A hot-formed high-strength steel welding wire, welding wire coating and processing technology thereof

Abstract

The invention discloses a hot-formed high-strength steel welding wire, a welding wire coating and a processing technology thereof, wherein the components and weight portions of the welding wire coating are: 1 to 1.5 calcium stearate, 1 to 1.5 butyl titanate, 0.8 to 1.2 sodium benzoate, 3 to 4.5 barium dinonylnaphthalene sulfonate, 0.4 to 0.6 dodecenyl succinic acid, 3 to 6 Span‑80, 0.5 to 1.0 lanolin magnesium soap, and 80.5 to 95.5 base oil. The hot-formed high-strength steel welding wire is made by wrapping a welding core formed by hot-formed high-strength steel with a welding wire coating and drying it to form a hot-formed high-strength steel welding wire. The hot-formed high-strength steel welding wire, the welding wire coating and the processing technology thereof comprehensively optimize the welding wire coating formula and the manufacturing process, and cooperate with the hot-formed high-strength steel welding core. The welding wire significantly improves the welding quality and efficiency, and improves the welding performance dedicated to hot-formed high-strength steel.

Description

Technical Field

[0001] The invention relates to a welding wire and a processing technology thereof, in particular to a hot-formed high-strength steel welding wire, a welding wire coating and a processing technology thereof. Background Art

[0002] Traditional welding processes often use copper-plated welding wires, which have a series of problems during welding. First, copper-plated welding wires are prone to rust in a humid environment, affecting welding performance. Secondly, copper-plated welding wires will produce harmful gases during welding, which is harmful to human health and the environment. This is mainly due to the poor high temperature resistance and oxidation resistance of the copper plating layer, as well as the reaction of copper with other elements at high temperatures to generate harmful gases. In addition, in traditional welding processes, the use of iron-manganese alloy welding wires has the problem of unstable weld quality to a certain extent. The melting point and fluidity of iron-manganese alloys at high temperatures are relatively low, which leads to poor deposition performance of welding wires during welding, affecting the formation and quality of welds. The problem of uneven weld metal properties will occur in the iron-manganese alloy welding wire during welding, which is caused by uneven diffusion of alloy elements during welding or inconsistent cooling speed of the molten pool. At the same time, iron-manganese alloy welding wires may produce more pores and inclusions during welding, and these defects will affect the mechanical properties and corrosion resistance of the weld. Therefore, improving the composition of welding wires and optimizing processing technology are crucial to improving weld quality. Summary of the invention

[0003] In order to solve the deficiencies of the above-mentioned technologies, the present invention provides a processing technology for welding wire coating and hot-formed high-strength steel welding wire.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a welding wire coating, the components and weight proportions of the welding wire coating are: 1-1.5 calcium stearate, 1-1.5 butyl titanate, 0.8-1.2 sodium benzoate, 3-4.5 barium dinonylnaphthalene sulfonate, 0.4-0.6 dodecenylsuccinic acid, 3-6 Span-80, 0.5-1.0 lanolin magnesium soap, and 80.5-95.5 base oil.

[0005] Furthermore, the weight proportions of the components of the welding wire coating are: 1-1.2 calcium stearate, 1-1.2 butyl titanate, 0.8-1.0 sodium benzoate, 3-4 barium dinonylnaphthalenesulfonate, 0.4-0.6 dodecenylsuccinic acid, 3-5 Span-80, 0.5-0.8 lanolin magnesium soap, and 80.5-95.5 base oil.

[0006] Furthermore, the weight proportions of the components of the welding wire coating are: 1.2-1.5 calcium stearate, 1.2-1.5 butyl titanate, 0.8-1.2 sodium benzoate, 3-4 barium dinonylnaphthalenesulfonate, 0.4-0.5 dodecenylsuccinic acid, 3-5 Span-80, 0.8-1.0 lanolin magnesium soap, and 80.5-95.5 base oil.

[0007] Furthermore, the weight parts of the components of the welding wire coating are: 1 calcium stearate, 1 butyl titanate, 0.8 sodium benzoate, 3 barium dinonylnaphthalenesulfonate, 0.4 dodecenylsuccinic acid, 3 Span-80, 0.5 lanolin magnesium soap, and 90.3 base oil.

[0008] A welding wire coating processing technology comprises the following steps: adding base oil into a reaction kettle and stirring, adding sodium benzoate and calcium stearate after dehydration at 120°C, and keeping the temperature at this temperature and stirring for 2 hours; cooling to 70°C and then adding barium dinonylnaphthalenesulfonate, dodecenylsuccinic acid, lanolin magnesium soap and butyl titanate, stirring for 1 hour, cooling to 60°C and adding Span-80, and stirring continuously to mix all the materials; cooling to 40°C-50°C while stirring continuously, stirring at a high speed of 1000r / min for 60s, and stirring at a low speed of 100r / min for 60s, taking the upper clarified part after static precipitation.

[0009] A hot-formed high-strength steel welding wire with a welding wire coating prepared using a processing technology is prepared by wrapping a welding core formed by pressing hot-formed high-strength steel with a welding wire coating and drying the resultant.

[0010] Furthermore, the mass percentages of the welding wire coating and the welding core are 10% and 90%.

[0011] The present invention discloses a hot-formed high-strength steel welding wire, welding wire coating and its processing technology. The hot-formed high-strength steel welding wire, welding wire coating and its processing technology comprehensively optimize the welding wire coating formula and manufacturing process, and greatly improve the oxidation resistance, high temperature resistance, corrosion resistance and deposition performance of the welding wire coating through key steps such as high-temperature dehydration treatment, uniform mixing and stirring, and removal of impurities. The uniformity of weld metal performance is enhanced, the generation of pores and inclusions is reduced, and the mechanical properties and corrosion resistance of the weld are ensured. In combination with a hot-formed high-strength steel welding core, this welding wire significantly improves welding quality and efficiency, reduces the generation of harmful gases, and improves the welding performance of hot-formed high-strength steel. It is particularly suitable for high-strength steel application fields such as the automotive industry, aerospace, and building structures, provides better weld quality, reduces welding defects, and improves welding speed and efficiency, while maintaining the strength and corrosion resistance of hot-formed high-strength steel. DETAILED DESCRIPTION

[0012] The technical scheme of the present invention is further described below in conjunction with the examples, but these examples are not intended to limit the present invention. Unless otherwise specified, the reagents, equipment and methods used in the examples are conventional commercially available reagents, equipment and conventional methods in the art.

[0013] Embodiment 1;

[0014] 1. Add 90.3 g of base oil (industrial white oil) into the reactor and stir.

[0015] 2. Heat the reactor to 120°C for dehydration, then add 0.8 g of sodium benzoate and 1 g of calcium stearate, and stir at this temperature for 2 hours.

[0016] 3. Cool down to 70°C, add 3 g barium dinonylnaphthalenesulfonate, 0.4 g dodecenylsuccinic acid, 0.5 g lanolin magnesium soap and 1 g butyl titanate, and stir for 1 hour.

[0017] 4. Cool down to 60℃, add 3g of Span-80, and stir continuously to mix all the materials.

[0018] 5. Cool down to 40℃ while stirring continuously, stir at high speed of 1000r / min for 60 seconds, then stir at low speed of 100r / min for 60 seconds.

[0019] 6. After standing and settling, take the upper clear layer.

[0020] Embodiment 2:

[0021] 1. Add 95.5 g of base oil (industrial white oil) into the reactor and stir.

[0022] 2. Heat the reactor to 120°C for dehydration, then add 1.0 g of calcium stearate and 1.0 g of butyl titanate, and stir at this temperature for 2 hours.

[0023] 3. Cool to 70°C, add 3.75 g barium dinonylnaphthalenesulfonate, 0.5 g dodecenylsuccinic acid, 0.75 g lanolin magnesium soap and 1.0 g sodium benzoate, and stir for 1 hour.

[0024] 4. Cool down to 60℃, add 4.5g Span-80, and stir continuously to mix all the materials.

[0025] 5. Cool down to 50°C while stirring continuously, first stir at a high speed of 1000 r / min for 60 seconds, then stir at a low speed of 100 r / min for 60 seconds.

[0026] 6. After standing and settling, take the upper clear layer.

[0027] Embodiment three;

[0028] 1. Add 80.5 g of base oil (industrial white oil) into the reactor and stir.

[0029] 2. Heat the reactor to 120°C for dehydration, then add 0.8 g of sodium benzoate and 1 g of calcium stearate, and stir at this temperature for 2 hours.

[0030] 3. Cool down to 70°C, add 3 g barium dinonylnaphthalenesulfonate, 0.4 g dodecenylsuccinic acid, 0.5 g lanolin magnesium soap and 1 g butyl titanate, and stir for 1 hour.

[0031] 4. Cool down to 60℃, add 4.5g Span-80, and stir continuously to mix all the materials.

[0032] 5. Cool down to 40℃-50℃ while stirring continuously, first stir at a high speed of 1000r / min for 60 seconds, then stir at a low speed of 100r / min for 60 seconds.

[0033] 6. After standing and settling, take the upper clear layer.

[0034] The above examples show how to prepare a specific welding wire coating according to the component content range of the welding wire coating. In the actual preparation process, it is necessary to adjust according to actual needs and laboratory conditions. The following is the role of each component in the processing technology of the welding wire coating;

[0035] Calcium stearate: Blocks the cathode process. After adding calcium stearate, the corrosion current density decreases rapidly. By blocking the cathode process, the oxidation resistance of the welding wire coating can be improved and the possibility of rusting in a humid environment can be reduced.

[0036] Butyl Titanate: Increases the corrosion resistance of the material and blocks the cathodic and anodic processes; as a corrosion inhibitor, it can improve the high temperature resistance of the welding wire coating and reduce the generation of harmful gases.

[0037] Barium dinonylnaphthalenesulfonate: It is a multi-purpose oil-soluble corrosion inhibitor. It can be added not only to lubricating oil, but also has good corrosion inhibition effect in internal combustion engine oil and special spindle oil. It has a certain ability to resist salt water, has good corrosion inhibition effect on ferrous metals, and has good effect on brass, but slightly worse effect on bronze and copper.

[0038] Dodecenylsuccinic acid: It is a good oil-soluble corrosion inhibitor. Its oil solubility is better than that of alkyl succinic acid. It is a light yellow to brown viscous liquid, insoluble in water, soluble in organic solvents and oil. It has good oil solubility and is relatively stable in oil, and is often used in turbine oil. Its seawater corrosion resistance to copper is better than that of petroleum sulfonates, but its saltwater corrosion resistance to steel is slightly worse, so it is often used in combination with barium petroleum sulfonate; as a multi-purpose oil-soluble corrosion inhibitor, it can improve the corrosion resistance of welding wire coatings and reduce pores and inclusions in welds.

[0039] Span-80: As a solvent and dispersant for corrosion inhibitors; it can improve the processing performance of welding wire coatings and ensure uniform mixing of various components.

[0040] Lanolin magnesium soap: has good anti-rust performance, excellent high and low temperature performance, has dual functions of anti-rust and auxiliary film formation, and has strong adhesion to metals. Its film formation is similar to that of industrial vaseline. (Due to the electron repulsion of the hydroxyl group at the α position, the cloud density of oxygen atoms in the hydroxyl group is higher, and it is easier to form a coordination bond with the metal). At the same time, it has good compatibility with other additives. Adding more than 2% can significantly thicken the oil, and has good corrosion inhibition performance for steel, copper, and aluminum, and has good resistance to moisture and heat and atmospheric corrosion. It can improve the corrosion resistance of welding wire coating and reduce the possibility of rusting in a humid environment.

[0041] Sodium benzoate: It is an anodic corrosion inhibitor. Its working principle is that its anions are adsorbed in the anode area of ​​the electrode reaction to inhibit the anode dissolution of the metal. (What is special is that it also participates in the adsorption process. In addition to γ-Fe2O3, a small amount of benzoate ions are found in the passivation film formed by it as a corrosion inhibitor.) It can improve the oxidation resistance of the welding wire coating and reduce the generation of harmful gases.

[0042] Integrating into the processing technology, dehydration treatment at high temperature can improve the oxidation resistance of the welding wire coating and reduce the possibility of rust in a humid environment. Heat preservation and stirring ensure that the components are evenly mixed and improve the processing performance of the welding wire coating. According to the role of each component, the oxidation resistance, high temperature resistance, corrosion resistance, deposition performance, uniformity of weld metal properties of the welding wire coating can be improved, the formation of pores and inclusions can be reduced, and the mechanical properties and corrosion resistance of the weld can be ensured. During the period, high-speed and low-speed alternating stirring ensures that the components are evenly mixed and improves the processing performance of the welding wire coating. Finally, static precipitation can remove impurities in the welding wire coating and improve the performance of the welding wire coating.

[0043] Through the effects of the above components and the steps of the processing technology, a welding wire coating that can solve the problems in the background technology can be produced. The welding wire coating has excellent oxidation resistance, high temperature resistance, corrosion resistance, deposition performance, uniformity of weld metal properties, reduces the generation of pores and inclusions, ensures the mechanical properties and corrosion resistance of the weld, thereby improving the quality of the weld, reducing the generation of harmful gases, and improving welding performance.

[0044] At the same time, the present invention also discloses a hot-formed high-strength steel welding wire with a welding wire coating prepared by a processing technology, wherein the welding wire coating is wrapped with a welding core formed by pressing hot-formed high-strength steel, and the hot-formed high-strength steel welding wire is made by drying. The mass percentages of the welding wire coating and the welding core are 10% and 90%.

[0045] Hot-formed high-strength steel (22MnB5) is a type of steel used for hot stamping automotive structural parts. Its processing process uses hot stamping technology to directly feed uniformly austenitized red-hot steel plates into molds or tooling with built-in cooling systems, quickly form and quickly cool them, and the cooling rate is greater than 30°C / s. The process of completing the complete martensitic phase transformation can greatly improve the strength. The tensile strength of the final hot-stamped parts can reach more than 1500MPa, which can improve safety performance while reducing weight, and has been maturely applied in the automotive manufacturing industry. The hot stamping process has three steps: ① Heating and insulation to ensure uniform austenitization; ② Rapid stamping or forming to ensure that deformation is completed before phase transformation; ③ Rapid cooling to obtain complete martensitic transformation.

[0046] It should be noted that when the welding wire or welding wire is prepared by the processing technology disclosed in the present invention and is used to weld hot-formed high-strength steel, there are mainly two application scenarios based on the heat treatment state of the hot-formed high-strength steel.

[0047] Application scenario 1: The hot-formed high-strength steel to be welded has not been heat-treated. Before being heated and formed, the tensile strength of the hot-formed high-strength steel that has not been heat-treated is between 500-600Mpa. After the hot-formed high-strength steel is welded using welding rods or welding wires, the whole is heated and formed and quickly cooled. The mechanical properties of the weld area are consistent with those of the parent materials on both sides, that is, the tensile strength can reach more than 1500MPa, and the material structure properties of the parent material and the weld have changed.

[0048] Application scenario two: The hot-formed high-strength steel to be welded on both sides has been heat treated, that is, the tensile strength has reached more than 1500MPa. When welding rods or welding wires are used to weld the hot-formed high-strength steel, the weld is quickly cooled simultaneously, and finally the tensile strength of the base material and the weld can reach more than 1500MPa.

[0049] The above two application scenarios can ultimately achieve hot-formed high-strength steel with high tensile strength. The following are the performance test results of the metal melted and deposited on the surface of Examples 1 and 2. The mechanical properties of the welding wire cladding metal of Example 1 are shown in Table 1, and the mechanical properties of the welding wire cladding metal of Example 2 are shown in Table 2.

[0050] In summary, it can be seen that hot-formed high-strength steel welding wire is made by wrapping a specially formulated welding wire coating on a welding core formed by hot-formed high-strength steel and then drying it. This welding wire combines the characteristics of hot-formed high-strength steel to improve welding quality and efficiency. Improving weld performance, the hot-formed high-strength steel component in the welding wire can improve the mechanical properties of the weld, such as tensile strength, ductility and toughness, which are critical for hot-formed high-strength steel. The combined coating components can help reduce defects such as pores, cracks and inclusions during welding, which can reduce the performance of the weld. Corrosion inhibitors and rust inhibitors in the welding wire coating can help improve the corrosion resistance of the weld, which is particularly important for the application of steel in harsh environments. In general, hot-formed high-strength steel welding wire is optimized for the characteristics of hot-formed high-strength steel, providing better weld quality, reducing welding defects, and improving welding speed and efficiency, while maintaining the strength and corrosion resistance of hot-formed high-strength steel. These characteristics make hot-formed high-strength steel welding wire very suitable for use in the automotive industry, aerospace, building structures and other high-strength steel applications.

[0051] Table 1 Mechanical properties of cladding metal

[0052]

[0053] Table 2 Mechanical properties of cladding metal

[0054]

[0055] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the scope of the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A welding wire coating, characterized in that: The components and weight proportions of the welding wire coating are: 1-1.5 calcium stearate, 1-1.5 butyl titanate, 0.8-1.2 sodium benzoate, 3-4.5 barium dinonylnaphthalenesulfonate, 0.4-0.6 dodecenylsuccinic acid, 3-6 Span-80, 0.5-1.0 lanolin magnesium soap, and 80.5-95.5 base oil.

2. The welding wire coating according to claim 1, characterized in that: The components of the welding wire coating are as follows: 1-1.2 calcium stearate, 1-1.2 butyl titanate, 0.8-1.0 sodium benzoate, 3-4 barium dinonylnaphthalenesulfonate, 0.4-0.6 dodecenylsuccinic acid, 3-5 Span-80, 0.5-0.8 lanolin magnesium soap, and 80.5-95.5 base oil.

3. The welding wire coating according to claim 1, characterized in that: The components of the welding wire coating are as follows: 1.2-1.5 calcium stearate, 1.2-1.5 butyl titanate, 0.8-1.2 sodium benzoate, 3-4 barium dinonylnaphthalenesulfonate, 0.4-0.5 dodecenylsuccinic acid, 3-5 Span-80, 0.8-1.0 lanolin magnesium soap, and 80.5-95.5 base oil.

4. The welding wire coating according to claim 1, characterized in that: The components of the welding wire coating are as follows: 1 part by weight of calcium stearate, 1 part by weight of butyl titanate, 0.8 part by weight of sodium benzoate, 3 part by weight of barium dinonylnaphthalenesulfonate, 0.4 part by weight of dodecenylsuccinic acid, 3 part by weight of Span-80, 0.5 part by weight of lanolin magnesium soap, and 90.3 part by weight of base oil.

5. A process for preparing the welding wire coating according to any one of claims 1 to 4, characterized in that: Add base oil into the reactor and stir. After dehydration at 120°C, add sodium benzoate and calcium stearate, and keep stirring at this temperature for 2 hours; cool to 70°C and then add barium dinonylnaphthalenesulfonate, dodecenylsuccinic acid, lanolin magnesium soap and butyl titanate. After stirring for 1 hour, cool to 60°C and add Span-80, and keep stirring to mix all the materials; cool to 40°C-50°C while stirring continuously, first stir at a high speed of 1000r / min for 60s, then stir at a low speed of 100r / min for 60s, let stand and settle, and take the upper clarified part.

6. A hot-formed high-strength steel welding wire using a welding wire coating prepared by the welding wire coating processing process according to claim 5, characterized in that: The hot-formed high-strength steel welding wire is manufactured by wrapping the welding wire coating with a welding core formed by pressing hot-formed high-strength steel and drying the welding wire.

7. The hot-formed high-strength steel welding wire with welding wire coating prepared by the welding wire coating processing technology according to claim 6, characterized in that: The mass percentages of the welding wire coating and the welding core are 10% and 90%.

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