Argon filling welding protection device for pipeline

Abstract

The utility model discloses a pipeline argon filling welding protection device which comprises two protection units. The protection unit comprises a ventilation pipe, a guide ring arranged at one end of the ventilation pipe and a positioning frame arranged at the other end of the ventilation pipe. An elastic sealing ring is arranged on the periphery of the guide ring; an annular groove is formed in the outer wall of the guide ring; the elastic sealing ring is connected in the annular groove in a sliding manner; the guide ring is provided with a first joint; three adjusting screws are arranged on the periphery of the positioning frame; and the adjusting screw is in threaded connection with the positioning frame. An argon protection cavity is formed in the position between the two welding pipes, operation is easy and convenient, and the welding quality and efficiency can be improved; the protection device is firmly fixed on the pipe wall by adjusting the screw, so that the protection device is prevented from loosening and displacing; and meanwhile, the guide ring provides guiding and supporting effects for the elastic sealing ring, the sealing effect between the elastic sealing ring and the pipe wall is improved, and the service life of the elastic sealing ring is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of argon arc welding technology, and in particular relates to a pipeline argon-filled welding protection device. Background Technology

[0002] Argon arc welding (argon arc welding) is widely used in industrial manufacturing for welding various industrial pipelines. Argon arc welding uses inert gas protection, resulting in a stable welding process and reducing the likelihood of impurities and oxidation. However, in the welding of stainless steel pipelines, due to the high affinity between stainless steel and oxygen, high temperatures can cause changes in the metallographic structure. If the argon purging inside the pipeline is inadequate, the weld metal on the back side is easily oxidized during welding, leading to welding defects and a decrease in the mechanical properties and corrosion resistance of the weld metal. Argon purging during stainless steel pipeline welding can stabilize the arc. The presence of argon gas inside the pipeline makes the arc more stable, reducing arc drift and flicker. Argon gas can also reduce the arc voltage and current, reducing energy consumption and welding costs. However, traditional argon purging methods often use simple methods such as sponges, cardboard, or adhesive tape to seal both ends of the pipe, resulting in unsatisfactory argon purging effects and high argon consumption.

[0003] Chinese patent document CN210878031U discloses an internal argon-filling protection device for argon arc welding, comprising a hollow support rod, one end of which is sealed and the other end connected to an argon gas source. Two air bladders are mounted on the support rod, with the cross-sectional area of ​​the air bladders being larger than the inner diameter of the steel pipe when inflated. An argon gas outlet is located between the two air bladders on the support rod. An umbrella-shaped bracket is mounted on the support rod, with a movable sleeve at the constricted end of the bracket. A spring is connected to the movable sleeve, and a fixing ring is located at the other end of the spring. The fixing ring is fixedly mounted on the support rod. The two inflated air bladders form a sealed space at the weld joint inside the steel pipe, reducing the amount of argon gas used, increasing the argon gas utilization rate, lowering construction costs, and achieving the goal of energy conservation and emission reduction.

[0004] In the aforementioned patented solution, the support rod is fixed within the steel pipe by the supporting force of the airbag and umbrella-shaped bracket against the pipe wall. The supporting force of the airbag originates from inflation. Due to its high flexibility and elasticity, the airbag is prone to sliding relative to the pipe wall, and the inflation pressure is often relatively low, only requiring the fulfillment of sealing conditions; therefore, the supporting force of the airbag is relatively small. The supporting force of the umbrella-shaped bracket comes from the spring force, which obviously cannot be too large, otherwise it would be difficult to manually drive the movable sleeve. Therefore, the aforementioned patented solution has poor fixing effect within the steel pipe and is easily loosened or displaced by external interference, such as accidental pulling of the inflation tube, or the slippage of the protective device due to gravity during longitudinal / oblique welding of the steel pipe. Utility Model Content

[0005] To overcome the technical problems of poor fixation of existing welding protection devices in welding pipes, which are easily loosened or displaced due to external interference (such as accidental pulling of the gas filling pipe or slippage caused by the weight of the protection device), this utility model aims to provide a pipeline argon-filled welding protection device. This device features a guide ring and an elastic sealing ring at one end of the gas filling pipe. The guide ring provides guidance and support for the elastic sealing ring, increasing its support strength against the pipe wall. Simultaneously, multiple threaded adjusting screws are provided at the other end. By rotating these screws, the device is firmly pressed against the pipe wall, achieving stable fixation and effectively resisting external interference to prevent loosening and displacement.

[0006] To achieve the above objectives, this utility model employs the following technical solution: a pipeline argon-filled welding protection device, comprising two protection units respectively located in two welding pipes; each protection unit includes a vent pipe, a guide ring disposed at one end of the outer wall of the vent pipe, and a positioning frame disposed at the other end of the outer wall of the vent pipe; the positioning frame is provided with at least three adjusting screws evenly distributed along the circumferential direction on its outer periphery; the adjusting screws are slidably connected to the positioning frame along the radial direction of the vent pipe; the adjusting screws are threadedly connected to the positioning frame; wherein, an elastic sealing ring is coaxially disposed on the outer periphery of the guide ring; an annular groove is coaxially disposed on the outer wall of the guide ring; the elastic sealing ring is radially sealed and slidably connected within the annular groove; a first connector communicating with the annular groove is provided at the end of the guide ring facing the positioning frame.

[0007] If the welding protection device is displaced, the electric arc generated by argon arc welding will come into contact with the elastic sealing ring, causing damage or leakage. It can also allow air to enter the welding position, reducing the welding quality.

[0008] Gas is introduced into the first connector to expand the elastic sealing ring until it abuts against the pipe wall. The guide ring provides guidance and support for the elastic sealing ring. The elastic sealing ring has lower requirements for elastic deformation capacity and flexibility, thereby enabling a greater abutment force between the elastic sealing ring and the pipe wall.

[0009] Furthermore, the radial cross-sectional shape of the elastic sealing ring is U-shaped; the opening of the U-shape faces the bottom of the annular groove; the two sides of the U-shaped opening are respectively provided with lips that are inclined away from the opening; the lips abut against the sidewall of the annular groove.

[0010] The lip abuts against the sidewall of the annular groove to achieve a two-way three-dimensional seal, resulting in a better sealing effect. The lip-shaped sliding seal design has a wide sealing stroke range and superior sealing performance, forming an all-round three-dimensional sealing structure. This optimizes the entire structural design and makes the argon filling protection process convenient, simple, and efficient.

[0011] Preferably, the end of the adjusting screw away from the positioning frame is provided with a pressing head.

[0012] The adjusting screw is located in the middle, which facilitates the insertion and rotation of the tool and prevents the tool from interfering with the pipe wall.

[0013] Furthermore, a constant pressure gas filling valve is provided on the first connector; argon gas is introduced into the annular groove at a constant pressure.

[0014] Specifically, the pressure of the argon gas introduced into the annular groove at a constant pressure is 0.1 MPa.

[0015] Furthermore, a sealing plug is detachably connected to one end of the vent pipe near the positioning frame; a second connector is detachably connected to one end of the vent pipe near the positioning frame; the vent pipe may be optionally fitted with either the sealing plug or the second connector.

[0016] Specifically, the second connector is detachably connected to a quick-release connector; the quick-release connector is equipped with an adjusting valve.

[0017] Specifically, the regulating valve controls the argon flow rate to be greater than or equal to 1 liter and less than or equal to 2 liters per minute.

[0018] Specifically, the two guide rings are located close to each other; one of the two regulating valves is used to introduce argon gas, and the other is used to discharge argon gas.

[0019] Furthermore, the sealing ring is made of silicone rubber, which utilizes its softness, elasticity, smooth surface, anti-aging, corrosion resistance, and good sealing effect to ensure that the argon gas protection circuit inside the welded steel pipe does not leak.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. This utility model can form an argon gas protective cavity between two welding pipes that need to be welded, thereby improving the welding effect of argon arc welding; and it is simple, convenient, fast, flexible, simple and efficient to operate, which helps to improve the quality and efficiency of welding and ensure the strength and aesthetics of the welded joint.

[0022] 2. This utility model uses adjusting screws to firmly fix the protective device to the pipe wall, effectively resisting interference from external factors and preventing the protective device from loosening or shifting; at the same time, a guide ring is set to provide guidance and support for the elastic sealing ring, which reduces the requirements for the elasticity and flexibility of the elastic sealing ring and allows for higher structural strength of the elastic sealing ring, which helps to improve the sealing effect between the elastic sealing ring and the pipe wall, as well as its service life. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of a single protection unit of this utility model.

[0025] In the diagram: 1. Welded pipe; 2. Vent pipe; 3. Guide ring; 31. Annular groove; 32. First connector; 4. Elastic sealing ring; 41. Lip; 5. Positioning bracket; 6. Adjusting screw; 61. Press head; 7. Second connector; 8. Quick-release connector; 91. Adjusting valve; 92. Constant pressure inflation valve. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, terms such as "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] See Figures 1-2A pipeline argon-filled welding protection device includes two protection units located in two welding pipes 1 respectively; each protection unit includes a vent pipe 2, a guide ring 3 disposed at one end of the outer wall of the vent pipe 2, and a positioning frame 5 disposed at the other end of the outer wall of the vent pipe 2; the two protection units are respectively disposed inside the two welding pipes 1 to be welded, and the weld seam is located between the two guide rings 3.

[0031] The guide ring 3 is coaxially provided with a silicone elastic sealing ring 4; the guide ring 3 is coaxially provided with an annular groove 31 on its outer wall; the elastic sealing ring 4 is radially sealed and slidably connected in the annular groove 31; the guide ring 3 is provided with a first connector 32 communicating with the bottom of the annular groove 31 at one end facing the positioning frame 5; the radial cross-sectional shape of the elastic sealing ring 4 is U-shaped; the opening of the U-shape faces the bottom of the annular groove 31; the two sides of the U-shaped opening are respectively provided with lips 41 that are inclined away from the opening; the lips 41 abut against the side wall of the annular groove 31.

[0032] The positioning frame 5 is provided with three adjusting screws 6 evenly distributed along the circumference; the adjusting screws 6 are slidably connected to the positioning frame 5 along the vent pipe 2 in the radial direction; the adjusting screws 6 are threadedly connected to the positioning frame 5; a pressure head 61 is provided at the end of the adjusting screw 6 away from the positioning frame 5.

[0033] The first connector 32 is provided with a constant pressure inflation valve 92; the constant pressure inflation valve 92 is located outside the welded pipe 1; the constant pressure inflation valve 92 is connected to the first connector 32 through an inflation hose; argon gas is introduced into the annular groove 31 at a constant pressure of 0.1 MPa.

[0034] A sealing plug is detachably connected to one end of the vent pipe 2 near the positioning frame 5; a second connector 7 is detachably connected to one end of the vent pipe 2 near the positioning frame 5; the vent pipe 2 may be optionally fitted with either the sealing plug or the second connector 7.

[0035] The second connector 7 is detachably connected to a quick-release connector 8; the quick-release connector 8 is equipped with a regulating valve 91. Of the two regulating valves 91 in the two protection units, one is used to introduce argon gas, and the other is used to discharge argon gas. The regulating valve 91 controls the argon flow rate to be greater than or equal to 1 liter and less than or equal to 2 liters per minute.

[0036] Usage: Before welding, turn the three adjusting screws 6 of each protection unit clockwise at equal intervals. When the imaginary arc size of the concentric circles formed by the three adjusting screws 6 is smaller than the inner diameter of the welding pipe 1, the protection device can be smoothly inserted. Before insertion, reliably connect the inflation hose of the constant pressure inflation valve 92 to the first connector 32. Then, manually compress the elastic sealing ring 4 inwards to prevent the sealing end of the protection device from contacting the inner wall of the welding pipe 1, thus preventing friction during repeated use and avoiding long-term accumulated friction that could affect the service life of the elastic sealing ring 4 (silicone rubber).

[0037] After completing the preliminary preparations, the protective device can be assembled. First, slowly insert the end of the protective device with the elastic sealing ring 4 into the welding pipe 1, with the inflation hose following the protective device into the welding pipe 1 simultaneously. When the center of the adjusting screw 6 is 35mm from the outer end of the welding pipe 1, the argon-filled welding protective device stops extending. Then, use a wrench to turn the three adjusting screws 6 counterclockwise, keeping the three screws in a concentric circle as much as possible. When the support position of the three adjusting screws 6 contacts the inner wall of the welding pipe 1, use a steel ruler to check if the argon-filled connecting pipe is in the center position. If there is a dimensional deviation, fine-tune the extension length of the adjusting screws 6. After adjusting to the center position, tighten the three adjusting screws 6 and fix the protective device in place.

[0038] After positioning the protection device, slowly open the constant pressure inflation valve 92 to inflate the annular groove 31. Under the pressure, the elastic sealing ring 4 slowly extends to the inner surface of the welded pipe 1. As the pressure further increases, the lip 41 tightly adheres to the inner wall of the annular groove 31, and the outer circumference of the elastic sealing ring 4 tightly adheres to the inner wall of the welded pipe 1, forming a two-way three-dimensional sealing surface to ensure that the inflated gas does not leak. When the inflation pressure rises to the same level as the pressure of the circulating inflation system, the system stops increasing the pressure, and the two maintain pressure balance. The constant gauge pressure of the inflated gas should be maintained at 0.1 MPa. This indicates that the automatic constant pressure circulating inflation system has good sealing performance, and the regulating valve 91 can be opened to inflate the welded pipe 1 with argon to achieve argon-filled protection for welding. If the constant gauge pressure of the inflated gas cannot be maintained at 0.1 MPa, it indicates that there is a leak in the automatic constant pressure circulating inflation system. The elastic sealing ring 41 and the inner surface of the welded pipe 1 should be checked for cleanliness, and the cause of the leak should be identified before the regulating valve 91 can be opened.

[0039] Argon gas should be purged before welding with an appropriately increased flow rate. After the air is expelled, the flow rate should be gradually reduced. Argon should be continuously purged into the welding tube 1 during welding, and the gas supply should be stopped with a delay when welding stops to ensure adequate protection of the weld. It is particularly important that welding can only begin after all air has been expelled. The argon inlet should be placed as low as possible in the closed section, while the air outlet should be placed at a higher position within the closed section. Because argon is heavier than air, purging from a lower position ensures a higher concentration and better argon protection. Otherwise, the protective effect of the argon purging will be compromised. The argon flow rate should be appropriately controlled. Too low a flow rate will result in poor protection and easy oxidation on the back of the weld; too high a flow rate will create eddies that introduce air during welding, leading to suboptimal protection and defects such as root concavity, affecting weld quality. To reduce argon loss from the weld joint gap, which affects protection and increases costs, masking tape can be applied along the weld joint gap before welding, leaving only the length for the welder to begin arc striking.

[0040] The argon purging time should be determined based on the size and shape of the pipe opening. Generally, the larger the pipe diameter, the longer the purging time. For thin-walled, small-diameter pipe openings, the purging time should be controlled between 30 seconds and 1 minute. For thick-walled, large-diameter pipe openings, the purging time should be appropriately extended. The argon flow rate should be moderate to avoid the formation of turbulence inside the pipe opening. Generally, the argon flow rate should be controlled between 1 and 2 liters per minute. This pressure range ensures that argon acts as a protective gas, effectively preventing harmful substances such as oxygen and water vapor from reacting with the heat source, thereby avoiding oxidation, corrosion, and other problems that may occur during welding. The effectiveness of argon purging protection can be judged by observing the color of the weld. During welding, the welder can adjust the regulating valve 91, i.e., the flow rate of the protective gas, according to the color to achieve a better protective effect on the weld. A qualified weld is best when it is silver-white or golden-yellow, good when it is blue, and good when it is reddish-gray, indicating that the weld texture is uniform and free from defects such as porosity and slag inclusions. If the weld is dark or grayish-black, it indicates that the argon purging protection effect is poor, and the purging parameters need to be adjusted.

[0041] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A tube argon-filled welding protection device, characterized by: The device includes two protective units located in two welding pipes respectively. Each protective unit includes a vent pipe, a guide ring disposed at one end of the outer wall of the vent pipe, and a positioning frame disposed at the other end of the outer wall of the vent pipe. At least three adjusting screws are evenly distributed circumferentially on the outer periphery of the positioning frame. The adjusting screws are radially slidably connected to the positioning frame along the vent pipe and are threadedly connected to the positioning frame. An elastic sealing ring is coaxially disposed on the outer periphery of the guide ring. An annular groove is coaxially disposed on the outer wall of the guide ring. The elastic sealing ring is radially slidably connected to the annular groove. A first connector communicating with the annular groove is disposed at the end of the guide ring facing the positioning frame.

2. The protection device of claim 1, wherein: The radial cross-sectional shape of the elastic sealing ring is U-shaped; the opening of the U-shape faces the bottom of the annular groove; the two sides of the U-shaped opening are respectively provided with lips that are inclined away from the opening; the lips abut against the sidewall of the annular groove.

3. Protection according to any of claims 1-2, characterized in that: A pressure head is provided at the end of the adjusting screw away from the positioning frame.

4. Protection according to any of claims 1-2, characterized in that: The first connector is equipped with a constant pressure gas filling valve; argon gas is introduced into the annular groove at a constant pressure.

5. The protection device of claim 4, wherein: The pressure of argon gas introduced into the annular groove is 0.1 MPa.

6. The protection device of any one of claims 1-2, wherein: A sealing plug is detachably connected to one end of the vent pipe near the positioning frame; a second connector is detachably connected to the other end of the vent pipe near the positioning frame; the vent pipe may be optionally fitted with either the sealing plug or the second connector.

7. The protection device of claim 6, wherein: The second connector is detachably connected to a quick-release connector; the quick-release connector is equipped with an adjusting valve.

8. The protection device of claim 7, wherein: The regulating valve controls the argon flow rate to be greater than or equal to 1 liter and less than or equal to 2 liters per minute.

9. The protection device of claim 7, wherein: The two guide rings are located close to each other; one of the two regulating valves is used to introduce argon gas, and the other is used to discharge argon gas.

10. The protection device of any one of claims 1-2, wherein: The sealing ring is made of silicone rubber.

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