High-entropy alloy cored wire and method of making same

Abstract

The application relates to the technical field of flux-cored wires, in particular to a high-entropy alloy flux-cored wire and a manufacturing method thereof. The manufacturing method of the high-entropy alloy flux-cored wire comprises the following steps: firstly, solidifying high-entropy alloy powder on the surface of a steel belt by using a laser; secondly, wrapping the solidified high-entropy alloy powder with the steel belt to form a flux-cored wire blank; thirdly, performing multiple times of drawing and reducing the diameter of the flux-cored wire blank to manufacture a finished product with a predetermined specification. Therefore, the flux-cored wire cannot appear empty pipe and powder leakage due to storage and transportation, and the oxidation and moisture absorption of the flux-cored powder can be avoided; meanwhile, the mixing of each component of the high-entropy alloy powder is more stable and uniform, the segregation during welding can be avoided, the spatter generated during welding can be reduced, the electric arc is more stable, the material yield is higher, and the oxygen content in the deposited metal formed by welding is lower and the composition is more uniform.

Description

Technical Field

[0001] This application relates to the field of flux-cored welding wire technology, and in particular to a high-entropy alloy flux-cored welding wire and its manufacturing method. Background Technology

[0002] Flux-cored welding wire, as a high-efficiency and high-quality welding material, is widely used in welding operations in fields such as shipbuilding, bridges, and pressure vessels. Flux-cored welding wire typically uses steel strips to wrap metal powder mixed according to a predetermined formula (i.e., the flux core). However, uneven mixing of the metal powder can lead to segregation during welding; at the same time, the powder is also prone to moisture absorption and oxidation, increasing the probability of defects in the weld metal; furthermore, the powder can cause increased spatter and low yield during welding. Summary of the Invention

[0003] The purpose of this invention is to provide a high-entropy alloy flux-cored welding wire and its manufacturing method, so as to solve to some extent the problems of segregation, large spatter, and low yield caused by uneven powder mixing during the welding process of flux-cored welding wire in the prior art.

[0004] This invention provides a method for manufacturing high-entropy alloy flux-cored welding wire, comprising the following steps: Step 100: Use a laser to solidify high-entropy alloy powder onto the surface of the steel strip; Step 200: Use steel strips to wrap the cured high-entropy alloy powder to form a flux-cored welding wire blank; Step 300: The flux-cored wire blank is drawn and reduced in diameter multiple times to produce a finished flux-cored wire of the predetermined specifications.

[0005] Further, in step 100, the mass fraction of each element in the high-entropy alloy powder is: Cr: 50%~60%, C: 50%~60%, Mn: 1.0%~2.0%, Si: 0.8%~1.2%, B: 0.3%~0.5%, Fe: 30%~40%, the sum of the mass percentages of the above components is 100%.

[0006] Furthermore, in step 100, each component of the high-entropy alloy powder is a single-element powder; Alternatively, the high-entropy alloy powder may consist of high-carbon ferrochrome powder, silicon-manganese alloy powder, and boron carbide powder.

[0007] Further, in step 100, each component of the high-entropy alloy powder is weighed according to a predetermined ratio, and the components are mixed and then solidified on the surface of the steel strip.

[0008] Furthermore, in step 100, each component of the high-entropy alloy powder is weighed according to a predetermined ratio, and each component is cured on the surface of the steel strip in a single pass using multiple laser machines.

[0009] Furthermore, in step 100, the steel strip is a low-carbon steel strip or a 430 stainless steel strip; The width of the steel strip is 12mm~20mm, and the thickness of the steel strip is 0.2mm~1mm.

[0010] Furthermore, the laser has a coaxial powder feeding function.

[0011] Furthermore, the laser power of the laser is 500W~1000W, the diameter of the formed spot is 1.2mm~2mm, and the scanning speed is 2m / min~5m / min.

[0012] Furthermore, the diameter of the flux-cored wire blank obtained in step 200 is 4.0 mm; In step 300, the flux-cored wire blank is passed sequentially through drawing dies with diameters of 3.2 mm, 2.8 mm, 2.0 mm, and 1.6 mm.

[0013] The present invention also provides a high-entropy alloy flux-cored welding wire, which is manufactured by the high-entropy alloy flux-cored welding wire manufacturing method described in any of the above claims.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The method for manufacturing high-entropy alloy flux-cored welding wire provided by the present invention includes the following steps: First, high-entropy alloy powder is solidified on the surface of a steel strip using a laser; next, the solidified high-entropy alloy powder is wrapped in the steel strip to form a flux-cored welding wire blank; next, the flux-cored welding wire blank is drawn and reduced in diameter multiple times to produce a finished flux-cored welding wire of a predetermined specification.

[0015] Therefore, in manufacturing flux-cored welding wire, this application first employs a solid-state forming process, using a laser to solidify the high-entropy alloy powder used as the flux core onto the surface of a steel strip, and then wraps the flux core with the steel strip to form the flux-cored welding wire. By solidifying the flux core powder, the flux-cored welding wire is prevented from developing empty tubes or powder leakage due to storage or transportation, avoiding oxidation and moisture absorption of the flux core powder. Simultaneously, it ensures a more stable and uniform mixture of the components constituting the high-entropy alloy powder, preventing segregation during welding and reducing spatter during welding, resulting in a more stable arc and higher yield. Furthermore, it also results in a lower oxygen content and more uniform composition in the weld metal.

[0016] The present invention also provides a high-entropy alloy flux-cored welding wire, which is manufactured by the aforementioned high-entropy alloy flux-cored welding wire manufacturing method. Therefore, the high-entropy alloy flux-cored welding wire also has the beneficial effects of the high-entropy alloy flux-cored welding wire manufacturing method. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic flowchart illustrating the method for manufacturing high-entropy alloy flux-cored welding wire according to an embodiment of the present invention; Figure 2 This is a schematic diagram from a first-view perspective of one method for solidifying high-entropy alloy powder in the high-entropy alloy flux-cored wire manufacturing method provided in this embodiment of the invention. Figure 3 This is a schematic diagram of a flux-cored wire blank formed by a solidification method of high-entropy alloy powder in the high-entropy alloy flux-cored wire manufacturing method provided in the embodiments of the present invention; Figure 4 A schematic diagram from a second perspective of one of the curing methods of high-entropy alloy powder in the entropy alloy flux-cored wire manufacturing method provided in the embodiment of the present invention. Figure 5 This is a schematic diagram from a first-view perspective of another curing method of high-entropy alloy powder in the high-entropy alloy flux-cored wire manufacturing method provided in the embodiments of the present invention. Figure 6 This is a schematic diagram of a flux-cored wire blank formed by another curing method of high-entropy alloy powder in the high-entropy alloy flux-cored wire manufacturing method provided in the embodiments of the present invention; Figure 7 This is a schematic diagram from a second perspective of another curing method of high-entropy alloy powder in the high-entropy alloy flux-cored wire manufacturing method provided in the embodiments of the present invention. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0021] 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.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The following reference Figures 1 to 7 This application describes a high-entropy alloy flux-cored welding wire and its manufacturing method according to some embodiments.

[0025] This application provides a method for manufacturing high-entropy alloy flux-cored welding wire, such as... Figure 1 As shown, it includes the following steps: Step 100: Use a laser to solidify high-entropy alloy powder onto the surface of the steel strip (e.g., Figure 2 and Figure 4 (as shown) Step 200: Use steel strips to wrap the cured high-entropy alloy powder to form a flux-cored welding wire blank (e.g. Figure 3 (as shown) Step 300: The flux-cored wire blank is drawn and reduced in diameter multiple times to produce a finished flux-cored wire of the predetermined specifications.

[0026] In the fabrication of flux-cored welding wire, this application first employs a solid-state forming process, using a laser to solidify high-entropy alloy powder, which will serve as the flux core, onto the surface of a steel strip. The flux core is then wrapped with the steel strip to form the welding wire. This solidification of the flux core powder prevents issues such as empty tubes or powder leakage during storage and transportation, avoiding oxidation and moisture absorption of the powder. Simultaneously, it ensures a more stable and uniform mixture of the components of the high-entropy alloy powder, preventing segregation during welding and reducing spatter, resulting in a more stable arc and higher yield. Furthermore, it leads to a lower oxygen content and more uniform composition in the weld metal.

[0027] In one embodiment of this application, preferably, in step 100, the high-entropy alloy powder comprises the following elements: chromium (Cr), carbon (C), manganese (Mn), silicon (Si), boron (B), and iron (Fe), wherein the mass fraction of Cr is 50%~60%, the mass fraction of C is 50%~60%, the mass fraction of Mn is 1.0%~2.0%, the mass fraction of Si is 0.8%~1.2%, the mass fraction of B is 0.3%~0.5%, and the mass fraction of Fe is 30%~40%, and the sum of the mass percentages of the above components is 100%.

[0028] For example, high-entropy alloy powder includes 55% Cr, 6% C, 1.5% Mn, 1.0% Si, 0.4% B, and 36.1% Fe. This results in flux-cored welding wire with high strength, good toughness, and corrosion resistance.

[0029] In this embodiment, preferably, in step 100, the high-entropy alloy powder includes multiple components, which are single-element powders such as Cr powder, C powder, Mn powder, Si powder, B powder, and Fe powder; or, the multiple components include high-carbon ferrochrome powder, silicon-manganese alloy powder, and boron carbide powder, thereby effectively reducing costs.

[0030] In this embodiment, preferably, as follows: Figure 2 and Figure 4 As shown, the specific process of step 100 is as follows: weigh the components of the high-entropy alloy powder according to the required proportions, mix the components, and then solidify them onto the surface of the steel strip using a laser. Then, step 200 is performed to obtain the desired result. Figure 3 The flux-cored wire blank shown.

[0031] Specifically, the laser is a laser with coaxial powder feeding function. During the curing process, the laser is suspended above the steel belt, and the steel belt can move relative to the laser along the length of the steel belt, so that the laser feeds the powder to the surface of the steel belt along the length of the steel belt and cures the powder on the surface of the steel belt.

[0032] Or, such as Figures 5 to 7As shown, the specific process of step 100 involves using multiple lasers to perform single-channel curing of each component on the steel strip surface. That is, multiple lasers are set up one-to-one for each component, with each laser used to cure one component. This effectively ensures that the proportions of each component are uniform and consistent at each cross-section of the finished flux-cored wire, thus effectively avoiding segregation during welding. Then, step 200 is performed to obtain the desired result. Figure 6 The flux-cored wire blank shown.

[0033] Specifically, such as Figure 7 As shown, multiple lasers are all lasers with coaxial powder feeding function, and each laser machine is equipped with a component; multiple lasers are sequentially suspended above the steel belt along the length direction of the steel belt, and then the steel belt is moved relative to the lasers along the length direction of the steel belt, and each laser delivers powder to the surface of the steel belt and cures it.

[0034] It should be noted that flux-cored wires processed in this way will have some areas (specifically at the beginning of curing) with incomplete high-entropy alloy powder composition during the curing stage. Therefore, after the flux-cored wire blank is drawn and reduced to the required size, the areas with incomplete high-entropy alloy powder composition at the end need to be removed to obtain the finished flux-cored wire.

[0035] Furthermore, when arranging multiple lasers, they can be staggered along the width of the steel strip. For example, as... Figure 5 As shown, when the high-entropy alloy powder comprises six components, six lasers are sequentially arranged along the length of the steel strip. The first three lasers are staggered by a predetermined distance along the width of the steel strip to form three curing strips on the steel strip. These three curing strips are staggered along the width of the steel strip, and adjacent curing strips overlap. Then, the next two lasers are also staggered along the width of the steel strip to form two curing strips above the three curing strips formed by the first three lasers. These two curing strips are staggered along the width of the steel strip and overlap. Finally, the last laser forms the last curing strip above the two curing strips formed by the first two lasers. This ensures that each component of the high-entropy alloy powder is cured on the surface of the steel strip, resulting in uniform and consistent composition across each cross-section after processing into the finished flux-cored welding wire.

[0036] In this embodiment, preferably, the laser power of the laser is 500W~1000W, the diameter of the formed spot is 1.2mm~2mm, and the scanning speed is 2m / min~5m / min. Thus, the laser machine can efficiently and stably deliver high-entropy alloy powder to the surface of the steel strip for curing.

[0037] In this embodiment, preferably, the steel strip is a low-carbon steel strip or a 430 stainless steel strip, with a width of 12mm to 20mm and a thickness of 0.2mm to 1mm. For example, the steel strip may have a width of 14mm and a thickness of 0.3mm; or a width of 16.5mm and a thickness of 0.6mm.

[0038] In this embodiment, preferably, the diameter of the flux-cored wire blank obtained in step 200 is 4.0 mm. More preferably, in step 300, the flux-cored wire blank is passed sequentially through drawing dies with diameters of 3.2 mm, 2.8 mm, 2.0 mm, and 1.6 mm to obtain a finished flux-cored wire with a diameter of 1.6 mm.

[0039] Table 1 compares the performance of high-entropy alloy flux-cored wire supported by the method of this application with that of ordinary flux-cored wire, solid wire and stranded wire.

[0040] Table 1

[0041] In comparison, the high-entropy alloy flux-cored welding wire prepared by the method of this application can have higher hardness, higher wear resistance, higher carbide content in the weld metal, lower oxygen content in both the welding wire and the weld metal, and higher yield.

[0042] This application also provides a high-entropy alloy flux-cored welding wire, which is manufactured by the high-entropy alloy flux-cored welding wire manufacturing method of any of the above embodiments. Therefore, the high-entropy alloy flux-cored welding wire has all the beneficial effects of the high-entropy alloy flux-cored welding wire manufacturing method, which will not be described in detail here.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for manufacturing a high-entropy alloy flux-cored welding wire, characterized in that, Includes the following steps: Step 100: Use a laser to solidify high-entropy alloy powder onto the surface of the steel strip; Step 200: Use steel strips to wrap the cured high-entropy alloy powder to form a flux-cored welding wire blank; Step 300: The flux-cored wire blank is drawn and reduced in diameter multiple times to produce a finished flux-cored wire of the predetermined specifications.

2. The method for manufacturing high-entropy alloy flux-cored welding wire according to claim 1, characterized in that, In step 100, the mass fraction of each element in the high-entropy alloy powder is as follows: Cr: 50%~60%, C: 50%~60%, Mn: 1.0%~2.0%, Si: 0.8%~1.2%, B: 0.3%~0.5%, Fe: 30%~40%, the sum of the mass percentages of the above components is 100%.

3. The method for manufacturing high-entropy alloy flux-cored welding wire according to claim 2, characterized in that, In step 100, each component of the high-entropy alloy powder is a single-element powder; Alternatively, the high-entropy alloy powder may consist of high-carbon ferrochrome powder, silicon-manganese alloy powder, and boron carbide powder.

4. The method for manufacturing high-entropy alloy flux-cored welding wire according to claim 2, characterized in that, In step 100, each component of the high-entropy alloy powder is weighed according to a predetermined ratio, and the components are mixed and then solidified on the surface of the steel strip.

5. The method for manufacturing high-entropy alloy flux-cored welding wire according to claim 2, characterized in that, In step 100, each component of the high-entropy alloy powder is weighed according to a predetermined ratio, and each component is cured on the surface of the steel strip in a single pass by multiple laser machines.

6. The method for manufacturing high-entropy alloy flux-cored welding wire according to claim 1, characterized in that, In step 100, the steel strip is a low-carbon steel strip or a 430 stainless steel strip. The width of the steel strip is 12mm~20mm, and the thickness of the steel strip is 0.2mm~1mm.

7. The method for manufacturing high-entropy alloy flux-cored welding wire according to claim 1, characterized in that, The laser has a coaxial powder feeding function.

8. The method for manufacturing high-entropy alloy flux-cored welding wire according to claim 1, characterized in that, The laser power of the laser is 500W~1000W, the diameter of the formed spot is 1.2mm~2mm, and the scanning speed is 2m / min~5m / min.

9. The method for manufacturing high-entropy alloy flux-cored welding wire according to claim 1, characterized in that, The diameter of the flux-cored wire blank obtained in step 200 is 4.0 mm; In step 300, the flux-cored wire blank is passed sequentially through drawing dies with diameters of 3.2 mm, 2.8 mm, 2.0 mm, and 1.6 mm.

10. A high-entropy alloy flux-cored welding wire, characterized in that, It is manufactured by the method for manufacturing high-entropy alloy flux-cored welding wire according to any one of claims 1 to 9.

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