A printed board assembly welding fixture and method of use thereof

Abstract

The application provides a printed board assembly welding tool and a use method thereof. The printed board assembly welding tool comprises a bottom plate, a plurality of housings for heat insulation protection of connectors of a printed board assembly and a plurality of supporting mechanisms for supporting printed boards of the printed board assembly, the plurality of housings are installed on the bottom plate, and the plurality of supporting mechanisms are installed on both sides of the plurality of housings. The bending plug connector use equipment welding is realized, various connectors extending out of the printed board can be batch welded, the J-type connector can be selectively welded by using the selective wave soldering and the wave soldering equipment, the printed board pad can be fully preheated and wetted, the connector pin can be 100% tinned, the tinning problem of the connector welding point is solved, the welding quality and use requirement of the radar product are met, the production quality is improved, and the welding efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of electrical interconnection technology, and in particular to a welding fixture for printed circuit board assemblies and its method of use. Background Technology

[0002] With the development of aerospace technology, the performance and reliability indicators of aerospace products are constantly improving, which places stricter requirements on the reliability of printed circuit board (PCB) assemblies. Furthermore, given the current challenging quality situation, eliminating potential quality issues at the production stage has become paramount. As a fundamental unit of radar products, PCB assemblies make improving the quality of electronic components particularly crucial. Therefore, more effective quality control of PCB assemblies and enhanced product reliability are key aspects of current product manufacturing.

[0003] Printed circuit board (PCB) assemblies are fundamental to aerospace radar products, and the welding quality of these assemblies directly affects the overall performance of the radar system. Currently, J-type connectors are the most common assemblies for radar components and are widely used in various levels of aerospace electronic products. Because these connectors are J-type bent plugs that protrude beyond the board after installation, they cannot be wave-soldered or selectively wave-soldered using common soldering equipment and must be soldered manually. Traditional manual soldering of connectors cannot meet the current production efficiency and quality requirements, both in terms of soldering efficiency and quality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a welding fixture for printed circuit board assemblies and a method for using it, in order to address the shortcomings of the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A welding fixture for printed circuit board assembly includes: a base plate, a plurality of housings for heat insulation protection of connectors of printed circuit board assembly, and a plurality of support mechanisms for supporting printed circuit boards of printed circuit board assembly, wherein the plurality of housings are mounted on the base plate, and the plurality of support mechanisms are mounted on both sides of the plurality of housings.

[0006] The beneficial effects of adopting the technical solution of this invention are: enabling the use of equipment to weld bent plug connectors, enabling batch welding of various connectors extending outside the printed circuit board, allowing J-type connectors to be welded using selective wave soldering and wave soldering equipment, ensuring that the printed circuit board pads are fully preheated and wetted, and allowing the connector pins to achieve 100% solder penetration, solving the problem of solder penetration at connector solder joints, meeting the welding quality and usage requirements of radar products, improving production quality, and increasing welding efficiency.

[0007] Furthermore, the support mechanism includes: a cylinder and a pressure block for supporting the printed circuit board, the cylinder being mounted on the base plate, and the pressure block being slidably mounted in the cylinder.

[0008] The beneficial effect of adopting the above-mentioned further technical solution is that the adjustable pressure block has the function of fixing the printed circuit board. The pressure block is fixed at one end by a screw on the tooling, so that the pressure block can adjust its height and force according to the height of the printed circuit board to ensure that the printed circuit board is fixed.

[0009] Furthermore, a spring is provided in the cylinder, one end of the spring is connected to the bottom plate, and the other end of the spring is connected to the pressure block. The bottom of the pressure block is provided with a first protrusion, and the top of the cylinder is provided with a second protrusion. The first protrusion abuts against the second protrusion.

[0010] The beneficial effect of adopting the above-mentioned further technical solution is that the adjustable pressure block has the function of fixing the printed circuit board. The pressure block is fixed at one end by a screw on the tooling, and a spring device is added to the screw so that the pressure block can adjust its height and force according to the height of the printed circuit board to ensure that the printed circuit board is fixed.

[0011] Furthermore, the support mechanism also includes: a plurality of support edges for supporting the printed circuit board, the plurality of support edges being adjacent to the plurality of support mechanisms, and the plurality of support edges protruding from the base plate.

[0012] The beneficial effect of adopting the above-mentioned further technical solution is that the tooling is designed with large-area support edges on both sides, which can effectively support the printed circuit board assembly and prevent deformation after being heated due to excessive weight.

[0013] Furthermore, the top of the base plate and the top of the housing have openings, and both the base plate and the housing are rectangular frame structures.

[0014] The beneficial effects of adopting the above-mentioned further technical solutions are: They match the structural characteristics of the J-type connector, facilitating the housing to enclose the connector and providing thermal insulation protection, while also reducing the deformation of the J-type connector and preventing molten solder from splashing into it. They meet the temperature requirements for normal soldering, improve solder penetration, and ensure soldering consistency. The number and structure of connectors that can be soldered can be flexibly selected, making it easier to meet the production demands of radar components. The rectangular frame design not only provides thermal insulation but also serves as a connector alignment feature, preventing deformation of the J-type connector after exposure to high temperatures.

[0015] Furthermore, the printed circuit board assembly includes a printed circuit board and a connector, the connector being mounted on the printed circuit board.

[0016] The beneficial effect of adopting the above-mentioned further technical solution is that the printed circuit board and the connector are assembled into a printed circuit board assembly, which facilitates the installation and soldering of the printed circuit board assembly.

[0017] Furthermore, the two sides of the connector are respectively connected to the printed circuit board by screws, and the base plate is provided with multiple pairs of screw support cylinders for supporting the screws, with each pair of screw support cylinders corresponding to one of the two sides of the housing.

[0018] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A fixing device, namely a screw, is designed between the connector and the printed circuit board, which effectively prevents gaps from forming between them and causing poor soldering. Considering the screw-mounting characteristics of the connector, a cylindrical device with a round hole, namely a screw support sleeve, is designed to protect the screw and prevent molten solder from flowing into the screw hole and clogging it. The connector is first screwed into the printed circuit board assembly, and then soldered. To prevent molten solder from splashing into the J-type connector screws, a cylindrical frame device, namely a screw support sleeve, is designed for protection.

[0019] Furthermore, the connector is a J-type connector, and the base plate, the housing, and the support mechanism are all made of synthetic stone slab material.

[0020] The beneficial effects of adopting the above-mentioned further technical solutions are: meeting the temperature required for normal welding, improving solder penetration, and ensuring welding consistency. The tooling is made of high-temperature resistant materials; the synthetic stone slab has high elasticity and impact resistance, as well as high corrosion resistance, ensuring uniform heat distribution on the printed circuit board and maintaining its original dimensions even after prolonged use. It is not easily deformed at welding temperatures, ensuring the flatness of the printed circuit board, preventing deformation, and guaranteeing welding quality.

[0021] Furthermore, the present invention also provides a method for using a welding fixture for printed circuit board assemblies. Based on any one of the above-described welding fixtures for printed circuit board assemblies, the method for using the welding fixture for printed circuit board assemblies includes:

[0022] The connectors are mounted on the printed circuit board to form a printed circuit board assembly;

[0023] The printed circuit boards of the printed circuit board assembly are pre-baked and dehumidified.

[0024] The connector of the printed circuit board assembly is installed in the housing of the soldering fixture of the printed circuit board assembly;

[0025] The printed circuit board of the printed circuit board assembly is placed on the support mechanism of the printed circuit board assembly welding fixture.

[0026] The printed circuit board assembly welding fixture with the printed circuit board assembly is placed into the wave soldering equipment for preheating and welding.

[0027] After welding is completed, the printed circuit board assembly is removed from the printed circuit board assembly welding fixture and stored.

[0028] The beneficial effects of adopting the technical solution of this invention are: enabling the use of equipment to weld bent plug connectors, enabling batch welding of various connectors extending outside the printed circuit board, allowing J-type connectors to be welded using selective wave soldering and wave soldering equipment, ensuring that the printed circuit board pads are fully preheated and wetted, and allowing the connector pins to achieve 100% solder penetration, solving the problem of solder penetration at connector solder joints, meeting the welding quality and usage requirements of radar products, improving production quality, and increasing welding efficiency.

[0029] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0030] Figure 1 This is one of the structural schematic diagrams of the connector provided in an embodiment of the present invention.

[0031] Figure 2 This is a second schematic diagram of the connector provided in an embodiment of the present invention.

[0032] Figure 3 The third schematic diagram of the connector provided in the embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the structure of a printed circuit board assembly provided in an embodiment of the present invention.

[0034] Figure 5 This is one of the structural schematic diagrams of the welding fixture for printed circuit board assemblies provided in an embodiment of the present invention.

[0035] Figure 6 This is the second schematic diagram of the welding fixture for printed circuit board assemblies provided in an embodiment of the present invention.

[0036] Figure 7 This is a schematic diagram of the support mechanism provided in an embodiment of the present invention.

[0037] Figure 8 This is one of the schematic flowcharts illustrating the method of using the welding fixture for printed circuit board assemblies provided in the embodiments of the present invention.

[0038] Figure 9 This is the second illustrative flowchart illustrating the method of using the welding fixture for printed circuit board assemblies provided in this embodiment of the invention.

[0039] Reference numerals: 1. Base plate; 2. Printed circuit board assembly; 3. Connector; 4. Housing; 5. Printed circuit board; 6. Support mechanism; 7. Cylinder; 8. Pressure block; 9. Spring; 10. First protrusion; 11. Second protrusion; 12. Support edge; 14. Screw; 15. Screw support cylinder. Detailed Implementation

[0040] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0041] like Figures 1 to 7 As shown, an embodiment of the present invention provides a welding fixture for a printed circuit board assembly, including: a base plate 1, a plurality of housings 4 for heat insulation protection of connectors 3 of the printed circuit board assembly 2, and a plurality of support mechanisms 6 for supporting the printed circuit boards 5 of the printed circuit board assembly 2. The plurality of housings 4 are mounted on the base plate 1, and the plurality of support mechanisms 6 are mounted on both sides of the plurality of housings 4.

[0042] The beneficial effects of adopting the technical solution of this invention are: enabling the use of equipment to weld bent plug connectors, enabling batch welding of various connectors extending outside the printed circuit board, allowing J-type connectors to be welded using selective wave soldering and wave soldering equipment, ensuring that the printed circuit board pads are fully preheated and wetted, and allowing the connector pins to achieve 100% solder penetration, solving the problem of solder penetration at connector solder joints, meeting the welding quality and usage requirements of radar products, improving production quality, and increasing welding efficiency.

[0043] like Figures 1 to 7 As shown, the support mechanism 6 further includes a cylinder 7 and a pressure block 8 for supporting the printed circuit board 5. The cylinder 7 is mounted on the base plate 1, and the pressure block 8 is slidably mounted in the cylinder 7.

[0044] The beneficial effect of adopting the above-mentioned further technical solution is that the adjustable pressure block has the function of fixing the printed circuit board. The pressure block is fixed at one end by a screw on the tooling, so that the pressure block can adjust its height and force according to the height of the printed circuit board to ensure that the printed circuit board is fixed.

[0045] like Figures 1 to 7 As shown, the cylinder 7 is further provided with a spring 9, one end of the spring 9 is connected to the bottom plate 1, and the other end of the spring 9 is connected to the pressure block 8. The bottom of the pressure block 8 is provided with a first protrusion 10, and the top of the cylinder 7 is provided with a second protrusion 11. The first protrusion 10 and the second protrusion 11 abut against each other.

[0046] The beneficial effect of adopting the above-mentioned further technical solution is that the adjustable pressure block has the function of fixing the printed circuit board. The pressure block is fixed at one end by a screw on the tooling, and a spring device is added to the screw so that the pressure block can adjust its height and force according to the height of the printed circuit board to ensure that the printed circuit board is fixed.

[0047] like Figures 1 to 7 As shown, the support mechanism 6 further includes a plurality of support edges 12 for supporting the printed circuit board 5, the plurality of support edges 12 being adjacent to the plurality of support mechanisms 6, and the plurality of support edges 12 protruding from the base plate 1.

[0048] The beneficial effect of adopting the above-mentioned further technical solution is that the tooling is designed with large-area support edges on both sides, which can effectively support the printed circuit board assembly and prevent deformation after being heated due to excessive weight.

[0049] A through hole may be provided in the center of the base plate, and multiple housings 4 and multiple support mechanisms 6 are arranged around the through hole. The through hole is used to install screw pads to fix the printed circuit board.

[0050] like Figures 1 to 7 As shown, the top of the base plate 1 and the top of the housing 4 are open, and both the base plate 1 and the housing 4 are rectangular frame structures.

[0051] The beneficial effects of adopting the above-mentioned further technical solutions are: They match the structural characteristics of the J-type connector, facilitating the housing to enclose the connector and providing thermal insulation protection, while also reducing the deformation of the J-type connector and preventing molten solder from splashing into it. They meet the temperature requirements for normal soldering, improve solder penetration, and ensure soldering consistency. The number and structure of connectors that can be soldered can be flexibly selected, making it easier to meet the production demands of radar components. The rectangular frame design not only provides thermal insulation but also serves as a connector alignment feature, preventing deformation of the J-type connector after exposure to high temperatures.

[0052] like Figures 1 to 7 As shown, the printed circuit board assembly 2 further includes a printed circuit board 5 and a connector 3, the connector 3 being mounted on the printed circuit board 5.

[0053] The beneficial effect of adopting the above-mentioned further technical solution is that the printed circuit board and the connector are assembled into a printed circuit board assembly, which facilitates the installation and soldering of the printed circuit board assembly.

[0054] like Figures 1 to 7 As shown, the two sides of the connector 3 are connected to the printed circuit board 5 by screws 14 respectively. The base plate 1 is provided with multiple pairs of screw support cylinders 15 for supporting the screws 14. Each pair of screw support cylinders 15 is located on both sides of the housing 4.

[0055] The beneficial effects of adopting the above-mentioned further technical solution are as follows: A fixing device, namely a screw, is designed between the connector and the printed circuit board, which effectively prevents gaps from forming between them and causing poor soldering. Considering the screw-mounting characteristics of the connector, a cylindrical device with a round hole, namely a screw support sleeve, is designed to protect the screw and prevent molten solder from flowing into the screw hole and clogging it. The connector is first screwed into the printed circuit board assembly, and then soldered. To prevent molten solder from splashing into the J-type connector screws, a cylindrical frame device, namely a screw support sleeve, is designed for protection.

[0056] like Figures 1 to 7 As shown, the connector 3 is a J-type connector, and the base plate 1, the housing 4, and the support mechanism 6 are all made of synthetic stone slab material.

[0057] The beneficial effects of adopting the above-mentioned further technical solutions are: meeting the temperature required for normal welding, improving solder penetration, and ensuring welding consistency. The tooling is made of high-temperature resistant materials; the synthetic stone slab has high elasticity and impact resistance, as well as high corrosion resistance, ensuring uniform heat distribution on the printed circuit board and maintaining its original dimensions even after prolonged use. It is not easily deformed at welding temperatures, ensuring the flatness of the printed circuit board, preventing deformation, and guaranteeing welding quality.

[0058] Solving the problem of wave soldering connectors is essential for improving THT (Through Hole Technology) production efficiency, reducing production costs, and saving manpower and resources. To address the numerous issues associated with manually soldering J-type connectors, this invention provides a soldering fixture for printed circuit board assemblies. Based on the J-type connector structure design, it can solder various connectors extending beyond the board, and can use wave soldering for J-type connectors, enabling the use of equipment for soldering right-angle plug connectors, thereby significantly improving production efficiency and quality. It breaks away from the original fixed production model, enabling the use of equipment for soldering J-type connectors; it also solves the problem of solder penetration through connector solder joints. It perfectly matches the structural characteristics of J-type connectors, meeting the actual soldering quality and production efficiency requirements of radar components. Furthermore, it leverages the structural characteristics of J-type connectors to achieve flexible production needs, allowing for flexible selection of the number and structure of connectors to be soldered, facilitating the fulfillment of radar component production demands. For J-type connectors that can be selectively wave soldered or require wave soldering, it solves the problem of solder penetration through connector solder joints, improving soldering efficiency and quality.

[0059] The selection and design of tooling are crucial. Wave soldering temperatures typically reach 260℃. At this temperature, some connector bodies are not heat-resistant, and some thin but large PCBs (Printed Circuit Boards) may deform or bend. The pads of some through-hole components on the PCB are very small and highly sensitive to soldering positions. Once the PCB deforms or bends, the soldering effect of these components will be greatly affected, potentially resulting in defects such as excessive or insufficient solder, bridging, missing solder joints, and cold solder joints. All wave soldering tooling must be made of high-temperature resistant materials that are not easily deformed at the soldering temperature, ensuring the flatness of the PCB and further guaranteeing soldering quality.

[0060] Through research and experimentation with various materials, synthetic stone slabs were ultimately selected. Synthetic stone slabs possess high elasticity and impact resistance, as well as excellent corrosion resistance, ensuring even heat distribution on the PCB board and maintaining their dimensional integrity even after prolonged use. The heat resistance temperature of synthetic stone is generally between 300 and 350°C, and it can withstand temperatures up to 385°C for short periods, demonstrating excellent high-temperature resistance and ensuring long-term colorfastness. It is commonly used to manufacture high-temperature resistant components.

[0061] The design methodology for J-type connector tooling is divided into two categories: one is to classify and summarize the connector's structural dimensions to obtain the optimal design dimensions; the other is to design the tooling's operating environment and required functions. J-type connector specifications: J-type connectors are mostly J30J models, with up to 100 pins. The connector consists of a socket and a plug. The soldering of the socket is particularly important, as the socket is extremely sensitive to temperature. Excessive temperature can deform the socket's orifice, causing misalignment. Therefore, radar products place great emphasis on the soldering quality and requirements of the connectors. The connector tooling design must ensure that the connector's shape is not affected by temperature, thus preventing deformation and affecting subsequent product mating. Connector product characteristics: Operating temperature range: -65~125℃; Socket structure: hyperboloid spring socket; Spacing: 2.54mm; Termination methods: dip soldering, soldering, wrapping; Contact diameter: 0.76mm; Dielectric withstand voltage: 1500V.

[0062] The tooling (i.e., the soldering fixture for printed circuit board assembly) is designed with materials that provide heat insulation and withstand temperatures above 300℃. The fixture's structural design utilizes a rectangular frame (housing) that perfectly encloses the J-type connector, effectively providing heat insulation protection for the connector body and reducing connector deformation. This tooling effectively prevents molten solder from splashing into the connector. Furthermore, a fixing device (screw) is designed between the connector and the printed circuit board to effectively prevent gaps and soldering defects. Considering the screw-mounted characteristics of the connector, a cylindrical device with round holes (i.e., a screw support sleeve) is designed to protect the screws, preventing molten solder from flowing into and clogging the screw holes.

[0063] 1) In terms of the tooling structure, an adjustable pressure block with the function of fixing the printed circuit board is designed. The pressure block is fixed at one end by a screw (cylinder) on the tooling, and a spring is added to the screw so that the pressure block can adjust its height and force according to the height of the printed circuit board to ensure that the printed circuit board is fixed.

[0064] 2) Support edge design: The tooling is designed with large support edges on both sides, which can effectively support the printed circuit board assembly and prevent deformation due to excessive weight and heat.

[0065] 3) Rectangular frames: The tooling design includes four rectangular frames (shells) that can simultaneously weld four printed circuit board assemblies with J-type connectors. The rectangular frame design not only provides heat insulation but also serves to correct the connectors, preventing deformation of the J-type connectors after exposure to high temperatures.

[0066] 4) Connector screw placement area (screw support sleeve): The connector needs to be screwed into the printed circuit board assembly first, and then the connector is soldered. To prevent the J-type connector screw from being splashed with molten solder, a cylindrical frame device is designed for protection.

[0067] 5) The groove depth of the base plate is 3mm to 5mm, which is 0.2mm to 0.5mm thicker than the printed circuit board.

[0068] 6) The screw hole of the screw support sleeve has a radius of 0.25mm and a depth of 0.5mm.

[0069] 7) The connector slot in the housing measures 8.1mm*95mm.

[0070] In the production process of printed circuit board (PCB) assemblies with J-connectors, the PCB assembly welding fixture made using this method meets the welding quality and usage requirements of radar products. Compared with the original manual welding method, this method can fully meet the welding requirements of J-type connectors and has the following advantages: 1. Improved connector welding efficiency based on the fixture: Compared with manual connector welding, operators using the connector welding fixture can perform large-scale wave soldering or selective wave soldering of PCB assemblies with connectors, improving production efficiency and reducing user labor intensity. 2. Improved connector welding quality based on the fixture: For batch products, the fixture can perform various wave soldering or selective wave soldering of connectors. The PCB pads can be fully preheated and wetted, ensuring 100% solder penetration of the connector pins, thereby guaranteeing product quality.

[0071] like Figures 8 to 9 As shown, in addition, the present invention also provides a method for using a welding fixture for printed circuit board assemblies. Based on any one of the above-described welding fixtures for printed circuit board assemblies, the method for using the welding fixture for printed circuit board assemblies includes:

[0072] S1. Install the connector on the printed circuit board to form a printed circuit board assembly;

[0073] S2. Pre-bake and dehumidify the printed circuit boards of the printed circuit board assembly.

[0074] S3. Install the connector of the printed circuit board assembly into the housing of the printed circuit board assembly welding fixture;

[0075] S4. Place the printed circuit board of the printed circuit board assembly on the support mechanism of the printed circuit board assembly welding fixture.

[0076] S5. Place the printed circuit board assembly welding fixture with the printed circuit board assembly into the wave soldering equipment for preheating and welding.

[0077] S6. After welding is completed, remove the printed circuit board assembly from the printed circuit board assembly welding fixture and store it.

[0078] The beneficial effects of adopting the technical solution of this invention are: enabling the use of equipment to weld bent plug connectors, enabling batch welding of various connectors extending outside the printed circuit board, allowing J-type connectors to be welded using selective wave soldering and wave soldering equipment, ensuring that the printed circuit board pads are fully preheated and wetted, and allowing the connector pins to achieve 100% solder penetration, solving the problem of solder penetration at connector solder joints, meeting the welding quality and usage requirements of radar products, improving production quality, and increasing welding efficiency.

[0079] like Figures 8 to 9 The diagram illustrates the usage method of the soldering fixture for printed circuit board assemblies, specifically the usage method of the universal wave soldering fixture for J-type connectors on radar high-density boards:

[0080] Step 1: Analyze the dimensions and structure of the connector based on its structural and manufacturing characteristics.

[0081] Step 2: Based on the structural diagram of the connector after it is installed on the printed circuit board, design the tooling structure for the analyzed connector and the connector after installation.

[0082] Step 3: Select tooling materials based on the structural and manufacturing characteristics of the connector.

[0083] Step 4: Pre-bake the printed circuit board to remove moisture.

[0084] Step 5: The operator, in conjunction with the design drawings and process documents, tin-solders the components to be soldered and inserts them into the corresponding holes.

[0085] Step 6: After assembling the connector and printed circuit board using the tooling, perform structural assembly with the tooling.

[0086] Step 7: Place the assembled printed circuit board into the wave soldering equipment for preheating and soldering.

[0087] Step 8: After the soldering is completed, wait for the printed circuit board to cool down, then remove the printed circuit board from the tooling and store it.

[0088] like Figure 9As shown, the printed circuit board is preheated and dehumidified, then assembled with the tooling structure, THT devices are tinned and shaped, THT devices are inserted, the printed circuit board is preheated, wave soldering is performed, the printed circuit board is cooled, and the tooling is disassembled.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding fixture for printed circuit board assemblies, characterized in that, include: The assembly includes a base plate, multiple housings for providing thermal insulation protection to the connectors of the printed circuit board assembly, and multiple support mechanisms for supporting the printed circuit boards of the printed circuit board assembly. The multiple housings are mounted on the base plate, and the multiple support mechanisms are mounted on both sides of the multiple housings. The support mechanism includes: a cylindrical body and a pressure block for supporting the printed circuit board. The cylindrical body is mounted on the base plate, and the pressure block is slidably mounted in the cylindrical body. A spring is provided in the cylindrical body, one end of which is connected to the base plate, and the other end of which is connected to the pressure block. A first protrusion is provided at the bottom of the pressure block, and a second protrusion is provided at the top of the cylindrical body. The first protrusion abuts against the second protrusion. The printed circuit board assembly includes a printed circuit board and a connector. The connector is mounted on the printed circuit board. The connector is a J-type connector. The base plate, the housing, and the support mechanism are all made of synthetic stone slab material. The support mechanism also includes: multiple support edges for supporting the printed circuit board. The multiple support edges are adjacent to the multiple support mechanisms and protrude from the base plate. The top of the base plate and the top of the housing are open. The base plate and the housing are both rectangular frame structures. The two sides of the connector are respectively connected to the printed circuit board by screws. The base plate is provided with multiple pairs of screw support cylinders for supporting the screws. Each pair of screw support cylinders is located on both sides of the housing.

2. A method for using a welding fixture for printed circuit board assemblies, characterized in that, Based on the printed circuit board assembly welding fixture according to claim 1, a method of using the printed circuit board assembly welding fixture includes: The connectors are mounted on the printed circuit board to form a printed circuit board assembly; The printed circuit boards of the printed circuit board assembly are pre-baked and dehumidified. The connector of the printed circuit board assembly is installed in the housing of the soldering fixture of the printed circuit board assembly; The printed circuit board of the printed circuit board assembly is placed on the support mechanism of the printed circuit board assembly welding fixture. The printed circuit board assembly welding fixture with the printed circuit board assembly is placed into the wave soldering equipment for preheating and welding. After welding is completed, the printed circuit board assembly is removed from the printed circuit board assembly welding fixture and stored.

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