Girth welding special equipment

Abstract

This utility model discloses a special equipment for circumferential seam welding, specifically relating to the field of circumferential seam welding technology. It includes a crossbeam with a welding assembly mounted on it. The welding assembly includes a first sliding plate on one side of the crossbeam, a second sliding plate slidably connected to one side of the first sliding plate, and a cross slide on one side of the second sliding plate. A slide block is slidably connected to one end of the cross slide block. Addressing the welding needs of irregularly shaped parts made of special materials, this equipment integrates pre-weld heating, welding forming, and post-weld heat preservation and stress relief into a single process, completely solving the assembly difficulties caused by separate heat treatment of parts in traditional processes. Pre-weld preheating of the workpiece using an arc-shaped electric heating coil significantly improves the welding performance of special materials, reducing welding defects such as porosity and slag inclusions from the source. Post-weld heat preservation treatment with controlled temperature effectively removes internal welding stress, increasing the stress relief rate compared to traditional processes, while also preventing workpiece deformation caused by residual stress.

Description

Technical Field

[0001] This utility model relates to the field of circumferential weld technology, and more specifically, to special equipment for circumferential weld. Background Technology

[0002] As an indispensable core component in industrial production and people's livelihood, steel pipes are widely used in fluid transportation, structural support, and mechanical parts carriers due to their hollow cross-section characteristics. Based on differences in forming processes, steel pipes are mainly divided into two categories: seamless steel pipes and welded steel pipes. Seamless steel pipes are made through processes such as billet piercing, hot rolling / cold drawing, etc. The pipe wall has no seams and has outstanding pressure-bearing capacity, making them suitable for high-pressure fluid transportation (such as oil and natural gas pipelines), hydraulic systems, and other high-end applications. However, they have limitations such as low production efficiency and high manufacturing costs. Welded steel pipes are made from steel strips or plates as raw materials, which are rolled and welded. They have significant advantages in terms of high production efficiency and controllable costs, making them the most widely used type of steel pipe in industrial and civil fields. Among them, circumferential welded pipes have the same stress direction as the steel pipe body because the weld seam is aligned with the steel pipe body. By reasonably selecting welding processes (such as submerged arc welding, argon arc welding) and welding materials, the tensile strength, yield strength, and other mechanical properties of the weld seam can be made to be comparable to or even better than those of the base material. This effectively avoids the joint becoming a weak link in the pipeline system. Compared with flange connections, circumferential welded joints have no gaps and no stress concentration points, and can withstand higher internal pressure and external loads (such as soil settlement and seismic impact). They have irreplaceable advantages in high-pressure and high-risk media transportation scenarios.

[0003] In the automotive parts industry, some special-material, irregularly shaped parts require a series of requirements, including pre-weld heat treatment to improve weldability, high welding standards, post-weld heat treatment to relieve stress, and reduced post-weld machining to lower costs. These requirements present a series of challenges to production, increasing labor and process costs significantly, and resulting in low yield rates. To meet these requirements, the online assembly problem must first be solved. Parts must be processed separately and cannot be combined and spot-welded before welding, otherwise subsequent welding is prone to porosity and slag inclusions; they must be welded in one go. Secondly, the welding materials are special and require pre-weld heat treatment to improve weldability. If the parts are heat-treated separately, it will cause assembly difficulties, so the online heating problem needs to be solved. During welding, to achieve welding quality and meet the rigidity requirements of the welded parts, a multi-layer, multi-pass welding process is required to achieve the required weld width and depth. After welding, the internal welding stress must be removed without compromising the post-weld precision of the parts. Precise temperature-controlled post-weld heating and heat preservation treatment is required for the welded parts. Therefore, this utility model provides a special equipment for circumferential seam welding to solve the above-mentioned technical problems. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a special equipment for circumferential seam welding, which aims to solve the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a special equipment for circumferential seam welding, including a crossbeam, characterized in that: a welding assembly is provided on the crossbeam; The welding assembly includes a first sliding plate disposed on one side of the crossbeam, a second sliding plate slidably connected to one side of the first sliding plate, a cross slide on one side of the second sliding plate, a slide block slidably connected to one end of the cross slide block, a welding machine disposed on the slide block, a welding torch disposed on the welding machine, and a spring telescopic mechanism disposed on the slide block. The spring telescopic mechanism is used to adjust the welding torch in multiple directions via the cross slide block and the cross slide block, so that the welding torch moves up and down with the roundness of the tube. A bracket is provided at the bottom of the crossbeam, and an adjustable L-plate is slidably connected to the bracket. An electric heating coil for heating the workpiece is provided at one end of the L-plate, and a temperature measuring instrument for detecting the temperature is provided on the L-plate.

[0006] The electric heating coil has an arc-shaped vertical cross-section and is bolted to the L-plate. The L-plate has an L-shaped vertical cross-section to block welding slag. The horizontal section of the L-plate has a through hole to avoid the temperature measurement area, allowing the temperature measuring instrument to detect the workpiece temperature in real time. The welding assembly also includes a support frame at the bottom of the cross slide. The support frame is a rectangular frame structure and has a pneumatic push rod inside. The output end of the pneumatic push rod is equipped with a roller frame, and the roller frame is equipped with rollers for lifting the workpiece. The roller frame and the support frame are slidably connected by a guide rail. The bottom of the support frame is provided with a slider for the support frame to be mounted on the pneumatic slide rail to transport the workpiece. The bottom end of the spring telescopic mechanism is provided with a pressure rod, and the bottom end of the pressure rod is provided with a limit wheel. The pressure rod abuts against the workpiece to position it. The limit wheel at the bottom of the pressure rod and the roller on the roller frame solve the problem of non-roundness affecting the welding process of round tubes. One end of the first slide plate is provided with a mounting bracket. Both the mounting bracket and the first slide plate are slidably connected to the crossbeam through an electric slide rail. One end of the mounting bracket is provided with a pressing cylinder. The technical effects and advantages of this utility model are as follows: This equipment integrates pre-weld heating, welding forming, and post-weld heat preservation and stress relief into a single process, addressing the welding needs of special material and irregularly shaped parts. This completely solves the assembly difficulties caused by separate heat treatment of parts in traditional processes. Pre-weld preheating using an arc-shaped electric heating coil significantly improves the welding performance of special materials, reducing welding defects such as porosity and slag inclusions from the source. Post-weld heat preservation effectively removes internal welding stress, achieving a higher stress relief rate than traditional processes, while also preventing workpiece deformation caused by residual stress. Through the coordinated action of the cross slide and the spring telescopic mechanism, the welding torch achieves multi-directional fine-tuning and adaptive floating. Combined with the positioning structure of the bottom limiting wheel and support roller of the pressure rod, it can dynamically compensate for the non-roundness error of round tubular workpieces, ensuring that the distance between the welding torch and the weld remains constant throughout the welding process. This solves the problem of uneven welding caused by workpiece shape deviations in traditional equipment. Furthermore, the L-shaped plate serves both as a slag barrier and a temperature measurement avoidance device, preventing slag contamination of the workpiece surface while ensuring real-time and accurate temperature monitoring of the workpiece, providing reliable support for closed-loop temperature parameter control. By linking actuators such as electric slide rails, pneumatic push rods, and pressing cylinders with the control system, the entire process of workpiece positioning, heating, welding, heat preservation, and conveying is automated, eliminating the need for manual intervention in key processes. Compared to traditional manual operation, the processing time per workpiece is shortened, while labor input is reduced, significantly lowering labor costs and human error. Furthermore, the integrated process design avoids the transfer and secondary clamping of parts between processes, reducing process connection losses and improving production efficiency. It also eliminates the need for additional dedicated heat treatment equipment and transfer devices, further reducing process costs and space investment. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0008] Figure 1 This is a front view of the overall structure of this utility model.

[0009] Figure 2 This is a side view of the overall structure of this utility model.

[0010] Figure 3 This is a schematic diagram of the welding assembly of this utility model.

[0011] Figure 4 This is a schematic diagram of the support frame, pneumatic push rod, positioning seat and support wheel of this utility model.

[0012] Figure 5 This utility model Figure 3 A partial structural diagram at point A.

[0013] The attached diagram is labeled as follows: 1. Crossbeam; 2. First slide plate; 3. Second slide plate; 4. Cross slide; 5. Slide block; 6. Welding machine; 7. Welding torch; 8. Support; 9. L-plate; 10. Electric heating coil; 11. Support frame; 12. Pneumatic push rod; 13. Roller frame; 14. Roller; 15. Spring telescopic mechanism; 16. Pressure rod; 17. Mounting bracket; 18. Pressing cylinder; 19. Temperature measuring instrument. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Example 1 This embodiment provides a special equipment for circumferential seam welding, which is mainly suitable for circumferential seam welding of special materials and irregularly shaped parts in automotive components. It is especially suitable for scenarios that require pre-weld heating, one-time welding formation, post-weld stress relief, and high welding precision. Its specific structure is as follows: The specialized equipment for circumferential welding includes a crossbeam 1, which serves as the core load-bearing structure of the equipment. Made of high-strength alloy steel, the crossbeam 1 ensures stability and load-bearing capacity during operation. Welding components are integrated onto the crossbeam 1, and a support bracket 8 is bolted to the bottom of the crossbeam 1, further enhancing the overall stability of the equipment.

[0016] The welding assembly includes a first sliding plate 2 disposed on one side of a crossbeam 1. A mounting bracket 17 is mounted at one end of the first sliding plate 2. Both the mounting bracket 17 and the first sliding plate 2 are slidably connected to the crossbeam 1 via an electric slide rail, allowing for precise displacement adjustment of the first sliding plate 2 and the mounting bracket 17 along the length of the crossbeam 1. A pressing cylinder 18 is bolted to one end of the mounting bracket 17, and the output end of the pressing cylinder 18 allows for vertical extension and retraction. A second sliding plate 3 is slidably connected to one side of the first sliding plate 2 via a guide rail. The second sliding plate 3 can slide and adjust along the height of the first sliding plate 2, thereby achieving initial adjustment of the welding height.

[0017] A cross slide 4 is bolted to one side of the second slide plate 3. The cross slide 4 adopts a high-precision linear guide structure, and a slide block 5 is slidably connected to one end of it. The slide block 5 can be finely adjusted in both horizontal and vertical directions along the cross slide 4. A welding machine 6 is fixedly installed on the slide block 5 by a clamping mechanism. The welding machine 6 is a high-frequency argon arc welding machine, and a welding torch 7 for welding is mounted on the welding machine 6. The nozzle of the welding torch 7 is made of ceramic material, which has the characteristics of high temperature resistance and oxidation resistance. A spring telescopic mechanism 15 is also provided on the cross slide 4. The spring telescopic mechanism 15 consists of a telescopic sleeve and an internal spring. A pressure rod 16 is welded to the bottom end of the spring telescopic mechanism 15. The bottom end of the pressure rod 16 is rotatably connected to a limit wheel through a bearing. The limit wheel is made of wear-resistant rubber material.

[0018] Example 2 Based on Embodiment 1, this embodiment also discloses a workpiece support structure. A support frame 11 is provided at the bottom of the cross slide 4. The support frame 11 is a rectangular frame structure, constructed from spliced ​​aluminum alloy profiles, combining lightweight and high strength. A pneumatic push rod 12 is bolted and installed inside the support frame 11. A roller frame 13 is welded and fixed to the output end of the pneumatic push rod 12. A roller 14 for lifting the workpiece is rotatably connected to the roller frame 13 via a rotating shaft. The surface of the roller 14 is provided with anti-slip texture. The roller frame 13 and the support frame 11 are slidably connected via a guide rail, ensuring that the roller frame 13 achieves stable displacement under the drive of the pneumatic push rod 12. A slider is provided at the bottom of the support frame 11, which slides in cooperation with the matching pneumatic slide rail, enabling the support frame 11 to drive the overall conveying of the workpiece. Simultaneously, the limiting wheel at the bottom of the pressure rod 16 and the roller 14 on the roller frame 13 address the impact of non-roundness on the welding process during round tube welding.

[0019] An adjustable L-plate 9 is slidably connected to the bracket 8 via guide rails. The vertical cross-section of the L-plate 9 is L-shaped, and its vertical section can be used to block welding slag generated during the welding process, preventing slag from adhering to the workpiece surface or other parts of the equipment. An electric heating coil 10 is bolted to one end of the L-plate 9. The vertical cross-section of the electric heating coil 10 is arc-shaped, adapted to the outer surface of the cylindrical workpiece, ensuring uniform heating. A temperature measuring instrument 19 for detecting temperature is also fixedly mounted on the L-plate 9 via a mounting base. A through hole is opened through the horizontal section of the L-plate 9. This through hole serves as a temperature measurement avoidance area, allowing the probe end of the temperature measuring instrument 19 to be directly aligned with the workpiece surface, realizing real-time detection of the workpiece temperature.

[0020] The specific working principle is as follows: The special material parts to be welded, such as cylindrical tubes, are first assembled on the mold, and then placed on the rollers 14 of the roller frame 13. The support frame 11 can be adjusted in position via an electric slide rail. The roller frame 13 is driven by a pneumatic push rod 12 to adjust the height of the workpiece, aligning the welding circumference of the workpiece with the welding end of the welding gun 7. The pressing cylinder 18 is activated, pushing the pressure rod 16 downwards, causing the limiting wheel at the bottom of the pressure rod 16 to contact the workpiece surface. This, in conjunction with the rollers 14, achieves precise positioning of the workpiece. Simultaneously, utilizing the rotational characteristics of the limiting wheel and rollers 14, the rotational requirements of the workpiece during welding can be accommodated, effectively solving the impact of non-roundness on welding during cylindrical tube welding.

[0021] Pre-welding heating: According to the welding process requirements, the position of L-plate 9 is adjusted via an electric slide rail so that the electric heating coil 10 is attached to the outer side of the workpiece welding area. The electric heating coil 10 is activated to pre-heat the workpiece. During the heating process, the temperature measuring instrument 19 detects the surface temperature of the workpiece in real time through the through hole in the horizontal section of L-plate 9 and feeds the temperature data back to the control system. When the temperature reaches the preset welding preheating temperature, such as 300-500℃ (the specific temperature is set according to the material characteristics), the electric heating coil 10 automatically maintains a constant temperature.

[0022] Welding Operation: The welding machine 6 and related displacement adjustment mechanisms are started. The first slide plate 2 moves along the length of the crossbeam 1 via an electric slide rail, and the second slide plate 3 moves along the height of the first slide plate 2. This, combined with the cross slide 4 driving the slide block 5, enables multi-directional fine-tuning of the welding torch 7, ensuring precise alignment of the welding torch 7 with the weld circumferential seam. Simultaneously, the spring telescopic mechanism 15 adaptively extends and retracts according to changes in the roundness of the workpiece, causing the welding torch 7 to float up and down with the roundness of the tube, ensuring that the distance between the welding torch 7 and the workpiece surface remains consistent throughout the welding process. For workpieces requiring multi-layer, multi-pass welding, the equipment automatically completes the welding of multiple weld seams by preset welding parameters through the control system, meeting the requirements for welding width and depth.

[0023] Post-weld heat preservation and stress relief: After welding, the electric heating coil 10 is kept in operation. The heating temperature and holding time are adjusted according to the stress relief process requirements. The workpiece temperature is monitored in real time by the temperature measuring instrument 19 to ensure that the workpiece is kept at the preset temperature, effectively removing the internal stress generated during welding. After the heat preservation is completed, the electric heating coil 10 is gradually cooled to avoid secondary stress or deformation of the workpiece due to excessive cooling, thus ensuring the post-weld accuracy of the parts.

[0024] Workpiece unloading: After the workpiece has cooled to a safe temperature, turn off all heating and welding equipment, start the pressing cylinder 18 to drive the pressure rod 16 to reset, and release the welded workpiece through the pneumatic slide rail driven support frame 11, thus completing the entire welding operation process. The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A special equipment for circumferential welding, including a crossbeam (1), characterized in that: The crossbeam (1) is provided with welding components; The welding assembly includes a first slide plate (2) disposed on one side of the crossbeam (1), a second slide plate (3) slidably connected to one side of the first slide plate (2), a cross slide (4) disposed on one side of the second slide plate (3), a slide block (5) slidably connected to one end of the cross slide (4), a welding machine (6) disposed on the slide block (5), a welding torch (7) for welding disposed on the welding machine (6), and a spring telescopic mechanism (15) disposed on the slide block (4). The cross slide (4) and the spring telescopic mechanism (15) are used to adjust the welding torch (7) in multiple directions, so that the welding torch (7) moves up and down with the roundness of the tube. The bottom of the crossbeam (1) is provided with a bracket (8), and an adjustable L plate (9) is slidably connected on the bracket (8). One end of the L plate (9) is provided with an electric heating coil (10) for heating the workpiece, and a temperature measuring instrument (19) for detecting temperature is provided on the L plate (9).

2. The special equipment for circumferential welding according to claim 1, characterized in that: The vertical cross-sectional shape of the electric heating coil (10) is set to arc shape, and the electric heating coil (10) is mounted on the L plate (9) by bolts.

3. The special equipment for circumferential welding according to claim 1, characterized in that: The vertical cross-sectional shape of the L plate (9) is set to L-shape to block welding slag, and the horizontal section of the L plate (9) is provided with through holes to avoid the temperature measurement area, so that the temperature measuring instrument (19) can detect the temperature of the workpiece in real time.

4. The special equipment for circumferential welding according to claim 1, characterized in that: The welding assembly also includes a support frame (11) at the bottom of the cross slide (4), the support frame (11) is a rectangular frame structure, and a pneumatic push rod (12) is provided inside the support frame (11).

5. The special equipment for circumferential welding according to claim 4, characterized in that: The output end of the pneumatic push rod (12) is provided with a roller frame (13), and the roller frame (13) is provided with a roller (14) for lifting the workpiece.

6. The special equipment for circumferential welding according to claim 5, characterized in that: The roller frame (13) and the support frame (11) are slidably connected by a guide rail. The bottom of the support frame (11) is provided with a slider for the support frame (11) to support the workpiece by moving on the pneumatic slide rail.

7. The special equipment for circumferential welding according to claim 1, characterized in that: The bottom end of the spring telescopic mechanism (15) is provided with a pressure rod (16), and the bottom end of the pressure rod (16) is provided with a limiting wheel. The pressure rod (16) abuts against the workpiece to position the workpiece. The limiting wheel at the bottom of the pressure rod (16) and the roller (14) on the roller frame (13) solve the problem of non-roundness affecting the welding process of round tubes.

8. The special equipment for circumferential welding according to claim 1, characterized in that: The first slide plate (2) is provided with a mounting bracket (17) at one end. The mounting bracket (17) and the first slide plate (2) are slidably connected to the crossbeam (1) via an electric slide rail. The mounting bracket (17) is provided with a pressing cylinder (18) at one end.

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