A high-frequency induction melting and brazing device for an anode aluminum guide rod and a steel claw

Abstract

A high-frequency induction brazing device for anode aluminum guide rods and steel claws includes: a welding mold surrounding the welding area of ​​the anode aluminum guide rod and steel claws; and a high-frequency electromagnetic induction heating coil disposed around the periphery of the welding mold for heating the steel claws and anode aluminum guide rods. The high-frequency induction brazing device provided in this application is simple, low-cost, and easy to operate, overcoming the problems of complex, high-cost, and difficult-to-control aluminum-steel brazing and pressure welding processes. It improves the strength of the aluminum-steel joint, obtains an aluminum-steel welded joint with uniform weld structure and excellent mechanical properties, and achieves efficient and reliable connection of dissimilar metals such as aluminum and steel.

Description

Technical Field

[0001] This application relates to the field of aluminum / steel dissimilar metal welding technology, and in particular to a high-frequency induction brazing device suitable for aluminum anode guide rods and steel claws. Background Technology

[0002] With the development of the electrolytic aluminum industry, the connection technology of the anode guide rod assembly has become a key factor affecting electrolysis efficiency and equipment operation stability. Among them, the anode guide rod assembly is a key component in the electrolytic aluminum industry used to support the anode and connect the current. Its main function is to transmit the current from the external power source to the anode in the electrolytic cell, while supporting the stable operation of the anode in the electrolytic cell. Its structure mainly consists of an anode aluminum guide rod and an anode steel claw connected by aluminum-steel explosion welded plates.

[0003] While the current aluminum-steel explosive welding method is technically mature, with the implementation of tiered electricity pricing for electrolytic aluminum, major aluminum electrolysis companies urgently need a way to reduce the interfacial resistivity at the aluminum-steel explosive block. For example, a technology that enables direct connection between the aluminum guide rod and the steel claw could effectively reduce the overall resistivity of the anode guide rod assembly, thus achieving energy conservation and consumption reduction. Simultaneously, eliminating the aluminum-steel explosive welding block could also save companies some material costs.

[0004] In addition, some companies have attempted to use arc welding technology to weld the anode guide rod and steel claw. This method can achieve the goal of eliminating the need for aluminum-steel explosive blocks. The process involves first using arc welding to braze a layer of aluminum onto the end face of the steel claw, and then performing aluminum-aluminum welding on the anode aluminum guide rod and the end face of the steel claw. This process, which uses arc welding to braze an aluminum platform onto steel, is technically challenging and requires the experience of engineers or technical construction personnel, making it difficult to guarantee product quality. Therefore, the aforementioned companies have introduced robotic technology to simplify the welding process, but this undoubtedly increases the manufacturing cost of the anode guide rod and steel claw significantly. Furthermore, although the new technology eliminates explosive blocks and reduces some production costs, relying on multiple arc welding passes to braze an aluminum platform onto a large cross-section steel claw is inefficient, unfavorable for large-scale rapid production, and cannot completely solve the energy-saving and consumption-reducing problems of electrolytic aluminum enterprises. Utility Model Content

[0005] The embodiments of this application provide a high-frequency induction brazing device suitable for anode aluminum guide rods and steel claws, which can significantly reduce the resistivity at the connection between the anode aluminum guide rod and the steel claws, improve conductivity and structural strength, and further improve the working efficiency of brazing while reducing equipment investment costs.

[0006] The embodiments of this application employ the following technical solutions:

[0007] In a first aspect, embodiments of this application provide a method for high-frequency induction brazing of an aluminum anode guide rod and a steel claw, comprising: pre-treating the surfaces to be welded of the aluminum anode guide rod and the steel claw, and then arranging a high-frequency electromagnetic induction heating coil around the steel claw; applying a layer of brazing filler metal to the surface to be welded of the steel claw, using the induced current generated by the high-frequency electromagnetic induction heating coil to heat the steel claw to a first preset temperature, controlling the heating time to a first preset time, so that the brazing filler metal melts and diffuses to the surface to be welded of the steel claw, thereby obtaining a steel claw welding precursor; wherein the brazing filler metal includes Al, Cu, Mg, Si metallic elements and Ce, La rare elements; placing the aluminum anode guide rod on the welding surface of the steel claw welding precursor, and applying a layer of brazing filler metal between the welding surface of the steel claw welding precursor and the aluminum anode guide rod, again using the induced current generated by the high-frequency electromagnetic induction heating coil to heat the steel claw to a second preset temperature, controlling the heating time to a second preset time, thereby achieving a high-frequency induction brazing connection between the aluminum anode guide rod and the steel claw.

[0008] In this embodiment, the high-frequency induction brazing method mainly utilizes the principle of high-frequency electromagnetic induction heating. The induced current generated by the induction heating coil heats the metal surface to the required brazing temperature, achieving an efficient connection between the anode aluminum guide rod and the steel claw. Specifically, firstly, the surfaces to be welded on the anode aluminum guide rod and the steel claw are pretreated to remove surface oxides, contaminants, etc., 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, and rare elements such as Ce and La, is applied to the surface to be welded on the steel claw. Using the induced current generated by the high-frequency electromagnetic induction heating coil, the steel claw is heated to a first preset temperature, and the heating time is controlled to a first preset time, allowing the brazing filler metal to melt and diffuse onto the surface to be welded on the steel claw, forming the welding precursor of the steel claw. The anode aluminum guide rod is placed between the heated welding precursor surfaces of the steel claw, and another layer of brazing filler metal is applied. Under the action of the heating coil, the steel claw continues to be heated to a second preset temperature, causing the brazing filler metal to melt and form a strong connection between the surfaces of the anode aluminum guide rod and the steel claw. Through high-frequency induction heating technology, the high-frequency induction brazing connection between the anode aluminum guide rod and the steel claw is finally achieved, resulting in high structural strength, good conductivity, and stable connection.

[0009] High-frequency induction brazing technology avoids the high interfacial resistivity problem inherent in aluminum-steel explosive welding. In aluminum-steel explosive welding, the weld interface often exhibits significant resistance. High-frequency induction brazing, through the melting of the high-temperature filler metal, provides a more uniform interface, effectively reducing the overall resistivity of the anode rod assembly. This technology ensures a tighter connection between the anode aluminum rod and the steel claw, resulting in a welded joint with higher conductivity and structural strength. A good connection improves current transmission efficiency, enhances electrolysis efficiency, and maintains stable performance of the anode rod assembly during long-term operation. While aluminum-steel explosive welding sheets are costly to manufacture, this technology eliminates the need for them, directly connecting the anode aluminum rod and steel claw via high-frequency induction brazing, saving material costs, especially in large-scale production where it significantly reduces production costs. High-frequency induction brazing offers rapid heating and precise temperature control, enabling the welding process between the anode aluminum rod and steel claw in a shorter time. This is more efficient than traditional arc welding or aluminum-steel explosive welding, making it suitable for large-scale, rapid production, thus solving the problem of low production efficiency faced by electrolytic aluminum enterprises. Compared to arc welding technology, which requires complex processes and high technical requirements, high-frequency induction brazing technology is relatively simple, has lower equipment costs, and a higher degree of automation, reducing reliance on highly skilled workers. Furthermore, this technology does not require complex robotic systems, further reducing equipment investment.

[0010] As one possible implementation, the method further includes: covering the area to be welded of the steel claw with a welding mold; wherein the welding mold includes a graphite mold and a steel mold.

[0011] As one feasible implementation, 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, neutralizing with 10% NaOH and drying, and / or sandblasting the surface of the steel claw to be welded; cleaning the surface of the anode aluminum guide rod to be welded with an ultrasonic cleaner to remove oxides and oil stains from the surface of the anode aluminum guide rod to be welded.

[0012] As one feasible implementation, the method further includes: weighing Cu 20%, Mg 4-8%, Si 8-10%, Ce 0.05%-0.3%, La 0.2%-0.8% by weight, with the balance being Al, stirring evenly, and then melting the molten metal. The molten metal is then cooled and solidified to obtain a brazing filler metal.

[0013] As one feasible implementation, the stirring time is 60-120 s; the melting temperature is 680 ℃ and the melting time is 60-120 s.

[0014] As one possible implementation, the melting method includes either plasma arc heating melting or induction furnace heating.

[0015] As one feasible implementation, the first preset temperature is 800-970℃ and the first preset time is 8-12s.

[0016] As one feasible implementation, the second preset temperature is 800-970℃ and the second preset time is 8-12s.

[0017] Secondly, embodiments of this application also provide a high-frequency induction brazing device suitable for anode aluminum guide rods and steel claws, comprising: a welding mold surrounding the area to be welded of the anode aluminum guide rod and the steel claw; and a high-frequency electromagnetic induction heating coil disposed around the welding mold for heating the steel claw and the anode aluminum guide rod.

[0018] As one possible implementation, the welding mold includes a graphite mold and a steel mold.

[0019] As one feasible implementation, the graphite mold and the steel mold are separate molds, and the individual parts of the graphite mold and the steel mold are connected by snap-fit ​​components to form a complete welded mold.

[0020] As one possible implementation, the snap-fit ​​component includes any one of a snap pin, a snap fastener, or a snap ring.

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

[0022] As one feasible implementation, the high-frequency electromagnetic induction heating coil is processed to have an shape consistent with the welding area of ​​the anode aluminum guide rod and the steel claw, and the high-frequency electromagnetic induction heating coil is 20mm away from the surface of the steel claw material.

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

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

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

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

[0027] As one feasible implementation, the distance between the steel claw and the surfaces to be welded on the anode aluminum guide rod is 80-120mm.

[0028] As one possible implementation, the device further includes a brazing filler metal disposed between the steel claw and the anode aluminum guide rod to achieve a high-frequency induction brazing connection between the anode 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 in this application uses Al, Cu, Mg, Si metallic elements and Ce and La rare elements. Cu improves conductivity and increases the connection strength of the weld joint; Mg reduces the oxidation tendency of the filler metal and improves its wettability; Si and Al form a eutectic structure, significantly lowering the melting point of the filler metal, while Si also improves its ductility; and the rare elements Ce and La purify the molten pool, refine the grains, and improve wettability. The resulting filler metal exhibits excellent wettability and can inhibit the excessive growth of intermetallic compounds (IMCs) at the metallurgical interface, thereby improving the mechanical properties of the dissimilar metal weld joint between the aluminum anode guide rod and the steel claw, achieving efficient and reliable connection between the aluminum anode guide rod and the steel claw, and enabling wider application in the brazing industry.

[0031] Secondly, the high-frequency induction brazing method for dissimilar metals, including the anode aluminum guide rod and steel claw, provided in this application embodiment achieves induction brazing of steel / steel and induction fusion welding of aluminum / steel in stages. This method is simple, convenient, low-cost, and easy to operate, overcoming the problems of complex processes, high costs, and difficulty in control associated with aluminum-steel fusion welding and pressure welding. Attached Figure Description

[0032] The accompanying drawings used in the description of the embodiments are briefly introduced below.

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

[0034] Figure 1 A schematic flowchart of a high-frequency induction brazing method for anode aluminum guide rods and steel claws provided in an embodiment of this application is shown.

[0035] Figure 2 A schematic flowchart of another high-frequency induction brazing method for anode aluminum guide rods and steel claws provided in an embodiment of this application is shown.

[0036] Figure 3 A flowchart for solder preparation;

[0037] Figure 4 This paper shows a schematic diagram of a high-frequency induction brazing device for anode aluminum guide rods and steel claws provided in Embodiment 1 of this application.

[0038] Figure 5 This invention provides a schematic diagram of a high-frequency induction brazing device for aluminum anode guide rods and steel claws, according to Embodiment 2 of this application.

[0039] Figure 6 This paper presents a schematic diagram of a high-frequency induction brazing device for anode aluminum guide rods and steel claws, as provided in Embodiment 3 of this application. Detailed Implementation

[0040] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In the description of this specification, the references to terms such as "some implementations," "some embodiments," "exemplary," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] This application provides a high-frequency induction brazing method for aluminum anode guide rods and steel claws. The method employs a welding device to weld the aluminum anode guide rod and steel claw, and mainly includes two parts: filler metal preparation and induction welding. First, an aluminum-based filler metal is smelted according to different mass percentages of metal elements. Then, the surfaces to be welded on the steel and aluminum alloy materials are pretreated. Finally, a high-frequency induction brazing process is used to achieve a step-by-step connection between the aluminum and steel. The high-frequency induction brazing method provided in this application is simple, low-cost, and easy to operate. It overcomes the problems of complex, high-cost, and difficult-to-control processes in aluminum-steel fusion brazing and pressure welding. It improves the strength of the aluminum-steel joint, obtains an aluminum-steel welded joint with uniform weld structure and excellent mechanical properties, and achieves efficient and reliable connection of dissimilar metals such as aluminum and steel.

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

[0047] A high-frequency induction brazing method for aluminum anode guide rods and steel claws is disclosed. The welding process mainly includes the preparation of Al-based brazing filler metal and aluminum-steel welding. The Al-based brazing filler metal may be in the form of powder, block, or other similar materials.

[0048] In some embodiments, the mass percentages of each element in the Al-based solder are as follows: Cu 20%, Mg 4-8%, Si 8-10%, Ce 0.05%-0.3%, La 0.2%-0.8%, with the remainder being Al; totaling 50g. It should be noted that the raw materials for Cu, Mg, Si, and Al are metal particles with a purity of 99.9%.

[0049] Figure 1 This paper illustrates a flowchart of a high-frequency induction brazing method for anode aluminum guide rods and steel claws, provided in an embodiment of this application.

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

[0051] S101. Pre-treat the surfaces of the anode aluminum guide rod and steel claw to be welded, and then arrange high-frequency electromagnetic induction heating coils around the steel claw.

[0052] S102. A layer of brazing filler metal is applied to the surface of the steel claw to be welded. The steel claw is heated to a first preset temperature by 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 brazing filler metal melts and diffuses to the surface of the steel claw to be welded, thus obtaining the steel claw welding precursor. The brazing filler metal includes Al, Cu, Mg, Si metallic elements and Ce, La rare elements.

[0053] S103. Place the anode aluminum guide rod on the welding surface of the steel claw welding pre-body, and lay a layer of brazing filler metal between the welding surface of the steel claw welding pre-body and the anode aluminum guide rod. Then, use the induced current generated by the high-frequency electromagnetic induction heating coil to heat the steel claw to the second preset temperature, and control the heating time to the second preset time to achieve high-frequency induction brazing connection of the anode aluminum guide rod and the steel claw.

[0054] In some implementations, Figure 2 This paper illustrates a flowchart of another high-frequency induction brazing method for anode aluminum guide rods and steel claws provided in an embodiment of this application. Figure 3 This is a flowchart for solder preparation. (Example:) Figure 2 and Figure 3 As shown, the method includes the following steps:

[0055] Step 1: Weigh the 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 the powder: Pour the metal powder material weighed in Step 1 into a crucible and stir it evenly; the stirring time is 60-120 seconds.

[0057] Step 3: Preparing the brazing filler metal: The crucible is placed in a high-frequency electromagnetic induction heating coil and heated to a certain temperature for melting. The molten metal is poured into a shaping mold and cooled to form the desired shape. The heating time is 70-100 seconds. It should be noted that the shaping mold is circular in this step. In some embodiments, the shaping mold can also be rectangular, trapezoidal, triangular, or other irregular shapes, depending on the shape of the surface to be welded. This embodiment does not impose strict limitations.

[0058] Step 4: Pre-treatment of the parts to be welded: The welding surface of the anode steel claw is first soaked in 10% hydrochloric acid for 5 minutes, then rinsed with clean water, neutralized with 10% NaOH, and dried, and / or the welding surface of the steel claw is sandblasted. Then, the welding surface of the anode aluminum guide rod is cleaned with an ultrasonic cleaner to remove oxides and oil stains. In this step, sandblasting specifically includes: at room temperature (25℃), using sand made of at least one of silicon carbide, brown corundum, or garnet particles, with a spray gun pressure ≥0.3MPa and a spray gun distance ≤300mm from the material surface, thereby uniformly removing the oxide layer from the welding surface of the steel claw.

[0059] Step 5: Device setup: Place the steel claw at the bottom, surround the welding surface of the steel claw with a welding mold, then place the brazing filler metal on the upper part of the welding surface of the steel claw and inside the welding mold; then place it into the induction coil.

[0060] Step 6: Induction brazing of steel and brazing filler metal: The steel claw is heated by a high-frequency electromagnetic induction heating coil, with the temperature controlled at 800-970℃ and the heating time at 8-12s, so that the brazing filler metal melts and diffuses to achieve the connection between the steel and the brazing filler metal.

[0061] Step 7: Induction welding of aluminum and brazing filler metal: Based on step 6, place an anode aluminum guide rod on the upper part of the steel claw welding area, and place brazing filler metal between the steel claw and the anode 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 to aluminum.

[0062] Figure 4 This paper shows a schematic diagram of a high-frequency induction brazing device for anode aluminum guide rods and steel claws provided in Embodiment 1 of this application. Figure 5 This invention provides a schematic diagram of a high-frequency induction brazing device for aluminum anode guide rods and steel claws, according to Embodiment 2 of this application. Figure 6 A schematic diagram of a high-frequency induction brazing device for anode aluminum guide rods and steel claws, provided in Embodiment 3 of this application, is shown. (See also...) Figures 4 to 6 This application also provides a high-frequency induction brazing apparatus suitable for anode aluminum guide rods and steel claws, applied to the above-mentioned brazing method. The brazing apparatus mainly includes: a welding mold surrounding the welding area of ​​the anode aluminum guide rod and the steel claw; and a high-frequency electromagnetic induction heating coil disposed around the welding mold for heating the steel claw and the anode aluminum guide rod. In this embodiment, to better weld the steel claw and the anode aluminum guide rod, the distance between the welding surfaces of the steel claw and the anode aluminum guide rod is 80-120 mm, facilitating the placement of aluminum-based brazing filler metal between the welding surfaces of the steel claw and the anode 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 a single, integrated design, resulting in a welding mold with higher strength. In other embodiments, the graphite mold and the steel mold are separate components, with each component forming a complete welding mold via snap-fit ​​connections. For example, the welding mold can be a hollow cylinder or a rectangle; in this embodiment, the specific shape of the welding mold is not strictly limited.

[0064] For example, taking a graphite mold as an example, a split-type mold refers to a graphite mold that is assembled from multiple parts. For instance, a graphite mold includes a front sealing mold, a rear sealing mold, and a bottom sealing mold (not shown in the figure) that are surrounded and fixed around the welding area of ​​the anode aluminum guide rod and the steel claw. Alternatively, the welding mold can be divided into two hollow semi-cylinders, and then the two hollow semi-cylinders can be fixed at the welding area to facilitate subsequent welding operations. For example, the two hollow semi-cylinders can be glued to the welding area; or, the opposite side walls of the two hollow semi-cylinders can extend outwards to form ear plates, and then the two opposing ear plates can be fixed at the welding area with screws; or, a slot can be provided on the side wall of one hollow semi-cylinder, and a buckle that can be engaged in the slot can be provided on the opposite side wall of the other hollow semi-cylinder, so that the two hollow semi-cylinders can be fixed at the welding area through the slot and the buckle. This application does not limit this.

[0065] For example, snap-fit ​​components include any one of pins, buckles, and rings. A pin is a small metal pin, typically used in conjunction with a hole, to secure two parts of a mold together. Pins are characterized by their ability to easily connect or separate the mold by insertion or removal. Buckles are common metal components used for quickly locking two parts. Buckles are simple and convenient in design, achieving automatic locking through elasticity, and can be used to connect separate parts of welding molds. Rings are annular snap-fit ​​components commonly used to lock two parts together through internal and external mating. Common rings include internal and external rings; during use, the ring is pressed into or springs into a corresponding groove, securely connecting the parts. In this embodiment, the form of the snap-fit ​​component is not strictly limited.

[0066] In some embodiments, the high-frequency electromagnetic induction heating coil is a hollow copper tube, which, after processing, has an shape consistent with the welding area of ​​the anode aluminum guide rod and the steel claw, and the high-frequency electromagnetic induction heating coil is 20mm away from the surface of the steel claw material. Exemplarily, the high-frequency electromagnetic induction heating coil includes an arc-shaped induction coil and a square induction coil. The induction power of the high-frequency electromagnetic induction heating coil is 0-40kW, the induction current is 70-90A, and the induction heating time is 8-130s.

[0067] To further illustrate this application, the technical solutions provided by this application are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of this application.

[0068] Example 1

[0069] A high-frequency induction brazing method for anode aluminum guide rods and steel claws is applied to... Figure 4 The welding apparatus shown includes the following steps:

[0070] 1) Weigh and proportion the raw metals as follows: Cu = 10g; Mg = 2g; Si = 4g; Ce = 0.05g; La = 0.1g; Al = 33.85g; total 50g.

[0071] 2) Pure metal raw materials Cu, Mg, Si, Al, Ce and La are loaded into a graphite crucible. The crucible is placed in a high-frequency electromagnetic induction heating coil. The heating coil is heated to 950°C for 76 seconds. The mixture is stirred continuously for 85 seconds to melt the metal raw materials.

[0072] 3) After completing the above melting steps, remove the graphite crucible from the high-frequency electromagnetic induction heating coil, pour it into the shaping mold, and cool the liquid alloy to form an Al-based brazing filler 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 anode aluminum guide rod to be welded to remove oxides and oil stains.

[0074] 5) Place the steel claw at the bottom, surround the welding surface of the steel claw with a graphite mold, and then place the brazing filler metal on the upper part of the welding surface of the steel claw and inside the graphite mold; then place it into the high-frequency electromagnetic induction heating coil.

[0075] 6) A high-frequency electromagnetic induction heating coil is used for heating, with the temperature controlled at 900℃ and the heating time at 12s, so that the brazing filler metal melts and diffuses to achieve the connection between the steel and the brazing filler metal.

[0076] 7) Based on step 6, place an anode aluminum guide rod on the upper part of the steel claw, and place brazing filler metal between the steel claw and the anode aluminum guide rod; use a high-frequency electromagnetic induction heating coil, control the temperature to 900℃ and the heating time to 10s, realize the induction welding of aluminum to aluminum, and complete the connection of aluminum / steel dissimilar metals.

[0077] Example 2

[0078] A high-frequency induction brazing method for anode aluminum guide rods and steel claws is applied to... Figure 5 The welding apparatus shown includes the following steps:

[0079] 1) Weigh and proportion the raw metals as follows: Cu = 10g; Mg = 3g; Si = 6g; Ce = 0.1g; La = 0.2g; Al = 30.7g; total 50g.

[0080] 2) Pure metal raw materials Cu, Mg, Si, Al, Ce and La are loaded into a graphite crucible. The crucible is placed in a high-frequency electromagnetic induction heating coil. The heating coil is heated to 680℃ for 92s. The mixture is stirred continuously for 112s to melt the metal raw materials.

[0081] 3) After completing the above melting steps, remove the graphite crucible from the high-frequency electromagnetic induction heating coil, pour it into the shaping mold, and cool the liquid alloy to form an Al-based brazing filler 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 anode aluminum guide rod to be welded to remove oxides and oil stains.

[0083] 5) Place the steel claw at the bottom, surround the welding surface of the steel claw with a steel mold, and then place the brazing filler metal on the upper part of the welding surface of the steel claw and inside the steel mold; then place it into the high-frequency electromagnetic induction heating coil.

[0084] 6) A high-frequency electromagnetic induction heating coil is used for heating, with the temperature controlled at 970℃ and the heating time at 8s, so that the brazing filler metal melts and diffuses to achieve the connection between the steel and the brazing filler metal.

[0085] 7) Based on step 6, place an anode aluminum guide rod on the upper part of the steel claw, and place brazing filler metal between the steel claw and the anode aluminum guide rod; use a high-frequency electromagnetic induction heating coil, control the temperature to 970℃ and the heating time to 8s, realize the induction welding of aluminum and aluminum, and complete the connection of aluminum / steel dissimilar metals.

[0086] Example 3

[0087] A high-frequency induction brazing method for anode aluminum guide rods and steel claws is applied to... Figure 6 The welding apparatus shown includes the following steps:

[0088] 1) Weigh and proportion the raw metals as follows: Cu = 10g; Mg = 4g; Si = 5g; Ce = 0.15g; La = 0.4g; Al = 30.45g; total 50g.

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

[0090] 3) After completing the above melting steps, remove the graphite crucible from the high-frequency electromagnetic induction heating coil, pour it into the shaping mold, and cool the liquid alloy to form an Al-based brazing filler 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 anode aluminum guide rod to be welded to remove oxides and oil stains.

[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 brazing filler metal 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, with the temperature controlled at 800℃ and the heating time at 8s, so that the brazing filler metal melts and diffuses to achieve the connection between the steel and the brazing filler metal.

[0094] 7) Building upon step 6, place an anode aluminum guide rod on top of the steel claw and place brazing filler metal between the steel claw and the anode aluminum guide rod; use a high-frequency electromagnetic induction heating coil, controlling the temperature at 800℃ and the heating time at 12s, to achieve induction welding of aluminum to aluminum, completing the connection of dissimilar metals aluminum / steel. It should be noted that in this step, since a welding mold is not used to fix the welding area of ​​the steel claw and the anode aluminum guide rod, a steel rod is used to assist in fixing the anode aluminum guide rod on the upper side of the steel claw to reduce the possibility of displacement during the brazing process, in order to ensure stable welding.

[0095] This application provides a high-frequency induction brazing device for anode aluminum guide rods and steel claws. This device solves many problems associated with traditional welding methods through efficient and low-cost technology, particularly in reducing resistance, improving electrolysis efficiency, and saving materials and production costs. Furthermore, its efficient production process and relatively simple technology provide a feasible energy-saving and consumption-reducing solution for electrolytic aluminum enterprises. Therefore, this technology is not only significant 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 only used to illustrate the technical solutions of this application. Those skilled in the art should understand that although this application has been described in detail with reference to the foregoing embodiments, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions in the embodiments of this application.

Claims

1. A high-frequency induction brazing device suitable for anode aluminum guide rods and steel claws, characterized in that, include: A welding mold is used to surround the area to be welded between the anode aluminum guide rod and the steel claw. A high-frequency electromagnetic induction heating coil is disposed on the periphery of the welding mold and is used to heat the steel claw and the anode aluminum guide rod.

2. The apparatus according to claim 1, characterized in that, The welding mold includes a graphite mold and a steel mold.

3. The apparatus according to claim 2, characterized in that, The graphite mold and the steel mold are separate molds, and the individual parts of the graphite mold and the steel mold are connected by snap-fit ​​components to form a complete welded mold.

4. The device according to claim 3, wherein the snap-fit ​​component includes any one of a snap pin, a snap fastener, or a snap ring.

5. The apparatus according to any one of claims 1-4, characterized in that, The high-frequency electromagnetic induction heating coil is a hollow tube made of copper.

6. The apparatus according to claim 5, characterized in that, The high-frequency electromagnetic induction heating coil, after processing, has an shape consistent with the welding area of ​​the anode aluminum guide rod and the steel claw, and the high-frequency electromagnetic induction heating coil is 20mm away from the surface of the steel claw material.

7. The apparatus according to claim 5, characterized in that, The high-frequency electromagnetic induction heating coil includes an arc-shaped induction coil and a square induction coil.

8. The apparatus according to claim 5, characterized in that, The induction power of the high-frequency electromagnetic induction heating coil is 0-40kW.

9. The apparatus according to claim 5, characterized in that, The induced current of the high-frequency electromagnetic induction heating coil is 70-90A.

10. The apparatus according to claim 5, characterized in that, The induction heating time of the high-frequency electromagnetic induction heating coil is 8-130s.

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