A quick and simple centering and positioning method for butt-welded pipes

Abstract

The application discloses a kind of butt welding pipe quick and easy centering positioning method, the steps include: S1, prepare a kind of device for butt welding pipe quick and easy centering positioning;S2, according to the length of pipe to be welded, determine the number of horizontal target;S3, sequentially place horizontal target and adjust to the position of center alignment;S4, according to the length and angle of pipe manufacturing parts drawing, place pipe to be welded, and select appropriate moving target;S5, insert moving target in the gap between the left and right ends of horizontal target, adjust each moving target until abutting on pipe to be welded;S6, confirm and adjust the length and corner between pipe to be welded, complete centering positioning;S7, after two pipe to be welded spot welding is fixed, full welding and polishing shaping, complete butt welding.The method of the application can realize quick centering positioning, reduce welding defects and improve welding quality.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding, and particularly relates to a quick and simple method for centering and positioning pipes for butt welding. Background Technology

[0002] In ship piping systems, pipes are often connected by flanges, while pipes and flanges are typically joined by welding. Due to differences in pipe material, the welding materials and methods used vary. On ships, stainless steel pipes are commonly used in high-pressure, corrosion-resistant, and easily contaminated areas and piping systems, such as liquid cargo tank level telemetry, hydraulic oil lines, and compressed air systems. Stainless steel pipes are primarily welded using gas-shielded welding, especially argon-shielded welding, also known as TIG welding.

[0003] Argon arc welding demands a high level of skill from the welder. During welding, an inert gas must cover the entire welding surface; otherwise, defects such as cracks, bubbles, and weld slag are likely to occur. Furthermore, due to the small diameter of stainless steel pipes, the limited space when welding flanges, coupled with the tendency for argon gas to leak, significantly impacts weld quality. Therefore, in the process of butt welding pipes, accurate alignment and positioning between the pipes to be welded are paramount.

[0004] A Chinese invention application with publication number CN201911135027.0 discloses an auxiliary device and method for centering welding of ship pipelines. The application states that "this invention discloses an auxiliary device for centering welding of ship pipelines, belonging to the technical field of pipeline welding equipment, including a bent pipe section and a straight pipe section. The bent pipe section has a first V-shaped support block and a second V-shaped support block along the pipeline direction; the straight pipe section has a third V-shaped support block and a fourth V-shaped support block along the pipeline direction. The third V-shaped support block and the second V-shaped support block are set at the same height facing each other, and the fourth V-shaped support block slides on the base along the pipeline direction." This invention can center and position a straight pipe of a certain length and a bent pipe with different bending radii and bending angles by adjusting the distance and angle between the four V-shaped support blocks. However, the device has a complex structure and high manufacturing cost; it lacks structures at both ends for abutting and tightly fitting the pipe fittings, which can cause movement during welding; furthermore, it cannot adjust the angle between bent pipes, resulting in poor adaptability and difficulty in meeting the requirements of pipe manufacturing part drawings. Summary of the Invention

[0005] To address the problems existing in the prior art described above, the present invention aims to provide a quick and simple method for centering and positioning butt-welded pipes, thereby reducing welding defects and improving welding quality.

[0006] To achieve the above and other related objectives, the present invention adopts the following technical solution:

[0007] This invention provides a quick and simple method for centering and positioning pipes for butt welding, used for centering and positioning two pipes to be welded, wherein the two pipes are pipe fittings with the same outer diameter at the butt weld joint, the pipe fittings include straight pipes or bends, the bends include a longitudinal pipe section and a transverse pipe section for butt welding, and the method includes the following steps.

[0008] S1. Prepare a device for quick and easy centering and positioning of butt-welded pipes:

[0009] The device includes a movable target and a horizontal target;

[0010] The horizontal target includes a right-angle plate one, a right-angle plate two, and two bases. The right-angle plate one is mounted on two opposite bases. The opening of the right-angle plate one faces upward and the angle bisector of the right-angle plate one is perpendicular to the ground. The inner upper edge of each base is fixedly connected to the lower end face of the right-angle plate one. The right-angle plate two is arranged parallel to each other below the right-angle plate one. The two long sides of the right-angle plate two are fixedly connected to the inner end face of each base.

[0011] The movable target includes a longitudinal part and a transverse part, the longitudinal part and the transverse part are fixedly connected at an angle, and the transverse part has a shape that matches the gap shape of right angle plate one and right angle plate two. The movable target is movably connected to the horizontal target through the transverse part.

[0012] S2. Determine the number of horizontal targets based on the lengths of pipe 1 and pipe 2 to be welded as required by the pipe manufacturing part drawing.

[0013] S3. Place the horizontal targets from S2 on the workbench in sequence, adjust the position of each horizontal target, align the centers of each horizontal target, and make the planes containing the angle bisectors of each right-angle plate coincide.

[0014] S4. According to the length and angle required by the pipe manufacturing part drawing, place the first pipe to be welded and the second pipe to be welded on the horizontal target in sequence, and select the appropriate moving target according to the first pipe to be welded and the second pipe to be welded.

[0015] S5. Insert a movable target into the horizontal target at the leftmost and rightmost ends, and adjust the movable targets until the longitudinal part of each movable target abuts against the first and second pipes to be welded, respectively.

[0016] S6. Based on the pipe manufacturing part drawing, confirm and adjust the length and angle of the pipe to be welded (pipe 1 and pipe 2) to complete the centering and positioning.

[0017] S7. Spot weld the first and second pipes to be welded, and finally perform full welding and grinding to shape to complete the butt welding.

[0018] As a preferred technical solution, in step S1, the movable target further includes a V-shaped plate, with a bolt vertically fixed to the tip of the V-shaped plate. A movable groove is longitudinally opened on the longitudinal part. The V-shaped plate is fastened to the movable groove of the longitudinal part by bolts and nuts. After loosening the nut, the V-shaped plate can move up and down along the movable groove and rotate with the bolt axis as the rotation axis.

[0019] Furthermore, in step S1, a pad is provided between the V-shaped plate and the longitudinal part. The center of the pad has a through hole for the V-shaped plate bolt to pass through, and one end of the pad has a groove with the same shape as the V-shaped plate. The V-shaped plate is fitted into the pad, and the pad can rotate together with the rotation of the V-shaped plate.

[0020] As a further preferred technical solution, in step S1, the movable target is also equipped with a binding element and / or a support pad.

[0021] As a preferred technical solution, in step S2, the number of horizontal targets selected is positively correlated with the total transverse length of the first and second pipes to be welded. The number of horizontal targets can be reduced by adjusting the position interval of the horizontal targets.

[0022] As a preferred technical solution, the specific steps of step S3 include: placing the first and second pipes to be welded from left to right into the opening of the right-angle plate, and ensuring that the butt joint between the first and second pipes to be welded falls on the horizontal target.

[0023] As a preferred technical solution, in step S4:

[0024] When the pipe to be welded is a straight pipe, the longitudinal part and the transverse part of the selected moving target are fixedly connected at 90° vertically. The longitudinal part can be made of V-shaped metal or rectangular metal.

[0025] When the pipe to be welded is a bend, the longitudinal part of the selected moving target should be made of angle steel or other V-shaped metal.

[0026] As a further preferred technical solution, in step S4: when both the first pipe to be welded and the second pipe to be welded are bent pipes, and there is a turning angle between the first pipe to be welded and the second pipe to be welded, at least one of the selected moving targets needs to be equipped with a rotatable V-shaped plate.

[0027] As a further preferred technical solution, the specific steps of step S6 include:

[0028] When the length needs to be adjusted, observe the butt weld between pipe 1 and pipe 2, and adjust the length of pipe 1 and pipe 2 by adjusting the welding interface interval between them.

[0029] When both pipe 1 and pipe 2 to be welded are bent pipes and the angle needs to be adjusted, loosen the nut on the movable target 2, adjust the height of the V-plate so that the axis of the bolt on the V-plate is collinear with the central axis of the horizontal pipe section of pipe 2 to be welded, then adjust the rotation angle of the V-plate so that the rotation angle meets the angle requirements of the pipe manufacturing part drawing, and finally tighten the nut to achieve the angle adjustment of pipe 1 and pipe 2 to be welded.

[0030] As described above, the present invention has the following beneficial effects:

[0031] (1) The present invention provides a quick and easy centering and positioning method for butt welded pipes. By using a right-angle plate with an upward opening on a horizontal target, it can adapt to pipes of different diameters to be welded. Furthermore, by placing two pipes to be welded on the same right-angle plate or placing two pipes to be welded on aligned right-angle plates, the quick and automatic centering and positioning of the pipes can be achieved.

[0032] (2) The present invention provides a quick and easy centering and positioning method for butt welded pipes, which can meet different centering and positioning requirements. By adjusting the number and position of horizontal targets and cooperating with moving targets, centering and positioning between two straight pipes, between two bent pipes, or between straight pipes and bent pipes can be achieved.

[0033] (3) The present invention provides a quick and easy centering and positioning method for butt welded pipes. By matching the shape of the transverse part of the movable target with the gap between the right angle plate one and the right angle plate two, the movable target can be adjusted along the gap and closely attached to the welded pipe, thereby achieving fixed positioning between the pipes to be welded.

[0034] (4) The present invention provides a quick and easy centering and positioning method for butt welded pipes. By setting a rotatable V-shaped plate on the longitudinal part of the moving target, the angle adjustment between the bends can be achieved at any angle.

[0035] (5) The present invention provides a quick and easy centering and positioning method for butt welded pipes. By configuring binding parts and / or support pads for the moving target, the cost of manufacturing the device can be reduced. The fixed positioning of pipes with different angles on site can be achieved by using only a general-purpose moving target. Attached Figure Description

[0036] Figure 1 This is a left view of the horizontal target in this invention.

[0037] Figure 2 yes Figure 1 Sectional view at point BB.

[0038] Figure 3 This is a left view of the movable target in this invention, in which the longitudinal and transverse parts are fixedly connected at a 90° angle.

[0039] Figure 4 This is a front view of the movable target in the present invention, in which the longitudinal and transverse parts are fixedly connected at a 90° angle.

[0040] Figure 5 This is a front view of the movable target in the present invention, in which the longitudinal part and the transverse part are fixedly connected at an acute angle.

[0041] Figure 6 This is a front view of the movable target in the present invention, in which the longitudinal part and the transverse part are fixedly connected at an obtuse angle.

[0042] Figure 7 This is a left view of the movable target with a rotatable V-shaped plate in this invention.

[0043] Figure 8 This is a schematic diagram of the horizontal centering and positioning of the two pipes to be welded (both pipe 1 and pipe 2) in Embodiment 2 of the present invention, where they are both straight pipes and are positioned at intervals relative to the target.

[0044] Figure 9 This is a schematic diagram of centering and positioning in Embodiment 3 of the present invention when the first pipe to be welded is a straight pipe and the second pipe to be welded is a right-angle bend.

[0045] Figure 10 yes Figure 9 Sectional view at point AA.

[0046] Figure 11 This is a schematic diagram of centering and positioning in Embodiment 4 of the present invention when both the first pipe to be welded and the second pipe to be welded are right-angle bends and have a turning angle.

[0047] Figure 12 This is a schematic diagram of the centering and positioning of the binding parts and support pads when both the first and second pipes to be welded are non-right-angle bends and have no corners, in Embodiment 5 of the present invention.

[0048] The specific explanations of the reference numerals in the attached drawings are as follows: 1. Workbench; 21. Straight pipe one; 22. Straight pipe two; 23. Straight pipe three; 311. Right-angle bend one; 312. Right-angle bend two; 313. Right-angle bend three; 32. Acute-angle bend; 33. Obtuse-angle bend; 41. Base; 42. Right-angle plate one; 43. Right-angle plate two; 44. Angle bisector; 45. Gap; 51. Horizontal part; 52. Longitudinal part; 521. Movable groove; 53. V-shaped plate; 531. Bolt; 532. Nut; 54. Pad; 6. Binding piece; 7. Support pad. Detailed Implementation

[0049] To better understand the purpose, structure, and function of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments.

[0050] In the description of this invention, it should be noted that the positional relationships indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" are based on the positional relationships shown in the accompanying drawings and are only for the purpose of facilitating the description of the embodiments of this invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific direction, and therefore should not be construed as a limitation of this invention.

[0051] Example 1

[0052] This embodiment provides a device for quick and easy centering and positioning of butt-welded pipes. The butt-welded pipes are pipe fittings with the same outer diameter at the butt weld joint. The pipe fittings include straight pipes or bent pipes. The device includes a movable target and a horizontal target.

[0053] The horizontal target includes a right-angle plate 42, a right-angle plate 43, and two bases 41. The right-angle plate 42 is mounted on two oppositely placed bases 41. The opening of the right-angle plate 42 faces upward and the angle bisector 44 of the right-angle plate 42 is perpendicular to the ground. The inner upper edge of each base 41 is fixedly connected to the lower end face of the right-angle plate 42. The right-angle plate 43 is arranged parallel to each other below the right-angle plate 42. The long sides of the two ends of the right-angle plate 43 are fixedly connected to the inner end face of each base 41.

[0054] like Figure 1 and Figure 2 As shown, the base 41 is a rectangular iron block of 100mm*70mm*20mm; the right angle plate 42 and the right angle plate 43 are both formed by welding and fixing two flat iron pieces that are at a 90-degree angle to each other. The specifications of each flat iron piece are 100mm*100mm*5mm, and the vertical distance between the right angle plate 42 and the right angle plate 43 is 6mm.

[0055] The movable target includes a longitudinal part 52 and a transverse part 51. The longitudinal part 52 and the transverse part 51 are fixedly connected at an angle, and the transverse part 51 has a shape that matches the shape of the gap 45 between the right-angle plate 42 and the right-angle plate 43. The movable target is movably connected to the horizontal target by inserting the transverse part 51 into the gap 45 between the right-angle plate 42 and the right-angle plate 43 on the horizontal target.

[0056] like Figure 3 and Figure 4As shown, the longitudinal part 52 and the transverse part 51 are fixedly connected at a 90° angle. Both the longitudinal part 52 and the transverse part 51 of the movable target are 45mm*45mm*150mm angle irons, and the thickness of the angle irons is 5mm. The center lines of the two angle irons are perpendicular to each other. The movable target in this embodiment is a universal type; any movable target without the need for angle adjustment can be used. Even if it is an acute-angle bend 32 or an obtuse-angle bend 33, such as Figure 12 As shown, the pipe fitting can be secured by further equipping it with binding elements 6 and / or support pads 7. The binding elements 6 include, but are not limited to, binding straps or binding ropes, and the support pads 7 include, but are not limited to, sponge pads or rubber pads. In other embodiments where the pipe fitting is a straight pipe, in addition to the general-purpose movable support described above, a movable support with a longitudinal portion 52 made of flat steel or other rectangular metal can also be used. The rectangular longitudinal portion 52 can better fit the straight pipe port.

[0057] In other embodiments, such as Figure 5 As shown, the longitudinal portion 52 and the transverse portion 51 are fixedly connected at an acute angle, as... Figure 6 As shown, the longitudinal part 52 and the transverse part 51 are fixedly connected at an obtuse angle. That is, the included angle between the longitudinal part 52 and the transverse part 51 can be customized according to the requirements of the pipe manufacturing part drawing, which can better provide support and fixation for pipes with special angles and ensure the accuracy of centering and positioning.

[0058] When there is a need for corner adjustment, such as Figure 7 As shown, in another embodiment, the movable target further includes a V-shaped plate 53. A bolt 531 is vertically fixed to the tip of the V-shaped plate 53. A movable groove 521 is longitudinally formed on the longitudinal portion 52. The V-shaped plate 53 is fastened to the movable groove 521 of the longitudinal portion 52 by the bolt 531 and the nut 532. After loosening the nut 532, the V-shaped plate 53 can move up and down along the movable groove 521 and rotate around the axis of the bolt 531. Further, a pad 54 is provided between the V-shaped plate 53 and the longitudinal portion 52. The pad 54 has a through hole in its center for the bolt 531 of the V-shaped plate 53 to pass through, and one end of the pad 54 has a groove with the same shape as the V-shaped plate. The V-shaped plate 53 is fitted into the pad 54, thereby increasing the stability between the V-shaped plate 53 and the longitudinal portion 52. The pad 54 can rotate together with the rotation of the V-shaped plate 53.

[0059] Example 2

[0060] like Figure 8As shown, this embodiment provides a quick and simple centering and positioning method for butt-welded pipes. The method is applied to the centering and positioning of two pipes to be welded, where the two pipes are pipes with the same outer diameter at the butt weld joint. The pipes include straight pipes or bends. The bend includes a longitudinal pipe section and a transverse pipe section for butt welding. The longitudinal pipe section and the transverse pipe section are connected at a certain angle. That is, the bend is any one of a right-angle bend, an obtuse-angle bend 33, or an acute-angle bend 32, which is determined and selected according to the pipe manufacturing part drawing.

[0061] In this embodiment, when the first pipe to be welded is a straight pipe 21 and the second pipe to be welded is a straight pipe 22, the method includes the following steps:

[0062] S1. Prepare a device for quick and easy centering and positioning of butt-welded pipes:

[0063] The device includes a movable target and a horizontal target;

[0064] The horizontal target includes a right-angle plate 42, a right-angle plate 43, and two bases 41. The right-angle plate 42 is mounted on two oppositely placed bases 41. The opening of the right-angle plate 42 faces upward and the angle bisector 44 of the right-angle plate 42 is perpendicular to the ground. The inner upper edge of each base 41 is fixedly connected to the lower end face of the right-angle plate 42. The right-angle plate 43 is arranged parallel to each other below the right-angle plate 42. The long sides of the two ends of the right-angle plate 43 are fixedly connected to the inner end face of each base 41.

[0065] The movable target includes a longitudinal part 52 and a transverse part 51. The longitudinal part 52 and the transverse part 51 are fixedly connected at an angle, and the transverse part 51 has a shape that matches the shape of the gap 45 between the right-angle plate 42 and the right-angle plate 43. The movable target is movably connected to the horizontal target by inserting the transverse part 51 into the gap 45 between the right-angle plate 42 and the right-angle plate 43 on the horizontal target.

[0066] S2. Based on the lengths of pipe 1 and pipe 2 to be welded as required by the pipe manufacturing part drawing, determine the number of horizontal targets:

[0067] The number of horizontal supports selected is positively correlated with the total transverse length of the two pipes to be welded; that is, the longer the total transverse length of the two pipes, the more horizontal supports are selected, and vice versa. Although the number of horizontal supports can be reduced by adjusting the position interval of the horizontal supports when adjusting the positions of each horizontal support later, in order to maintain the stability of the butt weld joint, the butt weld joint must be placed on the horizontal supports to avoid being suspended in the air.

[0068] In this embodiment, the total length of straight pipe 21 and straight pipe 22 is greater than the length of 3 horizontal targets and less than the length of 4 horizontal targets. Furthermore, the lengths of both straight pipe 21 and straight pipe 22 are greater than the length of a single horizontal target. Therefore, in order to ensure the stability of the welding joint, it is determined that 3 horizontal targets are used.

[0069] S3. Place the horizontal targets determined in S2 on the workbench 1 in sequence, adjust the position of each horizontal target, and align the centers of each horizontal target so that the planes containing the angle bisectors 44 of each right-angle plate 42 coincide.

[0070] Place straight pipe 21 and straight pipe 22 sequentially from left to right into the opening of right-angle plate 42, ensuring that the butt weld joint between straight pipe 21 and straight pipe 22 rests on the horizontal target; Figure 8 As shown, when both the first and second pipes to be welded are relatively long, the horizontal target spacing can be set simultaneously.

[0071] S4. According to the length and angle required by the pipe manufacturing part drawing, place pipe 1 and pipe 2 to be welded on the horizontal target in sequence, and select the appropriate moving target according to pipe 1 and pipe 2 to be welded:

[0072] When the pipe to be welded is a straight pipe, the longitudinal part 52 and the transverse part 51 of the movable target are fixedly connected at 90°. The longitudinal part 52 can be made of angle steel or other V-shaped metal, or flat steel or other rectangular metal. The rectangular longitudinal part 52 can better fit the straight pipe end. In this embodiment, the longitudinal part 52 is selected as rectangular and the longitudinal part 52 is fixedly connected at 90° to the transverse part 51 as movable target one and movable target two.

[0073] S5. Insert a movable target into the horizontal target at the leftmost and rightmost ends, and adjust the movable targets until the longitudinal part 52 of each movable target abuts against the pipe to be welded, pipe 1 and pipe 2 respectively:

[0074] Insert the horizontal part 51 of the moving target into the left gap 45 between the right angle plate 42 and the right angle plate 43 on the leftmost horizontal target, and move the moving target horizontally to the right until the vertical part 52 of the moving target is in close contact with the left end port of the straight tube 21.

[0075] Insert the horizontal part 51 of the movable target 2 into the right gap 45 between the right angle plate 42 and the right angle plate 43 on the rightmost horizontal target, and move the movable target 2 horizontally to the left until the vertical part 52 of the movable target 2 is in close contact with the right end port of the straight tube 22.

[0076] S6. Based on the pipe manufacturing part drawing, confirm and adjust the length and angle of pipe 1 and pipe 2 to be welded, and complete the centering and positioning:

[0077] When the length needs to be adjusted, observe the butt weld between pipe 1 and pipe 2. By adjusting the welding interface interval between pipe 1 and pipe 2, the length of straight pipe 1 21 and straight pipe 2 22 can be adjusted to complete the centering and positioning.

[0078] S7. Spot weld the first and second pipes to be welded, and finally perform full welding and grinding to shape to complete the butt welding.

[0079] Example 3

[0080] like Figure 9 and Figure 10 As shown, this embodiment provides a quick and simple centering and positioning method for butt-welded pipes. The method is applied to the centering and positioning of two pipes to be welded, where the two pipes are pipes with the same outer diameter at the butt weld joint. The pipes include straight pipes or bends. The bend includes a longitudinal pipe section and a transverse pipe section for butt welding. The longitudinal pipe section and the transverse pipe section are connected at a certain angle. That is, the bend is any one of a right-angle bend, an obtuse-angle bend 33, or an acute-angle bend 32, which is determined and selected according to the pipe manufacturing part drawing.

[0081] In this embodiment, when the first pipe to be welded is a straight pipe 323 and the second pipe to be welded is a right-angle bend pipe 311, the method includes the following steps:

[0082] S1. Prepare a device for quick and easy centering and positioning of butt-welded pipes:

[0083] The device includes a movable target and a horizontal target;

[0084] The horizontal target includes a right-angle plate 42, a right-angle plate 43, and two bases 41. The right-angle plate 42 is mounted on two oppositely placed bases 41. The opening of the right-angle plate 42 faces upward and the angle bisector 44 of the right-angle plate 42 is perpendicular to the ground. The inner upper edge of each base 41 is fixedly connected to the lower end face of the right-angle plate 42. The right-angle plate 43 is arranged parallel to each other below the right-angle plate 42. The long sides of the two ends of the right-angle plate 43 are fixedly connected to the inner end face of each base 41.

[0085] The movable target includes a longitudinal part 52 and a transverse part 51. The longitudinal part 52 and the transverse part 51 are fixedly connected at an angle, and the transverse part 51 has a shape that matches the shape of the gap 45 between the right-angle plate 42 and the right-angle plate 43. The movable target is movably connected to the horizontal target by inserting the transverse part 51 into the gap 45 between the right-angle plate 42 and the right-angle plate 43 on the horizontal target.

[0086] S2. Based on the lengths of pipe 1 and pipe 2 to be welded as required by the pipe manufacturing part drawing, determine the number of horizontal targets:

[0087] The number of horizontal supports selected is positively correlated with the total transverse length of the two pipes to be welded; that is, the longer the total transverse length of the two pipes, the more horizontal supports are selected, and vice versa. Although the number of horizontal supports can be reduced by adjusting the position interval of the horizontal supports when adjusting the positions of each horizontal support later, in order to maintain the stability of the butt weld joint, the butt weld joint must be placed on the horizontal supports to avoid being suspended in the air.

[0088] In this embodiment, the total length of the straight pipe 323 and the horizontal pipe section of the right-angle bend 311 is slightly greater than the length of the three horizontal targets, and the length of both the straight pipe 323 and the horizontal pipe section of the right-angle bend 311 is greater than the length of a single horizontal target. Therefore, it is determined that three horizontal targets are used.

[0089] S3. Place the horizontal targets determined in S2 on the workbench 1 in sequence, adjust the position of each horizontal target, and align the centers of each horizontal target so that the planes containing the angle bisectors 44 of each right-angle plate 42 coincide.

[0090] Place the horizontal pipe sections of straight pipe 323 and right-angle bend 311 sequentially from left to right into the opening of right-angle plate 42, ensuring that the butt weld joint between the horizontal pipe sections of straight pipe 323 and right-angle bend 311 rests on the horizontal target; Figure 9 As shown, arranging the horizontal targets close together allows for faster alignment of their centers.

[0091] S4. According to the length and angle required by the pipe manufacturing part drawing, place pipe 1 and pipe 2 to be welded on the horizontal target in sequence, and select the appropriate moving target according to pipe 1 and pipe 2 to be welded:

[0092] When the pipe to be welded is a straight pipe, the longitudinal part 52 and the transverse part 51 of the selected movable target are fixedly connected at 90° vertically. The longitudinal part 52 is made of angle steel, flat steel or other rectangular metal, which can make the longitudinal part 52 fit the straight pipe end better.

[0093] When the pipe to be welded is a right-angle bend, the longitudinal part 52 and the transverse part 51 of the movable target are fixedly connected at 90°. The longitudinal part 52 is made of angle steel or other V-shaped metal, which can make the longitudinal part 52 fit better against the outer wall of the bend and play a role in fixing and supporting.

[0094] Therefore, in this embodiment, a movable target one with a rectangular longitudinal portion 52 and a 90° vertical fixed connection to the transverse portion 51 is selected, and a movable target two with a V-shaped longitudinal portion 52 and a 90° vertical fixed connection to the transverse portion 51 is selected.

[0095] S5. Insert a movable target into the horizontal target at the leftmost and rightmost ends, and adjust the movable targets until the longitudinal part 52 of each movable target abuts against the pipe to be welded, pipe 1 and pipe 2 respectively:

[0096] Insert the horizontal part 51 of the moving target into the left gap 45 between the right angle plate 42 and the right angle plate 43 on the leftmost horizontal target, and move the moving target horizontally to the right until the vertical part 52 of the moving target is in close contact with the left end port of the straight tube 23.

[0097] Insert the horizontal part 51 of the moving target 2 into the right gap 45 between the right angle plate 42 and the right angle plate 43 on the rightmost horizontal target, and move the moving target 2 horizontally to the left until the vertical part 52 of the moving target 2 is in close contact with the pipe wall of the right angle bend 311.

[0098] S6. Based on the pipe manufacturing part drawing, confirm and adjust the length and angle of pipe 1 and pipe 2 to be welded, and complete the centering and positioning:

[0099] When the length needs to be adjusted, observe the butt weld between pipe 1 and pipe 2 to be welded. By adjusting the interval between the welding interfaces of pipe 1 and pipe 2 to be welded, the length of straight pipe 323 and right-angle bend 311 can be adjusted to complete the centering and positioning.

[0100] S7. Spot weld the first and second pipes to be welded, and finally perform full welding and grinding to shape to complete the butt welding.

[0101] Example 4

[0102] like Figure 11 As shown, this embodiment provides a quick and simple centering and positioning method for butt-welded pipes. The method is applied to the centering and positioning of two pipes to be welded, where the two pipes are pipes with the same outer diameter at the butt weld joint. The pipes include straight pipes or bends. The bend includes a longitudinal pipe section and a transverse pipe section for butt welding. The longitudinal pipe section and the transverse pipe section are connected at a certain angle. That is, the bend is any one of a right-angle bend, an obtuse-angle bend 33, or an acute-angle bend 32, which is determined and selected according to the pipe manufacturing part drawing.

[0103] In this embodiment, when the first pipe to be welded is a right-angle bend 312 and the second pipe to be welded is a right-angle bend 313, and there is an angle between the first pipe to be welded and the second pipe to be welded, the method includes the following steps:

[0104] S1. Prepare a device for quick and easy centering and positioning of butt-welded pipes:

[0105] The device includes a movable target and a horizontal target;

[0106] The horizontal target includes a right-angle plate 42, a right-angle plate 43, and two bases 41. The right-angle plate 42 is mounted on two oppositely placed bases 41. The opening of the right-angle plate 42 faces upward and the angle bisector 44 of the right-angle plate 42 is perpendicular to the ground. The inner upper edge of each base 41 is fixedly connected to the lower end face of the right-angle plate 42. The right-angle plate 43 is arranged parallel to each other below the right-angle plate 42. The long sides of the two ends of the right-angle plate 43 are fixedly connected to the inner end face of each base 41.

[0107] The movable target includes a longitudinal part 52 and a transverse part 51. The longitudinal part 52 and the transverse part 51 are fixedly connected at an angle, and the transverse part 51 has a shape that matches the shape of the gap 45 between the right-angle plate 42 and the right-angle plate 43. The movable target is movably connected to the horizontal target by inserting the transverse part 51 into the gap 45 between the right-angle plate 42 and the right-angle plate 43 on the horizontal target.

[0108] Furthermore, the movable target also includes a V-shaped plate 53, with a bolt 531 vertically fixed to the tip of the V-shaped plate 53. A movable groove 521 is longitudinally formed on the longitudinal part 52. The V-shaped plate 53 is fastened to the movable groove 521 of the longitudinal part 52 by the bolt 531 and the nut 532. After loosening the nut 532, the V-shaped plate 53 can move up and down along the movable groove 521 and rotate around the axis of the bolt 531. In this embodiment, a pad 54 is also provided between the V-shaped plate 53 and the longitudinal part 52. The center of the pad 54 has a through hole for the bolt 531 of the V-shaped plate 53 to pass through, and one end of the pad 54 has a groove with the same shape as the V-shaped plate. The V-shaped plate 53 is fitted into the pad 54, thereby increasing the stability between the V-shaped plate 53 and the longitudinal part 52. The pad 54 can rotate together with the rotation of the V-shaped plate 53.

[0109] S2. Based on the lengths of pipe 1 and pipe 2 to be welded as required by the pipe manufacturing part drawing, determine the number of horizontal targets:

[0110] The number of horizontal supports selected is positively correlated with the total transverse length of the two pipes to be welded; that is, the longer the total transverse length of the two pipes, the more horizontal supports are selected, and vice versa. Although the number of horizontal supports can be reduced by adjusting the position interval of the horizontal supports when adjusting the positions of each horizontal support later, in order to maintain the stability of the butt weld joint, the butt weld joint must be placed on the horizontal supports to avoid being suspended in the air.

[0111] In this embodiment, the total length of the horizontal pipe section 312 of the second right-angle bend and the horizontal pipe section 313 of the third right-angle bend is greater than the length of three horizontal targets, and the length of the horizontal pipe section 312 of the second right-angle bend and the length of the horizontal pipe section 313 of the third right-angle bend are both greater than the length of a single horizontal target. Therefore, it is determined that three horizontal targets are used.

[0112] S3. Place the horizontal targets determined in S2 on the workbench 1 in sequence, adjust the position of each horizontal target, and align the centers of each horizontal target so that the planes containing the angle bisectors 44 of each right-angle plate 42 coincide.

[0113] Place the horizontal pipe sections 312 and 313 of the right-angle bend from left to right into the opening of the right-angle plate 42, and ensure that the butt weld joint between the horizontal pipe sections 312 and 313 falls on the horizontal target.

[0114] When both pipe 1 and pipe 2 to be welded are bends, and there is an angle between pipe 1 and pipe 2 as required by the pipe manufacturing part drawing, then when placing pipe 1 and pipe 2 to be welded, at least one longitudinal section of the bend should be placed horizontally outside the target, so that the longitudinal section can rotate along the central axis of the transverse section; if Figure 11 As shown, the longitudinal section of the right-angle bend 313 is located horizontally on the outside of the target at the far right end;

[0115] S4. According to the length and angle required by the pipe manufacturing part drawing, place pipe 1 and pipe 2 to be welded on the horizontal target in sequence, and select the appropriate moving target according to pipe 1 and pipe 2 to be welded:

[0116] When the pipe to be welded is a right-angle bend, the longitudinal part 52 and the transverse part 51 of the movable target are fixedly connected at 90°. The longitudinal part 52 is made of angle steel or other V-shaped metal, which can make the longitudinal part 52 fit better against the outer wall of the bend and play a role in fixing and supporting.

[0117] When both the first and second pipes to be welded are bent pipes, and there is an angle between the first and second pipes to be welded, at least one movable target equipped with a rotatable V-shaped plate 53 is required.

[0118] Therefore, in this embodiment, a movable target one with a V-shaped longitudinal portion 52 and a 90° vertical fixed connection to the transverse portion 51 and a movable target two with a rotatable V-shaped plate 53 are selected.

[0119] S5. Insert a movable target into the horizontal target at the leftmost and rightmost ends, and adjust the movable targets until the longitudinal part 52 of each movable target abuts against the pipe to be welded, pipe 1 and pipe 2 respectively:

[0120] Insert the horizontal part 51 of the moving target into the left gap 45 between the right angle plate 42 and the right angle plate 43 on the leftmost horizontal target, and move the moving target horizontally to the right until the vertical part 52 of the moving target is in close contact with the left end port of the right angle bend 312.

[0121] Insert the horizontal part 51 of the moving target 2 into the right gap 45 between the right angle plate 1 42 and the right angle plate 2 43 on the rightmost horizontal target, and move the moving target 2 horizontally to the left until the vertical part 52 of the moving target 2 is in close contact with the pipe wall of the right angle bend 313.

[0122] S6. Based on the pipe manufacturing part drawing, confirm and adjust the length and angle of pipe 1 and pipe 2 to be welded, and complete the centering and positioning:

[0123] When the length needs to be adjusted, observe the butt weld between pipe one and pipe two, and adjust the welding interface interval between pipe one and pipe two to achieve the length adjustment of right angle bend two 312 and right angle bend three 313.

[0124] When the angle needs to be adjusted, in this embodiment, such as Figure 4 and Figure 11 As shown, loosen the nut 532 on the movable target 2, adjust the height of the V-shaped plate 53 so that the axis of the bolt 531 on the V-shaped plate 53 is collinear with the central axis of the horizontal pipe section of the right angle bend 313, then adjust the rotation angle of the V-shaped plate 53 so that the rotation angle meets the rotation angle requirements of the pipe manufacturing part drawing, and finally tighten the nut 532 to realize the rotation angle adjustment of the right angle bend 2 312 and the right angle bend 313; thus completing the centering and positioning.

[0125] S7. Spot weld the first and second pipes to be welded, and finally perform full welding and grinding to shape to complete the butt welding.

[0126] Example 5

[0127] like Figure 12 As shown, this embodiment provides a quick and simple centering and positioning method for butt-welded pipes. The method is applied to the centering and positioning of two pipes to be welded, where the two pipes are pipes with the same outer diameter at the butt weld joint. The pipes include straight pipes or bends. The bend includes a longitudinal pipe section and a transverse pipe section for butt welding. The longitudinal pipe section and the transverse pipe section are connected at a certain angle. That is, the bend is any one of a right-angle bend, an obtuse-angle bend 33, or an acute-angle bend 32, which is determined and selected according to the pipe manufacturing part drawing.

[0128] In this embodiment, when the first pipe to be welded is an acute-angle bend 32 and the second pipe to be welded is an obtuse-angle bend 33, and there is no turning point between the first and second pipes to be welded, the method includes the following steps:

[0129] S1. Prepare a device for quick and easy centering and positioning of butt-welded pipes:

[0130] The device includes a movable target and a horizontal target;

[0131] The horizontal target includes a right-angle plate 42, a right-angle plate 43, and two bases 41. The right-angle plate 42 is mounted on two oppositely placed bases 41. The opening of the right-angle plate 42 faces upward and the angle bisector 44 of the right-angle plate 42 is perpendicular to the ground. The inner upper edge of each base 41 is fixedly connected to the lower end face of the right-angle plate 42. The right-angle plate 43 is arranged parallel to each other below the right-angle plate 42. The long sides of the two ends of the right-angle plate 43 are fixedly connected to the inner end face of each base 41.

[0132] The movable target includes a longitudinal part 52 and a transverse part 51. The longitudinal part 52 and the transverse part 51 are fixedly connected at an angle, and the transverse part 51 has a shape that matches the shape of the gap 45 between the right-angle plate 42 and the right-angle plate 43. The movable target is movably connected to the horizontal target by inserting the transverse part 51 into the gap 45 between the right-angle plate 42 and the right-angle plate 43 on the horizontal target.

[0133] Furthermore, the movable target is also equipped with a binding member 6 and / or a support pad 7. The binding member 6 includes, but is not limited to, binding straps or binding ropes, and the support pad 7 includes, but is not limited to, a sponge pad or a rubber pad.

[0134] S2. Based on the lengths of pipe 1 and pipe 2 to be welded as required by the pipe manufacturing part drawing, determine the number of horizontal targets:

[0135] The number of horizontal supports selected is positively correlated with the total transverse length of the two pipes to be welded; that is, the longer the total transverse length of the two pipes, the more horizontal supports are selected, and vice versa. Although the number of horizontal supports can be reduced by adjusting the position interval of the horizontal supports when adjusting the positions of each horizontal support later, in order to maintain the stability of the butt weld joint, the butt weld joint must be placed on the horizontal supports to avoid being suspended in the air.

[0136] In this embodiment, the total length of the acute-angle bend 32 horizontal pipe segment and the obtuse-angle bend 33 horizontal pipe segment is less than the length of 3 horizontal targets, and the length of both the acute-angle bend 32 horizontal pipe segment and the obtuse-angle bend 33 horizontal pipe segment is greater than the length of a single horizontal target. Therefore, it is determined that 3 horizontal targets are used.

[0137] S3. Place the horizontal targets determined in S2 on the workbench 1 in sequence, adjust the position of each horizontal target, and align the centers of each horizontal target so that the planes containing the angle bisectors 44 of each right-angle plate 42 coincide.

[0138] Place the horizontal pipe sections of the acute-angle bend 32 and the obtuse-angle bend 33 from left to right into the opening of the right-angle plate 42, and make the butt weld joint between the horizontal pipe sections of the acute-angle bend 32 and the obtuse-angle bend 33 fall on the horizontal target.

[0139] S4. According to the length and angle required by the pipe manufacturing part drawing, place pipe 1 and pipe 2 to be welded on the horizontal target in sequence, and select the appropriate moving target according to pipe 1 and pipe 2 to be welded:

[0140] When the pipe to be welded is a bent pipe, the longitudinal part 52 and the transverse part 51 of the movable target are fixedly connected at 90°. The longitudinal part 52 is made of angle steel or other V-shaped metal, which can make the longitudinal part 52 fit better against the outer wall of the bent pipe and play a role in fixing and supporting.

[0141] Therefore, in this embodiment, the vertical portion 52 is V-shaped and is vertically fixed to the horizontal portion 51 at 90°, and the two movable targets are selected.

[0142] Furthermore, since both the first and second pipes to be welded in this embodiment are non-right-angle bends, when placing the first and second pipes to be welded, in order to allow the first and second moving targets to better fit against the first and second pipes to be welded respectively, a binding strap is provided for the first moving target for the acute-angle bend 32, and a sponge pad is provided for the second moving target for the obtuse-angle bend 33.

[0143] S5. Insert a movable target into the horizontal target at the leftmost and rightmost ends, and adjust the movable targets until the longitudinal part 52 of each movable target abuts against the pipe to be welded, pipe 1 and pipe 2 respectively:

[0144] Insert the horizontal part 51 of the moving target into the left gap 45 between the right angle plate 42 and the right angle plate 43 on the leftmost horizontal target, and move the moving target horizontally to the right until the vertical part 52 of the moving target is in close contact with the pipe wall at the turning point of the acute angle bend 32, and fix the acute angle bend 32 with the binding strap.

[0145] Insert the horizontal part 51 of the movable target 2 into the right gap 45 between the right angle plate 42 and the right angle plate 43 on the rightmost horizontal target, and place a sponge pad between the obtuse angle bend 33 and the movable target 2. Move the movable target 2 horizontally to the left until the longitudinal part 52 of the movable target 2 is in close contact with the wall of the obtuse angle bend 33 through the sponge pad.

[0146] S6. Based on the pipe manufacturing part drawing, confirm and adjust the length and angle of pipe 1 and pipe 2 to be welded, and complete the centering and positioning:

[0147] When the length needs to be adjusted, observe the butt weld between the first and second pipes to be welded. By adjusting the interval between the welding interfaces of the first and second pipes to be welded, the length of the acute angle bend 32 and the obtuse angle bend 33 can be adjusted to complete the centering and positioning.

[0148] S7. Spot weld the first and second pipes to be welded, and finally perform full welding and grinding to shape to complete the butt welding.

[0149] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Those skilled in the art can make various changes or equivalent substitutions to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

Claims

1. A quick and simple centering and positioning method for butt-welded pipes, used for centering and positioning between two pipes to be welded, wherein the two pipes to be welded are pipe fittings with the same outer diameter at the butt weld joint, the pipe fittings include straight pipes or bends, the bends include a longitudinal pipe section and a transverse pipe section for butt welding, characterized in that, Includes the following steps, S1. Prepare a device for quick and easy centering and positioning of butt-welded pipes: The device includes a movable target and a horizontal target; The horizontal target includes a right-angle plate one (42), a right-angle plate two (43), and two bases (41). The right-angle plate one (42) is mounted on two opposite bases (41). The opening of the right-angle plate one (42) faces upward and the angle bisector (44) of the right-angle plate one (42) is perpendicular to the ground. The inner upper edge of each base (41) is fixedly connected to the lower end face of the right-angle plate one (42). The right-angle plate two (43) is arranged parallel to each other below the right-angle plate one (42). The long sides of the two ends of the right-angle plate two (43) are fixedly connected to the inner end face of each base (41). The movable target includes a longitudinal part (52) and a transverse part (51). The longitudinal part (52) and the transverse part (51) are fixedly connected at an angle, and the transverse part (51) has a shape that matches the shape of the gap (45) between the right angle plate one (42) and the right angle plate two (43). The movable target is movably connected to the horizontal target through the transverse part (51). S2. Determine the number of horizontal targets based on the lengths of pipe 1 and pipe 2 to be welded as required by the pipe manufacturing part drawing. S3. Place the horizontal targets in S2 on the workbench (1) in sequence, adjust the position of each horizontal target, align the centers of each horizontal target, and make the planes where the angle bisectors (44) of each right angle plate (42) are located coincide. S4. According to the length and angle required by the pipe manufacturing part drawing, place the first pipe to be welded and the second pipe to be welded on the horizontal target in sequence, and select the appropriate moving target according to the first pipe to be welded and the second pipe to be welded. S5. Insert a movable target into the horizontal target at the leftmost and rightmost ends, and adjust the movable targets until the longitudinal part (52) of each movable target abuts against the first and second pipes to be welded respectively. S6. Based on the pipe manufacturing part drawing, confirm and adjust the length and angle of the pipe to be welded (pipe 1 and pipe 2) to complete the centering and positioning. S7. Spot weld the first and second pipes to be welded, and finally perform full welding and grinding to shape to complete the butt welding.

2. The method for rapid and simple centering and positioning of butt-welded pipes according to claim 1, characterized in that, In step S1, the movable target also includes a V-shaped plate (53), with a bolt (531) vertically fixed to the tip of the V-shaped plate (53). A movable groove (521) is longitudinally opened on the longitudinal part (52). The V-shaped plate (53) is fastened to the movable groove (521) of the longitudinal part (52) by the bolt (531) and the nut (532). After loosening the nut (532), the V-shaped plate (53) can move up and down along the movable groove (521) and rotate with the axis of the bolt (531) as the rotation axis.

3. The method for rapid and simple centering and positioning of butt-welded pipes according to claim 2, characterized in that, In step S1, a pad (54) is provided between the V-shaped plate (53) and the longitudinal part (52). The pad (54) has a through hole in the center for the bolt (531) of the V-shaped plate (53) to pass through, and a slot with the same shape as the V-shaped plate is provided at one end of the pad (54). The V-shaped plate (53) is fitted into the pad (54), and the pad (54) can rotate together with the rotation of the V-shaped plate (53).

4. A rapid and simple centering and positioning method for butt-welded pipes according to any one of claims 1-3, characterized in that, In step S1, the movable target is also equipped with a binding element (6) and / or a support pad (7).

5. The method for rapid and simple centering and positioning of butt-welded pipes according to claim 1, characterized in that, In step S2, the number of horizontal targets selected is positively correlated with the total transverse length of the first and second pipes to be welded. The number of horizontal targets is reduced by adjusting the position interval of the horizontal targets.

6. The method for rapid and simple centering and positioning of butt-welded pipes according to claim 1, characterized in that, The specific steps of step S3 include: placing the first and second pipes to be welded from left to right into the opening of the right angle plate (42), and making the butt joint between the first and second pipes to be welded fall on the horizontal target.

7. A quick and simple centering and positioning method for butt-welded pipes according to claim 1, characterized in that, In step S4: When the pipe to be welded is a straight pipe, the longitudinal part (52) and the transverse part (51) of the selected moving target are fixedly connected at 90° vertically, and the longitudinal part (52) is made of V-shaped or rectangular metal. When the pipe to be welded is a bent pipe, the longitudinal part (52) of the selected moving target is made of V-shaped metal.

8. A rapid and simple centering and positioning method for butt-welded pipes according to claim 2 or 3, characterized in that, In step S4: when both the first and second pipes to be welded are bent pipes and there is a turning angle between the first and second pipes to be welded, at least one of the selected moving targets needs to be equipped with a rotatable V-shaped plate (53).

9. A rapid and simple centering and positioning method for butt-welded pipes according to claim 2 or 3, characterized in that, The specific steps of step S6 include: When the length needs to be adjusted, observe the butt weld between pipe 1 and pipe 2, and adjust the length of pipe 1 and pipe 2 by adjusting the welding interface interval between them. When both pipe 1 and pipe 2 to be welded are bent pipes and the angle needs to be adjusted, loosen the nut (532) on the moving target 2, adjust the height of the V-plate (53) so that the axis of the bolt (531) on the V-plate (53) is collinear with the central axis of the horizontal pipe section of pipe 2 to be welded, then adjust the rotation angle of the V-plate (53) so that the rotation angle meets the angle requirements of the pipe manufacturing part drawing, and finally tighten the nut (532) to realize the angle adjustment of pipe 1 and pipe 2 to be welded.

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