A nickel-based electrode and a method for manufacturing the same

Abstract

The application provides a nickel-based welding rod and a preparation method thereof, and particularly relates to the field of welding materials. The nickel-based welding rod comprises a welding core and a coating, and the coating comprises the following components and the weight fractions of the components are as follows: 23-29 parts of marble, 15-22 parts of fluorite, 2-8 parts of metallic chromium, 5-10 parts of barium carbonate, 1-5 parts of phlogopite, 10-16 parts of ferromolybdenum, 0.4-0.9 parts of sodium alginate, 5-10 parts of cryolite, 3-9 parts of tungsten powder, 1-4 parts of atomized iron powder, 1-4 parts of potassium titanate, 0.8-1.5 parts of titanium white powder, 1-6 parts of rutile, 0.1-0.8 parts of antimony oxide, 2-6 parts of ferrotitanium, 2-6 parts of zircon, and 1-4 parts of nickel powder. The nickel-based welding rod has good performances of resisting active gas, resisting caustic medium and resisting reducing acid medium corrosion, and has the characteristics of high strength, good plasticity, cold and hot deformation and processing.

Description

A nickel-based welding electrode and its preparation method Technical Field

[0001] This invention relates to the field of welding materials, and more specifically to a nickel-based welding electrode and its preparation method. Background Technology

[0002] The development of modern industry has placed increasingly higher demands on materials. In order to meet various demanding usage conditions, the research and development of various new materials has received great attention, and the corresponding welding materials have also developed accordingly. The product structure and variety of welding materials have undergone great changes. New and efficient welding materials have made great progress and have been widely used. Among them, the most widely used new special welding materials are stainless steel welding materials and nickel-based alloy welding materials.

[0003] The widespread recognition of the superior properties of nickel-based corrosion-resistant alloys has led to a continuous expansion of their application fields. Years of research and application have shown that nickel-based alloys are the best corrosion-resistant materials, and sometimes the only choice, capable of adapting to various harsh environments (high temperature, high pressure, high chemical concentration). The demanding media environments of modern industrial technology (coexistence of multiple media, high temperature and pressure, high radiation, etc.) require corrosion-resistant alloys to have greater versatility. Nickel and nickel alloy welding materials are widely used in applications such as offshore drilling platforms, land-based or ship-based gas turbines, high-temperature combustion chambers of various aerospace and aviation engines, flue gas desulfurization equipment in nuclear power and thermal power plants, new exhaust systems in automobiles, military weaponry, and petroleum refining and various chemical equipment. For example, the nickel-chromium alloy 625 exhibits excellent resistance to chloride ion oxidation-reduction composite corrosion and seawater corrosion, and its high thermal strength makes it promising for applications in marine engineering, petrochemicals, and nuclear power. Therefore, there is a need to develop a nickel-based welding electrode to meet the welding and surface surfacing needs between various nickel-based corrosion-resistant alloys and dissimilar materials such as stainless steel. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a nickel-based welding electrode and its preparation method to improve the problem of insufficient welding materials for high-strength steel welding in China.

[0005] To achieve the above and other related objectives, the present invention provides a nickel-based welding electrode, comprising a core and a coating. The coating comprises the following components in the following weight proportions: marble 23-29 parts, fluorite 15-22 parts, metallic chromium 2-8 parts, barium carbonate 5-10 parts, phlogopite 1-5 parts, ferromolybdenum 10-16 parts, sodium alginate 0.4-0.9 parts, cryolite 5-10 parts, tungsten powder 3-9 parts, atomized iron powder 1-4 parts, potassium titanate 1-4 parts, titanium dioxide 0.8-1.5 parts, rutile 1-6 parts, antimony oxide 0.1-0.8 parts, ilmenite 2-6 parts, zircon sand 2-6 parts, and nickel powder 1-4 parts.

[0006] In one example of the present invention, the marble contains ≥96 wt% calcium carbonate, the fluorite contains ≥95 wt% calcium fluoride, the rutile contains ≥95 wt% titanium dioxide, the ilmenite contains 25-35 wt% titanium, the atomized iron powder contains ≥95 wt% iron, the tungsten powder contains ≥99 wt% tungsten, the metallic chromium contains ≥99 wt% chromium, and the nickel powder contains ≥99 wt% nickel.

[0007] In one example of the present invention, the sodium alginate has a particle size of 80-120 mesh, and the other components have a particle size of 40-80 mesh.

[0008] In one example of the present invention, the welding core is made of NiCrMo-3 steel core, and the diameter of the welding core is 2.5 to 4.0 mm.

[0009] The present invention also provides a method for preparing a nickel-based welding electrode, comprising the following steps: mixing the above components evenly to prepare a coating; adding a binder to the coating and stirring evenly to form a coating mixture; pressing the coating mixture onto the surface of the welding core and drying it to obtain the nickel-based welding electrode.

[0010] In one example of the present invention, the adhesive is a water glass adhesive, and the weight of the adhesive is 20-23% of the total weight of the coating.

[0011] In one example of the present invention, the weight of the dried coating mixture in the nickel-based welding electrode is 40-45% of the total weight of the nickel-based welding electrode.

[0012] In one example of the present invention, the pressure during pressure coating is 8 to 12 MPa.

[0013] In one example of the present invention, the drying temperature is 350-380°C and the drying time is 1-2 hours.

[0014] The nickel-based welding electrode of this invention incorporates marble in its coating, which, at arc temperature, functions to form slag and gas, thus improving the electrode's resistance to porosity. The addition of atomized iron powder, metallic manganese, ferrotitanium, ferromolybdenum, tungsten powder, nickel powder, and antimony oxide further alloys the weld. Chromium, iron, tungsten, and antimony elements enhance weld hardness, while nickel, molybdenum, and titanium refine the microstructure of the deposited metal, improving weld toughness. This nickel-based welding electrode exhibits excellent resistance to reactive gases, harsh media, and reducing acid corrosion, while also possessing high strength, good plasticity, and the ability to be cold- and hot-deformed, processed, and weldable. Attached Figure Description

[0015] 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.

[0016] Figure 1 is a flowchart of the preparation process of the nickel-based welding electrode of the present invention. Detailed Implementation

[0017] 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 can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementation schemes and not for limiting the scope of protection of the present invention. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0018] Please note that in this instruction manual, "%" and "wt%" both represent weight percentages, and "parts" represents weight parts.

[0019] This invention provides a nickel-based welding electrode, which includes a core and a coating. The coating comprises the following components in the indicated weight parts: marble 23-29 parts, fluorite 15-22 parts, metallic chromium 2-8 parts, barium carbonate 5-10 parts, phlogopite 1-5 parts, ferromolybdenum 10-16 parts, sodium alginate 0.4-0.9 parts, cryolite 5-10 parts, tungsten powder 3-9 parts, atomized iron powder 1-4 parts, potassium titanate 1-4 parts, titanium dioxide 0.8-1.5 parts, rutile 1-6 parts, antimony oxide 0.1-0.8 parts, ilmenite 2-6 parts, zircon sand 2-6 parts, and nickel powder 1-4 parts.

[0020] The functions of each component in the drug coating are as follows:

[0021] Marble: Primarily serves to generate gas and slag. The marble contains ≥96wt% calcium carbonate. During welding, calcium carbonate decomposes into calcium oxide and carbon dioxide gas. The generated carbon dioxide keeps the molten pool under inert gas protection. The coating of this invention contains 23–29 parts by weight of marble. For example, the weight of marble can be any value within the range of 23–29 parts, such as 23, 25, 27, or 29 parts.

[0022] Fluorite: Primarily serves as a slag-forming agent. Fluorite contains ≥95wt% calcium fluoride. During welding, calcium acts as a deoxidizer and desulfurizer, while fluorine removes hydrogen. Therefore, fluorite also purifies the weld metal. The coating of this invention contains 15-22 parts by weight of fluorite, for example, any value within the range of 15-22 parts, such as 15 parts, 19 parts, or 22 parts.

[0023] Metallic chromium: Its main function is to introduce chromium into the deposited metal, thereby improving its corrosion resistance. It also acts as a deoxidizer; however, excessive addition of metallic chromium can affect the chemical composition of the deposited metal. In the coating of this invention, the weight percentage of metallic chromium is 2 to 8 parts, for example, any value within the range of 2 to 8 parts, such as 2 parts, 5 parts, or 8 parts.

[0024] Barium carbonate: mainly used as an arc stabilizer and to improve pressure coating performance; excessive amounts can increase splattering. The weight percentage of barium carbonate in the coating of this invention is 5 to 10 parts, for example, any value within the range of 5 to 10 parts, such as 5 parts, 8 parts, or 10 parts.

[0025] Phlogopite: Primarily used as a slag-forming agent, arc stabilizer, and improves pressure coating performance. Excessive amounts can increase spatter, increase hydrogen content in the weld, and affect the low-temperature impact toughness of the deposited metal. The coating of this invention contains 1 to 5 parts by weight of phlogopite, for example, any value within the range of 1 to 5 parts, such as 1 part, 3 parts, or 5 parts.

[0026] Titanium iron: Titanium iron contains 25-35 wt% titanium and is mainly used as a deoxidizer. Excessive amounts will increase splashing. The weight percentage of titanium iron in the coating of this invention is 2-6 parts, for example, any value within the range of 2-6 parts, such as 2 parts, 3.5 parts, or 6 parts.

[0027] Sodium alginate: mainly used as an arc stabilizer, gas generator, and improver for pressure coating performance. However, it contains a relatively high amount of water of crystallization, which increases the porosity sensitivity of the welding electrode. The coating of this invention contains 0.4 to 0.9 parts by weight of sodium alginate, for example, any value within the range of 0.4 to 0.9 parts, such as 0.4, 0.6, or 0.9 parts.

[0028] Antimony oxide: The main component of antimony oxide is antimony dioxide, and its main function is to form slag and improve the physical properties of the slag. The weight part of antimony oxide in the coating of this invention is 0.1 to 0.8 parts. For example, the weight part of antimony oxide can be any value within the range of 0.1 to 0.8 parts, such as 0.1 parts, 0.3 parts, 0.5 parts, or 0.8 parts.

[0029] Atomized iron powder: The iron content of the atomized iron powder is ≥95wt%. It is mainly used to add a certain amount of iron to nickel-based materials. Appropriate addition of a certain amount of atomized iron powder can stabilize the weld microstructure. The weight parts of atomized iron powder in the coating of this invention are 1 to 4 parts, for example, the weight parts of atomized iron powder can be any value within the range of 1 to 4 parts, such as 1 part, 2 parts, 3 parts or 4 parts.

[0030] Potassium titanate: mainly used as an arc stabilizer and slag-forming agent; excessive amounts can increase splashing. The weight percentage of potassium titanate in the coating of this invention is 1 to 4 parts. For example, the weight percentage of potassium titanate can be any value within the range of 1 to 4 parts, such as 2 parts, 3 parts, or 4 parts.

[0031] Titanium dioxide: Its main component is titanium dioxide, which is mainly used as an arc stabilizer and can improve the coating performance of welding electrodes. The titanium dioxide in the coating of this invention is 0.8 to 1.5 parts by weight, for example, the titanium dioxide can be any value within the range of 0.8 to 1.5 parts by weight, such as 0.8 parts, 1.2 parts, or 1.5 parts.

[0032] Rutile: The main component of rutile is titanium dioxide. In this invention, the titanium dioxide content in the rutile is ≥95wt%, which can stabilize the electric arc, reduce splashing, and improve slag removal when combined with other slag-forming agents. The weight part of rutile in the coating of this invention is 1 to 6 parts, for example, the weight part of rutile can be any value within the range of 1 to 6 parts, such as 1 part, 3 parts, 4 parts, or 6 parts.

[0033] Cryolite: The main components of cryolite are a complex salt of aluminum oxide, fluorine, and sodium. Its main functions are slag formation, improving the physical properties of slag, removing hydrogen, and improving the processing performance of welding electrodes. The weight percentage of cryolite in the coating of this invention is 5 to 10 parts, for example, any value within the range of 5 to 10 parts, such as 5 parts, 6 parts, 8 parts, or 10 parts.

[0034] Zircon sand: The main function of zircon sand is as a slag-forming agent. When combined with other slag-forming agents, it can improve slag removal. The weight percentage of zircon sand in the coating of this invention is 2 to 6 parts, for example, the weight percentage of zircon sand can be any value within the range of 2 to 6 parts, such as 2 parts, 4 parts, or 6 parts.

[0035] Tungsten powder: Primarily used in alloying. The tungsten content in the tungsten powder is ≥99wt%. Tungsten can increase tempering stability, red hardness, hot strength, and wear resistance due to carbide formation. It can also reduce the overheating sensitivity of steel, increase hardenability, and improve hardness and machinability. In the coating of this invention, the weight percentage of tungsten powder is 3 to 9 parts, for example, any value within the range of 3 to 9 parts, such as 3 parts, 5 parts, 8 parts, or 9 parts.

[0036] Nickel powder: mainly used for alloying. The nickel content in the nickel powder is ≥99wt%. Nickel can improve the toughness of materials. The nickel powder in the coating of this invention is 1 to 4 parts by weight. For example, the weight of nickel powder can be any value within the range of 1 to 4 parts, such as 1 part, 3 parts, or 4 parts.

[0037] In one embodiment, the sodium alginate has a particle size of 80-120 mesh, and the other components have a particle size of 40-80 mesh.

[0038] Please refer to Figure 1. This invention provides a method for preparing a nickel-based welding electrode, comprising the following steps:

[0039] S1. Mix the components evenly according to the proportions to prepare the drug coating;

[0040] S2. Add binder to the drug coating and stir evenly to form a drug coating mixture;

[0041] S3. Press the coating mixture onto the surface of the welding core and dry it to obtain a nickel-based welding electrode.

[0042] In step S1, the components in the drug coating are mixed and stirred evenly according to the following proportions: marble 23-29 parts, fluorite 15-22 parts, metallic chromium 2-8 parts, barium carbonate 5-10 parts, phlogopite 1-5 parts, ferromolybdenum 10-16 parts, sodium alginate 0.4-0.9 parts, cryolite 5-10 parts, tungsten powder 3-9 parts, atomized iron powder 1-4 parts, potassium titanate 1-4 parts, titanium dioxide 0.8-1.5 parts, rutile 1-6 parts, antimony oxide 0.1-0.8 parts, ilmenite 2-6 parts, zircon sand 2-6 parts, and nickel powder 1-4 parts.

[0043] In step S2, the binder is a potassium sodium water glass binder with a modulus of 2.8 to 3.1 and a mass of 20 to 23% of the total mass of the drug coating mixture.

[0044] In step S3, the welding core is made of NiCrMo-3 steel and the diameter of the welding core is 2.5 to 4.0 mm. For example, the diameter of the welding core can be any value in the range of 2.5 to 4.0 mm, such as 2.5 mm, 3.2 mm or 4 mm.

[0045] During pressure coating, operations such as pressure coating and forming are performed on conventional hydraulic welding electrode production equipment to uniformly press the coating powder onto the surface of the welding core. The pressure coating pressure is 8 to 12 MPa, for example, any value within the range of 8 to 12 MPa, such as 8 MPa, 10 MPa, or 12 MPa.

[0046] The nickel-based welding electrode of the present invention is then dried at 350–380°C. The drying temperature can be any value within the range of 350–380°C, for example, 350°C, 360°C, or 380°C, and the drying time can be any value within the range of 1–2 hours, such as 1 hour, 1.5 hours, or 2 hours.

[0047] The present invention will be described in detail below through some specific embodiments. The pharmaceuticals used in the following embodiments can all be obtained through common commercial means.

[0048] Example 1

[0049] The nickel-based welding electrode of this embodiment includes a core and a coating. The coating comprises the following components and their respective weight parts: 24 parts marble, 17 parts fluorite, 3 parts metallic chromium, 5 parts barium carbonate, 2 parts phlogopite, 11 parts ferromolybdenum, 0.5 parts sodium alginate, 6 parts cryolite, 4 parts tungsten powder, 1.5 parts atomized iron powder, 2 parts potassium titanate, 0.9 parts titanium dioxide, 2 parts rutile, 0.2 parts antimony oxide, 2 parts ferrotitanium, 3 parts zircon sand, and 2 parts nickel powder.

[0050] During preparation, a 2.5mm NiCrMo-3 welding core was selected. 23% of the total mass of the dry powder mixture of water glass binder was added to the above coating. The mixture was stirred and mixed evenly to form a coating mixture. The coating mixture was then applied to the surface of the welding core at 8MPa and dried at 350℃ for 1h to obtain a nickel-based welding electrode. The weight of the dried coating mixture accounted for 40% of the total weight of the nickel-based welding electrode.

[0051] Example 2

[0052] The nickel-based welding electrode of this embodiment includes a core and a coating. The coating comprises the following components and their respective weight parts: 26 parts marble, 19 parts fluorite, 5 parts metallic chromium, 7 parts barium carbonate, 3 parts phlogopite, 13 parts ferromolybdenum, 0.7 parts sodium alginate, 8 parts cryolite, 6 parts tungsten powder, 2 parts atomized iron powder, 3 parts potassium titanate, 1.2 parts titanium dioxide, 4 parts rutile, 0.5 parts antimony oxide, 4 parts ferrotitanium, 5 parts zircon sand, and 3 parts nickel powder.

[0053] During preparation, a 3.2mm NiCrMo-3 welding core was selected. 22% of the total mass of the dry powder mixture was added to the above coating as water glass binder. The mixture was stirred and mixed evenly to form a coating mixture. The coating mixture was then applied to the surface of the welding core at 12MPa and dried at 360℃ for 1.5h to obtain a nickel-based welding electrode. The weight of the dried coating mixture accounted for 43% of the total weight of the nickel-based welding electrode.

[0054] Example 3

[0055] The nickel-based welding electrode of this embodiment includes a core and a coating. The coating comprises the following components and their respective weight parts: 28 parts marble, 21 parts fluorite, 7 parts metallic chromium, 9 parts barium carbonate, 5 parts phlogopite, 15 parts ferromolybdenum, 0.9 parts sodium alginate, 10 parts cryolite, 8 parts tungsten powder, 2.5 parts atomized iron powder, 4 parts potassium titanate, 1.4 parts titanium dioxide, 6 parts rutile, 0.7 parts antimony oxide, 6 parts ferrotitanium, 6 parts zircon sand, and 4 parts nickel powder.

[0056] During preparation, a 4mm NiCrMo-3 welding core was selected. 20% of the total mass of the dry powder mixture was added to the above coating as water glass binder. The mixture was stirred and mixed evenly to form a coating mixture. The coating mixture was then applied to the surface of the welding core at 10MPa and dried at 380℃ for 2 hours to obtain a nickel-based welding electrode. The weight of the dried coating mixture accounted for 45% of the total weight of the nickel-based welding electrode.

[0057] Example 4

[0058] The nickel-based welding electrode of this embodiment includes a core and a coating. The coating includes the following components and their respective weight parts: 29 parts marble, 22 parts fluorite, 2 parts metallic chromium, 8 parts barium carbonate, 2 parts phlogopite, 10 parts ferromolybdenum, 0.4 parts sodium alginate, 5 parts cryolite, 3 parts tungsten powder, 1 part atomized iron powder, 3 parts potassium titanate, 0.8 parts titanium dioxide, 1 part rutile, 0.1 parts antimony oxide, 3 parts ferrotitanium, 2 parts zircon sand, and 3 parts nickel powder.

[0059] During preparation, a 5.0 mm NiCrMo-3 welding core was selected. 21% of the total mass of the dry powder mixture was added to the above coating as water glass binder. The mixture was stirred and mixed evenly to form a coating mixture. The coating mixture was then applied to the surface of the welding core at 9 MPa and dried at 360°C for 1.5 h to obtain a nickel-based welding electrode. The weight of the dried coating mixture accounted for 41% of the total weight of the nickel-based welding electrode.

[0060] Example 5

[0061] The nickel-based welding electrode of this embodiment includes a core and a coating. The coating includes the following components and their respective weight parts: 23 parts marble, 15 parts fluorite, 8 parts metallic chromium, 10 parts barium carbonate, 1 part phlogopite, 16 parts ferromolybdenum, 0.8 parts sodium alginate, 9 parts cryolite, 9 parts tungsten powder, 4 parts atomized iron powder, 1 part potassium titanate, 1.5 parts titanium dioxide, 6 parts rutile, 0.8 parts antimony oxide, 5 parts ferrotitanium, 4 parts zircon sand, and 3 parts nickel powder.

[0062] During preparation, a 3.2mm NiCrMo-3 welding core was selected. 22% of the total mass of the dry powder mixture was added to the above coating as water glass binder. The mixture was stirred and mixed evenly to form a coating mixture. The coating mixture was then applied to the surface of the welding core at 10MPa and dried at 360℃ for 1.8h to obtain a nickel-based welding electrode. The weight of the dried coating mixture accounted for 40% of the total weight of the nickel-based welding electrode.

[0063] The content of each component in the coating of the nickel-based welding electrodes in Examples 1 to 5 is shown in Table 1, and the parameters of the nickel-based welding electrodes are shown in Table 2. The chemical composition of the deposited metal and welding processability tests were conducted on the nickel-based welding electrodes prepared in Examples 1 to 5 according to relevant standards and specifications. The chemical composition of the deposited metal is shown in Table 3, and the welding performance is shown in Table 4.

[0064] Table 1. Coating composition of nickel-based welding electrodes prepared in Examples 1 to 5

[0065]

[0066]

[0067] Table 2 Electrode Parameters

[0068]

[0069] Table 3 Chemical composition of deposited metal

[0070]

[0071] Table 4 Welding performance

[0072] During mechanical testing, three groups of weld metal were selected for mechanical property testing (welded state).

[0073]

[0074]

[0075] As can be seen from Tables 3 and 4, the nickel-based welding electrodes prepared in Examples 1 to 5 of the present invention have the following characteristics:

[0076] (1) It has high strength, and the tensile strength of the welded metal can reach more than 760MPa;

[0077] (2) It has good low-temperature impact toughness, and the average impact energy at -196℃ reaches more than 75J.

[0078] (3) It has good weldability, stable arc during welding, easy operation, good weld formation, and convenient slag removal;

[0079] (4) The production process of welding electrodes is simple and the cost is low.

[0080] The nickel-based welding electrode of this invention incorporates marble in its coating, which, at arc temperature, functions to form slag and generate gas, thus improving the electrode's resistance to porosity. The addition of metallic chromium, ferrotitanium, molybdenum powder, tungsten powder, nickel powder, and atomized iron powder further alloys the weld. Chromium, molybdenum, tungsten, and iron elements enhance the overall weld performance, while nickel and molybdenum refine the microstructure of the deposited metal and improve weld toughness. The nickel-based welding electrode prepared by this invention has a smooth surface, good pressure coating properties, strong hardenability and quenchability, as well as good wear resistance and dimensional stability. Therefore, this invention effectively overcomes some practical problems in the prior art, thus possessing high utilization value and practical significance.

[0081] 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. A nickel-based welding electrode, characterized in that, The welding core and flux coating are included. The flux coating is composed of the following components in parts by weight: marble 23-29 parts, fluorite 15-22 parts, metallic chromium 2-8 parts, barium carbonate 5-10 parts, phlogopite 1-5 parts, ferromolybdenum 10-16 parts, sodium alginate 0.4-0.9 parts, cryolite 5-10 parts, tungsten powder 3-9 parts, atomized iron powder 1-4 parts, potassium titanate 1-4 parts, titanium dioxide 0.8-1.5 parts, rutile 1-6 parts, antimony oxide 0.1-0.8 parts, ilmenite 2-6 parts, zirconium The welding core consists of 2-6 parts of quartz sand and 1-4 parts of nickel powder. The welding core is made of NiCrMo-3. The marble contains ≥96wt% calcium carbonate, the fluorite contains ≥95wt% calcium fluoride, the rutile contains ≥95wt% titanium dioxide, the ilmenite contains 25-35wt% titanium, the atomized iron powder contains ≥95wt% iron, the tungsten powder contains ≥99wt% tungsten, the metallic chromium contains ≥99wt% chromium, and the nickel powder contains ≥99wt% nickel.

2. The nickel-based welding electrode according to claim 1, characterized in that, The sodium alginate has a particle size of 80-120 mesh, while the other components have a particle size of 40-80 mesh.

3. The nickel-based welding electrode according to claim 1, characterized in that, The diameter of the welding core is 2.5~4.0mm.

4. A method for preparing a nickel-based welding electrode, characterized in that, The process includes the following steps: mixing the components according to claim 1 evenly to prepare a coating; adding a binder to the coating and stirring evenly to form a coating mixture; pressing the coating mixture onto the surface of the welding core and drying it to obtain the nickel-based welding electrode.

5. The preparation method according to claim 4, characterized in that, The adhesive is a water glass adhesive, and the weight of the adhesive is 20-23% of the total weight of the coating.

6. The preparation method according to claim 4, characterized in that, The weight of the dried coating mixture in the nickel-based welding electrode is 40-45% of the total weight of the nickel-based welding electrode.

7. The preparation method according to claim 4, characterized in that, The pressure during the pressure coating process is 8~12MPa.

8. The preparation method according to claim 4, characterized in that, The drying temperature is 350~380℃, and the drying time is 1~2 hours.

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