Welding assembly for automobile rear backrest seat framework and welding method thereof

Abstract

The invention discloses an automobile rear backrest seat framework welding assembly and a welding method thereof, and relates to the field of automobile seat frameworks, the automobile rear backrest seat framework welding assembly comprises a chair back framework assembly, the bottom end of the chair back framework assembly is movably connected with a seat cushion framework assembly, and the top end of the chair back framework assembly is fixedly connected with a headrest; a back plate is fixedly connected to the inner wall of the chair back framework assembly, and a movable groove is formed in the outer wall of the back plate in a penetrating mode. The two back supporting plates are used for supporting the upper portion of the chair back framework assembly, so that the back of a passenger is effectively supported, rotation of the waist supporting plate and the connecting shaft is matched with elastic contraction of the compression spring between the waist supporting plate and the back plate, the waist of the passenger is supported by the waist supporting plate, and the back of the passenger is supported by the back supporting plate. And the elastic deformation of the compression spring can adapt to the waist leaning strength of the passenger to realize self-adaptive angle strength feedback, so that the seat can provide excellent waist and back support, and the comfort of the passenger is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seat frames, in particular to a welding assembly for an automobile rear backrest seat frame and a welding method thereof. Background Art

[0002] With the continuous development of society, the automobile industry has also been increasingly improved, and people have higher and higher requirements for the comfort of car seats. The car rear back seat frame welding assembly is one of the important components of the car seat. Its main function is to provide support and shape for the seat while ensuring the safety and comfort of the seat.

[0003] However, in the prior art, the existing rear seat frames of automobiles are difficult to provide good waist and back support for passengers, which can easily cause discomfort during long-term riding and affect the riding experience. In addition, the rear seat frames cannot provide sufficient protection in the event of a collision, which can easily cause passenger injuries. Summary of the invention

[0004] The object of the present invention is to provide a welding assembly for a rear back seat frame of an automobile and a welding method thereof, so as to solve the problem proposed in the above background technology that the existing rear back seat frame of an automobile is difficult to provide good waist and back support for the passengers, which easily leads to discomfort during long-term riding and affects the riding experience, and the rear back seat frame cannot provide sufficient protection in the event of a collision, which easily leads to passenger injuries.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a welding assembly for a rear backrest seat frame of an automobile and a welding method thereof, comprising a seat back frame assembly, the bottom end of the seat back frame assembly is movably connected to a seat cushion frame assembly, the top end of the seat back frame assembly is fixedly connected to a headrest, the inner wall of the seat back frame assembly is fixedly connected to a back plate, the outer wall of the back plate is penetrated by a movable groove, the inner wall of the movable groove is fixedly connected to a connecting shaft, the outer wall of the connecting shaft is movably sleeved with a lumbar support plate, back support plates are provided on both sides of the lumbar support plate, the bottom end of the back support plate is fixedly connected to the outer wall of the connecting shaft, the top end of the back support plate is fixedly connected to a cross bar, the two ends of the cross bar are fixedly connected to the inner wall of the seat back frame assembly, the lower outer wall of the back plate is fixedly connected to a limiting column, the outer wall of the limiting column is movably sleeved with a compression spring, and the top end of the compression spring is fixedly connected to the outer wall of the lumbar support plate.

[0006] Preferably, the chair back frame assembly includes side support plates, and the number of the side support plates is provided with two, a cross beam is fixedly connected between the top ends of the two side support plates, a support rod is fixedly connected to the top surface of the cross beam, and the top end of the support rod is fixedly connected to the bottom surface of the headrest.

[0007] Preferably, a support tube is fixedly connected between the bottom ends of the two side support plates, one end of the support tube passes through the outer wall of the side support plate and is rotatably connected to a fixed connecting plate, the outer wall of the fixed connecting plate is fixedly connected to a connecting tube, the interior of the connecting tube is connected to the interior of the support tube, and a through hole is opened through the outer wall of the support tube.

[0008] Preferably, the other end of the support tube passes through the outer wall of the side support plate and is connected to an angle adjuster, the angle adjuster includes connecting plate one and connecting plate two, the outer wall of connecting plate two passes through a rotating shaft that is rotatably connected, one end of the rotating shaft is fixedly connected to the outer wall of connecting plate one, and the other end of the rotating shaft is fixedly connected to one end of the support tube.

[0009] Preferably, the upper outer wall of the connecting plate 2 is fixedly connected to the limiting plate 1, the outer sleeve of the limiting plate 1 is provided with a spiral spring, the inner end of the spiral spring is fixedly connected to the outer wall of the limiting plate 1, the outer end of the spiral spring is fixedly connected to the limiting plate 2, one end of the limiting plate 2 is fixedly connected to the outer wall of the connecting plate 1, and the top of the connecting plate 1 is fixedly connected to the outer wall of the side support plate.

[0010] Preferably, the seat cushion frame assembly includes a bottom frame plate, a support frame, a fixed plate and a fixed rod, and the outer walls on both sides of the bottom frame plate are provided with limiting grooves, and the two ends of the fixed rod are movably connected to the inner walls of the limiting grooves, and the two ends of the fixed rod are fixedly connected to the outer wall of the fixed plate, and the outer wall of the fixed plate is fixedly connected to the outer wall of the support frame.

[0011] Preferably, a positioning slot is formed through the top surface of the support frame, a connecting block is fixedly connected to the inner wall of the positioning slot, a reinforcing plate is fixedly connected to the bottom end of the connecting block, and a mounting screw hole is formed through the outer wall of the reinforcing plate.

[0012] A welding method for a rear seat frame assembly of an automobile comprises the following steps: S1. First, place the components of the seat back frame assembly and the seat cushion frame assembly on the welding platform, and position and fix them by means of a clamp; S2. Preset welding parameters and preheat the area to be welded to ensure uniform temperature in the welding area; S3, welding and fixing the top ends of the two side support plates to the two ends of the cross beam, welding the two ends of the support pipe to the bottom ends of the side support plates, and welding and fixing the back plate and its accessories, the back support plate and the cross bar to the side support plates in turn; S4, respectively welding and fixing the connection between the angle adjuster and the fixed connecting plate and the seat back frame assembly and the seat cushion frame assembly, and finally welding and fixing the seat cushion frame assembly in sequence; S5. After welding is completed, let the welded part cool naturally, and check and correct it to ensure that the weld quality meets the requirements; S6. Deburr and grind the welding parts to ensure a smooth surface, and perform rust-proof treatment on the welding parts.

[0013] Preferably, in step S2, the preheating treatment temperature is 280°C-400°C, and the preheating method is heating with an infrared heater.

[0014] Preferably, in step S5, the inspection includes appearance, welding depth and weld strength as well as non-destructive testing.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, two back support plates are used to provide support for the upper part of the chair back frame assembly, thereby achieving effective support for the back of the occupant. The rotation of the lumbar support plate and the connecting shaft is utilized, and the elastic contraction of the compression spring between the lumbar support plate and the back plate is coordinated, so that the waist of the occupant is supported by the lumbar support plate, and the elastic deformation of the compression spring can be used to adapt to the lumbar support force of the occupant to achieve adaptive angle force feedback, so that the present invention can provide excellent waist and back support and improve the comfort of the occupant.

[0016] 2. In the present invention, the two ends of the support tube are respectively rotatably arranged with the angle adjuster and the fixed connecting plate, so that when the user applies pressure to adjust the angle of the chair back frame assembly, the side support plate drives the support tube to rotate synchronously, thereby driving the limit plate 2 through the rotating shaft and the connecting plate 1 to expand or contract the spiral spring, and utilizing the elastic deformation of the spiral spring to allow the user to quickly rebound and reset the chair back frame assembly after releasing the pressure, so that the user can quickly adjust the angle between the chair back frame assembly and the seat cushion frame assembly.

[0017] 3. In the present invention, the bottom frame plate and the support frame are set to achieve upper and lower separation, which is convenient for the subsequent seat cushion frame assembly to be connected and fixed to the seat cushion and the installation position in the vehicle respectively, which is convenient for operators to install quickly and improves the installation efficiency of the present invention. By setting the reinforcement plate, the strength of the center of the top surface of the seat cushion frame assembly is improved, making the present invention less likely to deform when riding and providing stable support. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a welding assembly for a rear seat frame of an automobile according to the present invention; Figure 2 The invention discloses a seat back frame assembly for welding a rear seat back frame assembly of an automobile; Figure 3 The invention is a welding assembly for a rear seat frame of an automobile Figure 2 A magnified view of the structure at center; Figure 4 The invention is a welding assembly for a rear seat frame of an automobile Figure 2A magnified view of the structure at B in the middle; Figure 5 It is a structural schematic diagram of a seat cushion frame assembly of a rear backrest seat frame welding assembly for an automobile according to the present invention; Figure 6 This is a structural schematic diagram of a reinforcement plate for a rear seat frame welding assembly of an automobile according to the present invention; Figure 7 This is a structural schematic diagram of an angle adjuster for a rear seat frame welding assembly of an automobile according to the present invention; Figure 8 The present invention is a flow chart of a welding method for a rear seat back frame welding assembly of an automobile.

[0019] In the figure: 1. Chair back frame assembly; 11. Side support plate; 12. Crossbeam; 13. Support tube; 14. Through hole; 15. Connecting tube; 2. Seat cushion frame assembly; 21. Bottom frame plate; 22. Support frame; 23. Fixed plate; 24. Fixed rod; 25. Limiting groove; 26. Positioning slot; 27. Reinforcement plate; 271. Connecting block; 272. Mounting screw hole; 3. Back plate; 31. Back support plate; 32. Crossbar; 33. Movable groove; 34. Connecting shaft; 35. Lumbar support plate; 36. Compression spring; 37. Limiting column; 4. Headrest; 41. Support rod; 5. Angle adjuster; 51. Connecting plate one; 52. Connecting plate two; 53. Volute spring; 54. Limiting plate one; 55. Limiting plate two; 56. Rotating shaft; 6. Fixed connecting plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Reference Figure 1 - Figure 7As shown: a welding assembly for a rear backrest seat frame of an automobile and a welding method thereof, comprising a seat back frame assembly 1, the bottom end of the seat back frame assembly 1 is movably connected to a seat cushion frame assembly 2, the top end of the seat back frame assembly 1 is fixedly connected to a headrest 4, the inner wall of the seat back frame assembly 1 is fixedly connected to a back plate 3, the outer wall of the back plate 3 is penetrated with a movable groove 33, the inner wall of the movable groove 33 is fixedly connected to a connecting shaft 34, the outer wall of the connecting shaft 34 is movably sleeved with a lumbar support plate 35, both sides of the lumbar support plate 35 are provided with back support plates 31, the bottom end of the back support plate 31 is fixedly connected to the outer wall of the connecting shaft 34, the top end of the back support plate 31 is fixedly connected to a cross bar 32, the two ends of the cross bar 32 are fixedly connected to the inner wall of the seat back frame assembly 1, the lower outer wall of the back plate 3 is fixedly connected to a limiting column 37, the outer wall of the limiting column 37 is movably sleeved with a compression spring 36, and the top of the compression spring 36 is fixedly connected to the outer wall of the lumbar support plate 35.

[0022] In this embodiment, the back support plate 31 and the cross bar 32 are connected to the chair back frame assembly 1, so that the present invention uses the two back support plates 31 to provide support for the upper part of the chair back frame assembly 1, thereby achieving effective support for the back of the occupant, and utilizing the rotation of the lumbar support plate 35 and the connecting shaft 34, in conjunction with the elastic contraction of the compression spring 36 between the lumbar support plate 35 and the back plate 3, so that the waist of the occupant is supported by the lumbar support plate 35, and the elastic deformation of the compression spring 36 can be used to adapt to the lumbar support force of the occupant to achieve adaptive angle force feedback, so that the present invention can provide excellent waist and back support and improve the comfort of the occupant.

[0023] Embodiment 2: Figure 2 , Figure 4 and Figure 7As shown, the chair back frame assembly 1 includes a side support plate 11, and the number of the side support plates 11 is provided with two, a cross beam 12 is fixedly connected between the top ends of the two side support plates 11, a support rod 41 is fixedly connected to the top surface of the cross beam 12, and the top of the support rod 41 is fixedly connected to the bottom surface of the headrest 4, and a support tube 13 is fixedly connected between the bottom ends of the two side support plates 11, one end of the support tube 13 passes through the outer wall of the side support plate 11 and is rotatably connected to the fixed connecting plate 6, and the outer wall of the fixed connecting plate 6 is fixedly connected to a connecting tube 15, the interior of the connecting tube 15 is connected to the interior of the supporting tube 13, and a through hole 14 is opened through the outer wall of the supporting tube 13, and the other end of the support tube 13 passes through the outer wall of the side support plate 11 and is connected The angle adjuster 5 comprises a connecting plate 1 51 and a connecting plate 2 52. A rotating shaft 56 is rotatably connected to the outer wall of the connecting plate 2 52. One end of the rotating shaft 56 is fixedly connected to the outer wall of the connecting plate 1 51. The other end of the rotating shaft 56 is fixedly connected to one end of the support tube 13. The upper outer wall of the connecting plate 2 52 is fixedly connected to a limiting plate 1 54. A spiral spring 53 is sleeved on the outside of the limiting plate 1 54. The inner end of the spiral spring 53 is fixedly connected to the outer wall of the limiting plate 1 54. The outer end of the spiral spring 53 is fixedly connected to the limiting plate 2 55. One end of the limiting plate 2 55 is fixedly connected to the outer wall of the connecting plate 1 51. The top of the connecting plate 1 51 is fixedly connected to the outer wall of the side support plate 11.

[0024] In this embodiment, the structural stability of the top of the seat back frame assembly 1 is improved by welding the cross beam 12 and the side support plate 11. The seat back frame assembly 1 is connected to the seat cushion frame assembly 2 by setting the angle adjuster 5 and the fixed connecting plate 6. The two ends of the support tube 13 are respectively rotatably arranged with the angle adjuster 5 and the fixed connecting plate 6, so that when the user applies pressure to adjust the angle of the seat back frame assembly 1, the side support plate 11 drives the support tube 13 to rotate synchronously, thereby driving the limit plate 2 55 through the rotating shaft 56 and the connecting plate 1 51. The spiral spring 53 is expanded or contracted, and the elastic deformation of the spiral spring 53 allows the user to quickly rebound and reset the seat back frame assembly 1 after releasing the pressure, so that the user can quickly adjust the angle between the seat back frame assembly 1 and the seat cushion frame assembly 2. Through the arrangement of the support tube 13, the through hole 14 and the connecting tube 15, the present invention can be connected to the connecting tube 15 through an external air pump, and the inside of the side support plate 11 can be ventilated through the through hole 14, so as to avoid long-term contact of the passengers causing stuffiness and sweating, thereby further improving comfort.

[0025] Embodiment 3: According to Figure 5 and Figure 6As shown, the seat cushion frame assembly 2 includes a bottom frame plate 21, a support frame 22, a fixing plate 23 and a fixing rod 24. The outer walls on both sides of the bottom frame plate 21 are provided with limiting grooves 25. The two ends of the fixing rod 24 are movably connected to the inner walls of the limiting grooves 25. The two ends of the fixing rod 24 are fixedly connected to the outer wall of the fixing plate 23. The outer wall of the fixing plate 23 is fixedly connected to the outer wall of the support frame 22. A positioning slot 26 is penetrated through the top surface of the support frame 22. The inner wall of the positioning slot 26 is fixedly connected with a connecting block 271. The bottom end of the connecting block 271 is fixedly connected with a reinforcing plate 27. The outer wall of the reinforcing plate 27 is penetrated with a mounting screw hole 272.

[0026] In this embodiment, the setting of the limit groove 25 allows the support frame 22 and the fixing plate 23 to be quickly positioned when they are welded and fixed, and the fixing rod 24 is used to fix the two fixing plates 23. The setting of the bottom frame plate 21 and the support frame 22 realizes the upper and lower separation, which is convenient for the subsequent seat cushion frame assembly 2 to be connected and fixed to the seat cushion and the installation position in the vehicle, respectively, and is convenient for operators to quickly install and improve the installation efficiency of the present invention. The setting of the reinforcing plate 27 improves the strength of the center of the top surface of the seat cushion frame assembly 2, making the present invention less likely to deform when riding and providing stable support.

[0027] Embodiment 4: This embodiment provides a welding method for a rear seat frame assembly of an automobile, comprising the following steps: Step 1: First, place the components of the seat back frame assembly 1 and the seat cushion frame assembly 2 on the welding platform, and position and fix them with a clamp. Position each part reasonably to ensure that they are in the correct relative position, and fix them with a clamp to prevent displacement during welding; Step 2: Preset welding parameters and preheat the area to be welded to ensure uniform temperature in the welding area. Presetting welding parameters and preheating can significantly improve welding quality and reliability and reduce the occurrence of defects and failures. The preheating temperature is 280℃-400℃, and the preheating method is infrared heater heating; Step 3: Weld the top ends of the two side support plates 11 to the two ends of the cross beam 12, weld the two ends of the support tube 13 to the bottom ends of the side support plates 11, and weld the back plate 3 and its attached back support plate 31 and the cross bar 32 to the side support plates 11 in turn; Step 4: Weld and fix the angle adjuster 5 and the fixed connecting plate 6 to the connection between the seat back frame assembly 1 and the seat cushion frame assembly 2 respectively, and finally weld and fix the seat cushion frame assembly 2 in sequence; Step 5: After welding, let the welded part cool naturally, and check and correct it to ensure that the weld quality meets the requirements. Avoid welding deformation caused by rapid cooling through natural cooling. Among them, the inspection includes appearance, welding depth and weld strength as well as non-destructive testing, which can effectively improve welding quality and reduce safety hazards caused by welding defects; Step 6. Deburr and polish the welding parts to ensure a smooth surface, and perform rust-proof treatment on the welding parts.

[0028] The method of use and working principle of the device are as follows: the back support plate 31 and the cross bar 32 are connected to the seat back frame assembly 1, so that the present invention uses the two back support plates 31 to provide support for the upper part of the seat back frame assembly 1, and uses the rotation of the lumbar support plate 35 and the connecting shaft 34 to cooperate with the elastic contraction of the compression spring 36 between the lumbar support plate 35 and the back plate 3, so that the waist of the occupant is supported by the lumbar support plate 35, and the elastic deformation of the compression spring 36 can be used to adapt to the waist support force of the occupant to achieve adaptive angle force feedback, and the structural stability of the top of the seat back frame assembly 1 is improved by welding the cross beam 12 and the side support plate 11, and the seat back frame assembly 1 is connected to the seat cushion frame assembly 2 by the setting of the angle adjuster 5 and the fixed connecting plate 6, and the two ends of the support tube 13 are respectively rotated with the angle adjuster 5 and the fixed connecting plate 6, so that the user can apply pressure When adjusting the angle of the seat back frame assembly 1, the side support plate 11 drives the support tube 13 to rotate synchronously, thereby driving the limit plate 2 55 through the rotating shaft 56 and the connecting plate 1 51 to expand or contract the spiral spring 53. The elastic deformation of the spiral spring 53 allows the user to quickly rebound and reset the seat back frame assembly 1 after releasing the pressure. Through the arrangement of the support tube 13, the through hole 14 and the connecting tube 15, the present invention can be connected to the connecting tube 15 through an external air pump, and the ventilation inside the side support plate 11 is achieved through the through hole 14. Through the arrangement of the limit groove 25, the support frame 22 and the fixing plate 23 can be quickly positioned when welded and fixed. The fixing rod 24 is used to fix the two fixing plates 23. Through the arrangement of the bottom frame plate 21 and the support frame 22, the upper and lower separation is realized, which is convenient for the subsequent seat cushion frame assembly 2 to be connected and fixed to the seat cushion and the installation position in the vehicle respectively.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding assembly for a rear seat back frame of an automobile, comprising a seat back frame assembly (1), characterized in that: The bottom end of the chair back frame assembly (1) is movably connected to the seat cushion frame assembly (2), the top end of the chair back frame assembly (1) is fixedly connected to the headrest (4), the inner wall of the chair back frame assembly (1) is fixedly connected to the back plate (3), the outer wall of the back plate (3) is penetrated by a movable groove (33), the inner wall of the movable groove (33) is fixedly connected to a connecting shaft (34), the outer wall of the connecting shaft (34) is movably sleeved with a lumbar support plate (35), and both sides of the lumbar support plate (35) are provided with A back support plate (31), the bottom end of the back support plate (31) is fixedly connected to the outer wall of the connecting shaft (34), the top end of the back support plate (31) is fixedly connected to a cross bar (32), the two ends of the cross bar (32) are fixedly connected to the inner wall of the chair back frame assembly (1), the lower outer wall of the back plate (3) is fixedly connected to a limiting column (37), the outer wall of the limiting column (37) is movably sleeved with a compression spring (36), and the top end of the compression spring (36) is fixedly connected to the outer wall of the lumbar support plate (35).

2. The welding assembly for a rear seat frame of an automobile according to claim 1, characterized in that: The seat back frame assembly (1) comprises a side support plate (11), wherein two side support plates (11) are provided, a cross beam (12) is fixedly connected between the top ends of the two side support plates (11), a support rod (41) is fixedly connected to the top surface of the cross beam (12), and the top end of the support rod (41) is fixedly connected to the bottom surface of the headrest (4).

3. The welding assembly for a rear seat frame of an automobile according to claim 2, characterized in that: A support tube (13) is fixedly connected between the bottom ends of the two side support plates (11); one end of the support tube (13) passes through the outer wall of the side support plate (11) and is rotatably connected to a fixed connecting plate (6); a connecting tube (15) is fixedly connected to the outer wall of the fixed connecting plate (6); the interior of the connecting tube (15) is connected to the interior of the support tube (13); and a through hole (14) is formed through the outer wall of the support tube (13).

4. The welding assembly for a rear seat frame of an automobile according to claim 3, characterized in that: The other end of the support tube (13) passes through the outer wall of the side support plate (11) and is connected to an angle adjuster (5); the angle adjuster (5) comprises a first connecting plate (51) and a second connecting plate (52); a rotating shaft (56) passes through the outer wall of the second connecting plate (52) and is rotatably connected thereto; one end of the rotating shaft (56) is fixedly connected to the outer wall of the first connecting plate (51); and the other end of the rotating shaft (56) is fixedly connected to one end of the support tube (13).

5. The welding assembly for a rear seat frame of an automobile according to claim 4, characterized in that: The upper outer wall of the connecting plate 2 (52) is fixedly connected to the limiting plate 1 (54); the outer portion of the limiting plate 1 (54) is sleeved with a spiral spring (53); the inner end of the spiral spring (53) is fixedly connected to the outer wall of the limiting plate 1 (54); the outer end of the spiral spring (53) is fixedly connected to the limiting plate 2 (55); one end of the limiting plate 2 (55) is fixedly connected to the outer wall of the connecting plate 1 (51); and the top of the connecting plate 1 (51) is fixedly connected to the outer wall of the side support plate (11).

6. The welding assembly for a rear seat frame of an automobile according to claim 1, characterized in that: The seat cushion frame assembly (2) comprises a bottom frame plate (21), a support frame (22), a fixing plate (23) and a fixing rod (24); both sides of the bottom frame plate (21) are provided with limiting grooves (25) on their outer walls; both ends of the fixing rod (24) are movably connected to the inner walls of the limiting grooves (25); both ends of the fixing rod (24) are fixedly connected to the outer wall of the fixing plate (23); and the outer wall of the fixing plate (23) is fixedly connected to the outer wall of the support frame (22).

7. The welding assembly for a rear seat frame of an automobile according to claim 6, characterized in that: A positioning slot (26) is provided through the top surface of the support frame (22); a connecting block (271) is fixedly connected to the inner wall of the positioning slot (26); a reinforcing plate (27) is fixedly connected to the bottom end of the connecting block (271); and a mounting screw hole (272) is provided through the outer wall of the reinforcing plate (27).

8. A welding method for a rear seat frame assembly of an automobile, characterized in that: The use of a welding assembly for a rear seat frame of an automobile as claimed in any one of claims 1 to 7 comprises the following steps: S1. First, the seat back frame assembly (1) and the seat cushion frame assembly (2) are placed on a welding platform and positioned and fixed by a clamp; S2. Preset welding parameters and preheat the area to be welded to ensure uniform temperature in the welding area; S3, welding and fixing the top ends of the two side support plates (11) to the two ends of the cross beam (12), welding the two ends of the support tube (13) to the bottom ends of the side support plates (11), and sequentially welding and fixing the back plate (3) and its attached back support plate (31) and the cross bar (32) to the side support plates (11); S4, respectively welding and fixing the angle adjuster (5) and the fixed connecting plate (6) to the connection between the seat back frame assembly (1) and the seat cushion frame assembly (2), and finally welding and fixing the seat cushion frame assembly (2) in sequence; S5. After welding is completed, let the welded part cool naturally, and check and correct it to ensure that the weld quality meets the requirements; S6. Deburr and grind the welding parts to ensure a smooth surface, and perform rust-proof treatment on the welding parts.

9. A welding method for a rear seat frame assembly of an automobile according to claim 8, characterized in that: In step S2, the preheating treatment temperature is 280°C-400°C, and the preheating method is heating with an infrared heater.

10. A welding method for a rear seat frame assembly of an automobile according to claim 8, characterized in that: In step S5, the inspection includes appearance, welding depth and weld strength as well as non-destructive testing.

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