Adjustable pipeline inside weld argon protection device and protection method

Abstract

The application relates to a kind of adjustable pipeline inner weld argon filling protection device and protection method, belong to welding technical field.The application is to solve the problem that the protection range of manual tungsten argon arc welding torch is limited, welding pool heat is large, high temperature time is long, cooling speed is slow, and the quality of welding organization performance cannot reach the production and manufacturing requirements, so the protection range of welding torch is not enough.The application comprises a gas inlet assembly, a supporting assembly and a sealing protective cover;the gas inlet assembly is coaxially inserted into the pipeline and is radially supported by the supporting assembly;the sealing protective cover is sleeved on the end of the gas inlet assembly and forms an annular cavity with the inner wall of the pipeline;the end of the gas inlet assembly is provided with an exhaust hole, and the sealing protective cover is provided with a plurality of exhaust holes;argon gas flows through the exhaust holes of the end of the gas inlet assembly and the exhaust holes of the sealing protective cover in sequence and enters the annular cavity, so as to realize the positioning argon flushing of the pipeline.The application is mainly used for pipeline weld argon filling.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, and particularly relates to an adjustable argon purging protection device and method for the inner weld seam of a pipe. Background Technology

[0002] During the welding of superheater headers for a certain project, a manual tungsten inert gas (TIG) welding machine was used. The pipe joint lengths for this product ranged from 1.5m to 5m, and the pipe inner diameters ranged from Φ169mm to Φ277mm. Due to the limited protection range of the manual TIG welding torch, the weld pool was hot, the high temperature time was long, and the cooling rate was slow, resulting in the post-weld microstructure and quality failing to meet manufacturing requirements. Therefore, relying solely on the protection range of the welding torch was insufficient; argon purging was required to protect the inner weld seams of the 1.5m to 5m pipe lengths. Summary of the Invention

[0003] The technical problem to be solved by this invention is that the protection range of the manual tungsten inert gas welding torch is limited, the welding pool has high heat, long high temperature time, and slow cooling rate, and the quality of the post-weld microstructure and properties does not meet the production and manufacturing requirements. Therefore, the protection range of the welding torch alone is insufficient. Therefore, this invention provides an adjustable argon purging protection device and protection method for the inner weld seam of a pipe.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0005] An adjustable argon-filled protective device for the inner weld seam of a pipeline includes an inlet assembly, a support assembly, and a sealing protective cover. The inlet assembly is coaxially inserted into the pipeline and radially supported by the support assembly. The sealing protective cover is fitted over the end of the inlet assembly and forms an annular cavity with the inner wall of the pipeline. The end of the inlet assembly has an exhaust port, and the sealing protective cover has several exhaust ports. Argon gas flows sequentially through the exhaust ports at the end of the inlet assembly and the exhaust ports on the sealing protective cover and enters the annular cavity, thereby achieving argon-filled positioning of the pipeline.

[0006] Furthermore, the air intake assembly includes an air intake pipe, a connecting pipe, and an air outlet pipe connected in sequence, with adjacent pipes connected by a set of connecting joints.

[0007] Furthermore, the end of the vent pipe is a closed end, and several exhaust holes are opened on the outer circumferential wall of the vent pipe near the end.

[0008] Furthermore, each set of connecting joints includes a cylindrical connecting nut and a cylindrical connecting screw, the connecting nut and the connecting screw being threaded together, the end of the connecting nut away from the connecting screw being inserted into the end of one of the adjacent pipes, and the end of the connecting screw away from the connecting nut being inserted into the end of the other pipe.

[0009] Furthermore, the support assembly includes a positioning end cap and several support steel plates; the positioning end cap is installed at the port of the pipe and seals the end of the pipe, the several support steel plates are radially installed inside the pipe, and the air intake assembly is axially inserted into the positioning end cap and the support steel plates.

[0010] Furthermore, a positioning sleeve is provided on the positioning end cover and on each supporting steel plate, and the air intake assembly is fixed by the positioning sleeve;

[0011] The positioning sleeve includes a sleeve and two set screws. The sleeve is fixedly connected to the positioning end cap or supporting steel plate, and the two set screws are radially screwed onto the sleeve to tighten the air intake assembly.

[0012] Furthermore, the sealing protective cover includes a cylindrical ring with numerous circular holes and two end plates, with the two end plates respectively installed at both ends of the cylindrical ring.

[0013] Furthermore, a sealing copper plate is provided at each end of the sealing protective cover. The sealing copper plate is sleeved outside the air outlet pipe and radially arranged inside the pipe, and is interference-fitted with the inner wall of the pipe.

[0014] Furthermore, the two sealing copper plates are axially clamped and positioned by a positioning sleeve and two positioning nuts, wherein the positioning sleeve is fitted on the vent pipe and located on the inner sealing copper plate, and the two positioning nuts are screwed to the end of the vent pipe and located on the outer sealing copper plate.

[0015] An argon purging protection method for the inner weld seam of a pipeline, the specific protection process is as follows:

[0016] Step 1: Select a suitable connecting pipe according to the docking length of the header pipe, and connect the air inlet pipe and air outlet pipe by threading.

[0017] Step 2: Place the sealing cover over the exhaust port of the exhaust pipe and adjust the opening position of the exhaust pipe so that the opening position of the exhaust pipe corresponds to the opening position of the inner ring of the sealing cover.

[0018] Step 3: Install a sealing copper plate on the outside of the sealing protective cover and lock it in place using a sealing washer and two positioning nuts; install a sealing copper plate on the inside of the sealing protective cover and fix it in place using a positioning sleeve.

[0019] Step 4: Select appropriate positions on the air inlet pipe, connecting pipe and air outlet pipe respectively to install the support steel plate, and use the positioning sleeve to lock and fix it.

[0020] Step 5: Install the positioning end cap to the end of the header pipe, lock it in place using the positioning sleeve, and adjust the length of the air intake assembly extending into the pipe so that the exhaust port of the sealing protective cover is at the position where the pipe is to be filled with argon.

[0021] Step 6: After connecting the gas inlet pipe to the argon filling pipeline, open the argon filling pipeline to restart the argon gas protection inside the pipeline. When the argon gas concentration reaches the standard, perform the welding operation on the target pipeline.

[0022] The beneficial effects of this invention compared to the prior art are:

[0023] 1. The present invention employs an adjustable argon purging protection device for the inner weld seam of the pipeline, which ensures a safe working environment for workers and improves their work efficiency. At the same time, the protection device has a simple structure and is easy to operate, which improves the welding efficiency of the superheater header, ensures product quality, shortens the processing cycle, and solves the technical problem that the microstructure and performance quality of the header pipeline after butt welding do not meet the production and manufacturing requirements.

[0024] 2. This invention adjusts the length of the air inlet pipe through the air inlet assembly, and with the synergistic effect of the sealing protective cover, argon gas is evenly introduced into the weld area inside the pipe, realizing the fixed-point argon filling of the pipe and ensuring the concentration of argon gas. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are provided to further illustrate the invention.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the intake pipe.

[0028] Figure 3 This is a schematic diagram of the connecting pipe.

[0029] Figure 4 This is a schematic diagram of the air outlet pipe.

[0030] Figure 5 This is a schematic diagram of the connection joint.

[0031] Figure 6 This is a schematic diagram of the structure of the sealed protective cover.

[0032] Figure 7 This is a schematic diagram of the positioning end cap.

[0033] Figure 8 for Figure 1 A magnified view of a portion of point A in the middle.

[0034] Figure 9 This is a schematic diagram of the positioning sleeve.

[0035] Explanation of reference numerals in the attached drawings: 1-Intake assembly; 1-1-Intake pipe; 1-2-Connecting pipe; 1-3-Outtake pipe; 1-4-Connecting joint; 1-4-1-Connecting nut; 1-4-2-Connecting screw; 2-Support assembly; 2-1-Positioning end cap; 2-2-Supporting steel plate; 2-3-Positioning sleeve; 2-3-1-Sleeve; 2-3-2-Setting screw; 3-Sealing protective cover; 3-1-Exhaust hole; 3-2-Cylinder ring; 3-3-End plate; 4-Pipeline; 5-Annular cavity; 6-Sealing copper plate; 7-Sealing washer; 8-Positioning nut. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] See Figure 1 This application provides an adjustable argon purging protection device for the inner weld seam of a pipeline, comprising an inlet assembly 1, a support assembly 2, and a sealing protective cover 3. The inlet assembly 1 is coaxially inserted into the pipeline 4 and is radially supported by the support assembly 2. The sealing protective cover 3 is fitted onto the end of the inlet assembly 1 and forms an annular cavity 5 with the inner wall of the pipeline 4. The end of the inlet assembly 1 has an exhaust port, and the sealing protective cover 3 has several exhaust ports 3-1. Argon gas flows sequentially through the exhaust port at the end of the inlet assembly 1 and the exhaust ports 3-1 on the sealing protective cover 3 and enters the annular cavity 5 evenly, and then reaches the inner weld seam area of ​​the pipeline 4, thereby achieving argon purging of the pipeline 4.

[0038] See Figure 2 , Figure 3 , Figure 4 and Figure 5 The air intake assembly 1 includes three pipes: an intake pipe 1-1, a connecting pipe 1-2, and an outlet pipe 1-3 connected in sequence. Adjacent pipes are connected by a set of connecting joints 1-4. One end of the intake pipe 1-1 is provided with an intake pipe connector for connecting to a gas filling device. The connecting pipe 1-2 is used to adjust the length of the air intake assembly 1. By changing the connecting pipe 1-2 of different lengths, argon filling of pipes 4 of different lengths can be achieved.

[0039] Furthermore, the end of the gas outlet pipe 1-3 is a closed end, and several exhaust holes are opened on the outer circumferential wall of the gas outlet pipe 1-3 near the end, so as to realize the purpose of argon gas discharge and pipeline positioning and argon filling.

[0040] Furthermore, each set of connecting joints 1-4 includes a cylindrical connecting nut 1-4-1 and a cylindrical connecting screw 1-4-2. The connecting nut 1-4-1 and the connecting screw 1-4-2 are threaded together. The end of the connecting nut 1-4-1 away from the connecting screw 1-4-2 is inserted into the end of one of the adjacent pipes, and the end of the connecting screw 1-4-2 away from the connecting nut 1-4-1 is inserted into the end of another pipe.

[0041] See Figure 1 , Figure 7 and Figure 9 The support assembly 2 includes a positioning end cap 2-1 and several support steel plates 2-2. The positioning end cap 2-1 is installed at the port of the pipe 4 and seals the end of the pipe 4. The several support steel plates 2-2 are radially installed inside the pipe 4. The air intake assembly 1 is axially inserted into the positioning end cap 2-1 and the support steel plates 2-2. The use of multiple sets of support steel plates 2-2 enhances the overall rigidity of the tooling, provides central positioning for the protective device, and ensures that the tooling is stably and tightly fitted to the inner wall of the weld during use.

[0042] Furthermore, a positioning sleeve 2-3 is provided on the positioning end cover 2-1 and on each supporting steel plate 2-2, and the air intake assembly 1 is fixed by the positioning sleeve 2-3.

[0043] Furthermore, the positioning sleeve 2-3 includes a sleeve 2-3-1 and two set screws 2-3-2. The sleeve 2-3-1 is fixedly connected to the positioning end cap 2-1 or the supporting steel plate 2-2. The two set screws 2-3-2 are radially screwed onto the sleeve 2-3-1 and tighten the air intake assembly 1.

[0044] See Figure 6 The sealing protective cover 3 includes a cylindrical ring 3-2 with holes and two end plates 3-3, with the two end plates 3-3 respectively installed at both ends of the cylindrical ring 3-2.

[0045] Furthermore, a sealing copper plate 6 is respectively provided at both ends of the sealing protective cover 3. The sealing copper plate 6 is sleeved outside the air outlet pipe 1-3 and radially arranged inside the pipe 4, and is interference-fitted with the inner wall of the pipe 4. The sealing copper plate 6 is made of H62 copper plate to prevent the sealing plate from sticking to the pipe body due to excessive welding heat.

[0046] Furthermore, the two sealing copper plates 6 are axially clamped and positioned by a positioning sleeve 2-3 and two positioning nuts 8. The positioning sleeve 2-3 is fitted on the air outlet pipe 1-3 and is located on the inner sealing copper plate 6, while the two positioning nuts 8 are screwed to the end of the air outlet pipe 1-3 and are located on the outer sealing copper plate 6.

[0047] Furthermore, a sealing washer 7 is provided between the positioning nut 8 and the sealing copper plate 6.

[0048] This application provides a method for argon purging protection of the inner weld seam of a pipeline, and the specific protection process is as follows:

[0049] Step 1: Select the appropriate connecting pipe 1-2 according to the docking length of the header pipe, and connect the air inlet pipe 1-1 and the air outlet pipe 1-3 by threaded connection and set them aside for use;

[0050] Step 2: Place the sealing protective cover 3 on the exhaust port of the vent pipe 1-3, and adjust the opening position of the vent pipe 1-3 so that the opening position of the vent pipe 1-3 corresponds to the opening position of the inner ring 3-2 of the sealing protective cover 3.

[0051] Step 3: Install a sealing copper plate 6 on the outside of the sealing protective cover 3 and lock it in place using a sealing washer 7 and two positioning nuts 8; install a sealing copper plate 6 on the inside of the sealing protective cover 3 and fix it in place using positioning sleeves 2-3.

[0052] Step 4: Select appropriate positions on the air inlet pipe 1-1, connecting pipe 1-2 and air outlet pipe 1-3 respectively to install the support steel plate 2-2, and use the positioning sleeve 2-3 to lock and fix it.

[0053] Step 5: Install the positioning end cap 2-1 to the end of the header pipe, lock and fix it with the positioning sleeve 2-3, and adjust the length of the air intake assembly 1 extending into the pipe so that the exhaust port of the sealing protective cover 3 is at the position where the pipe is to be filled with argon.

[0054] Step 6: After connecting the inlet pipe 1-1 to the argon filling pipeline, open the argon filling pipeline and restart the argon gas protection inside the pipeline. When the argon gas concentration reaches the standard, perform the welding operation on the target pipeline.

[0055] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. An adjustable argon-filled protective device for the inner weld seam of a pipeline, characterized in that: It includes an air intake assembly (1), a support assembly (2), and a sealing protective cover (3); the air intake assembly (1) is coaxially inserted into the pipe (4) and is radially supported by the support assembly (2); the sealing protective cover (3) is fitted onto the end of the air intake assembly (1) and forms an annular cavity (5) with the inner wall of the pipe (4); the end of the air intake assembly (1) has an exhaust hole, and the sealing protective cover (3) has several exhaust holes (3-1). Argon gas flows sequentially through the exhaust hole at the end of the air intake assembly (1) and the exhaust hole (3-1) on the sealing protective cover (3) and enters the annular cavity (5), thereby achieving the positioning and argon flushing of the pipe (4); The air intake assembly (1) includes three pipes, namely an air intake pipe (1-1), a connecting pipe (1-2), and an air outlet pipe (1-3) connected in sequence. Adjacent pipes are connected by a set of connecting joints (1-4). The end of the vent pipe (1-3) is a closed end, and several exhaust holes are opened on the outer circumferential wall of the vent pipe (1-3) near the end. The sealing protective cover (3) includes a cylindrical ring (3-2) with holes and two end plates (3-3), the two end plates (3-3) being installed at both ends of the cylindrical ring (3-2); A sealing copper plate (6) is provided at each end of the sealing protective cover (3). The sealing copper plate (6) is sleeved outside the air outlet pipe (1-3) and radially arranged inside the pipe (4), and is interference-fitted to the inner wall of the pipe (4).

2. The adjustable argon-filled protective device for the inner weld seam of a pipeline according to claim 1, characterized in that: Each set of connectors (1-4) includes a cylindrical connecting nut (1-4-1) and a cylindrical connecting screw (1-4-2), wherein the connecting nut (1-4-1) and the connecting screw (1-4-2) are threaded together, wherein the end of the connecting nut (1-4-1) away from the connecting screw (1-4-2) is inserted into the end of one of the adjacent pipes, and the end of the connecting screw (1-4-2) away from the connecting nut (1-4-1) is inserted into the end of another pipe.

3. The adjustable argon-filled protective device for the inner weld seam of a pipeline according to claim 1, characterized in that: The support assembly (2) includes a positioning end cap (2-1) and several support steel plates (2-2); the positioning end cap (2-1) is installed at the port of the pipe (4) and seals the end of the pipe (4); the several support steel plates (2-2) are radially installed inside the pipe (4); and the air intake assembly (1) is axially inserted into the positioning end cap (2-1) and the support steel plates (2-2).

4. The adjustable argon purging protection device for the inner weld of a pipeline according to claim 3, characterized in that: A positioning sleeve (2-3) is provided on the positioning end cap (2-1) and on each supporting steel plate (2-2), and the air intake assembly (1) is fixed by the positioning sleeve (2-3); The positioning sleeve (2-3) includes a sleeve (2-3-1) and two set screws (2-3-2). The sleeve (2-3-1) is fixedly connected to the positioning end cap (2-1) or the support steel plate (2-2). The two set screws (2-3-2) are radially screwed onto the sleeve (2-3-1) and tighten the air intake assembly (1).

5. An adjustable argon-filled protective device for the inner weld seam of a pipeline according to claim 1, characterized in that: The two sealing copper plates (6) are axially clamped and positioned by a positioning sleeve (2-3) and two positioning nuts (8). The positioning sleeve (2-3) is fitted on the air outlet pipe (1-3) and is located on the inner sealing copper plate (6). The two positioning nuts (8) are screwed to the end of the air outlet pipe (1-3) and are located on the outer sealing copper plate (6).

6. A method for argon purging protection of the inner weld seam of a pipeline, characterized in that: The adjustable argon purging protection device for the inner weld of a pipeline according to claim 5 has the following specific protection process: Step 1: Select a suitable connecting pipe (1-2) according to the docking length of the header pipe, and connect the air inlet pipe (1-1) and the air outlet pipe (1-3) by threaded connection and set them aside for use; Step 2: Place the sealing protective cover (3) on the exhaust port of the exhaust pipe (1-3), and adjust the opening position of the exhaust pipe (1-3) so that the opening position of the exhaust pipe (1-3) corresponds to the opening position of the inner ring (3-2) of the sealing protective cover (3). Step 3: Install a sealing copper plate (6) on the outside of the sealing protective cover (3) and lock it in place using a sealing washer (7) and two positioning nuts (8); install a sealing copper plate (6) on the inside of the sealing protective cover (3) and fix it in place using positioning sleeves (2-3); Step 4: Select appropriate positions on the air inlet pipe (1-1), connecting pipe (1-2), and air outlet pipe (1-3) respectively to install the support steel plate (2-2), and use the positioning sleeve (2-3) to lock and fix it. Step 5: Install the positioning end cap (2-1) to the end of the header pipe, lock and fix it with the positioning sleeve (2-3), and adjust the length of the air intake assembly (1) extending into the pipe so that the exhaust port of the sealing protective cover (3) is at the position where the pipe is to be filled with argon. Step 6: After connecting the inlet pipe (1-1) to the argon filling pipeline, open the argon filling pipeline and restart the argon gas protection inside the pipeline. When the argon gas concentration reaches the standard, perform the welding operation on the target pipeline.

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