Welding process device and method for doorway of side wall thin-wall frame structure of motor train unit project

Abstract

The invention discloses a welding process device and method for a gate of a side wall thin-wall frame structure of a motor train unit project. The welding process device comprises a bottom support supported at the bottom of the device. The side wall upper edge clamping assembly is arranged on the upper portion of the bottom support and used for clamping and fixing the upper edge of a side wall. The cross beam clamping assembly is arranged at the upper part of the bottom bracket and is used for positioning and fixing an upper edge and a door frame cross beam; a water storage and slow cooling structure is arranged between the side wall upper edge clamping assembly and the upper edge of the side wall, the specific heat capacity of a medium filled in the water storage and slow cooling structure is larger than that of a body material of the water storage and slow cooling structure, and the thermal conductivity of the water storage and slow cooling structure is smaller than that of the body material of the water storage and slow cooling structure. According to the process device and method, welding deformation can be effectively controlled, the welding quality and the production efficiency are improved, and good application prospects and popularization value are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of manufacturing technology of motor train unit car body, and particularly relates to a motor train unit project side wall thin plate frame structure door opening welding process device and method. BACKGROUND

[0002] In the manufacturing of the motor train unit car body of the rail vehicle, the side wall is one of the most critical large components, which connects the roof, the end wall and the underframe, and the appearance quality thereof directly represents the appearance of the whole vehicle. The weld at the door opening is the most important, and the welding quality thereof plays a key role in the safety, sealing and service life of the whole vehicle. In the past, the upper part of the door opening of the motor train unit project has no welding structure, and is integrally machined and formed. However, the new generation of CR450 motor train unit has the advantages of high speed, low energy consumption and high safety, and the welding structure of the door frame beam is added at the door opening of the side wall.

[0003] According to the traditional welding process device and method, the operator needs to manually assemble the door frame beam and weld and fix the same, and then integrally weld. According to the working experience of the welding engineer and the welding software simulation, this process method will cause the post-welding door opening to collapse and deform, resulting in the loss of the appearance flatness, and the flatness in the area of 50mm above and below the weld will reach 8mm or more, the local depression will be 10mm, and the overall flatness of the side wall in the length direction of the car body will be 8.5mm or more, which cannot meet the size and appearance quality requirements of the new structure.

[0004] The root cause of such a large deformation of the welding structure at this position is that the thermal conductivity of the aluminum alloy is high, the material rigidity is low, the welding process parameters are selected to cause a large heat input per unit time, and especially when the heat input is too large during the welding of the thin plate structure, the heat rapidly spreads, the rapid heat conduction causes a large temperature gradient between the welding area and the surrounding area, and the frame structure deformation is more concentrated in the area with the lowest rigidity. Therefore, the original process method cannot avoid a large deformation.

[0005] Therefore, based on the above technical problems, the technical personnel in the field urgently need to develop a motor train unit project side wall thin plate frame structure door opening welding process device and method. SUMMARY

[0006] The purpose of the present application is to provide a motor train unit project side wall thin plate frame structure door opening welding process device and method, which can effectively solve the problems of the welding quality and serious post-welding deformation of the CR450 side wall door frame beam, realize effective control of the welding area, and improve the welding quality and the appearance of the car body.

[0007] In order to achieve the above purpose, the present application provides the following technical solutions:

[0008] The motor train unit project side wall thin plate frame structure door opening welding process device of the present application comprises:

[0009] a bottom support supported on the bottom of the device;

[0010] a side wall upper edge clamping assembly arranged on the upper part of the bottom support to clamp the upper edge of the side wall; and

[0011] a beam clamping assembly arranged on the upper part of the bottom support to position and fix the upper edge and the beam of the door frame;

[0012] a water storage and slow cooling structure arranged between the side wall upper edge clamping assembly and the upper edge of the side wall, the water storage and slow cooling structure being filled with a medium having a specific heat capacity greater than that of the material of the water storage and slow cooling structure and a thermal conductivity less than that of the material of the water storage and slow cooling structure.

[0013] Further, the bottom support comprises:

[0014] a supporting leg supported on the ground, the upper end of the supporting leg having a first connecting part;

[0015] a mounting rod connected between the two supporting legs, the mounting rod being arranged on the upper part of the supporting leg and being a second connecting part.

[0016] Further, the side wall upper edge clamping assembly is connected to the first connecting part at the upper end of the supporting leg;

[0017] The side wall upper edge clamping assembly comprises:

[0018] a side wall upper edge clamping assembly bottom rod; and

[0019] a side wall upper edge clamping clamp link rod connected to the two ends of the side wall upper edge clamping assembly bottom rod, the end of the side wall upper edge clamping clamp link rod being provided with a side wall upper edge clamping clamp.

[0020] Further, the connection between the side wall upper edge clamping assembly bottom rod and one of the side wall upper edge clamping clamp link rods is mounted on the first connecting part of the base support;

[0021] The inclination angle of the side wall upper edge clamping clamp of the side wall upper edge clamping assembly matches the angle of the upper edge of the side wall, and the upper and lower surfaces of the upper edge of the side wall are clamped by the side wall upper edge clamping clamp of the side wall upper edge clamping assembly, respectively.

[0022] A water storage and slow cooling structure is arranged between the corresponding side wall upper edge clamping clamps of the two sets of side wall upper edge clamping assemblies to contact the corresponding surfaces of the upper edge of the side wall.

[0023] Further, the water storage and slow cooling structure is made of aluminum alloy material, and a medium cavity is formed in the water storage and slow cooling structure, and the medium cavity is filled with water, and the water injection hole of the water storage and slow cooling structure is blocked by a sealing plug.

[0024] Further, a reinforcing connecting beam is mounted on the mounting rod, and the upper end of the reinforcing connecting beam is provided with the cross beam clamping assembly;

[0025] The cross beam clamping assembly comprises:

[0026] a cross beam clamping assembly bottom rod; and

[0027] a cross beam clamping clamp link connected to both ends of the cross beam clamping assembly bottom rod, and the end of the cross beam clamping clamp link is provided with a cross beam clamping clamp;

[0028] The connection between the cross beam clamping assembly bottom rod and one of the cross beam clamping clamp links is connected to the upper end of the reinforcing connecting beam;

[0029] The cross beam clamping clamp of the cross beam clamping assembly is used to contact the outer side of the upper edge of the side wall and the side of the opposite side of the door frame cross beam, and the upper edge and the door frame cross beam are clamped and positioned by the cross beam clamping clamp.

[0030] The welding process method of the door opening of the thin-walled frame structure of the side wall of the EMU project is based on the welding process device of the door opening of the thin-walled frame structure of the side wall of the EMU project as described above.

[0031] Further, the process method mainly comprises the following steps:

[0032] S1, after the to-be-welded area is polished before welding, according to the parameters of the aluminum alloy material of the model 6005A-T6 of the thin-walled frame body and the thickness of 3mm of the aluminum alloy material, the weld is densely spot-welded, the spot-welding interval is 10mm-15mm, and the welding parameters are set;

[0033] S2, after the weld is cooled to room temperature, all the spot-welding positions in step S1 are polished, the spot-welding positions are cut and grooved using a cutting tool, a V-shaped groove is processed, and the depth of the V-shaped groove is 1.5mm-2mm;

[0034] S3, the weld is welded again, and the welding is performed in a segmental manner with a welding interval of 100mm and a 100mm interval, and the welding parameters are set;

[0035] S4, after the weld is cooled to room temperature, the arc starting and arc ending positions at both ends of the segmental weld in step S3 are polished, and after polishing, the 10mm positions at both ends of the segmental weld are cut and grooved using a cutting tool, a V-shaped groove is processed, and the depth of the V-shaped groove is 1.5mm-2mm;

[0036] S5, three times welding is performed on the weld, the weld left by the segment welding in step S3 is welded, and welding parameters are set;

[0037] S6, after the weld cools to room temperature, post-weld grinding is performed on the weld;

[0038] S7, after the grinding is completed, the clamping device is loosened, appearance inspection and size measurement are performed on the side wall, and mechanical correction is performed on the deformation part to ensure that the overall flatness and local collapse and bending deformation are within 1mm.

[0039] Further, the welding parameters in step S1 are set as a welding current of 220A and a welding voltage of 23V;

[0040] The welding parameters in step S3 are set as a welding current of 170A, a welding voltage of 21V, and a welding speed of 8.3mm / s;

[0041] The welding parameters in step S5 are set as a welding current of 170A, a welding voltage of 21V, and a welding speed of 8.3mm / s.

[0042] In the above technical solution, the train set project side wall thin wall frame structure door welding process device provided by the application has the following beneficial effects:

[0043] The process device and method can effectively control welding deformation, high-precision positioning tooling and low-thermal-conductivity water storage and slow cooling structure, a welding process method of multiple segmented skip welding, reduced heat input per unit time, ensure the stability of the thin wall frame during the welding process, accurately control the heat input, effectively reduce the welding deformation caused by uneven heating, and improve the size accuracy.

[0044] The process device and method can ensure welding quality, the weld is finally formed through spot welding, segment welding, and continuous welding, the weld meat and the groove are processed multiple times during the process, welding defects can be found and processed in time, combined with accurate heat input control, the weld quality is stable and meets high standard requirements.

[0045] The process device and method can adjust the positioning tooling and the water storage and slow cooling structure according to different structures of the thin wall frame, the welding parameters can be modified according to the material and size of the frame, and the process device and method are suitable for welding of various thin wall frame structures of rail vehicles.

[0046] The process device and method can effectively control welding deformation, improve welding quality and production efficiency, and have good application prospect and popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to make the technical scheme of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments will be briefly introduced. Obviously, the accompanying drawings in the following description only aim to explain some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0048] Fig. 1 A structure schematic diagram of a door opening welding process device of a thin-wall frame structure of a side wall of a motor train unit project disclosed in the embodiments of the present application is shown in the figure.

[0049] Fig. 2 An exploded view of the door opening welding process device of the thin-wall frame structure of the side wall of the motor train unit project disclosed in the embodiments of the present application is shown in the figure.

[0050] Fig. 3 A structure schematic diagram of a use state of the door opening welding process device of the thin-wall frame structure of the side wall of the motor train unit project disclosed in the embodiments of the present application is shown in the figure.

[0051] Explanation of reference signs:

[0052] 10, device;

[0053] 20, side wall; 21, upper edge; 22, door frame cross beam;

[0054] 1, base support; 2, reinforcing connecting beam; 3, side wall upper edge clamping assembly; 4, cross beam clamping assembly; 5, water storage and slow cooling structure;

[0055] 101, support leg; 102, first connecting part; 103, mounting rod;

[0056] 301, side wall upper edge clamping assembly bottom rod; 302, side wall upper edge clamping clamp connecting rod; 303, side wall upper edge clamping clamp;

[0057] 401, cross beam clamping assembly bottom rod; 402, cross beam clamping clamp connecting rod; 403, cross beam clamping clamp. DETAILED DESCRIPTION

[0058] In order to make those skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail below with reference to the accompanying drawings.

[0059] Referring to Figs. 1 to 3 the figure;

[0060] The door opening welding process device of the thin-wall frame structure of the side wall of the motor train unit project of the present embodiment, the device 10 comprises:

[0061] A bottom support 1 supported at the bottom of the device 10;

[0062] A side wall upper edge clamping assembly 3 arranged on the upper portion of the bottom support 1 and used to clamp the upper edge 21 of the side wall 20; and

[0063] A crossbeam clamping assembly 4 arranged on the upper portion of the bottom support 1 and used to position and fix the upper edge 21 and the door frame crossbeam 22;

[0064] A water storage and slow cooling structure 5 is arranged between the side wall upper edge clamping assembly 3 and the upper edge 21 of the side wall 20, the specific heat capacity of the medium filled in the water storage and slow cooling structure 5 is greater than the specific heat capacity of the material of the body of the water storage and slow cooling structure 5, and the thermal conductivity of the water storage and slow cooling structure 5 is less than the thermal conductivity of the material of the body of the water storage and slow cooling structure 5.

[0065] Secondly, more preferably, the water storage and slow cooling structure 5 of the embodiment is made of aluminum alloy material, and a medium cavity is formed in the water storage and slow cooling structure 5, and water is filled in the medium cavity, and the water injection hole of the water storage and slow cooling structure 5 is blocked by a sealing plug.

[0066] Specifically, the embodiment discloses a process device suitable for welding of a thin-walled frame structure of a side wall door of a new-type motor train unit, which mainly comprises a base support 1, a crossbeam clamping assembly 4 and a side wall upper edge clamping assembly 3, the upper edge 21 of the side wall 20 is positioned and clamped by the side wall upper edge clamping assembly 3, and the upper edge 21 and the door frame crossbeam 22 are clamped and positioned by the crossbeam clamping assembly 4, so that the relative positions of the upper edge 21 and the door frame crossbeam 22 are maintained. Meanwhile, the embodiment also designs a water storage and slow cooling structure 5, which is described as follows. The water storage and slow cooling structure 5 of the embodiment is made of aluminum alloy material, is hollow inside, and has a water injection port arranged at the port. Water can be filled in the water storage and slow cooling structure 5, specifically, water not lower than room temperature (20℃) is filled in the water storage and slow cooling structure 5, the specific heat capacity of the water is much greater than that of the aluminum alloy, and the thermal conductivity of the water is much less than that of the aluminum alloy, so that the heat diffusion speed in the welding process can be reduced, and the temperature gradient between the locking pin welding area and the surrounding area can be locked.

[0067] Preferably, the bottom support 1 of the embodiment comprises support legs 101 supported on the ground, the upper end of each support leg 101 has a first connecting portion 102; and a mounting rod 103 connected between the two support legs 101, the mounting rod 103 is arranged on the upper portion of the support legs 101, and the mounting rod 103 is a second connecting portion.

[0068] The embodiment further limits the structure of the base support 1, all mechanisms on the upper portion of the tooling of the embodiment are supported by the two support legs 101. The base support 1 has certain rigidity and stability, and ensures safety in the operation process.

[0069] Specifically, the side wall upper edge clamping assembly 3 of the embodiment is connected to the first connecting portion 102 of the upper end of the support leg 101.

[0070] The upper side wall clamping assembly 3 comprises an upper side wall clamping assembly bottom rod 301, and an upper side wall clamping clamp connecting rod 302 connected to both ends of the upper side wall clamping assembly bottom rod 301, and an upper side wall clamping clamp 303 mounted at the end of the upper side wall clamping clamp connecting rod 302.

[0071] In addition, the connection between the upper side wall clamping assembly bottom rod 301 and one of the upper side wall clamping clamp connecting rods 302 is mounted on the first connecting portion 102 of the base support 1.

[0072] The inclination angle of the upper side wall clamping clamp 303 of the upper side wall clamping assembly 3 matches the angle of the upper edge 21 of the side wall 20, and the upper and lower surfaces of the upper edge 21 of the side wall 20 are clamped by the upper side wall clamping clamp 303 of the upper side wall clamping assembly 3, respectively.

[0073] The corresponding upper side wall clamping clamps 303 of the two sets of upper side wall clamping assemblies 3 are provided with water storage and slow cooling structures 5 for contacting the corresponding surfaces of the upper edge 21 of the side wall 20.

[0074] As can be seen from the figure, the upper side wall clamping assembly 3 of the present embodiment is in an inclined state and is installed at the first connecting portion 102 of the upper end of the two supporting legs 101, and the inclination angle thereof needs to completely match the inclination angle of the upper edge 21 of the side wall 20, so that the upper side wall clamping clamps 303 on both sides of the upper side wall clamping assembly 3 can clamp and position the upper and lower surfaces of the upper edge 21, respectively.

[0075] Preferably, the mounting rod 103 of the present embodiment is provided with a reinforcing connecting beam 2, and the upper end of the reinforcing connecting beam 2 is provided with a cross beam clamping assembly 4.

[0076] The cross beam clamping assembly 4 comprises a cross beam clamping assembly bottom rod 401, and a cross beam clamping clamp connecting rod 402 connected to both ends of the cross beam clamping assembly bottom rod 401, and a cross beam clamping clamp 403 provided at the end of the cross beam clamping clamp connecting rod 402.

[0077] The connection between the cross beam clamping assembly bottom rod 401 and one of the cross beam clamping clamp connecting rods 402 is connected to the upper end of the reinforcing connecting beam 2.

[0078] The cross beam clamping clamp 403 of the cross beam clamping assembly 4 is used to contact the outer side surface of the upper edge 21 of the side wall 20 and the opposite side surface of the door frame cross beam 22, and to clamp and position the upper edge 21 and the door frame cross beam 22 by the cross beam clamping clamp 403. The door frame cross beam 22 to be welded is supported and clamped by the cross beam clamping assembly 4, so as to ensure the accurate position before welding and the clamping effect during welding.

[0079] This embodiment further defines the structure of the beam clamping assembly 4, which is installed above the two legs 101 by the reinforcing connecting beam 2 and is also arranged in an inclined manner. It needs to ensure that the beam clamping fixture 403 is positioned and clamped on the upper edge 21 and the door frame beam 22 respectively.

[0080] This embodiment further defines the process method for welding the doorway of the thin-walled frame structure of the side wall of the EMU project based on the above-mentioned tooling;

[0081] Specifically, the welding process method for the doorway of the thin-walled frame structure of the EMU project in this embodiment is based on the welding process device 10 for the doorway of the thin-walled frame structure of the EMU project as described above.

[0082] The process mainly includes the following steps:

[0083] S1. After grinding the area to be welded before welding, according to the aluminum alloy material of the thin-walled frame model 6005A-T6 and the parameter requirement that the thickness of the aluminum alloy material is 3mm, perform dense spot welding on the weld seam, and the spacing between the weld spots is 10mm to 15mm, and set the welding parameters.

[0084] S2. After the weld has cooled to room temperature, grind all the welded areas in step S1 flat, use a cutting tool to cut grooves on the weld points, and process a V-shaped bevel with a depth of 1.5mm to 2mm.

[0085] S3. Perform secondary welding on the weld seam, and use a segmented welding method with 100mm intervals between welds, and set the welding parameters;

[0086] S4. After the weld has cooled to room temperature, grind the arc starting and ending points at both ends of the segment weld in step S3. After grinding, use a cutting tool to cut grooves 10mm from both ends of the segment weld to process a V-shaped bevel, and the depth of the V-shaped bevel is 1.5mm to 2mm.

[0087] S5. Perform three welding operations on the weld seam, welding the weld seam that was left unwelded in the middle section of step S3, and set the welding parameters.

[0088] S6. After the weld has cooled to room temperature, perform post-weld grinding.

[0089] S7. After grinding, loosen the clamping device, perform visual inspection and dimensional measurement of the side wall, and mechanically correct the deformed parts to ensure that the overall flatness and local collapse and bending deformation are within 1mm.

[0090] Preferably, in this embodiment, the welding parameters in step S1 are set as welding current 220A and welding voltage 23V; the welding parameters in step S3 are set as welding current 170A, welding voltage 21V and welding speed 8.3mm / s; and the welding parameters in step S5 are set as welding current 170A, welding voltage 21V and welding speed 8.3mm / s.

[0091] The welding process device for the doorway of a thin-walled frame structure for a high-speed train project provided by the present invention has the following beneficial effects:

[0092] The process apparatus and method of the present invention can effectively control welding deformation. The high-precision positioning fixture and the low thermal conductivity water storage and slow cooling structure 5, as well as the welding process method of multiple segmented skip welding, reduce the heat input per unit time, ensure the stability of the thin-walled frame during the welding process, accurately control the heat input, effectively reduce welding deformation caused by uneven heating, and improve dimensional accuracy.

[0093] The process apparatus and method of the present invention can ensure welding quality. The weld is finally formed through spot welding, segment welding and continuous welding. During the process, the weld and bevel are processed multiple times, which can detect and deal with welding defects in time. Combined with precise heat input control, the weld quality is ensured to be stable and meet high standard requirements.

[0094] The process apparatus and method of the present invention employs positioning fixtures and a water storage and slow cooling structure 5, which can be adjusted according to different thin-walled frame structures. The welding parameters can be modified according to the frame material and size, and it is applicable to the welding of various thin-walled frame structures of rail vehicles.

[0095] The process apparatus and method of the present invention can effectively control welding deformation, improve welding quality and production efficiency, and have good application prospects and promotion value.

[0096] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A welding process device for the doorway of a thin-walled frame structure on the side wall of a high-speed train project, characterized in that... The device (10) includes: A bottom bracket (1) is supported at the bottom of the device (10); A sidewall upper edge clamping assembly (3) is provided on the upper part of the bottom bracket (1) for clamping and fixing the upper edge (21) of the sidewall (20); and A beam clamping assembly (4) is installed on the upper part of the bottom bracket (1) to position and fix the upper edge (21) and the door frame beam (22); A water storage and slow cooling structure (5) is provided between the upper edge clamping assembly (3) of the side wall and the upper edge (21) of the side wall (20). The specific heat capacity of the medium filled inside the water storage and slow cooling structure (5) is greater than the specific heat capacity of the material of the water storage and slow cooling structure (5), and the thermal conductivity of the water storage and slow cooling structure (5) is less than the thermal conductivity of the material of the water storage and slow cooling structure (5).

2. The welding process device for the doorway of the thin-walled frame structure of the EMU project side wall according to claim 1, characterized in that, The bottom support (1) includes: A support leg (101) is supported on the ground, and the upper end of the support leg (101) has a first connecting part (102); An mounting rod (103) is connected between two support legs (101), and the mounting rod (103) is located on the upper part of the support leg (101), and the mounting rod (103) is a second connecting part.

3. The welding process device for the doorway of the thin-walled frame structure of the EMU project side wall according to claim 2, characterized in that, The side wall clamping assembly (3) is connected to the first connecting part (102) at the upper end of the support leg (101); The sidewall clamping assembly (3) includes: The bottom rod (301) of the clamping assembly along the side wall; and The side wall clamping clamping fixture connecting rod (302) is connected to both ends of the bottom rod (301) of the side wall clamping assembly, and the end of the side wall clamping clamping fixture connecting rod (302) is equipped with a side wall clamping fixture (303).

4. The welding process device for the doorway of the thin-walled frame structure of the EMU project side wall according to claim 3, characterized in that, The connection between the bottom rod (301) of the side wall clamping assembly and one of the side wall clamping clamping rods (302) is installed at the first connection part (102) of the base bracket (1); The inclination angle of the side wall upper edge clamping fixture (303) of the side wall upper edge clamping assembly (3) matches the angle of the upper edge (21) of the side wall (20), and the upper and lower surfaces of the upper edge (21) of the side wall (20) are clamped by the side wall upper edge clamping fixture (303) of the side wall upper edge clamping assembly (3); A water-storing and slow-cooling structure (5) is provided between the corresponding side wall upper edge clamping fixtures (303) of the two sets of side wall upper edge clamping assemblies (3) for contacting the corresponding surface of the upper edge (21) of the side wall (20).

5. The welding process device for the doorway of the thin-walled frame structure of the side wall of the EMU project according to claim 1 or 4, characterized in that, The water storage and slow cooling structure (5) is made of aluminum alloy, and the interior of the water storage and slow cooling structure (5) is hollow to form a medium cavity, and the medium cavity is filled with water. The water injection hole of the water storage and slow cooling structure (5) is sealed by a sealing plug.

6. The welding process device for the doorway of the thin-walled frame structure of the side wall of the EMU project according to claim 2, characterized in that, A reinforcing connecting beam (2) is installed on the mounting rod (103), and the upper end of the reinforcing connecting beam (2) is provided with the crossbeam clamping assembly (4); The beam clamping assembly (4) includes: The bottom rod (401) of the beam clamping assembly; and A beam clamping fixture connecting rod (402) is connected to both ends of the bottom rod (401) of the beam clamping assembly, and a beam clamping fixture (403) is provided at the end of the beam clamping fixture connecting rod (402); The connection between the bottom rod (401) of the beam clamping assembly and one of the beam clamping clamp connecting rods (402) is connected to the upper end of the reinforcing connecting beam (2); The beam clamping fixture (403) of the beam clamping assembly (4) is used to contact the outer side of the upper edge (21) of the side wall (20) and the opposite side of the door frame beam (22), and to clamp and position the upper edge (21) and the door frame beam (22) by means of the beam clamping fixture (403).

7. The welding process method for the doorway of the thin-walled frame structure of the side wall in the EMU project, characterized in that, The welding process method is based on the welding process device (10) for the doorway of the thin-walled frame structure of the EMU project side wall as described in any one of claims 1 to 6.

8. The welding process method for the doorway of the thin-walled frame structure of the side wall of the EMU project according to claim 7, characterized in that, The process mainly includes the following steps: S1. After grinding the area to be welded before welding, according to the aluminum alloy material of the thin-walled frame model 6005A-T6 and the parameter requirement that the thickness of the aluminum alloy material is 3mm, perform dense spot welding on the weld seam, and the spacing between the weld spots is 10mm to 15mm, and set the welding parameters. S2. After the weld has cooled to room temperature, grind all the welded areas in step S1 flat, use a cutting tool to cut grooves on the weld points, and process a V-shaped bevel with a depth of 1.5mm to 2mm. S3. Perform secondary welding on the weld seam, and use a segmented welding method with 100mm intervals between welds, and set the welding parameters; S4. After the weld has cooled to room temperature, grind the arc starting and ending points at both ends of the segment weld in step S3. After grinding, use a cutting tool to cut grooves 10mm from both ends of the segment weld to process a V-shaped bevel, and the depth of the V-shaped bevel is 1.5mm to 2mm. S5. Perform three welding operations on the weld seam, welding the weld seam that was left unwelded in the middle section of step S3, and set the welding parameters. S6. After the weld has cooled to room temperature, perform post-weld grinding. S7. After grinding, loosen the clamping device, perform visual inspection and dimensional measurement of the side wall, and mechanically correct the deformed parts to ensure that the overall flatness and local collapse and bending deformation are within 1mm.

9. The welding process method for the doorway of the thin-walled frame structure of the side wall of the EMU project according to claim 8, characterized in that, The welding parameters in step S1 are set as follows: welding current 220A and welding voltage 23V. The welding parameters in step S3 are set as follows: welding current 170A, welding voltage 21V, and welding speed 8.3mm / s. The welding parameters in step S5 are set as follows: welding current 170A, welding voltage 21V, and welding speed 8.3mm / s.

Images