A method for welding a railway wagon side wall sheet

Abstract

The present application discloses a kind of welding methods of railway wagon side wall sheet, comprising the following steps: the side wall plate to be spliced is hoisted to welding platform, ensure that the splicing gap formed at the splicing of two side wall plates is uniform;Then open the compacting device, compact the side wall plate on the welding platform;Start the automatic welding trolley, and weld the splicing between the two side wall plates, using the welding method of single-sided welding double-sided forming;After welding, keep the compacting device compact the side wall plate for a period of time before loosening.The beneficial effects of the present application: greatly reduce the flatness of the side wall plate after welding caused by sheet welding deformation;The butt joint of side wall plate is single-sided welding double-sided forming, and the quality of weld is guaranteed;Tooling is simple and low in cost, effectively reduces the labor intensity of welder, improves the welding production efficiency;According to the thickness of the plate, the diameter of the welding wire and the welding parameters can be adjusted appropriately, and it is suitable for the welding of 1.5-3mm sheet.

Description

Technical Field

[0001] This invention belongs to the field of railway freight car manufacturing technology, and specifically relates to a welding method for thin side wall plates of railway freight cars. Background Technology

[0002] The sidewalls of railway freight cars are generally composed of sidewall panels or sidewall panels welded to a frame. If the butt joints of 3mm thin plates are welded using a double-sided welding process with gas metal arc welding (MAG welding), the welding workload is large, and it will be difficult to guarantee the flatness of the welded sidewall panels. Correcting the flatness of the thin plates is also labor-intensive and time-consuming, and the correction effect is often unsatisfactory, making it difficult to meet the product's technical requirements and seriously affecting production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a welding method for thin sidewall plates of railway freight cars, solving the problem of poor welding results in existing railway freight car sidewall plates. This invention achieves efficient welding of 3mm weathering steel sidewall plates using a simple forced welding fixture, enabling single-sided welding and double-sided forming. The weld meets quality requirements, and the welded sidewall plate exhibits minimal deformation and flatness that meets product technical requirements. This welding method is simple, practical, and economically significant.

[0004] This invention, combined with thin-plate welding technical parameters derived through numerous welding experiments, enables single-sided welding and double-sided forming of 3mm weathering steel thin plates, with minimal welding deformation. The objective of this invention is achieved through the following technical solution:

[0005] A welding method for thin sidewall plates of railway freight cars includes the following steps:

[0006] S1. Hoist the side wall panels to be spliced ​​onto the welding platform to ensure that the splicing gap between the two side wall panels is uniform.

[0007] S2, then open the clamping device and press the side wall panel onto the welding platform;

[0008] S3, start the automatic welding carriage to weld the joint between the two side wall panels, using a single-sided welding and double-sided forming welding method;

[0009] S4. After welding is completed, keep the clamping device pressing the side wall panel for a period of time before releasing it.

[0010] Furthermore, the side wall panel is a 3mm thick weathering steel sheet.

[0011] Furthermore, in S1, the two ends of the splice are plugged with a clamp to ensure that the splice gap is uniformly 0.5-1mm; in S2, the clamp is removed after the side wall panel is pressed.

[0012] Furthermore, in S3, the welding parameters are as follows: the groove type is I-type groove; the welding wire is a solid welding wire with a diameter of 1.1 to 1.3 mm; the welding current is 210A-220A, the current type / polarity is DCEP / +, the welding voltage is 24-25V; the welding speed is 50 to 60 cm / min; the shielding gas is M21 mixed gas, and the gas flow rate is 15 to 25 L / min.

[0013] Furthermore, in S4, the opposite side wall panels are kept pressed for 1 to 3 minutes before being released.

[0014] Furthermore, a movable gantry is provided above the welding platform, and the movable gantry moves on gantry tracks on both sides of the platform.

[0015] Furthermore, the clamping device follows the horizontal movement of the movable gantry above the welding platform.

[0016] Furthermore, the clamping device includes a clamping drive assembly and a clamping contact assembly, wherein the clamping drive assembly is a cylinder type and the clamping contact assembly is a spring type.

[0017] Furthermore, the automatic welding trolley follows the horizontal movement of the movable gantry above the welding platform.

[0018] Furthermore, the welding platform is equipped with pads, the side wall panels are placed on the pads, the joints are staggered from the pads vertically, and the clamping device is vertically aligned with the pads during the clamping operation.

[0019] The beneficial effects of this invention are:

[0020] 1. It greatly reduces the unevenness of the side wall panel after welding caused by the deformation of thin plate welding.

[0021] 2. The butt welds of the side wall panels are single-sided welded and double-sided formed, ensuring weld quality.

[0022] 3. The tooling is simple to manufacture and has a low cost, which effectively reduces the labor intensity of welders and improves welding production efficiency.

[0023] 4. The welding wire diameter and welding parameters can be adjusted appropriately according to the plate thickness, making it suitable for welding thin plates in the range of 1.5-3mm.

[0024] The aforementioned main solution of the present invention and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed by the present invention; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding the solution of the present invention, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected by the present invention, and will not be exhaustively listed here. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] In the diagram: 1-Movable gantry, 2-Automatic welding trolley, 3-Pressure device, 4-Side wall panel, 5-Padded block, 6-Welding platform, 7-Gantry track. Detailed Implementation

[0027] The following non-limiting examples are used to illustrate the present invention.

[0028] Example 1:

[0029] refer to Figure 1 As shown, a welding method for a thin side wall plate of a railway freight car is provided. The side wall plate 4 is a weathering steel plate with a thickness of 1.5-3mm (preferably 3mm). The method includes the following steps: S1, the side wall plates 4 to be spliced ​​are hoisted onto the welding platform 6 to ensure that the splicing gap formed at the splicing point of the two side wall plates 4 is uniform. Specifically, the two ends of the splicing point are plugged with a clamp (0.5-1mm, preferably 1mm) to ensure that the splicing gap is uniform at 0.5-1mm (preferably 1mm).

[0030] S2, then open the clamping device 3, the clamping device 3 descends and presses the side wall plate 4 onto the welding platform 6. After the side wall plate 4 is pressed, take out the clamp to perform welding operation at the splice.

[0031] S3, start the automatic welding carriage 2 (MAG) to weld the joint between the two side wall panels 4, using a single-sided welding and double-sided forming welding method.

[0032] Welding parameters: Type I bevel; solid welding wire with a diameter of 1.1–1.3 mm (preferably 1.2 mm); welding current 210A–220A, current type / polarity DCEP / +; welding voltage 24–25V; welding speed 50–60 cm / min (preferably 55 cm / min); shielding gas M21 (80% Ar + 20% CO2) mixture, gas flow rate 15–25 L / min (preferably 20 L / min). A 1 mm gap between the sidewall panels, combined with the above welding parameters, is a reasonable combination to ensure double-sided weld formation. These welding parameters are crucial for the single-sided welding of 3 mm weathering steel sidewall plates to achieve double-sided formation.

[0033] S4. After welding, according to the production cycle requirements, keep the clamping device 3 clamping the side wall plate for 1 to 3 minutes (preferably 2 minutes) before releasing it. The flatness of the side wall plate after welding will be better.

[0034] A movable gantry 1 is provided above the welding platform 6. The movable gantry 1 travels on the gantry tracks 7 on both sides of the platform. The movable gantry 1 can be used to conveniently hoist the side wall panel 4, as well as carry other devices and equipment for welding or pressing operations.

[0035] The clamping device 3 moves horizontally along with the movable gantry 1 above the welding platform 6. The movable gantry 1 then moves the clamping device 3 to the top of the splicing point to clamp the end of the side wall panel 4 to be spliced. The clamping device 3 includes a clamping drive assembly and a clamping contact assembly. The clamping drive assembly is a cylinder type, which realizes the vertical extension and retraction of the device. The clamping contact assembly is a spring type, which realizes the elastic clamping effect on the side wall panel 4.

[0036] The cylinder of the clamping drive assembly is connected to the gantry beam. The clamping contact assembly consists of several sets of spring-loaded pressure heads (each set spaced 200mm apart), ensuring that each pressure head applies clamping force to the side wall plate. The number of pressure heads can be adjusted according to the width of the side wall to be welded. The elastic clamping device is key to minimizing welding deformation of the thin side wall plates.

[0037] The automatic welding trolley 2 moves horizontally along the movable gantry 1 above the welding platform 6. The movable gantry 1 then moves the automatic welding trolley 2 to the top of the joint to perform welding operations on the joint gap. The automatic welding trolley 2 is located in the middle, directly facing the joint, and two clamping devices 3 are located on both sides, targeting the ends of the two side wall panels 4.

[0038] The welding platform 6 is equipped with pads 5, and the side wall panel 4 is placed on the pads 5, thus supporting the side wall panel 4. The joints are staggered vertically from the pads 5, leaving space below the joints to facilitate welding. When the clamping device 3 is in operation, it is positioned vertically opposite the pads 5, thus supporting the clamped area and preventing the clamping device 3 from bending or deforming the side wall panel 4.

[0039] The beneficial effects of this invention are:

[0040] 1. It greatly reduces the unevenness of the side wall panel after welding caused by the deformation of thin plate welding.

[0041] 2. The butt welds of the side wall panels are single-sided welded and double-sided formed, ensuring weld quality.

[0042] 3. The tooling is simple to manufacture and has a low cost, which effectively reduces the labor intensity of welders and improves welding production efficiency.

[0043] 4. The welding wire diameter and welding parameters can be adjusted appropriately according to the plate thickness, making it suitable for welding thin plates in the range of 1.5-3mm.

[0044] The foregoing basic examples and their further alternative examples of the present invention can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and are claimed by the present invention. In the present invention, each alternative example can be arbitrarily combined with any other basic example and alternative example.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding method for thin sidewall plates of railway freight cars, characterized in that, Includes the following steps: S1, hoist the side wall panels (4) to be spliced ​​onto the welding platform (6) to ensure that the splicing gap formed at the splicing point of the two side wall panels (4) is uniform; S2, then open the clamping device (3) and press the side wall plate (4) onto the welding platform (6); S3, start the automatic welding trolley (2) and weld the joint between the two side wall panels (4) using a single-sided welding double-sided forming welding method; S4. After welding, keep the clamping device (3) clamping the side wall plate (4) for a period of time before releasing it. The side wall plate (4) is a 3mm thick weathering steel sheet; the splicing gap is uniformly 0.5-1mm; in S3, the welding parameters are: the groove type is I-type groove; the welding wire is a solid welding wire with a diameter of 1.1~1.3mm; the welding current is 210A-220A, the current type / polarity is DCEP / +, the welding voltage is 24-25V; the welding speed is 50~60 cm / min; the shielding gas is M21 mixed gas, and the gas flow rate is 15~25 L / min; The welding platform (6) is provided with a movable gantry (1) above it, and the movable gantry (1) moves on the gantry tracks (7) on both sides of the platform; the pressing device (3) moves horizontally following the movable gantry (1) above the welding platform (6); the automatic welding trolley (2) moves horizontally following the movable gantry (1) above the welding platform (6); the welding platform (6) is provided with a pad (5), and the side wall plate (4) is placed on the pad (5). The splice is staggered from the pad (5) vertically. When the pressing device (3) is pressing, it is vertically opposite to the pad (5).

2. The welding method for the thin side wall plate of railway freight cars according to claim 1, characterized in that: In S1, the two ends of the splice are plugged with a clamp to ensure that the splice gap is uniformly 0.5-1mm; in S2, the clamp is removed after the side wall plate (4) is pressed.

3. The welding method for the thin side wall plate of railway freight cars according to claim 1, characterized in that: In S4, the opposite side wall panel (4) is pressed for 1~3 minutes and then released.

4. The welding method for the thin side wall plate of railway freight cars according to claim 1, characterized in that: The clamping device (3) includes a clamping drive assembly and a clamping contact assembly. The clamping drive assembly is a cylinder type and the clamping contact assembly is a spring type.

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