An acid core wire and a method of manufacturing and using the same

Abstract

The application provides an acid core wire and a preparation method and application thereof, and particularly relates to the technical field of welding materials. The core wire comprises a steel belt sheath and a core filled in the steel belt sheath. The core comprises the following components in percentage of mass: 35-50% of rutile, 2.5-5% of zircon sand, 2.5-5% of potassium feldspar, 1.5-3% of potassium fluozirconate, 1.5-3% of quartz, 15-20% of metallic manganese, 3-5% of ferrosilicon, 15-20% of nickel powder, 1-2% of cobalt powder, 1-2% of molybdenum powder, 1-2% of aluminum-zirconium alloy, 1.5-3.5% of magnesium powder, 1-2% of perovskite, and the rest is atomized iron powder. The acid core wire has good welding process, good arc stability, less spatter, good appearance of weld formation, good deslagging property, high deposition rate and deposition rate, and the weld has the characteristics of high strength, high low-temperature impact toughness and corrosion resistance, and can meet the use requirement of high-strength Q690 rack steel.

Description

Technical Field

[0001] This invention relates to the field of welding materials technology, specifically to an acidic flux-cored welding wire, its preparation method, and its application. Background Technology

[0002] High-strength steels such as Q345, Q390, Q420, Q460, Q620, and Q690 are commonly used in industries such as steel structure construction, pressure vessels, bridges, shipbuilding, and marine engineering. Among these, Q690 high-strength steel is frequently used in marine cranes, marine liquid tanks, jack-up offshore platform legs, and coal mine hydraulic supports. The rack and pinion components used in the construction of jack-up offshore platforms for oil and gas extraction in cold waters require high strength, good toughness, and plasticity. Due to the safety and reliability requirements of the application environment for Q690 rack steel, higher demands are placed on the quality and performance stability of the welding materials used in its production.

[0003] As the thickness of rack steel increases, the types and contents of alloy components also increase. Adding more complex alloys achieves strength and toughness, ultimately ensuring the uniformity and stability of the performance of thick-walled rack steel. However, this also reduces the material's weldability. Currently, the largest reported thickness of rack steel, both domestically and internationally, reaches 180mm, and some steel mills in China have already completed research and development. However, there are still no suitable welding materials. Therefore, developing a welding wire specifically for 690M high-strength rack steel is particularly important. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides an acidic flux-cored welding wire, its preparation method and application, so as to improve the problem that the existing flux-cored welding wire cannot meet the welding requirements of thick high-strength steel.

[0005] To achieve the above and other related objectives, the present invention provides an acidic flux-cored welding wire, which includes a steel strip outer sheath and a flux core filled within the steel strip outer sheath. The flux core comprises the following components by mass percentage: 35-50% rutile, 2.5-5% zircon sand, 2.5-5% potassium feldspar, 1.5-3% potassium fluorozirconate, 1.5-3% quartz, 15-20% metallic manganese, 3-5% ferrosilicon, 15-20% nickel powder, 1-2% cobalt powder, 1-2% molybdenum powder, 1-2% aluminum-zirconium alloy, 1.5-3.5% magnesium powder, 1-2% perovskite, and the balance being atomized iron powder.

[0006] In one embodiment of the present invention, the steel strip outer sheath contains less than or equal to 0.01% carbon, less than or equal to 0.02% silicon, less than or equal to 0.008% phosphorus, less than or equal to 0.008% sulfur, and 0.1-0.25% manganese.

[0007] In one embodiment of the present invention, the rutile contains titanium dioxide (TiO2) with a mass content greater than or equal to 95%; the zircon sand contains zirconium dioxide (ZrO2) with a mass content greater than or equal to 66% and silicon dioxide (SiO2) with a mass content less than or equal to 32%; the potassium feldspar contains SiO2 with a mass content of 63-73% and alumina (Al2O3) with a mass content of 15-22%; the potassium fluorozirconate (K2ZrF6) has a purity greater than or equal to 99%; the quartz contains SiO2 with a mass content greater than or equal to 97%; the manganese metal contains Mn with a mass content greater than or equal to 99%; and the ferrosilicon contains silicon (SiO2) with a mass content of 95%. The mass content of the following components is as follows: 42-47%; 99% or more of nickel (Ni) in the nickel powder; 98% or more of cobalt (Co) in the cobalt powder; 95% or more of molybdenum (Mo) in the molybdenum powder; 14-18% of aluminum (Al) in the aluminum-zirconium alloy, with impurities less than 1.5% and the balance being zirconium (Zr); 38-43% of calcium oxide (CaO) and 56-62% of TiO2 in the perovskite; 98% or more of magnesium (Mg) in the magnesium powder; and 99% or more of iron in the atomized iron powder.

[0008] In one embodiment of the present invention, the particle size of each component in the core is 60-80 mesh.

[0009] In one embodiment of the present invention, the mass of the flux core accounts for 19-21% of the total mass of the acid flux-cored welding wire.

[0010] In one embodiment of the present invention, the outer sheath of the steel strip is selected from HS1 steel strip.

[0011] In one embodiment of the present invention, the diameter of the acidic flux-cored welding wire is 1.2~1.6mm.

[0012] Another aspect of the present invention provides a method for preparing an acidic flux-cored welding wire, the method comprising the following steps:

[0013] Weigh each component according to the above proportions and dry each component.

[0014] The dried components are mixed evenly to obtain the core.

[0015] The steel strip is rolled into a U-shaped groove, and the core is filled into the U-shaped groove and closed.

[0016] The steel strip filled with the flux core is drawn and reduced to a preset diameter to obtain an acid flux-cored welding wire.

[0017] In one embodiment of the present invention, the drying treatment of each component includes: holding potassium fluorozirconate, metallic manganese, ferrosilicon, nickel powder, cobalt powder, molybdenum powder, aluminum zirconium alloy, magnesium powder, and atomized iron powder at a temperature of 150~170°C for 120 minutes; and holding quartz, rutile, zircon sand, perovskite, and potassium feldspar at a temperature of 850°C for 360 minutes.

[0018] The present invention also provides an application of an acidic flux-cored welding wire, which is used for welding high-strength Q690 rack steel.

[0019] The acidic flux-cored welding wire of this invention adjusts the content of elements such as Al, Ti, and Mo in the weld by regulating the composition of the flux core, thereby refining the grains to a size of less than or equal to 30 μm. This results in high yield strength and tensile strength, high fracture toughness, and excellent welding performance. Appropriate adjustment of the Co and Ni ratio in the weld promotes Fe... Co Ni high-entropy alloy structure, Fe Co The Ni high-entropy alloy structure, due to its excellent wear resistance and corrosion resistance, enables the welding material to adapt to the harsh operating environment of high-strength steel. In addition, by strictly controlling the content of harmful elements such as sulfur and phosphorus in the outer skin of the steel strip, the brittleness of the deposited metal is reduced.

[0020] The acidic flux-cored welding wire of the present invention has good welding processability, good arc stability, less spatter, beautiful weld formation, good slag removal, and high deposition rate and deposition speed; the deposited metal has the characteristics of high strength, high and low temperature impact toughness, and corrosion resistance. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic flowchart of one embodiment of the method for preparing the acidic flux-cored welding wire of the present invention. Detailed Implementation

[0023] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0025] In this document, when numerical ranges are mentioned, unless otherwise specified, the distribution of selectable values ​​within a numerical range is considered continuous, including the two endpoints of the range (i.e., the minimum and maximum values), and every value between these two endpoints. When multiple numerical ranges are provided to describe a feature or property, these numerical ranges can be combined.

[0026] It should be noted that, unless otherwise specified, "%" and "wt%" in this article both represent mass percentages.

[0027] This invention provides an acidic flux-cored welding wire, its preparation method, and its application. By adjusting the flux-cored components in the welding wire and adjusting elements such as Al, Ti, Mo, Co, and Ni in the weld, the weld metal after welding has higher yield and tensile strength, as well as better wear resistance and corrosion resistance, making the welding material suitable for the harsh operating environment of high-strength steel.

[0028] The first aspect of this invention provides an acidic flux-cored welding wire, comprising a steel strip sheath and a flux core filled within the steel strip sheath. The flux core comprises the following components by mass percentage: 35-50% rutile, 2.5-5% zircon sand, 2.5-5% potassium feldspar, 1.5-3% potassium fluorozirconate, 1.5-3% quartz, 15-20% metallic manganese, 3-5% ferrosilicon, 15-20% nickel powder, 1-2% cobalt powder, 1-2% molybdenum powder, 1-2% aluminum-zirconium alloy, 1.5-3.5% magnesium powder, 1-2% perovskite, with the balance being atomized iron powder. The sum of the mass percentages of all components is 100%.

[0029] The functions of each component in the above-mentioned core are detailed below:

[0030] Rutile: Its main component is TiO2, and the rutile used in this invention has a TiO2 content of ≥95%. Rutile can stabilize the electric arc, reduce spatter, and when combined with other slag-forming agents, it can improve slag removal, reduce weld segregation, and play a role in solid solution strengthening. The rutile content in the flux core of the welding wire of this invention can be any value between 35% and 50%, for example, 35%, 40%, 45%, or 50%, etc.

[0031] Zircon sand: The main components of zircon sand are ZrO2 and SiO2. The zircon sand used in this invention has a ZrO2 content ≥66% and a SiO2 content ≤32%. Zircon sand mainly plays a role in slag formation and adjusting the molten slag. Adding an appropriate amount of zircon sand to the flux core can reduce the droplet size and improve the all-position welding process of the welding wire. The zircon sand content in the flux core of the welding wire of this invention can be any value from 2.5% to 5%, for example, 2.5%, 3.5%, or 5%, etc.

[0032] Potassium feldspar: Its main components are SiO2, Al2O3, and K2O, with SiO2 content ranging from 63% to 73%, Al2O3 content ranging from 15% to 22%, and the remainder being K2O and a small amount of impurities. The main function of potassium feldspar is to stabilize the arc and increase the fluidity of the molten slag. The potassium feldspar content in the flux core of the welding wire of this invention can be any value between 2.5% and 5%, for example, 2.5%, 3.5%, or 5%, etc.

[0033] Potassium fluorozirconate: The content (purity) of K2ZrF6 is ≥99%. Adding an appropriate amount of potassium fluorozirconate to the flux core can improve the stability of the welding arc, reduce the surface tension of the slag, refine the droplets, and reduce spatter. However, adding too much will increase spatter. The mass content of potassium fluorozirconate in the flux core of the welding wire of this invention can be any value between 1.5% and 3%, such as 1.5%, 2%, or 3%.

[0034] Quartz: Its main component is SiO2, which is mainly used for slag formation and arc stabilization. It can adjust the melting point and surface tension of the welding slag. Appropriate addition can increase the activity of the slag and adjust the melting point and viscosity of the molten slag. The mass content of quartz in the flux core of the welding wire of this invention can be any value between 1.5% and 3%, such as 1.5%, 2%, or 3%.

[0035] Metallic manganese: Primarily used as a deoxidizer, alloying agent, and desulfurizer. The metallic manganese used in this invention has a purity ≥99%. The mass content of metallic manganese in the core can be any value between 15% and 20%, for example, 15%, 18%, or 20%, etc.

[0036] Ferrosilicon: also known as ferrosilicon alloy, it mainly functions as a deoxidizer and alloying agent. Si, as an alloying element, has a solid solution strengthening effect on the weld metal; however, excessive Si content can increase spatter and reduce toughness. This invention uses 45% ferrosilicon, wherein the Si content is 42-47% by mass, with the balance being Fe and a small amount of impurities. In some embodiments, the ferrosilicon content in the flux core can be any value between 3% and 5%, for example, 3%, 4%, or 5%, etc.

[0037] Nickel powder, with a purity ≥99%, is used. Ni can be infinitely dissolved in austenite, providing solid solution strengthening and refining grains. It also lowers the ductile-brittle transition temperature of the weld metal. Under certain conditions, the strength increases with increasing nickel content, and low-temperature impact toughness is significantly improved. Nickel also exhibits high resistance to acid and alkali corrosion and provides rust prevention and heat resistance at high temperatures. However, excessive nickel content increases the tendency for hot cracking in the weld metal. The nickel powder content in the flux core of the welding wire of this invention can be selected from any value between 15% and 20%, for example, 15%, 17%, or 20%, etc.

[0038] Cobalt powder: purity ≥98%, its main function is to transfer cobalt element into the weld. Cobalt itself has corrosion resistance, is a solid solution matrix, and can ensure that the deposited metal has a certain toughness. In the flux core of the welding wire of this invention, the mass content of cobalt powder can be selected from any value between 1% and 2%, for example, it can be 1%, 1.5%, or 2%, etc.

[0039] Molybdenum powder: purity ≥95%. Its main function is to introduce alloying elements into the weld metal. Molybdenum can improve the hardening performance of the weld metal, as well as its corrosion resistance, grain refinement, and hardenability of the steel. The molybdenum content in the flux core of the welding wire of this invention can be any value between 1% and 2%, for example, 1%, 1.5%, or 2%.

[0040] Aluminum-zirconium alloy: mainly used for deoxidation and denitrification. The aluminum-zirconium alloy used in this application has an Al content of 14-18% by mass, an impurity content of less than 1.5%, and the balance being Zr. Al effectively reduces the sensitivity of weld porosity, primarily due to its strong deoxidizing ability. Furthermore, aluminum has a strong bonding force with nitrogen, forming stable nitrides that are insoluble in the weld metal but melt in the slag. A certain amount of aluminum ensures resistance to porosity. The aluminum-zirconium alloy content in the flux core of the welding wire of this invention can be any value between 1% and 2%, for example, 1%, 1.5%, or 2%, etc.

[0041] Magnesium powder: purity ≥98%, mainly used as a deoxidizer and desulfurizer, which can effectively reduce the impurity content of the deposited metal. The oxidation product MgO can adjust the basicity of the slag and improve the low-temperature toughness of the deposited metal.

[0042] Perovskite, mainly composed of CaO and TiO2, with CaO content ranging from 38% to 43% and TiO2 content from 56% to 62%. The main functions of perovskite are slag formation and arc stabilization. The perovskite content in the flux core of the welding wire of this invention can be any value between 1% and 2%, for example, 1%, 1.5%, or 2%.

[0043] Atomized iron powder: purity ≥99%. Adding a certain amount of iron powder to the core can accelerate the melting speed of the coating and improve the application efficiency.

[0044] Studies have found that the particle size of each component in the flux core also affects its welding effect. In some embodiments, the particle size of each component in the flux core is 60-80 mesh, for example, 60 mesh, 70 mesh, or 80 mesh, etc. The particle size mentioned above refers to the size of the raw material particles; the larger the mesh number, the finer the particles.

[0045] In one embodiment, the steel strip outer sheath contains less than or equal to 0.01% carbon, less than or equal to 0.02% silicon, less than or equal to 0.008% phosphorus, less than or equal to 0.008% sulfur, and 0.1-0.25% manganese by mass. Further, the steel strip outer sheath is made of HS1 steel strip. Using steel strip with low content of harmful elements such as sulfur and phosphorus can reduce the brittleness of the deposited metal.

[0046] In some embodiments, the diameter of the flux-cored wire is 1.2 to 1.6 mm. For example, the diameter of the flux-cored wire can be 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or 1.6 mm, etc.

[0047] In one embodiment, the amount of flux filling in the acid flux-cored wire accounts for 19-21% of the total mass of the flux-cored wire, for example, 19%, 20% or 21%, etc.

[0048] Please see Figure 1 The second aspect of the present invention provides a method for preparing an acidic flux-cored welding wire, the method comprising the following steps:

[0049] S1. Weigh each component according to the ratio and dry each component.

[0050] S2. Mix the dried components evenly to obtain the core.

[0051] S3. Roll the steel strip into a U-shaped groove and fill the core into the U-shaped groove to close it;

[0052] S4. The steel strip filled with flux is drawn and reduced to a preset diameter to obtain an acid flux-cored welding wire.

[0053] Specifically, the powder formulation in step S1 is as follows: rutile 35-50%, zircon sand 2.5-5%, potassium feldspar 2.5-5%, potassium fluorozirconate 1.5-3%, quartz 1.5-3%, metallic manganese 15-20%, ferrosilicon 3-5%, nickel powder 15-20%, cobalt powder 1-2%, molybdenum powder 1-2%, aluminum-zirconium alloy 1-2%, magnesium powder 1.5-3.5%, perovskite 1-2%, and the balance being atomized iron powder. The purity requirements for each component are detailed above and will not be repeated here.

[0054] The method of drying each component in step S1 is not limited, as long as the components can be dried. For example: potassium fluorozirconate, metallic manganese, ferrosilicon, nickel powder, cobalt powder, molybdenum powder, aluminum-zirconium alloy, magnesium powder, and atomized iron powder are kept at 150~170℃ for 120 minutes; quartz, rutile, zircon sand, perovskite, and potassium feldspar are kept at 850℃ for 360 minutes.

[0055] Step S2 involves mixing and stirring the components weighed in step S1 until homogeneous, thus obtaining the drug core. The mixing method in this step is not limited; any method that ensures the drug powder is mixed evenly can be used. In one example, a rotary mixing pot is used, with continuous stirring for at least 30 minutes until the drug powder is evenly mixed. In another example, a powder mixer can also be used, and so on.

[0056] The specific process of step S3 is as follows: Select the outer skin of the steel strip and pre-treat it to remove the grease on the surface of the steel strip, for example, use alcohol to remove the grease on the surface of the steel strip; then bend the outer skin of the steel strip into a U-shaped groove structure using a welding wire forming machine, fill the U-shaped groove with the mixed flux core, and close the U-shaped groove.

[0057] In one embodiment, the steel strip outer sheath in step S3 is selected from stainless steel strip with low levels of harmful elements such as sulfur and phosphorus. Further, the steel strip outer sheath contains less than or equal to 0.01% carbon, less than or equal to 0.02% silicon, less than or equal to 0.008% phosphorus, less than or equal to 0.008% sulfur, and 0.1-0.25% manganese by mass; even further, the steel strip outer sheath is made of HS1 steel strip.

[0058] In step S3, the filling amount of the flux core accounts for 19% to 21% of the total mass of the acid flux-cored welding wire. For example, it can be 19%, 20%, or 21%, etc.

[0059] Step S4 involves using a wire drawing machine to draw and reduce the diameter of the steel strip filled with flux to a preset diameter, thereby obtaining an acid flux-cored welding wire that meets the requirements.

[0060] In one embodiment, the preset diameter is 1.2~1.6mm, such as 1.2mm, 1.4mm or 1.6mm, etc.

[0061] A third aspect of this invention also provides an application of an acidic flux-cored welding wire for welding high-strength Q690 rack steel. The weld produced by this wire exhibits excellent high strength, high and low temperature impact toughness, and corrosion resistance. The wire also demonstrates good welding processability, good arc stability, minimal spatter, aesthetically pleasing weld formation, and good slag removal, resulting in a high deposition rate and deposition efficiency.

[0062] The technical solution of the present invention will be described in detail below through several specific embodiments and comparative examples. Unless otherwise stated, the raw materials and reagents used in the following embodiments are all commercially available products, or can be prepared by conventional methods in the art, and the instruments used in the embodiments are all commercially available.

[0063] Example 1

[0064] This embodiment provides an acidic flux-cored welding wire, which includes a steel strip outer sheath and a flux core filled within the steel strip outer sheath. The steel strip outer sheath is made of HS1 steel strip with a size of 0.6 mm. 10mm; The core contains the following components and their respective mass contents: rutile 50%, zircon sand 2.5%, potassium feldspar 2.5%, potassium fluorozirconate 1.5%, quartz 3%, metallic manganese 16%, ferrosilicon 3%, nickel powder 15%, cobalt powder 1%, molybdenum powder 1.5%, aluminum zirconium alloy 1%, magnesium powder 1.5%, perovskite 1%, and the balance is atomized iron powder.

[0065] The preparation process of the above-mentioned flux-cored welding wire is as follows:

[0066] Weigh out the following components according to the specified ratio: 50% rutile, 2.5% zircon sand, 2.5% potassium feldspar, 1.5% potassium fluorozirconate, 3% quartz, 16% metallic manganese, 3% ferrosilicon, 15% nickel powder, 1% cobalt powder, 1.5% molybdenum powder, 1% aluminum zirconium alloy, 1.5% magnesium powder, 1% perovskite, atomized iron powder, and the remainder. Then, heat the potassium fluorosilicate, metallic manganese, 45% ferrosilicon, nickel powder, cobalt powder, molybdenum powder, aluminum zirconium alloy, magnesium powder, and atomized iron powder at 150℃ for 120 minutes, and heat the quartz, rutile, zircon sand, perovskite, and potassium feldspar at 850℃ for 360 minutes.

[0067] The dried components are mixed evenly to obtain the flux core; the outer skin of the steel strip is bent into a U-shaped groove structure using a wire forming machine, the mixed flux core is filled into the U-shaped groove, and the joint is closed; the wire is drawn and reduced to 1.2 mm diameter using a wire drawing machine to obtain an acid flux-cored welding wire, wherein the flux core filling rate is 19%.

[0068] Example 2

[0069] This embodiment provides an acidic flux-cored welding wire, which includes a steel strip outer sheath and a flux core filled within the steel strip outer sheath. The steel strip outer sheath is made of HS1 steel strip with a size of 0.6 mm. 10mm; The core contains the following components and their respective mass contents: rutile 35%, zircon sand 3.5%, potassium feldspar 4%, potassium fluorozirconate 2%, quartz 2%, metallic manganese 20%, ferrosilicon 4%, nickel powder 19%, cobalt powder 1.5%, molybdenum powder 1%, aluminum zirconium alloy 2%, magnesium powder 2%, perovskite 1.5%, and the balance is atomized iron powder.

[0070] The preparation process of the above-mentioned flux-cored welding wire is as follows:

[0071] Weigh out the following components according to the specified ratio: 35% rutile, 3.5% zircon sand, 4% potassium feldspar, 2% potassium fluorozirconate, 2% quartz, 20% metallic manganese, 4% ferrosilicon, 19% nickel powder, 1.5% cobalt powder, 1% molybdenum powder, 2% aluminum-zirconium alloy, 2% magnesium powder, 1.5% perovskite, with the remainder being atomized iron powder. Then, heat the potassium fluorosilicate, metallic manganese, 45% ferrosilicon, nickel powder, cobalt powder, molybdenum powder, aluminum-zirconium alloy, magnesium powder, and atomized iron powder at 160℃ for 120 minutes, and heat the quartz, rutile, zircon sand, perovskite, and potassium feldspar at 850℃ for 360 minutes.

[0072] The dried components are mixed evenly to obtain the flux core; the outer skin of the steel strip is bent into a U-shaped groove structure using a wire forming machine, the mixed flux core is filled into the U-shaped groove, and the joint is closed; the wire is drawn and reduced to 1.2 mm diameter using a wire drawing machine to obtain an acid flux-cored welding wire, wherein the flux core filling rate is 20%.

[0073] Example 3

[0074] This embodiment provides an acidic flux-cored welding wire, which includes a steel strip outer sheath and a flux core filled within the steel strip outer sheath. The steel strip outer sheath is made of HS1 steel strip with a size of 0.6 mm. 10mm; The core contains the following components and their respective mass contents: rutile 40%, zircon sand 4%, potassium feldspar 3%, potassium fluorozirconate 1.5%, quartz 2.5%, metallic manganese 15%, 45% ferrosilicon 3%, nickel powder 20%, cobalt powder 2%, molybdenum powder 1.5%, aluminum zirconium alloy 1.5%, magnesium powder 3%, perovskite 2%, and the balance is atomized iron powder.

[0075] The preparation process of the above-mentioned flux-cored welding wire is as follows:

[0076] Weigh out the following ingredients according to the specified ratio: 40% rutile, 4% zircon sand, 3% potassium feldspar, 1.5% potassium fluorozirconate, 2.5% quartz, 15% metallic manganese, 3% 45% ferrosilicon, 20% nickel powder, 2% cobalt powder, 1.5% molybdenum powder, 1.5% aluminum-zirconium alloy, 3% magnesium powder, 2% perovskite, with the remainder being atomized iron powder. Then, heat the potassium fluorosilicate, metallic manganese, 45% ferrosilicon, nickel powder, cobalt powder, molybdenum powder, aluminum-zirconium alloy, magnesium powder, and atomized iron powder at 170℃ for 120 minutes, and heat the quartz, rutile, zircon sand, perovskite, and potassium feldspar at 850℃ for 360 minutes.

[0077] The dried components are mixed evenly to obtain the flux core; the outer skin of the steel strip is bent into a U-shaped groove structure using a wire forming machine, the mixed flux core is filled into the U-shaped groove, and the joint is closed; the wire is drawn and reduced to 1.6 mm diameter using a wire drawing machine to obtain an acid flux-cored welding wire with a flux core filling rate of 21%.

[0078] Example 4

[0079] This embodiment provides an acidic flux-cored welding wire, which includes a steel strip outer sheath and a flux core filled within the steel strip outer sheath. The steel strip outer sheath is made of HS1 steel strip with a size of 0.6 mm. 10mm; The core contains the following components and their respective mass contents: rutile 38%, zircon sand 5%, potassium feldspar 5%, potassium fluorozirconate 3%, quartz 1.5%, metallic manganese 17%, 45% ferrosilicon 5%, nickel powder 16%, cobalt powder 1.5%, molybdenum powder 1%, aluminum zirconium alloy 1%, magnesium powder 3.5%, perovskite 1%, and the balance is atomized iron powder.

[0080] The preparation process of the above-mentioned flux-cored welding wire is as follows:

[0081] Weigh out the following components according to the specified ratio: 38% rutile, 5% zircon sand, 5% potassium feldspar, 3% potassium fluorozirconate, 1.5% quartz, 17% metallic manganese, 5% 45% ferrosilicon, 16% nickel powder, 1.5% cobalt powder, 1% molybdenum powder, 1% aluminum-zirconium alloy, 3.5% magnesium powder, 1% perovskite, with the remainder being atomized iron powder. Then, heat the potassium fluorosilicate, metallic manganese, 45% ferrosilicon, nickel powder, cobalt powder, molybdenum powder, aluminum-zirconium alloy, magnesium powder, and atomized iron powder at 170℃ for 120 minutes, and heat the quartz, rutile, zircon sand, perovskite, and potassium feldspar at 850℃ for 360 minutes.

[0082] The dried components are mixed evenly to obtain the flux core; the outer skin of the steel strip is bent into a U-shaped groove structure using a wire forming machine, the mixed flux core is filled into the U-shaped groove, and the joint is closed; the wire is drawn and reduced to 1.6 mm diameter using a wire drawing machine to obtain an acid flux-cored wire, wherein the flux core filling rate is 20%.

[0083] The flux composition of the acidic flux-cored welding wires in Examples 1 to 4 is shown in Table 1, and the parameters of the welding wires are shown in Table 2.

[0084] Table 1: Flux composition of acidic flux-cored wires in Examples 1 to 4

[0085]

[0086] Table 2: Parameters of Acidic Flux-Cored Welding Wires in Examples 1 to 4

[0087]

[0088] To further verify the efficacy of the present invention, Q690 rack steel was surfacing welded using the acidic flux-cored welding wires of Examples 1 to 4 according to relevant standards and specifications in the field. The performance of the welded metal was then tested. The welding process parameters for each example are shown in Table 3, and the performance test results of the welded metal are shown in Table 4. It should be noted that the extension length in the table below refers to the distance from the contact tip to the workpiece minus the arc length; the Charpy V-notch impact energy was obtained through the Charpy impact test. The Charpy impact test is used to determine the notch sensitivity (toughness) of metallic materials. The test specimen has two types: U-notch and V-notch. The test in this application uses a V-notch. The specimen is placed in a simply supported beam state on the Charpy impact testing machine. An impact is made by the pendulum raised by the testing machine, causing the specimen to break along the notch. The absorbed energy of the specimen is calculated using the difference in the height of the pendulum's re-rise at the break. A large absorbed energy value (joules) indicates good material toughness and insensitivity to notches or other stress concentrations in the structure.

[0089] Table 3: Welding process performance of acid flux-cored wires in Examples 1 to 4

[0090]

[0091] Table 4: Welding performance of acidic flux-cored welding wires in Examples 1 to 4

[0092]

[0093] The test results of Examples 1 to 4 show that the deposited metal after welding with the acid flux-cored welding wire of the present invention has the characteristics of high strength, high and low temperature impact toughness, and corrosion resistance. In addition, the welding wire has good welding processability, good arc stability, less spatter, beautiful weld formation, good slag removal, and high deposition rate and deposition rate; it can meet the requirements of matching Q690 rack steel.

[0094] This invention relates to an acid-cored welding wire that adjusts the composition of the flux core to regulate the content of elements such as aluminum, titanium, and molybdenum in the weld, thereby refining the grain size and achieving high yield strength, tensile strength, high fracture toughness, and excellent welding performance. It also adjusts the ratio of cobalt and nickel in the weld to promote iron production. cobalt Nickel high-entropy alloy structure, iron cobalt The nickel high-entropy alloy structure, due to its excellent wear resistance and corrosion resistance, enables the welding material to adapt to the harsh operating environment of high-strength steel. Furthermore, by strictly controlling the content of harmful elements such as sulfur and phosphorus in the outer layer of the steel strip, the brittleness of the deposited metal is reduced. Therefore, this invention effectively overcomes some practical problems in the prior art, thus possessing high utilization value and practical significance.

[0095] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An acidic flux-cored welding wire, characterized in that, It includes a steel strip outer sheath and a core filled within the steel strip sheath, wherein the core comprises the following components by mass percentage: Rutile 45-50%; Zircon sand 2.5~5%; Potassium feldspar 2.5-5%; Potassium fluorozirconate 1.5~3%; Quartz 1.5~3%; Manganese metal 15-20%; Ferrosilicon 3~5%; Nickel powder 15-20%; Cobalt powder 1~2%; 1-2% molybdenum powder; Aluminum-zirconium alloy 1~2%; Magnesium powder 1.5~3.5%; Perovskite 1-2%; Remaining amount of atomized iron powder; The steel strip outer sheath contains carbon at a mass content of less than or equal to 0.01%, silicon at a mass content of less than or equal to 0.02%, phosphorus at a mass content of less than or equal to 0.008%, sulfur at a mass content of less than or equal to 0.008%, and manganese at a mass content of 0.1~0.25%.

2. The acidic flux-cored welding wire according to claim 1, characterized in that, The rutile contains 95% or more titanium dioxide by mass; the zircon sand contains 66% or more zirconium dioxide by mass and 32% or less silicon dioxide by mass; the potassium feldspar contains 63-73% silicon dioxide by mass and 15-22% alumina by mass; the potassium fluorozirconate has a purity of 99% or more; the quartz contains 97% or more silicon dioxide by mass; the metallic manganese contains 99% or more manganese by mass; and the ferrosilicon contains 42% or more silicon by mass. 47%; the nickel powder contains 99% or more nickel by mass; the cobalt powder contains 98% or more cobalt by mass; the molybdenum powder contains 95% or more molybdenum by mass; the aluminum-zirconium alloy contains 14-18% aluminum by mass, less than 1.5% impurities, and the balance is zirconium; the perovskite contains 38-43% calcium oxide and 56-62% titanium dioxide by mass; the magnesium powder contains 98% or more magnesium by mass; the atomized iron powder contains 99% or more iron by mass.

3. The acidic flux-cored welding wire according to claim 1, characterized in that, The particle size of each component in the core is 60-80 mesh.

4. The acidic flux-cored welding wire according to claim 1, characterized in that, The mass of the flux core accounts for 19-21% of the total mass of the acid flux-cored welding wire.

5. The acidic flux-cored welding wire according to claim 1, characterized in that, The diameter of the acidic flux-cored welding wire is 1.2~1.6mm.

6. A method for preparing an acidic flux-cored welding wire, characterized in that, Includes the following steps: Weigh each component according to the proportions described in claim 1, and dry each component. The dried components are mixed evenly to obtain the core. The steel strip is rolled into a U-shaped groove, and the core is filled into the U-shaped groove and closed. The steel strip filled with the flux core is drawn and reduced to a preset diameter to obtain an acid flux-cored welding wire.

7. The preparation method according to claim 6, characterized in that, The drying process for each component includes: holding potassium fluorozirconate, metallic manganese, ferrosilicon, nickel powder, cobalt powder, molybdenum powder, aluminum-zirconium alloy, magnesium powder, and atomized iron powder at 150-170°C for 120 minutes; and holding quartz, rutile, zircon sand, perovskite, and potassium feldspar at 850°C for 360 minutes.

8. The application of the acidic flux-cored welding wire according to any one of claims 1 to 5, characterized in that, The acidic flux-cored welding wire is used for welding high-strength Q690 rack steel.

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