Method for producing wire rod for welding wire, method for producing welding wire

Abstract

This application provides a method for producing wire rod and welding wire. The method for producing wire rod includes the following sequential steps for a square billet: a heating step, in which the square billet is passed through a preheating section, a heating section, and a soaking section, with the preheating section temperature controlled at 820~870℃, the heating section temperature at 950~1000℃, and the soaking section temperature at 1000~1040℃, for a total heating time of 70~90 minutes; a rolling step, in which the heated square billet is subjected to rough rolling, intermediate rolling, and finish rolling to obtain wire rod, with the finish rolling inlet temperature controlled at ≤850℃, the rolling speed controlled at 100~110m / s, and the wire drawing temperature controlled at 780~810℃; and a cooling step, in which the cooling rate is controlled at ≤0.6℃ / s after wire drawing, and the wire rod is cooled to 500~550℃. The wire rod production method provided by this application results in wire rods with small-sized microstructures, which is beneficial for drawing, and uniform mechanical properties within the same coil, as well as uniform oxide layer thickness, which is beneficial for descaling.

Description

Technical Field

[0001] This application relates to the field of iron and steel smelting technology, and in particular to a method for producing high-uniformity, low-spatter welding wire and a method for producing wire rods for welding wire. Background Technology

[0002] Traditional welding wires (such as ER70S-6) often suffer from uneven material properties due to insufficient process control during production. Specifically, the tensile strength fluctuates significantly along the length (typically with a difference exceeding 100 MPa), easily leading to problems such as poor wire feeding and arc stability. Furthermore, the oxide scale on the surface of the rolled wire is difficult to remove completely, and the residual dense oxide layer, such as Fe2SiO4, easily causes spatter during welding, with spatter rates generally exceeding 8%, severely impacting welding quality and the operating efficiency of automated equipment. Especially in high-precision scenarios such as robotic welding, these defects lead to poor weld formation, frequent adjustments to process parameters, and significantly increased production costs. While existing technologies attempt to improve uniformity through annealing or adjusting the drawing process, annealing is costly, and excessively high conventional drawing compression ratios (>10%) can cause internal stress concentration in the material, further exacerbating performance fluctuations. Therefore, there is an urgent need for a welding wire and its preparation method that balances high uniformity, low spatter, and suitability for high-speed production. Summary of the Invention

[0003] The purpose of this application is to provide a method for producing wire rods for welding, which solves the problem that it is difficult to achieve high uniformity, low spatter, and high-speed production simultaneously in the prior art.

[0004] To achieve one of the aforementioned objectives, one embodiment of this application provides a method for producing welding wire rod, comprising the following sequential steps performed on a blank.

[0005] In the heating process, the billet passes through the preheating section, the heating section, and the soaking section in sequence. The temperature of the preheating section is controlled at 820~870℃, the temperature of the heating section is 950~1000℃, and the temperature of the soaking section is 1000~1040℃. The total heating time is 70~90min.

[0006] The rolling process involves rough rolling, intermediate rolling, and finish rolling of the heated billet to obtain wire rod. The entry temperature of the finish rolling is controlled to be ≤850℃, the rolling speed is controlled to be 100~110m / s, and the wire drawing temperature is controlled to be 780~810℃.

[0007] Cooling process: After spinning, control the cooling rate to ≤0.6℃ / s and cool the wire rod to 500~550℃.

[0008] In one embodiment of this application, during the cooling process, after the wire rod is cooled to 500~550°C, it is sent into an insulated corridor to continue cooling to below 300°C. The cooling rate of the wire rod in the insulated corridor is greater than the cooling rate of the wire rod before it reaches 500~550°C after spinning.

[0009] In one embodiment of this application, after the wire is produced in the rolling process, the wire rod advances at a speed of 0.9~1.1m / s in the cooling process, and the temperature difference between the same coil of wire rod does not exceed 50℃.

[0010] In one embodiment of this application, the total thickness of the oxide layer on the surface of the wire rod is 5~10μm, wherein the FeO layer thickness accounts for not less than 50% of the total oxide layer thickness.

[0011] In one embodiment of this application, the wire rod has a tensile strength of 450~500MPa and a reduction of area of ​​≥80%.

[0012] This application also provides a method for producing welding wire, comprising the following sequential steps performed on a blank.

[0013] In the heating process, the billet passes through the preheating section, the heating section, and the soaking section in sequence. The temperature of the preheating section is controlled at 820~870℃, the temperature of the heating section is 950~1000℃, and the temperature of the soaking section is 1000~1040℃. The total heating time is 70~90min.

[0014] The rolling process involves rough rolling, intermediate rolling, and finish rolling of the heated billet to obtain wire rod. The entry temperature of the finish rolling is controlled to be ≤850℃, the rolling speed is controlled to be 100~110m / s, and the wire drawing temperature is controlled to be 780~810℃.

[0015] Cooling process: After spinning, control the cooling rate to ≤0.6℃ / s and cool the wire rod to 500~550℃;

[0016] Drawing process: After cooling, no heat treatment is performed. The drawing speed is controlled at ≥25m / s and the drawing is performed directly. The average compression ratio of rough drawing is ≤5% and the average compression ratio of fine drawing is ≤7%.

[0017] In one embodiment of this application, after the wire rod is drawn into welding wire, a coating is applied to the surface of the welding wire. The components of the coating, by mass percentage, include: 8-12% polyvinyl alcohol, 1-3% sodium polyacrylate, 2-4% nanocellulose, 1-3% sodium molybdate, 7-12% graphite, 5-8% graphene, and the balance being water.

[0018] In one embodiment of this application, a weld metal test is performed on the welding wire, and the welding spatter rate is 2-5%.

[0019] In one embodiment of this application, the tensile strength of the weld is ≥430MPa, the impact strength at -40℃ is ≥100J, and the difference in tensile strength within a 100m length of the welding wire is ≤30MPa.

[0020] In one embodiment of this application, the chemical composition of the weld metal, by mass percentage, includes: C: 0.05~0.07%, Si: 0.40~0.60%, Mn: 1.10~1.45%, Al≤0.008%, Ca≤0.0010%, Mg≤0.0003%, Ti≤0.003%, with the remainder being iron and unavoidable impurities.

[0021] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0022] The method for producing welding wire rod provided in this application refines the austenite grains through gradient temperature-controlled heating, multi-pass rolling, and temperature-controlled cooling, resulting in smaller microstructure dimensions after rolling and cooling, which is beneficial for drawing. At the same time, it effectively reduces the thickness of the oxide layer, improves the mechanical properties of the wire rod and the uniformity of the oxide layer thickness, makes the oxide layer easier to remove, and reduces the welding spatter rate. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This application provides a method for producing welding wire rod, comprising the following sequential steps performed on a blank.

[0025] In the heating process, the billet passes through the preheating section, the heating section, and the soaking section in sequence. The temperature of the preheating section is controlled at 820~870℃, the temperature of the heating section is 950~1000℃, and the temperature of the soaking section is 1000~1040℃. The total heating time is 70~90min.

[0026] The rolling process involves rough rolling, intermediate rolling, and finish rolling of the heated billet to obtain wire rod. The entry temperature of the finish rolling is controlled to be ≤850℃, the rolling speed is controlled to be 100~110m / s, and the wire drawing temperature is controlled to be 780~810℃.

[0027] Cooling process: After spinning, control the cooling rate to ≤0.6℃ / s and cool the wire rod to 500~550℃.

[0028] Heating ensures austenite homogenization and reduces grain boundary segregation; it also prevents coarse austenite from forming martensite during cooling, which could lead to wire breakage during drawing. Controlling a lower finishing mill inlet temperature refines the grains and improves surface quality, while controlling a reasonable rolling speed ensures uniform microstructure in both the core and surface of the billet.

[0029] After rolling, the wire rod is formed by spinning. The spinning temperature is controlled to ensure that the wire rod has a uniform shape. The cooling rate is also coordinated to ensure that the cooling is stopped at the aforementioned final cooling temperature (500~550℃) at this cooling rate. This allows the austenite sufficient time to undergo phase transformation and avoids the austenite not having enough time to transform into martensite due to the increased cooling rate after the cooling is stopped if the final cooling temperature is too high.

[0030] Cooling is achieved using the Steilmo cooling line, with all insulation covers on the Steilmo cooling line closed to control a slower cooling rate.

[0031] After the Stellmore cooling process, the wire rod is coiled and sent into the insulated corridor for further cooling. Since the space in the insulated corridor is much larger than the space inside the insulation hood on the Stellmore cooling line, the cooling rate of the wire rod in the insulated corridor is greater than that on the Stellmore cooling line, by about 2~3℃ / s. In the insulated corridor, the temperature of the wire rod is reduced to below 300℃.

[0032] By combining the aforementioned rolling speed and coiling temperature, the thickness of the oxide layer can be effectively reduced, while improving the mechanical properties of the wire rod and the uniformity of the oxide layer thickness.

[0033] In one embodiment of this application, the billet undergoes 6 passes of rough rolling, 6 passes of intermediate rolling, 4 passes of pre-finish rolling, and 10 passes of finish rolling.

[0034] Furthermore, after the wire is produced in the rolling process, the forward speed of the wire rod is 0.9~1.1m / s, and the temperature difference between the same coil of wire rod does not exceed 50℃.

[0035] The Steyrmo cooling line has a certain length, and controlling the speed of the rollers on the Steyrmo cooling line, i.e., the forward speed of the wire rod, ensures the cooling rate and final cooling temperature of the wire rod. After rolling and spinning, the wire rod is formed into concentric layers and moves forward under the drive of the rollers on the Steyrmo cooling line. Controlling the temperature difference within the same concentric layer of the wire rod ensures uniformity and avoids large differences in the microstructure between the front and back of the wire rod.

[0036] In one embodiment of this application, the total thickness of the oxide layer on the surface of the wire rod is 5~10μm, wherein the FeO layer thickness accounts for not less than 50% of the total oxide layer thickness.

[0037] The total thickness of the oxide layer is relatively low, which facilitates peeling. When peeling off the oxide layer, since the FeO layer accounts for a large proportion of the total oxide layer thickness, the Fe2SiO4 between the FeO layer and the wire rod matrix can be peeled off along with the FeO.

[0038] In one embodiment of this application, the tensile strength of the wire rod is 450~500MPa and the reduction of area is ≥80%.

[0039] This application also provides a method for producing welding wire, comprising the following sequential steps performed on a blank.

[0040] In the heating process, the billet passes through the preheating section, the heating section, and the soaking section in sequence. The temperature of the preheating section is controlled at 820~870℃, the temperature of the heating section is 950~1000℃, and the temperature of the soaking section is 1000~1040℃. The total heating time is 70~90min.

[0041] The rolling process involves rough rolling, intermediate rolling, and finish rolling of the heated billet to obtain wire rod. The entry temperature of the finish rolling is controlled to be ≤850℃, the rolling speed is controlled to be 100~110m / s, and the wire drawing temperature is controlled to be 780~810℃.

[0042] Cooling process: After spinning, control the cooling rate to ≤0.6℃ / s and cool the wire rod to 500~550℃;

[0043] Drawing process: After cooling, no heat treatment is performed. The drawing speed is controlled at ≥25m / s and the drawing is performed directly. The average compression ratio of rough drawing is ≤5% and the average compression ratio of fine drawing is ≤7%.

[0044] The welding wire is produced by drawing the wire rod obtained by the aforementioned wire rod production method. Therefore, the heating, rolling, and cooling processes are the same as those in the aforementioned wire rod production method for welding wire.

[0045] The wire rod is drawn rapidly without heat treatment, avoiding the grain coarsening caused by heat treatment such as annealing. Through multiple passes of coarse and fine drawing, and by controlling a low compression ratio, the welding wire becomes more uniform.

[0046] Furthermore, before drawing, a two-way peeling wheel combined with two abrasive belts is used to remove oxide scale, reducing welding spatter caused by incomplete oxide scale removal.

[0047] In one embodiment of this application, after the wire rod is drawn into welding wire, a coating is applied to the surface of the welding wire. The components of the coating, by mass percentage, include: 8-12% polyvinyl alcohol, 1-3% sodium polyacrylate, 2-4% nanocellulose, 1-3% sodium molybdate, 7-12% graphite, 5-8% graphene, and the balance being water.

[0048] Polyvinyl alcohol, sodium polyacrylate, and nanocellulose fibers are used as the binder matrix, and sodium molybdate, graphite, and graphene are added to improve lubricity and conductivity, further reducing splashing.

[0049] In one embodiment of this application, a weld metal deposition test was performed on the welding wire, and the welding spatter rate was 2-5%. The weld metal deposition test was conducted according to standard GB / T 39281-2020. After each welding pass, metal spatter particles around the weld were collected and their weight (A, kg) was measured. The welding material consumed during the welding process (B, kg) was calculated using the formula: A / B × 100%. It should be noted that during welding, a baffle was used to shield the weld area to prevent metal spatter particles from flying too far and being missed, which would result in a lower calculated welding spatter rate.

[0050] Furthermore, the weld has a tensile strength ≥430MPa, an impact strength ≥100J at -40℃, a tensile strength difference ≤30MPa within a 100m length of welding wire, and the welding wire uniformity is more than 3 times better than ER70S-6. It also features excellent wire feeding stability, a stable welding arc, a significantly reduced spatter rate (≤5%), and good slag peeling properties, making it particularly suitable for fields with stringent requirements for process consistency, such as robotic automated welding.

[0051] In one embodiment of this application, the chemical composition of the aforementioned welding wire rod and welding wire, by mass percentage, includes: C: 0.05~0.07%, Si: 0.50~0.70%, Mn: 1.0~1.7%, Al≤0.008%, Ca≤0.0010%, Mg≤0.0003%, Ti≤0.003%, with the remainder being iron and unavoidable impurities.

[0052] In one embodiment of this application, the chemical composition of the weld metal, by mass percentage, includes: C: 0.05~0.07%, Si: 0.40~0.60%, Mn: 1.10~1.45%, Al≤0.008%, Ca≤0.0010%, Mg≤0.0003%, Ti≤0.003%, with the remainder being iron and unavoidable impurities.

[0053] The technical solution of this application will be further described below with reference to some specific embodiments.

[0054] Example 1

[0055] Heating: The billet is passed through the preheating section (820℃), the heating section (950℃), and the soaking section (1000℃) in sequence, with a total heating time of 70 minutes.

[0056] Rolling: The billet undergoes 6 roughing passes, 6 intermediate passes, 4 pre-finishing passes, and 10 finishing passes (finishing entry temperature 850℃) to finally form φ5.5mm wire rod. The rolling speed is 100m / s and the wire drawing temperature is 780℃.

[0057] Cooling: The Stellmore cooling line operates at a roller speed of 0.9 m / s, cooling to 500°C at a rate of 0.6°C / s. The coils are then wound and cooled to 250°C in an insulated corridor. After cooling, the wire rod has a tensile strength of 450 MPa, a reduction in area of ​​80%, and a total oxide layer thickness of 5 μm (FeO layer accounting for 50%).

[0058] Surface treatment: The oxide scale is completely removed by using a two-way peeling wheel combined with two sanding belts.

[0059] Drawing: Unannealed drawing, at a speed of 25 m / s, with an average compression ratio of 4% for rough drawing and 6% for fine drawing.

[0060] Coating preparation: Prepare a coating solution by mass percentage (8% polyvinyl alcohol, 1% sodium polyacrylate, 2% nanocellulose fiber, 1% sodium molybdate, 7% graphite, 5% graphene, with the balance being water), and apply it evenly to the surface of the welding wire.

[0061] Example 2

[0062] Heating: The billet is passed through the preheating section (850℃), the heating section (980℃), and the soaking section (1030℃) in sequence, with a total heating time of 80 minutes.

[0063] Rolling: Finishing mill inlet temperature 840℃, rolling speed 105m / s, wire drawing temperature 800℃, and other passes are allocated in the same way as in Example 1.

[0064] Cooling: The Stellmore cooling line operates at a roller speed of 1.0 m / s, cooling to 530°C at a rate of 0.5°C / s. The coils are then wound and cooled to 280°C in an insulated corridor. After cooling, the wire rod has a tensile strength of 470 MPa, a reduction in area of ​​85%, and a total oxide layer thickness of 5 μm (FeO layer accounting for 50%).

[0065] Surface treatment: After treatment with a two-way peeling wheel, two rounds of sanding are performed to ensure that the oxide scale removal rate is ≥99%.

[0066] Drawing: Unannealed drawing, at a speed of 28 m / s, with an average compression ratio of 3% for rough drawing and 5% for fine drawing.

[0067] Coating preparation: Prepare a coating solution by mass percentage (polyvinyl alcohol 10%, sodium polyacrylate 2%, nanocellulose fiber 3%, sodium molybdate 2%, graphite 10%, graphene 7%, balance water), and coat it evenly on the surface of the welding wire.

[0068] Example 3

[0069] Heating: The billet is passed through the preheating section (870℃), the heating section (1000℃), and the soaking section (1040℃) in sequence, with a total heating time of 90 minutes.

[0070] Rolling: Finishing mill inlet temperature 820℃, rolling speed 110m / s, wire drawing temperature 810℃, and other passes are allocated in the same way as in Example 1.

[0071] Cooling: The Stellmore cooling line operates at a roller speed of 1.1 m / s, cooling to 550°C at a cooling rate of 0.4°C / s. The coils are then wound and cooled to 300°C in an insulated corridor. After cooling, the wire rod has a tensile strength of 505 MPa, a reduction in area of ​​82%, and a total oxide layer thickness of 10 μm (60% FeO layer).

[0072] Surface treatment: After treatment with a bidirectional peeling wheel, two passes of abrasive belt grinding are performed to ensure that the surface roughness is ≤0.5μm.

[0073] Drawing: Unannealed drawing, at a speed of 30 m / s, with an average compression ratio of 5% for rough drawing and 7% for fine drawing.

[0074] Coating preparation: Prepare a coating solution by mass percentage (polyvinyl alcohol 12%, sodium polyacrylate 3%, nanocellulose fiber 4%, sodium molybdate 3%, graphite 12%, graphene 8%, balance water), and coat it evenly on the surface of the welding wire.

[0075] Example 4

[0076] Heating: The billet is passed through the preheating section (830℃), the heating section (960℃), and the soaking section (1020℃) in sequence, with a total heating time of 75 minutes.

[0077] Rolling: Finishing mill inlet temperature 830℃, rolling speed 108m / s, wire drawing temperature 790℃, and other passes are allocated as in Example 1.

[0078] Cooling: The Stellmore cooling line operates at a roller speed of 1.0 m / s, cooling to 520°C at a cooling rate of 0.55°C / s, then coils and enters an insulated corridor for further cooling to 270°C. After cooling, the wire rod has a tensile strength of 490 MPa, a reduction of area of ​​80%, and a total oxide layer thickness of 7 μm (FeO layer accounts for 52%).

[0079] Surface treatment: After treatment with a two-way peeling wheel, two rounds of abrasive belt polishing are performed to improve the surface smoothness.

[0080] Drawing: Unannealed drawing at a speed of 26 m / s, with an average compression ratio of 4.5% for rough drawing and 6.5% for fine drawing.

[0081] Coating preparation: Prepare a coating solution by mass percentage (9% polyvinyl alcohol, 1.5% sodium polyacrylate, 2.5% nanocellulose fiber, 1.5% sodium molybdate, 9% graphite, 6% graphene, with the balance being water), and apply it evenly to the surface of the welding wire.

[0082] Example 5

[0083] Heating: The billet is passed through the preheating section (840℃), the heating section (990℃), and the soaking section (1035℃) in sequence, with a total heating time of 85 minutes.

[0084] Rolling: Finishing mill inlet temperature 845℃, rolling speed 107m / s, wire drawing temperature 805℃, and other passes are allocated in the same way as in Example 1.

[0085] Cooling: The Stellmore cooling line operates at a roller speed of 1.05 m / s, cooling to 540°C at a cooling rate of 0.45°C / s. The coils are then wound and cooled to 290°C in an insulated corridor. After cooling, the wire rod has a tensile strength of 484 MPa, a reduction in area of ​​83%, and a total oxide layer thickness of 9 μm (FeO layer accounting for 58%).

[0086] Surface treatment: After treatment with a two-way peeling wheel, two rounds of sanding with belt sanders are performed, combined with high-precision sanding with belt sanders.

[0087] Drawing: Unannealed drawing at a speed of 27 m / s, with an average compression ratio of 4.8% for rough drawing and 6.8% for fine drawing.

[0088] Coating preparation: Prepare a coating solution by mass percentage (polyvinyl alcohol 11%, sodium polyacrylate 2.5%, nanocellulose fiber 3.5%, sodium molybdate 2.5%, graphite 11%, graphene 7.5%, balance water), and coat it evenly on the surface of the welding wire.

[0089] The welding wires obtained in Examples 1-5 were subjected to weld metal tests and mechanical property tests according to standard GB / T 39281-2020. The welding current was 300±30A, the voltage was 29±2V, and the welding heat input was 13kJ / cm. The composition of the weld metal was analyzed using ICP and CS instruments. The results are shown in Table 1, and the mechanical properties are shown in Table 2. For the finished welding wire of each example, 100m of continuous wire was randomly selected and divided into 400 tensile samples, each 0.25m long. The maximum tensile strength Rm of these 400 tensile samples was then calculated. max and minimum tensile strength Rm min And calculate the difference ΔRm=Rm max -Rm min .

[0090] After each welding pass, collect the metal spatter particles around the weld and measure their weight A (kg). The welding material consumed during the welding process is B (kg). The spatter rate is calculated using the formula = A / B × 100%. The statistical results of the spatter rate and the mechanical property test results are shown in Table 2.

[0091] Table 1 Chemical composition (%) of Examples 1-5

[0092]

[0093] Table 2. Splashing rate, mechanical properties, and uniformity of Examples 1-5

[0094]

[0095] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0096] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A method for producing welding wire, characterized in that, The chemical composition of the welding wire, by mass percentage, includes: C: 0.05~0.07%, Si: 0.50~0.70%, Mn: 1.0~1.7%, Al≤0.008%, Ca≤0.0010%, Mg≤0.0003%, Ti≤0.003%, with the remainder being iron and unavoidable impurities; The production method includes the following steps performed sequentially on the billet. In the heating process, the billet passes through the preheating section, the heating section, and the soaking section in sequence. The temperature of the preheating section is controlled at 820~870℃, the temperature of the heating section is 950~1000℃, and the temperature of the soaking section is 1000~1040℃. The total heating time is 70~90min. The rolling process involves rough rolling, intermediate rolling, and finish rolling of the heated billet to obtain wire rod. The entry temperature of the finish rolling mill is controlled to be ≤850℃, the rolling speed is controlled to be 100~110m / s, and the wire drawing temperature is controlled to be 780~810℃. Cooling process: After spinning, control the cooling rate to ≤0.6℃ / s, the forward speed to 0.9~1.1m / s, and the temperature difference within the same coil of the wire rod to not exceed 50℃. Cool the wire rod to 500~550℃; and the total thickness of the oxide layer on the surface of the wire rod should be 5~10μm, of which the FeO layer thickness accounts for not less than 50% of the total oxide layer thickness. Drawing process: After cooling, no heat treatment is performed. The drawing speed is controlled at ≥25m / s and the drawing is performed directly. The average compression ratio of rough drawing is ≤5% and the average compression ratio of fine drawing is ≤7%. The wire rod obtained after the cooling process has a tensile strength of 450~500MPa and a section reduction rate of ≥80%. The tensile strength difference of the welding wire obtained after the drawing process within a 100m length range is ≤30MPa.

2. The method for producing welding wire according to claim 1, characterized in that, During the cooling process, after the wire rod is cooled to 500~550℃, it is sent into an insulated corridor to continue cooling to below 300℃. The cooling rate of the wire rod in the insulated corridor is greater than the cooling rate of the wire rod before it reaches 500~550℃ after spinning.

3. The method for producing welding wire according to claim 1, characterized in that, After the wire rod is drawn into welding wire, a coating is applied to the surface of the welding wire. The coating consists of the following components by mass percentage: 8-12% polyvinyl alcohol, 1-3% sodium polyacrylate, 2-4% nanocellulose, 1-3% sodium molybdate, 7-12% graphite, 5-8% graphene, and the balance being water.

4. The method for producing welding wire according to claim 1, characterized in that, The weld metal deposition test was performed on the welding wire, and the welding spatter rate was 2-5%.

5. The method for producing welding wire according to claim 4, characterized in that, The tensile strength of the weld is ≥430MPa, and the impact strength at -40℃ is ≥100J.

6. The method for producing welding wire according to claim 4, characterized in that, The chemical composition of the weld metal, by mass percentage, includes: C: 0.05~0.07%, Si: 0.40~0.60%, Mn: 1.10~1.45%, Al≤0.008%, Ca≤0.0010%, Mg≤0.0003%, Ti≤0.003%, with the remainder being iron and unavoidable impurities.

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