Roller die drawing coating welding wire and preparation method and application thereof

Abstract

The invention discloses a roller die drawing coating welding wire and a preparation method and application thereof. The invention belongs to the technical field of welding materials. The technical problems that in the current automatic welding process, splashing is large, electric arcs are not stable, and a contact tube is prone to being blocked are solved. The method comprises the following steps: heating plant-based ester oil, adding a composite nano additive, a solid lubricant, carbon black, MoS2 and nano CuO, and uniformly mixing to obtain a nano coating mixture; wherein the composite nano additive is prepared from nano aluminum oxide, nano titanium dioxide and nano graphene; and coating the nano coating mixture on a welding wire substrate through a coating machine, drying after coating, and carrying out on-line steam heating curing to obtain the coated welding wire. The method is used for preparing the stainless steel welding wire and the nickel-based alloy welding wire.

Description

Technical Field

[0001] The invention belongs to the technical field of welding materials, and in particular relates to a roller die drawn coated welding wire and a preparation method and application thereof. Background Art

[0002] Steel wire drawing technology has a history of development of hundreds of years. Although this technology has been widely developed and applied in recent decades, there are still some problems that need to be studied in depth. At present, steel wire production enterprises generally adopt the fixed die drawing method, but this method has problems such as friction between the contact surface of the die and the deformed metal and the accompanying thermal effect. These problems affect the quality of the steel wire product after drawing, increase the drawing force and energy consumption, accelerate the wear of the die, affect the shape, size and quality of the metal, and thus affect the welding processability of the steel wire. Therefore, how to avoid large spatter, unstable arc, easy clogging of the conductive nozzle, etc. during the welding process of the welding wire, which affects the welding processability and weld quality, is an urgent problem to be solved in this field. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problems of large spatter, unstable arc and easy clogging of conductive nozzle in the current automated welding process, and to provide a roller die drawn coated welding wire and its preparation method and application.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] One of the purposes of the present invention is to provide a method for preparing a roller die drawn coated welding wire, the method being carried out according to the following steps:

[0006] S1, heating the plant-based ester oil, and then adding a composite nano-additive, a solid lubricant, carbon black, MoS2 and nano-CuO to mix well to obtain a nano-coating mixture; wherein the composite nano-additive is composed of nano-alumina, nano-titanium dioxide and nano-graphene;

[0007] S2, rough drawing the wire rod by roller die drawing, followed by bright annealing under hydrogen protection, and then fine drawing by roller die drawing, followed by electrolytic pickling, and fine drawing by fixed die drawing to the finished product diameter after pickling to obtain the welding wire matrix;

[0008] S3: The nano-coating mixture is coated on the welding wire substrate by a coating machine, and after coating, it is dried and cured by online steam heating to obtain a coated welding wire.

[0009] It is further defined that the plant-based ester oil in S1 is soybean oil or sunflower oil.

[0010] It is further defined that the mass proportions of the components of the nano-coating mixture in S1 are as follows: plant-based ester oil 50-70%, composite nano-additives 3.5-13%, solid lubricant 5%-15%, carbon black 3%-15%, MoS2 2%-6%, and nano-CuO 0.1%-1%.

[0011] It is further defined that the mass ratio of nano-alumina, nano-titanium dioxide and nano-graphene in the composite nano-additive in S1 is (3-8): (0.2-2): (0.3-3).

[0012] It is further defined that the diameter of nano-titanium dioxide in S1 is 10 to 60 nm, the diameter of nano-aluminum oxide is 30 to 80 nm, the diameter of nano-graphene is 5 to 40 nm, and the diameter of nano-CuO is 10 to 50 nm.

[0013] It is further defined that the solid lubricant in S1 is graphene or polytetrafluoroethylene.

[0014] It is further defined that in S2, roller pulling is used to draw the wire rod from 5.5 mm to 2.5 mm, the bright annealing temperature is 800-850°C, the wire speed is 6-8 m / min, and after bright annealing, it is continued to be drawn to 1.4 mm, and fixed die drawing is used to draw it to 1.2 mm through 1 pass.

[0015] It is further defined that the thickness of the coating on the surface of the welding wire obtained in S3 is 0.2 to 50 μm, preferably 0.5 to 2 μm.

[0016] A second object of the present invention is to provide a coated welding wire prepared according to the above method.

[0017] The third object of the present invention is to provide an application of the above method in the preparation of stainless steel welding wire and nickel-based alloy welding wire.

[0018] It is further defined that the welding wire material includes but is not limited to ER2209, ER308L and ERNiCrMo-10.

[0019] A fourth object of the present invention is to provide a coated welding wire prepared by the above method for use in automated welding.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention improves the stability of the welding arc and reduces the wear of the conductive tip by introducing nanographene into the welding wire coating. The coating thickness can be adjusted within the range of 0.2 to 50 μm, preferably 0.5 to 2 μm, which provides more adjustment space for the performance optimization of the welding wire.

[0022] The present invention optimizes the surface effect of composite nano additives by selecting the components and regulating the content of nano additives, so that they can more effectively form a protective film when contacting the surface, reducing wear. And its chemical activity helps to form a thin film that is easy to shear on the friction surface. At the same time, it is easier to strike an arc and the arc is more stable. In addition, it is easier to adsorb to the scratches or micro-pits on the friction surface, and the friction surface is filled and repaired by the friction chemical reaction products, further reducing wear. Therefore, the present invention improves the performance of the welding wire by adjusting the optimal ratio of nano additives. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The probability density distribution of welding current and arc voltage of the welding wire in Example 1;

[0024] Figure 2 The probability density distribution of welding current and arc voltage of the welding wire in Example 2;

[0025] Figure 3 The probability density distribution of welding current and arc voltage of the welding wire in Example 3;

[0026] Figure 4 The probability density distribution of welding current and arc voltage of the welding wire in the comparative example;

[0027] Figure 5 The welding current and arc voltage waveforms of the welding wire in Example 1;

[0028] Figure 6 The welding current and arc voltage waveforms of the welding wire in Example 2;

[0029] Figure 7 The welding current and arc voltage waveforms of the welding wire in Example 3;

[0030] Figure 8 The welding current and arc voltage waveforms of the welding wire are compared. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents, methods and instruments used are conventional materials, reagents, methods and instruments in the art unless otherwise specified, and can be obtained through commercial channels by those skilled in the art.

[0033] The terms "comprising," "including," "having," "containing," or any other variations thereof, as used in the following examples, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus comprising the listed elements is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.

[0034] When equivalent, concentration or other value or parameter is represented by the range limited by range, preferred range or a series of upper preferred value and lower preferred value, this should be understood as specifically disclosing all ranges formed by any pairing of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether the scope is disclosed separately. For example, when disclosing range "1 to 5", described range should be interpreted as including range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When numerical range is described in this article, unless otherwise stated, the scope is intended to include its end value and all integers and fractions within the scope. In the present application specification and claims, range limitation can be combined and / or interchanged, if these ranges are not otherwise stated, include all sub-ranges contained therein.

[0035] The indefinite articles "a" and "an" before the elements or components of the present invention have no limitation on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the quantity obviously refers to the singular form only.

[0036] The "one embodiment" or "embodiment" of the present invention refers to a specific feature, structure or characteristic that can be included in at least one implementation of the present invention. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0037] The endpoints and any values ​​of the ranges disclosed in the invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in this article.

[0038] Embodiment 1:

[0039] The preparation method of the roller die drawn coated welding wire of this embodiment is carried out according to the following steps:

[0040] (1) Weigh 70% soybean oil, 4% nano-alumina (60nm), 1% nano-titanium dioxide (10nm), 2.5% nano-graphene (10nm), 5% graphene, 15% carbon black, 22% MoS, and 0.5% nano-CuO (30nm) by mass.

[0041] Nano-alumina, nano-titanium dioxide and nano-graphene were added to 100 mL of anhydrous ethanol, ball-milled for 60 minutes, dried and sieved to obtain a composite nano-additive.

[0042] The plant-based ester oil is heated to 70° C., and then the composite nano-additive, graphene, carbon black, MoS2 and nano-CuO are added and mixed to obtain a mixture for a nano-coating.

[0043] (2) The ER2209 wire rod is drawn from 5.5 mm to 2.5 mm by roller die drawing, and then bright annealing is performed under hydrogen protection, the bright annealing temperature is 850°C, the wire speed is 7 m / min, and the wire rod is further drawn from 2.5 mm to 1.4 mm by roller die drawing, followed by electrolytic pickling, the pickling liquid is a sulfuric acid solution containing DW-019 welding wire electrolytic pickling accelerator, the sulfuric acid concentration in the sulfuric acid solution is 240 g / L, the mass of DW-019 is 5% of the mass of sulfuric acid, the wire feed speed is 5.5 m / s, and the electrolytic current is 4 A / dm 2 After electrolytic pickling, the wire is drawn from 1.4 mm to 1.2 mm in one pass using a fixed die. Finally, online cleaning is performed to obtain the welding wire matrix.

[0044] (3) The nano-coating mixture is coated on the welding wire substrate by a coating machine, and after coating, it is dried and cured by online steam heating to obtain a coated welding wire with a coating thickness of 0.5 μm.

[0045] Embodiment 2:

[0046] The preparation method of the roller die drawn coated welding wire of this embodiment is carried out according to the following steps:

[0047] (1) Weigh 65% sunflower oil, 3% nano-alumina (30nm), 1% nano-titanium dioxide (60nm), 1% nano-graphene (20nm), 8% graphene, 15% carbon black, 26% MoS, and 1% nano-CuO (20nm) by mass.

[0048] Nano-alumina, nano-titanium dioxide and nano-graphene were added to 100 mL of anhydrous ethanol, ball-milled for 60 minutes, dried and sieved to obtain a composite nano-additive.

[0049] The plant-based ester oil is heated to 70° C., and then the composite nano-additive, graphene, carbon black, MoS2 and nano-CuO are added and mixed to obtain a mixture for a nano-coating.

[0050] (2) The ER2209 wire rod is drawn from 5.5 mm to 2.5 mm by roller die drawing, and then bright annealing is performed under hydrogen protection, the bright annealing temperature is 850°C, the wire speed is 7 m / min, and the wire rod is further drawn from 2.5 mm to 1.4 mm by roller die drawing, followed by electrolytic pickling, the pickling liquid is a sulfuric acid solution containing DW-019 welding wire electrolytic pickling accelerator, the sulfuric acid concentration in the sulfuric acid solution is 240 g / L, the mass of DW-019 is 5% of the mass of sulfuric acid, the wire feed speed is 5.5 m / s, and the electrolytic current is 4 A / dm 2 After electrolytic pickling, the wire is drawn from 1.4 mm to 1.2 mm in one pass using a fixed die. Finally, online cleaning is performed to obtain the welding wire matrix.

[0051] (3) The nano-coating mixture is coated on the welding wire substrate by a coating machine, and after coating, it is dried and cured by online steam heating to obtain a coated welding wire with a coating thickness of 0.5 μm.

[0052] Embodiment 3:

[0053] The preparation method of the roller die drawn coated welding wire of this embodiment is carried out according to the following steps:

[0054] (1) Weigh 55% sunflower oil, 6% nano-alumina (45nm), 2% nano-titanium dioxide (20nm), 3% nano-graphene (40nm), 15% graphene, 12% carbon black, 26% MoS, and 1% nano-CuO (10nm) by mass.

[0055] Nano-alumina, nano-titanium dioxide and nano-graphene were added to 100 mL of anhydrous ethanol, ball-milled for 60 minutes, dried and sieved to obtain a composite nano-additive.

[0056] The plant-based ester oil is heated to 70° C., and then the composite nano-additive, graphene, carbon black, MoS2 and nano-CuO are added and mixed to obtain a mixture for a nano-coating.

[0057] (2) The ER2209 wire rod is drawn from 5.5 mm to 2.5 mm by roller die drawing, and then bright annealing is performed under hydrogen protection, the bright annealing temperature is 850°C, the wire speed is 7 m / min, and the wire rod is further drawn from 2.5 mm to 1.4 mm by roller die drawing, followed by electrolytic pickling, the pickling liquid is a sulfuric acid solution containing DW-019 welding wire electrolytic pickling accelerator, the sulfuric acid concentration in the sulfuric acid solution is 240 g / L, the mass of DW-019 is 5% of the mass of sulfuric acid, the wire feed speed is 5.5 m / s, and the electrolytic current is 4 A / dm 2 After electrolytic pickling, the wire is drawn from 1.4 mm to 1.2 mm in one pass using a fixed die. Finally, online cleaning is performed to obtain the welding wire matrix.

[0058] (3) The nano-coating mixture is coated on the welding wire substrate by a coating machine, and after coating, it is dried and cured by online steam heating to obtain a coated welding wire with a coating thickness of 0.5 μm.

[0059] Taking the ER2209 welding wire without nano coating as a comparative example, the coated welding wire prepared in the above embodiment and the comparative example without nano coating were subjected to a process performance comparison test, and the welding specification parameters are shown in Table 1:

[0060] Table 1 Welding specification parameters

[0061]

[0062] The wire feedability, arc stability and conductive nozzle wear performance of the nano-coated welding wire and the non-nano-coated welding wire of each embodiment of the present invention under the same welding specification are studied. The welding wire diameter is 1.2 mm, the welding test plate size is 300 mm×50 mm×20 mm, the base material is Q235, the shielding gas is 95% Ar+5% CO2, and the welding is flat.

[0063] Process performance evaluation criteria:

[0064] Wire feedability: The wire feed resistance method is used to evaluate the wire feedability. The average wire feed resistance of the welding wire is tested during continuous welding for 1 minute. An average wire feed resistance of ≤ 20N is defined as excellent wire feedability; an average wire feed resistance of 21-80N is defined as good wire feedability; an average wire feed resistance of > 80N is defined as poor wire feedability.

[0065] Wear rate of the conductive tip W (%): Calculation formula W = (A1-A2) / A1, A1: original weight of the conductive tip, A2: weight of the conductive tip after welding. Wear rate ≤ 10% is defined as excellent; wear rate 11% to 20% is defined as good; wear rate > 20% is defined as poor;

[0066] Arc stability: The arc stability of the embodiments and comparative examples was evaluated using an arc analyzer. The results are as follows: Figure 1-8 As shown, the results are rated as excellent, good, or poor.

[0067] Figure 1-Figure 4 The probability distribution of welding current and arc voltage of welding wire in the embodiment and comparative example during welding is compared; as can be seen from the figure, the current and voltage distribution of embodiments 2 and 3 are more concentrated, followed by embodiment 1, and the comparative example has the widest distribution. Figure 5-Figure 8 The welding current and arc voltage waveforms of the welding wires of the embodiment and the comparative example are compared. It can be seen from the figure that the current fluctuation is embodiment 2 < embodiment 3 < embodiment 1 < comparative example; the voltage fluctuation is embodiment 2 < embodiment 3 and embodiment 1 < comparative example. From the above results, it can be seen that the arc stability of embodiment 2 and embodiment 3 is the best; the arc stability of embodiment 1 is good; the arc stability of the comparative example is poor.

[0068] The process performance comparison results are shown in Table 2:

[0069] Table 2 Process performance results

[0070] serial number Example 1 Example 2 Example 3 Comparative Example Wire diameter 1.2 1.2 1.2 1.2 Wire feedability excellent good good Difference Arc stability good excellent excellent Difference Contact nozzle wear rate / % 4 8 17 26

[0071] It can be seen from the process performance comparison shown in Table 2 that: compared with the comparative example, the nano-coated welding wire of the present invention exhibits excellent wire feedability and arc stability, and the wear problem of the conductive nozzle is also significantly improved.

[0072] In summary, it can be seen that the present invention successfully prepares a high-alloy welding wire with excellent welding performance through a specific coating composition and preparation method, providing better wire feedability, arc stability and low conductive nozzle wear rate.

[0073] The above are only preferred specific embodiments of the present invention, which are all different implementations based on the overall concept of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for preparing a roller die drawn coated welding wire, characterized in that: The method: S1, heating the plant-based ester oil, and then adding a composite nano-additive, a solid lubricant, carbon black, MoS2 and nano-CuO to mix well to obtain a nano-coating mixture; wherein the composite nano-additive is composed of nano-alumina, nano-titanium dioxide and nano-graphene; S2, rough drawing the wire rod by roller die drawing, followed by bright annealing under hydrogen protection, and then fine drawing by roller die drawing, followed by electrolytic pickling, and fine drawing by fixed die drawing to the finished product diameter after pickling to obtain the welding wire matrix; S3: The nano-coating mixture is coated on the welding wire substrate by a coating machine, and after coating, it is dried and cured by online steam heating to obtain a coated welding wire.

2. The method according to claim 1, characterized in that The plant-based ester oil in S1 is soybean oil or sunflower oil.

3. The method according to claim 1, characterized in that: The mass proportions of the components of the nano-coating mixture in S1 are as follows: 50% to 70% of plant-based ester oil, 3.5% to 13% of composite nano-additives, 5% to 15% of solid lubricants, 3% to 15% of carbon black, 2% to 6% of MoS2, and 0.1% to 1% of nano-CuO.

4. The method according to claim 1, characterized in that: The mass ratio of nano-alumina, nano-titanium dioxide and nano-graphene in the composite nano-additive in S1 is (3-8): (0.2-2): (0.3-3).

5. The method according to claim 1, characterized in that The solid lubricant in S1 is graphene or polytetrafluoroethylene.

6. The method according to claim 1, characterized in that In S2, roller pulling is used to draw the wire rod from 5.5 mm to 2.5 mm, the bright annealing temperature is 800-850°C, the wire speed is 6-8 m / min, and after bright annealing, it is continued to be drawn to 1.4 mm, and fixed die drawing is used to draw it to 1.2 mm through one pass.

7. The method according to claim 1, characterized in that The thickness of the coating on the surface of the welding wire obtained by S3 is 0.2 to 50 μm.

8. A coated welding wire obtained by the method according to any one of claims 1 to 7.

9. Use of the method according to any one of claims 1 to 7 in the preparation of stainless steel welding wire and nickel-based alloy welding wire.

10. Use of the coated welding wire prepared by the method according to any one of claims 1 to 7 in automated welding.

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