A welding device for reducing welding stress

Abstract

This utility model relates to the field of welding equipment technology, specifically to a welding device for reducing welding stress, comprising: a ground rail, with two electrically driven roller frames at each end of the ground rail; a welding robot mounted on one side of the center of the ground rail; a longitudinal linear drive assembly mounted on the other side of the center of the ground rail; a transverse linear drive assembly connected to the longitudinal linear drive assembly; a support frame connected to the transverse linear drive assembly; an L-shaped fixing frame connected to the top of the support frame; and an ultrasonic impact device mounted on the L-shaped fixing frame. It also includes a laser preheating device and a lifting laser heating device. The laser preheating device is located at the center of the ground rail, and the lifting laser heating device is connected to the longitudinal linear drive assembly and extends directly above the laser preheating device. This utility model has a reasonable structure and solves the problems of difficulty in eliminating welding stress and poor stress elimination effect for large components.

Description

Technical Field

[0001] This utility model relates to the field of welding equipment technology, and in particular to a welding device for reducing welding stress. Background Technology

[0002] Wind power generation is a clean energy utilization method that converts the kinetic energy of wind into electrical energy. Its principle is that wind power drives the wind turbine blades to rotate, and the speed increaser drives the generator to operate, ultimately feeding the generated electricity into the power grid to provide power support for social production and daily life. In a wind power generation system, the wind turbine tower, as a core supporting component, not only bears the load of the wind turbine generator but also effectively absorbs the vibrations generated during operation, ensuring stable equipment operation. During the manufacturing process of wind turbine towers, limited by the size specifications of individual steel plates, each tower body needs to be assembled from multiple single sections. The connection between adjacent sections mainly relies on welding. However, after welding, significant welding stress often remains at the joints. If this stress is not eliminated in time, it can easily lead to defects such as cracks and deformation at the weld, seriously affecting the structural strength and overall quality of the tower.

[0003] To address this problem, the inventors discovered that traditional stress relief methods have significant limitations when dealing with large cylindrical components such as towers: overall heat treatment methods are extremely energy-intensive and have stringent equipment requirements, making them unsuitable for on-site welding of large components; manual hammering methods are inefficient, not only because it is difficult to control the force evenly, but also because they are highly dependent on the skill level of the operator, making it impossible to guarantee consistent stress relief results. Therefore, designing a specialized device that combines welding functionality with stress relief capabilities has become the key to solving the above problems. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a welding device that reduces welding stress, thereby solving the problems of difficulty in eliminating welding stress and poor effect in eliminating welding stress for large components.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a welding device for reducing welding stress is provided, comprising: a ground rail, two electric walking roller frames respectively provided at both ends of the ground rail, a welding robot provided on one side of the center of the ground rail, a longitudinal linear drive component provided on the other side of the center of the ground rail, a transverse linear drive component connected to the longitudinal linear drive component, a support frame connected to the transverse linear drive component, an L-shaped fixing frame connected to the top of the support frame, and an ultrasonic impact device installed on the L-shaped fixing frame;

[0006] It also includes a laser preheating device and a lifting laser heating device. The laser preheating device is located at the center of the ground rail, and the lifting laser heating device is connected to the longitudinal linear drive assembly and extends directly above the laser preheating device.

[0007] By adopting the above technical solution, during use, the single-section cylinder to be welded is first placed on the corresponding two sets of electric traveling roller frames. The position of the cylinder is adjusted by operating the electric traveling roller frames so that the joint of adjacent single-section cylinders is aligned directly above the center of the ground rail. Then, the electric traveling roller frames are activated to drive the cylinder to rotate at a uniform speed, while the laser preheating device is turned on to preheat the joint of the cylinder, raising the base temperature of the area to be welded. During this process, the welding robot starts simultaneously, performing circumferential welding on the preheated joint. By reducing the instantaneous temperature difference between the area to be welded and the welding process through preheating, the root cause of thermal stress can be significantly reduced. Simultaneously, the lifting laser heating device works synchronously, continuously heating the weld that has just been welded, thereby slowing down the cooling rate of the weld. The synergistic effect of the laser preheating device and the lifting laser heating device optimizes the solidification structure of the weld metal and effectively alleviates the accumulation of welding residual stress from the source of thermal circulation. After the weld has cooled for a certain period, the longitudinal linear drive assembly is operated to move the transverse linear drive assembly, support frame, L-shaped fixing frame, and ultrasonic impact device as a whole, aligning the impact head of the ultrasonic impact device with one side of the weld. The transverse linear drive assembly is then fine-tuned to ensure the impact head makes close contact with the weld toe on one side of the weld. At this point, the ultrasonic impact device is activated, using high-frequency impact to induce compressive plastic deformation at the weld toe. This not only reduces stress concentration caused by weld toe excess height and pits but also eliminates micro-cracks and slag defects on the weld toe surface, thereby relieving welding stress. After one side is treated, the longitudinal linear drive assembly 40 and the transverse linear drive assembly are operated again to precisely align the impact head with the weld toe on the other side of the weld, repeating the impact process to completely eliminate residual stress on both sides of the weld. This operating method not only significantly improves the stress relief effect but also flexibly adapts to the welding stress treatment needs of large cylindrical components.

[0008] In a preferred embodiment, the present invention can be further configured as follows: the longitudinal linear drive assembly includes a base plate and a longitudinal lead screw connected to the upper surface of the base plate; longitudinal guide rails are respectively provided on both sides of the longitudinal lead screw; the transverse linear drive assembly is connected between the longitudinal guide rails; the longitudinal lead screw includes a longitudinal lead screw body and a mounting seat rotatably connected to its two ends; the mounting seat is connected to the base plate; a nut seat is helically connected to the longitudinal lead screw body; the nut seat is connected to the transverse linear drive assembly; and a circular handle is connected to one end of the longitudinal lead screw body.

[0009] By adopting the above technical solution, the circular handle drives the longitudinal lead screw to rotate, and the longitudinal lead screw drives the transverse linear drive assembly to move through the nut seat, thereby adjusting the longitudinal position of the ultrasonic impact device, which facilitates stress relief at the weld toe on both sides of the weld.

[0010] In a preferred embodiment, the present invention can be further configured as follows: the transverse linear drive assembly includes a movable plate and a transverse lead screw connected to its upper surface. Transverse guide rails fixed to the movable plate are respectively provided on both sides of the transverse lead screw. The support frame is connected between the transverse guide rails. The transverse lead screw includes a transverse lead screw body and mounting seats rotatably connected to its two ends. The mounting seats are connected to the movable plate. A nut seat is helically connected to the transverse lead screw body and is connected to the support frame. A circular handle is connected to one end of the transverse lead screw body.

[0011] By adopting the above technical solution, the second circular handle drives the transverse lead screw to rotate. The transverse lead screw drives the support frame, L-shaped fixing frame and ultrasonic impact device to move towards the cylinder through the second mounting base, so that the impact head on the ultrasonic impact device can contact the weld toe on the weld side, thereby achieving the purpose of stress elimination.

[0012] In a preferred embodiment, the present invention can be further configured such that: the laser preheating device includes an L-shaped mounting plate and a laser heater connected to the horizontal side of the L-shaped mounting plate; the lower end of the vertical side of the L-shaped mounting plate is connected to the ground rail; and the laser lens of the laser heater points upward.

[0013] By adopting the above technical solution, the laser heater is connected to the ground rail through an L-shaped mounting plate, so that the laser heater is in a stable height position. The laser heater works by heating through the joint of the laser lens to achieve the purpose of preheating.

[0014] In a preferred embodiment, the present invention can be further configured as follows: the lifting laser heating device includes a U-shaped fixing frame and a strip plate, the lower end of the U-shaped fixing frame is connected to a longitudinal linear drive assembly, one end of the strip plate is connected to the U-shaped fixing frame, and a vertical drive rod is installed on the upper surface of the other end. The lower end of the vertical drive rod is connected to the laser heater, and the laser lens on the laser heater points downward.

[0015] By adopting the above technical solution, the vertical drive rod is operated to lower the laser heater to a certain height. The laser heater heats the weld through the laser lens, reducing the cooling rate of the weld and thus reducing the generation of stress.

[0016] In a preferred embodiment, the present invention can be further configured as follows: the vertical drive rod includes an electric push rod and a movable mounting plate connected to its extended end; the lower surface of the movable mounting plate is connected to the laser heater; guide rods are provided on both sides of the electric push rod; the guide rods are mounted on the strip plate and their lower ends are connected to the movable mounting plate.

[0017] By adopting the above technical solution, the telescopic rod of the electric push rod extends, thereby driving the laser heater closer to the weld seam, which facilitates the heating of the weld seam; the use of the guide rod enhances the stability of the laser heater during movement and operation.

[0018] In summary, this utility model has at least one of the following beneficial technical effects:

[0019] 1. Activate the laser preheating device to preheat the joint of the cylinder body, raising the base temperature of the area to be welded. During this process, the welding robot starts simultaneously to perform circumferential welding on the preheated joint. By reducing the instantaneous temperature difference between the area to be welded and the welding process through the preheating stage, the root cause of thermal stress can be significantly reduced.

[0020] 2. The lifting laser heating device works synchronously to continuously heat the weld that has just been welded, thereby slowing down the cooling rate of the weld and reducing the generation of welding stress.

[0021] 3. By coordinating the longitudinal and transverse linear drive components, the impact head can precisely engage the weld toes on both sides of the weld, thereby completely eliminating residual stress on both sides of the weld. This operation method not only significantly improves the stress relief effect, but also flexibly adapts to the welding stress treatment needs of large cylindrical components. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0023] Figure 1 This is a schematic diagram of a preferred embodiment of a welding device for reducing welding stress according to the present invention.

[0024] Figure 2 This is another structural schematic diagram of the present invention.

[0025] Figure 3 yes Figure 1 A schematic diagram of the longitudinal linear drive component.

[0026] Figure 4 yes Figure 1 A schematic diagram of the structure of the transverse linear drive component.

[0027] Figure 5 yes Figure 1 A schematic diagram of the structure of the laser preheating device.

[0028] Figure 6 yes Figure 1 A schematic diagram of the structure of a lifting laser heating device.

[0029] In the diagram: 1. Ground rail; 2. Electric walking roller frame; 3. Welding robot; 40. Longitudinal linear drive assembly; 50. Lateral linear drive assembly; 6. Support frame; 70. Laser preheating device; 80. Lifting laser heating device; 11. L-shaped fixing frame; 12. Ultrasonic impact equipment;

[0030] 41. Base plate; 42. Longitudinal lead screw; 43. Longitudinal guide rail; 421. Longitudinal lead screw body; 422. Mounting base one; 423. Nut seat one; 424. Circular handle one;

[0031] 51. Moving plate; 52. Transverse lead screw; 53. Transverse guide rail; 521. Transverse lead screw body; 522. Mounting base two; 523. Nut seat two; 524. Circular handle two;

[0032] 71. L-shaped mounting plate; 72. Laser heater;

[0033] 81. U-shaped fixing frame; 82. Strip plate; 83. Vertical drive rod; 831. Electric push rod; 832. Movable mounting plate; 833. Guide rod. Detailed Implementation

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0036] Reference Figures 1-6The present invention discloses a welding device for reducing welding stress, comprising: a ground rail 1, two electric walking roller frames 2 at each end of the ground rail 1, a welding robot 3 on one side of the center of the ground rail 1, a longitudinal linear drive assembly 40 on the other side of the center of the ground rail 1, a transverse linear drive assembly 50 connected to the longitudinal linear drive assembly 40, a support frame 6 connected to the transverse linear drive assembly 50, an L-shaped fixing frame 11 connected to the top of the support frame 6, and an ultrasonic impact device 12 installed on the L-shaped fixing frame 11.

[0037] The longitudinal linear drive assembly 40 includes a base plate 41 and a longitudinal lead screw 42 connected to the upper surface of the base plate 41. Longitudinal guide rails 43 are respectively provided on both sides of the longitudinal lead screw 42, and the transverse linear drive assembly 50 is connected between the longitudinal guide rails 43. The longitudinal lead screw 42 includes a longitudinal lead screw body 421 and mounting seats 422 rotatably connected to its two ends. The mounting seats 422 are connected to the base plate 41. A nut seat 423 is helically connected to the longitudinal lead screw body 421 and is connected to the transverse linear drive assembly 50. A circular handle 424 is connected to one end of the longitudinal lead screw body 421. Operating the circular handle 424 rotates the longitudinal lead screw body 421, which in turn drives the transverse linear drive assembly 50 to move via the nut seat 423, thereby adjusting the longitudinal position of the ultrasonic impact device 12 and facilitating stress relief at the weld toes on both sides of the weld.

[0038] The transverse linear drive assembly 50 includes a movable plate 51 and a transverse lead screw 52 connected to its upper surface. Transverse guide rails 53, fixed to the movable plate 51, are respectively provided on both sides of the transverse lead screw 52. The support frame 6 is connected between the transverse guide rails 53. The transverse lead screw 52 includes a transverse lead screw body 521 and mounting seats 522 rotatably connected to its two ends. The mounting seats 522 are connected to the movable plate 51. A nut seat 523 is spirally connected to the transverse lead screw body 521 and is connected to the support frame 6. A circular handle 524 is connected to one end of the transverse lead screw body 521. Operating the circular handle 524 rotates the transverse lead screw body 521. The transverse lead screw body 521, through the mounting seats 522, moves the support frame 6, the L-shaped fixing frame 11, and the ultrasonic impact device 12 towards the cylinder, facilitating contact between the impact head of the ultrasonic impact device 12 and the weld toe on the weld side, thereby achieving stress relief.

[0039] It also includes a laser preheating device 70 and a lifting laser heating device 80. The laser preheating device 70 is located at the center of the ground rail 1, and the lifting laser heating device 80 is connected to the longitudinal linear drive assembly 40 and extends directly above the laser preheating device 70.

[0040] The laser preheating device 70 includes an L-shaped mounting plate 71 and a laser heater 72 connected to the horizontal side of the L-shaped mounting plate 71. The lower end of the vertical side of the L-shaped mounting plate 71 is connected to the ground rail 1, and the laser lens of the laser heater 72 points upward. The laser heater 72 is connected to the ground rail 1 through the L-shaped mounting plate 71, which keeps the laser heater 72 at a stable height. The laser heater 72 heats the laser through the joint of the laser lens to achieve the purpose of preheating.

[0041] The lifting laser heating device 80 includes a U-shaped fixing frame 81 and a strip plate 82. The lower end of the U-shaped fixing frame 81 is connected to the longitudinal linear drive assembly 40. One end of the strip plate 82 is connected to the U-shaped fixing frame 81, and a vertical drive rod 83 is mounted on the upper surface of the other end. The lower end of the vertical drive rod 83 is connected to the laser heater 72, and the laser lens on the laser heater 72 points downward. Operating the vertical drive rod 83 causes the laser heater 72 to descend a certain height. The laser heater 72 heats the weld seam through the laser lens, reducing the cooling rate of the weld seam and thus reducing stress generation.

[0042] The vertical drive rod 83 includes an electric push rod 831 and a movable mounting plate 832 connected to its extended end. The laser heater 72 is connected to the lower surface of the movable mounting plate 832. Guide rods 833 are provided on both sides of the electric push rod 831. The guide rods 833 are mounted on the strip plate 82 and their lower ends are connected to the movable mounting plate 832. The extension rod of the electric push rod 831 extends, thereby driving the laser heater 72 closer to the weld, facilitating the heating of the weld. The use of guide rods 833 enhances the stability of the laser heater 72 during movement and operation.

[0043] The implementation principle of this embodiment is as follows: During use, the single-section cylinder to be welded is first placed on the corresponding two sets of electric traveling roller frames 2. By operating the electric traveling roller frames 2, the position of the cylinder is adjusted so that the joint of adjacent single-section cylinders is aligned directly above the center of the ground rail 1. Then, the electric traveling roller frames 2 are started to drive the cylinder to rotate at a uniform speed, while the laser preheating device 70 is activated to preheat the joint of the cylinder, raising the base temperature of the area to be welded. During this process, the welding robot 3 is simultaneously activated to perform circumferential welding on the preheated joint. By reducing the instantaneous temperature difference between the area to be welded and the welding process through the preheating stage, the root cause of thermal stress can be significantly reduced. Simultaneously, the lifting laser heating device 80 works synchronously to continuously heat the weld that has just been welded, thereby slowing down the cooling rate of the weld. The synergistic effect of the laser preheating device 70 and the lifting laser heating device 80 can optimize the solidification structure of the weld metal and effectively alleviate the accumulation of welding residual stress from the source of thermal circulation. After the weld has cooled for a certain period of time, the longitudinal linear drive assembly 40 is operated to move the transverse linear drive assembly 50, support frame 6, L-shaped fixing frame 11, and ultrasonic impact device 12 as a whole, aligning the impact head of the ultrasonic impact device 12 with one side of the weld. The transverse linear drive assembly 50 is then finely adjusted to ensure close contact between the impact head and the weld toe on one side of the weld. At this point, the ultrasonic impact device 12 is activated, using high-frequency impact to induce compressive plastic deformation in the weld toe area. This not only reduces stress concentration caused by weld toe excess height and pits but also eliminates micro-cracks and slag defects on the weld toe surface, thereby relieving welding stress. After one side is treated, the longitudinal linear drive assembly 40 and transverse linear drive assembly 50 are operated again to precisely align the impact head with the weld toe on the other side of the weld, repeating the impact process to completely eliminate residual stress on both sides of the weld. This operation method not only significantly improves the stress relief effect but also flexibly adapts to the welding stress treatment needs of large cylindrical components.

[0044] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A welding apparatus that reduces welding stresses, comprising: A ground rail (1) is provided with two electric walking roller frames (2) at both ends of the ground rail (1), and a welding robot (3) is provided on one side of the center of the ground rail (1). The ground rail (1) is characterized in that a longitudinal linear drive assembly (40) is provided on the other side of the center of the ground rail (1), a transverse linear drive assembly (50) is connected to the longitudinal linear drive assembly (40), a support frame (6) is connected to the transverse linear drive assembly (50), an L-shaped fixing frame (11) is connected to the top of the support frame (6), and an ultrasonic impact device (12) is installed on the L-shaped fixing frame (11). It also includes a laser preheating device (70) and a lifting laser heating device (80), the laser preheating device (70) being located at the center of the ground rail (1), and the lifting laser heating device (80) being connected to the longitudinal linear drive assembly (40) and extending directly above the laser preheating device (70).

2. The weld apparatus to reduce weld stresses of claim 1, wherein, The longitudinal linear drive assembly (40) includes a base plate (41) and a longitudinal lead screw (42) connected to the upper surface of the base plate (41). The longitudinal lead screw (42) has longitudinal guide rails (43) on both sides. The transverse linear drive assembly (50) is connected between the longitudinal guide rails (43). The longitudinal lead screw (42) includes a longitudinal lead screw body (421) and a mounting seat (422) rotatably connected to its two ends. The mounting seat (422) is connected to the base plate (41). A nut seat (423) is screwed onto the longitudinal lead screw body (421). The nut seat (423) is connected to the transverse linear drive assembly (50). A circular handle (424) is connected to one end of the longitudinal lead screw body (421).

3. The weld apparatus to reduce weld stresses of claim 1, wherein, The transverse linear drive assembly (50) includes a movable plate (51) and a transverse lead screw (52) connected to its upper surface. The transverse lead screw (52) has transverse guide rails (53) fixed on the movable plate (51) on both sides. The support frame (6) is connected between the transverse guide rails (53). The transverse lead screw (52) includes a transverse lead screw body (521) and mounting seats (522) rotatably connected to its two ends. The mounting seats (522) are connected to the movable plate (51). A nut seat (523) is spirally connected to the transverse lead screw body (521). The nut seat (523) is connected to the support frame (6). A circular handle (524) is connected to one end of the transverse lead screw body (521).

4. The weld apparatus to reduce weld stresses of claim 1, wherein, The laser preheating device (70) includes an L-shaped mounting plate (71) and a laser heater (72) connected to the horizontal side of the L-shaped mounting plate (71). The lower end of the vertical side of the L-shaped mounting plate (71) is connected to the ground rail (1), and the laser lens of the laser heater (72) points upward.

5. The weld apparatus to reduce weld stresses of claim 4, wherein, The lifting laser heating device (80) includes a U-shaped fixing frame (81) and a strip plate (82). The lower end of the U-shaped fixing frame (81) is connected to the longitudinal linear drive assembly (40). One end of the strip plate (82) is connected to the U-shaped fixing frame (81), and a vertical drive rod (83) is installed on the upper surface of the other end. The lower end of the vertical drive rod (83) is connected to the laser heater (72), and the laser lens on the laser heater (72) points downward.

6. The weld apparatus to reduce weld stresses of claim 5, wherein, The vertical drive rod (83) includes an electric push rod (831) and a movable mounting plate (832) connected to its extended end. The laser heater (72) is connected to the lower surface of the movable mounting plate (832). Guide rods (833) are provided on both sides of the electric push rod (831). The guide rods (833) are mounted on the strip plate (82) and their lower ends are connected to the movable mounting plate (832).

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