Core-spun silver-copper-zinc welding wire, production method and core-spun equipment

Abstract

The problem that liquid scaling powder is filled in an existing core-spun welding wire, and consequently distribution is not uniform is solved. The invention provides a core-spun silver-copper-zinc welding wire, a production method and core-spun equipment, and the silver-copper-zinc welding wire comprises a wrapping layer located on the outermost side and a welding flux located on the inner side; the wrapping layer surrounds to form a tube shape and wraps the solder; the wrapping layer is made of a BAg30CuZn welding material, and the welding flux is soldering flux used for aiding welding; the wrapping layer comprises, by mass, 29%-31% of silver, 30%-34% of zinc and the balance copper. And the welding rod can be more uniformly distributed in a welding material.

Description

Technical Field

[0001] The invention relates to the technical field of welding materials, and in particular to a cored silver-copper-zinc welding wire, a production method and a cored equipment. Background Art

[0002] Silver-copper materials are common solder materials, such as those shown in patents with application publication numbers CN115533365A and CN116871736A. According to the existing national standard GB / T 10046-2018 "Silver solder", the BAg30CuZn solder has a melting temperature of 680°C at the solidus and 765°C at the liquidus. It is one of the most cost-effective silver solders on the market and is very popular among solder users. As a joint, it has good toughness and can be used for brazing copper, copper alloys, steel and other materials. In the traditional brazing process, the flux mixed into a paste, slurry or liquid state is pre-applied or sprayed on the part to be brazed, or the brazing part of the workpiece to be brazed is first heated, and then the solder is used to "stick" an appropriate amount of flux to the brazing part, and the heat of the heated part to be brazed is used to melt the flux with a lower melting point first, spread it on the welding part, remove the oxide, and make the molten solder better bonded to the welding part. However, since it is difficult to control the amount of flux to be "sticked", it is easy to have less flux or uneven distribution, so the cored welding wire appears, such as the content shown in the patent with authorization announcement number CN101920403B and application publication number CN102513726A.

[0003] In the existing flux-cored welding materials, the production is mainly completed by squeezing liquid flux into the alloy hollow tube; however, the alloy hollow tube containing silver material is prone to deformation, and the squeezed flux is prone to uneven distribution in the alloy hollow tube, containing bubbles, etc. Therefore, a cored silver-copper-zinc welding wire with uniform shape and uniform flux distribution, a production method and a corresponding cored equipment are needed. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and to provide a cored silver-copper-zinc welding wire, a production method and a cored equipment.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions: A cored silver-copper-zinc welding wire comprises an outermost wrapping layer and an inner solder; the wrapping layer is wrapped in a tubular shape and coated on the outside of the solder; the wrapping layer is a BAg30CuZn welding material, and the solder is a flux used for fluxing; the wrapping layer comprises 29% to 31% silver by mass, 30% to 34% zinc by mass, and the remaining component is copper.

[0006] A method for producing a cored silver-copper-zinc welding wire comprises the following steps: Step 1: Smelt silver, copper and zinc metals in a melting furnace at a set temperature according to a set mass ratio; Step 2: Casting the molten mixed metal into a mold of a set shape, and obtaining an unprocessed alloy block after natural cooling; Step 3: placing the unprocessed alloy block in a surface treatment device to perform a smooth surface treatment on the surface of the alloy block; Step 4: placing the surface-treated alloy block in a wire pressing device, extruding the alloy block into wire under high temperature and high pressure, and winding the extruded wire on a rotating cylinder; Step 5: Pickling the wound metal wire to remove the oxide layer formed by high-temperature extrusion; Step 6: Check and unify the diameter of the pickled wire; Step 7: rolling the pickled metal wire to obtain a metal strip; Step 8: Pass the metal strip through a guide roller with a U-shaped groove on the outside, and cooperate with the extrusion guide roller to bend the metal strip to form a metal groove belt with a "U"-shaped cross section; Step 9: Filling the metal slot with flux as solder by a vibrating feeding device; Step 10: The metal groove strip filled with flux passes through the sealing device to complete the sealing process to obtain the cored welding wire.

[0007] Furthermore, the mass proportion in step 1 is 29% to 31% by mass of silver, 30% to 34% by mass of zinc, and the rest is copper.

[0008] Furthermore, the surface treatment equipment in step 3 is a shot blasting equipment; the shot bodies used for impact in the shot blasting equipment are made of the same material as the alloy after the surface treatment in step 3.

[0009] Furthermore, the main acidic component in the solution used for pickling in step 5 is citric acid.

[0010] Furthermore, in step 2, a mold release agent is applied in advance to the cavity of the mold for casting the liquid mixed metal.

[0011] Furthermore, the smelting temperature in step 1 is 1100°C ± 100°C.

[0012] Furthermore, the temperature range of high temperature extrusion in step 4 is 400°C to 450°C.

[0013] Furthermore, after obtaining the cored welding wire in step 10, the welding wire is bent by a ring-bending device to form a cored welding ring.

[0014] A silver-copper-zinc welding wire core wrapping device, based on the above-mentioned production method, the core wrapping device comprises a cleaning structure, a bending structure, a filling structure and a core wrapping structure; wherein the cleaning structure is used to clean stains on the alloy bar; the bending structure is used to bend the alloy bar into an alloy bar with a groove; the filling structure is used to fill the alloy bar with a groove with flux powder and compact it; the core wrapping structure is used to bend the alloy bar filled with flux powder into a cylindrical alloy welding wire.

[0015] The beneficial effects of the present invention are: By providing a tubular welding material including a powdered brazing flux, on the one hand, the need for providing a flux core is met to ensure the welding effect, and on the other hand, the powdered brazing flux can be more evenly distributed inside the welding material; Through the production method of welding wire, the cored welding wire can be produced automatically, and the production process is highly efficient; By setting the same material to shot blast the alloy surface in step 3, on the one hand, the material loss is lower, and on the other hand, the purity of the alloy after the surface treatment is higher, and it is not easy to mix with other metal impurities, thereby ensuring the quality of the welding material; By setting citric acid as the pickling solvent, it is clean and environmentally friendly, and has a low degree of pollution to the environment; By setting up core-wrapped equipment, the flat alloy strips are processed into cored welding wires, and there are processes such as cleaning and compaction to make the solder evenly distributed, thus ensuring the quality of the final produced welding wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of Example 1; Figure 2 for Figure 1 A local enlarged view of area a; Figure 3 for Figure 1 A local enlarged view of area b; Figure 4 This is a schematic diagram of the cleaning structure of Example 1; Figure 5 Schematic diagram of the compacting device of Example 1; Figure 6 This is a schematic diagram of the coordination between the vibration device and the box of Example 1; Figure 7 Schematic diagram of the bending and ring-forming equipment of Example 1.

[0017] Explanation of the accompanying drawings: cleaning structure 1, cleaning groove 11, tensioning member 12, guide wheel 13, bending structure 2, vertical bending wheel group 21, horizontal bending wheel group 22, filling structure 3, vibration device 31, box 32, clamping plate 321, compacting device 33, first connecting rod 331, second connecting rod 332, compacting wheel 333, sliding member 334, core wrapping structure 4, horizontal core wrapping wheel group 41, vertical core wrapping wheel group 42, bending and ring forming equipment 5. DETAILED DESCRIPTION

[0018] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0019] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention. The figures only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0020] Embodiment 1: A cored silver-copper-zinc welding wire comprises an outermost wrapping layer and an inner solder; the wrapping layer is wrapped in a tubular shape and coated on the solder; the wrapping layer is a BAg30CuZn welding material, and the solder is a powdered flux used for fluxing; the wrapping layer comprises 29% to 31% silver by mass, 30% to 34% zinc by mass, and the remaining component is copper. The powdered flux can be more evenly distributed in the tubular wrapping layer.

[0021] A method for producing a cored silver-copper-zinc welding wire comprises the following steps: Step 1: Smelt silver, copper and zinc metals in a melting furnace at a set temperature according to a set mass ratio; Step 2: Casting the molten mixed metal into a mold of a set shape, and obtaining an unprocessed alloy block after natural cooling; Step 3: placing the unprocessed alloy block in a surface treatment device to perform a smooth surface treatment on the surface of the alloy block; Step 4: placing the surface-treated alloy block in a wire pressing device, extruding the alloy block into wire under high temperature and high pressure, and winding the extruded wire on a rotating cylinder; Step 5: Pickling the wound metal wire to remove the oxide layer formed by high-temperature extrusion; Step 6: Check and unify the diameter of the pickled wire; Step 7: rolling the pickled metal wire to obtain a metal strip; Step 8: Pass the metal strip through a guide roller with a U-shaped groove on the outside, and cooperate with the extrusion guide roller to bend the metal strip to form a metal groove belt with a "U"-shaped cross section; Step 9: Filling the metal slot with flux as solder by a vibrating feeding device; Step 10: The metal groove strip filled with flux passes through the sealing device to complete the sealing process to obtain the cored welding wire.

[0022] The mass ratio in step 1 is 29% to 31% of silver, 30% to 34% of zinc, and the rest is copper; through this mass ratio, a BAg30CuZn welding material containing about 30% of the mass can be smelted. In addition, the smelting temperature in step 1 is 1100°C ± 100°C.

[0023] In the step 2, a mold release agent is applied in advance to the cavity of the mold for casting the liquid mixed metal. The mold release agent makes it easier to separate the alloy after cooling and solidification from the casting equipment.

[0024] In the step 2, after obtaining the naturally cooled unprocessed alloy block, the unprocessed alloy block needs to be sawed to facilitate the subsequent shot blasting treatment.

[0025] The surface treatment equipment in step 3 is a shot blasting equipment; the ball body used for impact in the shot blasting equipment is made of the same material as the alloy after surface treatment in step 3; in this example, the welding wire after the treatment in step 5 or step 6 is cut into particles of 1mm to 10mm in length for shot blasting. Compared with the traditional process of directly cutting off the outer surface of the alloy to achieve surface treatment, the material loss of this embodiment is lower, and the same material as the alloy is used for shot blasting, so that the alloy after surface treatment is higher in purity and is not easily mixed with other metal impurities, thereby ensuring the quality of the welding material.

[0026] The temperature range of high temperature extrusion in step 4 is 400° C. to 450° C. The high temperature heating softens the alloy, making it easier to pass through the wire drawing hole and be extruded to form a wire-like product.

[0027] The main acid component in the solution used for pickling in step 5 is citric acid. Compared with the traditional cleaning method using sulfuric acid or hydrochloric acid, cleaning with citric acid is more environmentally friendly and safer for operators of the cleaning process. The pH value of the citric acid solution used for pickling ranges from 3.0 to 5.0.

[0028] After obtaining the cored welding wire in step 10, the welding wire is further bent by a ring-bending device 5 to form a cored welding ring; wherein the ring-bending device 5 for bending the welding wire is as follows: Figure 7 shown.

[0029] like Figure 1 to Figure 6 As shown, a silver-copper-zinc welding wire core-wrapping device includes a cleaning structure 1, a bending structure 2, a filling structure 3 and a core-wrapping structure 4.

[0030] The cleaning structure 1 is used to clean the stains on the alloy strip. The cleaning structure 1 is arranged at the front end, and the cleaning structure 1 uses high-pressure gas or a set liquid or a combination of the two to clean the stains on the surface of the flat alloy strip. The cleaning structure 1 includes a cleaning groove 11 and a tensioning member 12; wherein the tensioning member 12 is arranged between the cleaning groove 11 and the roller wound with the alloy strip; in this example, the tensioning member 12 includes two rollers that can adjust the position up and down, and the positions of the two rollers are adjusted to achieve tensioning of the alloy strip to prevent the alloy strip from flipping during the transmission process. In this example, a device for blowing is arranged above the cleaning groove 11, and the debris and impurities adhered to the surface of the alloy strip are removed by high-pressure gas. In order to ensure that the tensioned alloy strip can enter the cleaning groove 11 at an angle that fits the cleaning groove 11, a guide wheel 13 is also arranged between the tensioning member 12 and the cleaning groove 11, wherein the outer periphery of the guide wheel 13 is provided with a groove corresponding to the alloy strip, so that the alloy strip can be embedded in the groove and pass through from the other side to enter the cleaning groove 11.

[0031] The bending structure 2 is used to bend the alloy strip into an alloy strip with a groove. The bending structure 2 includes a plurality of groups of vertical bending wheel groups 21 and horizontal bending wheel groups 22, wherein each group of vertical bending wheel groups 21 includes a first bending wheel and a second bending wheel, wherein the outer periphery of the first bending wheel is provided with a U-shaped, V-shaped or square bending groove surrounding a circle, and the second bending wheel is provided with a bending protrusion corresponding to the first bending wheel; when the bending groove on the first bending wheel and the bending protrusion on the second bending wheel are engaged with each other, the alloy strip clamped between the two is bent into a set groove shape; each group of horizontal bending wheel groups 22 includes two corresponding horizontal rollers, and the horizontal rollers are respectively provided with corresponding grooves for shaping the outer side of the bent alloy strip.

[0032] The filling structure 3 is used to fill the flux powder onto the alloy strip with the groove and compact it. The filling structure 3 includes a vibration device 31 for vibrating and shaking off the flux powder and a box 32 for holding the flux powder, wherein the box 32 is fixedly arranged above the vibration device 31, and the bottom of the box 32 is arranged at an opening for dropping the flux powder, and the alloy strip passes through the bottom of the opening so that the flux powder dropped through the opening can fall into the groove of the alloy strip. It should be noted that a card plate 321 for clamping the powder is also arranged on both sides of the opening of the box 32, and there are two card plates 321, which are respectively located on both sides of the bottom of the opening of the box 32, corresponding to the direction of the alloy strip entering and leaving; the card plate 321 is provided with a downward card port, and when the alloy strip passes through the card plate 321 leaving the box 32, it can block the flux powder carried on the alloy strip that is higher than the edge of the groove of the alloy strip, and control the amount of flux powder carried on the alloy strip. The filling structure 3 also includes a compacting device 33, wherein the compacting device 33 includes a first connecting rod 331 for adjusting the height and a second connecting rod 332 for adjusting the distance, the second connecting rod 332 is slidably arranged on the first connecting rod 331 through a sliding member 334; a rotatable compacting wheel 333 is also slidably arranged on the second connecting rod 332, the compacting wheel 333 is arranged corresponding to the alloy bar, and is used for compacting the flux powder filled in the alloy bar.

[0033] The core structure 4 is used to bend the alloy strip filled with flux powder into a cylindrical alloy welding wire. The core structure 4 includes a plurality of horizontal core wheel groups 41 and a vertical core wheel group 42; in this example, the horizontal core wheel group 41 and the vertical core wheel group 42 are arranged in pairs, and the horizontal core wheel group 41 of the same pair is located in the vertical core wheel group 42 close to the filling structure 3, so as to ensure that when the alloy strip enters the core structure 4, it will first be squeezed by the horizontal core wheel group 41 to close the two side edges of the alloy strip to the middle, and then pass through the vertical core wheel group 42 to squeeze the overall contour of the alloy strip, and finally obtain the cored alloy welding wire after repeated extrusion.

[0034] During the implementation process, by setting the tubular welding material including the powdered brazing flux solder, on the one hand, the need for setting the flux core is met to ensure the welding effect, and on the other hand, the powdered brazing flux can be more evenly distributed inside the welding material; by the production method of the welding wire, the automated production of the cored welding wire is realized, and the production process efficiency is high; by setting the same material to perform shot blasting on the alloy surface in step 3, on the one hand, the material loss is lower, and on the other hand, the purity of the alloy after the surface treatment is higher, and it is not easy to mix with other metal impurity components, thereby ensuring the quality of the welding material; by setting citric acid as the pickling solvent, it is clean and environmentally friendly, and the degree of pollution to the environment is low; by setting the cored equipment, the flat alloy strip is processed into the cored welding wire, and there are cleaning, compaction and other processes, so that the solder is evenly distributed, thereby ensuring the quality of the welding wire finally produced.

[0035] The above description is only a specific example of the present invention and does not constitute any limitation to the present invention. It is obvious that for professionals in this field, after understanding the content and principle of the present invention, various modifications and changes in form and details may be made without departing from the principle and structure of the present invention, but these modifications and changes based on the idea of ​​the present invention are still within the scope of protection of the claims of the present invention.

Claims

1. A cored silver-copper-zinc welding wire, characterized in that: It includes an outermost wrapping layer and an inner solder; the wrapping layer is wrapped in a tubular shape and coated on the outside of the solder; the wrapping layer is BAg30CuZn solder, and the solder is a powdered flux used for fluxing; the wrapping layer includes 29% to 31% silver by mass, 30% to 34% zinc by mass, and the remaining component is copper.

2. A method for producing a cored silver-copper-zinc welding wire, characterized in that: The following steps are included Step 1: Smelt silver, copper and zinc metals in a melting furnace at a set temperature according to a set mass ratio; Step 2: Casting the molten mixed metal into a mold of a set shape, and obtaining an unprocessed alloy block after natural cooling; Step 3: placing the unprocessed alloy block in a surface treatment device to perform a smooth surface treatment on the surface of the alloy block; Step 4: placing the surface-treated alloy block in a wire pressing device, extruding the alloy block into wire under high temperature and high pressure, and winding the extruded wire on a rotating cylinder; Step 5: Pickling the wound metal wire to remove the oxide layer formed by high-temperature extrusion; Step 6: Check and unify the diameter of the pickled wire; Step 7: rolling the pickled metal wire to obtain a metal strip; Step 8: Pass the metal strip through a guide roller with a U-shaped groove on the outside, and cooperate with the extrusion guide roller to bend the metal strip to form a metal groove belt with a "U"-shaped cross section; Step 9: Filling the metal slot with flux as solder by a vibrating feeding device; Step 10: The metal groove strip filled with flux passes through the sealing device to complete the sealing process to obtain the cored welding wire.

3. The method for producing a cored silver-copper-zinc welding wire according to claim 2, characterized in that: The mass proportion in step 1 is 29% to 31% for silver, 30% to 34% for zinc, and the rest for copper.

4. The method for producing a cored silver-copper-zinc welding wire according to claim 2, characterized in that: The surface treatment equipment in step 3 is a shot blasting equipment; the shot bodies used for impact in the shot blasting equipment are made of the same material as the alloy after the surface treatment in step 3.

5. The method for producing a cored silver-copper-zinc welding wire according to claim 2, characterized in that: The main acidic component in the solution used for pickling in step 5 is citric acid.

6. The method for producing a cored silver-copper-zinc welding wire according to claim 2, characterized in that: In the step 2, a mold release agent is applied in advance to the cavity of the mold for casting the liquid mixed metal.

7. The method for producing a cored silver-copper-zinc welding wire according to claim 2, characterized in that: The smelting temperature in step 1 is 1100°C ± 100°C.

8. The method for producing a cored silver-copper-zinc welding wire according to claim 2, characterized in that: The temperature range of high temperature extrusion in step 4 is 400°C to 450°C.

9. The method for producing a cored silver-copper-zinc welding wire according to claim 2, characterized in that: After the cored welding wire is obtained in step 10, the welding wire is bent into a ring by a device to form a cored welding ring.

10. A silver-copper-zinc welding wire core-wrapping device, characterized in that: Based on the production method described in any one of claims 2 to 9, the core wrapping equipment comprises a cleaning structure (1), a bending structure (2), a filling structure (3) and a core wrapping structure (4); wherein the cleaning structure (1) is used to clean stains on the alloy bar; the bending structure (2) is used to bend the alloy bar into an alloy bar with grooves; the filling structure (3) is used to fill flux powder onto the alloy bar with grooves and compact it; the core wrapping structure (4) is used to bend the alloy bar filled with flux powder into a cylindrical alloy welding wire.

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