High-frequency induction welding-brazing method and device suitable for anode aluminum guide rod and steel claw

Abstract

A high-frequency induction melt-brazing method suitable for an anode aluminum guide rod and a steel claw comprises the steps that to-be-welded surfaces of the anode aluminum guide rod and the steel claw are pretreated, and then high-frequency electromagnetic induction heating coils are arranged around the steel claw; a layer of brazing filler metal is laid on the to-be-welded surface of the steel claw, the steel claw is heated to the first preset temperature through induction current generated by a high-frequency electromagnetic induction heating coil, the heating time is controlled to the first preset time, the brazing filler metal is molten and diffused to the to-be-welded surface of the steel claw, and a steel claw welding precursor is obtained; the anode aluminum guide rod is placed on the welding surface of the steel claw welding precursor, a layer of brazing filler metal is laid between the welding surface of the steel claw welding precursor and the anode aluminum guide rod, the induction current generated by the high-frequency electromagnetic induction heating coil is utilized again to heat the steel claw to the second preset temperature, the heating time is controlled to the second preset time, and the steel claw welding precursor is obtained. And high-frequency induction melt-brazing of the anode aluminum guide rod and the steel claw is realized.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of aluminum / steel dissimilar metal welding, and in particular to a method and device for high-frequency induction brazing welding of anodized aluminum guide rods and steel claws. Background Art

[0002] With the development of the electrolytic aluminum industry, the connection technology of anode guide rod assemblies has become a key factor affecting electrolysis efficiency and equipment operational stability. Anode guide rod assemblies are key components used to support anodes and connect current in the electrolytic aluminum industry. Their primary function is to transmit current from an external power source to the anodes within the electrolytic cell, while also supporting the stable operation of the anodes within the cell. Their structure primarily consists of anode aluminum guide rods and anode steel claws connected by aluminum-steel explosive welds.

[0003] While the current aluminum-steel explosive welding method is a mature technology, with the implementation of tiered electricity pricing for electrolytic aluminum, major aluminum electrolysis companies urgently need a method to reduce the interface resistivity of the aluminum-steel explosive block. For example, a technology that can directly connect the aluminum guide rod and the steel claw can effectively reduce the resistivity of the entire anode guide rod assembly, thereby reducing energy consumption. At the same time, eliminating the aluminum-steel explosive welding block can also save companies some material costs.

[0004] In addition, some companies are experimenting with arc brazing to weld anode guide rods and steel claws. This method eliminates the need for aluminum-steel explosive blocks. The process involves first arc welding a layer of aluminum to the end of the steel claw, followed by aluminum-to-aluminum welding of the aluminum anode guide rod and the aluminum claw. This process, which involves arc welding aluminum to steel, is technically challenging and requires the expertise of engineers and construction technicians, making product quality difficult to guarantee. Therefore, the aforementioned companies have introduced robotic technology to simplify the welding process, but this has undoubtedly significantly increased the cost of preparing the anode guide rods and steel claws. Furthermore, while this new technology eliminates explosive blocks and reduces production costs, the inefficiency of brazing aluminum to large-section steel claws using arc welding in separate passes is unfavorable for large-scale, rapid production, and cannot fully address the energy conservation and consumption reduction challenges faced by electrolytic aluminum companies. Summary of the Invention

[0005] The embodiments of the present application provide a method and device for high-frequency induction brazing of anodized aluminum guide rods and steel claws, which can significantly reduce the resistivity of the connection between the anodized aluminum guide rods and steel claws, improve the conductive efficiency and structural strength, while further improving the working efficiency of brazing and reducing equipment investment costs.

[0006] The following technical solutions are adopted in the embodiments of the present application:

[0007] In the first aspect, an embodiment of the present application provides a high-frequency induction brazing method suitable for anodized aluminum guide rods and steel claws, comprising: pre-treating the surfaces to be welded of the anodized aluminum guide rods and steel claws, and then arranging a high-frequency electromagnetic induction heating coil around the steel claws; laying a layer of brazing material on the surface to be welded of the steel claws, heating the steel claws to a first preset temperature using the induced current generated by the high-frequency electromagnetic induction heating coils, and controlling the heating time to the first preset time so that the brazing material melts and diffuses to the surface to be welded of the steel claws to obtain a steel claw welding precursor; wherein the brazing material includes metal elements Al, Cu, Mg, Si and rare elements Ce and La; placing the anodized aluminum guide rod on the welding surface of the steel claw welding precursor, and laying a layer of brazing material between the welding surface of the steel claw welding precursor and the anodized aluminum guide rod, and again heating the steel claws to a second preset temperature using the induced current generated by the high-frequency electromagnetic induction heating coils, and controlling the heating time to the second preset time to achieve high-frequency induction brazing connection of the anodized aluminum guide rods and the steel claws.

[0008] In this embodiment, the high-frequency induction brazing method primarily utilizes the principle of high-frequency electromagnetic induction heating. Using the induced current generated by the induction heating coil, the metal surface is heated to the required brazing temperature, achieving an efficient connection between the anodized aluminum guide rod and the steel claw. Specifically, the surfaces to be welded of the anodized aluminum guide rod and the steel claw are first pretreated to remove surface oxides and contaminants, ensuring a clean surface with good weldability. Then, a layer of brazing filler metal, specifically an alloy brazing filler metal containing metallic elements such as Al, Cu, Mg, and Si, as well as rare elements such as Ce and La, is applied to the surface to be welded of the steel claw. Using the induced current generated by the high-frequency electromagnetic induction heating coil, the steel claw is heated to a first predetermined temperature. The heating time is controlled to the first predetermined time, allowing the brazing filler metal to melt and diffuse onto the surface to be welded of the steel claw, forming a weld precursor for the steel claw. The anodized aluminum guide rod is then placed between the heated weld surfaces of the steel claw weld precursor, and another layer of brazing filler metal is applied. Under the action of the heating coil, the steel claw is further heated to a second predetermined temperature, causing the brazing filler metal to melt and form a secure connection between the anodized aluminum guide rod and the steel claw surface. Through high-frequency induction heating technology, high-frequency induction brazing connection is finally achieved between the anodized aluminum guide rod and the steel claw, achieving the effects of high structural strength, good conductive efficiency and stable connection.

[0009] High-frequency induction brazing technology can avoid the high interface resistivity problem encountered in aluminum-steel explosive welding. In aluminum-steel explosive welding, the interface often exhibits high resistance. High-frequency induction brazing, however, creates a more uniform interface by melting the brazing filler metal at high temperatures, effectively reducing the overall resistivity of the anode guide rod assembly. This technology ensures a tighter connection between the anode aluminum guide rod and the steel claw, resulting in a welded joint with enhanced conductivity and structural strength. A good connection improves current transmission efficiency, boosts electrolysis efficiency, and ensures stable performance of the anode guide rod assembly over extended periods of operation. While aluminum-steel explosive welding plates are expensive to produce, this solution eliminates the need for them. By directly connecting the anode aluminum guide rod and the steel claw through high-frequency induction brazing, material costs are reduced, significantly reducing production costs, especially in large-scale production. High-frequency induction brazing boasts a high heating rate and precise temperature control, enabling the welding of the anode aluminum guide rod and the steel claw to be completed in a relatively short time. This method is more efficient than traditional arc welding or aluminum-steel explosive welding, making it suitable for high-volume, rapid production, thus addressing the inefficiency faced by electrolytic aluminum producers. Compared to arc brazing, which requires complex procedures and high technical requirements, high-frequency induction brazing offers a relatively simple process, lower equipment costs, and a high degree of automation, reducing the need for highly skilled labor. Furthermore, this technology eliminates the need for complex robotic systems, further reducing equipment investment.

[0010] As an achievable embodiment, the method further includes: using a welding mold to surround the area to be welded of the steel claw; wherein the welding mold includes a graphite mold and a steel mold.

[0011] As a feasible embodiment, the pretreatment includes: soaking the surface of the steel claw to be welded in 10% hydrochloric acid for 5 minutes, then rinsing with clean water, then neutralizing with 10% NaOH and drying, and / or sandblasting the surface of the steel claw to be welded; cleaning the surface of the anodized aluminum guide rod to be welded with an ultrasonic cleaner to remove oxides and oil stains on the surface of the anodized aluminum guide rod to be welded.

[0012] As a feasible embodiment, the method further includes: weighing 20% ​​Cu, 4-8% Mg, 8-10% Si, 0.05%-0.3% Ce, 0.2%-0.8% La, and the balance Al in weight percentage, stirring them evenly and then melting them, cooling the molten metal liquid to set it, and obtaining a solder for welding.

[0013] As a feasible implementation method, the stirring time is 60 to 120 seconds; the melting temperature is 680° C., and the melting time is 60 to 120 seconds.

[0014] As a feasible implementation method, the smelting method includes any one of plasma arc heating melting and induction furnace heating.

[0015] As a feasible implementation, the first preset temperature is 800-970° C., and the first preset time is 8-12 seconds.

[0016] As a feasible implementation, the second preset temperature is 800-970° C., and the second preset time is 8-12 seconds.

[0017] In the second aspect, the embodiment of the present application also provides a high-frequency induction brazing device suitable for anodized aluminum guide rods and steel claws, including: a welding mold, which is arranged around the area to be welded of the anodized aluminum guide rods and steel claws; a high-frequency electromagnetic induction heating coil, which is arranged on the peripheral side of the welding mold and is used to heat the steel claws and the anodized aluminum guide rods.

[0018] As a feasible implementation manner, the welding mold includes a graphite mold and a steel mold.

[0019] As a feasible implementation method, the graphite mold and the steel mold are split molds, and the separate parts of the graphite mold and the steel mold are combined into a complete welding mold through a clamping piece.

[0020] As a feasible implementation, the clamping member includes any one of a pin, a buckle, and a snap ring.

[0021] As a feasible implementation method, the high-frequency electromagnetic induction heating coil is a hollow tube made of copper.

[0022] As a feasible implementation method, the high-frequency electromagnetic induction heating coil has an appearance consistent with the anodized aluminum guide rod and the area to be welded of the steel claw after processing, and the high-frequency electromagnetic induction heating coil is 20 mm away from the surface of the steel claw material.

[0023] As a feasible implementation manner, the high-frequency electromagnetic induction heating coil includes an arc-shaped induction coil and a square induction coil.

[0024] As a feasible implementation method, the induction power of the high-frequency electromagnetic induction heating coil is 0-40kW.

[0025] As a feasible implementation method, the induced current of the high-frequency electromagnetic induction heating coil is 70-90A.

[0026] As a feasible implementation, the induction heating time of the high-frequency electromagnetic induction heating coil is 8-130s.

[0027] As a feasible implementation manner, the distance between the surfaces to be welded of the steel claws and the anodized aluminum guide rod is 80-120 mm.

[0028] As a feasible embodiment, the device further comprises a brazing material, which is arranged between the steel claw and the anodized aluminum guide rod to achieve high-frequency induction brazing connection between the anodized aluminum guide rod and the steel claw.

[0029] In summary, this application has the following beneficial effects:

[0030] First, the aluminum-based brazing filler metal prepared by the present invention utilizes the metallic elements Al, Cu, Mg, and Si, as well as the rare elements Ce and La. Cu improves electrical conductivity and increases the strength of the welded joint, Mg reduces the brazing filler metal's oxidation tendency and improves its wettability, and Si and Al form a eutectic, significantly lowering the filler metal's melting point. Si also improves its ductility. The rare elements Ce and La purify the molten pool, refine the grain size, and improve wettability. The resulting brazing filler metal exhibits excellent wettability, inhibiting the excessive growth of intermetallic compounds (IMCs) at the metallurgical interface layer. This improves the mechanical properties of the dissimilar metal welded joint between the anode aluminum guide rod and the steel claw, enabling efficient and reliable dissimilar metal connections between the anode aluminum guide rod and the steel claw, and is therefore widely applicable in the brazing industry.

[0031] Second, the present invention provides a method for high-frequency induction brazing of dissimilar metals between anodized aluminum guide rods and steel claws. This method achieves steel-to-steel induction brazing and aluminum-to-steel induction fusion welding in separate steps. This method is simple, convenient, cost-effective, and easy to operate, overcoming the complex, costly, and difficult-to-control processes of aluminum-steel fusion welding and pressure welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following is a brief introduction to the drawings used in describing the embodiments.

[0033] In the various drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the drawings are not drawn to scale, and certain features may be exaggerated or omitted to more clearly illustrate and explain the present application.

[0034] Figure 1 A schematic diagram of a process for high-frequency induction brazing of anodized aluminum guide rods and steel claws provided in an embodiment of the present application is shown;

[0035] Figure 2 A schematic diagram of another process for high-frequency induction brazing of anodized aluminum guide rods and steel claws provided in an embodiment of the present application is shown;

[0036] Figure 3 Flow chart for solder preparation;

[0037] Figure 4 A schematic structural diagram of a high-frequency induction brazing device for anodized aluminum guide rods and steel claws provided in Example 1 of the present application is shown;

[0038] Figure 5 A schematic structural diagram of a high-frequency induction brazing device for anodized aluminum guide rods and steel claws provided in Example 2 of the present application is shown;

[0039] Figure 6 A schematic structural diagram of a high-frequency induction brazing device suitable for anodized aluminum guide rods and steel claws provided in Example 3 of the present application is shown. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0043] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0044] In the description of this specification, the description with reference to the terms "some implementations", "some embodiments", "exemplary", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are contradictory.

[0045] The embodiment of the present application provides a high-frequency induction brazing method suitable for anodized aluminum guide rods and steel claws, which uses a welding device to weld the anodized aluminum guide rods and steel claws, and mainly includes two parts: brazing material preparation and induction welding. First, the required aluminum-based brazing material is smelted according to different mass percentages of metal elements, and then the surfaces to be welded of steel and aluminum alloy materials are pretreated, and finally a high-frequency induction brazing process is used to realize the step-by-step connection of aluminum and steel. The high-frequency induction brazing method provided in the embodiment of the present application is simple, low-cost, and easy to operate. It overcomes the problems of complex, high-cost, and difficult-to-control aluminum-steel brazing and pressure welding processes, improves the strength of aluminum-steel joints, obtains aluminum-steel welded joints with uniform weld structure and excellent joint mechanical properties, and realizes efficient and reliable connection of aluminum / steel dissimilar metals.

[0046] The preferred embodiments of the present invention are described in further detail below.

[0047] A high-frequency induction brazing method for anodized aluminum guide rods and steel claws, the welding process mainly includes the preparation of an Al-based brazing filler metal and the welding of aluminum and steel. The Al-based brazing filler metal may be in a powdered or blocky form, but is not limited to the powdered or blocky form.

[0048] In some embodiments, the mass percentages of the elements in the Al-based brazing filler metal are 20% Cu, 4-8% Mg, 8-10% Si, 0.05-0.3% Ce, 0.2-0.8% La, and the remainder Al, totaling 50g. It should be noted that the raw materials for Cu, Mg, Si, and Al are 99.9% pure metal pellets.

[0049] Figure 1 A schematic flow chart of a high-frequency induction brazing method for anodized aluminum guide rods and steel claws provided in an embodiment of the present application is shown.

[0050] like Figure 1 As shown, the method includes the following steps:

[0051] S101, pre-treating the surfaces of the anodized aluminum guide rod and the steel claws to be welded, and then arranging a high-frequency electromagnetic induction heating coil around the steel claws.

[0052] S102. A layer of solder is applied on the surface of the steel claw to be welded, and the steel claw is heated to a first preset temperature by using the induced current generated by the high-frequency electromagnetic induction heating coil. The heating time is controlled to the first preset time so that the solder melts and diffuses to the surface of the steel claw to be welded, thereby obtaining a steel claw welding precursor; wherein the solder includes metal elements Al, Cu, Mg, Si and rare elements Ce and La.

[0053] S103. Place the anodized aluminum guide rod on the welding surface of the steel claw welding precursor, and lay a layer of brazing material between the welding surface of the steel claw welding precursor and the anodized aluminum guide rod. Use the induced current generated by the high-frequency electromagnetic induction heating coil again to heat the steel claw to a second preset temperature, control the heating time to the second preset time, and realize the high-frequency induction brazing connection between the anodized aluminum guide rod and the steel claw.

[0054] In some embodiments, Figure 2 A flow chart of another method for high-frequency induction brazing welding of anodized aluminum guide rods and steel claws provided in an embodiment of the present application is shown. Figure 3 The figure is a flow chart of solder preparation. Figure 2 and Figure 3 As shown, the method includes the following steps:

[0055] Step 1: Weighing metal powder: Weigh a certain amount of Al, Cu, Mg, Si metal elements, as well as rare elements such as La and Ce according to different mass percentages.

[0056] Step 2: Mixing powder: Pour the metal powder material obtained in step 1 into a crucible and stir evenly; wherein, the stirring time is 60 to 120 seconds.

[0057] Step 3: Prepare the brazing material: Place the crucible in a high-frequency electromagnetic induction heating coil and heat it to a certain temperature for melting. Pour the molten metal into a shaping mold and cool it to form the brazing material. The heating time is 70 to 100 seconds. It should be noted that in this step, the shaping mold is circular. In some embodiments, the shaping mold can also be rectangular, trapezoidal, triangular, or other special shapes. The specific shape can be determined according to the shape of the surface to be welded, and this is not strictly limited in this embodiment.

[0058] Step 4: Pre-treatment of the welded parts: The welded surfaces of the anode steel claws are first soaked in 10% hydrochloric acid for 5 minutes, then rinsed with water, neutralized with 10% sodium hydroxide, and dried. Alternatively, the welded surfaces of the claws are sandblasted. The welded surfaces of the anode aluminum guide rods are then cleaned using an ultrasonic cleaner to remove oxides and oil stains. This sandblasting step specifically involves sandblasting at room temperature (25°C) using at least one of the following grit materials: silicon carbide, brown corundum, or garnet. The spray gun pressure is ≥0.3 MPa, and the distance between the spray gun and the material surface is ≤300 mm. This uniformly removes the oxide layer from the welded surfaces of the claws.

[0059] Step 5: Device layout: Place the steel claw at the bottom, surround the surface of the steel claw to be welded with a welding mold, then place the solder on the upper part of the surface of the steel claw to be welded and in the welding mold; then place it in the induction coil.

[0060] Step 6: Induction brazing of steel and solder: Use a high-frequency electromagnetic induction heating coil to heat the steel claws, control the temperature to 800-970°C and the heating time to 8-12s, so that the solder melts and diffuses to achieve the connection between the steel and the solder.

[0061] Step 7: Induction welding of aluminum and solder: Based on step 6, place an anodized aluminum guide rod on the upper part of the steel claw welding area, and place solder between the steel claw and the anodized aluminum guide rod; use a high-frequency electromagnetic induction heating coil to heat the steel claw, control the temperature to 800-970℃ and the heating time to 8-12s to achieve induction welding of aluminum and aluminum.

[0062] Figure 4 A schematic structural diagram of a high-frequency induction brazing device for anodized aluminum guide rods and steel claws provided in Example 1 of the present application is shown; Figure 5 A schematic structural diagram of a high-frequency induction brazing device for anodized aluminum guide rods and steel claws provided in Example 2 of the present application is shown; Figure 6 The schematic diagram of the structure of a high-frequency induction brazing device for anodized aluminum guide rods and steel claws provided in Example 3 of the present application is shown. Figures 4 to 6 The present application also provides a high-frequency induction brazing device for anodized aluminum guide rods and steel claws, suitable for use in the aforementioned brazing method. The brazing device primarily comprises a welding mold positioned around the area to be welded between the anodized aluminum guide rod and the steel claw; and a high-frequency electromagnetic induction heating coil positioned around the welding mold for heating the steel claw and the anodized aluminum guide rod. In this embodiment, to ensure optimal welding between the steel claw and the anodized aluminum guide rod, the spacing between the surfaces to be welded between the steel claw and the anodized aluminum guide rod is 80-120 mm, allowing for easy placement of the aluminum-based brazing filler metal between the welding surfaces of the steel claw and the anodized aluminum guide rod.

[0063] In some embodiments, the welding mold includes a graphite mold and a steel mold. It should be noted that in some embodiments, the graphite mold and the steel mold can be designed as a single piece, which provides greater strength. In other embodiments, the graphite mold and the steel mold are separate molds, with the separate pieces of the graphite mold and the steel mold assembled into a complete welding mold via a snap-fit ​​assembly. For example, the welding mold can be hollow cylindrical or rectangular. In this embodiment, the specific shape of the welding mold is not strictly limited.

[0064] Exemplarily, taking a graphite mold as an example, a split mold refers to a graphite mold that is composed of a plurality of parts assembled as a whole. For example, the graphite mold includes a front plugging mold, a rear plugging mold and a bottom plugging mold (not shown in the figure) that are surrounded and fixed by a clip around the anodized aluminum guide rod and the steel claw to be welded. Alternatively, the welding mold is divided into two hollow semi-cylinders, and then the two hollow semi-cylinders are fixed at the welding area to facilitate subsequent welding operations. Exemplarily, the two hollow semi-cylinders can be bonded to the welding area; or, the opposite side walls of the two hollow semi-cylinders extend outwardly to form ear plates, and then the two relatively abutting ear plates can be fixed to the welding area by screws; or, a slot can be provided on the side wall of a hollow semi-cylinder, and a buckle that can be clamped in the slot is provided on the opposite side wall of the other hollow semi-cylinder, and the purpose of fixing the two hollow semi-cylinders at the welding area is achieved by the slot and the buckle, and this application does not limit this.

[0065] Exemplarily, the clamping member includes any one of a bayonet pin, a buckle, and a snap ring. Among them, the bayonet pin is a small metal pin, usually used in conjunction with a hole, and is used to fix the two parts of the mold together. The characteristic of the bayonet pin is that it can easily connect or separate the mold by inserting or removing it. It is understandable that the buckle is a common metal part used to quickly lock two parts. The buckle is simple and convenient in design, and can be automatically clamped by elastic action, and can be used to connect the split parts of the welding mold. The snap ring is an annular clamping member, which is often used to lock two parts by internal and external cooperation. Common snap rings include inner snap rings and outer snap rings. When used, the snap ring will be pressed into or bounced into the corresponding groove to firmly connect the parts. In this embodiment, there is no strict restriction on the form of the clamping member.

[0066] In some embodiments, the high-frequency electromagnetic induction heating coil is a hollow copper tube. After processing, its shape is consistent with the welded area of ​​the anodized aluminum guide rod and the steel claw, and the high-frequency electromagnetic induction heating coil is 20 mm from the surface of the steel claw. Exemplary high-frequency electromagnetic induction heating coils include arc-shaped induction coils and square induction coils. The high-frequency electromagnetic induction heating coil has an induction power of 0-40 kW, an induction current of 70-90 A, and an induction heating time of 8-130 seconds.

[0067] In order to further illustrate the present application, the technical solutions provided in the present application are described in detail below in conjunction with the embodiments, but they should not be understood as limiting the scope of protection of the present application.

[0068] Example 1

[0069] A high-frequency induction brazing method for anodized aluminum guide rods and steel claws, used in Figure 4 The welding device shown comprises the following steps:

[0070] 1) The raw metals were weighed and proportioned, wherein Cu was 10 g; Mg was 2 g; Si was 4 g; Ce was 0.05 g; La was 0.1 g; Al was 33.85 g, for a total of 50 g.

[0071] 2) Pure metal raw materials Cu, Mg, Si, Al, Ce, and La were placed in a graphite crucible, and the crucible was placed in a high-frequency electromagnetic induction heating coil. The heating coil was heated to 950°C for 76 seconds, and stirring was continued for 85 seconds to melt the metal raw materials.

[0072] 3) After the above smelting step is completed, the graphite crucible is taken out from the high-frequency electromagnetic induction heating coil and poured into a shaping mold. The liquid alloy is cooled and formed to obtain an Al-based solder block of the desired shape.

[0073] 4) Soak the steel claws in 10% hydrochloric acid for 5 minutes, then rinse with clean water, neutralize with 10% NaOH, and dry. Then use an ultrasonic cleaner to clean the surface of the anodized aluminum guide rod to be welded to remove oxides and oil stains on the surface to be welded.

[0074] 5) Place the steel claw at the bottom, surround the surface of the steel claw to be welded with a graphite mold, then place the brazing material on the upper part of the surface of the steel claw to be welded and in the graphite mold; then place it in a high-frequency electromagnetic induction heating coil.

[0075] 6) A high-frequency electromagnetic induction heating coil is used for heating, and the temperature is controlled to be 900°C and the heating time is 12 seconds, so that the solder melts and diffuses to achieve the connection between the steel and the solder.

[0076] 7) Based on step 6, an anodized aluminum guide rod is placed on the upper part of the steel claw, and a brazing material is placed between the steel claw and the anodized aluminum guide rod; a high-frequency electromagnetic induction heating coil is used, the temperature is controlled to 900°C and the heating time is 10 seconds, to achieve induction welding of aluminum and aluminum, and complete the connection of aluminum / steel dissimilar metals.

[0077] Example 2

[0078] A high-frequency induction brazing method for anodized aluminum guide rods and steel claws, used in Figure 5 The welding device shown comprises the following steps:

[0079] 1) The raw metals were weighed and proportioned, wherein Cu was 10 g; Mg was 3 g; Si was 6 g; Ce was 0.1 g; La was 0.2 g; Al was 30.7 g, for a total of 50 g.

[0080] 2) Pure metal raw materials Cu, Mg, Si, Al, Ce, and La were placed in a graphite crucible, and the crucible was placed in a high-frequency electromagnetic induction heating coil. The heating coil was heated to 680°C for 92 seconds, and stirring was continued for 112 seconds to melt the metal raw materials.

[0081] 3) After the above smelting step is completed, the graphite crucible is taken out from the high-frequency electromagnetic induction heating coil and poured into a shaping mold. The liquid alloy is cooled and formed to obtain an Al-based solder block of the desired shape.

[0082] 4) Soak the steel claws in 10% hydrochloric acid for 5 minutes, then rinse with clean water, neutralize with 10% NaOH, and dry. Then use an ultrasonic cleaner to clean the surface of the anodized aluminum guide rod to be welded to remove oxides and oil stains on the surface to be welded.

[0083] 5) Place the steel claw at the bottom, surround the surface of the steel claw to be welded with a steel mold, then place the brazing material on the upper part of the surface of the steel claw to be welded and in the steel mold; then place it in a high-frequency electromagnetic induction heating coil.

[0084] 6) A high-frequency electromagnetic induction heating coil is used for heating, and the temperature is controlled to be 970° C. and the heating time is 8 s, so that the solder melts and diffuses to achieve the connection between the steel and the solder.

[0085] 7) Based on step 6, an anodized aluminum guide rod is placed on the upper part of the steel claw, and a brazing material is placed between the steel claw and the anodized aluminum guide rod; a high-frequency electromagnetic induction heating coil is used, the temperature is controlled to 970°C and the heating time is 8 seconds, to achieve induction welding of aluminum and aluminum, and complete the aluminum / steel dissimilar metal connection.

[0086] Example 3

[0087] A high-frequency induction brazing method for anodized aluminum guide rods and steel claws, used in Figure 6 The welding device shown comprises the following steps:

[0088] 1) The raw metals were weighed and proportioned, wherein Cu was 10 g; Mg was 4 g; Si was 5 g; Ce was 0.15 g; La was 0.4 g; Al was 30.45 g, for a total of 50 g.

[0089] 2) Pure metal raw materials Cu, Mg, Si, Al, Ce, and La are placed in a graphite crucible, and the crucible is placed in a high-frequency electromagnetic induction heating coil. The heating coil is heated to 670°C for 100 seconds; and stirring is continued for 100 seconds to melt the metal raw materials.

[0090] 3) After the above smelting step is completed, the graphite crucible is taken out from the high-frequency electromagnetic induction heating coil and poured into a shaping mold. The liquid alloy is cooled and formed to obtain an Al-based solder block of the desired shape.

[0091] 4) Soak the steel claws in 10% hydrochloric acid for 5 minutes, then rinse with clean water, neutralize with 10% NaOH, and dry. Then use an ultrasonic cleaner to clean the surface of the anodized aluminum guide rod to be welded to remove oxides and oil stains on the surface to be welded.

[0092] 5) Place the steel claw at the bottom, surround the surface of the steel claw to be welded without using a welding mold, and then place the solder on the upper part of the surface of the steel claw to be welded; then place it into the high-frequency electromagnetic induction heating coil.

[0093] 6) A high-frequency electromagnetic induction heating coil is used for heating, and the temperature is controlled to be 800°C and the heating time is 8s, so that the solder melts and diffuses to achieve the connection between the steel and the solder.

[0094] 7) Based on step 6, an anodized aluminum guide rod is placed on top of the steel claw, and brazing filler metal is placed between the steel claw and the anodized aluminum guide rod. A high-frequency electromagnetic induction heating coil is used, controlled at a temperature of 800°C and a heating time of 12 seconds, to achieve induction welding of the aluminum to the aluminum, completing the aluminum / steel dissimilar metal connection. It should be noted that in this step, since a welding mold is not used to secure the welding area between the steel claw and the anodized aluminum guide rod, a steel rod is used to help secure the anodized aluminum guide rod above the steel claw to ensure stable welding. This reduces the possibility of misalignment during the brazing process.

[0095] The embodiments of the present application provide a high-frequency induction brazing method and device for anode aluminum guide rods and steel claws. This method solves many problems in traditional welding methods through efficient and low-cost technical means, and has significant advantages in reducing resistance, improving electrolysis efficiency, saving materials and production costs, etc. At the same time, its efficient production process and relatively simple process also provide a feasible energy-saving and consumption-reducing solution for electrolytic aluminum companies. Therefore, this technology is not only of great significance for improving the production efficiency and economic benefits of the electrolytic aluminum industry, but also meets the industry's needs for environmental protection and sustainable development.

[0096] Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present application. Those skilled in the art should understand that, although the present application has been described in detail with reference to the aforementioned embodiments, the technical solutions described in the aforementioned embodiments may be modified or some of the technical features thereof may be replaced with equivalents. However, such modifications or replacements do not deviate from the spirit and scope of the technical solutions in the various embodiments of the present application.

Claims

1. A high-frequency induction brazing method for anodized aluminum guide rods and steel claws, characterized in that: include: The surfaces of the anodized aluminum guide rod and the steel claw to be welded are pre-treated, and then a high-frequency electromagnetic induction heating coil is arranged around the steel claw; A layer of brazing filler metal is applied to the surface of the steel claw to be welded, and the steel claw is heated to a first preset temperature using an induced current generated by a high-frequency electromagnetic induction heating coil. The heating time is controlled to the first preset time so that the brazing filler metal melts and diffuses to the surface of the steel claw to be welded, thereby obtaining a steel claw welding precursor; wherein the brazing filler metal includes metallic elements such as Al, Cu, Mg, and Si, and rare elements such as Ce and La; An anodized aluminum guide rod is placed on the welding surface of the steel claw welding precursor, and a layer of brazing material is laid between the welding surface of the steel claw welding precursor and the anodized aluminum guide rod. The steel claw is again heated to a second preset temperature by the induced current generated by the high-frequency electromagnetic induction heating coil, and the heating time is controlled to the second preset time to achieve high-frequency induction brazing connection between the anodized aluminum guide rod and the steel claw.

2. The method according to claim 1, characterized in that The method further includes: using a welding mold to surround the area to be welded of the steel claw; wherein the welding mold includes a graphite mold and a steel mold.

3. The method according to claim 1, characterized in that The pretreatment includes: Soaking the surface of the steel claw to be welded in 10% hydrochloric acid for 5 minutes, then rinsing with clean water, then neutralizing with 10% NaOH and drying, and / or sandblasting the surface of the steel claw to be welded; Use an ultrasonic cleaner to clean the surface of the anodized aluminum guide rod to be welded to remove oxides and oil stains on the surface of the anodized aluminum guide rod to be welded.

4. The method according to any one of claims 1 to 3, characterized in that The method further comprises: According to weight percentage, 20% Cu, 4-8% Mg, 8-10% Si, 0.05%-0.3% Ce, 0.2%-0.8% La and the balance Al are weighed, stirred evenly and then smelted. The molten metal liquid is cooled and shaped to obtain a solder for welding.

5. The method according to claim 4, characterized in that The stirring time is 60 to 120 seconds; the melting temperature is 680° C., and the melting time is 60 to 120 seconds.

6. The method according to claim 4, characterized in that The smelting method includes any one of plasma arc heating melting and induction furnace heating.

7. The method according to any one of claims 1 to 3, characterized in that The first preset temperature is 800-970° C., and the first preset time is 8-12 seconds.

8. The method according to any one of claims 1 to 3, characterized in that The second preset temperature is 800-970° C., and the second preset time is 8-12 seconds.

9. A high-frequency induction brazing device suitable for anodized aluminum guide rods and steel claws, characterized in that: include: A welding mold is arranged around the area to be welded of the anodized aluminum guide rod and the steel claw; A high-frequency electromagnetic induction heating coil is arranged on the peripheral side of the welding mold and is used to heat the steel claws and the anodized aluminum guide rod.

10. The device according to claim 9, characterized in that The welding mold includes a graphite mold and a steel mold.

Images