Pipeline inner wall welding defect repairing device

Abstract

The utility model provides a pipeline inner wall welding defect repairing device which comprises a welding part, an observation part and a hoop, the welding part comprises a nozzle, a flow divider, a tungsten electrode clamp and a gas handle, the tungsten electrode clamp is used for clamping a tungsten electrode, the flow divider is arranged on the tungsten electrode clamp in a sleeving mode, one end of the flow divider is in threaded connection with the nozzle, and the other end of the flow divider is in threaded connection with the gas handle; the observation part comprises a probe, a coil pipe and a host, the probe is arranged on the peripheral side of the nozzle, and the probe is electrically connected with the host through the coil pipe; the clamp is arranged on the nozzle and the coil pipe in a sleeving mode and used for locking the nozzle and the part, close to the probe, of the coil pipe, and the probe can stretch into the pipeline along with the nozzle so that real-time observation can be conducted before, in and after pipeline inner wall welding defects are repaired. The welding part and the observation part can be locked by arranging the hoop, so that the nozzle can drive the probe to extend into the pipeline, the welding defect position is accurately found in the pipeline, the defect is directly remelted and repaired, a welding seam does not need to be cut from the outside, the purpose of repairing the defect is achieved, time and labor are saved, and the repairing cost can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of welding technology, and specifically relates to a device for repairing welding defects on the inner wall of a pipeline. Background Art

[0002] When welding stainless steel pipes, more than 95% of the defects are caused by the base weld, that is, the inner wall defects of the pipe. Especially when welding small-diameter thick-walled pipes, when the inner wall welding defects of the pipes occur, it is impossible to perform internal processing and use double-sided welding to repair the defects. The conventional repair method requires using an angle grinder to completely cut through the defective part from the outside until the root of the weld, remove all the defects, and then re-weld the part to achieve the purpose of repairing the defects. However, this method is time-consuming and labor-intensive, and the defect location cannot be accurately found.

[0003] Therefore, there is an urgent need for a pipeline inner wall welding defect repair device that can accurately find the welding defect location inside the pipeline and directly remelt and repair the defect without cutting the weld from the outside to achieve the purpose of repairing the defect. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present application is to provide a device for repairing welding defects on the inner wall of a pipeline, which can accurately find the location of the welding defect inside the pipeline and directly remelt and repair the defect without cutting the weld from the outside, thereby achieving the purpose of repairing the defect.

[0005] In order to solve the above problems, the present application provides a pipeline inner wall welding defect repair device, comprising:

[0006] A welding part, the welding part comprises a nozzle, a flow divider, a tungsten electrode clamp and a gas handle, the tungsten electrode clamp is used to clamp the tungsten electrode, the flow divider is sleeved on the tungsten electrode clamp, one end of the flow divider is screwed to the nozzle, and the other end is screwed to the gas handle;

[0007] An observation part, the observation part comprises a probe, a coil and a main unit, the probe is arranged on the outer peripheral side of the nozzle, and the probe is electrically connected to the main unit through the coil;

[0008] The clamp is sleeved on the nozzle and the coiled tube, and is used to lock the nozzle and the portion of the coiled tube close to the probe. The probe can follow the nozzle into the pipeline to perform real-time observation before, during and after the repair of welding defects on the inner wall of the pipeline.

[0009] Optionally, the probe is arranged at an angle to a central axis of the pipeline.

[0010] Optionally, the bending angle of the coiled tube can be fixed by changing its shape.

[0011] Optionally, the observation unit further includes:

[0012] A low-speed driving member, the low-speed driving member is arranged at an end of the coil away from the main machine; and

[0013] A rotating rod is connected to the output shaft of the low-speed driving member, and the probe is arranged on one end of the rotating rod away from the low-speed driving member.

[0014] Optionally, the probe includes a front-view lens and a side-view lens.

[0015] Optionally, a first fill light is arranged at one end of the rotating rod close to the front view lens, and a second fill light is arranged at one end of the rotating rod close to the side view lens.

[0016] Optionally, a battery is provided inside the host, a display screen and control buttons are provided on the surface of the host, and the front view lens, the side view lens, the first fill light, the second fill light, the display screen, the control buttons and the low-speed drive are electrically connected to the battery.

[0017] Optionally, the maximum outer diameter of the welding portion is A, and A≤5mm.

[0018] Optionally, the welding portion further includes a sealing ring, and the sealing ring is sleeved on one end of the diverter close to the gas handle.

[0019] Optionally, the welding part further comprises a control switch, and the control switch is arranged on an outer wall of the gas handle at an end away from the nozzle.

[0020] Beneficial Effects

[0021] The pipeline inner wall welding defect repair device provided in the embodiment of the utility model can lock the welding part and the observation part by setting a clamp, so that the nozzle can drive the probe to extend into the pipeline synchronously, and the position of the welding defect inside the pipeline can be determined before the defect is repaired, which is convenient for the repair of the welding part. Compared with cutting the weld from the outside of the pipeline to repair the welding defect, the pipeline inner wall welding defect repair device in this application can accurately find the welding defect position inside the pipeline and directly remelt and repair the defect. It is not only efficient, but also does not have the performance degradation and intergranular corrosion caused by repeated welding after pipeline cutting. It saves time and effort and can reduce the repair cost; at the same time, the observation part can also observe the defect repair process and the defect after the defect repair in real time, which can improve the defect repair effect and repair rate, thereby improving the yield rate of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a pipeline inner wall welding defect repairing device according to an embodiment of the present application;

[0023] Figure 2This is a schematic structural diagram of a welding portion of an embodiment of the present application;

[0024] Figure 3 for Figure 1 Enlarged structural diagram at A in the middle.

[0025] The reference numerals are:

[0026] 1. Welding part; 11. Nozzle; 12. Diverter; 13. Tungsten electrode; 14. Tungsten electrode clamp; 15. Gas handle; 17. Sealing ring; 16. Control switch; 2. Observation part; 21. Probe; 211. Front view lens; 212. Side view lens; 22. Coil; 23. Low-speed drive part; 24. Rotating rod; 25. First fill light; 26. Second fill light; 3. Clamp. DETAILED DESCRIPTION

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0030] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] See also Figures 1 to 3 As shown, according to an embodiment of the present application, a pipeline inner wall welding defect repair device is provided, including: a welding part 1, the welding part 1 includes a nozzle 11, a diverter 12, a tungsten electrode 13 clamp and a gas handle 15, the tungsten electrode 13 clamp is used to clamp the tungsten electrode 13, the diverter 12 is sleeved on the tungsten electrode 13 clamp, one end of the diverter 12 is screwed to the nozzle 11, and the other end is screwed to the gas handle 15; an observation part 2, the observation part 2 includes a probe 21, a coil 22 and a main unit, the probe 21 is arranged on the outer peripheral side of the nozzle 11, and the probe 21 is electrically connected to the main unit through the coil 22; a clamp 3, the clamp 3 is sleeved on the nozzle 11 and the coil 22, and is used to lock the nozzle 11 and the part of the coil 22 close to the probe 21, and the probe 21 can follow the nozzle 11 into the pipeline to perform real-time observation before, during and after the repair of the pipeline inner wall welding defect.

[0032] The pipeline inner wall welding defect repair device provided in the embodiment of the utility model can lock the welding part 1 and the observation part 2 by setting the clamp 3, so that the nozzle 11 can drive the probe 21 to extend into the pipeline synchronously, and the position of the welding defect inside the pipeline can be determined before the defect is repaired, which is convenient for the repair of the welding part 1. Compared with cutting the weld from the outside of the pipeline to repair the welding defect, the pipeline inner wall welding defect repair device in the present application can accurately find the welding defect position inside the pipeline and directly remelt and repair the defect. It is not only efficient, but also does not have the performance degradation and intergranular corrosion caused by repeated welding after the pipeline is cut, which saves time and labor and can reduce the repair cost; at the same time, the observation part 2 can also observe the defect repair process and the defect repair in real time, which can improve the defect repair effect and repair rate, thereby improving the yield rate of the pipeline.

[0033] Among them, the welding part 1 can be a TIG welding gun, a WP welding gun, a QS welding gun or a QQ welding gun, etc., which can be inserted into the pipeline to repair welding defects, and this application does not make further limitations.

[0034] Among them, in the embodiment of the present application, the welding part 1 is a straight-handled argon arc welding gun, and the welding part 1 can be extended into the pipeline along the axial direction of the pipeline. The welding defects are repaired by spot welding and remelting, and finally continue to be cooled by air cooling.

[0035] Specifically, the welding part 1 includes a nozzle 11, a diverter 12, a tungsten electrode 13 and a gas handle 15. The gas handle 15 is connected to the gas pipe, and the gas pipe is used to fill the gas handle 15 with argon or argon-rich gas; the diverter 12 is connected to the gas handle 15, and the diverter 12 is arranged on the side of the gas handle 15 away from the gas pipe. The diverter 12 is used to improve the uniformity of the flow of argon or argon-rich gas; the nozzle 11 is connected to the diverter 12, and the nozzle 11 is arranged on the side of the diverter 12 away from the gas handle 15. The nozzle 11 is used to guide the argon or argon-rich gas to make the argon gas during welding Or argon-rich gas is continuously ejected from the nozzle 11, forming a protective layer around the arc to isolate the air to prevent oxidation of the tungsten electrode 13, the molten pool and the adjacent heat-affected zone, thereby obtaining a high-quality weld; the tungsten electrode 13 clamp is arranged in the diverter 12, and the tungsten electrode 13 clamp is used to clamp the tungsten electrode 13. The end of the tungsten electrode 13 away from the gas handle 15 extends out of the diverter 12 to the nozzle 11. The tungsten electrode 13 arc is very stable and can still burn stably even under very low current conditions (<10A), so that the welding defect position can be remelted to achieve the purpose of repairing the welding defect.

[0036] The gas handle 15 is a holding position for the welding part 1 , that is, the worker can hold the gas handle 15 to control the welding part 1 .

[0037] The nozzle 11 is the gun head of the welding part 1 , and the nozzle 11 can be a porcelain nozzle.

[0038] The tungsten electrode 13 clamp may be an elastic clamp or the like, and it only needs to be able to clamp the tungsten electrode 13 , and this application does not make any further limitation.

[0039] Among them, the observation part 2 can be a rigid endoscope or a flexible endoscope, etc., which can be used to observe the internal situation of the pipeline. This application does not make further limitations. In the embodiment of this application, the observation part 2 is a flexible endoscope.

[0040] Specifically, the observation part 2 includes a probe 21, a coil 22 and a host. The probe 21 can be a visual detection device. For example, the probe 21 can be a high-definition camera, and the probe 21 is used to extend into the pipeline to observe the internal situation of the pipeline in real time; the host can be a human-computer interaction device. For example, the host can be a touch screen, and the host is used to receive the video signal transmitted by the probe 21, which is convenient for the staff to view; one end of the coil 22 is electrically connected to the probe 21, and the other end is electrically connected to the host. The coil 22 can be a flexible rod-shaped shell with a flexible optical fiber arranged inside. On the one hand, it can transmit the video signal of the probe 21 to the host, and on the other hand, it can transmit the control signal of the host to the probe 21.

[0041] It should be noted that the probe 21 has the function of magnifying defects so that the staff can clearly observe the location and nature of the defects.

[0042] The detection end of the observation part 2 is fixed to the welding part 1 through the clamp 3, so that when the welding part 1 is extended into the pipeline, the probe 21 can be driven to enter synchronously.

[0043] Specifically, when the detection end of the observation part 2 is fixed to the welding part 1 through the clamp 3, the probe 21 is located on the outer peripheral side of the nozzle 11, so that the probe 21 can accurately find the welding defect position inside the pipeline on the one hand, and observe the defect remelting during and after the defect repair process on the other hand.

[0044] Among them, the clamp 3 can be a stainless steel double steel wire clamp 3, a carbon steel double steel wire clamp 3, a phosphor bronze double steel wire clamp 3, a galvanized double steel wire clamp 3 or a nickel-plated double steel wire clamp 3, etc., and the present application does not make further limitations. In the embodiment of the present application, the clamp 3 is a stainless steel double steel wire clamp 3.

[0045] Specifically, in the embodiment of the present application, the clamp 3 is sleeved on the nozzle 11 and the coil 22 near the probe 21, so that the probe 21 can be fixed on the outer peripheral side of the nozzle 11, so that when the nozzle 11 is extended into the pipeline, the probe 21 can be driven to enter synchronously, thereby achieving the purpose of observing welding defects inside the pipeline.

[0046] In some possible implementations provided by the present disclosure, see Figure 1 As shown, the probe 21 is arranged at an angle to the central axis of the pipeline.

[0047] Among them, the probe 21 is set at an angle with the central axis of the pipeline, that is, the probe 21 is set at an angle with the axis of the welding part 1. It should be noted that in the embodiment of the present application, the welding part 1 extends into the pipeline along the axial direction of the pipeline to repair the position where the welding defect exists. When the probe 21 is set at an angle with the axis of the welding part 1, the probe 21 is tilted toward the direction close to the inner wall of the pipeline, which can more accurately determine the position of the welding defect inside the pipeline, making it easier for the staff to manipulate the welding part 1 to repair the defect.

[0048] In some possible embodiments provided by the present disclosure, the bending angle of the coiled tube 22 can be fixed by changing its shape.

[0049] The coiled tube 22 can be bent in any direction, which can ensure that the probe 21 can move flexibly in the internal space of the pipeline.

[0050] Specifically, the coiled tube 22 can fix the bending angle by changing its shape, which is convenient for accurately controlling the bending angle of the probe 21. The angle between the probe 21 and the central axis of the pipeline can be adjusted according to actual conditions, thereby increasing the application range of the pipeline inner wall welding defect repair device.

[0051] In some possible implementations provided by the present disclosure, see Figure 3As shown, the observation part 2 also includes: a low-speed driving member 23, which is arranged at the end of the coil 22 away from the main machine; and a rotating rod 24, which is connected to the output shaft of the low-speed driving member 23, and a probe 21 is arranged on the end of the rotating rod 24 away from the low-speed driving member 23.

[0052] The low-speed driving component 23 may be a low-speed motor or the like.

[0053] The rotating rod 24 may be a rotating shaft or the like.

[0054] Specifically, the probe 21 is set on the rotating rod 24, the rotating rod 24 is connected to the output shaft of the low-speed driving member 23, and the low-speed driving member 23 is connected to the end of the coil 22 away from the main machine. The low-speed driving member 23 is used to drive the rotating rod 24 to rotate and drive the probe 21 to rotate through the rotating rod 24, which can reduce the limitations of the observation angle of the probe 21.

[0055] It should be noted that the low-speed driving member 23 can rotate forward and reverse, and the rotation direction and rotation angle of the probe 21 can be adjusted according to needs.

[0056] By providing a low-speed drive member 23 and a rotating rod 24 at the connection between the probe 21 and the coil 22, so that the probe 21 has a rotation function, the limitation of the inspection angle of the observation part 2 inside the pipeline can be reduced, so that the location of the welding defects inside the pipeline can be accurately determined, making it easier for the staff to operate the welding part 1 to repair the defects.

[0057] In some possible implementations provided by the present disclosure, see Figure 3 As shown, the probe 21 includes a front-view lens 211 and a side-view lens 212 .

[0058] The probe 21 includes a front view lens 211 and a side view lens 212 , thereby making the observation screen wider.

[0059] Among them, the front view lens 211 and the side view lens 212 can both be high-definition cameras.

[0060] Specifically, a first accommodating hole is provided at one end of the rotating rod 24 away from the low-speed driving member 23, the first accommodating hole extends along the axial direction of the rotating rod 24, and a front view lens 211 is provided in the first accommodating hole; a second accommodating hole is provided on the outer wall of the rotating rod 24, the second accommodating hole extends along the radial direction of the rotating rod 24, and a side view lens 212 is provided in the second accommodating hole.

[0061] When the rotating rod 24 rotates, it can drive the front view lens 211 and the side view lens 212 to rotate at the same time.

[0062] It should be noted that before the welding defect is repaired, the front view lens 211 is used to quickly detect the welding defects on the inner wall of the pipeline, and the side view lens 212 is used to accurately determine the location of the welding defect; during the welding defect repair process, the rotating rod 24 is rotated to make the side view lens 212 face the nozzle 11, and the side view lens 212 can observe the remelting of the defect; after the welding defect is repaired, the side view lens 212 can be used to observe the surface repair of the weld directly facing the weld, and then the welding part 1 can be moved to observe the side repair of the weld through the front view lens 211, that is, observe the weld residual height.

[0063] The welding part 1 can be moved by the worker holding the gas handle 15.

[0064] In some possible implementations provided by the present disclosure, see Figure 3 As shown, a first fill light 25 is disposed at one end of the rotating rod 24 close to the front view lens 211 , and a second fill light 26 is disposed at one end of the rotating rod 24 close to the side view lens 212 .

[0065] By providing the first fill light 25 and the second fill light 26 , the brightness of the real-time image can be increased when the brightness inside the pipeline is insufficient, thereby ensuring the image clarity.

[0066] The first fill light 25 and the second fill light 26 may be LED lights.

[0067] Specifically, the first fill light 25 is arranged on the outer peripheral side of the front view lens 211. The first fill light 25 can be a light strip or a light sheet, etc. When the first fill light 25 is a light sheet, a plurality of first fill lights 25 are arranged, and the plurality of first fill lights 25 are evenly arranged along the circumferential direction of the front view lens 211; the second fill light 26 is arranged on one side of the side view lens 212 along the axial direction of the rotating rod 24.

[0068] In some possible embodiments provided by the present disclosure, a battery is provided inside the host, a display screen and control buttons are provided on the surface of the host, and the front view lens 211, the side view lens 212, the first fill light 25, the second fill light, the display screen, the control buttons and the low-speed drive component 23 are electrically connected to the battery.

[0069] The battery may be a secondary battery, ie a rechargeable battery.

[0070] Specifically, the battery is disposed inside the main unit and serves as an energy source for the operation of the observation unit 2 .

[0071] Among them, the display screen can be an OLED screen.

[0072] Specifically, a display screen is disposed on the surface of the host, and the display screen is electrically connected to the battery, the front view lens 211 and the side view lens 212 , and is used to display the observation image of the probe 21 .

[0073] Wherein, the control button can be made of insulating material.

[0074] Specifically, the control button is arranged on the surface of the main unit, and the control button is electrically connected to the battery, the first fill light 25, the second fill light 26 and the low-speed drive 23. By operating the control button, on the one hand, the first fill light 25 and the second fill light 26 can be turned on when the brightness inside the pipeline is insufficient, and on the other hand, the rotation direction and rotation angle of the output shaft of the low-speed drive 23 can be controlled.

[0075] In some possible embodiments provided by the present disclosure, the maximum outer diameter of the welding portion 1 is A, and A≤5 mm.

[0076] By setting the maximum outer diameter A of the welding part 1 to ≤5 mm, the welding part 1 can flexibly pass through the inside of the pipeline and can be adapted to the repair of welding defects of small-diameter thick-walled pipelines, thereby broadening the scope of application of the pipeline inner wall welding defect repair device.

[0077] The maximum outer diameter of the welding part 1 is the outer diameter of the nozzle 11 and the gas handle 15 .

[0078] Specifically, in the embodiment of the present application, the nozzle 11 and the gas handle 15 have the same outer diameter. For example, the outer diameters of the nozzle 11 and the gas handle 15 can be 5.0 mm, 4.9 mm, 4.8 mm, 4.7 mm, 4.6 mm, 4.5 mm, 4.4 mm, 4.3 mm, 4.2 mm, 4.1 mm or 4.0 mm, etc.

[0079] In some possible implementations provided by the present disclosure, see Figure 2 As shown, the welding portion 1 further includes a sealing ring 17 , and the sealing ring 17 is sleeved on one end of the diverter 12 close to the gas handle 15 .

[0080] Wherein, the sealing ring 17 can be a white rubber ring.

[0081] Specifically, in the embodiment of the present application, the end of the diverter 12 close to the gas handle 15 is an external threaded structure, the diverter 12 is threadedly connected to the gas handle 15, and the sealing ring 17 is sleeved on the end of the diverter 12 close to the gas handle 15, which can improve the sealing of the connection between the diverter 12 and the gas handle 15 and avoid leakage of argon or argon-rich gas, thereby improving the working stability of the welding part 1.

[0082] In some possible implementations provided by the present disclosure, see Figure 2 As shown, the welding part 1 further includes a control switch 16 , which is disposed on the outer wall of the gas handle 15 at one end away from the nozzle 11 .

[0083] By arranging a control switch 16 at one end of the gas handle 15 away from the nozzle 11, the worker can control the start and stop of the welding part 1 outside the pipeline, which is easy to control.

[0084] The control switch 16 may be a push switch, a button switch, a rocker switch, a micro switch, or the like.

[0085] Specifically, the control switch 16 is arranged on the outer wall of the gas handle 15 close to one end of the gas pipe, and the control switch 16 is used to control the arc starting and arc extinguishing of the power supply.

[0086] The working principle of the utility model is as follows: when the pipeline inner wall welding defect repairing device is in use, the observation part 2 is first started, and when the picture appears on the display screen of the host, the probe 21 is inserted into the pipeline to be detected. At this time, the display screen on the host displays the real-time picture of the front view lens 211 and the side view lens 212 dual lens detection, and then the low-speed driving part 23 is operated by the control button to drive the front view lens 211 and the side view lens 212 to rotate through the rotating rod 24, adjust the observation picture, use the defect magnification and rotation functions to confirm the position and nature of the welding defect, and then start the welding part 1 to remelt the defect position, so as to achieve the purpose of repairing the welding defect, and the welding defect repair is completed.

[0087] The pipeline inner wall welding defect repair device provided in the embodiment of the utility model can lock the welding part 1 and the observation part 2 by setting the clamp 3, so that the nozzle 11 can drive the probe 21 to extend into the pipeline synchronously, and the position of the welding defect inside the pipeline can be determined before the defect is repaired, which is convenient for the repair of the welding part 1. Compared with cutting the weld from the outside of the pipeline to repair the welding defect, the pipeline inner wall welding defect repair device in the present application can accurately find the welding defect position inside the pipeline and directly remelt and repair the defect. It is not only efficient, but also does not have the performance degradation and intergranular corrosion caused by repeated welding after the pipeline is cut, which saves time and labor and can reduce the repair cost; at the same time, the observation part 2 can also observe the defect repair process and the defect repair in real time, which can improve the defect repair effect and repair rate, thereby improving the yield rate of the pipeline.

[0088] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0089] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A pipeline inner wall welding defect repair device, characterized in that: include: A welding part (1), the welding part (1) comprising a nozzle (11), a flow divider (12), a tungsten electrode (13) clamp and a gas handle (15), the tungsten electrode (13) clamp is used to clamp the tungsten electrode (13), the flow divider (12) is sleeved on the tungsten electrode (13) clamp, one end of the flow divider (12) is screwed to the nozzle (11), and the other end is screwed to the gas handle (15); An observation section (2), the observation section (2) comprising a probe (21), a coil (22) and a main machine, the probe (21) being arranged on the outer peripheral side of the nozzle (11), and the probe (21) being electrically connected to the main machine through the coil (22); A clamp (3) is sleeved on the nozzle (11) and the coiled tube (22) and is used to lock the nozzle (11) and a portion of the coiled tube (22) close to the probe (21). The probe (21) can follow the nozzle (11) and extend into the pipeline to perform real-time observation before, during and after repair of welding defects on the inner wall of the pipeline.

2. The pipeline inner wall welding defect repairing device according to claim 1 is characterized in that: The probe (21) is arranged at an angle to the central axis of the pipeline.

3. The pipeline inner wall welding defect repairing device according to claim 1 is characterized in that: The coiled tube (22) can fix the bending angle by changing its shape.

4. The pipeline inner wall welding defect repairing device according to claim 1 is characterized in that: The observation section (2) further comprises: a low-speed driving member (23), the low-speed driving member (23) being arranged at an end of the coil (22) away from the main machine; and A rotating rod (24), the rotating rod (24) is connected to the output shaft of the low-speed driving member (23), and the probe (21) is arranged on one end of the rotating rod (24) away from the low-speed driving member (23).

5. The pipeline inner wall welding defect repairing device according to claim 4 is characterized in that: The probe (21) comprises a front-view lens (211) and a side-view lens (212).

6. The pipeline inner wall welding defect repairing device according to claim 5, characterized in that: A first fill light (25) is arranged at one end of the rotating rod (24) close to the front view lens (211), and a second fill light (26) is arranged at one end of the rotating rod (24) close to the side view lens (212).

7. The pipeline inner wall welding defect repairing device according to claim 6 is characterized in that: A battery is arranged inside the host, a display screen and control buttons are arranged on the surface of the host, and the front view lens (211), the side view lens (212), the first fill light (25), the second fill light, the display screen, the control buttons and the low-speed drive component (23) are electrically connected to the battery.

8. The pipeline inner wall welding defect repairing device according to claim 1, characterized in that: The maximum outer diameter of the welding portion (1) is A, and A≤5 mm.

9. The pipeline inner wall welding defect repairing device according to claim 1, characterized in that: The welding portion (1) further comprises a sealing ring (17), wherein the sealing ring (17) is sleeved on one end of the flow divider (12) close to the gas handle (15).

10. The pipeline inner wall welding defect repairing device according to claim 1, characterized in that: The welding part (1) further comprises a control switch (16), wherein the control switch (16) is arranged on the outer wall of the end of the gas handle (15) away from the nozzle (11).

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