A coated stainless steel welding wire and a method of making the same

Abstract

The present application provides a kind of coating stainless steel welding wire and its preparation method, it is related to welding material field, including welding wire matrix and coating, the coating is coated on the outer surface of the welding wire matrix, by the total mass of the coating, the coating includes the following mass percent of raw materials: base oil 70~85%, molybdenum disulfide 2~5%, graphene 0.5~1%, monocrystalline silicon powder 1.5~3%, potassium borate 10~20%, nano titanium dioxide 0.5~1%.The present application provides a kind of coating stainless steel welding wire and its preparation method, the potassium borate in coating, nano titanium dioxide can improve the arc stability in the welding process, reduce the spatter rate;Molybdenum disulfide, graphene can increase the conductivity of welding wire while also can significantly improve the stability of welding wire feeding;Monocrystalline silicon powder can improve the forming state of weld, the final finished product coating stainless steel welding wire has good wire feeding stability, surface coating uniform and dense, arc stable, welding spatter is small, and the weld forming is good.

Description

Technical Field

[0001] This invention relates to the field of welding materials, and more specifically to a coated stainless steel welding wire and its preparation method. Background Technology

[0002] Austenitic stainless steel is the most widely used stainless steel, and gas metal arc welding (GMAW) is one of the main welding methods for austenitic stainless steel. It is widely used in food, transportation, aerospace, petrochemical, and other fields, and has a broad market prospect. However, due to the limitations of current domestic stainless steel welding wire production technology, commercially available GMAW stainless steel welding wires suffer from poor wire feeding stability, poor arc stability, and significant welding spatter during welding, requiring high welder skills and severely limiting their application in practical work. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention provides a coated stainless steel welding wire and its preparation method to improve the technical problem of poor arc stability of stainless steel welding wire during welding.

[0004] To achieve the above and other related objectives, the present invention provides a coated stainless steel welding wire, comprising a welding wire substrate and a coating, wherein the coating is applied to the outer surface of the welding wire substrate, and the coating comprises the following raw materials by mass percentage: 70-85% base oil, 2-5% molybdenum disulfide, 0.5-1% graphene, 1.5-3% monocrystalline silicon powder, 10-20% potassium borate, and 0.5-1% nano-titanium dioxide.

[0005] In one example of the coated stainless steel welding wire of the present invention, the molybdenum disulfide particle size is less than or equal to 0.6 μm.

[0006] In one example of the coated stainless steel welding wire of the present invention, the graphene particle size is 1-5 μm.

[0007] In one example of the coated stainless steel welding wire of the present invention, the nano-titanium dioxide particle size is 10-100 nm.

[0008] In one example of the coated stainless steel welding wire of the present invention, the particle size of the monocrystalline silicon powder is 5-10 μm.

[0009] In one example of the coated stainless steel welding wire of the present invention, the base oil includes silicone oil and kerosene.

[0010] In one example of the coated stainless steel welding wire of the present invention, the mass ratio of the silicone oil to the kerosene is 1:(10-20).

[0011] This invention also provides a method for preparing coated stainless steel welding wire, comprising the following steps:

[0012] Silicone oil and kerosene are mixed at a ratio of 1:(10-20), stirred evenly, and weighed to obtain the base oil;

[0013] Each solid raw material was weighed, dried, and then mixed evenly to obtain the first mixture.

[0014] The first mixture is added to the base oil, heated to 50-70°C, stirred continuously and kept at the temperature for 1-1.5 hours to obtain the coating.

[0015] The coating is applied to the outer surface of the welding wire substrate to obtain the first welding wire.

[0016] The first welding wire is dried with hot air to obtain coated stainless steel welding wire.

[0017] In one example of the preparation method of the coated stainless steel welding wire of the present invention, the welding wire substrate is subjected to rust removal, electrolytic pickling and drying treatment in sequence before the coating is applied.

[0018] In one example of the preparation method of the coated stainless steel welding wire of the present invention, the acid solution for electrolytic pickling is citric acid solution, and the concentration of the citric acid solution is 90-120 g / L.

[0019] In one example of the preparation method of the coated stainless steel welding wire of the present invention, the temperature of the hot air drying is 120±5℃.

[0020] This invention relates to coated stainless steel welding wire and its preparation method. Potassium borate and nano-titanium dioxide in the coating can improve the arc stability and reduce the spatter rate during the welding process; molybdenum disulfide and graphene can increase the conductivity of the welding wire and significantly improve the wire feeding stability; single crystal silicon powder can improve the weld formation state. The final coated stainless steel welding wire has good wire feeding stability, uniform and dense surface coating, stable arc, small welding spatter, and good weld formation. Detailed Implementation

[0021] 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.

[0022] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the present invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, devices, and materials similar to or equivalent to those described, used, or made of materials in the embodiments of this invention.

[0023] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as part of the scope of the invention.

[0024] This invention provides a coated stainless steel welding wire, comprising a welding wire substrate and a coating. The coating is applied to the outer surface of the welding wire substrate. Based on the total mass of the coating, the coating comprises the following raw materials in the following mass percentages: 70-85% base oil, 2-5% molybdenum disulfide, 0.5-1% graphene, 1.5-3% monocrystalline silicon powder, 10-20% potassium borate, and 0.5-1% nano-titanium dioxide. The potassium borate and nano-titanium dioxide can improve arc stability and reduce spatter during welding. The molybdenum disulfide and graphene can increase the conductivity of the welding wire and improve wire feeding stability. The monocrystalline silicon powder can improve the weld formation.

[0025] In one example of the coated stainless steel welding wire of the present invention, the molybdenum disulfide particle size is less than or equal to 0.6 μm, for example, 0.1 μm, 0.3 μm, or 0.6 μm. The graphene particle size is 1–5 μm, for example, 1 μm, 3 μm, 4 μm, or 5 μm. The nano-titanium dioxide particle size is 10–100 nm, for example, 10 nm, 30 nm, 50 nm, 80 nm, or 100 nm. The single-crystal silicon powder particle size is 5–10 μm, for example, 5 μm, 7 μm, 9 μm, or 10 μm.

[0026] In one example of the coated stainless steel welding wire of the present invention, the base oil includes silicone oil and kerosene. The silicone oil and kerosene, when mixed, have good volatility. After hot air drying, the amount of oil residue in the coating is low, which increases the wire feeding stability and reduces dust adsorption by the coating during welding.

[0027] In one example of the coated stainless steel welding wire of the present invention, the mass ratio of silicone oil to kerosene is 1:(10-20). For example, 1:10, 1:13, 1:16, 1:20.

[0028] This invention also provides a method for preparing coated stainless steel welding wire, comprising the following steps:

[0029] Silicone oil and kerosene are mixed at a ratio of 1:(10-20), stirred evenly, and weighed to obtain the base oil;

[0030] Each solid raw material was weighed, dried, and then mixed evenly to obtain the first mixture.

[0031] The first mixture is added to the base oil, heated to 50-70°C, stirred continuously and kept at the temperature for 1-1.5 hours to obtain the coating.

[0032] The coating is applied to the outer surface of the welding wire substrate to obtain the first welding wire.

[0033] The first welding wire is dried with hot air to obtain coated stainless steel welding wire.

[0034] In one example of the preparation method of the coated stainless steel welding wire of the present invention, the welding wire substrate is subjected to rust removal, water washing, electrolytic pickling, water washing and drying treatment in sequence before the coating is applied.

[0035] In one example of the preparation method of the coated stainless steel welding wire of the present invention, the acid solution used for electrolytic pickling is citric acid solution, and the concentration of the citric acid solution is 90-120 g / L. The citric acid activates the surface of the welding wire substrate, which facilitates the subsequent coating and increases the density of the coating.

[0036] In one example of the preparation method of the coated stainless steel welding wire of the present invention, the temperature of the hot air drying is 120±5℃. Hot air drying is the process of evaporating the base oil in the coating, thereby curing the coating.

[0037] Different proportions of the above raw materials can constitute different embodiments. In the embodiments of the present invention, the molybdenum disulfide particle size is 0.4 μm, the graphene particle size is 3 μm, the nano-titanium dioxide particle size is 70 nm, and the single crystal silicon powder particle size is 8 μm. Specific embodiments are shown below:

[0038] Example 1

[0039] The mass percentages of each component in the coating are as follows: base oil 70%, molybdenum disulfide 5%, graphene 1%, monocrystalline silicon powder 3%, potassium borate 20%, and nano titanium dioxide 1%.

[0040] The method for producing coated stainless steel welding wire using the above-mentioned coating materials includes the following steps:

[0041] Mix silicone oil and kerosene at a ratio of 1:10, stir well, and weigh to obtain the base oil;

[0042] Each solid raw material was weighed, dried, and then mixed evenly to obtain the first mixture.

[0043] The first mixture is added to the base oil, heated to 70°C, stirred continuously and kept warm for 1 hour to obtain the coating.

[0044] The coating is applied to the outer surface of the welding wire substrate to obtain the first welding wire.

[0045] The first welding wire was dried with hot air at 120±5℃ to obtain coated stainless steel welding wire.

[0046] Before the coating is applied, the welding wire substrate is electrolytically pickled with 120 g / L citric acid.

[0047] Example 2

[0048] The mass percentages of each component in the coating are as follows: base oil 80%, molybdenum disulfide 3%, graphene 0.5%, monocrystalline silicon powder 1.5%, potassium borate 14%, and nano titanium dioxide 1%.

[0049] The method for producing coated stainless steel welding wire using the above-mentioned coating materials includes the following steps:

[0050] Mix silicone oil and kerosene at a ratio of 1:15, stir well, and weigh to obtain the base oil;

[0051] Each solid raw material was weighed, dried, and then mixed evenly to obtain the first mixture.

[0052] The first mixture is added to the base oil, heated to 50°C, stirred continuously and kept at that temperature for 1.5 hours to obtain the coating.

[0053] The coating is applied to the outer surface of the welding wire substrate to obtain the first welding wire.

[0054] The first welding wire was dried with hot air at 120±5℃ to obtain coated stainless steel welding wire.

[0055] Before the coating is applied, the welding wire substrate is electrolytically pickled with 90 g / L citric acid.

[0056] Example 3

[0057] The mass percentages of each component in the coating are as follows: base oil 85%, molybdenum disulfide 2%, graphene 0.5%, monocrystalline silicon powder 1.5%, potassium borate 10%, and nano titanium dioxide 1%.

[0058] The method for producing coated stainless steel welding wire using the above-mentioned coating materials includes the following steps:

[0059] Silicone oil and kerosene are mixed at a ratio of 1:12, stirred evenly, and weighed to obtain the base oil.

[0060] Each solid raw material was weighed, dried, and then mixed evenly to obtain the first mixture.

[0061] The first mixture is added to the base oil, heated to 60°C, stirred continuously and kept at that temperature for 1.5 hours to obtain the coating.

[0062] The coating is applied to the outer surface of the welding wire substrate to obtain the first welding wire.

[0063] The first welding wire was dried with hot air at 120±5℃ to obtain coated stainless steel welding wire.

[0064] Before the coating is applied, the welding wire substrate is first electrolytically pickled with 100 g / L citric acid.

[0065] Example 4

[0066] The mass percentages of each component in the coating are as follows: base oil 77%, molybdenum disulfide 2%, graphene 0.5%, monocrystalline silicon powder 2%, potassium borate 18%, and nano titanium dioxide 0.5%.

[0067] The method for producing coated stainless steel welding wire using the above-mentioned coating materials includes the following steps:

[0068] Silicone oil and kerosene were mixed at a ratio of 1:13, stirred evenly, and weighed to obtain the base oil.

[0069] Each solid raw material was weighed, dried, and then mixed evenly to obtain the first mixture.

[0070] The first mixture is added to the base oil, heated to 70°C, stirred continuously and kept at this temperature for 1.5 hours to obtain the coating.

[0071] The coating is applied to the outer surface of the welding wire substrate to obtain the first welding wire.

[0072] The first welding wire was dried with hot air at 120±5℃ to obtain coated stainless steel welding wire.

[0073] Before the coating is applied, the welding wire substrate is electrolytically pickled with 110 g / L citric acid.

[0074] Example 5

[0075] The mass percentages of each component in the coating are as follows: base oil 77%, molybdenum disulfide 2%, graphene 0.5%, monocrystalline silicon powder 2%, potassium borate 18%, and nano titanium dioxide 0.5%.

[0076] The method for producing coated stainless steel welding wire using the above-mentioned coating materials includes the following steps:

[0077] Silicone oil and kerosene were mixed at a ratio of 1:13, stirred evenly, and weighed to obtain the base oil.

[0078] Each solid raw material was weighed, dried, and then mixed evenly to obtain the first mixture.

[0079] The first mixture is added to the base oil, heated to 70°C, stirred continuously and kept at this temperature for 1.5 hours to obtain the coating.

[0080] The coating is applied to the outer surface of the welding wire substrate to obtain the first welding wire.

[0081] The first welding wire was dried with hot air at 120±5℃ to obtain coated stainless steel welding wire.

[0082] Before the coating is applied, the welding wire substrate is electrolytically pickled with 110 g / L citric acid.

[0083] The coated stainless steel welding wire of the present invention was subjected to various welding tests on the welding wires obtained in Examples 1 to 5 above, according to relevant standards. The welding process parameters are shown in Table 1 below:

[0084] Table 1 Welding process parameters

[0085]

[0086] The wire feeding resistance of the welding tests in each embodiment is compared in Table 2 below:

[0087] Table 2 Comparison of Wire Feeding Resistance

[0088] Example Minimum value / N Maximum value / N Difference / N Average / N Standard deviation 1 2.83 2.96 0.13 2.88 0.045 2 2.81 3.02 0.21 2.93 0.062 3 2.9 3.10 0.2 2.98 0.061 4 2.85 3.01 0.16 2.92 0.063 5 2.92 3.22 0.3 3.01 0.117 Commercially available welding wire 2.81 3.85 1.04 3.22 0.434

[0089] The spatter rates of the welding tests in each embodiment are compared in Table 3 below:

[0090] Table 3. Comparison of Splash Rates

[0091]

[0092]

[0093] The results of various welding tests show that the coated stainless steel welding wire provided by this invention has high wire feeding stability and low welding spatter rate.

[0094] This invention provides a coated stainless steel welding wire and its preparation method. Potassium borate and nano-titanium dioxide in the coating improve arc stability and reduce spatter during welding. Molybdenum disulfide and graphene increase the wire's conductivity and significantly improve wire feeding stability. Monocrystalline silicon powder improves weld formation. The final coated stainless steel welding wire exhibits good wire feeding stability, a uniform and dense surface coating, stable arc, minimal welding spatter, and good weld formation. Furthermore, the invention uses mechanical rust removal instead of acid pickling and citric acid instead of organic acids in electrolytic pickling, making the production process green and environmentally friendly. Therefore, this invention effectively overcomes some practical problems in the prior art, thus possessing high utilization value and practical significance. The above embodiments are merely illustrative of the principles and effects of this invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in this invention should still be covered by the claims of this invention.

Claims

1. A coated stainless steel welding wire, characterized in that, It includes a welding wire substrate and a coating, wherein the coating is formed by applying a coating material to the outer surface of the welding wire substrate, and the coating material consists of the following materials by mass percentage based on the total mass of the coating material: Base oil 70-85%, molybdenum disulfide 2-5%, graphene 0.5-1%, monocrystalline silicon powder 1.5-3%, potassium borate 10-20%, nano titanium dioxide 0.5-1%; The base oil includes silicone oil and kerosene, and the mass ratio of silicone oil to kerosene is 1:(10-20). The preparation method of coated stainless steel welding wire includes the following steps: Silicone oil and kerosene are mixed in a ratio of 1: (10-20), stirred evenly, and weighed to obtain the base oil; Each solid raw material was weighed, dried, and then mixed evenly to obtain the first mixture. The first mixture is added to the base oil, heated to 50-70°C, stirred continuously and kept at the temperature for 1-1.5 hours to obtain the coating raw material; The coating material is applied to the outer surface of the welding wire substrate to obtain the first welding wire; The first welding wire is dried with hot air to obtain coated stainless steel welding wire.

2. The coated stainless steel welding wire according to claim 1, characterized in that, The molybdenum disulfide particle size is less than or equal to 0.6 μm.

3. The coated stainless steel welding wire according to claim 1, characterized in that, The graphene particles have a diameter of 1–5 μm.

4. The coated stainless steel welding wire according to claim 1, characterized in that, The nano-titanium dioxide particles have a diameter of 10–100 nm.

5. The coated stainless steel welding wire according to claim 1, characterized in that, The particle size of the monocrystalline silicon powder is 5–10 μm.

6. The coated stainless steel welding wire according to claim 1, characterized in that, Before the coating is applied, the welding wire substrate is subjected to rust removal, electrolytic pickling, and drying treatment in sequence.

7. The coated stainless steel welding wire according to claim 6, characterized in that, The acid solution used for electrolytic pickling is citric acid solution, and the concentration of the citric acid solution is 90-120 g / L.

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