A device and method for repairing excessive misalignment of aluminum-magnesium alloy cylinder butt joints

Abstract

The present invention discloses a device and method for repairing excessive misalignment of a butt joint of an aluminum-magnesium alloy cylinder, comprising a fixing frame and a tightening mechanism, wherein the aluminum-magnesium alloy cylinder comprises a lower cylinder and an upper cylinder, a weld is arranged between the lower cylinder and the upper cylinder, the fixing frame is fixed to one of the lower cylinder and the upper cylinder, one end of the tightening mechanism presses the other of the lower cylinder and the upper cylinder, and the other end of the tightening mechanism is fixed to the fixing frame. The present invention provides a device and method for repairing excessive misalignment of a butt joint of an aluminum-magnesium alloy cylinder, which can realize on-site rapid repair of the misalignment of the butt joint, and the quality of the repaired weld is high.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum-magnesium alloy cylinder welding, and in particular to a device and method for repairing excessive misalignment of an aluminum-magnesium alloy cylinder butt joint. Background Art

[0002] At present, most air separation units at home and abroad use 5083 aluminum-magnesium alloy as the production and manufacturing material for aluminum towers and pipelines. Since the strength of aluminum-magnesium alloy materials is lower than that of steel, but the plasticity and toughness are higher than those of steel, deformation is easily generated during the assembly and welding process, resulting in excessive misalignment of the welded joints. Especially during the on-site vertical assembly and welding of aluminum towers, the problem of excessive misalignment and unqualified failure is often encountered. In response to the above problems, the present application provides a device and method for repairing excessive misalignment of aluminum-magnesium alloy cylinder butt joints, which can realize on-site rapid repair of the misalignment of butt joints, and the quality of the repaired welds is high. Summary of the invention

[0003] In order to overcome the problem of excessive misalignment and unqualified failure often encountered in the on-site vertical assembly welding process of aluminum towers in the prior art, the present invention provides a device and method for repairing excessive misalignment of aluminum-magnesium alloy cylinder butt joints, which can realize on-site rapid repair of the misalignment of butt joints, and the quality of the repaired welds is high.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A device for repairing excessive misalignment of an aluminum-magnesium alloy cylinder butt joint comprises a fixing frame and a tightening mechanism, wherein the aluminum-magnesium alloy cylinder comprises a lower cylinder and an upper cylinder, a weld is arranged between the lower cylinder and the upper cylinder, the fixing frame is fixed to one of the lower cylinder and the upper cylinder, one end of the tightening mechanism presses the other of the lower cylinder and the upper cylinder, and the other end of the tightening mechanism is fixed to the fixing frame.

[0006] In the above technical scheme, the tightening mechanism is a jack, and the repair device can repair the local misalignment of the butt joint on the large-size aluminum-magnesium alloy cylinder. When the butt joint of the cylinder is misaligned, one of the lower cylinder and the upper cylinder is convex and the other is concave. When repair is required, first use a handheld electric cutting saw to remove the inner and outer cover layers on the weld between the lower cylinder and the upper cylinder; then fix the fixing frame on the concave cylinder, align the tightening mechanism with the other cylinder, and use the tightening mechanism to flatten the two cylinders as much as possible, tighten and weld at the same time, and use the welding heat to soften the material, which is convenient for the misalignment of the butt joint to return to its original position, and can also reduce the damage to the cylinder material when tightening and returning. When the misalignment amount returns to meet the standard requirements, the tightening mechanism stops applying force, maintains a balanced state, and continues to weld. Then weld the inner weld, and use the welding heat during the welding of the inner weld to perform stress relief heat treatment on the adjusted weld; after the weld naturally cools to room temperature, the fixing frame is sawed off the cylinder, and the welding position of the fixing frame is ground.

[0007] Preferably, the fixing frame is fixed to one of the lower cylinder and the upper cylinder by welding. The structure can ensure that the fixing frame is reliably connected to the cylinder and will not fall off when tightened.

[0008] Preferably, there are multiple tightening mechanisms, which are arranged transversely. When the length of the weld with excessive misalignment is long, one tightening mechanism cannot accurately return the misalignment to its original position. Multiple tightening mechanisms can be used to return the misalignment at each position to a suitable position as much as possible.

[0009] Preferably, a heating device is provided on the fixing frame, and the heating device is aligned with the weld position. The heating device can preheat the weld, which can improve the welding quality and meet the welding process requirements on the one hand, and reduce the strength of the repaired weld itself on the other hand, so as to facilitate the return of the misaligned edge.

[0010] Preferably, the heating device is connected to the fixing frame in a lateral sliding manner. The structure facilitates the movement of the heating device to heat different positions.

[0011] Preferably, the heating device is a flamethrower.

[0012] Preferably, the heating device is a plurality of high-frequency induction heating coils, and the high-frequency induction heating coils are aligned with the welding seam position.

[0013] Preferably, the fixing frame is provided with a plurality of infrared thermometers, which can measure the temperature of the cylinder body and facilitate temperature control.

[0014] Preferably, it also includes an inner connecting frame, a fixing frame and a tightening mechanism are arranged on the outside of the aluminum-magnesium alloy cylinder, an inner connecting frame is arranged on the inside of the aluminum-magnesium alloy cylinder, the fixing frame and the inner connecting frame are arranged opposite to each other, and a plurality of high-frequency induction heating coils are arranged on the inner connecting frame, and the high-frequency induction heating coils are aligned with the weld position. The structure can realize preheating of the weld from the inside, avoid interference with the welding tool during welding, and the unwelded position can still maintain the preheating temperature.

[0015] Preferably, a plurality of infrared thermometers are provided on the inner connecting frame.

[0016] Preferably, the fixing frame includes a support portion and a welding portion, the support portion and the welding portion are fixed by bolts, the tightening mechanism is arranged on the support portion, and the welding portion is fixed to the lower cylinder or the upper cylinder. The structure is convenient for welding of the fixing frame, and the welding portion is easy to be worn out during cutting, and can be replaced in time, while the remaining other structures can be reused.

[0017] A method for repairing excessive misalignment of an aluminum-magnesium alloy cylinder butt joint adopts the above-mentioned device for repairing excessive misalignment of an aluminum-magnesium alloy cylinder butt joint, and is characterized by comprising the following steps:

[0018] a. Weld capping removal: Use a handheld electric cutting saw to remove the inner and outer weld capping layers on the weld between the lower cylinder and the upper cylinder;

[0019] b. Fixing the device: weld the fixing frame to the relatively concave cylinder between the lower cylinder and the upper cylinder, align the tightening mechanism with the relatively convex cylinder between the lower cylinder and the upper cylinder, and then extend the tightening mechanism to apply pre-tightening force;

[0020] c. Weld preheating: Use a heating device to preheat the cylinder and weld within 150mm around the weld to be repaired, so that the material temperature within the range is maintained between 150-180℃;

[0021] d. External seam welding: Use welding tools to weld the original external weld position, and at the same time, push out the tightening mechanism, observe the change of the misalignment, measure the misalignment amount, and when the misalignment amount meets the standard requirements, the tightening mechanism stops pushing out to maintain a balanced state;

[0022] e. Internal seam welding: Weld the internal weld surface and use the welding heat to relieve stress of the adjusted weld;

[0023] f. Device disassembly: After the weld has naturally cooled to room temperature, saw the fixing frame off the cylinder and grind the welding position of the fixing frame.

[0024] The above technical scheme can realize the repair of the misalignment of the butt joint, and the weld quality can be increased by preheating the weld. The welding heat can be used to soften the material to facilitate the tightening mechanism to push it back into place. The welding heat during the welding of the inner weld can also be used to perform stress relief heat treatment on the adjusted weld.

[0025] Preferably, after the device is disassembled, a penetrant flaw detection test is performed on the welding positions of the fixing frame.

[0026] The beneficial effects of the present invention are: (1) it can realize on-site rapid repair of the misalignment of the butt joint, and the quality of the repaired weld is high; (2) the heating device can preheat the weld, which can improve the welding quality and meet the welding process requirements on the one hand, and reduce the strength of the repaired weld itself on the other hand, making it easier to return the misalignment to its original position; (3) the welding heat during the welding of the inner weld can be used to perform stress relief heat treatment on the adjusted weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] In the figure: lower cylinder 1, upper cylinder 2, weld 3, fixing frame 4, supporting part 4.1, welding part 4.2, tightening mechanism 5, heating device 6, infrared thermometer 7. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Embodiment 1:

[0031] like Figure 1 As shown, a device for repairing an excessive misalignment of an aluminum-magnesium alloy cylinder butt joint comprises a fixing frame 4 and a plurality of tightening mechanisms 5. The aluminum-magnesium alloy cylinder comprises a lower cylinder 1 and an upper cylinder 2. A weld 3 is provided between the lower cylinder 1 and the upper cylinder 2. The fixing frame 4 is welded and fixed to the lower cylinder 1. One end of the tightening mechanism 5 is pressed against the upper cylinder 2, and the other end of the tightening mechanism 5 is fixed to the fixing frame 4. The plurality of tightening mechanisms 5 are arranged horizontally.

[0032] In the above technical solution, the tightening mechanism 5 is a jack, and the repair device can repair the local misalignment of the butt joint on the large-sized aluminum-magnesium alloy cylinder. When the butt joint of the cylinder is misaligned, one of the lower cylinder 1 and the upper cylinder 2 is convex and the other is concave. When repair is required, a handheld electric cutting saw is first used to remove the inner and outer cover layers on the weld 3 between the lower cylinder 1 and the upper cylinder 2; then the fixing frame 4 is fixed on the concave cylinder, the tightening mechanism 5 is aligned with the other cylinder, and the tightening mechanism 5 is used to push the two cylinders as flat as possible. , while tightening and welding, the welding heat is used to soften the material, which is convenient for the misalignment return of the butt joint, and can also reduce the damage to the cylinder material during the tightening return. When the misalignment amount returns to meet the standard requirements, the tightening mechanism 5 stops applying force, maintains the balance state, and continues to weld. Then, the inner weld 3 is welded, and the welding heat during the welding of the inner weld is used to perform stress relief heat treatment on the adjusted weld 3; after the weld 3 is naturally cooled to room temperature, the fixing frame 4 is sawed off from the cylinder, and the welding position of the fixing frame 4 is ground.

[0033] Embodiment 2:

[0034] like Figure 1 As shown, on the basis of Example 1, a heating device 6 is provided on the fixing frame 4, and the heating device 6 is a flamethrower, and the heating device 6 is aligned with the position of the weld 3. The heating device 6 is connected to the fixing frame 4 in a lateral sliding manner. A plurality of infrared thermometers 7 are provided on the fixing frame 4. The fixing frame 4 includes a supporting portion 4.1 and a welding portion 4.2, and the supporting portion 4.1 and the welding portion 4.2 are fixed by bolts, and a tightening mechanism 5 is provided on the supporting portion 4.1, and the welding portion 4.2 is fixed to the lower cylinder 1 or the upper cylinder 2.

[0035] The heating device 6 can preheat the weld 3, which can improve the welding quality and meet the welding process requirements on the one hand, and reduce the strength of the repaired weld 3 itself on the other hand, making it easier to return the misaligned edges to their original positions.

[0036] Embodiment 3:

[0037] like Figure 1 As shown, on the basis of Example 1, a heating device 6 is provided on the fixing frame 4, and the heating device 6 is a plurality of high-frequency induction heating coils, and the heating device 6 is aligned with the position of the weld 3. The heating device 6 is connected to the fixing frame 4 in a lateral sliding manner. A plurality of infrared thermometers 7 are provided on the fixing frame 4. The fixing frame 4 includes a supporting portion 4.1 and a welding portion 4.2, and the supporting portion 4.1 and the welding portion 4.2 are fixed by bolts, and a tightening mechanism 5 is provided on the supporting portion 4.1, and the welding portion 4.2 is fixed to the lower cylinder 1 or the upper cylinder 2.

[0038] The heating device 6 can preheat the weld 3, which can improve the welding quality and meet the welding process requirements on the one hand, and reduce the strength of the repaired weld 3 itself on the other hand, making it easier to return the misaligned edges to their original positions.

[0039] Embodiment 4:

[0040] A method for repairing excessive misalignment of an aluminum-magnesium alloy cylinder butt joint adopts the above-mentioned device for repairing excessive misalignment of an aluminum-magnesium alloy cylinder butt joint, and is characterized by comprising the following steps:

[0041] a. Weld capping removal: Use a handheld electric cutting saw to remove the inner and outer weld capping layers on the weld 3 between the lower cylinder 1 and the upper cylinder 2;

[0042] b. Fixing the device: Weld the fixing frame 4 to the relatively concave cylinder between the lower cylinder 1 and the upper cylinder 2, align the tightening mechanism 5 with the relatively convex cylinder between the lower cylinder 1 and the upper cylinder 2, and then extend the tightening mechanism 5 to apply a pre-tightening force;

[0043] c. Weld preheating: Use the heating device 6 to preheat the cylinder and weld 3 within 150mm around the weld 3 to be repaired, so that the material temperature within the range is maintained between 150-180℃;

[0044] d. External seam welding: Use welding tools to weld the original external weld 3, and at the same time push out the clamping mechanism 5, observe the change of the misalignment, and use a shape ruler to measure the misalignment. When the misalignment meets the standard requirements, the clamping mechanism 5 stops pushing out to maintain a balanced state;

[0045] e. Inner seam welding: welding the inner weld 3 surface, using the welding heat to perform stress relief heat treatment on the adjusted weld 3;

[0046] f. Device disassembly: After the weld 3 is naturally cooled to room temperature, the fixing frame 4 is sawed off from the cylinder, the welding position of the fixing frame 4 is ground, and then the welding position of the fixing frame 4 is subjected to penetrant flaw detection.

[0047] The above technical scheme can realize the repair of the misalignment of the butt joint, and the preheating of the weld 3 can increase the quality of the weld 3, and the welding heat can be used to soften the material to facilitate the tightening mechanism 5 to push it back into place. The welding heat during the welding of the inner weld 3 can also be used to perform stress relief heat treatment on the adjusted weld 3.

[0048] The beneficial effects of the present invention are: (1) it can realize the on-site rapid repair of the misalignment of the butt joint, and the quality of the repaired weld 3 is high; (2) the heating device 6 can preheat the weld 3, which can improve the welding quality and meet the welding process requirements on the one hand, and reduce the strength of the repaired weld 3 itself on the other hand, making it easier to return the misalignment to its original position; (3) the welding heat during the welding of the inner weld 3 can be used to perform stress relief heat treatment on the adjusted weld 3.

Claims

1. A method for repairing an excessive misalignment of an aluminum-magnesium alloy cylinder butt joint, comprising a fixing frame and a tightening mechanism, wherein the aluminum-magnesium alloy cylinder comprises a lower cylinder and an upper cylinder, a weld is arranged between the lower cylinder and the upper cylinder, the fixing frame is fixed to one of the lower cylinder and the upper cylinder, one end of the tightening mechanism presses the other of the lower cylinder and the upper cylinder, and the other end of the tightening mechanism is fixed to the fixing frame, and a heating device is arranged on the fixing frame, wherein the fixing frame is characterized in that: The following steps are involved: a. Removal of weld capping: Use a handheld electric cutting saw to remove the inner and outer weld capping layers of welds on the welds where the misalignment occurs between the lower and upper cylinders; b. Fixing the device: weld the fixing frame to the relatively concave cylinder between the lower cylinder and the upper cylinder, align the tightening mechanism with the relatively convex cylinder between the lower cylinder and the upper cylinder, and then extend the tightening mechanism to apply pre-tightening force; c. Weld preheating: Use a heating device to preheat the cylinder and weld within 150mm around the weld to be repaired, so that the material temperature within the range is heated to between 150-180℃; d. External seam welding: Use welding tools to weld the original external weld position, and push out the tightening mechanism at the same time, tighten and weld at the same time, use the welding heat to soften the material, so as to facilitate the misalignment return of the butt joint, observe the change of misalignment return, measure the misalignment amount, and when the misalignment amount meets the standard requirements, the tightening mechanism stops pushing out to maintain a balanced state; e. Internal seam welding: Weld the internal weld surface and use the welding heat to relieve stress of the adjusted weld; f. Device disassembly: After the weld has naturally cooled to room temperature, saw the fixing frame off the cylinder and grind the welding position of the fixing frame.

2. The method for repairing the excessive misalignment of the aluminum-magnesium alloy cylinder butt joint according to claim 1 is characterized in that: The fixing frame is fixed by welding to one of the lower cylinder and the upper cylinder.

3. The method for repairing the excessive misalignment of the aluminum-magnesium alloy cylinder butt joint according to claim 1 is characterized in that: There are multiple pressing mechanisms, and the multiple pressing mechanisms are arranged horizontally.

4. The method for repairing the misalignment of aluminum-magnesium alloy cylinder butt joints according to claim 1 is characterized in that: The heating device is slidably connected to the fixing frame in a transverse direction.

5. The method for repairing excessive misalignment of aluminum-magnesium alloy cylinder butt joints according to claim 1 is characterized in that: After the device is disassembled, the welding position of the fixing frame needs to be inspected by penetrant testing.

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