CN112975211A - Low-yield-ratio high-toughness submerged-arc welding material for Q690-grade weather-resistant bridge - Google Patents
Low-yield-ratio high-toughness submerged-arc welding material for Q690-grade weather-resistant bridge Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 70
- 239000000463 material Substances 0.000 title claims abstract description 30
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 8
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 8
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 7
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 239000000853 adhesive Substances 0.000 claims abstract 3
- 230000001070 adhesive effect Effects 0.000 claims abstract 3
- 230000004907 flux Effects 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- 229910052681 coesite Inorganic materials 0.000 claims description 10
- 229910052906 cristobalite Inorganic materials 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 229910052682 stishovite Inorganic materials 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 229910052905 tridymite Inorganic materials 0.000 claims description 10
- 229910052882 wollastonite Inorganic materials 0.000 claims description 9
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 8
- 239000010456 wollastonite Substances 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- 239000010436 fluorite Substances 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000010433 feldspar Substances 0.000 claims description 5
- 229910052700 potassium Inorganic materials 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 18
- 239000010959 steel Substances 0.000 abstract description 18
- 239000002893 slag Substances 0.000 description 16
- 230000008569 process Effects 0.000 description 12
- 238000011161 development Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910004014 SiF4 Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 229910000870 Weathering steel Inorganic materials 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- 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
- B23K35/3601—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 with inorganic compounds as principal constituents
-
- 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
-
- 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
- B23K9/18—Submerged-arc welding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention provides a low-yield-ratio high-toughness submerged-arc welding material for a Q690-grade weather-proof bridge, which comprises the following components in percentage by mass: 5-10 percent of aluminum oxide, 15-20 percent of ferrosilicon, 0.5-2 percent of ferrosilicon and 0.5-2 percent of ferromanganese; the adhesive is water glass, and the mass of the adhesive is 20-30% of the total mass of the medicinal powder. The invention can be used for welding Q690-grade weather-proof steel bridge structures, and can meet the requirements of long service life, large parameter and high performance of weather-proof steel structures such as engineering machinery, pressure vessels, building bridges and the like.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a low-yield-ratio high-toughness submerged-arc welding material for a Q690-grade weather-resistant bridge.
Background
With the continuous development of the lightweight design technology of bridges, the strength level of bridge steel is improved, and the requirements on performance after the thickness of the material is reduced are more rigorous. In china, with the rapid development of the economy of china, the country has increased the investment in the transportation industry, and the total mileage of highway bridges and railway bridges across rivers, gulfs across sea increases day by day, such as large-span large bridges across sea in the east sea, the hangzhou gulf and the Qingdao gulf, thereby promoting the development of high-strength and high-toughness bridge steel. Q690 series high-strength steel is generally produced by quenching and tempering, and has higher yield ratio.
With the development of bridge design and large-span steel bridge construction, high-performance bridge steel has gained a long-standing development in recent years. For the welding of bridge steel, if a Q690 strength grade material is adopted, the strength, toughness and welding difficulty of the bridge steel are greatly improved, and the safety and reliability of a welding structure are also a great difficulty. Particularly, the design and construction of the bridge are always puzzled by the technical problems of insufficient toughness of weld metal, high yield ratio (up to more than 0.90) and the like, and the application of 800MPa grade high-strength weathering steel in bridge engineering is still in the engineering demonstration stage at present. The development of high-toughness arc welding materials with low yield ratio is urgently needed to meet the construction requirements of weather-resistant bridge engineering.
From the viewpoint of safety of the material of the welded joint, not only is higher strength required, but also a lower yield ratio is desired. The yield ratio of the weld metal is continuously increased along with the increase of the strength, when the yield strength is more than 690MPa, the yield ratio is as high as 0.90-0.95, the high yield ratio is unfavorable for the safety and reliability of a bridge structure, and the design and application of the steel for Q690-grade bridge engineering are severely restricted.
In recent years, various grades of 800 MPa-grade high-strength steels such as WCF-80, WSD690E, SG780CF, ADB790E, B780CF and the like are developed by various domestic large steel plants, but submerged arc welding materials corresponding to the high-strength steels mainly depend on imports such as NSSW NB-250H submerged arc welding flux and NSSW Y-80M welding wire, Germany BB24 submerged arc welding flux and EM4 welding wire, and the high-strength steels are expensive and have long purchase cycles. At present, few research results on low yield ratio, high strength and high toughness welding materials of domestic welding material enterprises and scientific research institutes are reported, and the welding materials have certain difference from imported welding materials in welding process, so that the development of domestic low yield ratio and high toughness submerged arc welding materials for weather-proof bridges is urgently needed.
Disclosure of Invention
In view of the above, the present invention aims to provide a low yield ratio high toughness submerged arc welding material for a Q690-grade weather-resistant bridge, so as to overcome the defects of the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a low yield ratio and high toughness submerged arc welding material for Q690-grade weather-resistant bridges comprises, by mass, 21-26% of fluorite, 30-35% of magnesite, 10-17% of wollastonite, and feldspar: 5-10 percent of aluminum oxide, 15-20 percent of ferrosilicon, 0.5-2 percent of ferrosilicon and 0.5-2 percent of ferromanganese; preferably, the binder is water glass, and the mass of the binder is 20-30% of the total mass of the medicinal powder.
Preferably, the amount of the organic solvent is, in mass percent,
fluorite: CaF2≥96％，SiO2≤3％，S≤0.01％，P≤0.01％；
Magnesia: mg is more than or equal to 90 percent and SiO2≤4.8％，CaO≤2％，S≤0.03％，P≤0.03％；
Wollastonite: CaO is more than or equal to 40 percent, Si is more than or equal to 45 percent, and SiO2 45-55％，S≤0.03％，P≤0.03％；
Feldspar SiO2 60％，Al2O3≤20％，K2O+Na2O≥12％，S≤0.015％，P≤0.015％；
Aluminum oxide of Al2O3≥98％，SiO2≤0.1％，Fe2O3≤0.05％，Na2O≤0.6％；
Silicon iron: si 40-47%, S less than or equal to 0.02%, P less than or equal to 0.03%;
ferromanganese: c is less than or equal to 1 percent, Mn is more than or equal to 78 percent, Si is less than or equal to 2 percent, S is less than or equal to 0.015 percent, and P is less than or equal to 0.015 percent.
Preferably, the flux is prepared by a process comprising the steps of,
the method comprises the following steps: putting the components of the flux into a mixer according to requirements, stirring and mixing uniformly, adding 20-30% of water glass as a binder, mixing and granulating;
step two: and (3) baking the semi-finished flux at low temperature: 300 ℃ and 400 ℃, and the time is 1 h; and then baking at high temperature: 700 ℃ and 800 ℃ for 1h, and after baking, screening is carried out, wherein the granularity is 12-60 meshes.
Preferably, the binder is high-modulus potassium-sodium water glass, the modulus is 3.0-3.1, the concentration is 35-40B' e, and the mass ratio of potassium to sodium is 1: 1.
preferably, low-temperature baking: the temperature is 350 ℃, and the time is 1 h; and (3) high-temperature baking: 720 ℃; the time is 1 h.
Preferably, the welding wire comprises, by weight, 0.078% of C, 1.73% of Mn, 0.34% of Si, 0.003% of S, 0.007% of P, 0.43% of Cr, 1.68% of Ni, 0.46% of Mo, 0.38% of Cu, and the balance of Fe, wherein the sum of the mass percentages of the components is 100%.
Preferably, the overall properties of the deposited metal are as follows: the yield strength Rp0.2 is more than or equal to 690 MPa; the tensile strength Rm is more than or equal to 810 MPa; yield ratio Rm/RP0.2 is 0.78-0.85; the elongation A is more than or equal to 14 percent; the impact energy Akv is more than or equal to 100J at the temperature of minus 40 ℃; the weather resistance index I is more than or equal to 6.5.
The invention also provides a welding method by using the low-yield-ratio high-toughness submerged arc welding material for the Q690-grade weather-proof bridge, wherein the current is 520-580A, the voltage is 28-31V, the speed is 24-30m/h, and the inter-road temperature is 150-180 ℃.
Role of the main components in the flux:
fluorite, CaF as main component2The calcium fluoride is an alkaline oxide, has a melting point of 1402 ℃, can effectively improve the fluidity of the slag, reduce the viscosity of the slag and improve the impact toughness, and has a desulfurization effect. In submerged arc welding processes, CaF2The decomposition occurs in a welding pool, the F element is combined with the H to form HF which is volatilized, the tendency of hydrogen white spots is reduced, and the welding line plasticity is enhanced. CaF2The following reactions occur in the weld pool:
CaF2+H2O＝CaO+2HF↑
CaF2+2H＝Ca+2HF↑
2CaF2+3SiO2＝CaSiO3+SiF4↑
SiF4+H＝SiF+3HF↑
CaF2easy ionizationThis can be detrimental to arc stability, and can significantly affect arc stability when the fluorite content of the submerged arc flux is too high.
The magnesia, the main component of which is MgO, is a good slagging material, can increase the air permeability of slag, belongs to alkaline oxides, and can improve the alkalinity of the slag, thereby improving the impact toughness of welding seams and simultaneously reducing the content of diffusible hydrogen. Magnesium oxide can become more stable cubic crystals after being heated at high temperature in the welding process, the melting point of magnesium oxide is higher, the viscosity of slag is improved, the fluidity of the slag is not facilitated, the slag can be difficult to remove in the welding process, and the forming is poor.
Alumina, an amphoteric oxide, is a major component of the flux. The flux is an important vitreous slag-forming material, is a regulator of slag viscosity, can adjust the fluidity of slag and has the function of increasing the surface tension of the slag.
The wollastonite mainly has the function of slagging, and because the wollastonite contains CaO, the basic oxides in welding slag are increased, the welding process performance is improved, and the toughness of weld metal is improved, but because the wollastonite contains SiO2The amount of addition is somewhat limited. Wollastonite has needle-like and fibrous crystal morphology, and can increase the strength of flux particles and reduce the degree of particle pulverization.
Feldspar is aluminosilicate containing K, Na, Ca, Mg, etc., contains K and Na, and is added into flux with K2O and Na2The O form exists and is a good arc stabilizer. K. The Na oxide has a very low melting point, and can dilute slag and lower the melting temperature of the flux. When the addition amount is excessive, the welding speed is slowed down, and the viscosity of the slag is increased.
The ferrosilicon can deoxidize in the welding process, improve the fluidity of slag, reduce the sensitivity of weld pores, make the welding wave fine, and generate SiO when the addition amount is excessive2The acidity and viscosity of the slag are increased, which promotes the formation of non-metallic inclusions, which are detrimental to the weld and mechanical properties.
The ferromanganese is deoxidized and desulfurized in the welding process, releases heat and accelerates the welding reaction speed, when the using amount is excessive, splashing is easy to generate in the welding process, and pores are easy to generate on the surface of a welding line.
When the ferrosilicon and ferromanganese are jointly deoxidized in a proper proportion, the deoxidized product can form silicate MnO2The molten steel has low density and low melting point, is in liquid state, is easy to polymerize into mass points with large radius, floats on molten slag, reduces inclusions in a welding seam, and reduces oxygen content in the welding seam.
Compared with the prior art, the low-yield-ratio high-toughness submerged arc welding material for the Q690-grade weather-proof bridge has the following advantages:
(1) the welding flux JQ.SJ80NH is a high-alkalinity low-hydrogen type welding flux, deposited metal obtained when the special welding wire is matched for welding is a Cr-Ni-Cu-Mo alloy system, the deposited metal is a mixed structure of acicular ferrite and lower bainite, and the welding seam structure can be ensured to have a lower yield ratio on the premise of ensuring weather resistance, high strength and high toughness. The yield ratio Rel/Rm is 0.78-0.85;
(2) the deposited metal welded by the invention not only has high strength and high toughness, but also has good weather resistance: the yield strength Rel is more than or equal to 690 MPa; the tensile strength Rm is more than or equal to 810 MPa; the elongation A is more than or equal to 14 percent; the impact energy Akv is more than or equal to 100J at the temperature of minus 40 ℃; the weather resistance index I is more than or equal to 6.5. The welding flux can be used for welding Q690-grade weather-resistant steel bridge structures, and can meet the requirements of long service life, large parameters and high performance of weather-resistant steel structures such as engineering machinery, pressure vessels, building bridges and the like.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
1. Submerged arc flux jq.sj80nh: after the powder is prepared according to the submerged arc welding agent formula in the table 1, the mixture is placed in a stirrer to be stirred uniformly, and the mixture is added with the components with the modulus of 3.0-3.1, the concentration of 35-40B' e and the ratio of potassium to sodium of 1: 1, a potassium-sodium water glass bonding granulation and low-temperature baking process: 350 ℃ for 1h, and a high-temperature baking process: 720 ℃ for 1h, and the granularity of the welding flux is 12-60 meshes.
TABLE 13 example submerged arc flux formulations
2. The submerged arc welding flux JQ.SJ80NH prepared in each example in the table 1 is matched with the same special welding wire, and the welding wire comprises the following components (in percentage by mass): 0.078% of C, 1.73% of Mn, 0.34% of Si, 0.003% of S, 0.007% of P, 0.43% of Cr, 1.68% of Ni, 0.46% of Mo, 0.38% of Cu and the balance of Fe.
3. The material of the test plate and the backing plate is weather-resistant steel Q690qENH, and the dimension (length multiplied by width multiplied by thickness) of the welding test plate is as follows: 400 × 150 × 20mm, single groove 10 °, and weld pad dimensions (length × width × thickness): 430X 30X 12 mm. The welding process parameters are as follows: the current 520-. The chemical components, corrosion resistance index, mechanical properties and low-temperature toughness of the corresponding deposited metal obtained by welding are shown in Table 2,
TABLE 2 chemical composition, corrosion resistance index, mechanical properties of deposited metal
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A low yield ratio high toughness submerged arc welding material for Q690-grade weather-resistant bridges is characterized in that: the flux comprises, by mass, 21-26% of fluorite, 30-35% of magnesite, 10-17% of wollastonite, and feldspar: 5-10 percent of aluminum oxide, 15-20 percent of ferrosilicon, 0.5-2 percent of ferrosilicon and 0.5-2 percent of ferromanganese; preferably, the binder is water glass, and the mass of the binder is 20-30% of the total mass of the medicinal powder.
2. The low yield ratio high toughness submerged arc welding material for the Q690-grade weather resistant bridge of claim 1, wherein: according to the mass percentage of the components,
fluorite: CaF2≥96％，SiO2≤3％，S≤0.01％，P≤0.01％；
Magnesia: mg is more than or equal to 90 percent and SiO2≤4.8％，CaO≤2％，S≤0.03％，P≤0.03％；
Wollastonite: CaO is more than or equal to 40 percent, Si is more than or equal to 45 percent, and SiO2 45-55％，S≤0.03％，P≤0.03％；
Feldspar; SiO 22 60％，Al2O3≤20％，K2O+Na2O≥12％，S≤0.015％，P≤0.015％；
Alumina: al (Al)2O3≥98％，SiO2≤0.1％，Fe2O3≤0.05％，Na2O≤0.6％；
Silicon iron: si 40-47%, S less than or equal to 0.02%, P less than or equal to 0.03%;
ferromanganese: c is less than or equal to 1 percent, Mn is more than or equal to 78 percent, Si is less than or equal to 2 percent, S is less than or equal to 0.015 percent, and P is less than or equal to 0.015 percent.
3. The Q690 grade weather-resistant submerged arc welding material with low yield ratio and high toughness for the bridge, which is prepared according to the claim 1 or 2, is characterized in that: the preparation method of the welding flux comprises the following steps,
the method comprises the following steps: putting the components of the flux into a mixer according to requirements, stirring and mixing uniformly, adding 20-30% of water glass as a binder, mixing and granulating;
step two: and (3) baking the semi-finished flux at low temperature: 300 ℃ and 400 ℃, and the time is 1 h; and then baking at high temperature: 700 ℃ and 800 ℃ for 1h, and after baking, screening is carried out, wherein the granularity is 12-60 meshes.
4. The Q690 grade weather-resistant submerged arc welding material with low yield ratio and high toughness for the bridge, which is prepared according to the claim 1 or 2, is characterized in that: the adhesive is high-modulus potassium-sodium water glass, the modulus is 3.0-3.1, the concentration is 35-40B' e, and the mass ratio of potassium to sodium is 1: 1.
5. the low yield ratio high toughness submerged arc welding material for the Q690 grade weather resistant bridge of claim 3, wherein: and (3) low-temperature baking: the temperature is 350 ℃, and the time is 1 h; and (3) high-temperature baking: 720 ℃; the time is 1 h.
6. The Q690 grade weather-resistant submerged arc welding material with low yield ratio and high toughness for the bridge according to any one of claims 1 to 5, wherein: the welding wire comprises, by weight, 0.078% of C, 1.73% of Mn, 0.34% of Si, 0.003% of S, 0.007% of P, 0.43% of Cr, 1.68% of Ni, 0.46% of Mo, 0.38% of Cu and the balance of Fe, wherein the sum of the mass percentages of the components is 100%.
7. The high-toughness submerged arc welding material with low yield ratio for the Q690-grade weather-resistant bridge according to any one of claims 1 to 6, wherein: the overall properties of the deposited metal are as follows: the yield strength Rp0.2 is more than or equal to 690 MPa; the tensile strength Rm is more than or equal to 810 MPa; yield ratio Rm/RP0.2 is 0.78-0.85; the elongation A is more than or equal to 14 percent; the impact energy Akv is more than or equal to 100J at the temperature of minus 40 ℃; the weather resistance index I is more than or equal to 6.5.
8. A method for welding by using the low yield ratio high toughness submerged arc welding material for the Q690-grade weather-resistant bridge as claimed in any one of claims 1 to 7, wherein: the current is 520-580A, the voltage is 28-31V, the speed is 24-30m/h, and the temperature between channels is 150-180 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115319331A (en) * | 2022-09-07 | 2022-11-11 | 四川大西洋焊接材料股份有限公司 | Submerged arc welding flux for vanadium-chromium-molybdenum steel, preparation method, wire agent combination and application |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6234695A (en) * | 1985-08-06 | 1987-02-14 | Nippon Steel Corp | Calcined flux for stainless steel |
| CN102581518A (en) * | 2012-03-23 | 2012-07-18 | 北京金威焊材有限公司 | Sintered flux for stainless steel surfacing with band electrode |
| CN104668816A (en) * | 2015-01-09 | 2015-06-03 | 天津重型装备工程研究有限公司 | Submerged-arc welding flux for low-alloy-steel narrow-gap welding and preparation method thereof |
| CN107745203A (en) * | 2017-09-29 | 2018-03-02 | 四川西冶新材料股份有限公司 | Large-scale water power 800MPa level high-strength steel submerged arc fluxes and its production method |
| CN109048117A (en) * | 2018-07-26 | 2018-12-21 | 钢铁研究总院 | Antidetonation is anti-corrosion 690MPa grades of welding wire for submerged-arc welding of fire-resistive construction structural steel |
| CN109530976A (en) * | 2019-01-03 | 2019-03-29 | 四川西冶新材料股份有限公司 | Bridge mating solder flux of 800MPa weather-resistant and high-strength steel and preparation method thereof |
| CN111037155A (en) * | 2019-12-31 | 2020-04-21 | 四川西冶新材料股份有限公司 | 850 MPa-grade weather-proof high-strength steel matched submerged-arc welding flux |
| CN111660038A (en) * | 2020-05-07 | 2020-09-15 | 中国船舶重工集团公司第七二五研究所 | Sintered flux for welding high-manganese low-temperature steel and preparation method thereof |
-
2021
- 2021-02-09 CN CN202110186991.7A patent/CN112975211A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6234695A (en) * | 1985-08-06 | 1987-02-14 | Nippon Steel Corp | Calcined flux for stainless steel |
| CN102581518A (en) * | 2012-03-23 | 2012-07-18 | 北京金威焊材有限公司 | Sintered flux for stainless steel surfacing with band electrode |
| CN104668816A (en) * | 2015-01-09 | 2015-06-03 | 天津重型装备工程研究有限公司 | Submerged-arc welding flux for low-alloy-steel narrow-gap welding and preparation method thereof |
| CN107745203A (en) * | 2017-09-29 | 2018-03-02 | 四川西冶新材料股份有限公司 | Large-scale water power 800MPa level high-strength steel submerged arc fluxes and its production method |
| CN109048117A (en) * | 2018-07-26 | 2018-12-21 | 钢铁研究总院 | Antidetonation is anti-corrosion 690MPa grades of welding wire for submerged-arc welding of fire-resistive construction structural steel |
| CN109530976A (en) * | 2019-01-03 | 2019-03-29 | 四川西冶新材料股份有限公司 | Bridge mating solder flux of 800MPa weather-resistant and high-strength steel and preparation method thereof |
| CN111037155A (en) * | 2019-12-31 | 2020-04-21 | 四川西冶新材料股份有限公司 | 850 MPa-grade weather-proof high-strength steel matched submerged-arc welding flux |
| CN111660038A (en) * | 2020-05-07 | 2020-09-15 | 中国船舶重工集团公司第七二五研究所 | Sintered flux for welding high-manganese low-temperature steel and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115319331A (en) * | 2022-09-07 | 2022-11-11 | 四川大西洋焊接材料股份有限公司 | Submerged arc welding flux for vanadium-chromium-molybdenum steel, preparation method, wire agent combination and application |
| CN115319331B (en) * | 2022-09-07 | 2024-03-26 | 四川大西洋焊接材料股份有限公司 | Submerged arc welding flux for vanadium-chromium-molybdenum-added steel, preparation method, wire agent combination and application |
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