CN114055016B - Flux-cored material, seamless flux-cored wire and manufacturing method - Google Patents
Flux-cored material, seamless flux-cored wire and manufacturing method Download PDFInfo
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- CN114055016B CN114055016B CN202111443958.4A CN202111443958A CN114055016B CN 114055016 B CN114055016 B CN 114055016B CN 202111443958 A CN202111443958 A CN 202111443958A CN 114055016 B CN114055016 B CN 114055016B
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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
- B23K35/3608—Titania or titanates
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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
- B23K35/3053—Fe as the principal 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
- B23K35/362—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
- 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
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
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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
- B23K35/40—Making wire or rods for soldering or welding
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Abstract
The invention provides a flux-cored material, a seamless flux-cored wire and a manufacturing method, wherein the flux-cored material comprises the following raw materials in parts by mass: 25-35 parts of rutile, 12-18 parts of atomized iron powder, 20-30 parts of manganese-silicon alloy, 12-18 parts of reduced titanium, 0.5-2 parts of fluoride, 0.2-1 part of Teflon, 1.5-3.5 parts of aluminum powder, 1.5-3.5 parts of aluminum magnesium powder, 3-6 parts of feldspar, 0.5-1 part of high boron iron and 1-3 parts of potassium titanate. The seamless flux-cored wire adopting the flux-cored material avoids air holes through metallurgical reaction during welding, solves the problem of moisture absorption of medicinal powder by adopting a seamless production technology, further improves the air hole resistance of deposited metal, and ensures that a welded joint has good performance.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a flux-cored material, a seamless flux-cored wire and a manufacturing method.
Background
The offshore oil platform is a large and complex welding structure by fixing the steel jacket, the block and the auxiliary structure on the sea bottom through a piling method. The jacket is used as a main bearing structure and has the characteristics of large wall thickness, complex welding nodes, dense welding seams and the like. The wall thickness of the jacket main structure is 50mm-100mm, the welding node form is mainly divided into T type, K type and Y type, the welding operation is often carried out at high altitude, the marine environment is very bad, the wind speed is high, the sea wind is moist, the gas protection is incomplete during welding, the seamed flux-cored wire in the prior art is easy to absorb moisture, and the welding is easy to generate air holes and other defects. The air holes can reduce the effective bearing area of the welded joint, reduce the mechanical property of the welded joint, and the problem of stress concentration can cause instability of the whole welded structure, so that the loss which is difficult to measure is caused. The traditional welding materials are greatly affected by the ambient wind speed, air holes are very easy to appear when the wind speed is more than 8km/h, and a windproof shielding object is needed to be used, but the operation difficulty of workers is increased, so that the welding efficiency is reduced, and a series of problems such as high cost of the welding object are caused. Accordingly, there is a need to provide a flux-cored material and a seamless flux-cored wire and method of manufacture.
Disclosure of Invention
Aiming at the defects and defects in the prior art, the invention provides a flux-cored material, a seamless flux-cored wire and a manufacturing method thereof, so as to solve the problems that the powder of the welding material in the prior art is easy to absorb moisture and poor in air hole resistance.
In order to achieve the above purpose and other related purposes, the invention provides a flux-cored material, which comprises the following raw materials in parts by weight: 25-35 parts of rutile, 12-18 parts of atomized iron powder, 20-30 parts of manganese-silicon alloy, 12-18 parts of reduced titanium, 0.5-2 parts of fluoride, 0.2-1 part of Teflon, 1.5-3.5 parts of aluminum powder, 1.5-3.5 parts of aluminum magnesium powder, 3-6 parts of feldspar, 0.5-1 part of high boron iron and 1-3 parts of potassium titanate.
In an embodiment of the present invention, the fluoride is one or a combination of several of rare earth fluoride, sodium fluoride or calcium fluoride.
In one embodiment of the invention, the rutile is 25-30 parts.
In one embodiment of the invention, the atomized iron powder is 15-18 parts.
In one embodiment of the invention, the reduced titanium is 12-16 parts.
In one embodiment of the invention, the manganese-silicon alloy is 24-28 parts.
In one embodiment of the invention, the fluoride is 1-1.5 parts.
In one embodiment of the invention, the Teflon is 0.2 to 0.8 parts.
In one embodiment of the invention, the aluminum powder is 3-3.5 parts.
In one embodiment of the invention, the aluminum magnesium powder is 1.5-2.4 parts.
In one embodiment of the invention, the feldspar is 5-5.5 parts.
In one embodiment of the invention, the high boron iron is 0.6-1 part.
In one embodiment of the invention, the potassium titanate is 1-2 parts.
In one embodiment of the invention, the rutile has a particle size of 80 mesh.
In one embodiment of the present invention, the atomized iron powder has a particle size of 60 mesh.
In one embodiment of the invention, the manganese silicon alloy has a particle size of 60 mesh.
In one embodiment of the invention, the reduced titanium has a particle size of 80 mesh.
In one embodiment of the invention, the fluoride has a particle size of 80 mesh.
In one embodiment of the invention, the particle size of the teflon is 80 mesh.
In one embodiment of the invention, the aluminum powder has a particle size of 80 mesh.
In one embodiment of the present invention, the particle size of the aluminum magnesium powder is 60 mesh.
In one embodiment of the invention, the feldspar has a particle size of 60 mesh.
In one embodiment of the invention, the granularity of the high boron iron is 60 mesh.
In one embodiment of the invention, the particle size of the potassium titanate is 80 mesh.
The seamless flux-cored wire comprises a steel belt sheath and a flux core, wherein the flux core material is filled in the steel belt sheath, the steel belt is a low-carbon steel belt, and the low-carbon steel belt comprises the following components in percentage by mass based on the total mass of the low-carbon steel belt: c: less than or equal to 0.04 percent, mn:0.10% -0.25%, si: less than or equal to 0.05, S: less than or equal to 0.02, P: less than or equal to 0.02 percent, and the balance of Fe and unavoidable impurities.
In one embodiment of the present invention, the filling factor of the core material is 13% -15%.
In an embodiment of the present invention, there is also provided a method for manufacturing a seamless flux-cored wire, in which a flux core is made of the flux-cored material described in any one of the above, the method for manufacturing a seamless flux-cored wire comprising the steps of:
s1, drying the drug core material for the first time, adding the drug core material into a powder mixer, uniformly mixing and fully stirring, and drying the drug core material for the second time at a set temperature to obtain a drug core material dry powder mixture;
s2, rolling the steel strip into a U-shaped groove;
s3, filling the uniformly mixed drug core material dry powder mixture into the U-shaped groove;
s4, closing the U-shaped groove containing the flux-cored material dry powder mixture, rolling into an O-shape, welding, and drawing to the set diameter of the seamless flux-cored wire.
In an embodiment of the present invention, in step S1, the first drying temperature of rutile and feldspar is 900-950 ℃, and the time of the first drying is 10-12 hours; the first drying temperature of the atomized iron powder, the manganese-silicon alloy, the reduced titanium, the fluoride, the Teflon, the aluminum powder, the aluminum-magnesium powder, the high boron iron and the potassium titanate is 250-350 ℃, and the time of the first drying is 10-15h.
The drug core material has the following functions:
rutile: the main component is TiO2, which is the main slag former. The proper amount of the slag can stabilize welding arc, reduce splashing, improve slag fluidity and facilitate the realization of all-position welding operation; when the addition amount is too small, the characteristics are not obvious; when the addition amount is too much, slag is not easy to remove, and the oxygen content of a welding line can be increased, so that the mechanical property of deposited metal is not facilitated.
Atomized iron powder: as the rest, the arc state is improved and the fluidity of the molten iron is regulated.
Manganese-silicon alloy: mn and Si are used as main deoxidizing elements and alloy transition elements, so that the oxygen content of a welding line is reduced, air holes are reduced, and the deposited metal is kept to have certain strength and toughness. Too little addition can not achieve deoxidization effect, and too much addition causes too high strength and reduced low-temperature impact toughness.
Reduction of titanium: the effect is similar to that of rutile, and a part of rutile can be replaced, so that the manufacturing cost is reduced.
Fluoride: is one or more of sodium fluoride, calcium fluoride or rare earth fluoride, and has the main function of removing hydrogen elements in the welding line. The adding amount is too small, and the effect is not obvious; too much addition can affect arc stability.
Teflon: and the fluorine element is decomposed at high temperature by combining with fluoride, and hydrogen fluoride is formed by the fluorine element and hydrogen element in the welding line, so that the anti-pore performance and the crack resistance of the welding line are improved.
Aluminum powder, aluminum magnesium powder: al and Mg are used as strong deoxidizers, so that the oxygen content of a welding line is reduced, air holes are reduced, and the welding manufacturability can be improved and the impact toughness can be improved by proper addition.
Feldspar: one of the slag formers has the main components of Al2O3 and K2O, na2O, siO, and proper addition can adjust the viscosity of slag and improve the weld joint formation. Too high an addition can raise the oxygen content in the weld and reduce the low temperature impact toughness.
High boron iron: can refine grains and improve the strength and toughness of deposited metal.
Potassium titanate: the arc stabilizer is added to improve the stability of the arc and reduce splashing.
In summary, the invention provides a flux-cored material, a seamless flux-cored wire and a manufacturing method. Wherein, the combined action of Teflon and fluoride can effectively improve the anti-pore performance and the crack resistance of the welding seam. The reduced titanium and the rutile act together, so that the production cost is reduced, the welding arc is stabilized, and the full-position welding operation is realized. The atomized iron powder and the potassium titanate act together, so that the stability of an electric arc can be effectively improved, and the spattering of welding slag is reduced, thereby avoiding the injury of operators. Feldspar can effectively improve weld formation. The oxygen content in the welding seam is reduced by the manganese-silicon alloy, the aluminum powder and the aluminum-magnesium, so that the existence of air holes can be reduced, and the impact toughness is effectively improved. And a certain amount of high boron iron can greatly improve the toughness of deposited metal. The materials interact according to a certain proportion, the metallurgical reaction during welding discharges air hole generating elements, the problem of moisture absorption of medicinal powder is solved by adopting a seamless flux-cored wire technology, and the air hole resistance of deposited metal is further improved, so that the deposited metal has longer storage life.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for manufacturing a seamless flux-cored wire according to an embodiment of the invention;
FIG. 2 is a schematic flow chart of a method for manufacturing a seamless flux-cored wire according to an embodiment of the invention;
FIG. 3 is a schematic flow chart of a method for manufacturing a seamless flux-cored wire according to a second embodiment of the invention;
FIG. 4 is a schematic flow chart of a method for manufacturing a seamless flux-cored wire according to a third embodiment of the invention;
FIG. 5 is a schematic flow chart of a method for manufacturing a seamless flux-cored wire according to a fourth embodiment of the invention;
fig. 6 is a schematic flow chart of a method for manufacturing a seamless flux-cored wire according to a fifth embodiment of the invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The present invention may be practiced or carried out in other embodiments, and the terms such as "upper," "lower," "left," "right," "middle," and "a" or the like, as used in this specification, are merely for descriptive purposes and are not intended to limit the scope of the invention that may be practiced or carried out, but rather are subject to modification or variation of the relative relationship or relationships that is otherwise disclosed without substantial variation of the technical context.
It should be noted that, the illustrations provided in the present embodiment are merely schematic illustrations of the basic concepts of the present invention, and only the components related to the present invention are shown in the illustrations, rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
It should be noted that in the embodiments of the present invention, other unpublished conditions are the same except for the numerical values explicitly given.
The materials of each component in the present invention are selected from the conventional raw materials in the art and are commercially available in general. Preferably, the particle size of rutile selected in all examples described below is 80 mesh, the particle size of the atomized iron powder is 60 mesh, the particle size of the manganese silicon alloy is 60 mesh, the particle size of the reduced titanium is 80 mesh, the particle size of the fluoride is 80 mesh, the particle size of the teflon is 80 mesh, the particle size of the aluminum powder is 80 mesh, the particle size of the aluminum magnesium powder is 60 mesh, the particle size of the feldspar is 60 mesh, the particle size of the high boron iron is 60 mesh, and the particle size of the potassium titanate is 80 mesh.
The drug core material of the invention comprises: 25-35 parts of rutile, 12-18 parts of atomized iron powder, 20-30 parts of manganese-silicon alloy, 12-18 parts of reduced titanium, 0.5-2 parts of fluoride, 0.2-1 part of Teflon, 1.5-3.5 parts of aluminum powder, 1.5-3.5 parts of aluminum magnesium powder, 3-6 parts of feldspar, 0.5-1 part of high boron iron and 1-3 parts of potassium titanate.
The proportions of the above raw materials are different, and different embodiments can be constructed, and specific embodiments are as follows:
example 1
The components of the drug core material are as follows: 35 parts of rutile, 15 parts of atomized iron powder, 20 parts of manganese-silicon alloy, 16 parts of reduced titanium, 0.5 part of fluoride, 0.5 part of Teflon, 1.5 parts of aluminum powder, 2.4 parts of aluminum magnesium powder, 3 parts of feldspar, 0.6 part of high boron iron and 1.8 parts of potassium titanate.
As shown in fig. 2, the method for manufacturing the seamless flux-cored wire by adopting the flux-cored material comprises the following steps:
s11, drying rutile and feldspar for 10 hours at 900 ℃ for the first time, drying other materials for 10 hours at 350 ℃ for the first time, adding the materials into a powder mixer, uniformly mixing and fully stirring, and drying for the second time to obtain a drug core material dry powder mixture;
s12, rolling the steel strip into a U-shaped groove;
s13, filling the uniformly mixed drug core material dry powder mixture into a U-shaped groove;
s14, closing the U-shaped steel belt containing the flux-cored material dry powder mixture to wrap the flux-cored material dry powder mixture therein, and drawing to the set diameter of the seamless flux-cored wire.
Specifically, in step S11, the flux-cored material is required to pass through a 60-80 mesh screen, the screened rutile and feldspar are dried for 10 hours at 900 ℃, other screened powder (atomized iron powder, manganese-silicon alloy, reduced titanium, fluoride, teflon, aluminum powder, aluminum-magnesium powder, high boron iron and potassium titanate) is dried for 10 hours at 350 ℃, the dried flux-cored material is added into a powder mixer to be mixed and fully stirred uniformly, and the mixture is dried for 1 hour at 150 ℃ to obtain a flux-cored material dry powder mixture.
In step S12, the steel strip has a thickness of 1mm and a width of 14mm, and is a low carbon steel strip. And (3) longitudinally shearing the outer skin of the steel belt, winding the steel belt, cleaning the steel belt by using a cleaning solution, and rolling the steel belt into a U-shaped groove. And (3) adding the flux-cored material dry powder mixture obtained in the step (S11) into a U-shaped groove, closing and rolling a steel belt into an O shape, and performing a series of operations such as welding, scar removing, wire drawing reducing, layer winding and the like to obtain the seamless flux-cored wire. Wherein, the filling coefficient of the flux-cored material dry powder mixture in the seamless flux-cored wire (the weight of the flux-cored material dry powder mixture/the total weight of the seamless flux-cored wire) is 13.5 percent.
The seamless flux-cored wire prepared by the embodiment is used for test plate welding, the welding current is 250A, the welding voltage is 28V, and the protective gas is 100 percent CO 2 The wind speed is 9.2km/h, the tensile strength of the welding deposited metal is 557MPa, the yield strength is 465MPa, the elongation is 26%, the impact absorption power at-40 ℃ is 102J, the content of diffused hydrogen is 5.8ml/100g, the X-ray flaw detection result is no air hole, and the evaluation sheet grade is grade I. The seamless flux-cored wire has good air hole resistance.
Example 2
The components of the drug core material are as follows: 30 parts of rutile, 12 parts of atomized iron powder, 26 parts of manganese-silicon alloy, 18 parts of reduced titanium, 1 part of fluoride, 0.5 part of Teflon, 3 parts of aluminum powder, 1.5 parts of aluminum magnesium powder, 5 parts of feldspar, 0.8 part of high boron iron and 1 part of potassium titanate.
As shown in fig. 3, the method for manufacturing the seamless flux-cored wire by adopting the flux-cored material comprises the following steps:
s21, drying rutile and feldspar for 11 hours at 930 ℃ for the first time, drying other materials for 11 hours at 280 ℃, adding the materials into a powder mixer, uniformly mixing and fully stirring, and drying for the second time to obtain a drug core material dry powder mixture;
s22, rolling the steel strip into a U-shaped groove;
s23, filling the uniformly mixed drug core material dry powder mixture into a U-shaped groove;
s24, closing the U-shaped steel belt containing the flux-cored material dry powder mixture to wrap the flux-cored material dry powder mixture therein, and drawing to the set diameter of the seamless flux-cored wire.
Specifically, in step S21, the flux-cored material is required to pass through a 60-80 mesh screen, the screened rutile and feldspar are dried at 930 ℃ for 11 hours, other screened powder (atomized iron powder, manganese-silicon alloy, reduced titanium, fluoride, teflon, aluminum powder, aluminum-magnesium powder, high boron iron and potassium titanate) is dried at 280 ℃ for 11 hours, the dried flux-cored material is added into a powder mixer to be mixed and fully stirred uniformly, and the mixture is dried at 150 ℃ for 1.2 hours to obtain a flux-cored material dry powder mixture.
In step S22, the steel strip was 1.0mm thick, 14mm wide, and low carbon steel strip. And (3) longitudinally shearing the outer skin of the steel belt, winding the steel belt, cleaning the steel belt by using a cleaning solution, and rolling the steel belt into a U-shaped groove. And (3) adding the flux-cored material dry powder mixture obtained in the step (S21) into a U-shaped groove, closing and rolling a steel belt into an O shape, and performing a series of operations such as welding, scar removing, wire drawing reducing, layer winding and the like to obtain the seamless flux-cored wire. Wherein, the filling coefficient of the flux-cored material dry powder mixture in the seamless flux-cored wire (the weight of the flux-cored material dry powder mixture/the total weight of the seamless flux-cored wire) is 13.9 percent.
The seamless flux-cored wire prepared by the embodiment is used for test plate welding, the welding current is 250A, the welding voltage is 28V, and the protective gas is 100 percent CO 2 The wind speed is 9.3km/h, the tensile strength of the welding deposited metal is 552MPa, the yield strength is 460MPa, the elongation is 26.5%, the impact absorption power at-40 ℃ is 106J, the content of diffused hydrogen is 5.6ml/100g, the X-ray flaw detection result is no air hole, and the evaluation grade is grade I. The seamless flux-cored wire has good air hole resistance.
Example 3
The components of the drug core material are as follows: 27 parts of rutile, 18 parts of atomized iron powder, 28 parts of manganese-silicon alloy, 14 parts of reduced titanium, 1.2 parts of fluoride, 1 part of Teflon, 3.2 parts of aluminum powder, 3 parts of aluminum-magnesium powder, 5.5 parts of feldspar, 0.5 part of high boron iron and 3 parts of potassium titanate.
As shown in fig. 4, the method for manufacturing the seamless flux-cored wire by adopting the flux-cored material comprises the following steps:
s31, drying rutile and feldspar for 12 hours at 950 ℃ for the first time, drying other materials for 12 hours at 250 ℃, adding the materials into a powder mixer, uniformly mixing and fully stirring, and drying for the second time to obtain a drug core material dry powder mixture;
s32, rolling the steel strip into a U-shaped groove;
s33, filling the uniformly mixed drug core material dry powder mixture into a U-shaped groove;
s34, closing the U-shaped steel belt containing the flux-cored material dry powder mixture to wrap the flux-cored material dry powder mixture therein, and drawing to the set diameter of the seamless flux-cored wire.
Specifically, in step S31, the flux-cored material is required to pass through a 60-80 mesh screen, the screened rutile and feldspar are dried for 12 hours at 950 ℃, other screened powder (atomized iron powder, manganese-silicon alloy, reduced titanium, fluoride, teflon, aluminum powder, aluminum-magnesium powder, high boron iron and potassium titanate) is dried for 12 hours at 250 ℃, the dried flux-cored material is added into a powder mixer to be mixed and fully stirred uniformly, and the mixture is dried for 1.4 hours at 150 ℃ to obtain a flux-cored material dry powder mixture.
In step S32, the steel strip has a thickness of 1.0mm and a width of 14mm, and is a low carbon steel strip. And (3) longitudinally shearing the outer skin of the steel belt, winding the steel belt, cleaning the steel belt by using a cleaning solution, and rolling the steel belt into a U-shaped groove. And (3) adding the flux-cored material dry powder mixture obtained in the step (S31) into a U-shaped groove, closing and rolling a steel belt into an O shape, and performing a series of operations such as welding, scar removing, wire drawing reducing, layer winding and the like to obtain the seamless flux-cored wire. Wherein, the filling coefficient of the flux-cored material dry powder mixture in the seamless flux-cored wire (the weight of the flux-cored material dry powder mixture/the total weight of the seamless flux-cored wire) is 15 percent.
The seamless flux-cored wire prepared by the embodiment is used for test plate welding, the welding current is 250A, the welding voltage is 28V, and the protective gas is 100 percent CO 2 The wind speed is 9.5km/h, the tensile strength of the welding deposited metal is 550MPa, the yield strength is 462MPa, the elongation is 26%, the impact absorption power is 103J at the temperature of minus 40 ℃, the content of diffused hydrogen is 5.6ml/100g, the X-ray flaw detection result is no air hole, and the evaluation sheet grade is grade I. The seamless flux-cored wire has good air hole resistance.
Example 4
The components of the drug core material are as follows: 25 parts of rutile, 17 parts of atomized iron powder, 24 parts of manganese-silicon alloy, 18 parts of reduced titanium, 1.5 parts of fluoride, 0.2 part of Teflon, 2 parts of aluminum powder, 3.5 parts of aluminum-magnesium powder, 6 parts of feldspar, 0.8 part of high boron iron and 2 parts of potassium titanate.
As shown in fig. 5, the method for manufacturing the seamless flux-cored wire by adopting the flux-cored material comprises the following steps:
s41, drying rutile and feldspar for 13 hours at 950 ℃ for the first time, drying other materials for 13 hours at 280 ℃ for the first time, adding the materials into a powder mixer, uniformly mixing and fully stirring, and drying for the second time to obtain a drug core material dry powder mixture;
s42, rolling the steel strip into a U-shaped groove;
s43, filling the uniformly mixed drug core material dry powder mixture into a U-shaped groove;
s44, closing the U-shaped steel belt containing the flux-cored material dry powder mixture to wrap the flux-cored material dry powder mixture therein, and drawing to the set diameter of the seamless flux-cored wire.
Specifically, in step S41, the flux-cored material is required to pass through a 60-80 mesh screen, the screened rutile and feldspar are dried at 950 ℃ for 13 hours, other screened powder (atomized iron powder, manganese-silicon alloy, reduced titanium, fluoride, teflon, aluminum powder, aluminum-magnesium powder, high boron iron and potassium titanate) is dried at 280 ℃ for 13 hours, the dried flux-cored material is added into a powder mixer to be mixed and fully stirred uniformly, and the mixture is dried at 150 ℃ for 1.6 hours to obtain a flux-cored material dry powder mixture.
In step S42, the steel strip has a thickness of 1.0mm and a width of 14mm, and is a low carbon steel strip. And (3) longitudinally shearing the outer skin of the steel belt, winding the steel belt, cleaning the steel belt by using a cleaning solution, and rolling the steel belt into a U-shaped groove. And (2) adding the flux-cored material dry powder mixture obtained in the step (S41) into a U-shaped groove, closing and rolling a steel belt into an O shape, and performing a series of operations such as welding, scar removing, wire drawing reducing, layer winding and the like to obtain the seamless flux-cored wire. Wherein, the filling coefficient of the flux-cored material dry powder mixture in the seamless flux-cored wire (the weight of the flux-cored material dry powder mixture/the total weight of the seamless flux-cored wire) is 13 percent.
The seamless flux-cored wire prepared by the embodiment is used for test plate welding, the welding current is 250A, the welding voltage is 28V, and the protective gas is 100 percent CO 2 The wind speed is 9.3km/h, the tensile strength of the welding deposited metal is 559MPa, the yield strength is 465MPa, the elongation is 27%, the impact absorption power is 113J at the temperature of minus 40 ℃, the content of diffused hydrogen is 5.5ml/100g, the X-ray flaw detection result is no air hole, and the evaluation sheet grade is grade I. The seamless flux-cored wire has good air hole resistance.
Example 5
The components of the drug core material are as follows: 34 parts of rutile, 15 parts of atomized iron powder, 30 parts of manganese-silicon alloy, 12 parts of reduced titanium, 2 parts of fluoride, 0.8 part of Teflon, 3.5 parts of aluminum powder, 1.8 parts of aluminum magnesium powder, 5.4 parts of feldspar, 1 part of high boron iron and 2.8 parts of potassium titanate.
As shown in fig. 6, the method for manufacturing the seamless flux-cored wire by adopting the flux-cored material comprises the following steps:
s51, drying rutile and feldspar for 15 hours at 950 ℃ for the first time, drying other materials for 15 hours at 280 ℃ for the first time, adding the materials into a powder mixer, uniformly mixing and fully stirring, and drying for the second time to obtain a drug core material dry powder mixture;
s52, rolling the steel strip into a U-shaped groove;
s53, filling the uniformly mixed drug core material dry powder mixture into a U-shaped groove;
s54, closing the U-shaped steel belt containing the flux-cored material dry powder mixture to wrap the flux-cored material dry powder mixture therein, and drawing to the set diameter of the seamless flux-cored wire.
Specifically, in step S51, the drug core material is required to pass through a 60-80 mesh screen, the screened rutile and feldspar are dried for 15 hours at 950 ℃, other screened powder is dried for 15 hours at 280 ℃, the dried drug core material is added into a powder mixer to be mixed and fully stirred uniformly, and the mixture is dried for 2 hours at 150 ℃ to obtain the drug core material dry powder mixture.
In step S52, the steel strip has a thickness of 1.0mm and a width of 14mm, and is a low carbon steel strip. And (3) longitudinally shearing the outer skin of the steel belt, winding the steel belt, cleaning the steel belt by using a cleaning solution, and rolling the steel belt into a U-shaped groove. And (3) adding the flux-cored material dry powder mixture obtained in the step (S51) into a U-shaped groove, closing and rolling a steel belt into an O shape, and performing a series of operations such as welding, scar removing, wire drawing reducing, layer winding and the like to obtain the seamless flux-cored wire. Wherein, the filling coefficient of the flux-cored material dry powder mixture in the seamless flux-cored wire (the weight of the flux-cored material dry powder mixture/the total weight of the seamless flux-cored wire) is 13.6 percent.
The seamless flux-cored wire prepared by the embodiment is used for test plate welding, the welding current is 250A, the welding voltage is 28V, and the protective gas is 100 percent CO 2 The wind speed is 9.5km/h, the tensile strength of the welding deposited metal is 553MPa, the yield strength is 459MPa, the elongation is 26.5%, the impact absorption power at-40 ℃ is 105J, the content of diffused hydrogen is 5.3ml/100g, the X-ray flaw detection result is no air hole, and the evaluation grade is grade I. The seamless flux-cored wire has good air hole resistance.
Comparative example 1
The components of the drug core material are as follows: 30 parts of rutile, 12 parts of atomized iron powder, 26 parts of manganese-silicon alloy, 18 parts of reduced titanium, 1 part of fluoride, 3 parts of aluminum powder, 1.5 parts of aluminum-magnesium powder, 5 parts of feldspar, 0.8 part of high boron iron and 1 part of potassium titanate.
The method for manufacturing the seamless flux-cored wire by adopting the flux-cored material is the same as that of the embodiment 2.
The seamless flux-cored wire prepared by the embodiment is used for test plate welding, the welding current is 250A, the welding voltage is 28V, and the protective gas is 100 percent CO 2 The wind speed is 9.2km/h, the tensile strength of the welding deposited metal is 554MPa, the yield strength is 461MPa, the elongation is 26.5%, the impact absorption power is 93J at minus 40 ℃, the content of diffused hydrogen is 7.6ml/100g, 8 air holes appear in an X-ray flaw detection result, and the grade of an evaluation sheet is grade II. Thus, the seamless flux-cored wire has poor resistance to air holes when Teflon is not used.
Comparative example 2
The components of the drug core material are as follows: 25 parts of rutile, 17 parts of atomized iron powder, 24 parts of manganese-silicon alloy, 18 parts of reduced titanium, 1.5 parts of fluoride, 2 parts of aluminum powder, 3.5 parts of aluminum-magnesium powder, 6 parts of feldspar, 0.8 part of high boron iron and 2 parts of potassium titanate.
The method for manufacturing the seamless flux-cored wire by using the flux-cored material is the same as that of example 4.
The seamless flux-cored wire prepared by the embodiment is used for test plate welding, the welding current is 250A, the welding voltage is 28V, and the protective gas is 100 percent CO 2 The wind speed is 9.5km/h, the tensile strength of the welding deposited metal is 540MPa, the yield strength is 453MPa, the elongation is 26.0%, the impact absorption power at-40 ℃ is 87J, the content of diffused hydrogen is 7.3ml/100g, 6 air holes appear in an X-ray flaw detection result, and the evaluation grade is grade II. Thus, the seamless flux-cored wire has poor resistance to air holes when Teflon is not used.
In conclusion, as the marine welding environment has more severe technological requirements, the general welding materials are difficult to meet the requirements of marine welding. In order to improve the anti-pore capability of the flux-cored wire and avoid pores in welding seams, the flux-cored wire adopts raw materials such as manganese-silicon alloy, aluminum powder, aluminum-magnesium powder, fluoride, teflon and the like with different proportions, and Mn-Si-Al-Mg reacts with oxygen elements to become oxides, so that the deoxidization function is realized. The fluoride and the Teflon are combined to react with hydrogen element to become fluoride, so that the dehydrogenation function is realized. Thereby reducing the oxygen and hydrogen contents in the welding line. In addition, the existence of Al can also reduce the influence of nitrogen element on deposited metal in the welding process, and the raw materials of the components are used in the flux-cored material, so that the element which can generate pores can be discharged through metallurgical reaction in the welding process of the welding wire, and the pore resistance of the deposited metal is effectively improved. The manufacturing of the flux-cored wire adopts a seamless manufacturing technology, and prevents external moisture from entering the interior of the welding wire from gaps during storage and use. Compared with the common seamed flux-cored wire, the problem of moisture absorption of the powder is solved, and the pore resistance of deposited metal is further improved by matching with each component of the flux-cored wire, so that the deposited metal has longer storage life. In addition, the flux-cored material in the application also solves the problem of welding air hole defects of the jacket in a severe marine environment. Therefore, the requirements of resisting air hole performance in the ocean engineering TKY jacket welding process can be met, the welding joint is ensured to have good performance, and the service life of an ocean platform is prolonged. Therefore, the invention has high utilization value and use significance.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. The drug core material is characterized by comprising the following raw materials in parts by weight: 25-30 parts of rutile, 12-18 parts of atomized iron powder, 20-30 parts of manganese-silicon alloy, 12-18 parts of reduced titanium, 0.5-2 parts of fluoride, 0.2-1 part of Teflon, 1.5-3.5 parts of aluminum powder, 1.5-3.5 parts of aluminum magnesium powder, 3-6 parts of feldspar, 0.5-1 part of high boron iron and 1-3 parts of potassium titanate.
2. The drug core material of claim 1, wherein the fluoride is one or a combination of rare earth fluoride, sodium fluoride or calcium fluoride.
3. The core material of claim 1, wherein the atomized iron powder is 15-18 parts.
4. The core material of claim 1, wherein the reduced titanium is 12-16 parts.
5. The core material of claim 1, wherein the manganese silicon alloy is 24-28 parts.
6. A seamless flux-cored wire comprising a steel strip sheath and a flux core, the flux core being the flux core material according to any one of claims 1 to 5, the flux core material being filled in the steel strip sheath, characterized in that the steel strip is a low carbon steel strip comprising the following components in percentage by mass, based on the total mass of the low carbon steel strip: c: less than or equal to 0.04 percent, mn:0.10% -0.25%, si: less than or equal to 0.05, S:
less than or equal to 0.02, P: less than or equal to 0.02 percent, and the balance of Fe and unavoidable impurities.
7. The seamless flux-cored wire of claim 6, wherein the flux-cored material has a fill factor of 13% -15%.
8. A method for manufacturing a seamless flux-cored wire, characterized in that a flux core in the seamless flux-cored wire is made of the flux-cored material according to any one of claims 1 to 5, and the method for manufacturing the seamless flux-cored wire comprises the following steps:
s1, drying the drug core material for the first time, adding the drug core material into a powder mixer, uniformly mixing and fully stirring, and drying the drug core material for the second time at a set temperature to obtain a drug core material dry powder mixture;
s2, rolling the steel strip into a U-shaped groove;
s3, filling the uniformly mixed drug core material dry powder mixture into the U-shaped groove;
s4, closing the U-shaped groove containing the flux-cored material dry powder mixture, rolling into an O-shape, welding, and drawing to the set diameter of the seamless flux-cored wire.
9. The method for manufacturing a seamless flux-cored wire according to claim 8, wherein in the step S1, the first drying temperature of rutile and feldspar is 900-950 ℃, and the time of the first drying is 10-12 hours; the first drying temperature of the atomized iron powder, the manganese-silicon alloy, the reduced titanium, the fluoride, the Teflon, the aluminum powder, the aluminum-magnesium powder, the high boron iron and the potassium titanate is 250-350 ℃, and the time of the first drying is 10-15h.
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| CN115815881B (en) * | 2022-12-09 | 2024-08-09 | 山东聚力焊接材料有限公司 | Flux-cored material for welding arm support of intelligent high-altitude platform operation vehicle, welding wire containing flux-cored material and preparation method of flux-cored material |
| CN116060829A (en) * | 2023-03-15 | 2023-05-05 | 山东聚力焊接材料有限公司 | Seamless flux-cored wire for polar region ship steel and preparation method thereof |
| CN118106660B (en) * | 2024-04-30 | 2024-07-05 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | Manufacturing method of 460 MPa-level steel flux-cored wire for ships and maritime work |
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| US10300565B2 (en) * | 2014-10-17 | 2019-05-28 | Hobart Brothers Company | Systems and methods for welding mill scaled workpieces |
| CN109623193B (en) * | 2018-12-26 | 2021-02-09 | 中国船舶重工集团公司第七二五研究所 | Low-hydrogen high-toughness seamless flux-cored wire for low-temperature steel and preparation method thereof |
| CN110539105B (en) * | 2019-09-27 | 2021-12-24 | 常州长海焊材有限公司 | Flux-cored wire |
| CN110625298B (en) * | 2019-11-06 | 2021-07-27 | 山东聚力焊接材料有限公司 | Welding wire flux-cored material with crack resistance and air hole resistance, welding wire and preparation method thereof |
| CN112917044B (en) * | 2021-02-03 | 2022-09-06 | 武汉铁锚焊接材料股份有限公司 | 550 MPa-level flux-cored wire with excellent moisture resistance |
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