Tool clamp for sandwich plate welding, welding preparation method and sandwich plate

Abstract

The invention discloses a work fixture for sandwich plate welding, a welding preparation method and a sandwich plate, and relates to the technical field of sandwich plate machining. The work fixture for welding the sandwich plate comprises a core plate mounting seat, two groups of panel clamping assemblies; the welding gun guide assembly comprises two guide rail supports and a guide rail, the two guide rail supports are correspondingly installed at the upper end of the core plate installation base, and the two ends of the guide rail are connected with the guide rail supports respectively; the guide rail corresponds to the upper portion of the welding seam position and is provided with a vertically-through long-strip-shaped welding gun guide hole. In the welding process of the welding gun, the guide rail is used for limiting and guiding, so that the welding gun can be conveniently aligned to a to-be-welded welding seam, the stability of the advancing track during welding of the welding gun is guaranteed, the proper distance between the welding gun and the panel can be guaranteed, and the conditions of uneven welding or welding leakage and the like are prevented.

Description

Technical Field

[0001] The invention relates to the technical field of sandwich plate processing, and more particularly to a sandwich plate welding fixture, a welding preparation method and a sandwich plate. Background Art

[0002] Metal sandwich panels are a new type of lightweight hollow sandwich structure with two panels sandwiching a core panel. They have the characteristics of high specific strength and high specific stiffness and have been widely used in the market. They are widely used in many fields such as ships, bridges, and automobiles. For example, they are often used in automobiles' front panels, roof panels, door panels, fuel tank bottom shells, and outer covers. The application of sandwich panels not only ensures the rigidity requirements of the mechanical structure, but also greatly reduces the weight of the structure, achieving the purpose of lightweighting.

[0003] The research on T-type welded joint sandwich plates has gradually matured, but the research on K-type joint corrugated core sandwich plates is still incomplete. Before welding the sandwich plates, the panel and the core plate need to be fixed by a clamp to facilitate welding and ensure that the panel and the core plate do not move relative to each other during welding. The existing welding fixtures are not suitable for fixing K-type joint sandwich plates, and the existing fixtures cannot ensure the stability of the welding gun's travel trajectory during welding, and cannot ensure that the welding needle and the core plate are at a suitable distance, which affects the welding quality and makes the welding uneven.

[0004] In addition, the existing T-joint sandwich panels are mostly manufactured by arc welding or laser welding. Conventional arc welding has a low degree of automation, and the arc rise heat-affected zone is large, which affects the performance of the welded joint. Moreover, the welding degree is difficult to control, and the core plate welding leakage problem is prone to occur. Laser welding can easily cause the joint connection width between the core plate and the panel to be insufficient, and the gap between the panel and the core plate will cause stress concentration in the welded joint, which reduces the overall strength and toughness of the sandwich structure. Summary of the invention

[0005] In view of this, the present invention aims to provide a sandwich plate welding fixture, a welding preparation method and a sandwich plate to at least to some extent solve the technical problems in the prior art that the stability of the welding gun's travel trajectory cannot be guaranteed during welding, thereby affecting the welding quality, and the existing welding methods cannot guarantee the quality of the welded joint.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A tooling fixture for welding a sandwich panel, the sandwich panel comprises a plurality of welding modules, each welding module comprises two panels and a core panel, the two panels are arranged horizontally in the same plane and a weld is located between the two panels, the top of the core panel corresponds to the weld position of the two panels, and comprises:

[0008] A core board mounting seat, the core board mounting seat comprises two oppositely arranged core board plugging and positioning openings which are provided on one side close to each other and are through-through and used for positioning the two side ends of the core board;

[0009] Two sets of panel clamping assemblies, the two sets of panel clamping assemblies are symmetrically mounted on the upper part of the core plate mounting seat and the clamping openings thereof are horizontally arranged for clamping and positioning the two panels;

[0010] A welding gun guide assembly, the welding gun guide assembly includes a guide rail bracket and a guide rail, two guide rail brackets are provided and are correspondingly installed on the upper end of the core plate mounting seat, and the two ends of the guide rail are respectively connected to the two guide rail brackets; the guide rail corresponds to the upper part of the weld position and is provided with a long strip welding gun guide hole that passes through from top to bottom.

[0011] The beneficial effects that can be achieved by the present invention are as follows: the two side ends of the core plate are respectively inserted into the core plate insertion and positioning ports of the two core plate mounting seats, the two panels are respectively locked and fixed above the core plate by two sets of panel clamping assemblies, and the weld where the two panels are connected is aligned with the top of the core plate, which is convenient for welding the two panels and the connection between the core plates, and the two panels are welded to the core plate together. The long strip welding gun guide hole corresponds to the weld, so that the guide rail can be used for limiting guidance during the welding process of the welding gun, which can not only facilitate the welding gun to be aligned with the weld to be welded and ensure the stability of the moving trajectory of the welding gun during welding, but also maintain a suitable distance between the welding gun and the core plate to prevent uneven welding or welding leakage.

[0012] Furthermore, the core board mounting seat includes a base and two mounting plates, one side end of the base is provided with a core board plug-in positioning port that passes through from top to bottom and is used to position the core board, the two mounting plates are respectively fixed to the top of the base on both sides of the core board plug-in positioning port, and the two groups of panel clamping assemblies are respectively installed on the two mounting plates.

[0013] Furthermore, each group of the panel clamping components includes two panel clamps, and the two panel clamps are respectively mounted on the two mounting plates corresponding to the two bases, and the clamping openings of the two panel clamps are arranged opposite to each other.

[0014] Furthermore, it also includes a panel clamp height adjustment bolt. The mounting plate is provided with a long strip adjustment hole arranged along its height direction. The panel clamp height adjustment bolt is placed on the mounting plate away from the core plate plug-in positioning port and its tail end passes through the long strip adjustment hole and is threadedly connected to the closed end of the panel clamp.

[0015] Furthermore, the guide rail bracket includes a support frame, a pressure plate and a guide rail positioning screw. The support frame is installed in the middle part of the base away from the core board plug-in positioning port. The pressure plate is arranged perpendicular to the support frame and one end is fixed to the top of the support frame, and the other end extends to the side close to the core board plug-in positioning port. The guide rail is placed under the pressure plate, and the guide rail positioning screw is arranged perpendicular to the pressure plate and its tail end passes through the pressure plate and is threadedly connected to the top of the guide rail.

[0016] Furthermore, the guide rail includes two guide bars, which are arranged at intervals along the insertion direction perpendicular to the core plate insertion slot and are both threadedly connected to the bottom of the pressure plate through the guide rail positioning screws, and the long strip welding gun guide hole is formed in the gap between the two guide bars.

[0017] Furthermore, at least one of the bases is installed with an extension frame on a side away from its core board insertion positioning port, and the corresponding support frame of the guide rail bracket is installed on the extension frame so that the guide bar extends to the outside of the base.

[0018] A method for preparing sandwich plate welding comprises the following steps:

[0019] Step 1: Determine the required size of the welded sandwich panel: Design the size of the core panel and the face panel according to the thickness of the sandwich panel to be prepared and the joint connection angle;

[0020] Step 2: Determine the welding groove and size: Design the size of the welding groove according to the connection angle of the sandwich panel joint to be prepared, the panel thickness and the technical requirements of the ultra-narrow gap welding process;

[0021] Step 3: Preparation of fixture: Customize the corresponding size of the fixture according to the connection angle and shape size of the sandwich panel joint to be prepared;

[0022] Step 4: Preparation of flux sheet: Prepare the flux sheet according to the material ratio of the flux sheet in the ultra-narrow gap welding process and the thickness of the sandwich panel to be prepared;

[0023] Step 5: Assembly: The core plate and the face plate of the sandwich panel are fixed by fixtures, and the joints at both ends of the sandwich panel are spot welded to form a pre-welding assembly;

[0024] Step 6: Welding: According to the ultra-narrow gap welding process, the flux sheet prepared in step 4 is applied to both sides of the welding groove on the pre-weld assembly assembled in step 5, and ultra-narrow gap welding is performed to prepare a post-weld assembly;

[0025] Step 7: The welded assembly prepared in step 6 is cooled naturally, and the fixture is removed to prepare a sandwich plate.

[0026] Furthermore, the sandwich panel welding joint in step one is a K-type joint, and chamfers are provided at the connection between the end face of the core panel and its two panel surfaces, and one chamfered surface abuts against the panel surface, and the other chamfered surface abuts against the chamfered surface of the adjacent core panel, and a V-shaped groove is formed at the connection between the two end faces of the core panels.

[0027] A sandwich panel is prepared by adopting the sandwich panel welding preparation method.

[0028] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a tooling fixture for sandwich plate welding, which can lock and fix the core plate and the panel, has high stability, and is provided with a welding gun guide assembly for guiding the welding gun to ensure the stability of the welding gun during welding, and ensure that the welding gun is at a safe distance from the panel and the core plate, thereby improving the welding quality; at the same time, the present invention realizes ultra-narrow gap groove welding with a width of 4-6mm by assembling the core plate and the panel of the sandwich plate by a tooling fixture before welding the sandwich plate, and applying flux sheets on the inner walls of both sides of the I-type welding groove formed by the panel and the core plate. At the same time, arc climbing can be avoided, the width of the heat-affected zone can be reduced, the performance of the sandwich plate welding joint can be improved, and the perfect filling of the sandwich groove can be achieved, so as to achieve good forming of the weld at the junction of the panel and the core plate, and avoid the problem of core plate welding leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of the sandwich panel welding fixture provided by the present invention in working state.

[0031] Figure 2 The present invention is a schematic three-dimensional cross-sectional structural diagram of the sandwich panel welding fixture provided by the present invention in working state.

[0032] Figure 3 This is a schematic diagram of the three-dimensional structure of the sandwich panel welding fixture provided by the present invention.

[0033] Figure 4 The present invention is a schematic diagram of the top view of the sandwich panel welding fixture provided by the present invention.

[0034] Figure 5 The present invention is a schematic cross-sectional structural diagram of the sandwich panel welding fixture provided by the present invention in working state.

[0035] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of part A.

[0036] Figure 7 The present invention is a schematic diagram of the three-dimensional structure of a sandwich panel.

[0037] In the figure:

[0038] 11. Core board mounting seat, 111. Base, 1111. Core board plug-in positioning port, 112. Mounting plate, 1121. Long strip adjustment hole, 12. Panel clamp, 13. Welding gun guide assembly, 131. Guide rail bracket, 1311. Support frame, 1312. Press plate, 1313. Guide rail positioning screw, 132. Guide rail, 1321. Long strip welding gun guide hole, 14. Panel clamp height adjustment bolt, 15. Extension frame;

[0039] 21. Panel, 22. Core board, 23. Flux sheet, 24. Welding seam. DETAILED DESCRIPTION

[0040] 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 described embodiments 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.

[0041] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] See also Figure 1-Figure 6The embodiment of the present invention discloses a sandwich panel welding fixture, wherein the sandwich panel includes a plurality of welding modules, each of which includes two panels 21 and a core panel 22, the two panels 21 are arranged horizontally and coplanarly with a weld position between them, and the top of the core panel 22 corresponds to the weld position 24 of the two panels 21, including:

[0044] The core board mounting seat 11 includes two oppositely arranged core board mounting seats 1111, each of which is close to each other and has a core board insertion and positioning opening 1111 extending vertically and used for positioning the two side ends of the core board 23;

[0045] Two sets of panel clamping assemblies, the two sets of panel clamping assemblies are symmetrically mounted on the upper part of the core plate mounting seat 11 and the clamping openings thereof are arranged horizontally for clamping and positioning two panels 21;

[0046] The welding gun guide assembly 13 includes a guide rail bracket 131 and a guide rail 132. Two guide rail brackets 131 are provided and are correspondingly installed on the upper end of the core plate mounting seat 11. The two ends of the guide rail 132 are respectively connected to the two guide rail brackets 131; the guide rail 132 corresponds to the upper part of the weld 24 and is provided with a long strip welding gun guide hole 1321 that passes through from top to bottom.

[0047] Specifically, the core board mounting seat 11 includes a base 111 and two mounting plates 112. A core board insertion and positioning opening 1111 that runs through from top to bottom and is used to position the core board 22 is provided at one end of the base 111. The other end is mounted on the base surface through a connecting frame. The two mounting plates 112 are respectively fixed to the top of the other end of the base 111 on both sides of the core board insertion and positioning opening 1111. The two sets of panel clamping assemblies 12 are respectively mounted on the two mounting plates 112. After the core board 22 is inserted into the core board insertion and positioning opening 1111, its bottom abuts against the base surface.

[0048] The core plate insertion and positioning opening 1111 is through-connected from top to bottom. After the welding module is formed by welding, it can be turned upside down and fixed with another welding module by welding.

[0049] According to the type of sandwich panel welding joint, a corresponding core plate plug-in positioning hole 1111 can be designed. For example, when used for a T-type welding joint, the core plate plug-in positioning hole 1111 is a vertically arranged plug-in positioning hole. When used for a K-type welding joint, the core plate plug-in positioning hole 1111 includes two plug-in positioning holes whose lower ends are inclined away from each other.

[0050] Specifically, it also includes a panel clamp height adjustment bolt 14. The mounting plate 112 is provided with a long strip adjustment hole 1121 arranged along its height direction. The panel clamp height adjustment bolt 14 is placed on the mounting plate away from the core plate plug-in positioning port 1111 and its tail end passes through the long strip adjustment hole 1121 and is threadedly connected to the closed end of the panel clamp 12. The position of the panel clamp height adjustment bolt 14 in the adjustment hole can be adjusted to adjust the height of the panel.

[0051] Specifically, the guide rail bracket 131 includes a support frame 1311, a pressure plate 1312 and a guide rail positioning screw 1313. The support frame 1311 is installed in the middle of the base 111 away from the core board plug-in positioning port 1111. The pressure plate 1312 is arranged vertically on the support frame 1311 and one end is fixed on the top of the support frame 1311, and the other end extends to the side close to the core board plug-in positioning port 1111. The guide rail 132 is placed below the pressure plate 1312. The guide rail positioning screw 1313 is arranged vertically on the pressure plate 1312 and its tail end passes through the pressure plate 1312 and is threadedly connected to the top of the guide rail 132. According to the thickness of the panel to be welded, the height of the guide rail 132 can be adjusted by adjusting the guide rail positioning screw 1313.

[0052] Specifically, the guide rail 132 includes two guide bars, which are symmetrically arranged on both sides of the weld and form a long welding gun guide hole 1321 at the connection point. Each guide bar is threadedly connected to the bottom of the pressure plate 1312 through a guide rail positioning screw 1313.

[0053] The pressure plate 1312 includes two pressure strips, which are symmetrically arranged on the top of the support frame on both sides of the weld. Two guide bars are threadedly connected to the bottom of the two pressure strips through guide rail positioning screws 1313 respectively. The connection between the two pressure strips forms an avoidance hole corresponding to and connected to the long strip welding gun guide hole 1321.

[0054] An avoidance notch is provided at the top of the support frame 1311 corresponding to the avoidance hole to facilitate the introduction or export of the welding needle on the welding gun.

[0055] Specifically, at least one of the bases 111 is installed with an extension frame 15 on one side away from the core plate insertion positioning port 1111, and the support frame 1311 of the corresponding guide rail bracket 131 is installed on the extension frame 15, so that the guide bar extends to the outside of the base 111. At least one end of the guide rail 132 extends to the outside of the base, which can ensure that the welding gun can enter the welding track in advance to complete the welding of the entire groove.

[0056] A method for preparing sandwich plate welding comprises the following steps:

[0057] Step 1: Determine the required size of the welded sandwich panel: Design the size of the face plate 21 and the core plate 22 according to the thickness of the face plate 21 and the core plate 22 of the sandwich panel to be prepared and the angle relationship between the face plate 21 and the core plate 22 .

[0058] like Figure 2 , Figure 5 and Figure 6 As shown, when the sandwich panel to be prepared is a K-type joint, a chamfer is provided at the connection between the top end face of each core plate 22 and its two plate surfaces, and one chamfered surface abuts against the panel 21, and the other chamfered surface abuts against the chamfered surface of the adjacent core plate 22, thereby strengthening the stability of the overlap between the core plate 22 and the panel 21 and between the core plates 22, and forming a V-shaped groove at the connection between the top end faces of the two adjacent core plates 22 to enhance the welding strength.

[0059] Step 2: Determine the welding groove and size: According to the connection angle of the sandwich panel joint to be prepared, the thickness of the panel 21 and the technical requirements of the ultra-narrow gap welding process, that is, the groove width is between 4-6mm, design the size of the welding groove and the overlap position of the panel 21 and the core plate 22, such as Figure 5 , Figure 6 As shown; among them, the welding groove adopts I type.

[0060] Step 3: Preparation of tooling fixture: According to the connection angle and shape size of the sandwich panel joint to be prepared, the corresponding size of the tooling fixture is formulated to ensure that the core panel 22 can be firmly clamped in the core panel plug-in positioning port 1111, and the panel 21 can be firmly clamped in the clamping port of the panel clamp 12; in the example, in order to facilitate the spot welding operation, the base 111 of the fixture adopts an integral molding processing method, which can ensure that the angle of each group of sandwich panel joints is consistent and reduce the overall error.

[0061] In addition, the angle error range of the fixture is no more than 1 degree, and the fixture is made of metal, preferably 304 stainless steel.

[0062] Step 4: Preparation of flux sheet 23: Prepare the flux sheet 23 according to the material ratio of the flux sheet 23 in the existing ultra-narrow gap welding process, and determine the size of the flux sheet 23 according to the thickness of the sandwich panel 21 to be prepared.

[0063] In a specific embodiment, the thickness of the flux sheet 23 is preferably 0.7 mm, and the error shall not be greater than 0.01 mm. A plurality of flux sheets 23 are bonded together through a glass fiber mesh to form a flux belt.

[0064] Step 5: Assembly: According to the dimensions of the sandwich panel face plate 21 and the core panel 22 determined in steps 1 and 2, and the dimensions of the welding groove, the core panel 22 and the face plate 21 of the sandwich panel are fixed with the metal fixture prepared in step 3, and the overlap joints at both ends of the sandwich panel are spot welded to form a pre-weld assembly.

[0065] The specific assembly process is: first, install the two core panels 22 into the core panel insertion and positioning ports 1111 of the two core panel mounting seats 11, and place the assembly on the base surface. Secondly, install the four panel clamps 12 on the core panel mounting seats 11 through the four panel clamp height adjustment bolts 14. Do not tighten the panel clamp height adjustment bolts 14 first. At this time, embed the two panels 21 into the clamping ports of the panel clamps 12 to ensure that the two panels 21 are level and fit with the chamfered surface of the core panel 22. At this time, tighten all the panel clamp height adjustment bolts 14. The schematic diagram of the assembled structure is as follows: Figure 1 shown.

[0066] During the assembly process, it is necessary to ensure that the two core plates 22 and the two face plates 21 have a common connection point, and that the end faces of the two core plates 22 and the two face plates 21 are coplanar without any misalignment, so as to ensure that the surfaces of the two face plates 21 are level. After the assembly is completed, spot welding is performed on the two ends of the face plates 21 and the core plates 22 and the overlap points of the face plates 21 and the core plates 22 to ensure that during the overall welding process, the relative positions of the face plates 21 and the core plates 22 do not change slightly.

[0067] Before spot welding, it is necessary to ensure that the fixture and the end faces of the sandwich plate are in the correct position relative to each other to avoid welding the fixture and the sandwich plate together.

[0068] Step 6: Welding: According to the ultra-narrow gap welding process, apply the flux tape prepared in step 4 to both sides of the welding groove on the pre-welding assembly assembled in step 5, and lay two guide bars on both sides of the groove to fit the welding side of the panel 21, and then install the guide rail bracket 131 and the extension frame 15 according to the Figure 1 , assembled on the pre-welding assembly assembled in step five, screwed in the fastening bolts and four welding gun guide rail positioning screws 1313, after completing this step, check the cleanliness of the sandwich plate groove, and ensure that the flux sheet 23 is firmly attached, and then perform ultra-narrow gap welding to prepare a post-welding assembly, in which the side of the guide rail 132 close to the extension frame 15 is longer and extends out of the range of the sandwich plate panel 21, in order to ensure that the welding gun suitable for ultra-narrow gap welding technology can enter the welding track in advance and complete the welding of the entire groove. During the welding process, the welding needle of the welding gun can be inserted into the long strip welding gun guide hole 1321, and the main body of the welding gun is isolated above the guide rail to keep a safe distance between the welding needle and the welding part, reduce the heat-affected area, and prevent welding leakage.

[0069] Step 7: Cool the welded assembly prepared in step 6 naturally, and remove the metal fixture to obtain a welding module of a single sandwich panel K-type welding joint; the panel clamp 121 and the panel clamp height adjustment bolt 14 do not need to be removed during the disassembly process, which can ensure that the position relationship between the next set of panels 21 and the core plate 22 is the same as this set, reducing errors. Repeat the above steps to obtain a complete sandwich panel. Figure 7 shown.

[0070] After one welding process is completed, it is necessary to first check whether there is any abnormality in the previous weld and whether the weld is completely filled. If not, the next welding process cannot be carried out immediately; if there is no abnormality, the weld must be cleaned before the next welding process can be carried out.

[0071] The present invention also provides a sandwich panel, which is prepared by adopting the above-mentioned sandwich panel welding preparation method.

[0072] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0073] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tooling fixture for welding a sandwich panel, the sandwich panel comprising a plurality of welding modules, each welding module comprising two face plates (21) and a core plate (22), the two face plates (21) being arranged horizontally in the same plane with a weld position between the two face plates (21), the top end of the core plate (22) corresponding to the weld position (24) of the two face plates (21), comprising: A core plate mounting seat (11), the core plate mounting seat (11) comprising two oppositely arranged core plate plug-in positioning openings (1111) each of which is provided on one side close to each other and is through-through and used for positioning two side ends of the core plate (23); Two groups of panel clamping assemblies, the two groups of panel clamping assemblies are symmetrically mounted on the upper part of the core plate mounting seat (11) and their clamping openings are arranged horizontally for clamping and positioning the two panels (21); A welding gun guide assembly (13), the welding gun guide assembly (13) comprising a guide rail bracket (131) and a guide rail (132), the guide rail bracket (131) being provided with two and correspondingly mounted on the upper end of the core plate mounting seat (11), the two ends of the guide rail (132) being respectively connected to the two guide rail brackets (131); the guide rail (132) being provided with a long strip welding gun guide hole (1321) extending from top to bottom and correspondingly above the position of the welding seam (24).

2. The sandwich panel welding fixture according to claim 1, characterized in that: The core board mounting seat (11) comprises a base (111) and two mounting plates (112); one side end of the base (111) is provided with a core board plug-in positioning opening (1111) which runs through from top to bottom and is used to position the core board (22); the two mounting plates (112) are respectively fixed to the top of the base (111) on both sides of the core board plug-in positioning opening (1111); and the two groups of panel clamping assemblies are respectively mounted on the two mounting plates (112).

3. The sandwich panel welding fixture according to claim 2, characterized in that: Each group of the panel clamping components comprises two panel clamps (12), and the two panel clamps (12) are respectively mounted on two mounting plates (112) corresponding to the two bases (111), and the clamping openings of the two panel clamps (12) are arranged opposite to each other.

4. The sandwich panel welding fixture according to claim 3, characterized in that: It also includes a panel clamp height adjustment bolt (14), and the mounting plate (112) is provided with an elongated adjustment hole (1121) arranged along its height direction in the length direction. The panel clamp height adjustment bolt (14) is placed on the mounting plate (112) on the side away from the core plate plug-in positioning port (1111), and its tail end passes through the elongated adjustment hole (1121) and is threadedly connected to the closed end of the panel clamp (12).

5. The sandwich panel welding fixture according to claim 2, characterized in that: The guide rail bracket (131) includes a support frame (1311), a pressure plate (1312) and a guide rail positioning screw (1313); the support frame (1311) is installed in the middle of the base (111) away from its core board plug-in positioning port (1111); the pressure plate (1312) is arranged perpendicular to the support frame (1311) and one end is fixed to the top of the support frame (1311), and the other end extends to the side close to the core board plug-in positioning port (1111); the guide rail (132) is placed below the pressure plate (1312); the guide rail positioning screw (1313) is arranged perpendicular to the pressure plate (1312) and its tail end passes through the pressure plate (1312) and is threadedly connected to the top of the guide rail (132).

6. The sandwich panel welding fixture according to claim 5, characterized in that: The guide rail (132) includes two guide bars, which are symmetrically arranged on both sides of the weld and form the long strip welding gun guide hole (1321) at their connection. Each guide bar is threadedly connected to the bottom of the pressure plate (1312) through the guide rail positioning screw (1313).

7. The sandwich panel welding fixture according to claim 6, characterized in that: An extension frame (15) is installed on a side of at least one of the bases (111) away from its core board insertion positioning port (1111), and a support frame (1311) of the corresponding guide rail bracket (131) is installed on the extension frame (15) so that the guide bar extends to the outside of the base (111).

8. A method for preparing a sandwich plate by welding, comprising the following steps: Step 1: Determine the required size of the welded sandwich panel: Design the size of the core panel and the face panel according to the thickness of the sandwich panel to be prepared and the joint connection angle; Step 2: Determine the welding groove and size: Design the size of the welding groove according to the connection angle of the sandwich panel joint to be prepared, the panel thickness and the technical requirements of the ultra-narrow gap welding process; Step 3: Preparation of fixture: Customize the corresponding size of the fixture according to the connection angle and shape size of the sandwich panel joint to be prepared; Step 4: Preparation of flux sheet: Prepare the flux sheet according to the material ratio of the flux sheet in the ultra-narrow gap welding process and the thickness of the sandwich panel to be prepared; Step 5: Assembly: The core plate and the face plate of the sandwich panel are fixed by fixtures, and the joints at both ends of the sandwich panel are spot welded to form a pre-welding assembly; Step 6: Welding: According to the ultra-narrow gap welding process, the flux sheet prepared in step 4 is applied to both sides of the welding groove on the pre-weld assembly assembled in step 5, and ultra-narrow gap welding is performed to prepare a post-weld assembly; Step 7: The welded assembly prepared in step 6 is cooled naturally, and the fixture is removed to prepare a sandwich plate.

9. A method for preparing sandwich plate welding according to claim 8, characterized in that: The sandwich plate welding joint in step 1 is a K-type joint, and a V-shaped groove is formed at the connection between the two core plates.

10. A sandwich panel manufactured by the method for manufacturing a sandwich panel by welding according to any one of claims 8 to 9.

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