Environment-friendly wear-resistant flux-cored wire and processing technology thereof

Abstract

The application discloses an environment-friendly wear-resistant flux-cored wire and a processing technology thereof, and relates to the technical field of the flux-cored wire.The flux-cored wire comprises an H08A steel belt sheath and a flux core, and the flux core is composed of the following components in percentage by mass: chromium carbide 5-10%, nano-titanium carbide 1-2%, molybdenum 5-10%, titanium 5-10%, vanadium 2-5%, carbon nanotube-titanium dioxide compound 0.5-1%, fluorine-free slagging agent 2-5%, and the balance of iron; the filling amount of the flux core powder is 30-50% of the total mass of the sheath; and the processing technology comprises raw material treatment, sheath rolling forming and multi-pass wire drawing.The fluorine-free slagging agent can reduce the F content of welding smoke by more than 90%, the components of the flux core can synergistically improve the hardness and wear resistance of the wire, and the welding stability is ensured, so that the application is suitable for the manufacturing and repairing of easily-worn parts in the fields of mine machinery and engineering machinery.

Description

Technical Field

[0001] This invention relates to the field of flux-cored welding wire technology, specifically to an environmentally friendly wear-resistant flux-cored welding wire and its processing technology. Background Technology

[0002] Flux-cored welding wire, as a highly efficient welding material, plays a vital role in industrial applications. Its core use is to form a reinforcing layer on the surface of various wear-resistant parts through a welding process. It is widely used in the manufacturing and repair of easily worn components in mining machinery, construction machinery, metallurgical equipment, and power equipment. By using flux-cored welding wire, the wear resistance, impact resistance, and other mechanical properties of the component surface can be significantly improved, extending the component's service life, reducing equipment maintenance costs, and ensuring the continuity and stability of industrial production.

[0003] Flux-cored welding wire, with its advantages of high welding efficiency and strong controllability of weld performance, has gradually become the mainstream material in the field of wear-resistant component surfacing. However, existing products have three major technical bottlenecks: First, traditional high-chromium system welding wires have chromium pollution problems and are not environmentally friendly enough, failing to meet increasingly stringent environmental protection requirements; second, a single flux-cored structure makes it difficult to balance wear resistance and impact resistance, and the surfacing layer is prone to cracking during the surfacing process, affecting the service life of the welded parts; third, flux-cored component segregation leads to unstable welding performance, and traditional fluoride slagging agents release toxic gases during welding, endangering the health of operators and the environment.

[0004] Therefore, developing an environmentally friendly and highly wear-resistant flux-cored welding wire has become an important research direction in the field. Summary of the Invention

[0005] The purpose of this invention is to provide an environmentally friendly wear-resistant flux-cored welding wire and its processing technology to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An environmentally friendly wear-resistant flux-cored welding wire, comprising a flux core and an outer sheath.

[0007] Furthermore, the composition of the core is as follows (by mass percentage): 5-10% chromium carbide, 1-2% nano-titanium carbide, 5-10% molybdenum, 5-10% titanium, 2-5% vanadium, 0.5-1% carbon nanotube-titanium dioxide composite, 2-5% fluorine-free slagging agent, with the balance being iron.

[0008] Furthermore, the fluorine-free slagging agent is one of calcium carbonate-alumina or calcium oxide-silica; in calcium carbonate-alumina, the mass ratio of calcium carbonate to alumina is (1-2):1; in calcium oxide-silica, the mass ratio of calcium oxide to silica is (1-2):1. The amount of core powder filling is 30-50% of the total mass of the outer casing.

[0009] Furthermore, the outer sheath is made of H08A steel strip.

[0010] Furthermore, the carbon nanotube-titanium dioxide composite was prepared by the following process: (1) Disperse the ball-milled carbon nanotubes in an ethanol-deionized water mixture and sonicate for 2-3 hours to form a carbon nanotube suspension; (2) Mix tetrabutyl titanate with anhydrous ethanol and stir to form solution A; mix deionized water and anhydrous ethanol, adjust the pH to 3-4 to form solution B; add solution A dropwise to solution B at room temperature while stirring for 3-4 hours, and then dry to form titanium dioxide sol; (3) The carbon nanotube suspension was mixed with titanium dioxide sol, and the mixture was ultrasonically dispersed, vacuum filtered and dried to obtain the carbon nanotube-titanium dioxide composite.

[0011] Furthermore, in step (1), the volume ratio of ethanol to deionized water in the ethanol-deionized water mixture is 2:1.

[0012] Furthermore, in step (2), the volume ratio of tetrabutyl titanate to anhydrous ethanol is 1:4; the volume ratio of deionized water to anhydrous ethanol is 1:1; and the volume ratio of solution A to solution B is 1:(1-2). The stirring speed is 300-500 rpm; The drying process conditions are: temperature 80℃, time 18-24h.

[0013] Furthermore, in step (3), the mass ratio of carbon nanotube suspension to titanium dioxide sol is (2-4):1; The ultrasonic dispersion process conditions are: power 800-1200W, time 5-8 hours. A processing technology for an environmentally friendly wear-resistant flux-cored welding wire includes the following steps: S1: Raw material processing Wipe the outer layer with acetone, dry the core components and mix them evenly to obtain core powder; S2: Outer wrapper rolled into shape The processed outer skin is rolled into a U-shaped groove, filled with flux-cored powder, compacted by vibration, and gradually pressed into a closed state. After multiple drawing passes, the flux-cored welding wire is obtained.

[0014] Furthermore, in step S1, the drying process conditions are as follows: after filtering the core component through a 150-mesh sieve, dry it at 130-150℃ for 4-6 hours. The mixing process conditions are: rotation speed 350-450 r / min, time 60-90 min, ultrasonic power 250-300 W, and frequency 20-25 kHz.

[0015] Furthermore, in step S2, the rolling process conditions are: rolling force 35-55kN, rolling speed 6-10m / min; The process conditions for vibration compaction are: amplitude 0.8-1.0 mm, frequency 30-50 kHz, and time 10-20 s; The process conditions for multi-pass drawing are: drawing speed 1.5-2.5m / min, single-pass diameter reduction rate 10-20%, and lubricant used for each drawing pass; The lubricant is a graphite emulsion with a concentration of 8-10%.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention describes an environmentally friendly wear-resistant flux-cored welding wire and its processing technology. The present invention uses a fluorine-free slag-forming agent to replace the traditional fluoride slag-forming agent, which reduces the F content in welding fumes by more than 90%, avoids the harm to the health of operators caused by the toxic gases generated by the high-temperature decomposition of fluorides, and reduces environmental pollution, which fully meets the increasingly stringent industrial environmental protection requirements.

[0017] 2. The present invention describes an environmentally friendly wear-resistant flux-cored welding wire and its processing technology. In the flux core of the present invention, chromium carbide is a highly wear-resistant hard phase, and nano-titanium carbide can refine the grains, fill the gaps, and enhance wear resistance. Titanium and vanadium can form titanium carbide and vanadium carbide with carbon, further improving wear resistance. Molybdenum can enhance the softening resistance of the iron-based matrix under high temperature environment and promote carbide precipitation. Silicon has high oxygen affinity and can preferentially react with free oxygen and metal oxides in the molten pool to generate SiO2, reducing the formation of pores.

[0018] 3. The present invention describes an environmentally friendly wear-resistant flux-cored welding wire and its processing technology. In the carbon nanotube-titanium dioxide composite of the present invention, the titanium dioxide shell forms a physical barrier between the carbon nanotubes, preventing the agglomeration of the carbon nanotubes; at the same time, titanium dioxide can form a stable transition phase with elements such as iron and chromium, such as FeTiO3. This transition phase can fill the interfacial gap between carbon nanotubes, hard phases (chromium carbide, tungsten carbide, etc.) and iron-based matrix; in addition, the carbon nanotube-titanium dioxide composite can form a multi-level structure of "hard phase-FeTiO3-carbon nanotube-iron-based matrix", which enhances the bonding strength. It can also work synergistically with fluorine-free slag-forming agents to adjust the viscosity and fluidity of the slag, avoiding the difficulty of slag removal caused by excessive slag stickiness.

[0019] 4. The present invention describes an environmentally friendly wear-resistant flux-cored welding wire and its processing technology. The flux powder filling amount and processing parameters of the present invention have been precisely optimized, which can effectively reduce the segregation of flux components. Combined with raw material processing steps such as filtration through a 150-mesh sieve and drying at 130-150℃ for 4-6 hours, the uniformity and dryness of the flux powder are further ensured, which ultimately ensures the arc stability and the consistency of the deposited metal properties during welding, and reduces the risk of welding defects caused by composition fluctuations. Detailed Implementation

[0020] 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.

[0021] In the following specific implementation: Chromium carbide: average particle size is 100 μm; Molybdenum: Molybdenum powder with a purity of ≥99.99% and an average particle size of 100μm; Vanadium: Vanadium powder with a purity of ≥99.9% and an average particle size of 100μm; Titanium: Titanium powder, purity ≥99.5%, average particle size 100μm; Iron: Iron powder, purity ≥99.9%, average particle size 100μm; Titanium dioxide and fluorine-free slagging agent are in powder form with an average particle size of 100μm. Nano-titanium carbide: average particle size is 50 nm; Carbon nanotubes: Multi-walled carbon nanotubes are selected, with a length of 3-12 μm, an outer diameter of 8-15 nm, and an inner diameter of 3-5 nm.

[0022] Example 1: An environmentally friendly wear-resistant flux-cored welding wire, comprising a flux core and an outer sheath; The composition of the core is as follows (by mass percentage): 8% chromium carbide, 1.5% nano-titanium carbide, 8% molybdenum, 8% titanium, 4% vanadium, 0.8% carbon nanotube-titanium dioxide composite, 3% fluorine-free slagging agent, and the balance being iron. The fluorine-free slagging agent is calcium oxide-silica, with a mass ratio of calcium oxide to silica of 1:1; The amount of core powder filling is 30% of the total mass of the outer casing; The outer sheath is made of H08A steel strip; The carbon nanotube-titanium dioxide composite was prepared by the following process: (1) The ball-milled carbon nanotubes were dispersed in an ethanol-deionized water mixture and sonicated for 2 hours to form a carbon nanotube suspension; the volume ratio of ethanol to deionized water was 2:1. (2) Mix tetrabutyl titanate and anhydrous ethanol at a volume ratio of 1:4 and stir to form solution A; mix deionized water and anhydrous ethanol at a volume ratio of 1:1 and adjust the pH to 3 to form solution B; add solution A dropwise to solution B at room temperature while stirring at 500 rpm for 3 hours, and then dry at 80°C for 18 hours to form titanium dioxide sol; the volume ratio of solution A to solution B is 1:1; (3) The carbon nanotube suspension and titanium dioxide sol were mixed at a mass ratio of 2:1, ultrasonically dispersed at 800W power for 8h, and then obtained after vacuum filtration and drying. A processing technology for an environmentally friendly wear-resistant flux-cored welding wire includes the following steps: S1: Raw material processing Wipe the outer skin with acetone, filter the core components through a 150-mesh sieve, dry at 150℃ for 4 hours, and then mix at 400 r / min, ultrasonic power 280 W, and frequency 22 kHz for 60 minutes to obtain core powder. S2: Outer wrapper rolled into shape The processed outer skin is rolled into a U-shaped groove, filled with flux-cored powder, and vibrated for 15 seconds at an amplitude of 0.9 mm and a frequency of 40 kHz. The outer skin is then pressed into a closed state and drawn in multiple passes to obtain the flux-cored welding wire. The process conditions for multiple drawing passes are: drawing speed 1.5 m / min, single-pass diameter reduction rate 15%, and lubricant used for each drawing pass. The lubricant is 8% graphite emulsion.

[0023] Example 2: An environmentally friendly wear-resistant flux-cored welding wire, comprising a flux core and an outer sheath; The composition of the core is as follows (by mass percentage): 5% chromium carbide, 1% nano-titanium carbide, 5% molybdenum, 5% titanium, 2% vanadium, 0.5% carbon nanotube-titanium dioxide composite, 2% fluorine-free slagging agent, and the balance being iron. The fluorine-free slagging agent is calcium carbonate-alumina, with a mass ratio of calcium carbonate to alumina of 1:1. The amount of core powder filling is 40% of the total mass of the outer casing; The outer sheath is made of H08A steel strip; The carbon nanotube-titanium dioxide composite was prepared by the following process: (1) The ball-milled carbon nanotubes were dispersed in an ethanol-deionized water mixture and sonicated for 2.5 h to form a carbon nanotube suspension; the volume ratio of ethanol to deionized water was 2:1. (2) Mix tetrabutyl titanate and anhydrous ethanol at a volume ratio of 1:4 and stir to form solution A; mix deionized water and anhydrous ethanol at a volume ratio of 1:1 and adjust the pH to 3.5 to form solution B; add solution A dropwise to solution B at room temperature while stirring at 400 rpm for 3.5 h, and then dry at 80℃ for 20 h to form titanium dioxide sol; the volume ratio of solution A to solution B is 1:1.5; (3) The carbon nanotube suspension and titanium dioxide sol were mixed at a mass ratio of 3:1, ultrasonically dispersed at 900W power for 6h, and then obtained after vacuum filtration and drying. A processing technology for an environmentally friendly wear-resistant flux-cored welding wire includes the following steps: S1: Raw material processing Wipe the outer skin with acetone, filter the core components through a 150-mesh sieve, dry at 130℃ for 6 hours, and then mix at 350 r / min, ultrasonic power 250 W, and frequency 22 kHz for 80 minutes to obtain core powder. S2: Outer skin roll forming The processed outer skin is rolled into a U-shaped groove, filled with flux-cored powder, and vibrated for 20 seconds at an amplitude of 0.8 mm and a frequency of 30 kHz. The outer skin is then pressed into a closed state and drawn through multiple passes to obtain the flux-cored welding wire. The process conditions for multiple drawing passes are: drawing speed 2.0 m / min, single-pass diameter reduction rate 10%, and lubricant used for each drawing pass. The lubricant is a 9% graphite emulsion.

[0024] Example 3: An environmentally friendly wear-resistant flux-cored welding wire, comprising a flux core and an outer sheath; The composition of the core is as follows (by mass percentage): 10% chromium carbide, 2% nano-titanium carbide, 10% molybdenum, 10% titanium, 5% vanadium, 1% carbon nanotube-titanium dioxide composite, 5% fluorine-free slagging agent, and the balance is iron. The fluorine-free slagging agent is calcium oxide-silica, with a mass ratio of calcium oxide to silica of 2:1; The amount of core powder filling is 50% of the total mass of the outer casing; The outer sheath is made of H08A steel strip; The carbon nanotube-titanium dioxide composite was prepared by the following process: (1) The ball-milled carbon nanotubes were dispersed in an ethanol-deionized water mixture and sonicated for 3 hours to form a carbon nanotube suspension; the volume ratio of ethanol to deionized water was 2:1. (2) Mix tetrabutyl titanate and anhydrous ethanol at a volume ratio of 1:4 and stir to form solution A; mix deionized water and anhydrous ethanol at a volume ratio of 1:1 and adjust the pH to 4 to form solution B; add solution A dropwise to solution B at room temperature while stirring at 300 rpm for 4 hours, and then dry at 80°C for 24 hours to form titanium dioxide sol; the volume ratio of solution A to solution B is 1:2; (3) The carbon nanotube suspension and titanium dioxide sol were mixed at a mass ratio of 4:1, ultrasonically dispersed at 1200W power for 5h, and then obtained after vacuum filtration and drying. A processing technology for an environmentally friendly wear-resistant flux-cored welding wire includes the following steps: S1: Raw material processing Wipe the outer skin with acetone, filter the core components through a 150-mesh sieve, dry at 140℃ for 5 hours, and then mix at 450 r / min, ultrasonic power 300 W, and frequency 25 kHz for 90 minutes to obtain core powder. S2: Outer skin roll forming The processed outer skin is rolled into a U-shaped groove, filled with flux-cored powder, and vibrated for 10 seconds at an amplitude of 1.0 mm and a frequency of 50 kHz. The outer skin is then pressed into a closed state and drawn through multiple passes to obtain the flux-cored welding wire. The process conditions for multiple drawing passes are: drawing speed 2.5 m / min, single-pass diameter reduction rate 15%, and lubricant used for each drawing pass. The lubricant is a 10% graphite emulsion.

[0025] Comparative Example 1: Based on Example 1, the core composition was adjusted to change carbon nanotubes-titanium dioxide to carbon nanotubes, including the following steps: An environmentally friendly wear-resistant flux-cored welding wire, comprising a flux core and an outer sheath; The composition of the core is as follows (by mass percentage): 8% chromium carbide, 1.5% nano-titanium carbide, 8% molybdenum, 8% titanium, 4% vanadium, 0.8% carbon nanotube-titanium dioxide composite, 3% fluorine-free slagging agent, and the balance being iron. The fluorine-free slagging agent is calcium oxide-silica, with a mass ratio of calcium oxide to silica of 1:1; The amount of core powder filling is 30% of the total mass of the outer casing; The outer sheath is made of H08A steel strip; A processing technology for an environmentally friendly wear-resistant flux-cored welding wire includes the following steps: S1: Raw material processing Wipe the outer skin with acetone, filter the core components through a 150-mesh sieve, dry at 150℃ for 4 hours, and then mix at 400 r / min, ultrasonic power 280 W, and frequency 22 kHz for 60 minutes to obtain core powder. S2: Outer skin roll forming The processed outer skin is rolled into a U-shaped groove, filled with flux-cored powder, and vibrated for 15 seconds at an amplitude of 0.9 mm and a frequency of 40 kHz. The outer skin is then pressed into a closed state and drawn in multiple passes to obtain the flux-cored welding wire. The process conditions for multiple drawing passes are: drawing speed 1.5 m / min, single-pass diameter reduction rate 15%, and lubricant used for each drawing pass. The lubricant is 8% graphite emulsion.

[0026] Comparative Example 2: Based on Example 1, the core composition was adjusted by changing carbon nanotube-titanium dioxide to titanium dioxide, including the following steps: An environmentally friendly wear-resistant flux-cored welding wire, comprising a flux core and an outer sheath; The composition of the core is as follows (by mass percentage): 8% chromium carbide, 1.5% nano-titanium carbide, 8% molybdenum, 8% titanium, 4% vanadium, 0.8% carbon nanotube-titanium dioxide composite, 3% fluorine-free slagging agent, and the balance being iron. The fluorine-free slagging agent is calcium oxide-silica, with a mass ratio of calcium oxide to silica of 1:1; The amount of core powder filling is 30% of the total mass of the outer casing; The outer sheath is made of H08A steel strip; A processing technology for an environmentally friendly wear-resistant flux-cored welding wire includes the following steps: S1: Raw material processing Wipe the outer skin with acetone, filter the core components through a 150-mesh sieve, dry at 150℃ for 4 hours, and then mix at 400 r / min, ultrasonic power 280 W, and frequency 22 kHz for 60 minutes to obtain core powder. S2: Outer skin roll forming The processed outer skin is rolled into a U-shaped groove, filled with flux-cored powder, and vibrated for 15 seconds at an amplitude of 0.9 mm and a frequency of 40 kHz. The outer skin is then pressed into a closed state and drawn in multiple passes to obtain the flux-cored welding wire. The process conditions for multiple drawing passes are: drawing speed 1.5 m / min, single-pass diameter reduction rate 15%, and lubricant used for each drawing pass. The lubricant is 8% graphite emulsion.

[0027] Comparative Example 3: Based on Example 1, the core composition was adjusted without the addition of carbon nanotubes-titanium dioxide, including the following steps: An environmentally friendly wear-resistant flux-cored welding wire, comprising a flux core and an outer sheath; The composition of the core is as follows (by mass percentage): 8% chromium carbide, 1.5% nano-titanium carbide, 8% molybdenum, 8% titanium, 4% vanadium, 0.8% carbon nanotube-titanium dioxide composite, 3% fluorine-free slagging agent, and the balance being iron. The fluorine-free slagging agent is calcium oxide-silica, with a mass ratio of calcium oxide to silica of 1:1; The amount of core powder filling is 30% of the total mass of the outer casing; The outer sheath is made of H08A steel strip; A processing technology for an environmentally friendly wear-resistant flux-cored welding wire includes the following steps: S1: Raw material processing Wipe the outer skin with acetone, filter the core components through a 150-mesh sieve, dry at 150℃ for 4 hours, and then mix at 400 r / min, ultrasonic power 280 W, and frequency 22 kHz for 60 minutes to obtain core powder. S2: Outer skin roll forming The processed outer skin is rolled into a U-shaped groove, filled with flux-cored powder, and vibrated for 15 seconds at an amplitude of 0.9 mm and a frequency of 40 kHz. The outer skin is then pressed into a closed state and drawn in multiple passes to obtain the flux-cored welding wire. The process conditions for multiple drawing passes are: drawing speed 1.5 m / min, single-pass diameter reduction rate 15%, and lubricant used for each drawing pass. The lubricant is 8% graphite emulsion.

[0028] Experiment: The environmentally friendly wear-resistant flux-cored welding wires prepared in Examples 1-3 and Comparative Examples 1-3 were used for arc welding tests, and the properties of the weld metal were measured. The welding process conditions are as follows: On a Q235B steel plate (350mm×150mm×20mm), welding is performed by flat welding with an arc voltage of 25-28V, a welding current of 180-200A, a welding speed of 25cm / min, and a wire feed speed of 150cm / min. The environmentally friendly wear-resistant flux-cored welding wires prepared in Examples 1-3 and Comparative Examples 1-3 are used to obtain the weld metal. Hardness test: The hardness of the weld metal was tested using an HR-150A Rockwell hardness tester. The load used in the test was 150 kg and the loading time was 10 s. Wear resistance test: The wear test was carried out using an MLS-23 rubber wheel wet sand abrasion tester. The welded metal was made into a 56mm×27mm×11mm sample. The wear parameters were: quartz sand particle size 40-70 mesh, rubber wheel diameter 150mm, rubber wheel speed 240r / min, rubber wheel surface pressure 1.5MPa, and wear time 3min.

[0029] Table 1 Test results of the examples and comparative examples

[0030] Conclusion: The data comparison in the table shows that Examples 1-3, through the synergistic design of the flux-cored components and the precise proportioning of key components, achieved optimization in environmental friendliness, wear resistance, and process performance. Table 1 shows that the flux-cored welding wires prepared in Examples 1-3, when used for welding, produced weld metal hardness of 65-68 HRC and wear of only 0.17-0.18 g. In contrast, the flux-cored welding wires prepared in Comparative Examples 1-3, when used for welding, produced weld metal hardness of 48-55 HRC and wear of 0.30-0.37 g, significantly lower than the examples. Comparative Example 1 is based on Example 1. The core composition was adjusted, and carbon nanotube-titanium dioxide was changed to carbon nanotube. Due to the lack of physical barrier of titanium dioxide shell, carbon nanotube is easy to agglomerate and cannot be uniformly dispersed in the core. It also cannot form FeTiO3 transition phase to fill the interface gap, resulting in a decrease in interface bonding strength. When the prepared core welding wire is used for welding, the hardness and wear resistance of the weld metal are significantly reduced. Comparative Example 2, based on Example 1, adjusted the core composition by replacing carbon nanotube-titanium dioxide with titanium dioxide. Although it could form a FeTiO3 transition phase to fill the interfacial gaps, it lacked the high-strength support and structural reinforcement of carbon nanotubes. It could not construct a multi-level stable structure of "hard phase-transition phase-reinforcing phase-matrix", resulting in limited performance improvement. When the prepared flux-cored welding wire was used for welding, the hardness and wear resistance of the weld metal were significantly reduced. Comparative Example 3 is based on Example 1, but the core composition is adjusted and no carbon nanotubes-titanium dioxide are added. This directly results in the loss of the key functions of anti-agglomeration, interface filling, and structural reinforcement. The internal components of the core are loosely bound, and the hard phase is easy to fall off. When the prepared core welding wire is used for welding, the hardness and wear resistance of the weld metal are significantly reduced. The data from Comparative Examples 1-3 show that the triple effect of the carbon nanotube-titanium dioxide composite in "anti-agglomeration + interfacial bonding + structural enhancement" is the key to achieving high wear resistance and high hardness of welding wire, which cannot be replaced by single carbon nanotubes or titanium dioxide. In summary, this invention, through the technical approach of "pollution reduction by fluorine-free slag-forming agent + structural strengthening by carbon nanotube-titanium dioxide composite + synergistic performance improvement by multiple components," has successfully developed a flux-cored welding wire that is both environmentally friendly and wear-resistant. It can be widely used in the manufacturing and repair of easily worn parts in fields such as mining machinery, engineering machinery, metallurgical equipment, and power equipment. This not only extends the service life of parts and reduces maintenance costs, but also meets the needs of green industrial development, possessing high practical value and promising prospects for industrialization.

[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. An environmentally friendly wear-resistant flux-cored welding wire, characterized in that: Including the core and outer casing; The composition of the core is as follows (by mass percentage): 5-10% chromium carbide, 1-2% nano-titanium carbide, 5-10% molybdenum, 5-10% titanium, 2-5% vanadium, 0.5-1% carbon nanotube-titanium dioxide composite, 2-5% fluorine-free slagging agent, and the balance being iron. The fluorine-free slag-forming agent is one of calcium carbonate-alumina or calcium oxide-silica; The filling amount of the core powder is 30-50% of the total mass of the outer casing; The outer sheath is made of H08A steel strip.

2. The environmentally friendly wear-resistant flux-cored welding wire according to claim 1, characterized in that: The carbon nanotube-titanium dioxide composite was prepared by the following process: (1) Disperse the ball-milled carbon nanotubes in an ethanol-deionized water mixture and sonicate for 2-3 hours to form a carbon nanotube suspension; (2) Mix tetrabutyl titanate with anhydrous ethanol and stir to form solution A; mix deionized water and anhydrous ethanol, adjust the pH to 3-4 to form solution B; add solution A dropwise to solution B at room temperature while stirring for 3-4 hours, and then dry to form titanium dioxide sol; (3) The carbon nanotube suspension was mixed with titanium dioxide sol, and the mixture was ultrasonically dispersed, vacuum filtered and dried to obtain the carbon nanotube-titanium dioxide composite.

3. The processing technology of an environmentally friendly wear-resistant flux-cored welding wire according to any one of claims 1-2, characterized in that: Includes the following steps: S1: Raw material processing Wipe the outer layer with acetone, dry the core components and mix them evenly to obtain core powder; S2: Outer wrapper rolled into shape The processed outer skin is rolled into a U-shaped groove, filled with flux-cored powder, compacted by vibration, and gradually pressed into a closed state. After multiple drawing passes, the flux-cored welding wire is obtained.

4. The processing technology of an environmentally friendly wear-resistant flux-cored welding wire according to claim 3, characterized in that: In step S1, the mixing process conditions are: rotation speed 350-450 r / min, time 60-90 min, ultrasonic power 250-300 W, and frequency 20-25 kHz.

5. The processing technology of an environmentally friendly wear-resistant flux-cored welding wire according to claim 3, characterized in that: In step S2, the vibration compaction process conditions are: amplitude 0.8-1.0 mm, frequency 30-50 kHz, and time 10-20 s.

6. The processing technology of an environmentally friendly wear-resistant flux-cored welding wire according to claim 3, characterized in that: In step S2, the process conditions for the rolls are: rolling force 35-55kN, roll speed 6-10m / min.

7. The processing technology of an environmentally friendly wear-resistant flux-cored welding wire according to claim 3, characterized in that: In step S2, the process conditions for the multi-pass drawing are: drawing speed 1.5-2.5 m / min, single-pass diameter reduction rate 10-20%, and lubricant used for each drawing; the lubricant is a graphite emulsion with a concentration of 8-10%.

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