 percent.
The CaF is 2 Adding in fluorite mineral powder form, caF 2 The content is not less than 95 percent, and P is less than or equal to 0.003 percent; mgO is added in the form of fused magnesia, the MgO content is not less than 97%, S is not more than 0.003% and P is not more than 0.05%; the Al is 2 O 3 Added in the form of bauxite, al 2 O 3 Not less than 84%, S, P not more than 0.03%; the CaO is added in the form of marble, and the CaO content is not less than 40%; the MnO is added in the form of manganese-rich ore after roasting, air-drying and water leaching treatment, the MnO content is not less than 30%, S is not more than 0.05% and P is not more than 0.05%; the BaCO 3 Adding barium carbonate in a form of not less than 70%; the SiO is 2 Is carried in by manganese ore, bauxite, fluorite, fused magnesia, rare earth ferrosilicon and binder water glass, is not specially added, is SiO 2 The total content is controlled below 20 percent, and S, P is less than or equal to 0.03 percent; the TiO 2 Added in the form of natural rutile, tiO 2 The content is above 58%; the Re and Si alloy is added in a rare earth ferrosilicon form, the Re content is more than 30%, and the Si content is more than 45%; the Ni alloy is added in the form of electrolytic ferronickel, and the Ni content is more than 90 percent, and P, S is less than or equal to 0.03 percent; the B iron alloy is added in the form of electrolytic ferronickel, the content of B is more than 20%, P is less than or equal to 0.03%, and S is less than or equal to 0.03%; the iron powder is an atomized reduced iron powder having an oxygen content of 0.5% or less, and an Fe content of 40% or more relative to the total amount of the iron powder.
The granularity of the fluorite mineral powder is more than 100 meshes; the granularity of the fused magnesia is 80-100 meshes; the granularity of the bauxite is 80-100 meshes; the SiO is 2 The granularity of (2) is 80-100 meshes; the granularity of the natural rutile is more than 100 meshes; the granularity of the rare earth ferrosilicon is 80-120 meshes; particle size of the ferronickel: 80-120 meshes; particle size of the ferronickel: 80-120 meshes; the particle size of the atomized reduced iron powder is below 200 meshes.
When the chemical components required by the sintered flux are added in the forms of fluorite, fused magnesia, bauxite, marble, barium carbonate, manganese ore, rutile, rare earth ferrosilicon, ferronickel, ferroboron and iron powder, the sintered flux comprises the following mineral components in percentage by weight: fluorite: 8-18 percent of fused magnesite: 18-22% of bauxite: 20-25% of marble: 5-10% of barium carbonate: 7-15 percent of manganese ore: 8-15% of rutile: 8-15 percent of rare earth ferrosilicon: 0.2-1%, nickel iron: 1 to 5 percent; ferroboron: 0.8 to 1.5 percent of iron powder: 10-30%.
Example 2
A preparation method of sintered flux for submerged arc girth welding of duplex pipes comprises the following steps:
s1: according to the weight portions, 8 to 18 portions of fluorite, 18 to 22 portions of fused magnesia, 20 to 25 portions of bauxite, 5 to 10 portions of marble, 7 to 15 portions of barium carbonate, 8 to 15 portions of manganese ore, 8 to 15 portions of rutile, 0.2 to 1 portion of rare earth ferrosilicon, 1 to 5 portions of ferronickel, 0.8 to 1.5 portions of ferroboron and 10 to 30 portions of iron powder are evenly mixed;
s2: adding 15.48-31.5 parts of binder into the mixture obtained in the step S1, and vibrating and shaking the bonded wet material by a dustpan or a granulator to granulate;
s3: in the granulating process, the granularity of the flux formed by granulating is controlled between 10 and 60 meshes through a sieve with 10 to 20 meshes;
s4: drying the formed flux in a temperature range of 200-350 ℃ by a high-temperature furnace;
s5: sintering the dried flux in a sintering furnace at 800-900 ℃;
s6: and (5) screening the sintered flux through 10-60 meshes, and packaging.
The adhesive in the step S2 is sodium water glass, the Baume degree of the sodium water glass serving as the adhesive is 41.9-43.9, and the modulus is 2.5-2.7.
In the step S5, inert gas with the flow rate of 0.1-1 liter/min is introduced to protect the welding flux during sintering.
Example 3
The sintered flux for double pipe submerged arc circumferential welding according to the above-described embodiment 1 was prepared by using the method for preparing sintered flux for double pipe submerged arc circumferential welding according to embodiment 2. The specific process is as follows:
(1) Flux component (wt%)
When the chemical components required by the sintered flux are added in the forms of fluorite, fused magnesia, bauxite, marble, barium carbonate, manganese ore, rutile, rare earth ferrosilicon, ferronickel, ferroboron and iron powder, the sintered flux comprises the following mineral components in percentage by weight: fluorite 10, fused magnesia 18.5, bauxite 21.5, marble 6, barium carbonate 8.5, manganese ore 12, rutile 6, rare earth ferrosilicon 0.2, ferronickel 3, ferroboron 1 and iron powder 12.
(2) Sintered flux preparation
Mixing the mineral components and the alloy, uniformly stirring, adding adhesive potassium sodium water glass for wet mixing, granulating by a dustpan or a granulator, controlling the granularity of the welding flux between 10 and 60 meshes, drying at a low temperature of 200 to 250 ℃, sintering at a high temperature of 800 to 900 ℃, screening by 10 to 60 meshes, and packaging by using a packaging bag with moisture resistance.
(3) The welding flux is matched with a corresponding low-temperature welding wire to weld deposited metal, and according to the related welding material standard requirement, the test plate adopts Q235, the thickness is 25mm, the bevel angle is 20 degrees, and the root gap is 15mm. The welding specification is current 480A, voltage 30V, welding speed 26m/h, inter-channel temperature 150+ -15 ℃, and the mechanical properties of deposited metal after welding are shown in Table 1.
TABLE 1 mechanical Properties of deposited metal
As can be seen from Table 1, the welding flux provided by the invention is matched with a corresponding low-temperature welding wire to weld deposited metal, and compared with standard requirements, the welding seam has high toughness and excellent CTOD fracture toughness.
(4) The welding flux is matched with the corresponding low-temperature welding wire to carry out the annular position welding of two steel pipes, the steel pipe is of steel grade X80, the specification phi 1422 multiplied by 21.4mm, and the chemical composition C is as follows: 0.05, si:0.25, mn:1.68, P:0.011, S:0.0016, cu:0.17, ni:0.37, cr:0.22, mo:0.22, ti:0.018, V:0.05, al:0.03, b:0.0004, the balance being iron. The adopted process is as follows: the angle of the circular position groove is the innerThe surface is 60 degrees, the inner surface is 80 degrees, the root gap is 2mm, and the blunt edge is 6-8 mm; the welding sequence is that firstly, an internal butt joint device is adopted to group two steel pipes, and CO is adopted 2 And (3) performing gas shielded automatic welding for pre-welding, and then sequentially completing internal and external welding of the steel pipes by submerged arc welding. The submerged arc welding process adopts a combined process of inner welding monofilaments, outer welding monofilaments for bottoming and filling the cover surface, and the inner welding current is 850A and the voltage is 30V; outer weld priming specification: priming welding current 680A, voltage 31.5V, welding speed 0.7m/min; the cap surface is filled with 700A of wire current before welding, the voltage is 30V, the welding speed is 1m/min, the inter-channel temperature is 150+/-15 ℃, and the mechanical properties of the welded metal are shown in Table 2.
TABLE 2 circumferential weld metal mechanical Properties
As can be seen from Table 2, the welding flux provided by the invention is matched with the corresponding low-temperature welding wire to carry out circumferential welding of two steel pipes, the welding seam has higher toughness, slag of the welding seam is not lost in the welding process, the welding bead is regular, the surface of the welding seam is smooth, the metallic luster is obvious, the slag is easy to fall off, the tensile strength of metal of the circumferential welding seam is far higher than the standard value, after the welding flux provided by the invention is adopted to carry out circumferential welding on the two X80 steel pipes with the corresponding welding wire, after nondestructive detection is carried out according to the welding standard of a natural gas conveying pipeline, no crack and exceeding air holes are formed in the welding seam, slag inclusion meets the standard requirement, and meanwhile, the welding seam has excellent fracture toughness.
The sintered flux for twin-tube submerged arc circumferential welding according to the above-described embodiment 1 was prepared by using the method for preparing sintered flux for twin-tube submerged arc circumferential welding according to embodiment 2, and the same procedure as in embodiment 3 was used, specifically, comparative examples were comparative examples 1, 2, 3, and 4, as described in embodiment 4, embodiment 5, embodiment 6, and embodiment 7.
The chemical element compositions of the sintered fluxes in examples 4 to 7 and comparative examples 1 to 4 are shown in table 3 in weight percent.
TABLE 3 chemical element components of sintered fluxes of examples 4 to 7 and comparative examples 1 to 4 in weight percent (wt%)
| Sequence number | CaF 2 | MgO | Al 2 O 3 | CaO | MnO | BaCO 3 | TiO 2 | Ni | B | Re | Fe | P | S |
| Example 4 | 15 | 16 | 18 | 4 | 9 | 5 | 10 | 1 | 1.3 | 1 | 10 | 0.01 | 0.01 |
| Example 5 | 13 | 18 | 19 | 5 | 5 | 9 | 7 | 3 | 0.9 | 0.08 | 15 | 0.009 | 0.018 |
| Example 6 | 14 | 20 | 18 | 4 | 8 | 9 | 6 | 4 | 0.8 | 0.08 | 12 | 0.017 | 0.018 |
| Example 7 | 12 | 15 | 19 | 3 | 6 | 10 | 3 | 5 | 0.8 | 0.05 | 30 | 0.015 | 0.018 |
| Comparative example 1 | 13 | 20 | 19 | 3 | 5 | -- | 11 | 5 | -- | 0.09 | 15 | 0.01 | 0.013 |
| Comparative example 2 | 15 | 18 | 20 | 5 | 7 | 7 | 2 | -- | 1.0 | -- | -- | 0.08 | 0.01 |
| Comparative example 3 | 13 | 17 | 16 | 5 | 10 | 11 | 5 | 3 | 1.5 | 1.2 | 31 | 0.12 | 0.05 |
| Comparative example 4 | 15 | 20 | 16 | 3 | 5 | 7 | 5 | 6 | 0.9 | 0.02 | 9 | 0.05 | 0.015 |
The preparation parameters of the sintered fluxes in examples 4 to 7 and comparative examples 1 to 4 are shown in Table 4.
TABLE 4 preparation parameters of sintered fluxes in examples 4 to 7 and comparative examples 1 to 4
The mechanical properties of the sintered fluxes of examples 4 to 7 and comparative examples 1 to 4 are shown in Table 5.
Table 5 test conditions of sintered fluxes of examples 4 to 7 and comparative examples 1 to 4 and mechanical and process performance results of girth weld
In combination with tables 3 and 4, the weight percentage (wt%) of certain components in the bushings of comparative examples 1 to 4 are outside the range of the technical solution of the present invention, for example: in comparative example 1, tiO therein 2 Is higher than the weight percentage of TiO in the flux of the invention 2 In comparative example 3, wherein BaCO is present in the weight percent 3 The weight percentage of Fe powder and Re is higher than that of TiO in the flux 2 Weight percentages of Fe and Re; some of the preparation process parameters of the sintered fluxes in comparative examples 1 to 4 are outside the ranges to which the technical solutions of the present invention relate, for example, the drying temperature of the flux in comparative example 1 is lower than the drying temperature of the technical solutions of the present invention; from Table 5, it can be seen that at least one of the performance metrics of the fluxes of comparative examples 1 to 4 is lower than the standard design requirements, such as: CTOD performance in comparative example 1 did not meet the standard requirement, andthe post-weld process performance failed to meet the standard requirements, and neither the impact toughness value nor CTOD in comparative example 2, therefore, the fluxes of comparative examples 1-4 were not suitable for the submerged arc duplex tube application requirements.
As can be seen from Table 5, compared with comparative examples 1 to 4, the tensile strength of the welded joint welded by the submerged arc sintered flux in examples 4 to 7 is 695 to 715MPa, the moisture content in the flux is less than 0.1%, the mechanical inclusion in the flux is less than 0.3%, the impact energy of the girth weld at-10 ℃ is more than or equal to 150J, the toughness transformation temperature is below-40 ℃, and the CTOD fracture toughness sigma m at-10 ℃ is more than or equal to 0.254mm. Meanwhile, after welding, a plurality of welding fluxes can realize automatic falling of a slag shell, and the smoothness and the attractiveness of the surface of a welding bead are ensured, so that the welding fluxes in the embodiments 4-7 are adopted for double-pipe girth welding, and have higher strength, high toughness and excellent fracture resistance, and particularly the appearance of the welding bead after girth welding is obviously improved compared with that of a common welding flux, and each performance is greatly superior to that of the current like product.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. A sintered flux for submerged arc girth welding of duplex pipes, characterized in that: the sintered flux comprises the following chemical components in percentage by mass: caF (CaF) 2 :5~15%、MgO:15~20%、Al 2 O 3 :15~20%、CaO:2~5%、MnO:3~10%、BaCO 3 :5~10%、TiO 2 :3~10%、Ni:1~5%、B:0.8~1.5%、Re:1~0.05%、SiO 2 : 15-20% of iron powder: 10-30%, S is less than or equal to 0.015%, and P is less than or equal to 0.020%.
2. A sintered flux for submerged arc girth welding of duplex pipes as claimed in claim 1, wherein: the CaF is 2 Adding in fluorite mineral powder form, caF 2 The content is not less than 95 percent, and P is less than or equal to 0.003 percent; the MgO is fused by electricityThe magnesia is added in a form that the MgO content is not less than 97%, S is not more than 0.003% and P is not more than 0.05%; the Al is 2 O 3 Added in the form of bauxite, al 2 O 3 Not less than 84%, S, P not more than 0.03%; the CaO is added in the form of marble, and the CaO content is not less than 40%; the MnO is added in the form of manganese-rich ore after roasting, air-drying and water leaching treatment, the MnO content is not less than 30%, S is not more than 0.05% and P is not more than 0.05%; the BaCO 3 Adding barium carbonate in a form of not less than 70%; the SiO is 2 Is carried in by manganese ore, bauxite, fluorite, fused magnesia, rare earth ferrosilicon and binder water glass, siO 2 The total content is controlled below 20 percent, and S, P is less than or equal to 0.03 percent; the TiO 2 Added in the form of natural rutile, tiO 2 The content is above 58%; the Re and Si alloy is added in a rare earth ferrosilicon form, the Re content is more than 30%, and the Si content is more than 45%; the Ni alloy is added in the form of electrolytic ferronickel, and the Ni content is more than 90 percent, and P, S is less than or equal to 0.03 percent; the B iron alloy is added in the form of electrolytic ferronickel, the content of B is more than 20%, P is less than or equal to 0.03%, and S is less than or equal to 0.03%; the iron powder is an atomized reduced iron powder having an oxygen content of 0.5% or less, and an Fe content of 40% or more relative to the total amount of the iron powder.
3. A sintered flux for submerged arc girth welding of duplex pipes as claimed in claim 2, wherein: the granularity of the fluorite mineral powder is more than 100 meshes; the granularity of the fused magnesia is 80-100 meshes; the granularity of the bauxite is 80-100 meshes; the SiO is 2 The granularity of (3) is 80-100 meshes; the granularity of the natural rutile is more than 100 meshes; the granularity of the rare earth ferrosilicon is 80-120 meshes; particle size of the ferronickel: 80-120 meshes; particle size of the ferronickel: 80-120 meshes; the particle size of the atomized reduced iron powder is below 200 meshes.
4. A sintered flux for submerged arc girth welding of duplex pipes as claimed in claim 2, wherein: when the chemical components required by the sintered flux are added in the forms of fluorite, fused magnesia, bauxite, marble, barium carbonate, manganese ore, rutile, rare earth ferrosilicon, ferronickel, ferroboron and iron powder, the sintered flux comprises the following mineral components in percentage by weight: fluorite: 8-18 percent of fused magnesite: 18-22% of bauxite: 20-25% of marble: 5-10% of barium carbonate: 7-15% of manganese ore: 8-15% of rutile: 8-15% of rare earth ferrosilicon: 0.2-1%, nickel iron: 1-5%; ferroboron: 0.8-1.5%, iron powder: 10-30%.
5. A method of preparing sintered flux for submerged arc girth welding of duplex pipes as claimed in claim 1, wherein: the method comprises the following steps:
s1: according to the weight parts, 8-18 parts of fluorite, 18-22 parts of fused magnesia, 20-25 parts of bauxite, 5-10 parts of marble, 7-15 parts of barium carbonate, 8-15 parts of manganese ore, 8-15 parts of rutile, 0.2-1 part of rare earth ferrosilicon, 1-5 parts of ferronickel, 0.8-1.5 parts of ferroboron and 10-30 parts of iron powder are uniformly mixed;
s2: adding 15.48-31.5 parts of binder into the mixture obtained in the step S1, and vibrating and shaking the bonded wet material by a dustpan or a granulator to granulate;
s3: in the granulating process, controlling the granularity of the granulated and formed welding flux to be between 10 and 60 meshes through a sieve with 10 to 20 meshes;
s4: drying the formed welding flux in a temperature range of 200-350 ℃ by a high-temperature furnace;
s5: sintering the dried flux in a sintering furnace at 800-900 ℃;
s6: and screening the sintered flux for 10-60 meshes and packaging.
6. The method for preparing sintered flux for submerged arc circumferential welding of duplex pipes according to claim 5, wherein: the adhesive in the step S2 is sodium water glass, the Baume degree of the sodium water glass serving as the adhesive is 41.9-43.9, and the modulus is 2.5-2.7.
7. The method for preparing sintered flux for submerged arc circumferential welding of duplex pipes according to claim 5, wherein: in the step S5, inert gas with the flow rate of 0.1-1 liter/min is introduced during sintering to protect the welding flux.
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