A pipe welding process

Abstract

This invention discloses a pipe welding process, including a support strip and an aluminum strip. One side of the support strip has an installation groove for embedding the aluminum strip. The specific steps of the pipe welding process are as follows: First, bend the support strip, creating a first gap between its two ends; Second, bend the aluminum strip into an arc shape, forming a bushing with the support strip, creating a second gap between its two ends; Third, embed one side of the bushing into the pipe's port, and fix the support strip to the inner wall of the pipe by spot welding; Fourth, fit the port of another pipe onto the bushing, forming a weld between the pipes; Fifth, weld along the weld, with the molten metal entering the weld and forming a weld pool. The aluminum strip supports the molten metal, and its outer side melts upon heating. When the molten metal enters the second gap, the support strip supports the molten metal; Sixth, the two pipes are fixedly connected together. This invention proposes a pipe welding process that can prevent weld collapse.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding technology, and in particular to a pipeline welding process. Background Technology

[0002] An air separation unit is a complete set of equipment that uses air as raw material to separate oxygen, nitrogen, argon, and other gases through cryogenic distillation. The cold box is the core component of the air separation unit, and the piping inside is welded from multiple sections of pipe.

[0003] Currently, for pipes with large diameters, double-sided welding is used, with the inner side welded by a welder who enters the pipe. For pipes with smaller diameters where entry is not possible, single-sided welding is used. During single-sided welding, molten metal can easily drip from the weld seam into the pipe, causing weld pool collapse and leading to welding defects. Summary of the Invention

[0004] In order to solve the problem that the existing single-sided welding process is prone to weld pool collapse during welding, this invention proposes a pipe welding process that can avoid weld collapse.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A pipe welding process includes a support strip and an aluminum strip. One side of the support strip has an installation groove for embedding the aluminum strip, extending through both ends of the support strip. The width and thickness of the aluminum strip are consistent with the width and depth of the installation groove, respectively. The specific steps of the pipe welding process are as follows: First, the support strip is bent into an arc shape, with the installation groove located on the outside of the support strip. A first gap is provided between the two ends of the support strip, and the outer diameter of the support strip is equal to the inner diameter of the pipe. Second, the aluminum strip is bent into an arc shape, extending circumferentially along the support strip and embedded in the installation groove. The aluminum strip and the support strip form a bushing, with the outer side of the aluminum strip flush with the outer side of the support strip. A second gap is provided between the two ends of the aluminum strip. First, the first and second gaps are staggered; third, one side of the bushing is embedded into the pipe port, and the outer circumference of the bushing is fitted with the inner circumference of the pipe, while the other side of the bushing is outside the pipe. The support strip is fixed to the inner wall of the pipe by spot welding; fourth, the port of another pipe is fitted onto the bushing, forming a weld between the pipes, with the aluminum strip located inside the weld; fifth, welding is performed along the weld, and the molten metal produced by welding enters the weld and forms a weld pool. The aluminum strip supports the molten metal, and the outer side of the aluminum strip melts after being heated. When the molten metal enters the second gap, the support strip supports the molten metal; sixth, after the molten metal and the molten aluminum strip solidify, the two pipes are fixedly connected together.

[0007] In this application, during welding, the aluminum strip supports the molten metal to prevent the weld pool from collapsing; after the aluminum strip is heated and melted, it welds the inner side of the weld, increasing the strength of the pipe weld; the support strip supports the aluminum strip to prevent it from breaking and separating from the pipe after it is heated and melted; the support strip blocks the inner side of the second gap, and when the molten metal enters the second gap, the support strip supports the molten metal, causing the weld pool at the second gap to collapse.

[0008] Furthermore, the aluminum strip includes a fixed end and a free end. In the bushing, both the fixed end and the free end are located on one side of the first gap, and the free end is located between the fixed end and the first gap. One end of the support strip is fixedly connected to the fixed end of the aluminum strip. When the bushing is embedded in the port of the pipe, the other end of the support strip is temporarily fixed to the aluminum strip. External force is applied to both ends of the support strip to bring the two ends of the support strip closer together, and the two ends of the aluminum strip also move closer together. The external dimensions of the bushing are reduced. After one side of the bushing is embedded in the port of the pipe, the two ends of the support strip are released, and the bushing is restored and fits against the inner circumference of the port of the pipe.

[0009] In this application, by utilizing the reserved first and second gaps, the outer dimensions of the bushing can be reduced after approaching both ends of the support bar, so that one side of the bushing can be embedded into the port of the pipe. After the support bar is released, the bushing recovers and fits against the inner circumference of the pipe port under the elastic action of the material.

[0010] Furthermore, the pipe welding process also includes a bushing preparation device; the bushing preparation device includes a base, a cylindrical mold fixedly connected above the base, a circular guide rail sleeved on the mold, a first drive seat that can move circumferentially along the circular guide rail, a first electric cylinder mounted on the first drive seat, and a roller rotatably connected to the end of the first electric cylinder near the mold; the outer diameter of the mold is adapted to the inner diameter of the pipe, a second electric cylinder is mounted above the mold, a first electromagnet is mounted at the end of the second electric cylinder near the mold, and a nozzle for spraying quick-drying adhesive is mounted on one side of the first electromagnet; when the bushing preparation device prepares the bushing, one end of the support bar is placed on the upper side of the mold, the second electric cylinder drives the first electromagnet, and the first electromagnet moves the support bar... One end is pressed against the mold. The first electromagnet is located on one side of the mounting groove to prevent interference with the roller. The nozzle is aligned with the mounting groove. At this time, the roller is located on the upper side of the mold. The first electric cylinder drives the roller to move downward and press the end of the support strip. The first drive seat moves one revolution along the circular guide rail. The roller squeezes the support strip, and the support strip is bent into an arc shape to fit against the mold. The first electric cylinder drives the roller away from the support strip. The nozzle sprays quick-drying adhesive into the mounting groove. The fixed end of the aluminum strip is fixed in the mounting groove by the quick-drying adhesive. The first electric cylinder drives the roller to approach the mold. The roller presses the aluminum strip into the mounting groove. The first drive seat rotates one revolution around the circular guide rail. The aluminum strip will extend along the circumference of the support strip and be embedded in the mounting groove. The bushing is now complete.

[0011] With the above setup, bushings can be prepared using a bushing preparation device, which speeds up the efficiency of pipe welding.

[0012] Furthermore, a positioning block is fixedly connected to the upper side of the mold to facilitate the positioning of the support strip. A positioning groove is provided on the upper side of the positioning block. The cross-section of the positioning block is the same as the cross-section of the support strip. After the support strip is bent, the positioning block fills the first gap. The two ends of the positioning groove are connected to the mounting groove. When the aluminum strip is bent, the positioning block supports the aluminum strip. After the aluminum strip is bent, the aluminum strip is embedded in the positioning groove.

[0013] In this application, the positioning block facilitates the positioning of the support strip. When the aluminum strip is bent, the positioning block guides and supports the aluminum strip, so that the aluminum strip can be smoothly embedded into the mounting groove when it bends from one end of the first gap to the other end of the first gap.

[0014] Furthermore, a support mechanism for supporting pipes is provided on one side of the base. A guide rail is fixedly connected to the upper side of the base, and a sliding seat that can slide along the guide rail to drive the circular guide rail towards the support mechanism. An arc-shaped guide rail is fixedly connected to the side of the circular guide rail away from the support mechanism. The arc-shaped guide rail is fixedly connected to the lower side of the arc-shaped guide rail. A second drive seat that can move along the arc-shaped guide rail is provided on the lower side of the arc-shaped guide rail. A third electric cylinder is provided on the lower side of the second drive seat. A second electromagnet is provided at the lower end of the third electric cylinder. The support bar is made of iron. The third electric cylinder drives the second electromagnet, and the second electromagnet presses the aluminum strip tightly onto the mounting groove. The positioning block is located at the first... Between the first electromagnet and the second electromagnet, the second electromagnet is closer to the aluminum strip on the side away from the support mechanism; the first electromagnet attracts one end of the support strip, and the second electromagnet attracts the other end of the support strip. The aluminum strip is temporarily fixed between the second electromagnet and the support strip. The pipe is placed horizontally on the support mechanism, with one end of the pipe facing the mold. The second drive seat moves away from the first electric cylinder along the arc guide rail. The sliding seat drives the bushing to move towards the pipe. After the bushing and the mold separate, the second drive seat moves towards the first electric cylinder along the arc guide rail to reduce the outer size of the bushing. One side of the bushing enters the port of the pipe. The first electromagnet and the second electromagnet release the two ends of the support strip.

[0015] With the above setup, the first electromagnet attracts one end of the support strip, and the second electromagnet attracts the other end of the support strip, temporarily fixing the aluminum strip at the same time. After the bushing is prepared, the bushing is first opened to loosen the bushing and the mold. After the bushing leaves the mold, the bushing is shrunk. After the bushing is embedded in the pipe, the first electromagnet and the second electromagnet loosen the bushing, and the bushing is restored and fits against the inner circumference of the pipe.

[0016] Furthermore, the support mechanism includes a support base fixedly connected to the upper side of the base. The upper side of the support base is provided with a groove for embedding a pipe. The groove and the outer diameter of the pipe are adapted to increase the stability of the pipe.

[0017] Furthermore, the mold is fixedly connected to the base via support columns. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the bushing preparation apparatus for an embodiment.

[0019] Figure 2 for Figure 1 Enlarged view of point A.

[0020] Figure 3 This is a side view of the bushing preparation apparatus according to an embodiment.

[0021] Figure 4 for Figure 3 Enlarged view of point B.

[0022] Figure 5 This is a schematic diagram showing one end of the support bar being pressed down by the first electromagnet.

[0023] Figure 6 This is a schematic diagram showing how the support bar bends after the rollers move.

[0024] Figure 7 This is a diagram showing the nozzle spraying quick-drying adhesive into the mounting slot.

[0025] Figure 8 This is a schematic diagram showing one end of an aluminum strip fixed in the mounting groove with quick-drying adhesive.

[0026] Figure 9 This is a schematic diagram showing how the aluminum strip is embedded in the mounting groove after the roller moves.

[0027] Figure 10 This is a schematic diagram showing the opening of both ends of the support bar after the second drive seat moves.

[0028] Figure 11 This is a schematic diagram showing how the two ends of the support bar come together after the second drive seat moves.

[0029] Figure 12 A schematic diagram showing a pipe embedded on one side of the bushing.

[0030] Figure 13 This is a schematic diagram of another pipe fitted onto the other side of the bushing.

[0031] Figure 14 for Figure 13 CC section view. Detailed Implementation

[0032] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0033] See Figures 1 to 14A pipe welding process includes a support strip 11 and an aluminum strip 12. One side of the support strip 11 has an installation groove 111 into which the aluminum strip 12 can be embedded. The installation groove 111 extends through both ends of the support strip 11. The width and thickness of the aluminum strip 12 are consistent with the width and depth of the installation groove 111, respectively. The specific steps of the pipe welding process are as follows: First, the support strip 11 is bent into an arc shape. The installation groove 111 is located on the outside of the support strip 11. A first gap 112 is provided between the two ends of the support strip 11. The outer diameter of the support strip 11 is equal to the inner diameter of the pipe 21. Second, the aluminum strip 12 is bent into an arc shape. The aluminum strip 12 extends circumferentially along the support strip 11 and is embedded in the installation groove 111. The aluminum strip 12 and the support strip 11 form a bushing 13. The outer side of the aluminum strip 12 is flush with the outer side of the support strip 11. A second gap 112 is provided between the two ends of the aluminum strip 12. The first gap 112 and the second gap 121 are staggered; third, one side of the bushing 13 is embedded into the port of the pipe 21, and the outer periphery of the bushing 13 is fitted with the inner periphery of the pipe 21, while the other side of the bushing 13 is located outside the pipe 21. The support strip 11 is fixed to the inner wall of the pipe 21 by spot welding; fourth, the port of another pipe 21 is fitted onto the bushing 13, forming a weld 22 between the pipes 21, with the aluminum strip 12 located inside the weld 22; fifth, welding is performed along the weld 22, and the molten metal produced by welding enters the weld 22 and forms a weld pool. The aluminum strip 12 supports the molten metal, and the outer side of the aluminum strip 12 melts after being heated. When the molten metal enters the second gap 121, the support strip 11 supports the molten metal; sixth, after the molten metal and the molten aluminum strip 12 solidify, the two pipes 21 are fixedly connected together.

[0034] In this application, during welding, the aluminum strip 12 supports the molten metal to prevent the weld pool from collapsing; after the aluminum strip 12 melts due to heat, it welds the inner side of the weld 22, increasing the strength of the weld on the pipe 21; the support strip 11 supports the aluminum strip 12 to prevent it from breaking and detaching from the pipe 21 after melting due to heat; see also Figure 14 The support bar 11 blocks the inside of the second gap 121. When the molten metal enters the second gap 121, the support bar 11 supports the molten metal, and the weld pool at the second gap 121 collapses.

[0035] Specifically, the support strip 11 and aluminum strip 12 are initially straight structures. Support strip 11 and aluminum strip 12 are cut to corresponding lengths according to the inner diameter of the pipe 21. After the aluminum strip 12 is embedded in the mounting groove 111, the outer side of the aluminum strip 12 is flush with the outer side of the support strip 11. When the bushing 13 is embedded in the pipe 21, the outer sides of the aluminum strip 12 and support strip 11 fit against the inner side of the pipe 21 to prevent weld pool collapse. Before installing the second pipe 21, the support strip 11 and pipe 21 are first fixed together by spot welding. See [link to documentation]. Figure 12 This prevents the bushing 13 from shifting when the second pipe 21 is installed.

[0036] In one implementation, the aluminum strip 12 includes a fixed end 122 and a free end 123. In the bushing 13, both the fixed end 122 and the free end 123 are located on one side of the first gap 112, and the free end 123 is located between the fixed end 122 and the first gap 112. One end of the support strip 11 is fixedly connected to the fixed end 122 of the aluminum strip 12. When the bushing 13 is embedded in the port of the pipe 21, the other end of the support strip 11 is temporarily fixed to the aluminum strip 12. An external force is applied to both ends of the support strip 11 to bring the two ends of the support strip 11 closer together, and the two ends of the aluminum strip 12 also move closer together accordingly. The external dimensions of the bushing 13 are reduced. After one side of the bushing 13 is embedded in the port of the pipe 21, the two ends of the support strip 11 are released, and the bushing 13 is restored and fits against the inner circumference of the port of the pipe 21.

[0037] In this application, by utilizing the reserved first gap 112 and second gap 121, after approaching both ends of the support bar 11, the external size of the bushing 13 can be reduced so that one side of the bushing 13 can be embedded into the port of the pipe 21. After the support bar 11 is released, under the elastic action of the material, the bushing 13 recovers and fits against the inner circumference of the port of the pipe 21.

[0038] Specifically, the free end 123 of the aluminum strip is located between the fixed end and the first gap and can move relative to the support strip. After temporarily fixing the other end of the support strip and the aluminum strip, the two ends of the support strip can move the two ends of the aluminum strip closer together, thereby reducing the external size of the bushing and making it easier to embed the bushing into the pipe.

[0039] As one implementation method, the pipe welding process also includes a bushing preparation device; the bushing preparation device includes a base 141, a cylindrical mold 142 fixedly connected above the base 141, a circular guide rail 143 sleeved on the mold 142, a first drive seat 144 movable circumferentially along the circular guide rail 143, a first electric cylinder 145 mounted on the first drive seat 144, and a roller 146 rotatably connected to one end of the first electric cylinder 145 near the mold 142; the mold 142 The outer diameter of the mold 142 is adapted to the inner diameter of the pipe 21. A second electric cylinder 147 is provided above the mold 142. A first electromagnet 148 is provided at one end of the second electric cylinder 147 near the mold 142. A nozzle 149 for spraying quick-drying adhesive is provided on one side of the first electromagnet 148. When the bushing preparation device prepares the bushing 13, one end of the support bar 11 is placed on the upper side of the mold 142. The second electric cylinder 147 drives the first electromagnet 148, and the first electromagnet 148 presses one end of the support bar 11 tightly against the mold. On mold 142, the first electromagnet 148 is located on one side of the mounting groove 111 to prevent interference with the roller 146. The nozzle 149 is aligned with the mounting groove 111. At this time, the roller 146 is located on the upper side of the mold 142. The first electric cylinder 145 drives the roller 146 to move downward and press the end of the support bar 11. The first drive seat 144 moves one revolution along the circular guide rail 143. The roller 146 squeezes the support bar 11, and the support bar 11 is bent into an arc shape to fit against the mold 142. Cylinder 145 drives roller 146 away from support bar 11, nozzle 149 sprays quick-drying adhesive into mounting groove 111, fixing the fixed end of aluminum strip 12 in mounting groove 111 with quick-drying adhesive. First electric cylinder 145 drives roller 146 closer to mold 142, roller 146 presses aluminum strip 12 into mounting groove 111, first drive seat 144 rotates around circular guide rail 143 for one revolution, aluminum strip 12 will extend along the circumference of support bar 11 and be embedded in mounting groove 111, bushing 13 is completed.

[0040] With the above setup, the bushing 13 can be prepared using the bushing preparation device, which speeds up the welding efficiency of the pipe 21.

[0041] Specifically, when the bushing preparation device prepares the bushing 13, one end of the support bar 11 is placed on the upper side of the mold 142. The second electric cylinder 147 drives the first electromagnet 148, which presses one end of the support bar 11 onto the mold 142. See [link to relevant documentation]. Figure 5 At this time, the other end of the support bar 11 extends to the left; the first electromagnet 148 is located on one side of the mounting groove 111, see... Figure 2To prevent interference with roller 146, nozzle 149 is aligned with mounting groove 111, and the output end of nozzle 149 is located to the left of first electromagnet 148. At this time, roller 146 is located above mold 142. First electric cylinder 145 drives roller 146 to move downward and press the end of support bar 11. First drive seat 144 moves counterclockwise one revolution along circular guide rail 143. Roller 146 squeezes support bar 11, and support bar 11 is bent into an arc shape to fit against mold 142. See [link to relevant documentation]. Figure 6 The first electric cylinder 145 drives the roller 146 away from the support bar 11, and the nozzle 149 sprays quick-drying adhesive into the mounting groove 111. (See attached image) Figure 7 One end of the aluminum strip 12 is fixed in the mounting groove 111 with quick-drying adhesive. At this time, the other end of the aluminum strip 12 extends to the left and tilts downward. See [reference needed]. Figure 8 The first electric cylinder 145 drives the roller 146 to approach the mold 142. The roller 146 presses the aluminum strip 12 into the mounting groove 111. The first drive seat 144 rotates counterclockwise around the circular guide rail 143 for one revolution. (See below) Figure 9 The aluminum strip 12 will extend circumferentially along the support strip 11 and be embedded in the mounting groove 111, thus completing the preparation of the bushing 13.

[0042] As one implementation, a positioning block 1421 is fixedly connected to the upper side of the mold 142 to facilitate the positioning of the support bar 11. A positioning groove 1422 is provided on the upper side of the positioning block 1421. The cross-section of the positioning block 1421 is the same as the cross-section of the support bar 11. After the support bar 11 is bent, the positioning block 1421 fills the first gap 112. The two ends of the positioning groove 1422 are connected to the mounting groove 111. When the aluminum strip 12 is bent, the positioning block 1421 supports the aluminum strip 12. After the aluminum strip 12 is bent, the aluminum strip 12 is embedded in the positioning groove 1422.

[0043] In this application, the positioning block 1421 facilitates the positioning of the support strip 11. When bending the aluminum strip 12, the positioning block 1421 guides and supports the aluminum strip 12, so that when the aluminum strip 12 bends from one end of the first gap 112 to the other end of the first gap 112, it can be smoothly embedded into the mounting groove 111.

[0044] Specifically, when preparing the bushing 13, one end of the support bar 11 is first placed against the upper side of the mold 142 and against the left side of the positioning block 1421, see [reference]. Figure 5 After the first electromagnet 148 and roller 146 press the support bar 11 together, the first drive seat 144 rotates counterclockwise around the circular guide rail 143 for one revolution, and the support bar 11 is attached to the mold 142. The other end of the support bar 11 is located on the right side of the positioning block 1421. (See below) Figure 6 .

[0045] As one implementation, a support mechanism for supporting the pipe 21 is provided on one side of the base 141. A guide rail 1411 is fixedly connected to the upper side of the base 141, and a sliding seat 1412 that can slide along the guide rail 1411 to drive the circular guide rail 143 to move toward the support mechanism. An arc guide rail 1431 is fixedly connected to the side of the circular guide rail 143 away from the support mechanism. The arc guide rail 1431 is fixedly connected to the lower side of the arc guide rail 1431. A second drive seat 1432 that can move along the arc guide rail 1431 is provided on the lower side of the arc guide rail 1431. A third electric cylinder 1433 is provided on the lower side of the second drive seat 1432. A second electromagnet 1434 is provided at the lower end of the third electric cylinder 1433. The support bar 11 is made of iron. The third electric cylinder 1433 drives the second electromagnet 1434, and the second electromagnet 1434 presses the aluminum bar 12 into the mounting groove 111. The positioning block 1421 is positioned... Between the first electromagnet 148 and the second electromagnet 1434, the second electromagnet 1434 is closer to the side of the aluminum strip 12 away from the support mechanism; the first electromagnet 148 attracts one end of the support strip 11, and the second electromagnet 1434 attracts the other end of the support strip 11. The aluminum strip 12 is temporarily fixed between the second electromagnet 1434 and the support strip 11. The pipe 21 is placed horizontally on the support mechanism, with one end of the pipe 21 facing the mold 142. The second drive seat 1432 moves away from the first electric cylinder 145 along the arc guide rail 1431. The sliding seat 1412 drives the bushing 13 to move toward the pipe 21. After the bushing 13 and the mold 142 separate, the second drive seat 1432 moves toward the first electric cylinder 145 along the arc guide rail 1431 to reduce the external size of the bushing 13. One side of the bushing 13 enters the port of the pipe 21. The first electromagnet 148 and the second electromagnet 1434 release the two ends of the support strip 11.

[0046] With the above setup, the first electromagnet 148 attracts one end of the support bar 11, and the second electromagnet 1434 attracts the other end of the support bar 11 while temporarily fixing the aluminum strip 12. After the bushing 13 is prepared, the bushing 13 is first opened to loosen the bushing 13 and the mold 142. After the bushing 13 leaves the mold 142, the bushing 13 is shrunk. After the bushing 13 is embedded in the pipe 21, the first electromagnet 148 and the second electromagnet 1434 loosen the bushing 13, and the bushing 13 is restored and attached to the inner circumference of the pipe 21.

[0047] Specifically, the support mechanism supports the pipe 21, with one end of the pipe 21 facing the mold 142, allowing the movable bushing 13 to be inserted into the port of the pipe 21. After the bushing 13 is prepared, the third electric cylinder 1433 drives the second electromagnet 1434 downwards and presses it against the aluminum strip 12. The first electromagnet 148 attracts one end of the support strip 11, and the second electromagnet 1434 attracts the other end of the support strip 11. The free end 123 of the aluminum strip 12 is clamped by the second electromagnet 1434 and the support strip 11. (See [reference]). Figure 9When the second drive seat 1432 rotates to the right around the arc guide rail 1431, the second drive seat 1432 drives the second electromagnet 1434 to move to the right. The distance between the two ends of the support bar 11 increases, and the distance between the two ends of the aluminum bar 12 increases. The support bar 11 and the aluminum bar 12 are spread apart, and the support bar 11 and the mold 142 are released. See [link / reference] Figure 10 When the sliding seat 1412 drives the circular guide rail 143 to move towards the pipe 21, the mold 142 is slowly pulled out of the bushing 13. After the bushing 13 and the mold 142 separate, the second driving seat 1432 moves to the left along the arc guide rail 1431, and the two ends of the support bar 11 move closer together, and the two ends of the aluminum bar 12 move closer together. See [reference needed] Figure 11 The outer dimensions of bushing 13 are reduced, and sliding seat 1412 moves along guide rail 1411 towards the support mechanism. Sliding seat 1412 drives circular guide rail 143 and bushing 13 to move towards the port of pipe 21. When one side of bushing 13 is embedded in pipe 21, see... Figure 12 At this time, about half the width of the aluminum strip 12 is embedded in the pipe 21, about half the width of the support strip 11 is embedded in the pipe 21, and during the process of the bushing 13 being embedded in the pipe 21, the first electric cylinder 145 drives the roller 146 to move upward to prevent the pipe 21 and the roller 146 from interfering during the process of the bushing 13 being embedded in the pipe 21.

[0048] As one implementation, the support mechanism includes a support base 1501 fixedly connected to the upper side of the base 141. The upper side of the support base 1501 is provided with a groove 1502 into which the pipe 21 can be embedded. The groove 1502 and the outer diameter of the pipe 21 are adapted to increase the stability of the pipe 21.

[0049] In one implementation, the mold 142 is fixedly connected to the base 141 via a support column.

[0050] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A pipe welding process, characterized by, The support strip is provided with a mounting groove on one side, which can embed the aluminum strip, the mounting groove penetrates through both ends of the support strip, and the width and thickness of the aluminum strip are consistent with the width and depth of the mounting groove respectively; The specific steps of the pipeline welding process are as follows: First, bend the support strip to make it present a circular arc shape, the mounting groove is located on the outer side of the support strip, a first gap is arranged between both ends of the support strip, and the outer diameter of the support strip is equal to the inner diameter of the pipeline; Second, bend the aluminum strip into a circular arc shape, the aluminum strip extends along the circumferential direction of the support strip and is embedded in the mounting groove, the aluminum strip and the support strip form a bushing, the outer side of the aluminum strip is flush with the outer side of the support strip, a second gap is arranged between both ends of the aluminum strip, and the first gap and the second gap are staggered; Third, embed one side of the bushing into the port of the pipeline, and make the outer periphery of the bushing fit the inner periphery of the pipeline, the other side of the bushing is located outside the pipeline, and the support strip is fixed on the inner wall of the pipeline through spot welding; Fourth, sleeve the port of another pipeline on the bushing, form a weld between the pipelines, and arrange the aluminum strip on the inner side of the weld; Fifth, weld along the weld, the molten metal generated by welding enters the weld and forms a weld pool, the aluminum strip supports the molten metal, and the outer side of the aluminum strip melts after being heated, and the support strip supports the molten metal when the molten metal enters the second gap; Sixth, after the molten metal and the molten aluminum solidify, the two pipelines are fixedly connected together; The aluminum strip includes a fixed end and a free end, both the fixed end and the free end are located on one side of the first gap in the bushing, the free end is located between the fixed end and the first gap, and one end of the support strip is fixedly connected with the fixed end of the aluminum strip; When the bushing is embedded into the port of the pipeline, the other end of the support strip and the aluminum strip are temporarily fixed, an external force is applied to both ends of the support strip to make both ends of the support strip close to each other, both ends of the aluminum strip also correspondingly close to each other, and the external dimension of the bushing is reduced, after the one side of the bushing is embedded into the port of the pipeline, the both ends of the support strip are loosened, and the bushing fits the inner periphery of the port of the pipeline after recovering; The pipeline welding process also includes a bushing preparation device; The bushing preparation device includes a base, a cylindrical mold fixedly connected above the base, a circular guide rail sleeved on the mold, a first driving seat movable along the circumferential direction of the circular guide rail, a first electric cylinder arranged on the first driving seat, and a roller rotatably connected to one end of the first electric cylinder close to the mold; the outer diameter of the mold is adapted to the inner diameter of the pipeline, a second electric cylinder is arranged above the mold, a first electromagnet is arranged on one side of the second electric cylinder close to the mold, and a nozzle for spraying quick-drying glue is arranged on one side of the first electromagnet. When the bushing preparation device prepares the bushing, one end of the support strip is placed on the upper side of the mold, the second electric cylinder drives the first electromagnet, the first electromagnet presses one end of the support strip tightly on the mold, the first electromagnet is located on one side of the mounting groove to prevent interference with the roller, and the nozzle is aligned with the mounting groove. At this time, the roller is located on the upper side of the mold, the first electric cylinder drives the roller to move downward and press the end of the support strip, the first driving seat moves along the circular guide rail for one circle, the roller extrudes the support strip, and the support strip is bent into an arc shape to fit on the mold; the first electric cylinder drives the roller away from the support strip, the nozzle sprays quick-drying glue into the mounting groove, and the fixed end of the aluminum strip is fixed in the mounting groove through the quick-drying glue. The first electric cylinder drives the roller to approach the mold, the roller presses the aluminum strip tightly in the mounting groove, the first driving seat rotates around the circular guide rail for one circle, the aluminum strip will extend along the circumference of the support strip and be embedded in the mounting groove, and the preparation of the bushing is completed; the upper side of the mold is fixedly connected with a positioning block convenient for positioning the support strip, the upper side of the positioning block is provided with a positioning groove, the cross section of the positioning block is consistent with the cross section of the support strip, the positioning block fills the first gap after the support strip is bent, and the two ends of the positioning groove are communicated with the mounting groove. When the aluminum strip is bent, the positioning block supports the aluminum strip, and after the aluminum strip is bent, the aluminum strip is embedded in the positioning groove; One side of the base is provided with a support mechanism capable of supporting the pipeline, the upper side of the base is fixedly connected with a guide rail, and a sliding seat capable of sliding along the guide rail to drive the circular guide rail to move towards the support mechanism is fixedly connected with the guide rail. The side of the circular guide rail away from the support mechanism is fixedly connected with a circular arc guide rail, and the circular arc guide rail is fixedly connected to the lower side of the circular arc guide rail. The lower side of the circular arc guide rail is provided with a second driving seat capable of moving along the circular arc guide rail, the lower side of the second driving seat is provided with a third electric cylinder, the lower end of the third electric cylinder is provided with a second electromagnet, and the material of the support strip is iron. The third electric cylinder drives the second electromagnet, the second electromagnet presses the aluminum strip tightly on the mounting groove, the positioning block is located between the first electromagnet and the second electromagnet, and the second electromagnet is close to the side of the aluminum strip away from the support mechanism. The first electromagnet adsorbs one end of the support strip, the second electromagnet adsorbs the other end of the support strip, the aluminum strip is temporarily fixed between the second electromagnet and the support strip, the pipeline is transversely placed on the support mechanism, one end of the pipeline faces the mold, the second driving seat moves away from the first electric cylinder along the circular arc guide rail, the sliding seat drives the bushing to move towards the pipeline, after the bushing and the mold are separated, the second driving seat moves towards the first electric cylinder along the circular arc guide rail to reduce the external size of the bushing, one side of the bushing enters the port of the pipeline, and the first electromagnet and the second electromagnet loosen the two ends of the support strip.

2. A pipe welding process according to claim 1, characterised in that The support mechanism comprises a support seat fixedly connected to the upper side of the base, and the upper side of the support seat is provided with a groove capable of being embedded in the pipeline. The groove and the outer diameter of the pipeline are matched to increase the stability of the pipeline.

3. A pipe welding process according to claim 1, characterised in that The mold is fixedly connected with the base through the supporting column.

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