A welding fixture
By designing the base plate and raised component structure of the welding fixture, the problem of poor gas flow during welding was solved, which improved welding quality and yield, reduced production costs, and achieved stability and reliability in the welding process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING SOKON POWER CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-07-24
AI Technical Summary
Existing welding fixtures cannot maintain structural stability in high-temperature formic acid environments, affecting welding quality. Furthermore, poor gas flow leads to insufficient welding reliability, becoming a bottleneck restricting the improvement of production costs and yield rates for power electronic systems in new energy vehicles.
A welding fixture is designed, including a substrate and a set of welding stations spaced apart. A limiting part is provided between the welding stations, and detachable first and second shims are provided. The shims are provided with clearance and through holes to ensure gas flow, and are positioned and limited by the upper pressure plate combined with the substrate.
It improved welding quality, increased the yield rate of welded products, reduced production costs, solved the problem of poor gas flow, and ensured the stability and reliability of the welding process.
Smart Images
Figure CN224543525U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of reflow soldering technology, specifically to a welding fixture. Background Technology
[0002] In the power electronics systems of new energy vehicles, the Tesla Package has become the core packaging form for electric drive modules due to its high power density and excellent heat dissipation performance. With the large-scale application of silicon carbide (SiC) power devices, traditional lead-free reflow soldering processes face the problem of insufficient high-temperature soldering reliability. Formic acid reflow soldering, on the other hand, achieves oxygen-free soldering in a reducing atmosphere, which can effectively eliminate solder oxidation and reduce void ratio, making it particularly suitable for high-temperature interconnection between large-area DBC substrates and heat dissipation substrates in TPAK packages. However, this process places stringent requirements on tooling fixtures, requiring structural stability to be maintained in a high-temperature formic acid environment, while precisely controlling the soldering pressure to balance the requirements of airtightness and the risk of chip stress. Existing soldering fixtures have the problem of hindering the flow of formic acid gas, which affects the soldering quality, becoming a key bottleneck restricting the improvement of process yield and the reduction of production costs. Utility Model Content This application provides a welding fixture that improves welding quality and increases production yield by modifying the structure of related components.
[0003] This application provides a welding fixture, including a substrate and at least two sets of welding stations arranged at intervals on the substrate. Each welding station set includes a plurality of welding stations arranged at intervals, and the welding stations are used to connect the workpieces to be welded. A limiting part is provided between the welding station sets. An interval area is provided between two adjacent welding stations in the same welding station set. The welding fixture also includes: A first shim, which is detachably installed in the limiting portion; and The second shim is detachably disposed on both sides of the substrate. The second shim has multiple recessed notches, which engage with a corresponding soldering station, and a second clearance is formed between the second shim and the soldering station.
[0004] In the above scheme, the substrate is provided with multiple protruding welding stations for placing the workpiece to be welded and welding it to the workpiece. The second shim is provided with a recessed second clearance between the second shim and the welding station, so that the reflow shielding gas and reducing gas can flow fully and contact the welding area of the welding station and the workpiece to be welded. This solves the problem that the welding quality is affected by the poor flow of shielding gas and reducing gas on the upper and lower sides of the substrate. Moreover, the substrate serves as another workpiece to be welded and also has the positioning function of the welding fixture, making full use of the structural characteristics of the substrate and simplifying the structure of the welding fixture.
[0005] In one embodiment, the first shim is provided with a plurality of first clearance positions on both sides, and the first clearance positions are provided corresponding to the interval area.
[0006] In the above solution, in order to further solve the problem of welding quality being affected by poor flow of protective gas and reducing gas, multiple first clearance positions are provided on both sides of the first shim, and the first shim is set in the limiting part in the middle area of the substrate, so that the reflow protective gas and reducing gas can flow fully and contact the welding area in the middle of the substrate, thereby solving the problem of welding quality being affected by poor flow of protective gas and reducing gas in the middle area of the substrate.
[0007] In one embodiment, the welding fixture includes a plurality of first shims spliced together, each first shim also having through stress holes, the plurality of stress holes being arranged at intervals.
[0008] In the above solution, the splicing of the first shim can reduce the thermal deformation problem caused by the large size of the first shim. In addition, the first shim has multiple through stress holes, which can solve the problem of stress deformation caused by heat. The multiple stress holes can not only disperse stress but also increase the heat dissipation area and improve heat dissipation efficiency.
[0009] In one embodiment, the welding fixture further includes a plurality of second shims spaced apart, and each of two adjacent second shims in the same welding station group has a locking angle on one side, and the locking angle is respectively locked onto one side of a welding station.
[0010] In the above scheme, multiple second shims are spaced apart, which can reduce the thermal deformation problem caused by the large size of the second shims. At the same time, the two sides of the second shims are provided with corner clips. This design can form a gap between the splice of two adjacent second shims, which can effectively reduce the size of the second shims, improve the utilization rate of the second shims, and reduce the cost of welding fixtures.
[0011] In one embodiment, the distance between the bottom surface of the second clearance and the side of the welding station is greater than half the distance by which the side of the welding station is inserted into the notch, and the width of the second clearance is greater than half the width of the notch.
[0012] In the above scheme, the depth of the second clearance position is greater than the depth of half the notch, and the width of the second clearance position is greater than the width of half the notch. This design is to fully expand the volume of the second clearance position so that the protective gas and reducing gas can flow and contact the area to be welded, thereby improving the welding quality.
[0013] In one embodiment, the protrusion thickness of the welding station is greater than the thickness of the first shim and the thickness of the second shim.
[0014] In the above scheme, the thickness of the soldering station is greater than the thickness of the first and second shims because the substrate needs to be fitted with an insulating sheet before soldering. When the first and second shims are placed on the substrate with the insulating sheet, the thickness of the soldering station is greater than that of the substrate. This height difference can effectively limit the sheet solder and is conducive to the stability of the soldering process.
[0015] In one embodiment, the first shim has a first handhold on one side, and the first handhold protrudes from both sides of the substrate.
[0016] In the above scheme, the first hand position protruding from both sides of the substrate facilitates the removal of the hot first shim from the substrate after welding, thereby improving operational safety and convenience.
[0017] In one embodiment, the welding fixture further includes an upper pressure plate located on the substrate, the upper pressure plate having a plurality of spaced and through grids; The upper pressure plate is placed on the substrate, and the two welding stations are located within the projection range of one of the grids. The workpiece to be welded is placed inside the grid and welded to the welding station.
[0018] In the above solution, the combination of the upper pressure plate and the substrate allows the parts to be welded on the substrate to be effectively placed. The upper pressure plate is provided with multiple spaced and through grids that can accommodate the parts to be welded respectively, and can also limit the parts to be welded in the vertical and horizontal directions. Moreover, after welding is completed, the upper pressure plate is relatively easy to remove, which improves the convenience of the welding process.
[0019] In one embodiment, the upper pressure plate is further provided with support platforms, which are located at the four corners of the upper pressure plate and protrude to form steps, and the four support platforms support the upper pressure plate on the substrate.
[0020] In the above scheme, the support platform can limit the bonding distance between the upper pressure plate and the substrate. This structure is simple and helps to reduce processing costs.
[0021] In one embodiment, the soldering station is provided with solder, the workpiece to be soldered is placed on the solder, and the workpiece to be soldered is connected to the substrate through the solder.
[0022] In the above solution, the welding station can hold solder for welding. This process is mature and stable. Combined with the application of the first and second shims, the welding yield can be improved and the production cost can be reduced.
[0023] The beneficial effects of adopting the above technical solution are: This application provides a welding fixture, including a substrate, at least two sets of welding stations disposed on the substrate and spaced apart, and a second shim that engages with the welding station sets. Each welding station set includes multiple spaced welding stations. The second shim has multiple recessed notches, each notch engaging with a corresponding welding station. A second recessed clearance is also formed between the second shim and the welding station. This second clearance facilitates the sufficient flow and contact of the reflow shielding gas and reducing gas with the welding area of the welding station and the workpiece, thus solving the problem of poor flow of shielding and reducing gases on the upper and lower sides of the substrate affecting welding quality. This improves welding yield and reduces production costs. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the welding fixture provided in this embodiment.
[0026] Figure 2 This is a schematic diagram of the exploded structure of the welding fixture provided in this embodiment.
[0027] Figure 3 This is a structural schematic diagram of the second shim provided in this embodiment.
[0028] Figure 4 for Figure 1 A schematic diagram of the AA-direction cross-section structure.
[0029] Figure 5 for Figure 4 A magnified structural diagram of point C.
[0030] Figure 6 for Figure 1 A magnified structural diagram of the portion BB.
[0031] Figure 7 for Figure 6 A magnified structural diagram of point D.
[0032] Figure label: 100 - Welding fixture; 10-Substrate; 11-Soldering station group; 111 - Soldering station; 12-Limiting part; 13-Interval zone; 14 - First positioning hole; 20 - First shim; 21-First clearing position; 22-Stress hole; 23 - First hand position; 30 - Second shim; 31-gap; 32 - Second evasive position; 33-Corner; 34-Second Elevating Piece A; 35-Second shim, part B; 36 - Second hand position; 40 - Upper pressure plate; 41-Grate; 42-Support platform; 43 - Second positioning hole; 44-Blocking part. Detailed Implementation
[0033] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0034] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.
[0035] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0036] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0037] To address the issues of thermal deformation and welding quality in welding fixtures, this application provides a welding fixture 100. Figure 1 This is a schematic diagram of the welding fixture provided in this embodiment. Figure 2 This is a schematic diagram of the exploded structure of the welding fixture provided in this embodiment. Figure 3 This is a structural schematic diagram of the second shim provided in this embodiment, as shown below. Figure 1, Figure 2 and Figure 3 As shown, the welding fixture 100 includes a base plate 10 and at least two sets of welding stations 11 disposed on the base plate 10 and spaced apart. Each welding station 11 includes a plurality of welding stations 111 spaced apart. Each welding station 111 is used to connect the workpiece to be welded. A limiting part 12 is provided between the welding station 11s. An interval area 13 is provided between two adjacent welding stations 111 in the same welding station 11.
[0038] The welding fixture 100 also includes: The first elevating member 20 is detachably installed in the limiting part 12. The second shim 30 is detachably disposed on both sides of the substrate 10. The second shim 30 has a plurality of recessed notches 31, which are engaged with a corresponding soldering station 111, and a second clearance 32 is formed between the second shim 30 and the soldering station 111.
[0039] This application provides a welding fixture 100, including a substrate 10, at least two sets of welding station groups 11 disposed on the substrate 10 and spaced apart, and a plurality of second elevating members 30 that engage with the welding station groups 11. The welding station groups 11 include a plurality of spaced welding stations 111. The second elevating members 30 are provided with a plurality of recessed notches 31, each notch 31 engaging with a corresponding welding station 111. A recessed second clearance 32 is also formed between the second elevating member 30 and the welding station 111. The second clearance 32 facilitates the sufficient flow and contact of the reflow shielding gas and reducing gas with the welding station 111 and the welding area of the workpiece to be welded, thereby solving the problem of poor flow of shielding gas and reducing gas on the upper and lower sides of the substrate 10, which affects the welding quality, improves the welding yield, and reduces production costs.
[0040] To make the technical solution, purpose and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.
[0041] In some implementations, please refer to [the relevant documentation]. Figure 1 and Figure 2 In order to fully optimize the structure of the welding fixture 100 and make full use of the structure of the related components of the welding fixture 100 for effective positioning, the welding fixture 100 of this application includes a base plate 10 and at least two sets of welding stations 11 disposed on the base plate 10 and spaced apart. Moreover, a limiting part 12 is provided between the welding station sets 11. The welding station set 11 includes a plurality of welding stations 111 spaced apart. An interval area 13 is provided between two adjacent welding stations 111 in the same welding station set 11.
[0042] Specifically, the substrate 10 has a square plate structure. Two rows of parallel and spaced-apart soldering stations 11 protrude from the upper surface of the substrate 10. A limiting portion 12 extending in a groove structure along the length direction is formed between the two rows of soldering station groups 11. Each row of soldering station groups 11 has multiple soldering stations 111 spaced-apart along the length direction. A gap area 13 extending in a groove structure along the height direction is formed between every two soldering stations 111 in the same soldering station group 11. The multiple soldering stations 111 of the two rows of soldering station groups 11 are correspondingly disposed on the surface of the substrate 10. An installation area is provided on the side of the substrate 10, away from the side of the soldering station group 11, to facilitate the installation of other functional components. Four first positioning holes 14 are also provided at the four corners of the substrate 10 for positioning and installation.
[0043] The welding station 111 is used to connect the workpiece to be welded. That is, the welding material is placed on the surface of the welding station 111 and then the workpiece to be welded is placed on it. The gap area 13 between the two welding stations 111 can facilitate the flow of the welding shielding gas and reducing gas and ensure full contact with the welding area, so as to improve the welding quality between the welding station 111 and the workpiece to be welded.
[0044] In some implementations, such as Figure 1 and Figure 2 As shown, in order to support and position the workpiece to be welded in the middle of the substrate 10, the welding fixture 100 also includes a first shim 20. The first shim 20 is detachably installed in the limiting part 12. In order to avoid the two sides of the first shim 20 from obstructing the flow of welding shielding gas and reducing gas, a plurality of first clearance positions 21 are provided on the two sides of the first shim 20. The first clearance positions 21 are correspondingly provided with the interval area 13.
[0045] Specifically, the first shim 20 is a long strip of metal plate. The two sides of the first shim 20 in the length direction are provided with a plurality of spaced square openings 21. The plurality of first openings 21 form a structure similar to the crenellations of a city wall. When the first shim 20 is placed in the limiting part 12, each first opening 21 is aligned with a gap 13, so that the gap 13 between each two welding stations 111 in the length direction will not become narrower due to the first shim 20. That is, the combination of the gap 13 and the first opening 21 can enable the shielding gas and reducing gas to flow and contact the welding area during the welding process.
[0046] In some implementations, please refer to [the relevant documentation]. Figure 1 and Figure 2To prevent excessive deformation due to heat, the welding fixture includes multiple spliced first shims 20. Each first shim 20 is also provided with through stress holes 22. The multiple stress holes 22 are arranged at intervals. In order to reduce the length of the first shims 20 and facilitate the removal and placement of the first shims 20 from the substrate 10, a first handhold position 23 is provided on one side of the first shims 20. Two first shims 20 are placed opposite each other in the limiting part 12, and the first handhold position 23 protrudes from both sides of the substrate 10.
[0047] Specifically, the surface of the first shim 20 is provided with a plurality of spaced and through stress holes 22. The plurality of stress holes 22 can increase the heat dissipation area and also disperse the internal stress generated by the thermal deformation of the first shim 20, so that the first shim 20 does not deform too much and affect its use. At the same time, in order to further reduce the thermal deformation of the first shim 20, the length of the first shim 20 is shortened. Multiple first shims 20 can be placed together in the limiting part 12. In this embodiment, two first shims 20 are placed together in the limiting part 12. Moreover, the length of the two first shims 20 after docking is greater than the length of the limiting part 12. It can be understood that the two ends of the two first shims 20 are exposed at both ends of the length direction of the substrate 10. The part of the first shim 20 exposed at both ends of the substrate 10 is the first hand position 23, which is used to place and remove the first shim 20 from the substrate 10.
[0048] In some implementations, such as Figures 1-3 As shown, in order to provide sufficient support for the position of the workpiece to be welded on the upper and lower sides of the substrate 10 and to position the solder, the welding fixture also includes a plurality of second shims 30 spaced apart. The plurality of second shims 30 are detachably disposed on both sides of the substrate 10, and the second shims 30 are provided with a plurality of recessed notches 31. The notches 31 are engaged with a corresponding welding station 111, and a second clearance 32 is formed between the second shims 30 and the welding station 111.
[0049] Specifically, the second shim 30 is a rectangular thin metal sheet structure. Along one side of the second shim 30, at least two spaced and recessed square notches 31 are provided. Each notch 31 engages with the side of a welding station 111 in a welding station group 11 on the substrate 10. Furthermore, a second clearance 32 is formed from the recess of each notch 31. That is, the engagement area between the notch 31 of the second shim 30 and the side of the welding station 111 is the two corners of the notch 31. The second clearance 32 facilitates the sufficient flow and contact of shielding gas and reducing gas with the welding area during the welding process. Exemplarily, the number of notches 31 can be 1, 2, 3, 4, 5, or other numbers, and is not limited here.
[0050] In some implementations... Figure 4 for Figure 1 Schematic diagram of the AA-direction cross-section structure. Figure 5 for Figure 4 A magnified structural diagram of point C, as shown below. Figures 1-5 As shown, in order to position the solder, the protrusion thickness of the soldering station 111 is greater than the thickness of the first shim 20 and the thickness of the second shim 30.
[0051] Specifically, before welding the workpiece, insulating sheets (not shown) need to be attached to the top, bottom and middle of the substrate 10. When the first shim 20 and the second shim 30 are placed on the substrate 10 with the insulating sheets (not shown), they can be higher than the thickness of the soldering station 111. This height difference can effectively limit the sheet solder and is conducive to the stability of the welding process.
[0052] To ensure that the welding shielding gas and reducing gas can flow and contact the welding area sufficiently, such as Figure 2 and Figure 3 As shown, the distance between the bottom surface of the second clearance position 32 and the side of the welding station 111 is greater than half the distance by which the side of the welding station 111 is inserted into the notch 31, and the width of the second clearance position 32 is greater than half the width of the notch 31, that is, the C2 value is greater than half the C1 value, and the D2 value is greater than half the D1 value.
[0053] In some implementations, please refer to [the relevant documentation]. Figures 1-3 In order to improve the utilization rate of the second shim 30, each of the two adjacent second shims 30 in the same welding station group 11 is provided with a locking angle 33 on one side, and the locking angle 33 is respectively locked to one side of a welding station 111.
[0054] Specifically, in the actual application of this application, each row of welding stations 11 uses four spaced second shims 30, and there is still a welding station 111 between every two adjacent second shims 30. In order to make the welding station 111 between two adjacent second shims 30 have the same locking conditions as other welding stations 111, at least one side of the second shim 30 in the length direction is provided with a right-angled locking angle 33 so that the locking angles 33 of the two sides of the two adjacent second shims 30 can lock onto the two sides of the welding station 111. Moreover, the spacing width between the adjacent sides of the two adjacent second shims 30 is not less than the width of the spacing area 13 between other adjacent welding stations 111, so that the welding station 111 can have the same or similar welding conditions as other welding stations 111, that is, the shielding gas and reducing gas can flow and contact the welding area during the welding process.
[0055] In some implementations, such as Figure 1 and Figure 2 As shown, in order to ensure that the distance between the second shims 30, which are mounted on the upper and lower sides of the soldering station assembly 11 on the substrate 10, and the upper and lower sides of the substrate 10 are consistent, the second shims 30 includes a second shim 34 and a second shim 35. The second shim 34 and the second shim 35 are symmetrical in structure and are paired and mounted on the sides of multiple soldering stations 111 in the soldering station assembly 11 on the upper and lower sides of the substrate 10. Furthermore, the second shim 34 can accommodate the second shim 35.
[0056] For ease of placement, the second shim A 34 and the second shim B 35 are provided with protruding second hand positions 36 on their sides, which also facilitates the removal of the heated second shim A 34 and the second shim B 35 from the substrate 10.
[0057] In some implementations, please refer to [the relevant documentation]. Figure 1 , Figure 2 and Figure 5 In order to provide sufficient positioning for the workpiece to be welded, the welding fixture 100 also includes an upper pressure plate 40 located on the substrate 10. The upper pressure plate 40 is provided with a plurality of spaced and through grids 41, and the upper pressure plate 40 covers the substrate 10. Two welding stations 111 are located within the projection range of one grid 41. The workpiece to be welded is placed in the grid 41, and the workpiece to be welded is welded to the welding station 111.
[0058] Specifically, the upper pressure plate 40 is a square metal plate structure, and multiple through grilles 41 are arranged side by side along the length of the upper pressure plate 40. Each grille 41 contains two welding stations 111 arranged vertically and separated by the first raising member 20. That is, multiple grilles 41 are perpendicular to the first raising member 20, and the workpiece to be welded can be placed on the two welding stations 111 in the grille 41. Thus, the grille 41 can limit the length and height of the workpiece to be welded, preventing the workpiece to be welded from moving during the welding process and causing misalignment or other welding problems.
[0059] In some embodiments, the upper pressure plate 40 is further provided with a support platform 42, which is located at the four corners of the upper pressure plate 40 and protrudes to form a step. The four support platforms 42 support the upper pressure plate 40 on the substrate 10. In addition, for the connection between the upper pressure plate 40 and the substrate 10, the four corners of the upper pressure plate 40 are also provided with a second positioning hole 43.
[0060] Specifically, the upper pressure plate 40 has four second positioning holes 43 at its four corners. The diameter and spacing of the four second positioning holes 43 on the upper pressure plate 40 are the same as the diameter and spacing of the four first positioning holes 14 on the substrate 10. Furthermore, four stepped support platforms 42 protrude from the four corners of the lower surface of the upper pressure plate 40 along the second positioning holes 43. Understandably, when the upper pressure plate 40 is placed on the substrate 10, at least two pins are passed through the diagonally opposite first positioning holes 14 and second positioning holes 43 to position and connect the upper pressure plate 40 to the substrate 10. Moreover, each grid 41 is aligned with two vertically spaced welding stations 111 within the grid 41. The four support platforms 42 are placed at the four corners of the substrate 10 and limit the distance between the upper pressure plate 40 and the substrate 10.
[0061] In some implementations... Figure 6 for Figure 4 A magnified structural diagram of the portion at BB. Figure 7 for Figure 6 Please refer to the enlarged structural diagram at point D as well. Figures 1-7 The upper pressure plate 40 is also provided with a recessed blocking part (44). The blocking part (44) and the positioning part are located on the lower surface of the upper pressure plate 40. The blocking part (44) is formed in the length direction from the surface of the upper pressure plate 40 that covers the substrate 10 and abuts against the second shim 30. When the upper pressure plate 40 covers the substrate 10 and the first positioning hole 14 and the second positioning hole 43 are through which the pins are inserted, the side of the blocking part (44) abuts against the outer side of the second shim 30 in the height direction, thereby restricting the second shim 30 so that it cannot move in the height direction.
[0062] In some implementations, such as Figures 1-7 As shown, in order to ensure the stability of the welding process and improve the welding efficiency, the welding station 111 is provided with solder, the workpiece to be welded is placed on the solder, and the workpiece to be welded is welded to the substrate 10 using a formic acid reflow soldering process to form a connection.
[0063] Specifically, the welding fixture 100 of this application can be applied to a formic acid reflow soldering process. First, insulating sheets (not shown) are attached to the upper and lower sides and the middle limiting portion 12 area of the substrate 10. Two first shims 20 are placed in the limiting portion 12 of the substrate 10. Then, four second shims A 34 are placed side by side on one side of the upper part of the substrate 10, and four second shims B 35 are placed side by side on one side of the lower part of the substrate 10. The notches 31 of the second shims A 34 and the second shims B 35 are respectively engaged with the sides of the corresponding soldering station 111. The paste solder is applied to the soldering station 111 or the sheet solder is placed on the soldering station 111 and the second shims 30 are used to... Positioning is done at notch 31, and then the upper pressure plate 40 is placed on top of the substrate 10. The upper side of the blocking part (44) of the upper pressure plate 40 abuts against the outer side of the second shim 34, and the lower side of the blocking part (44) of the upper pressure plate 40 abuts against the outer side of the second shim 35. The four second positioning holes 43 of the upper pressure plate 40 correspond to the four first positioning holes 14 of the substrate 10. At least two pins are passed through the two second positioning holes 43 and the first positioning holes 14 located on the same diagonal. Then the workpiece to be welded is placed on the welding station 111 in the grid 41. Finally, the welding fixture 100 is placed in the welding furnace, and formic acid gas is introduced to weld the workpiece to be welded to the welding station 111 of the substrate 10 into a whole.
[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.
Claims
1. A welding fixture, characterized in that, The system includes a substrate (10) and at least two sets of soldering stations (11) disposed on the substrate (10) and spaced apart. Each set of soldering stations (11) includes a plurality of spaced soldering stations (111) for connecting parts to be soldered. A limiting part (12) is provided between the sets of soldering stations (11). An interval area (13) is provided between two adjacent soldering stations (111) in the same set of soldering stations (11). The welding fixture also includes: The first shim (20) is detachably installed in the limiting part (12); and The second shim (30) is detachably disposed on both sides of the substrate (10). The second shim (30) has a plurality of recessed notches (31). The notches (31) are engaged with a corresponding soldering station (111), and a second clearance (32) is formed between the second shim (30) and the soldering station (111).
2. The welding fixture according to claim 1, characterized in that, The first raised part (20) has multiple first clearance positions (21) on both sides, and the first clearance positions (21) are corresponding to the interval area (13).
3. The welding fixture according to claim 1, characterized in that, The welding fixture includes multiple first shims (20) spliced together. The first shims (20) are also provided with through stress holes (22), and the multiple stress holes (22) are arranged at intervals.
4. The welding fixture according to claim 1, characterized in that, The welding fixture also includes a plurality of second shims (30) spaced apart. Each of the two adjacent second shims (30) in the same welding station group (11) is provided with a corner (33) on one side. The corner (33) is respectively engaged with one side of a welding station (111).
5. The welding fixture according to claim 1, characterized in that, The distance between the bottom surface of the second clearance position (32) and the side of the welding station (111) is greater than half the distance by which the side of the welding station (111) is inserted into the notch (31), and the width of the second clearance position (32) is greater than half the width of the notch (31).
6. The welding fixture according to claim 1, characterized in that, The protruding thickness of the welding station (111) is greater than the thickness of the first shim (20) and the thickness of the second shim (30).
7. The welding fixture according to claim 1, characterized in that, The first shim (20) has a first handhold (23) on one side, and the first handhold (23) protrudes from both sides of the substrate (10).
8. A welding fixture according to claim 1, characterized in that, The welding fixture also includes an upper pressure plate (40) located on the substrate (10), the upper pressure plate (40) having a plurality of spaced and through grids (41). The upper pressure plate (40) is placed on the substrate (10), and the two welding stations (111) are located within the projection range of a grid (41). The workpiece to be welded is placed inside the grid (41), and the workpiece to be welded is welded to the welding station (111).
9. A welding fixture according to claim 8, characterized in that, The upper pressure plate (40) is also provided with a support platform (42). The support platform (42) is located at the four corners of the upper pressure plate (40) and protrudes to form a step. The four support platforms (42) support the upper pressure plate (40) on the substrate (10).
10. A welding fixture according to claim 1, characterized in that, The soldering station (111) is provided with solder, the workpiece to be soldered is placed on the solder, and the workpiece to be soldered is connected to the substrate (10) through the solder.