Front floor assembly welding method

Abstract

This disclosure relates to a welding method for a front floor assembly, belonging to the field of automotive manufacturing technology. The welding method includes loading the front seat rear crossbeam assembly and other structural components of the front floor assembly together, and then joining them to the front floor body at a laser welding station. At the laser welding station, the front seat rear crossbeam assembly is welded to the front floor body using laser deep penetration welding. Simultaneously, the front floor body and other structural components in the front floor assembly are welded together at multiple laser pre-welding points to form a first pre-welded component. A robotic arm picks up the first pre-welded component and moves it to a spot welding station, where spot welding is performed between the front floor body and other structural components of the front floor assembly. Simultaneously, the first laser deep penetration weld is covered and sealed using spot welding. This disclosure reduces the number of loading operations for welding the front floor assembly and ensures the water-resistant sealing performance of the front floor assembly.

Description

Technical Field

[0001] This disclosure relates to the field of automotive manufacturing technology, and in particular to a welding method for a front floor assembly. Background Technology

[0002] The front floor assembly of a pure electric vehicle typically houses an integrated battery pack, which mainly consists of the front floor body, the rear front floor body, the front seat front crossbeam assembly, the front longitudinal beam cover, the battery pack mounting bracket and the central channel connecting plate, the airbag ECU (Electronic Control Unit) mounting plate, and the front seat rear crossbeam assembly, etc.

[0003] In existing technology, the front seat rear crossbeam assembly uses a roll-formed structure and needs to be connected to the front floor assembly via laser welding. However, the front floor assembly is a sealing component and needs to ensure its water-tight sealing performance. Because the front floor body is relatively thin, it is prone to breakdown after laser welding with other components. While measures such as changing the laser welding shape and modifying the clamps for compression compensation can be taken, the breakdown problem cannot be completely eliminated. Therefore, spot welding is typically used to connect the front floor body to other structural components in the front floor assembly.

[0004] This requires setting up two separate loading ports on the production line, and equipping each loading port with a set of positioning fixtures. Manual loading is required when the front floor body is connected to the front seat rear crossbeam body of the front seat rear crossbeam assembly, and when the front floor body is connected to other components in the front floor assembly. This not only complicates the process, but also greatly increases equipment and labor costs. Summary of the Invention

[0005] Therefore, this disclosure provides a welding method for a front floor assembly, which can reduce the number of material loading operations for welding the front floor assembly and ensure the water-sealing performance of the front floor assembly. The technical solution is as follows:

[0006] The welding method for the front floor assembly includes the following steps:

[0007] Step a includes: mounting the front floor body, the front seat rear crossbeam assembly, the battery front mounting bracket assembly, the airbag ECU mounting plate assembly, the front seat front crossbeam assembly, the front longitudinal beam upper cover plate and the center channel connecting plate assembly onto the laser welding station and assembling them together, and positioning them using the first fixture of the laser welding station;

[0008] Step b includes: welding the overlapping parts of the front seat rear crossbeam assembly and the front floor body together by laser deep penetration welding, and welding the overlapping parts of the battery front mounting bracket assembly, the airbag ECU mounting plate assembly, the front seat front crossbeam assembly, the front longitudinal beam upper cover plate and the center channel connecting plate assembly to the front floor body at multiple laser pre-welding points by laser deep penetration welding to form a first pre-welded part;

[0009] Step c includes: releasing the first clamp, gripping the first pre-welded part to the spot welding station by a robotic arm, and positioning it by the second clamp of the spot welding station. Then, spot welding the overlapping parts between the battery front mounting bracket assembly, the airbag ECU mounting plate assembly, the front seat front crossbeam assembly, the front longitudinal beam upper cover plate, and the center channel connecting plate assembly and the front floor body together. In this way, the first laser deep penetration weld seam welded by laser deep penetration welding on the laser pre-welded point is covered and sealed by spot welding to form the front floor assembly.

[0010] In one possible implementation, in step b, the first laser deep penetration weld is a cross-shaped weld.

[0011] In one possible implementation, the transverse and longitudinal welds in the cross-shaped weld are connected to each other at their respective center positions.

[0012] In one possible implementation, the transverse and longitudinal weld lengths in the cross-shaped weld are equal.

[0013] In one possible implementation, the lengths of both the transverse and longitudinal welds in the cross-shaped weld are 3mm to 5mm.

[0014] In one possible implementation, in step c, the diameter of the spot weld covering surface for sealing the first laser deep penetration weld is 5mm to 7mm.

[0015] In one possible implementation, the front floor assembly further includes a rear front floor body, and the welding method for the front floor assembly further includes the following steps:

[0016] Step d includes: welding the front floor body and the rear front floor body together by spot welding to form a first front floor sub-assembly.

[0017] In one possible implementation, the spot welding station includes a first spot welding station and a second spot welding station, the first spot welding station having a third fixture, the second spot welding station having a second fixture, and step d preceding step a;

[0018] Step d further includes: feeding the front floor body and the rear front floor body together through the first loading port to the first spot welding station and overlapping them together, and after positioning them by the third clamp, spot welding the overlapping parts of the front floor body and the rear front floor body together to form the first front floor sub-assembly.

[0019] Step a further includes: feeding the front seat rear crossbeam assembly, the battery front mounting bracket assembly, the airbag ECU mounting plate assembly, the front seat front crossbeam assembly, the front longitudinal beam upper cover plate and the center channel connecting plate assembly to the laser welding station through the second loading port to form the second front floor sub-assembly; releasing the third clamp; and then picking up the first front floor sub-assembly from the first spot welding station to the laser welding station by a robotic arm, so that the front floor body and the second front floor sub-assembly overlap together and are positioned by the first clamp.

[0020] Step c further includes: after releasing the first clamp, the first pre-welded part with the rear body of the front floor is picked up by a robotic arm and placed at the second spot welding station, and positioned by the second clamp.

[0021] In one possible implementation, step c further includes: grabbing the first pre-welded component to the spot welding station by a robotic arm, and then loading the rear body of the front floor into the spot welding station through the third loading port and overlapping it with the front floor body. Then, positioning the first pre-welded component and the rear body of the front floor by a second clamp, and then spot welding the front floor body and the rear body of the front floor together at the spot welding station.

[0022] In one possible implementation, each structural component has multiple laser pre-welded points at the point where it overlaps with the front floor body, and the multiple laser pre-welded points are respectively located on opposite sides of the corresponding structural component.

[0023] The structural component is one of the following: the battery front mounting bracket assembly, the airbag ECU mounting plate assembly, the front seat front crossbeam assembly, the front longitudinal beam upper cover plate, and the center channel connecting plate assembly.

[0024] In the solution disclosed herein, the front seat rear crossbeam assembly and other structural components of the front floor assembly are fed together and overlapped with the front floor body at the laser welding station. This eliminates the need for separate feeding ports for the front seat rear crossbeam assembly and other structural components of the front floor assembly. At the laser welding station, the front seat rear crossbeam assembly and the front floor body are welded together using laser deep penetration welding. Simultaneously, the front floor body and other structural components of the front floor assembly are welded together at multiple laser pre-welding points, forming a first pre-welded component that is integrated with the front floor body, the front seat rear crossbeam assembly, and other structural components of the front floor assembly at the laser welding station. This first pre-welded component can then be gripped by a robotic arm and moved to the spot welding station. Spot welding is then performed at the spot welding station to complete the welding between the front floor body and other structural components of the front floor assembly, while simultaneously sealing the first laser deep penetration weld seam formed by the laser deep penetration welding at the laser pre-welding points. This reduces the number of times the front floor assembly needs to be loaded during welding and ensures the water-sealing performance of the front floor assembly. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the first type of front floor assembly provided in this embodiment of the disclosure;

[0027] Figure 2 This is a schematic diagram of the split structure of a first front floor sub-assembly provided in an embodiment of this disclosure;

[0028] Figure 3 This is a schematic diagram of the split structure of a second front floor sub-assembly provided in an embodiment of the present disclosure;

[0029] Figure 4 This is a schematic diagram of the structure of the second type of front floor assembly provided in this embodiment of the present disclosure;

[0030] Figure 5 This is a schematic diagram of a battery front mounting bracket assembly provided in an embodiment of this disclosure;

[0031] Figure 6 This is a schematic diagram of the structure of an airbag ECU mounting plate assembly provided in an embodiment of this disclosure;

[0032] Figure 7 This is a structural schematic diagram of a front seat front crossbeam assembly provided in an embodiment of this disclosure;

[0033] Figure 8 This is a schematic diagram of the structure of a front longitudinal beam upper cover plate provided in an embodiment of this disclosure;

[0034] Figure 9 This is a schematic diagram of the structure of a middle channel connecting plate assembly provided in an embodiment of this disclosure;

[0035] Figure 10 This is a schematic flowchart of the first front floor assembly welding method provided in the embodiments of this disclosure;

[0036] Figure 11 This is a schematic flowchart of the second front floor assembly welding method provided in the embodiments of this disclosure;

[0037] Figure 12 This is a schematic flowchart of the third front floor assembly welding method provided in the embodiments of this disclosure.

[0038] Explanation of reference numerals in the attached figures

[0039] 100. First front floor assembly; 200. Second front floor assembly.

[0040] 101. Front floor body; 102. Rear front floor body; 1. Laser pre-welded point; 2. Rear crossbeam assembly of front seat; 3. Battery front center mounting bracket assembly; 4. Airbag ECU mounting plate assembly; 5. Front crossbeam assembly of front seat; 6. Front longitudinal beam upper cover plate; 7. Center channel connecting plate assembly. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0042] This embodiment relates to a welding method for a front floor assembly, such as... Figure 1 The diagram shown is a structural schematic of the first type of front floor assembly. Figure 2 The diagram shown is a split structural diagram of the first front floor sub-assembly. Figure 3 The diagram shown is a split structural diagram of the second front floor sub-assembly. Figure 4 The diagram shown is a structural schematic of the second type of front floor assembly. Figure 5 The diagram shows a schematic of the mounting bracket assembly at the front of the battery. Figure 6 The diagram shown is a structural schematic of the airbag ECU mounting plate assembly. Figure 7 The diagram shown is a structural schematic of the front seat front crossbeam assembly. Figure 8 The diagram shown is a structural schematic of the upper cover plate of the front longitudinal beam. Figure 9 The diagram shown is a structural schematic of the middle channel connecting plate assembly. Figure 10 The diagram shown is a flowchart of the first method for welding the front floor assembly. Figure 11 The diagram shows a flow chart of the second front floor assembly welding method. Figure 12 The diagram shows a flow chart of the third front floor assembly welding method.

[0043] refer to Figure 9 As shown, the welding method for the front floor assembly includes the following steps:

[0044] Step a includes: loading the front floor body 101, the front seat rear crossbeam assembly 2, the battery front mounting bracket assembly 3, the airbag ECU mounting plate assembly 4, the front seat front crossbeam assembly 5, the front longitudinal beam upper cover plate 6, and the center channel connecting plate assembly 7 onto the laser welding station for overlapping, and positioning them using the first fixture at the laser welding station. For example, the front floor body 101, the front seat rear crossbeam assembly 2, the battery front mounting bracket assembly 3, the airbag ECU mounting plate assembly 4, the front seat front crossbeam assembly 5, the front longitudinal beam upper cover plate 6, and the center channel connecting plate assembly 7 can be manually loaded onto the laser welding station. This avoids the need for separate loading of other structural components in the front seat rear crossbeam assembly 2 and the front floor assembly at two different loading ports.

[0045] The front floor assembly is a sheet metal structure assembly located between the front compartment assembly and the rear floor assembly in the lower body sheet metal structure, used to support the driver and front passenger. The number, shape, and position of the following components in the front floor assembly may vary depending on the type of vehicle: the front floor body 101, the front seat rear crossbeam assembly 2, the battery front mounting bracket assembly 3, the airbag ECU mounting plate assembly 4, the front seat front crossbeam assembly 5, the front longitudinal beam upper cover 6, and the center tunnel connecting plate assembly 7. The following will use... Figure 1 The example shown is an example.

[0046] refer to Figure 1 As shown, the front floor body 101 can be one, the front seat rear crossbeam assembly 2 can be one, the battery front mounting bracket assembly 3 can be four, the airbag ECU mounting plate assembly 4 can be one, the front seat front crossbeam assembly 5 can be one, the front longitudinal beam upper cover plate 6 can be two, and the center channel connecting plate assembly 7 can be one.

[0047] The outer contour of the front floor body 101 can be rectangular, the outer contour of the front seat rear crossbeam assembly 2 can be strip-shaped, the outer contour of the battery front mounting bracket assembly 3 can be strip-shaped, the outer contour of the airbag ECU mounting plate assembly 4 can be rectangular, the outer contour of the front seat front crossbeam assembly 5 can be strip-shaped, the outer contour of the front longitudinal beam upper cover 6 can be strip-shaped, and the outer contour of the center channel connecting plate assembly 7 can be a rectangular shape with a U-shaped opening on one side.

[0048] Among them, continue to refer to Figure 1As shown, the front seat rear crossbeam assembly 2, the battery front center mounting bracket assembly 3, the airbag ECU mounting plate assembly 4, the front seat front crossbeam assembly 5, the front longitudinal beam upper cover plate 6, and the center channel connecting plate assembly 7 are all located on the mounting surface of the front floor body 101 and overlap with the mounting surface of the front floor body 101 respectively.

[0049] Furthermore, the rear crossbeam assembly 2 of the front seat can be located at the rear end of the front floor body 101, and the rear crossbeam assembly 2 of the front seat can be parallel to the rear side of the front floor body 101. The front crossbeam assembly 5 of the front seat can be located in the middle of the front floor body 101, and the front crossbeam assembly 5 of the front seat can be parallel to the rear crossbeam assembly 2 of the front seat. Both the rear crossbeam assembly 2 of the front seat and the front crossbeam assembly 5 of the front seat can be flush with the left and right sides of the front floor body 101 at their respective ends.

[0050] The four battery front mounting bracket assemblies 3 and the airbag ECU mounting plate assembly 4 can all be located between the front seat rear crossbeam assembly 2 and the front seat front crossbeam assembly 5. The four battery front mounting bracket assemblies 3 can all be perpendicular to the front seat rear crossbeam assembly 2, and the rear side of the airbag ECU mounting plate assembly 4 can be parallel to the front seat rear crossbeam assembly 2. The four battery front mounting bracket assemblies 3 and the airbag ECU mounting plate assembly 4 can be arranged sequentially along the length of the front seat rear crossbeam assembly 2, and the four battery front mounting bracket assemblies 3 can be located in pairs on the left and right sides of the airbag ECU mounting plate assembly 4.

[0051] Both the front longitudinal beam cover plate 6 and the center channel connecting plate assembly 7 can be located on the side of the front seat front crossbeam assembly 5 away from the front seat rear crossbeam assembly 2. Both front longitudinal beam cover plates 6 can be perpendicular to the front seat front crossbeam assembly 5, and the rear side of the center channel connecting plate assembly 7 opposite to the U-shaped opening can be parallel to the front seat front crossbeam assembly 5. The two front longitudinal beam cover plates 6 and the center channel connecting plate assembly 7 can be arranged sequentially along the length of the front seat front crossbeam assembly 5, and the two front longitudinal beam cover plates 6 are located on the left and right sides of the center channel connecting plate assembly 7, respectively.

[0052] The two ends of the center channel connecting plate assembly 7 can respectively overlap the rear side of the front seat front crossbeam assembly 5 and the front side of the front seat rear crossbeam assembly 2. The front and rear sides of the airbag ECU mounting plate assembly 4 can respectively overlap the rear side of the front seat front crossbeam assembly 5 and the front side of the front seat rear crossbeam assembly 2. The rear end of the front longitudinal beam cover plate 6 can overlap the front side of the front seat front crossbeam assembly 5, and the front end can extend from the front side of the front floor body 101. The rear side of the center channel connecting plate assembly 7 can overlap the front side of the front seat front crossbeam assembly 5, and the two ends of the U-shaped opening can extend from the front side of the front floor body 101.

[0053] Step b includes: welding the overlapping parts of the front seat rear crossbeam assembly 2 and the front floor body 101 together by laser deep penetration welding, and welding the overlapping parts of the battery front mounting bracket assembly 3, airbag ECU mounting plate assembly 4, front seat front crossbeam assembly 5, front longitudinal beam upper cover plate 6 and center channel connecting plate assembly 7 with the front floor body 101 together by laser deep penetration welding at multiple laser pre-welding points 1 to form a first pre-welded part.

[0054] Since the cross section of the front seat rear crossbeam assembly 2 is usually a H-shaped structure, the front seat rear crossbeam assembly 2 and the front floor body 101 can be directly welded together at their overlapping parts by laser deep penetration welding.

[0055] For example, the second laser deep penetration weld between the front seat rear crossbeam assembly 2 and the front floor body 101, formed by laser deep penetration welding, can be "straight," "C-shaped," or "Z-shaped." In this embodiment, the second laser deep penetration weld between the front seat rear crossbeam assembly 2 and the front floor body 101 can be "straight," which results in faster welding speed and better connection after welding.

[0056] Because the battery front mounting bracket assembly 3, airbag ECU mounting plate assembly 4, front seat front crossbeam assembly 5, front longitudinal beam upper cover plate 6, and center channel connecting plate assembly 7 are all relatively thin, laser deep penetration welding is highly likely to cause breakdown problems when welding the parts where these components overlap with the front floor body 101.

[0057] Therefore, the battery front mounting bracket assembly 3, airbag ECU mounting plate assembly 4, front seat front crossbeam assembly 5, front longitudinal beam upper cover plate 6, and center channel connecting plate assembly 7 are welded together with the front floor body 101 at multiple laser pre-welding points 1 by laser deep penetration welding. This makes the battery front mounting bracket assembly 3, airbag ECU mounting plate assembly 4, front seat front crossbeam assembly 5, front longitudinal beam upper cover plate 6, and center channel connecting plate assembly 7 fixedly connected to the front floor body 101, forming the first pre-welded part.

[0058] Step c includes: releasing the first clamp, grabbing the first pre-welded part to the spot welding station by the robotic arm, and positioning it by the second clamp of the spot welding station. Then, the overlapping parts between the battery front mounting bracket assembly 3, the airbag ECU mounting plate assembly 4, the front seat front crossbeam assembly 5, the front longitudinal beam upper cover plate 6, and the center channel connecting plate assembly 7 and the front floor body 101 are spot welded together. In this process, the first laser deep penetration weld seam welded by laser deep penetration welding on the laser pre-welded point 1 is covered and sealed by spot welding to form the front floor assembly.

[0059] During laser welding, the battery front mounting bracket assembly 3, airbag ECU mounting plate assembly 4, front seat front crossbeam assembly 5, front longitudinal beam upper cover plate 6, and center channel connecting plate assembly 7 are fixedly connected to the front floor body 101, forming the first pre-welded component. Therefore, the robotic arm can directly grasp the first pre-welded component as a whole and place it at the spot welding station.

[0060] At the spot welding station, on the one hand, the battery front mounting bracket assembly 3, airbag ECU mounting plate assembly 4, front seat front crossbeam assembly 5, front longitudinal beam upper cover plate 6 and center channel connecting plate assembly 7 can be completely welded together with the front floor body 101 by spot welding. On the other hand, the first laser deep penetration weld seam that has been welded by laser deep penetration welding on the laser pre-welded point 1 can be covered and sealed by spot welding.

[0061] As can be seen from the above, by feeding the front seat rear crossbeam assembly 2 and other structural components in the front floor assembly together and joining them with the front floor body 101 at the laser welding station, it is possible to eliminate the need to feed the front seat rear crossbeam assembly 2 and other structural components in the front floor assembly separately at two feeding ports.

[0062] At the laser welding station, the front seat rear crossbeam assembly 2 and the front floor body 101 are welded together using laser deep penetration welding. Simultaneously, the front floor body 101 and other structural components in the front floor assembly are welded together at multiple laser pre-welding points 1, forming a first pre-welded component at the laser welding station. This first pre-welded component can then be picked up by a robotic arm and moved to the spot welding station.

[0063] At the spot welding station, the welding between the front floor body 101 and other structural components in the front floor assembly is completed by spot welding. At the same time, the first laser deep penetration weld of the laser pre-welded point 1 is covered and sealed by spot welding.

[0064] This reduces the number of times the front floor assembly needs to be loaded during welding and ensures the water-sealing performance of the front floor assembly.

[0065] In one example, during loading, the front seat rear crossbeam assembly 2, the battery front mounting bracket assembly 3, the airbag ECU mounting plate assembly 4, the front seat front crossbeam assembly 5, the front longitudinal beam upper cover plate 6, and the center channel connecting plate assembly 7 are first placed in the correct position on the first fixture of the laser welding station, forming a structure as shown below. Figure 4 The second front floor sub-assembly 200 is shown, and then the mounting surface of the front floor body 101 is placed on top of the second front floor sub-assembly 200. In this way, after the second front floor sub-assembly 200 and the front floor body 101 are positioned by the first clamp, the accuracy of the connection position between the second front floor sub-assembly 200 and the front floor body 101 can be ensured, avoiding misalignment or displacement, which would affect the performance of the front floor assembly after welding.

[0066] In one example, reference Figures 4 to 8 As shown, to facilitate subsequent sealing via spot welding, the first laser deep penetration weld in step b is a cross-shaped weld. This reduces the difficulty of sealing the first laser deep penetration weld via spot welding, making it easier to achieve a seal and resulting in a better sealing effect, thus avoiding any impact on the water-sealing performance of the front floor assembly.

[0067] In one example, continue to refer to Figures 4 to 8 As shown, the transverse and longitudinal welds in the cross-shaped weld are connected to each other at their center positions. This reduces the difficulty of sealing the first laser deep penetration weld by spot welding, making it easier to achieve a seal and resulting in a better sealing effect, thus avoiding any impact on the water sealing performance of the front floor assembly.

[0068] In one example, continue to refer to Figures 4 to 8 As shown, the transverse and longitudinal weld lengths in the cross-shaped weld are equal. This reduces the difficulty of sealing the first laser deep penetration weld by spot welding, making it easier to achieve a seal and resulting in a better sealing effect, thus avoiding any impact on the water-sealing performance of the front floor assembly.

[0069] In one example, the lengths of both the transverse and longitudinal welds in a cross-shaped weld are 3mm to 5mm. For instance, the lengths of both the transverse and longitudinal welds can be 3mm, 4mm, or 5mm.

[0070] Therefore, on the one hand, it avoids the first laser deep penetration weld being too small, which would affect the firmness of the laser deep penetration weld between the front floor body 101 and other structural components in the front floor assembly at the laser pre-weld point 1, potentially causing separation between the other structural components in the front floor assembly and the front floor body 101. On the other hand, it avoids the first laser deep penetration weld being too large, making it difficult to cover and seal the first laser deep penetration weld by spot welding, thus affecting the water-sealing performance of the front floor assembly.

[0071] In one example, in step c, the diameter of the spot weld covering surface for sealing the first laser deep penetration weld is 5mm to 7mm. For example, the diameter of the spot weld covering surface can be 5mm, 6mm, or 7mm. This ensures that the spot weld covering surface completely covers the first laser deep penetration weld, thereby guaranteeing the water-sealing performance of the front floor assembly.

[0072] In one example, the front floor assembly also includes a rear front floor body 102, and the welding method for the front floor assembly further includes the following steps:

[0073] Step d includes: welding the front floor body 101 and the rear front floor body 102 together by spot welding to form a shape as shown in the figure. Figure 2 The first front floor assembly 100 is shown.

[0074] Therefore, when the processing material area is not large enough, the first front floor sub-assembly 100 is formed by the front floor body 101 and the rear front floor body 102, which can ensure the water-sealing performance of the front floor assembly.

[0075] In one example, reference Figure 11 As shown, in order to reduce the number of welding operations for the front floor assembly while ensuring its water-sealing performance, the front floor assembly includes the rear body 102 of the front floor. The spot welding station includes a first spot welding station and a second spot welding station. The first spot welding station has a third fixture, and the second spot welding station has a second fixture. Step d is performed before step a.

[0076] Step d further includes: feeding the front floor body 101 and the rear front floor body 102 together through the first loading port to the first spot welding station and overlapping them, and then positioning them with the third clamp, and then spot welding the overlapping parts of the front floor body 101 and the rear front floor body 102 together to form the first front floor sub-assembly 100. For example, the rear side of the front floor body 101 is overlapped with the front side of the rear front floor body 102 and then spot welded together.

[0077] Step a further includes: feeding the front seat rear crossbeam assembly 2, the battery front mounting bracket assembly 3, the airbag ECU mounting plate assembly 4, the front seat front crossbeam assembly 5, the front longitudinal beam upper cover plate 6, and the center channel connecting plate assembly 7 to the laser welding station through the second loading port to form the second front floor sub-assembly 200. Then, releasing the third clamp, and then using a robotic arm to grab the first front floor sub-assembly 100 from the first spot welding station to the laser welding station, so that the front floor body 101 and the second front floor sub-assembly 200 are joined together and positioned by the first clamp.

[0078] Step c further includes: after releasing the first clamp, the first pre-welded part with the front floor rear body 102 is picked up by the robotic arm and placed at the second spot welding station, and positioned by the second clamp.

[0079] In one example, reference Figure 12 As shown, step c further includes: grabbing the first pre-welded part to the spot welding station by a robotic arm, and then loading the rear body 102 of the front floor into the spot welding station through the third loading port and overlapping it with the front floor body 101. Then, the first pre-welded part and the rear body 102 of the front floor are positioned by the second clamp, and the front floor body 101 and the rear body 102 of the front floor are welded together by spot welding at the spot welding station.

[0080] As described above, the spot welding connection between the rear body 102 of the front floor and the front floor body 101 in step d, and the spot welding between the front floor body 101 and other structural components in the front floor assembly in step c, are both completed at the same spot welding station. Compared to the previous example, this reduces the number of welding stations for the front floor assembly by one.

[0081] In one example, each structural component has multiple laser pre-welded points 1 at the point where it overlaps with the front floor body 101, with the multiple laser pre-welded points 1 located on opposite sides of the corresponding structural component. The structural component is one of the following: the battery front mounting bracket assembly 3, the airbag ECU mounting plate assembly 4, the front seat front crossbeam assembly 5, the front longitudinal beam upper cover 6, and the center channel connecting plate assembly 7.

[0082] For example, the portion where the mounting bracket assembly 3 in the front of the battery overlaps with the front floor body 101 can have, for example, the following: Figure 5 The three laser pre-soldering points 1 shown can also be four laser pre-soldering points 1, or even five laser pre-soldering points 1.

[0083] The portion where the airbag ECU mounting plate assembly 4 overlaps with the front floor body 101 can have three laser pre-welded points 1, or it can have, for example, three laser pre-welded points 1. Figure 6 The four laser pre-soldering points 1 shown can also have five laser pre-soldering points 1.

[0084] The portion where the front seat crossbeam assembly 5 intersects with the front floor body 101 can have three laser pre-welded points 1, or four laser pre-welded points 1, or other features such as... Figure 7 The five laser pre-soldering points shown are 1.

[0085] The overlapping area between the front longitudinal beam upper cover plate 6 and the front floor body 101 can have three laser pre-welded points 1, or it can have, for example, three laser pre-welded points 1. Figure 8 The four laser pre-soldering points 1 shown can also have five laser pre-soldering points 1.

[0086] The portion where the middle channel connecting plate assembly 7 overlaps with the front floor body 101 can have the following characteristics: Figure 5 The three laser pre-soldering points 1 shown can also have the following characteristics: Figure 9 The four laser pre-soldering points 1 shown can also have five laser pre-soldering points 1.

[0087] This ensures the strength of the laser pre-welding point 1 by laser deep penetration welding between the front floor body 101 and other structural components in the front floor assembly, and avoids possible separation between the other structural components in the front floor assembly and the front floor body 101.

[0088] In this embodiment, the front seat rear crossbeam assembly 2 and other structural components in the front floor assembly are fed together and overlapped with the front floor body 101 at the laser welding station, which eliminates the need to feed the front seat rear crossbeam assembly 2 and other structural components in the front floor assembly separately at two feeding ports.

[0089] At the laser welding station, the front seat rear crossbeam assembly 2 and the front floor body 101 are welded together using laser deep penetration welding. Simultaneously, the front floor body 101 and other structural components in the front floor assembly are welded together at multiple laser pre-welding points 1, forming a first pre-welded component at the laser welding station. This first pre-welded component can then be picked up by a robotic arm and moved to the spot welding station.

[0090] At the spot welding station, the welding between the front floor body 101 and other structural components in the front floor assembly is completed by spot welding. At the same time, the first laser deep penetration weld of the laser pre-welded point 1 is covered and sealed by spot welding.

[0091] This reduces the number of times the front floor assembly needs to be loaded during welding and ensures the water-sealing performance of the front floor assembly.

[0092] It should be noted that the terms "first," "second," etc., used in the specification and claims of this disclosure are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this disclosure can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0093] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A welding method for a front floor assembly, characterized in that, The welding method for the front floor assembly includes the following steps: Step a includes: placing the front floor body (101), the front seat rear crossbeam assembly (2), the battery front mounting bracket assembly (3), the airbag ECU mounting plate assembly (4), the front seat front crossbeam assembly (5), the front longitudinal beam upper cover plate (6), and the center channel connecting plate assembly (7) onto the laser welding station and overlapping them together, and positioning them using the first fixture of the laser welding station; Step b includes: welding the overlapping parts of the front seat rear crossbeam assembly (2) and the front floor body (101) together by laser deep penetration welding, and welding the overlapping parts of the battery front mounting bracket assembly (3), the airbag ECU mounting plate assembly (4), the front seat front crossbeam assembly (5), the front longitudinal beam upper cover plate (6) and the center channel connecting plate assembly (7) with the front floor body (101) together by laser deep penetration welding at multiple laser pre-welding points (1) to form a first pre-welded part; Step c includes: releasing the first clamp, grabbing the first pre-welded part to the spot welding station by the robotic arm, and positioning it by the second clamp of the spot welding station. Then, the overlapping parts of the battery front mounting bracket assembly (3), the airbag ECU mounting plate assembly (4), the front seat front crossbeam assembly (5), the front longitudinal beam upper cover plate (6), and the middle channel connecting plate assembly (7) are spot welded together with the front floor body (101). The first laser deep penetration weld seam welded by laser deep penetration welding on the laser pre-welded point (1) is covered and sealed by spot welding to form the front floor assembly.

2. The welding method for the front floor assembly according to claim 1, characterized in that, In step b, the first laser deep penetration weld is a cross-shaped weld.

3. The welding method for the front floor assembly according to claim 2, characterized in that, The transverse and longitudinal welds in the cross-shaped weld are connected to each other at their respective center positions.

4. The welding method for the front floor assembly according to claim 2, characterized in that, The transverse and longitudinal welds in the cross-shaped weld are of equal length.

5. The welding method for the front floor assembly according to claim 2, characterized in that, The lengths of both the transverse and longitudinal welds in the cross-shaped weld are 3mm to 5mm.

6. The welding method for the front floor assembly according to claim 5, characterized in that, In step c, the diameter of the spot weld covering surface for sealing the first laser deep penetration weld is 5mm to 7mm.

7. The welding method for the front floor assembly according to claim 1, characterized in that, The front floor assembly also includes a rear front floor body (102), and the welding method for the front floor assembly further includes the following steps: Step d includes: welding the front floor body (101) and the rear front floor body (102) together by spot welding to form a first front floor sub-assembly (100).

8. The welding method for the front floor assembly according to claim 7, characterized in that, The spot welding station includes a first spot welding station and a second spot welding station. The first spot welding station has a third clamp, and the second spot welding station has a second clamp. Step d is before step a. Step d further includes: feeding the front floor body (101) and the rear front floor body (102) together through the first loading port to the first spot welding station and overlapping them together, and after positioning them by the third clamp, welding the overlapping parts of the front floor body (101) and the rear front floor body (102) together by spot welding to form the first front floor sub-assembly (100); Step a further includes: feeding the front seat rear crossbeam assembly (2), the battery front mounting bracket assembly (3), the airbag ECU mounting plate assembly (4), the front seat front crossbeam assembly (5), the front longitudinal beam upper cover plate (6), and the central channel connecting plate assembly (7) to the laser welding station through the second loading port to form the second front floor sub-assembly (200), releasing the third clamp, and then picking up the first front floor sub-assembly (100) from the first spot welding station to the laser welding station by a robotic arm, so that the front floor body (101) and the second front floor sub-assembly (200) overlap together and are positioned by the first clamp; Step c further includes: after releasing the first clamp, the first pre-welded part with the rear body (102) of the front floor is picked up by a robotic arm and placed at the second spot welding station, and positioned by the second clamp.

9. The welding method for the front floor assembly according to claim 7, characterized in that, Step c further includes: grabbing the first pre-welded part to the spot welding station by a robotic arm, and then loading the rear body of the front floor (102) onto the spot welding station through the third loading port and overlapping it with the front floor body (101). Then, positioning the first pre-welded part and the rear body of the front floor (102) by the second clamp, and then welding the front floor body (101) and the rear body of the front floor (102) together by spot welding at the spot welding station.

10. The welding method for the front floor assembly according to claim 1, characterized in that, Each structural component has multiple laser pre-welded points (1) at the point where it overlaps with the front floor body (101), and the multiple laser pre-welded points (1) are located on opposite sides of the corresponding structural component. The structural component is one of the following: the battery front mounting bracket assembly (3), the airbag ECU mounting plate assembly (4), the front seat front crossbeam assembly (5), the front longitudinal beam upper cover plate (6), and the center channel connecting plate assembly (7).

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