CN110640355A - Welding flux matched with nickel-based welding strip with high Mn content and high Nb content and capable of preventing crack defects and welding method - Google Patents
Welding flux matched with nickel-based welding strip with high Mn content and high Nb content and capable of preventing crack defects and welding method Download PDFInfo
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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
- B23K35/3601—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
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
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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
- B23K35/24—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
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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
- B23K35/24—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
- B23K35/3033—Ni as the principal constituent
- B23K35/304—Ni as the principal constituent with Cr as the next major constituent
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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
- B23K35/3601—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
- B23K35/3602—Carbonates, basic oxides or hydroxides
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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
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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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/053—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 30% but less than 40%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
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- Nonmetallic Welding Materials (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a welding flux and a welding method matched with a nickel-based welding strip with high Mn and high Nb crack resistance defects. The invention aims to provide a welding flux matched with a nickel-based welding strip with high Mn and Nb cracking resistance and a welding method. The flux of the invention is made of CaF2、SiO2、Al2O3、CaO、MgO、Cr2O3Iron alloy or NaF, S and P. The welding method comprises the following steps: the welding current is 950-1100A, the welding voltage is 28V, the welding speed is 180mm/min, and the thickness of the overlaying layer is 30 mm. The invention solves the problem of high crack sensitivity of similar products, provides novel alloy components with high Mn and high Nb, and solves the problem of large-thickness thermal cracking in engineering application. The invention is applied to the field of nuclear power welding.
Description
Technical Field
The invention relates to a welding flux matched with a nickel-based welding strip with high Mn content and high Nb content and a welding method.
Background
Along with the development of nuclear power industry, the surface of one side of a tube plate of a steam generator of a pressurized water reactor nuclear power station needs large-area surfacing of nickel-based alloy, wherein a strip surfacing material is the most common method, the surfacing efficiency is high, and the welding mode comprises the following steps: strip electroslag surfacing and submerged arc surfacing, but the submerged arc type welding flux has wide application. According to the requirements of nuclear power technology and corrosion medium, materials of the welding strip are gradually developed from INCONEL 600 to INCONEL 690, the surfacing materials of the steam generator tube plate in the third-generation nuclear power technology are all made of INCONEL 690 materials, the INCONEL 690 is subjected to EQNiCrFe-7A, the EQNiCrFe-7A is used more, but problems such as DDC cracks and the like are not solved, the welding strip is developed to EQNiCrFe-14 at present, but crack sensitivity is larger, the problem of large-thickness surfacing crack sensitivity is solved by adding alloy elements such as Mn and Nb with crack defects through system test research, corresponding submerged arc type welding flux is not developed or is not mature at present, and the development of novel welding flux becomes more important and can meet the actual needs of engineering.
Disclosure of Invention
The invention aims to provide a welding flux matched with a nickel-based welding strip with high Mn and Nb cracking resistance and a welding method.
The flux matched with the nickel-based solder strip with high Mn content and high Nb content and capable of resisting crack defects is prepared from 25-50 parts by mass of CaF25-20 parts of SiO210-40 parts of Al2O38-20 parts of CaO, 4-15 parts of MgO and Cr2O3Not more than 5 parts, not more than 8 parts of ferroalloy, not more than 0.015 part of S and not more than 0.02 part of P.
The flux matched with the nickel-based solder strip with high Mn content and high Nb content and capable of resisting crack defects is prepared from 25-50 parts by mass of CaF25-20 parts of SiO210-40 parts of Al2O38-20 parts of CaO, 4-15 parts of MgO and Cr2O3Not more than 5 parts, not more than 5 parts of NaF, not more than 0.015 part of S and not more than 0.02 part of P.
The method for welding by using the nickel-based welding strip with high Mn and high Nb crack defects and the matched welding flux comprises the following steps: carrying out surfacing by using a nickel-based welding strip with high Mn and high Nb and anti-crack defects and a matched welding flux by adopting a strip submerged arc surfacing technology to obtain surfacing metal; wherein the submerged arc welding process parameters are as follows: the welding current is 950-1100A, the welding voltage is 28V, the welding speed is 180mm/min, and the thickness of the overlaying layer is 30 mm.
The invention provides a novel submerged arc type sintered flux matched with a welding strip, which has reasonable component design, can ensure the crack sensitivity of a surfacing layer and has wider welding process parameters. Effective impurity element control, reasonable alkalinity design, solving the problem that the multilayer welding process performance is easy to have slag sticking and undercut phenomena.
CaF2: the main functions are slagging, desulfurizing and dehydrogenating. Because of the higher viscosity of the nickel-based alloy, the spreading property of the surfacing metal is generally required to be increased, the tendency of undercut and the like is reduced, and CaF2Too low, weldingThe slag removal performance of the agent is reduced, the viscosity of slag is increased, the forming is poor, and the undercut phenomenon occurs in the lapping process, so that the amount is desirably high, but the forming of surfacing metal is reduced too much, the arc form is not obvious, and simultaneously excessive impurity elements are brought in, so that the nickel-based crack sensitivity is increased.
SiO2: the main functions are slag removal and improvement of technological properties, but when the content is excessive, the oxidability is enhanced, the burning loss of the alloy elements of the surfacing layer is increased, the mechanical property and the corrosion property of surfacing metal are reduced, and meanwhile, excessive SiO is used2It will also lead to increased silicon content in the weld metal and increased crack sensitivity of the weld metal, for which SiO is the cause2The content is preferably controlled to 5-15%.
Al2O3The main function is slag removal, the slag belongs to neutral oxide, the weld bead forming can be improved, when the content is too low, the melting point and viscosity of the slag are low, the coverage is poor, the corrugation of the weld bead is thick, when the content is too high, the melting point of the slag is increased, the high-temperature retention time of the weld bead is short, the spreading performance is poor, the undercut phenomenon of the weld bead is easy to occur, and the corrugation is thick.
CaO: the main effect is slagging, the effect of adjustment basicity, the effect of stable electric arc prevents to splash and has certain benefit, and CaO has the effect of taking off S simultaneously, can improve the purity of nickel base build-up welding metal, but the too high welding seam shaping that can influence of content, and the slagging difficulty.
MgO: the method mainly comprises slagging and improving the alkalinity of molten slag, but MgO has higher melting point and is added too high, the solidification temperature of the molten slag is increased too much, the fluidity of the slag is inhibited, and when the addition amount exceeds 15 percent, the welding bead forming becomes poor and the slag removal is difficult.
Cr2O3The method improves the weld forming and has certain benefits for slag removal.
NaF: the wettability of the surfacing metal is increased, and undercut is prevented.
Alloying agent (iron alloy): the main functions are deoxidation and alloy burning loss supplement, and a certain amount of alloy is added to reduce the nickel base crack sensitivity and improve the mechanical property of the metal.
The invention summarizes the nickel-based alloy welding which is mature at presentOn the basis of the welding material, the influence of each alloy element on the mechanical property, the corrosion resistance and the crack resistance of the nickel-based alloy welding material is comprehensively considered, and the alloy components are optimized, so that the performance of the nickel-based alloy welding material is guaranteed to reach the standard, the nickel-based alloy has higher welding hot crack sensitivity in the welding process, cracks are easy to generate in an arc pit, an intercrystalline liquid film is the most main metallurgical factor for initiating the solidification cracks of a single-phase structure of the nickel-based alloy, the internal components are uneven or a molten pool is not clean, C, S, P, Si and other elements form low-melting-point eutectic crystals in the molten pool, the impurity segregation phenomenon is serious in the crystallization process, and in order to prevent the generation of the welding hot cracks, the contents of S, P and other impurities are required to be. First, flux impurity elements C, SiO are tightly controlled2S, P content. Powder and alloy with low content of S, P and other impurity elements are selected as raw materials for preparing the welding flux, and the content of alloying elements such as Nb, Ti, Mn, Mo and the like is adjusted to reduce the sensitivity of deposited metal crystal cracks and DDC. The flux developed for the purpose needs to ensure various mechanical properties and crack sensitivity of the surfacing metal and have good welding process performance, particularly multilayer welding process performance, the viscosity of a nickel-based material is high, and slag adhesion is easy to occur in the process of welding multilayer welding.
The nickel-based submerged arc surfacing flux disclosed by the invention is matched with a novel nickel-based high-Mn high-Nb welding strip, is suitable for surfacing of important structural components such as a reactor pressure vessel, a steam generator tube plate surfacing and the like, has excellent deslagging performance, better weld bead spreading performance, no undercut phenomenon, no slag adhesion during multilayer welding and easiness in deslagging, and solves key indexes such as crystal cracks, DDC cracks and the like of a nickel-based material surfacing layer. The welding flux has low impurity content, reduces harmful impurities brought by raw materials as much as possible, reduces S, P content in the welding flux, and ensures the purity of weld metal. The addition of CaO and ferroalloy further increases the S, P removal effect of the weld deposit metal. The optimal component proportion is found through controlling Mn and Nb alloy elements of the welding strip, the problem of high crack sensitivity of similar products is solved, the technical index of the content of S + Si is provided, the problem of large-thickness hot cracks in engineering application is solved, and other performance indexes are qualified.
Detailed Description
The first embodiment is as follows: the flux matched with the nickel-based welding strip with high Mn content and high Nb content and capable of resisting crack defects is composed of, by mass, 25-50 parts of CaF25-20 parts of SiO210-40 parts of Al2O38-20 parts of CaO, 4-15 parts of MgO and Cr2O3Not more than 5 parts, not more than 8 parts of ferroalloy, not more than 0.015 part of S and not more than 0.02 part of P.
The manufacturing method of the flux matched with the nickel-based solder strip with high Mn and high Nb crack resistance in the embodiment comprises the following steps:
preparing materials: weighing raw materials and placing the raw materials in the same container;
dry mixing: stirring to mix the powder evenly;
wet mixing: adding potassium-sodium water glass with the modulus of 2.6 and uniformly mixing;
and (3) granulation: carrying out rotary granulation on the wet material to reach 10-60 meshes to obtain granules;
and (3) sintering: sintering at high temperature in an electric furnace to eliminate moisture and crystal water of the flux, wherein the sintering temperature is 780 +/-30 ℃;
screening: and screening to form the finished flux.
The flux has low impurity content, reduces harmful impurities brought by raw materials as much as possible, reduces S, P content in the flux, and ensures the purity of weld metal. The addition of CaO and ferroalloy further increases the S, P removal effect of the weld deposit metal. The optimal component proportion is found through controlling Mn and Nb alloy elements of the welding strip, the problem of high crack sensitivity of similar products is solved, the technical index of the content of S + Si is provided, the problem of large-thickness hot cracks in engineering application is solved, and other performance indexes are qualified.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the welding flux is composed of 38-45 parts of CaF by mass27-14 parts of SiO212-35 parts of Al2O311-18 parts of CaO, 4-12 parts of MgO and 1-4 parts of Cr2O3Less than or equal to 8 parts of ferroalloy, less than or equal to 0.015 part of S and less than or equal to 0.02 part of P. Other and specific embodimentsThe first embodiment is the same.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the nickel-based welding strip with high Mn and high Nb cracking resistance comprises, by weight, not more than 0.04% of C, not more than 0.50% of Si, not more than 5.0% of Mn, not more than 0.015% of S, not more than 0.020% of P, and Cr: 28.0-31.5%, Fe: 7.0 to 12.0 percent of Nb, less than or equal to 2.5 percent of Nb, less than or equal to 0.30 percent of Cu, less than or equal to 0.50 percent of Al, less than or equal to 0.50 percent of Ti, less than or equal to 0.05 percent of Mo, less than or equal to 0.02 percent of Co and the balance of nickel. The other is the same as in the first or second embodiment.
The fourth concrete implementation mode: the flux matched with the nickel-based welding strip with high Mn content and high Nb content and capable of resisting crack defects is composed of, by mass, 25-50 parts of CaF25-20 parts of SiO210-40 parts of Al2O38-20 parts of CaO, 4-15 parts of MgO and Cr2O3Not more than 5 parts, not more than 5 parts of NaF, not more than 0.015 part of S and not more than 0.02 part of P.
The manufacturing method of the flux matched with the nickel-based solder strip with high Mn and high Nb crack resistance in the embodiment comprises the following steps:
preparing materials: weighing raw materials and placing the raw materials in the same container;
dry mixing: stirring to mix the powder evenly;
wet mixing: adding potassium-sodium water glass with the modulus of 2.6 and uniformly mixing;
and (3) granulation: carrying out rotary granulation on the wet material to reach 10-60 meshes to obtain granules;
and (3) sintering: sintering at high temperature in an electric furnace to eliminate moisture and crystal water of the flux, wherein the sintering temperature is 780 +/-30 ℃;
screening: and screening to form the finished flux.
The flux has low impurity content, reduces harmful impurities brought by raw materials as much as possible, reduces S, P content in the flux, and ensures the purity of weld metal. The addition of CaO and ferroalloy further increases the S, P removal effect of the weld deposit metal. The optimal component proportion is found through controlling Mn and Nb alloy elements of the welding strip, the problem of high crack sensitivity of similar products is solved, the technical index of the content of S + Si is provided, the problem of large-thickness hot cracks in engineering application is solved, and other performance indexes are qualified.
The fifth concrete implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the welding flux is composed of 38-45 parts of CaF by mass27-14 parts of SiO212-35 parts of Al2O311-18 parts of CaO, 4-12 parts of MgO and 1-4 parts of Cr2O3NaF is less than or equal to 5 parts, S is less than or equal to 0.015 part and P is less than or equal to 0.02 part. The rest is the same as the fourth embodiment.
The sixth specific implementation mode: the fourth or fifth embodiment is different from the specific embodiment in that: the nickel-based welding strip with high Mn and high Nb cracking resistance comprises, by weight, not more than 0.04% of C, not more than 0.50% of Si, not more than 5.0% of Mn, not more than 0.015% of S, not more than 0.020% of P, and Cr: 28.0-31.5%, Fe: 7.0 to 12.0 percent of Nb, less than or equal to 2.5 percent of Nb, less than or equal to 0.30 percent of Cu, less than or equal to 0.50 percent of Al, less than or equal to 0.50 percent of Ti, less than or equal to 0.05 percent of Mo, less than or equal to 0.02 percent of Co and the balance of nickel. The other is the same as the fourth or fifth embodiment.
The seventh embodiment: the method for welding by using the nickel-based welding strip with high Mn and high Nb and crack resistance defects and the matched welding flux comprises the following steps: carrying out surfacing by using a nickel-based welding strip with high Mn and high Nb and anti-crack defects and a matched welding flux by adopting a strip submerged arc surfacing technology to obtain surfacing metal; wherein the submerged arc welding process parameters are as follows: the welding current is 950-1100A, the welding voltage is 28V, the welding speed is 180mm/min, and the thickness of the overlaying layer is 30 mm.
The band electrode submerged arc surfacing welding of the embodiment is developed on the basis of the traditional wire electrode submerged arc welding, a welding wire is replaced by the band electrode, an electric arc is burnt under a welding flux, the band electrode is continuously melted, and the welding flux is fed back and forth in the walking direction in the welding process, so that the band electrode submerged arc surfacing welding is a main welding method for manufacturing inner wall surfacing welding of a nuclear power field container.
The specific implementation mode is eight: the seventh embodiment is different from the seventh embodiment in that: the surfacing metal comprises the following components in parts by weight: 0.017-0.025 parts of C; 0.20-0.30 part of Si; 3.5-5.0 parts of Mn; s is less than or equal to 0.003 part; p is less than or equal to 0.005 part; 28.5-31.0 parts of Cr; 7.0-8.0 parts of Fe; 1.5-2.5 parts of Nb; cu is less than or equal to 0.30 part; al is less than or equal to 0.20 part; ti is less than or equal to 0.10 part; mo is less than or equal to 0.05 percent; co is less than or equal to 0.02 percent; and simultaneously controlling the S + Si to be less than or equal to 0.358 part. The rest is the same as the seventh embodiment.
The beneficial effects of the present invention are demonstrated by the following examples:
the first embodiment is as follows: in the embodiment, the flux matched with the nickel-based solder strip with high Mn content and high Nb content and capable of resisting crack defects is prepared from 25-50 parts by mass of CaF25-20 parts of SiO210-40 parts of Al2O38-20 parts of CaO, 4-15 parts of MgO and Cr2O3Not more than 5 parts, not more than 8 parts of ferroalloy, not more than 0.015 part of S and not more than 0.02 part of P;
in the embodiment, the other welding flux matched with the nickel-based welding strip with high Mn content and high Nb content and capable of resisting crack defects is composed of, by mass, 25-50 parts of CaF25-20 parts of SiO210-40 parts of Al2O38-20 parts of CaO, 4-15 parts of MgO and Cr2O3Not more than 5 parts, not more than 5 parts of NaF, not more than 0.015 part of S and not more than 0.02 part of P.
Sieving the above flux mineral powder with 100 mesh sieve, sieving the metal powder with 40 mesh sieve, placing into a container for thoroughly dry-mixing, adding 10-30% water glass for wet-mixing, then placing into a granulator for granulation, sintering at high temperature in an electric furnace after granulation, eliminating moisture and crystal water of the flux, sintering at 780 + -30 ℃, discharging from the furnace, cooling, sieving into 10-60 mesh sintered flux, and packaging.
3 kinds of powder are respectively prepared, the formula number is FM1-FM3, and the specific components are listed in Table 1. The three materials are matched with a novel nickel-based high-Mn and proper amount of Nb welding strips. Welding was performed on SA508-III steel 40mm thick using a submerged arc welding process.
TABLE 1 welding flux formulation specific ingredients (weight percent)
| Numbering | CaF2 | Al2O3 | MgO | SiO2 | CaO | Iron alloy | Cr2O3 | S | P | NaF |
| FM1 | 38 | 20 | 4 | 19 | 11 | - | 4 | 0.014 | 0.014 | 3.972 |
| FM2 | 42 | 31 | 5 | 7 | 9 | 3.97 | 2 | 0.012 | 0.018 | - |
| FM3 | 45 | 18 | 9 | 14 | 8 | 5.47 | 0.5 | 0.014 | 0.016 | - |
TABLE 2 build-up welding Process parameters
TABLE 3 weld deposit Properties
Note: o: good Δ: better +: in general
TABLE 4 solder strip chemical composition (% by mass)
Table 5 weld deposit metal undiluted chemistry composition example one (% by mass)
| Numbering | C | Si | Mn | S | P | Cr | Nb |
| FM1+WD1 | 0.018 | 0.24 | 3.76 | 0.001 | 0.004 | 29.02 | 2.12 |
| FM2+WD1 | 0.023 | 0.25 | 3.84 | 0.001 | 0.004 | 29.13 | 2.01 |
| FM3+WD1 | 0.024 | 0.22 | 3.95 | 0.002 | 0.003 | 29.00 | 2.23 |
| Numbering | Al | Ti | Mo | Cu | Co | Fe | Residual material |
| FM1+WD1 | 0.012 | 0.024 | 0.003 | 0.03 | 0.002 | 7.6 | - |
| FM2+WD1 | 0.013 | 0.020 | 0.002 | 0.02 | 0.002 | 7.8 | - |
| FM3+WD1 | 0.020 | 0.032 | 0.003 | 0.03 | 0.002 | 7.9 | - |
Table 6 build-up welding metal undiluted chemical composition example two (% by mass)
It can be seen from tables 5 and 6 that the appropriate component proportion of the flux is combined with the special high-Mn and high-Nb weld zone for surfacing, and the content of harmful elements in the metal components of the surfacing is low. Different welding fluxes are matched with different welding strip products, and the stability is good.
TABLE 7 examples of weld deposit metal Properties
TABLE 8 exemplary surfacing Metal Properties
It can be seen from tables 7 and 8 that the appropriate component proportion of the flux is combined with the special high-Mn and high-Nb weld zone for surfacing, so that the crack sensitivity is reduced, and the crack resistance of the surfacing metal is good.
From the above data, it can be seen that the specially developed fluxes FM1, FM2, FM3 in the examples have low impurity content and good processing performance by using high purity powder and metallurgical control in combination with an excellent manufacturing process. According to the flux components specified in national standards GB/T29713 and NB/T47018-2017, S is less than or equal to 0.035%, P is less than or equal to 0.040%, and the flux component of high-purity powder FM1 is actually adopted: s-0.014, P-0.014, FM 2: s-0.012, P-0.018, FM 3: and S is 0.014, and P is 0.016, which all meet the standard requirements. Two kinds of special welding strips WD1 and WD2 effectively solve the problem of large-thickness surfacing hot cracks of the nuclear power engineering container by increasing the contents of Mn and Nb and controlling the content of S + Si impurities.
From the various indexes and performances tested in the above examples, it can be seen that:
(1) the impurity content of the welding flux in the embodiment is low, harmful impurities brought by raw materials are reduced as much as possible, the S, P content in the welding flux is reduced, and the purity of welding seam metal is ensured. The addition of CaO and ferroalloy further increases the S, P removal effect of the weld deposit metal. The optimal component proportion is found through controlling Mn and Nb alloy elements of the welding strip, the problem of high crack sensitivity of similar products is solved, the technical index of the content of S + Si is provided, the problem of large-thickness hot cracks in engineering application is solved, and other performance indexes are qualified.
(2) By adjusting the melting point and the surface tension of the welding flux, the problems of difficult slag removal, undercut and the like of the submerged arc welding method of the nickel-based material are mainly solved, and the lap joint is good.
(3) The nickel-based submerged arc welding flux produced and manufactured in the embodiment has the advantages of simple process and easy operation, and can realize stable production.
Claims (8)
1. The flux is matched with a nickel-based welding strip with high Mn content and high Nb content and crack resistance, and is characterized in that the flux consists of 25-50 parts of CaF (calcium fluoride) by mass25-20 parts of SiO210-40 parts of Al2O38-20 parts of CaO, 4-15 parts of MgO and Cr2O3Not more than 5 parts, not more than 8 parts of ferroalloy, not more than 0.015 part of S and not more than 0.02 part of P.
2. The flux according to claim 1, wherein the flux comprises 38-45 parts by weight of CaF27-14 parts of SiO212-35 parts of Al2O311-18 parts of CaO, 4-12 parts of MgO and 1-4 parts of Cr2O3Less than or equal to 8 parts of ferroalloy, less than or equal to 0.015 part of S and less than or equal to 0.02 part of P.
3. The welding flux used in combination with the high-Mn high-Nb anti-crack defect nickel-based welding strip as claimed in claim 1, wherein the high-Mn high-Nb anti-crack defect nickel-based welding strip comprises, by weight, C less than or equal to 0.04%, Si less than or equal to 0.50%, Mn less than or equal to 5.0%, S less than or equal to 0.015%, P less than or equal to 0.020%, Cr: 28.0-31.5%, Fe: 7.0 to 12.0 percent of Nb, less than or equal to 2.5 percent of Nb, less than or equal to 0.30 percent of Cu, less than or equal to 0.50 percent of Al, less than or equal to 0.50 percent of Ti, less than or equal to 0.05 percent of Mo, less than or equal to 0.02 percent of Co and the balance of nickel.
4. The flux is matched with a nickel-based welding strip with high Mn content and high Nb content and crack resistance, and is characterized in that the flux consists of 25-50 parts of CaF (calcium fluoride) by mass25-20 parts of SiO210-40 parts of Al2O38-20 parts of CaO, 4-15 parts of MgO and Cr2O3Not more than 5 parts, not more than 5 parts of NaF, not more than 0.015 part of S and not more than 0.02 part of P.
5. The flux according to claim 3, wherein the flux comprises 38-45 parts by weight of CaF27-14 parts of SiO212-35 parts of Al2O311-18 parts of CaO, 4-12 parts of MgO and 1-4 parts of Cr2O3NaF is less than or equal to 5 parts, S is less than or equal to 0.015 part and P is less than or equal to 0.02 part.
6. The welding flux used in combination with the high-Mn high-Nb anti-crack defect nickel-based welding strip as claimed in claim 3, wherein the high-Mn high-Nb anti-crack defect nickel-based welding strip comprises, by weight, C less than or equal to 0.04%, Si less than or equal to 0.50%, Mn less than or equal to 5.0%, S less than or equal to 0.015%, P less than or equal to 0.020%, Cr: 28.0-31.5%, Fe: 7.0 to 12.0 percent of Nb, less than or equal to 2.5 percent of Nb, less than or equal to 0.30 percent of Cu, less than or equal to 0.50 percent of Al, less than or equal to 0.50 percent of Ti, less than or equal to 0.05 percent of Mo, less than or equal to 0.02 percent of Co and the balance of nickel.
7. The method for welding by utilizing the nickel-based welding strip with high Mn and high Nb crack defects and the matched welding flux is characterized in that the nickel-based welding strip with high Mn and high Nb crack defects and the matched welding flux are subjected to surfacing by adopting a strip submerged arc surfacing technology to obtain surfacing metal; wherein the submerged arc welding process parameters are as follows: the welding current is 950-1100A, the welding voltage is 28V, the welding speed is 180mm/min, and the thickness of the overlaying layer is 30 mm.
8. The method for welding by using the nickel-based welding strip with high Mn and high Nb content and the matched flux according to claim 7, which is characterized in that the surfacing metals comprise the following components in parts by weight: less than or equal to 0.30 portion of C, less than or equal to 0.30 portion of Si, 3.5 to 5.0 portions of Mn, less than or equal to 0.003 portion of S, less than or equal to 0.005 portion of P, 28.5 to 31.0 portions of Cr, 7.0 to 8.0 portions of Fe, 1.5 to 2.5 portions of Nb, less than or equal to 0.30 portion of Cu, less than or equal to 0.20 portion of Al, less than or equal to 0.10 portion of Ti, less than or equal to 0.05 portion of Mo, less than or equal to 0.02 portion of Co, and less than or equal to 0.358 portion of.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910949721.XA CN110640355A (en) | 2019-10-08 | 2019-10-08 | Welding flux matched with nickel-based welding strip with high Mn content and high Nb content and capable of preventing crack defects and welding method |
| SE2051133A SE545050C2 (en) | 2019-10-08 | 2020-09-30 | A welding method for a nickel-based welding strip with high mn and nb contents and crack resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910949721.XA CN110640355A (en) | 2019-10-08 | 2019-10-08 | Welding flux matched with nickel-based welding strip with high Mn content and high Nb content and capable of preventing crack defects and welding method |
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| Publication Number | Publication Date |
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| CN110640355A true CN110640355A (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910949721.XA Withdrawn CN110640355A (en) | 2019-10-08 | 2019-10-08 | Welding flux matched with nickel-based welding strip with high Mn content and high Nb content and capable of preventing crack defects and welding method |
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| CN (1) | CN110640355A (en) |
| SE (1) | SE545050C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113319470A (en) * | 2021-06-21 | 2021-08-31 | 中国船舶重工集团公司第七二五研究所 | Bonding flux capable of transferring alloy elements and used for nickel-based welding wire and preparation method thereof |
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| CN105195924A (en) * | 2015-09-25 | 2015-12-30 | 机械科学研究院哈尔滨焊接研究所 | Nickel baseband pole electroslag surfacing sintering flux and preparation method |
| CN105215576A (en) * | 2015-09-22 | 2016-01-06 | 机械科学研究院哈尔滨焊接研究所 | A kind of nickel-base strip pole submerged arc overlay welding sintered flux and manufacture method |
| CN107900557A (en) * | 2017-11-27 | 2018-04-13 | 四川大西洋焊接材料股份有限公司 | 7 strip surfacings of EQNiCrFe, which are matched somebody with somebody, applies mechanically sintered flux and preparation method thereof |
| CN109014658A (en) * | 2018-08-22 | 2018-12-18 | 华中科技大学 | A kind of sintered flux and preparation method thereof for electroslag surfacing rich chromium cast iron |
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| JP5977998B2 (en) * | 2012-05-15 | 2016-08-24 | 株式会社神戸製鋼所 | Ni-base alloy weld metal, strip electrode, and welding method |
| JP6290024B2 (en) * | 2014-07-18 | 2018-03-07 | 株式会社神戸製鋼所 | Tandem submerged arc welding method for high Cr system CSEF steel |
| CN105215571A (en) * | 2015-09-22 | 2016-01-06 | 机械科学研究院哈尔滨焊接研究所 | Add nuclear power NiCrFe alloy welding deposit welding and the welding method of Mn and Nb |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105215576A (en) * | 2015-09-22 | 2016-01-06 | 机械科学研究院哈尔滨焊接研究所 | A kind of nickel-base strip pole submerged arc overlay welding sintered flux and manufacture method |
| CN105195924A (en) * | 2015-09-25 | 2015-12-30 | 机械科学研究院哈尔滨焊接研究所 | Nickel baseband pole electroslag surfacing sintering flux and preparation method |
| CN107900557A (en) * | 2017-11-27 | 2018-04-13 | 四川大西洋焊接材料股份有限公司 | 7 strip surfacings of EQNiCrFe, which are matched somebody with somebody, applies mechanically sintered flux and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113319470A (en) * | 2021-06-21 | 2021-08-31 | 中国船舶重工集团公司第七二五研究所 | Bonding flux capable of transferring alloy elements and used for nickel-based welding wire and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| SE545050C2 (en) | 2023-03-14 |
| SE2051133A1 (en) | 2021-04-09 |
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