A welding apparatus and method for 304 stainless steel sheet and copper tungsten contact

Abstract

The application discloses a kind of 304 stainless steel sheet and copper tungsten contact welding device and method, and technical solution points include device ontology, the device ontology is equipped with the support base component and sheet clamp component compatible with 304 stainless steel sheet, 304 stainless steel sheet side and support base component upper portion are mutually abutted and connected, and two pieces of copper tungsten contact are placed, and the other side is detachably connected with sheet clamp component, support base component is equipped with contact side pressure component, heating assembly and detection assembly are further equipped on support base component upper portion, and heating assembly is equipped with heating coil located just above ceramic base, including the following steps: S1, pretreatment preparation;S2, positioning and fixing;S3, detection and adjustment;S4, product welding;S5, product blanking.The application improves welding effect, avoids the problem of weld collapse and deformation, also improves connection strength and reliability, reduces human factor interference, improves production efficiency and process consistency.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and specifically to a welding apparatus and method for welding 304 stainless steel sheet to copper-tungsten contacts. Background Technology

[0002] 304 stainless steel possesses excellent corrosion resistance and comprehensive mechanical properties, making it widely used in high-end manufacturing fields such as electronics, medical devices, and precision instruments. Its thin-plate materials are also a common base material for precision components. Butt welding of thin plates is a critical process in the processing of these components. Due to the thermal conductivity and hot-melt properties of stainless steel, defects such as thermal deformation, burn-through, weld collapse, and insufficient joint strength are prone to occur during welding. Furthermore, traditional welding processes such as arc welding and laser welding involve concentrated heat input and difficult-to-control heat-affected zones, further exacerbating the deformation problem in thin-plate welding and failing to meet the forming and performance requirements of precision components.

[0003] Copper-tungsten alloy (CuW) possesses excellent thermal conductivity, electrical conductivity, and wear resistance, making it a mainstream contact material for precision electrical components. However, CuW and 304 stainless steel are dissimilar metals with significant differences in key physical parameters such as thermal expansion coefficients and melting points, resulting in poor property compatibility and extremely high welding difficulty. Currently, it is common practice to weld CuW contacts to the side of thin 304 stainless steel plates to form side-joints. This side-joint structure of dissimilar materials presents several inherent technical challenges: 1. Gap-sensitive defects: When workpieces are assembled, even small gap deviations can directly affect the capillary filling effect of the brazing filler metal, resulting in uneven distribution of the brazing filler metal. In areas with larger gaps, weld collapse is more likely to occur, which not only damages the weld formation but also reduces the effective load-bearing area of ​​the weld and lowers the joint's load-bearing capacity.

[0004] 2. Stress and Deformation: During the local welding heating process, the copper-tungsten alloy and 304 stainless steel have poor thermal deformation compatibility, which will generate large residual internal stress in the joint and thin plate matrix, causing the thin plate to warp and deform, resulting in the component's dimensional accuracy and form and position tolerances failing to meet the standards.

[0005] 3. Poor soldering and low strength: Under conventional processes, the brazing filler metal is difficult to fully spread and wet the welding interface, failing to form a dense and uniform metallurgical bond, which easily leads to defects such as poor soldering and lack of fusion. Moreover, the strength of welded joints prepared by traditional processes fluctuates greatly, making it difficult to consistently guarantee the reliability and service life of the connection between the contact point and the thin plate structure.

[0006] 4. Poor process consistency: Existing welding operations rely heavily on manual operation, making it impossible to accurately and uniformly control key parameters such as assembly pressure, brazing filler material quantity and placement, heating temperature and duration. This results in large differences in welding quality between batches of products, significant fluctuations in the pass rate, and insufficient mass production stability.

[0007] 5. Flatness not up to standard: Uneven force on both sides of the workpiece during welding can easily cause the copper-tungsten contacts to bulge upwards and deform; subsequent grinding and correction can easily damage the component base and precision dimensions, increase processing difficulty, and fail to meet the assembly accuracy requirements of high-end precision equipment.

[0008] Induction brazing offers advantages such as rapid heating, precise localized heating, and a small heat-affected zone, which can improve the overall heat deformation problem of traditional welding to a certain extent and is gradually being applied in the field of dissimilar metal welding. However, for the special structure of dissimilar butt welding between copper-tungsten alloy and 304 stainless steel thin plates, existing induction brazing technology lacks a suitable pressure compensation control mechanism and dedicated positioning tooling. It cannot specifically solve core problems such as gap collapse, stress deformation, and flatness deviation, making it difficult to achieve high-quality and stable mass production of such precision dissimilar welded structures.

[0009] In summary, the existing welding process for butt welding of 304 stainless steel sheet to copper-tungsten contact surfaces generally suffers from technical drawbacks such as poor forming quality, low dimensional accuracy, unstable joint performance, and poor mass production consistency. These drawbacks cannot meet the production and use requirements of precision components. Therefore, it is urgent to improve and optimize the existing welding process and supporting equipment. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this invention provides a welding device and method for 304 stainless steel sheet and copper-tungsten contacts. By cooperating with a support base assembly, a contact side pressure assembly, a heating assembly, and a detection assembly, the welding effect of the 304 stainless steel sheet and copper-tungsten contacts is improved, while avoiding weld collapse and deformation. It also improves the connection strength and reliability at the welded joint, and achieves standardization and semi-automation in the welding process, reducing human interference and improving production efficiency and process consistency.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a welding device for 304 stainless steel sheet and copper-tungsten contacts, comprising a device body, wherein the device body is provided with a support base assembly and a sheet clamp assembly adapted to the 304 stainless steel sheet, one side of the 304 stainless steel sheet is abutted and connected to the upper part of the support base assembly and two copper-tungsten contacts are placed thereon, and the other side is detachably connected to the sheet clamp assembly, the support base assembly is provided with a contact side pressing assembly adapted to the two copper-tungsten contacts, and a heating assembly and a detection assembly are also provided above the support base assembly, wherein the heating assembly is provided with a heating coil located directly above the ceramic base.

[0012] By adopting the above technical solution, the support base assembly and the thin plate clamp assembly fix the 304 stainless steel sheet, the contact side pressure assembly clamps and fixes the copper-tungsten contacts, and the heating assembly and the detection assembly heat and detect the welded parts to improve the welding effect of the 304 stainless steel sheet and the copper-tungsten contacts, resulting in a tight weld.

[0013] The present invention is further configured such that: the support base assembly includes a ceramic base with a base cylinder and a base cylinder piston rod fixedly connected; the ceramic base has a welding step adapted to the 304 stainless steel sheet and copper-tungsten contacts; the ends of the 304 stainless steel sheet and copper-tungsten contacts abut against the inner side of the welding step; the ceramic base is fitted with a base limiting block fixedly connected to the upper part of the base cylinder; the base limiting block has a limiting groove adapted to the ceramic base.

[0014] By adopting the above technical solution, the 304 stainless steel sheet and the copper-tungsten contact end abut against the inner side of the welding step, which plays a limiting and guiding role. The base cylinder drives the ceramic base to lift and lower, so as to bring the 304 stainless steel on the ceramic base closer to the welding area. The ceramic base provides rigid support for the 304 stainless steel sheet, and its flatness is extremely high, which can prevent deformation during welding.

[0015] The invention is further configured such that: the contact side pressure assembly is provided with a parallel finger cylinder with two pneumatic fingers; the contact side pressure assembly also includes ceramic side pressure heads located on the front and rear sides of the ceramic base; the pneumatic fingers are fixedly connected to the ceramic side pressure heads by setting finger connecting blocks; the upper end of the parallel finger cylinder is fixedly connected to the clamp base plate; the parallel finger cylinder is connected to the support base assembly by setting cylinder connecting blocks; the ceramic side pressure head is provided with a side pressure groove adapted to the copper-tungsten contact; the side pressure groove is arranged in an inverted L-shaped structure; a high-temperature resistant pressure sensor is also provided in the side pressure groove; and a side pressure guide chamfer is also provided on the side pressure groove.

[0016] By adopting the above technical solution, the action and force of the pneumatic fingers are controlled by the parallel finger cylinder during the welding process to improve the welding effect. The side pressure groove is used to press the copper-tungsten contacts to prevent them from shifting position during the welding process and affecting the welding effect. The pressure sensor detects the pressing force so that the parallel finger cylinder can be adjusted, thereby improving the welding effect.

[0017] The present invention is further configured such that: the detection component includes a detection bracket and a detection cylinder fixed on the detection bracket, the detection cylinder is inverted and the lower end of the detection cylinder is provided with a detection structure connected to its piston rod, and the lower end of the detection structure is provided with a camera module and an infrared temperature module adapted to it.

[0018] By adopting the above technical solution, the detection cylinder drives the detection structure to move up and down so that the camera module and infrared temperature module on the detection structure can detect the butt weld of the 304 stainless steel sheet and copper-tungsten contact, thereby improving the welding effect.

[0019] The present invention is further configured such that: the thin plate clamp assembly includes a clamp base plate adapted to the 304 stainless steel thin plate, a clamp connecting block is fixedly provided on one side of the clamp base plate, a clamp connecting groove is provided on the clamp connecting block, a clamp pressure plate is hingedly connected to the clamp connecting groove, a clamp pressure block is fixedly provided at one end of the clamp pressure plate, the lower surface of the clamp pressure block abuts against the upper surface of the 304 stainless steel thin plate, a clamp elastic bracket adapted to the clamp pressure plate is also provided in the clamp connecting block, and the other end of the clamp pressure plate protrudes outside the clamp connecting groove.

[0020] By adopting the above technical solution, the action state of the clamping pressure plate can be controlled, thereby facilitating the control of the working state of the thin plate clamping assembly.

[0021] The present invention is further configured such that: the clamp pressure plate is provided with an integral pressure plate connecting protrusion, the surface of the pressure plate connecting protrusion is rounded, the pressure plate connecting protrusion is hinged to the clamp connecting groove by a pressure plate pin, and the pressure plate pin is transversely inserted through the inner wall of the clamp connecting groove.

[0022] By adopting the above technical solution, the pressure plate connecting protrusion facilitates the hinged connection between the clamping pressure plate and the clamping block, and at the same time facilitates increasing the rotation angle of the clamping pressure plate, thereby facilitating the clamping of 304 stainless steel sheet.

[0023] The present invention is further configured such that: a micro motor is fixedly connected to the outside of the finger connecting block, a fine-tuning screw is fixedly connected to the rotating shaft of the micro motor, and the fine-tuning screw passes through the finger connecting block; a fine-tuning guide rod adapted to the ceramic side pressure head is also fixedly provided on the finger connecting block, and a guide rod groove adapted to the fine-tuning guide rod is provided on the ceramic side pressure head.

[0024] By adopting the above technical solution, the pressure sensor can be finely adjusted by a fine-tuning motor after detecting the pressure signal, thereby improving the effect of lateral pressing and thus improving the welding effect of 304 stainless steel sheet and copper-tungsten contact.

[0025] The present invention is further configured such that the device body also includes a compatible controller and a touch screen.

[0026] By adopting the above technical solution, the controller is used to receive signals detected by the detection component in order to coordinate the control of the device body, and the touch screen is used to display relevant control parameters and manual control command input.

[0027] On the other hand, the present invention provides the following technical solution: a welding method for 304 stainless steel sheet to copper-tungsten contacts, comprising the following steps: S1. Pre-treatment preparation: First, pre-treat the interface between the 304 stainless steel sheet and the copper-tungsten contact, and at the same time pre-treat the welding materials to facilitate rapid welding. S2. Positioning and Fixing: Positioning and fixing the 304 stainless steel sheet, copper-tungsten contacts, and welded precast sheets using the support base assembly, sheet clamp assembly, and contact side pressing assembly; S3. Inspection and Adjustment: The inspection component is used to check whether the part to be welded is in place. If it is not in place, the contact side pressure component is used to adjust it to meet the welding requirements. S4. Product Welding: The heating coil rapidly heats the welding part through high-frequency heating, enabling the 304 stainless steel sheet and copper-tungsten contacts to be welded quickly. S5. Product unloading: After welding is completed and the product has cooled down, unload the product.

[0028] The present invention is further configured such that: in S1, when the 304 stainless steel sheet is pre-treated, it is precision machined by a CNC machine tool, and when the copper-tungsten contact is pre-treated, it is cleaned or treated with other solderable coatings to improve the wettability of the brazing filler metal. The welding material is YM-Ag45CuZn silver-based brazing filler metal. At the same time, the welding material is pre-formed into a welding preform that matches the shape of the mating surface. The welding preform is set in a V-shaped structure and its thickness is set to 0.10-0.14mm. In S2, one side of the 304 stainless steel sheet is placed on the welding step of the ceramic base, and the other side is clamped and fixed by the sheet clamping assembly. Then, two copper-tungsten contacts to be welded are placed on the 304 stainless steel sheet at the welding step. Then, the parallel finger cylinder in the contact side pressing assembly drives the ceramic side pressing head to perform a pressing action. At the same time, when placing the two copper-tungsten contacts, the welding preform is placed in the middle. In S3, the detection cylinder in the detection component drives the detection structure to move downwards and get close to the welding part of the 304 stainless steel sheet and copper-tungsten contact. The camera module on the detection structure performs visual recognition of the welding part to determine whether it is in place. At the same time, the pressure sensor detects the pressure to determine whether it is in place. If it is not in place, the position can be adjusted again by the parallel finger cylinder in the contact side pressure component or by manual adjustment. In S4, after the heating coil starts heating, the welding preform is rapidly heated and melted into solder under the action of electromagnetic induction. The solidus temperature is about 660°C and the liquidus temperature is about 720°C. The molten solder continuously fills the capillary gap between the 304 stainless steel sheet and the copper-tungsten contact. The heating time of the heating coil is set to 6-10 seconds. During the welding process, the contact side pressure block applies pressure to the copper-tungsten contact and adjusts it according to the pressure detected by the pressure sensor. The applied pressure needs to change with the temperature and is maintained between 40-60N. In S5, during the cooling process, the lateral clamping pressure applied by the contact side pressure assembly remains unchanged until the solder has completely cooled and solidified, after which the product is removed for unloading.

[0029] In summary, the present invention has the following beneficial effects: 1. By cooperating with the support base assembly, contact side pressure assembly, heating assembly and detection assembly, the welding effect of the 304 stainless steel sheet and copper-tungsten contact welding parts is improved, while avoiding the problems of weld collapse and deformation. It can also improve the connection strength and reliability of the welding parts, and realize the standardization and semi-automation of the welding process, reduce human interference, and improve production efficiency and process consistency. 2. The 304 stainless steel sheet and the copper-tungsten contact tip abut against the inner side of the welding step, acting as a limiting guide. The base cylinder drives the ceramic base to move up and down, bringing the 304 stainless steel sheet closer to the welding area. The ceramic base provides rigid support for the 304 stainless steel sheet, with extremely high flatness, preventing deformation during welding. The parallel finger cylinder controls the movement and force of the pneumatic fingers to improve the welding effect. The side pressure groove is used to press the copper-tungsten contact tip to prevent it from shifting during welding and affecting the welding effect. The pressure sensor detects the pressing force, allowing the parallel finger cylinder to adjust it, thereby improving the welding effect. At the same time, the detection cylinder drives the detection structure to move up and down so that the camera module and infrared temperature module on the detection structure can detect the butt weld of the 304 stainless steel sheet and copper-tungsten contact tip, thereby improving the welding effect. Attached Figure Description

[0030] Figure 1 This is a perspective view of Embodiment 1 of the present invention.

[0031] Figure 2 These are two perspective views of Embodiment 1 of the present invention.

[0032] Figure 3 This is a front view of Embodiment 1 of the present invention.

[0033] Figure 4 for Figure 3 A cross-sectional view at point AA.

[0034] Figure 5 This is a top view of Embodiment 1 of the present invention.

[0035] Figure 6 This is a partial schematic diagram of Embodiment 1 with the heating component and detection component removed.

[0036] Figure 7 This is a top view of Embodiment 1 with the heating and detection components removed.

[0037] Figure 8 for Figure 7 A cross-sectional view of section BB.

[0038] Figure 9 This is a top view of Embodiment 2 of the present invention.

[0039] Figure 10 This is a structural block diagram of Embodiment 3 of the present invention.

[0040] Figure 11 This is a flowchart of the welding method of the present invention.

[0041] Reference numerals: 1. 304 stainless steel sheet; 2. Copper-tungsten contact; 3. Base cylinder; 31. Ceramic base; 311. Welding step; 32. Base limiting block; 4. Fixture base plate; 41. Fixture connecting block; 42. Fixture connecting groove; 43. Fixture pressure plate; 431. Fixture pressure block; 432. Pressure plate connecting protrusion; 433. Pressure plate pin; 44. Fixture elastic bracket; 5. Parallel finger cylinder; 51. Pneumatic finger; 52. Ceramic side pressure head; 521. Side pressure groove; 522. Pressure sensor; 523. Side pressure guide chamfer; 53. Finger connecting block; 54. Cylinder connecting block; 55. Micro motor; 551. Fine-tuning screw; 56. Fine-tuning guide rod; 6. Heating coil; 7. Detection bracket; 71. Detection cylinder; 72. Detection structure; 8. Controller; 9. Touch screen. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings.

[0043] Example 1: This example discloses a welding device for 304 stainless steel sheet and copper-tungsten contact, such as... Figures 1 to 8As shown, the device includes a main body, which has a support base assembly and a plate clamp assembly located on the left and right sides of a 304 stainless steel sheet 1. One side of the 304 stainless steel sheet 1 is connected to the upper part of the support base assembly, and two copper-tungsten contacts 2 are provided on the end of the 304 stainless steel sheet 1 on that side. The copper-tungsten contacts 2 can be placed on the part of the 304 stainless steel sheet 1 that needs to be connected by manual means or a robot. The other side of the 304 stainless steel sheet 1 is detachably connected to the plate clamp assembly. The support base assembly is also provided with a contact side pressing assembly that is compatible with the two copper-tungsten contacts 2. A heating assembly and a detection assembly that are compatible with the 304 stainless steel sheet 1 and the copper-tungsten contacts 2 are also provided above the support base assembly. The support base assembly and the plate clamp assembly fix the 304 stainless steel sheet 1, the contact side pressing assembly clamps and fixes the copper-tungsten contacts 2, and the heating assembly and the detection assembly heat and detect the welding part.

[0044] like Figure 6 and 8 As shown, the support base assembly includes a base cylinder 3 and a ceramic base 31 fixedly connected to the piston rod of the base cylinder 3. The ceramic base 31 has a welding step 311 adapted to the 304 stainless steel sheet 1 and the copper-tungsten contact 2. The ends of the 304 stainless steel sheet 1 and the copper-tungsten contact 2 abut against the inner side of the welding step 311, which serves as a limiting and guiding function. The ceramic base 31 is fitted with a base limiting block 32 fixedly connected to the upper part of the base cylinder 3. The base limiting block 32 has a limiting movable groove adapted to the ceramic base 31. The base cylinder 3 drives the ceramic base 31 to perform a lifting and lowering action, so as to move the 304 stainless steel on the ceramic base 31 closer to the welding area. The ceramic base 31 can provide rigid support for the 304 stainless steel sheet 1. Its flatness is extremely high, which can prevent deformation during welding.

[0045] like Figures 1 to 4As shown, the thin plate clamp assembly includes a clamp base plate 4 adapted to the 304 stainless steel thin plate 1. A clamp connecting block 41 is fixedly provided on one side of the clamp base plate 4. A clamp connecting groove 42 is provided on the clamp connecting block 41. A clamp pressure plate 43 is hingedly connected to the clamp connecting groove. A clamp pressure block 431 is fixedly provided at one end of the clamp pressure plate 43. The lower surface of the clamp pressure block 431 abuts against the upper surface of the 304 stainless steel thin plate 1. The clamp connecting block 41 is also provided with a clamp pressure plate 43 adapted to the clamp pressure plate 43. The clamping elastic bracket 44 is configured as a compression spring. The clamping elastic bracket 44 makes the clamping pressure block 431 tightly press against the surface of the 304 stainless steel sheet 1 to clamp and fix it. In order to facilitate the clamping or releasing action of the clamping pressure plate 43 on the 304 stainless steel sheet 1, the clamping pressure plate 43 at the end away from the 304 stainless steel sheet 1 is exposed outside the clamping connecting groove 42, which makes it easy for manual or robotic arm to control the action state of the clamping pressure plate, and thus facilitates the control of the working state of the sheet clamping assembly.

[0046] like Figure 4 As shown, the clamping plate 43 is provided with an integral clamping plate connecting protrusion 432. The surface of the clamping plate connecting protrusion 432 is rounded. The clamping plate connecting protrusion 432 is hinged to the clamping plate connecting groove 42 by a clamping plate pin 433. The clamping plate pin 433 is transversely inserted through the inner wall of the clamping plate connecting groove 42. The clamping plate connecting protrusion 432 facilitates the clamping plate 43 and the clamping block 431 to be hinged to each other, and at the same time facilitates the increase of the rotation angle of the clamping plate 43, thereby facilitating the clamping of the 304 stainless steel sheet 1.

[0047] like Figures 1 to 3 As shown in Figures 6 to 8, the contact side pressure assembly is equipped with a parallel finger cylinder 5 with two pneumatic fingers 51. The contact side pressure assembly also includes ceramic side pressure heads 52 located on the front and rear sides of the ceramic base 31. The pneumatic fingers 51 are fixedly connected to the ceramic side pressure heads 52 by setting a finger connecting block 53. The upper end of the parallel finger cylinder 5 is fixedly connected to the fixture base plate 4. During the welding process, the action and force of the pneumatic fingers 51 are controlled by the parallel finger cylinder 5 to improve the welding effect. The parallel finger cylinder 5 is connected to the support base assembly by setting a cylinder connecting block 54.

[0048] like Figure 6 and 8As shown, the ceramic side pressure head 52 has a side pressure groove 521 adapted to the copper-tungsten contact 2. The side pressure groove 521 is arranged in an inverted L-shape. The side pressure groove 521 also contains a high-temperature resistant pressure sensor 522. The side pressure groove 521 is used to press the copper-tungsten contact 2 to prevent its position from shifting during the welding process and affecting the welding effect. The side pressure groove 521 is also provided with a side pressure guide chamfer 523. The side pressure guide chamfer 523 facilitates the pressing of the copper-tungsten contact 2 onto the ceramic side pressure head 52. The pressure sensor 522 detects the pressing force so that the parallel finger cylinder 5 can be adjusted, thereby improving the welding effect.

[0049] like Figures 1 to 3 As shown, the heating assembly includes a heating coil 6 located directly above the ceramic base 31. During welding, the heating coil 6 is energized to generate electromagnetic induction, thereby welding the joint between the 304 stainless steel sheet 1 and the copper-tungsten contact 2.

[0050] like Figures 1 to 3 As shown, the detection assembly includes a detection bracket 7 and a detection cylinder 71 fixed on the detection bracket 7. The detection cylinder 71 is inverted and a detection structure 72 connected to its piston rod is provided at the lower end of the detection cylinder 71. A camera module and an infrared temperature module adapted to the detection structure 72 are provided at the lower end of the detection structure 72. The detection cylinder 71 drives the detection structure 72 to move up and down so that the camera module and infrared temperature module on the detection structure 72 can detect the butt weld of the 304 stainless steel sheet 1 and the copper-tungsten contact 2, thereby improving the welding effect.

[0051] Example 2, as Figure 9 As shown, this embodiment is based on embodiment one, as follows: Figure X As shown in Figure XXX, a micro motor 55 is fixedly connected to the outer side of the finger connecting block 53. A fine-tuning screw 551 is fixedly connected to the rotating shaft of the micro motor 55, and the fine-tuning screw 551 passes through the finger connecting block 53. The ceramic side pressure head 52 is threadedly connected to the fine-tuning screw 551 through a fine-tuning screw hole. A fine-tuning guide rod 56 adapted to the ceramic side pressure head 52 is also fixed on the finger connecting block 53. A guide rod groove adapted to the fine-tuning guide rod 56 is opened on the ceramic side pressure head 52. After the pressure sensor 522 detects the pressure signal, it can be finely adjusted by the fine-tuning motor, thereby improving the effect of lateral pressing and thus improving the welding effect between the 304 stainless steel sheet 1 and the copper-tungsten contact 2.

[0052] Example 3, as Figure 10As shown, this embodiment also includes a controller 8 and a touch screen 9. The controller 8 works in conjunction with the support base assembly, the contact side pressure assembly, the heating assembly, and the detection assembly. The controller 8 is used to receive signals detected by the detection assembly in order to coordinate the control of the device body. The touch screen 9 is used for inputting, storing, and recalling process parameters (pressure curve, heating curve), as well as real-time monitoring of the welding process (pressure and temperature simulation values).

[0053] On the other hand, a welding method is used to bond 304 stainless steel sheet to copper-tungsten contacts, such as... Figure 11 As shown, it includes the following steps: S1. Pre-treatment preparation: First, pre-treat the interface between the 304 stainless steel sheet 1 and the copper-tungsten contact 2, and at the same time pre-treat the welding materials to facilitate rapid welding. S2. Positioning and fixing: Position and fix the 304 stainless steel sheet 1, copper-tungsten contact 2, and welded precast sheet using the support base assembly, sheet clamp assembly, and contact side pressing assembly. S3. Inspection and Adjustment: The inspection component is used to check whether the part to be welded is in place. If it is not in place, the contact side pressure component is used to adjust it to meet the welding requirements. S4. Product welding: The heating coil 6 heats the welding part quickly by high-frequency heating, so that the 304 stainless steel sheet 1 and the copper-tungsten contact 2 can be welded quickly. S5. Product unloading: After welding is completed and the product has cooled down, unload the product.

[0054] In the S1 section, the 304 stainless steel sheet 1 is pre-treated by precision machining using a CNC machine tool to ensure the flatness and perpendicularity of the welding surface, thereby improving the welding effect of the 304 stainless steel sheet 1. Meanwhile, the copper-tungsten contact 2 is pre-treated by cleaning or other solderable coatings to improve the wettability of the brazing filler metal, thus enhancing the welding effect of the copper-tungsten contact 2. YM-Ag45CuZn silver-based brazing filler metal is used. Simultaneously, the welding material is pre-formed into a welding preform that matches the shape of the mating surface. The welding preform has a V-shaped structure, and its thickness is determined based on the height of the gap between the copper-tungsten contact 2 and the 304 stainless steel part, with a selectable thickness range of 0.10-0.14 mm.

[0055] In S2, one side of the welding surface of the 304 stainless steel sheet 1 is placed on the welding step 311 of the ceramic base 31, and the other side is clamped and fixed by the sheet clamp assembly. Then, two copper-tungsten contacts 2 to be welded are placed on the 304 stainless steel sheet 1 at the welding step 311. The surfaces of the 304 stainless steel sheet 1 and the copper-tungsten contacts 2, which have been pretreated in S1, abut against each other. Then, the parallel finger cylinder 5 in the contact side pressing assembly drives the ceramic side pressing head 52 to perform a pressing action, thereby achieving the effect of lateral pressing of the copper-tungsten contacts 2. At the same time, when placing the two copper-tungsten contacts 2, the welding preform is placed in the middle.

[0056] Pressing the clamp plate 43 can cause the clamp block 431 to lift up, thereby picking up and placing the 304 stainless steel sheet 1. Releasing the clamp plate 43 will cause the clamp block 431 to press the 304 stainless steel sheet 1 tightly under the action of the clamp elastic bracket 44.

[0057] In S3, the detection cylinder 71 in the detection assembly drives the detection structure 72 to move downwards and approach the welding area between the 304 stainless steel sheet 1 and the copper-tungsten contact 2. The camera module on the detection structure 72 performs visual recognition of the welding area to determine whether it is in place. At the same time, the pressure sensor 522 detects the pressure to determine whether it is in place. If it is not in place, the position can be adjusted again by the parallel finger cylinder 5 in the contact side pressure assembly or by manual adjustment to achieve the welding standard. This ensures that the welding preform is in a uniform and stable micro-compression state before welding begins. This step is the key to actively eliminating gap differences and preventing collapse.

[0058] In S4, after the heating coil 6 starts heating, the welding preform is rapidly heated and melted into solder under the action of electromagnetic induction. The solidus temperature is about 660°C and the liquidus temperature is about 720°C. The melted solder continuously fills the capillary gap between the 304 stainless steel sheet 1 and the copper-tungsten contact 2. The heating time of the heating coil 6 is set to 6-10 seconds.

[0059] Simultaneously, during the welding process, the contact side pressure block applies pressure to the copper-tungsten contact 2 and adjusts it according to the pressure detected by the pressure sensor 522. The applied pressure needs to change with the temperature so that the liquid solder can fully fill the capillary gap and squeeze out any possible impurities or bubbles. The dynamic pressure makes the weld more dense and defect-free. The applied pressure is maintained between 40-60N.

[0060] In S5, during the cooling process, the lateral clamping pressure applied by the contact side pressure assembly remains unchanged until the solder has completely cooled and solidified, after which the product is removed for unloading.

[0061] In summary, the present invention has the following beneficial effects: 1. By cooperating with the support base assembly, contact side pressure assembly, heating assembly and detection assembly, the welding effect of the welding part of the 304 stainless steel sheet 1 and copper tungsten contact 2 is improved. At the same time, the problems of weld collapse and deformation at the welding part are avoided. It can also improve the connection strength and reliability at the welding part. It also realizes standardization and semi-automation in the welding process, reduces human interference, and improves production efficiency and process consistency. 2. The 304 stainless steel sheet 1 and the copper-tungsten contact 2 abut against the inner side of the welding step 311, serving as a limiting and guiding function. The base cylinder 3 drives the ceramic base 31 to move up and down, so that the 304 stainless steel on the ceramic base 31 can move closer to the welding area. The ceramic base 31 provides rigid support for the 304 stainless steel sheet 1, and its flatness is extremely high, which can prevent deformation during welding. The parallel finger cylinder 5 controls the movement and force of the pneumatic finger 51 to improve the welding effect. The side pressure groove 521 is used to press the copper-tungsten contact 2 to prevent its position from shifting during welding and affecting the welding effect. The pressure sensor 522 detects the pressing force so that the parallel finger cylinder 5 can be adjusted, thereby improving the welding effect. At the same time, the detection cylinder 71 drives the detection structure 72 to move up and down so that the camera module and infrared temperature module on the detection structure 72 can detect the butt welding part of the 304 stainless steel sheet 1 and the copper-tungsten contact 2, thereby improving the welding effect.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for 304 stainless steel sheet and copper-tungsten contacts, comprising a device body, characterized in that, The device body is provided with a support base assembly and a thin plate clamp assembly adapted to the 304 stainless steel thin plate (1). One side of the 304 stainless steel thin plate (1) is connected to the upper part of the support base assembly and has two copper tungsten contacts (2) placed on it. The other side is detachably connected to the thin plate clamp assembly. The support base assembly is provided with a contact side pressing assembly adapted to the two copper tungsten contacts (2). A heating assembly and a detection assembly are also provided above the support base assembly. The heating assembly is provided with a heating coil (6) located directly above the ceramic base (31).

2. The welding device for 304 stainless steel sheet (1) and copper-tungsten contact (2) according to claim 1, characterized in that, The support base assembly includes a base cylinder (3) and a ceramic base (31) fixedly connected to the piston rod of the base cylinder (3). The ceramic base (31) has a welding step (311) adapted to the 304 stainless steel sheet (1) and copper-tungsten contact (2). The ends of the 304 stainless steel sheet (1) and copper-tungsten contact (2) abut against the inner side of the welding step (311). The ceramic base (31) is fitted with a base limiting block (32) fixedly connected to the upper part of the base cylinder (3). The base limiting block (32) has a limiting groove adapted to the ceramic base (31).

3. The welding device for 304 stainless steel sheet and copper-tungsten contact according to claim 2, characterized in that, The contact side pressure assembly is equipped with a parallel finger cylinder (5) with two pneumatic fingers (51). The contact side pressure assembly also includes ceramic side pressure heads (52) located on the front and rear sides of the ceramic base (31). The pneumatic fingers (51) are fixedly connected to the ceramic side pressure heads (52) by setting a finger connecting block (53). The upper end of the parallel finger cylinder (5) is fixedly connected to the clamp base plate (4). The parallel finger cylinder (5) is connected to the support base assembly by setting a cylinder connecting block (54). The ceramic side pressure head (52) is provided with a side pressure groove (521) adapted to the copper-tungsten contact (2). The side pressure groove (521) is arranged in an inverted L-shaped structure. There is also a high-temperature resistant pressure sensor (522) in the side pressure groove (521). The side pressure groove (521) is also provided with a side pressure guide chamfer (523).

4. The welding device for 304 stainless steel sheet and copper-tungsten contact according to claim 1, characterized in that, The detection assembly includes a detection bracket (7) and a detection cylinder (71) fixed on the detection bracket (7). The detection cylinder (71) is inverted and a detection structure (72) connected to its piston rod is provided at the lower end of the detection cylinder (71). A camera module and an infrared temperature module adapted to the detection structure (72) are provided at the lower end of the detection structure (72).

5. The welding device for 304 stainless steel sheet and copper-tungsten contact according to claim 1, characterized in that, The thin plate clamp assembly includes a clamp base plate (4) adapted to the 304 stainless steel thin plate (1). A clamp connecting block (41) is fixed on one side of the clamp base plate (4). A clamp connecting groove (42) is opened on the clamp connecting block (41). A clamp pressure plate (43) is hinged to the clamp connecting groove. A clamp pressure block (431) is fixed at one end of the clamp pressure plate (43). The lower surface of the clamp pressure block (431) abuts against the upper surface of the 304 stainless steel thin plate (1). A clamp elastic bracket (44) adapted to the clamp pressure plate (43) is also provided in the clamp connecting block (41). The other end of the clamp pressure plate (43) is exposed outside the clamp connecting groove (42).

6. The welding device for 304 stainless steel sheet and copper-tungsten contact according to claim 5, characterized in that, The clamping plate (43) is provided with an integral clamping plate connecting protrusion (432). The surface of the clamping plate connecting protrusion (432) is rounded. The clamping plate connecting protrusion (432) is hinged to the clamping plate connecting groove (42) by setting a clamping plate pin (433). The clamping plate pin (433) is transversely inserted through the inner wall of the clamping plate connecting groove (42).

7. The welding device for 304 stainless steel sheet and copper-tungsten contact according to claim 3, characterized in that, A micro motor (55) is fixedly connected to the outside of the finger connecting block (53). A fine-tuning screw (551) is fixedly connected to the rotating shaft of the micro motor (55), and the fine-tuning screw (551) passes through the finger connecting block (53). A fine-tuning guide rod (56) adapted to the ceramic side pressure head (52) is also fixedly provided on the finger connecting block (53). A guide rod groove adapted to the fine-tuning guide rod (56) is opened on the ceramic side pressure head (52).

8. The welding device for 304 stainless steel sheet and copper-tungsten contact according to claim 1, characterized in that, The device body also includes a compatible controller (8) and a touch screen (9).

9. A welding method for 304 stainless steel sheet to copper-tungsten contacts, characterized in that, The steps include the following: S1. Pre-treatment preparation: First, pre-treat the interface between the 304 stainless steel sheet (1) and the copper-tungsten contact (2) respectively, and at the same time pre-treat the welding materials so as to continue welding quickly. S2. Positioning and fixing: Positioning and fixing the 304 stainless steel sheet (1), copper-tungsten contact (2), and welded preform through the support base assembly, sheet clamp assembly and contact side pressing assembly; S3. Inspection and Adjustment: The inspection component is used to check whether the part to be welded is in place. If it is not in place, the contact side pressure component is used to adjust it to meet the welding requirements. S4. Product welding: The heating coil (6) heats the welding part quickly by high frequency heating, so that the 304 stainless steel sheet (1) and the copper tungsten contact (2) can be welded quickly. S5. Product unloading: After welding is completed and the product has cooled down, unload the product.

10. A welding method for 304 stainless steel sheet and copper-tungsten contact according to claim 9, characterized in that, In S1, the 304 stainless steel sheet (1) is pre-treated by precision machining using a CNC machine tool, while the copper-tungsten contact (2) is pre-treated by cleaning or other solderable coating treatment to improve the wettability of the brazing filler metal. The welding material is YM-Ag45CuZn silver-based brazing filler metal. At the same time, the welding material is pre-made into a welding preform that matches the shape of the mating surface. The welding preform is set in a V-shaped structure and its thickness is set to 0.10-0.14mm. In S2, one side of the welding surface of the 304 stainless steel sheet (1) is placed on the welding step (311) of the ceramic base (31), and the other side is clamped and fixed by the sheet clamp assembly. Then, two copper-tungsten contacts (2) to be welded are placed on the 304 stainless steel sheet (1) at the welding step (311). Then, the parallel finger cylinder (5) in the contact side pressure assembly drives the ceramic side pressure head (52) to perform the pressing action. At the same time, when placing the two copper-tungsten contacts (2), the welding preform is placed in the middle. In S3, the detection cylinder (71) in the detection assembly drives the detection structure (72) to move downwards and get close to the welding part of the 304 stainless steel sheet (1) and the copper-tungsten contact (2). The camera module on the detection structure (72) performs visual recognition on the welding part to determine whether it is in place. At the same time, it combines the pressure sensor (522) to detect the pressure and determine whether it is in place. If it is not in place, the position can be adjusted again by the parallel finger cylinder (5) in the contact side pressure assembly or by manual adjustment. In S4, after the heating coil (6) starts heating, the welding preform is rapidly heated and melted into solder under the action of electromagnetic induction. The solid phase line is about 660°C and the liquid phase line is about 720°C. The melted solder continuously fills the capillary gap between the 304 stainless steel sheet (1) and the copper-tungsten contact (2). The heating time of the heating coil (6) is set to 6-10s. During the welding process, the contact side pressure block applies pressure to the copper-tungsten contact (2) and adjusts it according to the pressure detected by the pressure sensor (522). The applied pressure needs to be changed with the temperature and the applied pressure is kept between 40-60N. In S5, during the cooling process, the lateral clamping pressure applied by the contact side pressure assembly remains unchanged until the solder has completely cooled and solidified, after which the product is removed for unloading.

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