CN108907494B - Nuclear power AG728 steel welding rod and preparation method thereof - Google Patents
Nuclear power AG728 steel welding rod and preparation method thereof Download PDFInfo
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- CN108907494B CN108907494B CN201810555476.XA CN201810555476A CN108907494B CN 108907494 B CN108907494 B CN 108907494B CN 201810555476 A CN201810555476 A CN 201810555476A CN 108907494 B CN108907494 B CN 108907494B
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- 238000003466 welding Methods 0.000 title claims abstract description 92
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 27
- 238000000576 coating method Methods 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 16
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 15
- 239000010436 fluorite Substances 0.000 claims abstract description 15
- 239000004579 marble Substances 0.000 claims abstract description 15
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 14
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 14
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 14
- 239000000661 sodium alginate Substances 0.000 claims abstract description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000010703 silicon Substances 0.000 claims abstract description 13
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims abstract description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000010439 graphite Substances 0.000 claims abstract description 12
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 12
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000011572 manganese Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 235000019353 potassium silicate Nutrition 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 abstract description 7
- 238000010891 electric arc Methods 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 7
- 235000017550 sodium carbonate Nutrition 0.000 description 7
- 229910052748 manganese Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011591 potassium Substances 0.000 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 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 2
- 229910000870 Weathering steel Inorganic materials 0.000 description 2
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
-
- 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
Abstract
The invention discloses a nuclear power AG728 steel welding rod and a preparation method thereof, which consists of a core wire and a coating wrapped on the surface of the core wire, wherein the coating comprises the following components in percentage by weight: 7.5 to 10.5 parts of marble, 5 to 7.5 parts of fluorite, 0.75 to 1.25 parts of rutile, 0.5 to 1.5 parts of silicon micropowder, 1 to 1.5 parts of electrolytic manganese, 1.0 to 1.5 parts of ferrosilicon, 0.4 to 0.55 part of ferromolybdenum, 0.025 to 0.05 part of graphite, 5 to 6 parts of iron powder, 0.1 to 0.2 part of calcined soda, 0.1 to 0.15 part of sodium alginate, 0.1 to 0.15 part of CMC, 0.2 to 0.3 part of magnesium powder and 1.2 to 1.5 parts of nickel powder. Compared with the prior art, the welding rod matched with the invention for welding nuclear AG728 steel has the advantages of stable electric arc, small splashing, clear and regular molten pool, good slag removal performance and attractive weld formation.
Description
Technical Field
The invention relates to the technical field of nuclear power welding materials, in particular to a nuclear power AG728 steel welding rod, a preparation method and a welding method.
Background
With the development of nuclear power industry in China, the localization of high-end welding materials in the nuclear power equipment manufacturing industry is a very important link in realizing the manufacturing autonomy of large-scale equipment and the autonomous construction process of a nuclear power station.
With the rapid development of nuclear power technology, the requirements on high-strength containment steel plates are higher and higher, the steel smelting process is related, the innovation speed of the rolling technology is higher and higher, the rolling technology is more and more widely applied to the primary and secondary nuclear industries, and corresponding matched welding materials are urgently needed.
For example, 103934592A discloses a core wire and a coating of a 55 kilogram-grade weathering steel welding rod, the welding rod comprises the core wire and the coating, the coating is formed by uniformly mixing and stirring solid components and water glass, and the water glass accounts for 22-24% of the solid components by mass. The solid component comprises the following components in parts by mass: 20-30 parts of marble, 15-25 parts of fluorite, 3-6 parts of natural rutile, 2-6 parts of potassium feldspar, 3-6 parts of ferrotitanium, 2-6 parts of medium carbon ferromanganese, 2-5 parts of ferrosilicon, 1-2 parts of carbon ferrochrome, 1-2 parts of nickel powder, 1-2 parts of copper powder, 0.5-1 part of sodium alginate and 20-30 parts of iron powder. The technical condition of the weather-resistant steel welding rod is in a welding state, and if the weather-resistant steel welding rod is used for welding nuclear AG728 steel, a root fusion line is easy to crack.
106624467A also discloses a matched welding rod suitable for Q500QE steel for bridges, which consists of a core wire and a coating wrapped on the surface of the core wire, wherein the coating consists of the following components in percentage by weight: 300-400 parts of marble, 200-320 parts of fluorite, 30-100 parts of rutile, 4-7 parts of soda ash, 1-5 parts of zircon sand, 150-350 parts of iron powder, 10-20 parts of electrolytic manganese, 10-40 parts of silicon micro powder, 10-20 parts of ice crystal powder, 5-10 parts of nickel powder, 2-5 parts of molybdenum powder, 5-10 parts of potassium titanate and 5-10 parts of potassium fluosilicate. If the welding rod is used for welding nuclear AG728 steel, the oblique Y-shaped crack resistance test of the welding rod is unqualified, and the mechanical property of the welding rod after heat treatment can not meet the technical requirements of AG728 steel.
103934592B also discloses a 55 kg-level weathering steel welding rod, which comprises a core wire and a coating, wherein the coating is formed by mixing and stirring solid components and water glass uniformly, and the water glass accounts for 22-24% of the solid components by mass. The solid component comprises the following components in parts by mass: 20-30 parts of marble, 15-25 parts of fluorite, 3-6 parts of natural rutile, 2-6 parts of potassium feldspar, 3-6 parts of ferrotitanium, 2-6 parts of medium carbon ferromanganese, 2-5 parts of ferrosilicon, 1-2 parts of carbon ferrochrome, 1-2 parts of nickel powder, 1-2 parts of copper powder, 0.5-1 part of sodium alginate and 20-30 parts of iron powder. If the welding rod is used for welding nuclear AG728 steel, the oblique Y-shaped crack resistance test of the welding rod is unqualified, and the mechanical property of the welding rod after heat treatment can not meet the technical requirements of AG728 steel.
Disclosure of Invention
The invention aims to provide a welding rod for nuclear AG728 steel and a preparation method thereof, wherein the welding rod is used for welding the nuclear AG728 steel, the electric arc is stable, the splashing is small, the molten pool is clear and regular, the slag removal performance is good, and the welding seam is attractive in shape.
The technical scheme is as follows: a nuclear power AG728 steel welding rod and a preparation method thereof, which comprises a core wire and a coating wrapped on the surface of the core wire, wherein the coating comprises the following components in percentage by weight: 7.5 to 10.5 parts of marble, 5 to 7.5 parts of fluorite, 0.75 to 1.25 parts of rutile, 0.5 to 1.5 parts of silicon micropowder, 1 to 1.5 parts of electrolytic manganese, 1.0 to 1.5 parts of ferrosilicon, 0.4 to 0.55 part of ferromolybdenum, 0.025 to 0.05 part of graphite, 5 to 6 parts of iron powder, 0.1 to 0.2 part of calcined soda, 0.1 to 0.15 part of sodium alginate, 0.1 to 0.15 part of CMC, 0.2 to 0.3 part of magnesium powder and 1.2 to 1.5 parts of nickel powder.
Preferably, the weight of the coating is as follows: the weight of the core wire is 25-27: 100.
preferably, the chemical components of the core wire are 0.04-0.08% of C, 0.3-0.6% of Mn, 0.01-0.03% of Si, less than or equal to 0.005% of S, less than or equal to 0.008% of P and the balance of Fe and impurities.
Preferably, the marble is 9.5 parts by weight, the fluorite is 5 parts by weight, the rutile is 0.8 part by weight, the silicon micropowder is 1 part by weight, the electrolytic manganese is 1.5 parts by weight, the ferrosilicon is 1.3 parts by weight, the ferromolybdenum is 0.5 part by weight, the graphite is 0.025 part by weight, the iron powder is 5 parts by weight, the soda ash is 0.2 part by weight, the sodium alginate is 0.15 part by weight, the CMC is 0.1 part by weight, the nickel powder is 1.5 parts by weight, and the magnesium powder is 0.3 part by weight.
Preferably, the marble is 9.5 parts by weight, the fluorite is 5 parts by weight, the rutile is 0.8 part by weight, the silicon micropowder is 1 part by weight, the electrolytic manganese is 1.2 parts by weight, the ferrosilicon is 1.5 parts by weight, the ferromolybdenum is 0.45 part by weight, the graphite is 0.025 part by weight, the iron powder is 5 parts by weight, the soda ash is 0.2 part by weight, the sodium alginate is 0.15 part by weight, the CMC is 0.1 part by weight, the nickel powder is 1.5 parts by weight, and the magnesium powder is 0.3 part by weight.
Preferably, the marble is 9.5 parts by weight, the fluorite is 5 parts by weight, the rutile is 0.8 part by weight, the silicon micropowder is 1 part by weight, the electrolytic manganese is 1.35 parts by weight, the ferrosilicon is 1.4 parts by weight, the ferromolybdenum is 0.45 part by weight, the graphite is 0.025 part by weight, the iron powder is 5 parts by weight, the soda ash is 0.2 part by weight, the sodium alginate is 0.15 part by weight, the CMC is 0.1 part by weight, the nickel powder is 1.5 parts by weight, and the magnesium powder is 0.3 part by weight.
The invention also aims to provide a preparation method of the welding rod for the nuclear power AG728 steel.
The technical scheme is as follows: a preparation method of a nuclear power AG728 steel welding rod comprises the following steps:
firstly, uniformly mixing the powder of the coating;
secondly, adding a binder accounting for 20 to 24 percent of the total weight of the medicinal powder, stirring and mixing uniformly, and feeding the mixture into a welding rod coating press to coat the mixture on a welding core under the pressure of 14 to 16 MPa;
thirdly, baking the mixture for 4 to 6.5 hours at the low temperature of between 85 and 90 ℃ and baking the mixture for 1 to 2 hours at the high temperature of between 350 and 400 ℃ to obtain the welding rod.
Preferably, the binder is water glass with a potassium-sodium ratio of 1:1 of 41.3-41.7 Be' at 20 ℃, and the modulus is 3.1M.
The invention also aims to provide a welding method of nuclear power AG728 steel.
The technical scheme is as follows: a welding method of nuclear AG728 steel adopts the welding rod of the nuclear AG728 steel.
Preferably, the welding method is carried out at the upper position, the welding heat input is 30-35KJ/cm, the tensile strength of the normal-temperature deposited metal is more than or equal to 655MPa, the yield strength is more than or equal to 485MPa, the elongation after fracture is more than or equal to 20 percent, and the impact at minus 30 ℃ is more than or equal to 54J after being welded at 595-620 ℃ for 15min and 595-620 ℃ for 12h30 min.
The invention principle is as follows: the invention realizes the aim by organically combining the components of the coating and matching the coating with the carbon steel core wire.
Has the advantages that:
the invention aims at newly developing a furnace AG728 steel plate and develops a matched manual electric arc welding electrode. On the basis of the existing slag system, the slag-forming and gas-forming agent is changed, corresponding alloy elements are added, and the matched welding rod is innovatively developed on the aspects of technological property and mechanical property.
The welding rod disclosed by the invention is used for welding a new generation of nuclear AG728 steel, the welding heat input is 30-35KJ/cm in the upward position, the tensile strength of normal-temperature deposited metal is more than or equal to 655MPa, the yield strength is more than or equal to 485MPa, the elongation after fracture is more than or equal to 20%, and the impact at minus 30 ℃ is more than or equal to 54J after welding at 595-620 ℃ for 15min and 595-620 ℃ for 12h for 30 min.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Taking a coating and a core wire, wherein the core wire is 100g (the core wire comprises, by mass, 0.04-0.08% of C, 0.3-0.6% of Mn, 0.01-0.03% of Si, less than or equal to 0.005% of S, less than or equal to 0.008% of P, and the balance of iron and trace impurities), and the coating comprises the following components in percentage by mass: 9.5 parts of marble, 5 parts of fluorite, 0.8 part of rutile, 1 part of silicon micropowder, 1.5 parts of electrolytic manganese, 1.3 parts of ferrosilicon, 0.5 part of ferromolybdenum, 0.025 part of graphite, 5 parts of iron powder, 0.2 part of soda ash, 0.15 part of sodium alginate, 0.1 part of CMC, 1.5 parts of nickel powder and 0.3 part of magnesium powder.
Mixing the above components, adding 21 wt% of sodium-potassium water glass (with a ratio of potassium to sodium of 1:1 at 20 deg.C) and Baume concentration of 41.3-41.7 ° Be, and stirring for 10-15 min. The welding wire is coated on a core wire on oil pressure type welding rod production equipment by using a conventional process. And baking at low temperature of 85 ℃ for 3.5-4 hours and at high temperature of 380 ℃ for 1.5 hours to obtain the welding rod.
And carrying out a welding test on the obtained welding rod (vertical position and direct current reverse connection), wherein the base material is nuclear AG728 steel, the welding rod is vertically positioned, the welding heat input is 30-35KJ/cm, the electric arc is stable, the splashing is small, the molten pool is clear and regular, the slag removal performance is good, and the welding seam is attractive in appearance.
The deposited metal comprises the following chemical components: c: 0.081 wt%, Mn: 1.44 wt%, Si: 0.28 wt%, S: 0.0037 wt%, P: 0.0055 wt%, Cr: 0.029 wt%, Ni: 2.38 wt%, Mo: 0.39 wt%, V: 0.0086 wt%, Cu: 0.022 wt%, Nb 0.0046 wt%, Ti 0.0097 wt%, Sn 0.0068 wt%, As 0.0048 wt%, Al 0.0005 wt%, and the balance of Fe and impurity elements.
The deposited metal has the following mechanical properties in the following table 1:
TABLE 1 mechanical Properties of deposited metal by welding rod
Example 2
Taking a coating and a core wire, wherein the core wire is 100g, and the coating comprises the following components in percentage by weight: 9.5 parts of marble, 5 parts of fluorite, 0.8 part of rutile, 1 part of silicon micropowder, 1.2 parts of electrolytic manganese, 1.5 parts of ferrosilicon, 0.45 part of ferromolybdenum, 0.025 part of graphite, 5 parts of iron powder, 0.2 part of soda ash, 0.15 part of sodium alginate, 0.1 part of CMC, 1.5 parts of nickel powder and 0.3 part of magnesium powder.
Mixing the above components, adding 21 wt% of sodium-potassium water glass (with a ratio of potassium to sodium of 1:1 at 20 deg.C) and Baume concentration of 41.3-41.7 ° Be, and stirring for 10-15 min. The welding wire is coated on a core wire on oil pressure type welding rod production equipment by using a conventional process. And baking at low temperature of 85 ℃ for 3.5-4 hours and at high temperature of 380 ℃ for 1.5 hours to obtain the welding rod.
And carrying out a welding test on the obtained welding rod (vertical position and direct current reverse connection), wherein the base material is nuclear AG728 steel, the welding rod is vertically positioned, the welding heat input is 30-35KJ/cm, the electric arc is stable, the splashing is small, the molten pool is clear and regular, the slag removal performance is good, and the welding seam is attractive in appearance.
The deposited metal comprises the following chemical components: c: 0.079 wt%, Mn: 1.26 wt%, Si: 0.26 wt%, S: 0.0033 wt%, P: 0.0067 wt%, Cr: 0.029 wt%, Ni: 2.38 wt%, Mo: 0.36 wt%, V: 0.0066 wt%, Cu: 0.021 wt%, Nb 0.0051 wt%, Ti 0.0089 wt%, Sn 0.0066 wt%, As 0.0045 wt%, Al 0.0005 wt%, and the balance Fe and impurity elements.
The deposited metal has the following mechanical properties in the following table 2:
TABLE 2 mechanical properties of deposited metal of welding rod
Example 3
Taking a coating and a core wire, wherein the core wire is 100g, and the coating comprises the following components in percentage by weight: 9.5 parts of marble, 5 parts of fluorite, 0.8 part of rutile, 1 part of silicon micropowder, 1.35 parts of electrolytic manganese, 1.4 parts of ferrosilicon, 0.45 part of ferromolybdenum, 0.025 part of graphite, 5 parts of iron powder, 0.2 part of soda ash, 0.15 part of sodium alginate, 0.1 part of CMC, 1.5 parts of nickel powder and 0.3 part of magnesium powder.
Mixing the above components, adding 21 wt% of sodium-potassium water glass (with a ratio of potassium to sodium of 1:1 at 20 deg.C) and Baume concentration of 41.3-41.7 ° Be, and stirring for 10-15 min. The welding wire is coated on a core wire on oil pressure type welding rod production equipment by using a conventional process. And baking at low temperature of 85 ℃ for 3.5-4 hours and at high temperature of 380 ℃ for 1.5 hours to obtain the welding rod.
And carrying out a welding test on the obtained welding rod (vertical position and direct current reverse connection), wherein the base material is nuclear AG728 steel, the welding rod is vertically positioned, the welding heat input is 30-35KJ/cm, the electric arc is stable, the splashing is small, the molten pool is clear and regular, the slag removal performance is good, and the welding seam is attractive in appearance.
The deposited metal comprises the following chemical components: c: 0.082 wt%, Mn: 1.33 wt%, Si: 0.27 wt%, S: 0.0033 wt%, P: 0.0067 wt%, Cr: 0.029 wt%, Ni: 2.38 wt%, Mo: 0.38 wt%, V: 0.0058 wt%, Cu: 0.019 wt%, Nb 0.0049 wt%, Ti 0.0091 wt%, Sn 0.0062 wt%, As 0.0046 wt%, Al 0.0005 wt%, and the balance of Fe and impurity elements.
The deposited metal has the following mechanical properties in the following table 3:
TABLE 3 mechanical properties of deposited metal of welding rod
In the present invention, the raw material and the core wire are commercially available. The welding rod is used for welding nuclear power AG728 steel by controlling the composition and the components and an alkaline slag system, strictly controls the content of impurity elements of deposited metal, and ensures that the deposited metal with good mechanical property is obtained.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.
Claims (9)
1. A nuclear power AG728 steel welding rod comprises a core wire and a coating wrapped on the surface of the core wire, wherein the coating comprises the following components in percentage by weight: 7.5 to 10.5 parts of marble, 5 to 7.5 parts of fluorite, 0.75 to 1.25 parts of rutile, 0.5 to 1.5 parts of silicon micropowder, 1 to 1.5 parts of electrolytic manganese, 1.0 to 1.5 parts of ferrosilicon, 0.4 to 0.55 part of ferromolybdenum, 0.025 to 0.05 part of graphite, 5 to 6 parts of iron powder, 0.1 to 0.2 part of calcined soda, 0.1 to 0.15 part of sodium alginate, 0.1 to 0.15 part of CMC, 0.2 to 0.3 part of magnesium powder and 1.2 to 1.5 parts of nickel powder; the chemical components of the core wire are 0.04-0.08% of C, 0.3-0.6% of Mn, 0.01-0.03% of Si, less than or equal to 0.005% of S, less than or equal to 0.008% of P and the balance of Fe and impurities.
2. The nuclear power AG728 steel welding electrode of claim 1, wherein: the weight of the coating is as follows: the weight of the core wire is 25-27: 100.
3. the nuclear power AG728 steel welding electrode of any one of claims 1 or 2, wherein: 9.5 parts of marble, 5 parts of fluorite, 0.8 part of rutile, 1 part of silicon micropowder, 1.5 parts of electrolytic manganese, 1.3 parts of ferrosilicon, 0.5 part of ferromolybdenum, 0.025 part of graphite, 5 parts of iron powder, 0.2 part of calcined soda, 0.15 part of sodium alginate, 0.1 part of CMC, 1.5 parts of nickel powder and 0.3 part of magnesium powder.
4. The nuclear power AG728 steel welding electrode of any of claims 1-2, wherein: 9.5 parts of marble, 5 parts of fluorite, 0.8 part of rutile, 1 part of silicon micropowder, 1.2 parts of electrolytic manganese, 1.5 parts of ferrosilicon, 0.45 part of ferromolybdenum, 0.025 part of graphite, 5 parts of iron powder, 0.2 part of calcined soda, 0.15 part of sodium alginate, 0.1 part of CMC, 1.5 parts of nickel powder and 0.3 part of magnesium powder.
5. The nuclear power AG728 steel welding electrode of any of claims 1-2, wherein: 9.5 parts of marble, 5 parts of fluorite, 0.8 part of rutile, 1 part of silicon micropowder, 1.35 parts of electrolytic manganese, 1.4 parts of ferrosilicon, 0.45 part of ferromolybdenum, 0.025 part of graphite, 5 parts of iron powder, 0.2 part of calcined soda, 0.15 part of sodium alginate, 0.1 part of CMC, 1.5 parts of nickel powder and 0.3 part of magnesium powder.
6. A method for preparing the nuclear power AG728 steel welding electrode of any one of claims 1 to 5, comprising the following steps:
firstly, uniformly mixing the powder of the coating;
secondly, adding a binder accounting for 20 to 24 percent of the total weight of the medicinal powder, stirring and mixing uniformly, and feeding the mixture into a welding rod coating press to coat the mixture on a welding core under the pressure of 14 to 16 MPa;
thirdly, baking the mixture for 4 to 6.5 hours at the low temperature of between 85 and 90 ℃ and baking the mixture for 1 to 2 hours at the high temperature of between 350 and 400 ℃ to obtain the welding rod.
7. The method for preparing the nuclear power AG728 steel welding rod according to claim 6, wherein the method comprises the following steps: the binder is water glass with a potassium-sodium ratio of 1:1 of 41.3-41.7 Be' at 20 ℃, and the modulus is 3.1M.
8. A welding method of nuclear AG728 steel, which adopts the nuclear AG728 steel welding rod of any claim 1 to 5.
9. The welding method of nuclear AG728 steel as claimed in claim 8, wherein: the welding method is vertically arranged, the welding heat input is 30-35KJ/cm, the tensile strength of normal-temperature deposited metal is more than or equal to 655MPa, the yield strength is more than or equal to 485MPa, the elongation after fracture is more than or equal to 20 percent, and the impact at minus 30 ℃ is more than or equal to 54J after welding at 595-620 ℃ for 15min and 595-620 ℃ for 12h30 min.
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