Indirect heating resistance brazing device and method

Abstract

The present invention discloses an indirect heating resistance brazing device and method, which relates to the field of welding technology. An upper electrode, a conductive cylinder, and a lower electrode are arranged in sequence from top to bottom. A mounting groove is provided on the upper portion of the lower electrode, and the top of the mounting groove is connected to the bottom of the conductive cylinder. An elastic component is provided in the mounting groove, a lower gasket is provided at the top of the elastic component, and an upper gasket is provided in the conductive cylinder and is located at the bottom of the upper electrode. The material to be welded is placed between the lower gasket and the upper gasket. During operation, the lower gasket and the upper gasket of appropriate height are selected according to the required pressure applied to the material to be welded and the axial position of the brazing surface relative to the conductive cylinder; the elastic component is placed in the mounting groove, and the lower gasket, the material to be welded, and the upper gasket are placed in sequence from bottom to top above the elastic component. The resistance welding equipment drives the upper electrode to move downward and then contact the conductive cylinder. The device and method reduce the matching requirements of the parent material, improve the quality of the welded joint, and expand the scope of application of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and in particular to an indirect heating resistance brazing device and method. Background Art

[0002] Resistance brazing is mainly divided into direct heating resistance brazing and indirect heating resistance brazing. Among them, direct heating resistance brazing is more widely studied. In direct heating resistance brazing, the electrodes are pressed against the base material to be welded. The current passes through the base material and generates resistance heat on the brazing surface to heat the brazing filler metal. After the brazing filler metal melts, it wets, flows capillary, fills the gaps in the base material, and diffuses to complete the welding of the base material. Its characteristic is that it can quickly melt the brazing filler metal in a short time, but it requires the brazing surface to be tightly matched. However, the electrode surface has no positioning, and it is difficult to accurately dock the base material during welding. In addition, a certain amount of pressure must be applied to the materials to be welded. However, when the welding pressure is too high, the molten brazing filler metal will be discharged from the weld, resulting in defects in the joint and reducing the quality of the joint. In addition, for some brazing fluxes that are difficult to conduct electricity, direct heating resistance brazing has difficulty completing the welding work. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides an indirect heating resistance brazing device and method, which reduces the matching requirements of the parent material, improves the quality of the welded joint, and expands the scope of application of the device.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides an indirect heating resistance brazing device, comprising an upper electrode, a lower electrode, a conductive cylinder, an elastic component, an upper gasket and a lower gasket, wherein the upper electrode, the conductive cylinder and the lower electrode are arranged in sequence from top to bottom, the upper portion of the lower electrode is provided with a mounting groove, the top of the mounting groove is connected to the bottom of the conductive cylinder, the elastic component is arranged in the mounting groove, the lower gasket is arranged at the top end of the elastic component, the upper gasket is arranged in the conductive cylinder and located at the bottom end of the upper electrode, and the material to be welded is placed between the lower gasket and the upper gasket.

[0006] Optionally, a cooling component is provided outside the lower electrode.

[0007] Optionally, the cooling component is a copper hose, which is wound around the outside of the lower electrode and is used to allow cooling water to flow into the copper hose.

[0008] Optionally, a receiving groove is provided on the upper portion of the lower electrode, the top of the mounting groove is connected to the bottom of the receiving groove, and the lower portion of the conductive tube is used to be snap-fitted into the receiving groove.

[0009] Optionally, the upper electrode includes a main body column and a positioning column sequentially connected from top to bottom, and the positioning column is used to extend to the upper part of the conductive cylinder.

[0010] Optionally, the conductive tube is a cylinder, the accommodating groove is a circular groove, and the positioning column is a cylinder.

[0011] Optionally, the conductive tube is made of graphite material, and the upper electrode and the lower electrode are made of chromium-zirconium-copper material.

[0012] Optionally, the upper gasket and the lower gasket are made of alumina ceramic material.

[0013] Optionally, the elastic component is a spring.

[0014] The present invention also provides a welding method based on an indirect heating resistance brazing device, comprising the following steps:

[0015] Step 1: Select the lower gasket and the upper gasket of appropriate height according to the required pressure applied to the material to be welded and the axial position of the brazing surface relative to the conductive cylinder;

[0016] Step 2: Remove the upper electrode from the conductive cylinder, place the elastic component in the mounting groove, and place the lower gasket, the material to be welded, and the upper gasket in order from bottom to top on top of the elastic component;

[0017] Step 3: Installing the upper electrode and the lower electrode on a resistance welding device;

[0018] Step 4: Start the resistance welding equipment, which drives the upper electrode to move downward and contact the conductive cylinder, and then energizes and heats the conductive cylinder, thereby heating the material to be welded and the solder. When the conductive cylinder reaches a certain temperature, the power is turned off to complete the welding work.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] In the indirect heating resistance brazing device of the present invention, the upper electrode, the conductive cylinder and the lower electrode are arranged in sequence from top to bottom, and the upper part of the lower electrode is provided with a mounting groove. During operation, the lower gasket and the upper gasket of appropriate height are selected according to the required pressure applied to the material to be welded and the axial position of the brazing surface relative to the conductive cylinder; an elastic component is placed in the mounting groove, and the lower gasket, the material to be welded and the upper gasket are placed in sequence from bottom to top above the elastic component. The upper electrode and the lower electrode are installed on the resistance welding device, and then the resistance welding device is started. The resistance welding device drives the upper electrode to move downward and then contact the conductive cylinder, and the conductive cylinder is electrically heated. The device places certain limits on the materials to be welded, reducing the matching requirements of the parent material. At the same time, the brazing surface position and welding pressure can be adjusted by adjusting the height of the upper gasket and the lower gasket, which can reduce the discharge of molten brazing material, reduce the porosity during the welding process, and improve the quality of the welded joint. During the welding process, due to the indirect heating method, the welding heating center will not be offset between dissimilar materials with large differences in physical properties. Some solid brazing fluxes that are difficult to conduct electricity can also be used, thereby improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A three-dimensional structural diagram of the indirect heating resistance brazing device provided by the present invention;

[0023] Figure 2 This is a cross-sectional view of the indirect heating resistance brazing device provided by the present invention.

[0024] Explanation of the accompanying drawings: 100, indirect heating resistance brazing device; 1, upper electrode; 101, first cylinder; 102, second cylinder; 103, positioning column; 2, lower electrode; 201, third cylinder; 202, fourth cylinder; 203, mounting groove; 3, conductive cylinder; 4, elastic component; 5, upper gasket; 6, lower gasket; 7, upper base material; 8, lower base material; 9, solder; 10, cooling component. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide an indirect heating resistance brazing device and method, which reduces the matching requirements of the parent material, improves the quality of the welded joint, and expands the scope of application of the device.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-Figure 2 As shown, this embodiment provides an indirect heating resistance brazing device 100, comprising an upper electrode 1, a lower electrode 2, a conductive cylinder 3, an elastic component 4, an upper gasket 5, and a lower gasket 6. The upper electrode 1, the conductive cylinder 3, and the lower electrode 2 are arranged sequentially from top to bottom and are coaxially arranged. A mounting groove 203 is provided on the upper portion of the lower electrode 2, the top of which is connected to the bottom of the conductive cylinder 3. The elastic component 4 is disposed in the mounting groove 203, the lower gasket 6 is disposed at the top of the elastic component 4, the upper gasket 5 is disposed in the conductive cylinder 3 and is located at the bottom of the upper electrode 1, and the material to be welded is placed between the lower gasket 6 and the upper gasket 5. The material to be welded includes a lower base material 8 and an upper base material 7, which are arranged sequentially from bottom to top. The brazing material 9 is placed between the materials to be welded.

[0029] In this embodiment, a certain limit is placed on the material to be welded, which reduces the matching requirements of the parent material. At the same time, the position of the brazing surface and the welding pressure can be adjusted by adjusting the height of the upper gasket 5 and the lower gasket 6, which can reduce the discharge amount of molten brazing material, reduce the porosity during the welding process, and improve the quality of the welded joint. During the welding process, due to the indirect heating method, the welding heating center will not be offset between dissimilar materials with large differences in physical properties. Some solid brazing fluxes that are difficult to conduct electricity can also be used, thereby improving the scope of application of the device.

[0030] In this embodiment, a cooling component 10 is provided outside the lower electrode 2 , and the cooling component 10 is used to cool the lower electrode 2 and the elastic component 4 .

[0031] In this specific embodiment, the cooling component 10 is a copper hose, which is wrapped around the outside of the lower electrode 2 and welded to the outer wall of the lower electrode 2. The copper hose is used to pass cooling water.

[0032] A receiving groove is provided on the upper part of the lower electrode 2, and the receiving groove is located above the mounting groove 203. The top of the mounting groove 203 is connected to the bottom of the receiving groove. The lower part of the conductive tube 3 is used to be snapped into the receiving groove, thereby realizing the coaxial arrangement of the conductive tube 3 and the lower electrode 2.

[0033] The upper electrode 1 includes a main column and a positioning column 103 connected in sequence from top to bottom. The positioning column 103 is used to extend to the upper part of the conductive tube 3, thereby achieving a coaxial arrangement of the upper electrode 1 and the conductive tube 3.

[0034] In this embodiment, the conductive tube 3 is a cylinder, the receiving groove is a circular groove, the positioning post 103 is a cylinder, and the outer diameter of the positioning post 103 is slightly smaller than the inner diameter of the conductive tube 3. The mounting groove 203 is a circular groove, and the inner diameter of the mounting groove 203 is smaller than the inner diameter of the receiving groove.

[0035] Specifically, the main column includes a first cylinder 101 and a second cylinder 102 connected in sequence from top to bottom. A positioning column 103 is provided at the lower part of the second cylinder 102. The outer diameters of the positioning column 103, the first cylinder 101 and the second cylinder 102 gradually increase.

[0036] Specifically, the lower electrode 2 includes a third cylinder 201 and a fourth cylinder 202 connected in sequence from top to bottom. The outer diameter of the third cylinder 201 is larger than the outer diameter of the fourth cylinder 202. The accommodating groove and the mounting groove 203 are both arranged in the upper part of the third cylinder 201, and the copper hose is wrapped around the outside of the third cylinder 201.

[0037] In this embodiment, the conductive tube 3 is made of graphite, and the upper electrode 1 and the lower electrode 2 are made of chromium-zirconium-copper material. Chromium-zirconium-copper material has excellent conductivity, high hardness, and wear resistance; it has low loss during use, which reduces costs.

[0038] In this specific embodiment, the upper gasket 5 and the lower gasket 6 are made of alumina ceramic material, which is a high-temperature resistant material.

[0039] In this embodiment, the elastic component 4 is a spring.

[0040] This embodiment also provides a welding method based on the indirect heating resistance brazing device 100, comprising the following steps:

[0041] Step 1: Select the lower gasket 6 and the upper gasket 5 of appropriate height according to the required pressure applied to the material to be welded and the axial position of the brazing surface relative to the conductive tube 3; the brazing surface is the surface where the brazing material 9 is located between the lower base material 8 and the upper base material 7. By using lower gaskets 6 and upper gaskets 5 of different heights, the compression amount of the elastic component 4 can be adjusted, thereby adjusting the axial position of the brazing surface relative to the conductive tube 3 and the pressure applied to the material to be welded.

[0042] Step 2: Remove the upper electrode 1 from the conductive tube 3, place the elastic component 4 in the mounting groove 203, and place the lower gasket 6, the material to be welded, and the upper gasket 5 in order from bottom to top above the elastic component 4; specifically, before placing the material to be welded, grind and clean the material to be welded and the solder 9, and evenly apply solder flux to one end of the upper base material 7 and the lower base material 8 to be welded.

[0043] Step 3: Install the upper electrode 1 and lower electrode 2 on the resistance welding equipment. Initially, the upper electrode 1 and conductive tube 3 are not in contact. In this embodiment, the upper electrode 1 and lower electrode 2 are inserted into the upper and lower grooves of the resistance welding equipment, respectively. The copper hose is adjusted and cooling water is introduced into the lower end and discharged from the upper end to cool the lower electrode 2 and spring, preventing the spring from failing due to high temperature.

[0044] Step 4: Start the resistance welding equipment. The resistance welding equipment drives the upper electrode 1 downward, bringing it into contact with the conductive cylinder 3. The conductive cylinder 3 is then electrically heated, thereby heating the material to be welded and the solder 9, melting the solder 9. When the conductive cylinder 3 reaches a certain temperature, the power is turned off to complete the welding process. Specifically, the resistance welding equipment drives the upper electrode 1 downward, bringing the lower end surface of the second cylinder 102 into contact with the conductive cylinder 3. In this embodiment, a temperature measuring component is used to measure the temperature of the conductive cylinder 3. During the welding process, the temperature of the conductive cylinder 3 is determined by the solder 9. The heating temperature must be 30-80°C above the liquidus of the solder 9 to ensure wettability and fluidity of the solder 9.

[0045] After welding is completed, the upper electrode 1 is lifted up along with the resistance welding equipment, and the materials to be welded rise under the elastic force of the elastic component 4 , and the welded upper and lower base materials 7 and 8 can be taken out from the upper part of the conductive cylinder 3 .

[0046] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An indirect heating resistance brazing device, characterized in that: It includes an upper electrode, a lower electrode, a conductive tube, an elastic component, an upper gasket and a lower gasket. The upper electrode, the conductive tube and the lower electrode are arranged in sequence from top to bottom. The upper part of the lower electrode is provided with a mounting groove, the top of the mounting groove is connected with the bottom of the conductive tube, the elastic component is arranged in the mounting groove, the lower gasket is arranged at the top of the elastic component, the upper gasket is arranged in the conductive tube and is located at the bottom end of the upper electrode, and the material to be welded is placed between the lower gasket and the upper gasket.

2. The indirect heating resistance brazing device according to claim 1, characterized in that: A cooling component is provided outside the lower electrode.

3. The indirect heating resistance brazing device according to claim 2, characterized in that: The cooling component is a copper hose, which is wound around the outside of the lower electrode and is used to allow cooling water to flow into the copper hose.

4. The indirect heating resistance brazing device according to claim 1, characterized in that: An accommodating groove is provided on the upper portion of the lower electrode, the top of the mounting groove is connected to the bottom of the accommodating groove, and the lower portion of the conductive tube is used to be clamped in the accommodating groove.

5. The indirect heating resistance brazing device according to claim 4, characterized in that: The upper electrode includes a main body column and a positioning column connected in sequence from top to bottom, and the positioning column is used to extend to the upper part of the conductive cylinder.

6. The indirect heating resistance brazing device according to claim 5, characterized in that: The conductive cylinder is a cylinder, the accommodating groove is a circular groove, and the positioning column is a cylinder.

7. The indirect heating resistance brazing device according to claim 1, characterized in that: The conductive tube is made of graphite material, and the upper electrode and the lower electrode are made of chromium-zirconium-copper material.

8. The indirect heating resistance brazing device according to claim 1, characterized in that: The upper gasket and the lower gasket are made of alumina ceramic material.

9. The indirect heating resistance brazing device according to claim 1, characterized in that: The elastic component is a spring.

10. A welding method based on the indirect heating resistance brazing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Select the lower gasket and the upper gasket of appropriate height according to the required pressure applied to the material to be welded and the axial position of the brazing surface relative to the conductive cylinder; Step 2: Remove the upper electrode from the conductive cylinder, place the elastic component in the mounting groove, and place the lower gasket, the material to be welded, and the upper gasket in order from bottom to top on top of the elastic component; Step 3: Installing the upper electrode and the lower electrode on a resistance welding device; Step 4: Start the resistance welding equipment, which drives the upper electrode to move downward and contact the conductive cylinder, and then energizes and heats the conductive cylinder, thereby heating the material to be welded and the solder. When the conductive cylinder reaches a certain temperature, the power is turned off to complete the welding work.

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