A hot roll weld repair apparatus and method

Abstract

The application belongs to the technical field of weld repair, and discloses a hot rolling weld repair device and a repair method, wherein the hot rolling weld repair device comprises a resistance seam welding mechanism, the resistance seam welding mechanism comprises a weld width detection mechanism for detecting the width of a weld; the electrode wheel set comprises a first electrode wheel and a second electrode wheel, the first electrode wheel and the second electrode wheel are coaxially arranged, and the first electrode wheel can move axially along the second electrode wheel; a spacing adjustment mechanism is used for adjusting the axial spacing of the first electrode wheel and the second electrode wheel; a processor is connected with the weld width detection mechanism and the spacing adjustment mechanism respectively, and drives the spacing adjustment mechanism to adjust the axial spacing of the first electrode wheel and the second electrode wheel according to the width detected by the weld detection mechanism. The application can effectively repair the porosity defects of the weld, and can ensure high repair efficiency.

Description

Technical Field

[0001] This invention relates to the field of weld seam repair technology, and more specifically, to a hot-rolled weld seam repair device and repair method. Background Technology

[0002] For aerospace equipment made of titanium alloy, the quality requirements for welds are very high due to the special application scenarios. When using ordinary argon arc welding, some air bubbles (or pores) will remain in the weld after welding. The presence of air bubbles will affect the quality of the weld and make it difficult to meet the required connection strength.

[0003] Currently, to address the aforementioned problems, existing technologies employ resistance welding equipment to hot-roll and compress the weld seam after it has been welded, thereby releasing and removing air bubbles from the weld. For example, patent CN102107319A discloses a method for hot-rolling repair of porosity defects in fusion welds of titanium alloy thin plates. This patent utilizes the principle of resistance welding to repair the welded area. While the patent claims a 100% defect repair success rate, in practical applications, it is clear that there are still some problems with defect repair, making it difficult to achieve 100% repair. Summary of the Invention

[0004] The purpose of this invention is to provide a hot rolling weld repair device and repair method, to identify the defects of hot rolling weld repair technology in practical applications, to improve the problems of hot rolling repair, and to improve the qualification rate and efficiency of weld repair.

[0005] This invention is achieved through the following technical solution:

[0006] A hot rolling weld repair device includes a resistance weld mechanism, the resistance weld mechanism comprising:

[0007] Electrode wheel assembly, used for rolling weld seams;

[0008] The electrode wheel assembly is disposed on the support base;

[0009] A weld width inspection mechanism is used to inspect the width of welds.

[0010] The electrode wheel assembly includes a first electrode wheel and a second electrode wheel, which are arranged coaxially, and the first electrode wheel is movable along the axial direction of the second electrode wheel.

[0011] A spacing adjustment mechanism is used to adjust the axial spacing between the first electrode wheel and the second electrode wheel;

[0012] The processor is connected to both the weld width detection mechanism and the spacing adjustment mechanism. Based on the width detected by the weld width detection mechanism, the processor drives the spacing adjustment mechanism to adjust the axial spacing between the first electrode wheel and the second electrode wheel.

[0013] Optionally, the spacing adjustment mechanism includes:

[0014] An isolation bracket is arranged between the first electrode wheel and the second electrode wheel. The isolation bracket is provided with a protruding structure for embedding into a recessed structure of different depths provided on the first electrode wheel or the second electrode wheel, so as to adjust the axial distance between the first electrode wheel and the second electrode wheel.

[0015] A toggle assembly is used to abut against the isolation bracket to restrict its rotation, causing the protruding structure on the isolation bracket to switch into the recessed structure at different heights.

[0016] Optionally, the protruding structure is made of ball bearings, which are embedded in the isolation bracket. The recessed structure is made of spherical recesses that cooperate with the ball bearings. The actuating component can rotate the isolation bracket so that the ball bearings of the isolation bracket can be embedded in spherical recesses of different depths to adjust the axial distance between the first electrode wheel and the second electrode wheel.

[0017] Optionally, the actuating assembly includes an actuating motor and an actuating lever connected to the output end of the actuating motor. The isolation bracket is provided with an annular toothed surface structure, and the actuating lever can abut against the annular toothed surface structure to restrict its rotation.

[0018] Optionally, the weld width detection mechanism includes several elastic pins arranged side by side, and a pressure sensor is provided at the end of each elastic pin, the pressure sensor being connected to the processor.

[0019] Optionally, a hollow second electrode wheel shaft is provided on one side of the second electrode wheel, the second electrode wheel shaft passes through the support base and is rotatably connected to the support base; a first electrode wheel shaft is provided on one side of the first electrode wheel, the first electrode wheel shaft passes through the second electrode wheel shaft and is axially movably connected to the second electrode wheel shaft, and an elastic component is also provided between the second electrode wheel shaft and the first electrode wheel shaft to maintain the second electrode wheel and the first electrode wheel having a tendency to move closer to each other.

[0020] A repair method based on the aforementioned hot-rolled weld repair device includes the following steps:

[0021] Insert the workpiece with the butt weld between the two sets of electrode wheels;

[0022] The workpiece first contacts the weld width detection mechanism, which detects the width range of the weld. The processor then controls the spacing adjustment mechanism to adjust the spacing between the first and second electrode wheels based on the width range value.

[0023] Power is supplied to the electrode wheel assembly, which simultaneously drives the electrode wheel assembly to rotate and applies pressure to the electrode wheel assembly located above the workpiece, so that the weld seam of the workpiece can be repaired by the crushing action of the electrode wheel assembly.

[0024] Optionally, during weld width detection, the weld centerline of the workpiece passes through the center part of the weld width detection mechanism, allowing the weld to lift part of the elastic pin. The pressure sensor receives the pressure signal, and the processor calculates the weld width range based on the mathematical properties of the pressure signal. The processor then controls the toggle motor, causing the toggle motor to drive the toggle rod to abut against the annular toothed surface structure of the isolation bracket, restricting the rotation of the isolation bracket. Once the protrusion of the isolation bracket rotates into the recessed structure that matches the weld width range, the spacing adjustment of the electrode wheel assembly is completed.

[0025] The technical solution of the present invention has at least the following beneficial effects:

[0026] The hot rolling weld repair device and method of the present invention, by setting up an electrode wheel group consisting of two electrode wheels, performs intermittent rolling on the weld, which can roll on both sides of the weld where the porosity is concentrated, and significantly improves the porosity removal rate; at the same time, the method of rolling repair by two electrode wheels also greatly improves the efficiency of rolling repair, avoiding the need for two rolling to complete a weld. Attached Figure Description

[0027] Figure 1 This is a partial front view of the hot rolling weld repair device of the present invention (weld width detection mechanism omitted);

[0028] Figure 2 This is a partial side view of the hot rolling weld repair device of the present invention;

[0029] Figure 3 This is a side view of the second electrode wheel of the present invention;

[0030] Figure 4 This is a front view of the weld width detection mechanism of the present invention;

[0031] Figure 5 This is a schematic diagram of the control section of the hot rolling weld repair device of the present invention;

[0032] Icons: 11-Workpiece, 12-Weld, 20-Electrode wheel assembly, 21-First electrode wheel, 22-Second electrode wheel, 23-First electrode wheel shaft, 24-Second electrode wheel shaft, 25-Elastic component, 26-Recessed structure, 31-Isolation bracket, 310-Annular toothed surface structure, 32-Protruding structure, 33-Actuating motor, 34-Actuating rod, 40-Support seat, 50-Weld width detection mechanism, 51-Pressure sensor, 52-Elastic ejector pin, 60-Processor. Detailed Implementation

[0033] The existing method for repairing porosity defects in fusion welds of titanium alloy thin plates using hot rolling still has some problems in practical applications, resulting in a low pass rate for weld 12 repair. Research revealed that the main reason is that the cross-sectional profile of weld 12 after argon arc welding is arc-shaped. Metallographic images show that the porosity is concentrated on both sides of the length of weld 12, not in the middle. The arc-shaped profile means that the electrode wheel (or disc electrode) cannot contact the sides of weld 12 during rolling; the electrode wheel can only roll up to the apex of the arc. Therefore, the porosity removal rate is difficult to achieve the ideal level.

[0034] Reference Figure 1-5 The hot rolling weld repair device of the present invention includes a resistance welding mechanism, which includes an electrode wheel assembly 20 and a support base 40. Two sets of electrode wheel assemblies 20 are arranged in the height direction. The upper electrode wheel assembly 20 is usually connected to a hydraulic cylinder to provide the clamping force during rolling. In addition to the electrode wheel assembly 20, the support base 40 is generally equipped with conductive busbars or similar components for conducting electricity to the electrode wheel assembly 20. In order not to affect the expression of the core inventive point, they are not shown in this embodiment. Those skilled in the art can design according to existing resistance welding equipment to provide a conductor busbar to supply power to the electrode. For example, the conductor busbar can be directly connected to the surface of the support base 40, and then the conductor busbar can be designed with a certain elasticity at the end to abut against the electrode wheel to achieve power supply. Even if the position of the electrode wheel moves, the elastic structure can maintain the power supply requirement.

[0035] The electrode wheel assembly 20 includes a first electrode wheel 21 and a second electrode wheel 22, which are coaxially arranged, and the first electrode wheel 21 can move axially along the second electrode wheel 22. Specifically, a hollow second electrode wheel shaft 24 is provided on one side of the second electrode wheel 22. The second electrode wheel shaft 24 passes through the support base 40 and is rotatably connected to the support base 40. Specifically, it can be mounted with bearings. A step is provided on the second electrode wheel shaft 24, and it is mounted to the support base 40 through bearings. The bearings are spaced apart by bushings, and the ends are fixed with bearing end caps. The second electrode wheel shaft 24 extends out of the support base 40 to connect to a mechanism that provides rotational power. This embodiment does not show a specific example; it is sufficient to use the technical means in this field to provide rotational power while ensuring that it can move along the height direction during rolling.

[0036] A first electrode wheel shaft 23 is provided on one side of the first electrode wheel 21. The first electrode wheel shaft 23 passes through the second electrode wheel shaft 24 and is axially connected to the second electrode wheel shaft 24. Specifically, a guide groove is provided in the inner hole of the second electrode wheel shaft 24, and a guide protrusion is provided on the first electrode wheel shaft 23. This enables the transmission of rotational motion while ensuring that the first electrode wheel shaft 23 can move axially along the second electrode wheel shaft 24. An elastic component 25 is also provided between the second electrode wheel shaft 24 and the first electrode wheel shaft 23 to maintain the tendency of the second electrode wheel 22 and the first electrode wheel 21 to move closer to each other. The elastic component 25 is preferably a helical spring, and several of them are arranged in a circular array along the outer circumference of the first electrode wheel shaft 23. They can be distributed at intervals with the guide protrusions. The helical springs are pressed to the right as shown in the figure, so that the first electrode wheel 21 and the second electrode wheel 22 can maintain the tendency of moving closer to each other.

[0037] Due to the special nature of this field, argon arc welding is generally still done manually, resulting in variations in the width of weld 12. Even with automated welding equipment, it is difficult to ensure that the width of weld 12 is uniform. Therefore, the hot rolling weld repair device in this embodiment also includes a spacing adjustment mechanism to adjust the axial spacing between the first electrode wheel 21 and the second electrode wheel 22 to adapt to different weld widths. This ensures that the two electrode wheels are rolling on both sides of the weld 12 along its length. On the one hand, this concentrates the rolling on areas with a large number of pores, thereby improving the pore removal rate and ensuring the product qualification rate. On the other hand, using two electrode wheels to roll and repair simultaneously also improves the efficiency of rolling repair, completing the repair of one weld 12 in one rolling pass.

[0038] The spacing adjustment mechanism includes an isolation bracket 31 and a toggle assembly. The isolation bracket 31 is arranged between the first electrode wheel 21 and the second electrode wheel 22. The isolation bracket 31 has a protruding structure 32 for embedding into recessed structures 26 of different depths on the first electrode wheel 21 or the second electrode wheel 22 to adjust the axial spacing between the first electrode wheel 21 and the second electrode wheel 22. In this embodiment, the protruding structure 32 is a ball bearing embedded in the isolation bracket 31. The recessed structure 26 is a spherical recess that mates with the ball bearing. The toggle assembly can rotate the isolation bracket 31, allowing the ball bearing of the isolation bracket 31 to embed into the spherical recesses of different depths to adjust the axial spacing between the first electrode wheel 21 and the second electrode wheel 22. Figure 1 As shown, the isolation bracket 31 has spherical structures with protruding balls on both sides. The isolation bracket 31 is sleeved on the shaft of the first electrode wheel 23. Spherical pits are arranged on the opposite sides of the first electrode wheel 21 and the second electrode wheel 22, and they are distributed in a decreasing or increasing manner as shown in the figure. When the spherical structure is embedded in the spherical pits of different depths, it can push open the first electrode wheel 21 and the second electrode wheel 22. The distance pushed open is different depending on the depth, thereby realizing the adjustment of the spacing.

[0039] A toggle assembly is used to abut against the isolation bracket 31 to restrict its rotation, causing the protruding structure 32 on the isolation bracket 31 to switch into the recessed structure 26 at different heights. In this embodiment, the toggle assembly includes a toggle motor 33 and a toggle lever 34 connected to the output end of the toggle motor 33. The isolation bracket 31 is provided with an annular toothed surface structure 310. The toggle lever 34 can abut against the annular toothed surface structure 310 to restrict its rotation. After it reaches the set position, the toggle motor 33 rotates and contacts the limit.

[0040] The hot-rolled weld repair device of the present invention further includes a weld width detection mechanism 50 and a processor 60. The weld width detection mechanism 50 includes a plurality of elastic pins 52 arranged side by side. A pressure sensor 51 is provided at the end of each elastic pin 52, and the pressure sensor 51 is connected to the processor 60. When the weld width detection mechanism 50 passes through the weld 12, since the cross-sectional outline of the weld 12 is approximately arc-shaped, some of the elastic pins 52 will be lifted. Thus, the width range can be roughly obtained based on the number of lifted elastic pins 52. The processor 60 is connected to both the weld width detection mechanism 50 and the spacing adjustment mechanism. Based on the width detected by the weld width detection mechanism 50, the processor drives the spacing adjustment mechanism to adjust the axial spacing between the first electrode wheel 21 and the second electrode wheel 22.

[0041] For example, if the width of adjacent ejector pins is 2mm, then when six ejector pins are lifted, the spacing between the six ejector pins will be 10mm. The margin of error is approximately 10-12mm. Of course, this spacing calculation doesn't need to be too precise; a general range is sufficient to adjust the approximate width of the electrode wheels. The processor 60 then drives the actuating component to restrict the isolation bracket 31. When the isolation bracket 31 is stationary, the electrode wheel assembly 20 rotates, causing the ball bearings to switch between various spherical recesses. When the ball bearings rotate to the corresponding 10-12mm wide spherical recess, the actuating component releases the restriction on the isolation bracket 31, completing the spacing adjustment of the electrode wheel assembly 20. This process requires a pre-set initial position, and the processor 60 needs to pre-calculate the limiting time of the actuating component based on parameters such as the rotation speed of the electrode wheel assembly 20 to ensure that the ball bearings reach the specified width range of the spherical recess. This calculation process can be achieved by those skilled in the art through simple arithmetic operations, and will not be elaborated upon in this embodiment. Secondly, the spacing between the electrode wheel sets 20 should be slightly smaller than the 10-12mm spacing. This ensures that the motor wheel set can press onto approximately the left and right thirds of the weld seam 12, leaving a one-third width gap in the middle. Therefore, if the width of the weld seam 12 is 10-12mm, the wheel spacing should be approximately 3-4mm. Of course, this can be adjusted appropriately based on the actual width of the electrode wheels to obtain an approximate spacing width. The main purpose of this invention is to maintain an adjustable spacing between the two sets of electrode wheels. Therefore, the specific spacing, the depth of the spherical pit, and the width of the electrode wheels can all be adjusted and set according to actual needs.

[0042] The repair method of the hot-rolled weld repair device of the present invention includes the following steps:

[0043] When inserting the workpiece 11 with the butt weld 12 between the two sets of electrode wheel sets 20, it is necessary to ensure that the center of the weld 12 and the center of the motor wheel set are roughly aligned for better accuracy.

[0044] Workpiece 11 first contacts weld width detection mechanism 50, which detects the width range of weld 12. Processor 60 controls spacing adjustment mechanism to adjust the spacing between first electrode wheel 21 and second electrode wheel 22 based on the width range. During weld width detection, the center line of weld 12 on workpiece 11 passes through the center part of weld width detection mechanism 50, allowing weld 12 to push up part of elastic pin 52. Correspondingly, pressure sensor 51 receives pressure signal. Processor 60 obtains the width range of weld 12 based on the mathematical properties of the pressure signal and controls toggle motor 33, causing toggle motor 33 to drive toggle rod 34 to abut against the annular toothed surface structure 310 of isolation bracket 31, restricting the rotation of isolation bracket 31. When the protrusion of isolation bracket 31 rotates into the recessed structure 26 that matches the width range of weld 12, the spacing adjustment of electrode wheel group 20 is completed.

[0045] Power is supplied to the electrode wheel assembly 20, which is driven to rotate and pressure is applied to the electrode wheel assembly 20 above the workpiece 11, so that the weld 12 of the workpiece 11 can be repaired by the crushing of the electrode wheel assembly 20.

Claims

1. A hot rolling weld repair device, comprising a resistance weld mechanism, wherein the resistance weld mechanism includes: Electrode wheel assembly, used for rolling weld seams; The electrode wheel assembly is disposed on the support base; Its characteristic is that it further includes: A weld width inspection mechanism is used to inspect the width of welds. The electrode wheel assembly includes a first electrode wheel and a second electrode wheel, which are arranged coaxially, and the first electrode wheel is movable along the axial direction of the second electrode wheel. A spacing adjustment mechanism is used to adjust the axial spacing between the first electrode wheel and the second electrode wheel; The processor is connected to the weld width detection mechanism and the spacing adjustment mechanism respectively, and drives the spacing adjustment mechanism to adjust the axial spacing between the first electrode wheel and the second electrode wheel according to the width detected by the weld width detection mechanism. The spacing adjustment mechanism includes: An isolation bracket is arranged between the first electrode wheel and the second electrode wheel. The isolation bracket is provided with a protruding structure for embedding into a recessed structure of different depths provided on the first electrode wheel or the second electrode wheel, so as to adjust the axial distance between the first electrode wheel and the second electrode wheel. A toggle assembly is used to abut against the isolation bracket to restrict its rotation, so that the protruding structure on the isolation bracket switches into the recessed structure at different heights; The protruding structure uses ball bearings, which are embedded in the isolation bracket. The recessed structure uses spherical recesses that cooperate with the ball bearings. The actuating component can rotate the isolation bracket so that the ball bearings of the isolation bracket can be embedded in spherical recesses of different depths to adjust the axial distance between the first electrode wheel and the second electrode wheel. The actuation assembly includes an actuation motor and an actuation rod connected to the output end of the actuation motor. The isolation bracket is provided with an annular toothed surface structure, and the actuation rod can abut against the annular toothed surface structure to restrict its rotation. A hollow second electrode wheel shaft is provided on one side of the second electrode wheel, and the second electrode wheel shaft passes through the support base and is rotatably connected to the support base; a first electrode wheel shaft is provided on one side of the first electrode wheel, and the first electrode wheel shaft passes through the second electrode wheel shaft and is axially movably connected to the second electrode wheel shaft; an elastic component is also provided between the second electrode wheel shaft and the first electrode wheel shaft to maintain the second electrode wheel and the first electrode wheel having a tendency to move closer to each other.

2. The hot-rolled weld repair device according to claim 1, characterized in that, The weld width detection mechanism includes several elastic pins arranged side by side, and a pressure sensor is provided at the end of each elastic pin, which is connected to the processor.

3. A repair method based on the hot-rolled weld repair device according to any one of claims 1-2, characterized in that, Includes the following steps: Insert the workpiece with the butt weld between the two sets of electrode wheels; The workpiece first contacts the weld width detection mechanism, which detects the width range of the weld. The processor then controls the spacing adjustment mechanism to adjust the spacing between the first and second electrode wheels based on the width range value. Power is supplied to the electrode wheel assembly, which simultaneously drives the electrode wheel assembly to rotate and applies pressure to the electrode wheel assembly located above the workpiece, so that the weld seam of the workpiece can be repaired by the crushing action of the electrode wheel assembly.

4. The repair method of the hot-rolled weld repair device according to claim 3, characterized in that, During weld width detection, the weld centerline of the workpiece passes through the center part of the weld width detection mechanism, allowing the weld to lift part of the elastic pin. The corresponding pressure sensor detects the pressure signal, and the processor calculates the weld width range based on the pressure signal. It then controls the toggle motor, which drives the toggle lever to abut against the annular toothed surface structure of the isolation bracket, restricting the rotation of the isolation bracket. Once the protrusion of the isolation bracket rotates into the recessed structure that matches the weld width range, the spacing of the electrode wheel assembly is adjusted.

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