Gas conveying mechanism and surfacing welding device

Abstract

The utility model relates to the field of welding manufacturing, and discloses a gas conveying mechanism and a surfacing device, the gas conveying mechanism comprises a main gas pipe and more than two gas dispersing pipes, the main gas pipe is provided with a main gas cavity, one end of the main gas pipe is provided with a gas inlet communicated with the main gas cavity, and the gas inlet is suitable for being communicated with a gas conveying pipe; the air dispersing pipes are provided with air dispersing cavities, the air dispersing cavities are communicated with the end, away from the air inlet, of the main air pipe, a plurality of air dispersing holes are formed in the air dispersing pipes, and all the air dispersing pipes form an arc-shaped air dispersing area which is arranged away from the main air pipe. In the application, the gas dispersing pipe uniformly disperses the gas to the arc-shaped gas dispersing area through the gas dispersing holes of the gas dispersing pipe, a gas protection environment surrounding the workpiece is formed, the gas can be fully attached to the circumferential surface of the tubular workpiece, the gas uniformly covers the surfacing area, meanwhile, the interior of the workpiece is cooled, the interlayer temperature in the welding stage is reduced, and the exterior is protected; the thin-wall workpiece surface oxidation is avoided; cooling and protection are achieved through the same mechanism, and the efficiency of welding operation is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of welding manufacturing, concretely relates to a gas conveying mechanism and surfacing device. BACKGROUND

[0002] In valve manufacturing industry, pipeline manufacturing industry and pressure vessel industry, part of tubular workpieces need to be surfacing with corrosion-resistant alloy or hard alloy in the inside for the consideration of design running medium and working condition, so as to ensure the use condition of the product. From the welding process point of view, the temperature between layers needs to be controlled in the surfacing process to ensure the crack resistance of the surfacing weld. From the workpiece integrity point of view, the temperature of the workpiece is too high in the surfacing process due to the effect of welding arc heat, which will lead to deformation, and the roundness and concentricity cannot meet the requirements. Therefore, the temperature of the workpiece needs to be controlled in the surfacing process. The conventional method is to interrupt the welding process once or multiple times, that is, to stop the arc in the surfacing process, interrupt the welding, and wait for the workpiece to cool down to room temperature or the lowest preheating temperature before starting welding again. Although this method can reduce the temperature of the workpiece, it will also lead to the decrease of production efficiency and the waste of worker's time, and also reduce the utilization rate of equipment. Another situation is that the thickness of the surfacing tubular workpiece is too thin, such as the pipe wall thickness T≤8mm. In the surfacing process, the outside of the workpiece will appear red-hot state when the inside of the workpiece is surfacing. If the surfacing workpiece is made of austenitic stainless steel or nickel-based alloy, the welding process needs to track the surfacing area outside the workpiece for protection. The conventional method is to use a manual protective gas shield to protect the outside area of the surfacing area of the workpiece. This method needs other personnel to operate in addition to the welder, which causes the waste of human cost.

[0003] Therefore, a gas conveying mechanism is needed, which can reduce the temperature of the surfacing workpiece area and protect the thin-walled workpiece. SUMMARY

[0004] Therefore, the utility model provides a gas conveying mechanism and surfacing device to solve the technical problems in the background art.

[0005] In the first aspect, the utility model provides a gas conveying mechanism, which comprises:

[0006] A main gas pipe has a main gas cavity. One end of the main gas pipe is provided with a gas inlet communicating with the main gas cavity. The gas inlet is adapted to communicate with a gas conveying pipe.

[0007] At least two gas diffusing pipes have gas diffusing cavities. The gas diffusing cavities are arranged in communication with one end of the main gas pipe away from the gas inlet. A plurality of gas diffusing holes are arranged on the gas diffusing pipes. All the gas diffusing pipes form an arc-shaped gas diffusing area, which is arranged away from the main gas pipe.

[0008] Beneficial effects: The main gas pipe serves as the main gas delivery channel to introduce gas from the gas delivery pipe; the gas distribution pipe uniformly distributes the gas to the arc-shaped gas distribution area through its gas distribution holes, forming a gas protection environment around the workpiece; through the design of this arc-shaped gas distribution area, the circumferential surface of the tubular workpiece is fully matched, achieving uniform gas coverage of the surfacing area, cooling the inside of the workpiece, reducing the interlayer temperature during welding, protecting the outside, and avoiding oxidation of the surface of the thin-walled workpiece; through the same mechanism, cooling and protection are achieved, avoiding the need to interrupt welding or manual operation in traditional methods, improving the efficiency of welding operations, and through continuous and uniform heat dissipation, avoiding deviations in roundness and concentricity caused by local overheating of the workpiece, reducing the risk of deformation of the surfacing workpiece.

[0009] In some optional embodiments, the gas delivery mechanism further comprises a secondary gas pipe assembly, which is communicatively arranged between the main gas pipe and the gas distribution pipe to communicate the main gas pipe and the gas distribution pipe.

[0010] Beneficial effects: The secondary gas pipe assembly serves as an intermediate transition and further distributes gas, enabling the gas to flow more uniformly from the main gas pipe to the gas distribution pipe, further improving the gas protection and cooling effect, making the workpiece more evenly heated during surfacing, reducing defects caused by excessive or insufficient local temperature, and improving the surfacing quality and performance of the workpiece. In addition, the secondary gas pipe assembly can be adapted to different numbers / angles of gas distribution pipes to flexibly cope with different sizes of workpieces, enhancing the adaptability of the mechanism.

[0011] In some optional embodiments, the secondary gas pipe assembly comprises a first pipe body having a first cavity, the first pipe body is provided with a first communication hole in communication with the first cavity, the first communication hole is in communication with one end of the main gas pipe away from the gas inlet, and the first pipe body is further provided with a second communication hole in communication with the first cavity, the first cavity is in communication with the gas distribution cavity through the second communication hole, and the second communication hole is correspondingly arranged with the gas distribution cavity.

[0012] Beneficial effects: The first pipe body, as the core component of the secondary gas pipe assembly, connects the main gas pipe and the gas distribution pipe through the first communication hole and the second communication hole, achieving smooth transmission and distribution of gas; the first cavity serves as a temporary gas storage space to buffer the high-speed gas flow input by the main gas cavity, enabling the gas to enter the gas distribution pipe smoothly, reducing pressure fluctuations caused by turbulence, and the second communication hole is correspondingly arranged with the gas distribution cavity to ensure that the gas directly enters the target area, reducing energy loss.

[0013] In some optional embodiments, the secondary gas pipe assembly further comprises a second pipe body and a third pipe body, the second pipe body and the third pipe body are symmetrically arranged on both sides of the first pipe body.

[0014] Beneficial effects: The second and third tubes are symmetrically arranged on both sides of the first tube. The second and third tubes can serve as a support and connection. The symmetrical design enhances the mechanical strength of the components, prevents vibration or thermal stress deformation, and improves the stability of the mechanism during operation.

[0015] In some alternative embodiments, the first pipe body is welded to the main air pipe and all the air distribution pipes, and the second pipe body and the third pipe body are respectively welded to the air distribution pipes on one side of the first pipe body.

[0016] Beneficial effects: By fixing the various components together through welding, the structural robustness and sealing of the entire gas conveying mechanism are ensured. Welded connections offer high strength and excellent sealing performance, effectively preventing gas leakage and guaranteeing the stability and reliability of the gas during delivery. This connection method makes the entire gas conveying mechanism less prone to loosening or damage during long-term use, improving equipment stability and service life, while also reducing maintenance costs and increasing production efficiency.

[0017] In some alternative embodiments, six air diffusers are provided, all of which are symmetrically arranged on both sides of the first tube body.

[0018] Beneficial effects: The six air vents can form a large arc-shaped coverage, which is suitable for pipes of different diameters and ensures the desired cooling and protection functions; the symmetrical design is conducive to full heat exchange, promotes uniform heat distribution on the welded workpiece, and avoids defects such as deformation and cracks caused by local overheating.

[0019] In some optional embodiments, the projections of all the vent holes on the same root onto the vertical height plane are equally spaced, and the distance between the projections of any two adjacent vent holes onto the vertical height plane is set to 25mm; the structure of the vent holes is set as circular holes, and the radius of the vent holes is set to 1.5mm.

[0020] Beneficial effects: Equally spaced vent holes allow for more uniform gas ejection, forming a stable gas protective layer. This optimizes the protection and cooling effects of the gas, resulting in more uniform heating of the workpiece during welding and reducing defects caused by excessively high or low local temperatures. The circular hole structure of the vent holes provides excellent gas ejection, ensuring gas flow and distribution. Reasonable vent hole spacing and size also improve gas utilization, reduce gas consumption, lower production costs, and increase production efficiency.

[0021] In some alternative embodiments, the gas delivery mechanism further includes an adjusting member detachably connected to the main gas pipe, the adjusting member having an adjusting sleeve adapted to engage with a fixed bracket extending in the height direction.

[0022] Beneficial effects: The adjusting component is used to adjust the height of the gas delivery mechanism in conjunction with the fixed bracket of the external device, so that the mechanism can better adapt to the welding requirements of different workpieces, ensure that the gas can be accurately sprayed onto the welding area of ​​the workpiece, and guarantee the effect of gas protection and cooling.

[0023] Secondly, this utility model also provides a welding device, including the gas conveying mechanism described above.

[0024] Beneficial effects: Applying a gas delivery mechanism to a welding apparatus provides gas protection and cooling for the welding process, effectively solving the problems of workpiece temperature control and thin-walled workpiece protection in related technologies, thereby improving welding quality and production efficiency. Through the gas protection and cooling effect of the gas delivery mechanism, the workpiece temperature can be reduced, preventing workpiece deformation, while protecting the external area of ​​thin-walled workpieces from damage during welding, improving workpiece integrity and performance, and reducing production costs.

[0025] In some optional embodiments, the welding device further includes a turntable base, a turntable disk, and a fixed bracket. The turntable disk is rotatably disposed above the turntable base, and the fixed bracket is fixedly connected to the turntable base. The fixed bracket and the turntable disk are spaced apart and avoid each other.

[0026] Beneficial effects: The turntable base and turntable plate support and fix the workpiece for welding, allowing the workpiece to rotate during the welding process, facilitating welding operations on various parts of the workpiece. The fixed bracket is used to install and fix the gas delivery mechanism, enabling the mechanism to stably provide gas protection and cooling to the workpiece. This configuration allows the welding device to achieve automated rotary welding of the workpiece, improving welding efficiency and the uniformity of quality. Simultaneously, the spacing and clearance between the fixed bracket and the turntable plate ensures a reasonable distance between the mechanism and the workpiece, ensuring that the gas can be effectively sprayed onto the workpiece surface. The overall structure of the welding device is compact. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the gas conveying mechanism according to an embodiment of the present utility model;

[0029] Figure 2 This is a structural diagram of the gas conveying mechanism according to an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the auxiliary gas pipe assembly and the gas distribution pipe in the gas delivery mechanism of this utility model embodiment;

[0031] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0032] Figure 5 This is a schematic diagram of the gas conveying mechanism in cooling function operation according to an embodiment of the present invention;

[0033] Figure 6 This is a structural diagram of the gas conveying mechanism in the cooling function operation according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the gas delivery mechanism in protective operation according to an embodiment of the present invention;

[0035] Figure 8 This is a structural diagram of the gas delivery mechanism in the protective function operation according to an embodiment of the present utility model;

[0036] Explanation of reference numerals in the attached figures:

[0037] 101. Main air pipe; 1011. Air inlet; 102. Air diffuser pipe; 1021. Air diffuser hole; 103. Secondary air pipe assembly; 1031. First pipe body; 1032. Second pipe body; 1033. Third pipe body; 104. Adjustment component;

[0038] 102, 201, Turntable base; 202, Turntable plate; 203, Fixed bracket; 204, Welding torch;

[0039] 103, 301, weld overlay workpiece; 302, weld overlay layer. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0042] According to an embodiment of the present invention, a gas conveying mechanism is provided, see [link to embodiment]. Figures 1 to 4The gas delivery mechanism includes a main gas pipe 101 and two or more gas distribution pipes 102. The main gas pipe 101 has a main gas chamber, and one end of the main gas pipe 101 is provided with an air inlet 1011 that communicates with the main gas chamber. The air inlet 1011 is adapted to communicate with the gas delivery pipe. The gas distribution pipe 102 has a gas distribution chamber, which is connected to the end of the main gas pipe 101 away from the air inlet 1011. The gas distribution pipe 102 is provided with a plurality of gas distribution holes 1021. All gas distribution pipes 102 form an arc-shaped gas distribution area, which is located away from the main gas pipe 101.

[0043] The gas delivery mechanism provided in this embodiment uses a main gas pipe 101 as the main gas delivery channel to introduce gas from the gas delivery pipe. The gas distribution pipe 102 disperses the gas evenly into the arc-shaped gas distribution area through its gas distribution holes 1021, forming a gas protective environment surrounding the workpiece. This arc-shaped gas distribution area design fully conforms to the circumferential surface of the tubular workpiece, achieving uniform gas coverage of the welding area, while cooling the inside of the workpiece, reducing the interlayer temperature during the welding stage, protecting the outside, and preventing oxidation of the thin-walled workpiece surface. Cooling and protection are achieved through the same mechanism, avoiding the problem of interrupting welding or manual operation in traditional methods, improving the efficiency of welding operations, and through continuous and uniform heat dissipation, avoiding deviations in roundness and concentricity of the workpiece due to local overheating, reducing the risk of deformation of the welded workpiece 301.

[0044] In one embodiment, see Figure 1 and Figure 2 The gas delivery mechanism also includes a secondary gas pipe assembly 103, which is connected between the main gas pipe 101 and the diffuser pipe 102 to connect the main gas pipe 101 and the diffuser pipe 102. The secondary gas pipe assembly 103 serves as an intermediate transition and further distributes the gas, allowing the gas to flow more evenly from the main gas pipe 101 to the diffuser pipe 102, further improving the gas protection and cooling effect, making the workpiece heat-treated more evenly during the welding process, reducing defects caused by excessively high or low local temperatures, and improving the welding quality and the performance of the workpiece.

[0045] In one embodiment, see Figure 3The auxiliary air duct assembly 103 includes a first tube body 1031, which has a first cavity. The first tube body 1031 has a first connecting hole communicating with the first cavity. The first connecting hole is connected to the end of the main air duct 101 furthest from the air inlet 1011. The first tube body 1031 also has a second connecting hole communicating with the first cavity. The first cavity is connected to a gas dispersion chamber via the second connecting hole, which is correspondingly positioned to the gas dispersion chamber. The first tube body 1031, as the core component of the auxiliary air duct assembly 103, specifically connects the main air duct 101 and the gas dispersion chamber 102 through the first and second connecting holes, enabling smooth gas transmission and distribution. The first cavity serves as a temporary gas storage space, buffering the high-speed airflow input from the main air cavity, allowing the gas to smoothly enter the gas dispersion chamber 102 and reducing pressure fluctuations caused by turbulence. The second connecting hole, corresponding to the gas dispersion chamber, ensures that the gas directly enters the target area, reducing energy loss.

[0046] In one embodiment, see Figure 3 The auxiliary air pipe assembly 103 also includes a second pipe body 1032 and a third pipe body 1033, which are symmetrically arranged on both sides of the first pipe body 1031. The symmetrical arrangement of the second pipe body 1032 and the third pipe body 1033 on both sides of the first pipe body 1031 serves as a supporting connection. The symmetrical design enhances the mechanical strength of the assembly, prevents vibration or thermal stress deformation, and improves the stability of the mechanism during operation.

[0047] In one embodiment, the second pipe body 1032 and the third pipe body 1033 are connected to the vent pipe 102, and the second pipe body 1032 and the third pipe body 1033 serve to circulate gas. For example, four vent pipes 102 are provided: two vent pipes 102 are located on one side of the first pipe body 1031, and the two ends of the second pipe body 1032 are connected to the two vent pipes 102 on that side; the other two vent pipes 102 are located on the other side of the first pipe body 1031, and the two ends of the third pipe body 1033 are connected to the two vent pipes 102 on that side. This design facilitates gas diversion, allowing flow between the vent pipes 102 on the first pipe body 1031 side, promoting consistent gas flow in the vent pipes 102, and ensuring reliable cooling and protection.

[0048] In one embodiment, see Figure 3 There are six vent pipes 102, all of which are symmetrically arranged on both sides of the first pipe body 1031. This design allows the six vent pipes 102 to form a large-area arc-shaped coverage, which is suitable for pipes of different diameters and ensures the desired cooling and protection functions. The symmetrical design is conducive to sufficient heat exchange, promotes the uniform distribution of heat on the weld overlay workpiece 301, and avoids defects such as deformation and cracks caused by local overheating.

[0049] The gas delivery mechanism provided in this embodiment has an auxiliary gas pipe assembly 103 that can be adapted to different numbers / angles of gas distribution pipes 102 to flexibly handle workpieces of different sizes and enhance the adaptability of the mechanism.

[0050] In one embodiment, the first pipe body 1031 is welded to the main gas pipe 101 and all the gas distribution pipes 102, and the second pipe body 1032 and the third pipe body 1033 are respectively welded to the corresponding gas distribution pipes 102 on one side of the first pipe body 1031. Welding securely connects the components, ensuring the structural robustness and sealing of the entire gas delivery mechanism. The welded connection has high strength and excellent sealing performance, effectively preventing gas leakage and ensuring the stability and reliability of the gas during delivery. This connection method makes the entire gas delivery mechanism less prone to loosening or damage during long-term use, improving the stability and service life of the equipment, while also reducing maintenance costs and increasing production efficiency.

[0051] In one embodiment, the projections of all vent holes 1021 on the same shaft onto the vertical height plane are equally spaced, and the distance between the projections of any two adjacent vent holes 1021 on the vertical height plane is set to 25mm. The equally spaced vent holes 1021 allow for more uniform gas ejection, forming a stable gas protective layer. This optimizes the gas protection and cooling effect, ensuring more uniform heating of the workpiece during welding and reducing defects caused by excessively high or low local temperatures. The vent holes 1021 are circular holes with a radius of 1.5mm. This hole structure provides excellent gas ejection, ensuring gas flow and distribution. Reasonable spacing and size of the vent holes 1021 also improve gas utilization, reduce gas consumption, lower production costs, and increase production efficiency.

[0052] In one embodiment, see Figure 5 and Figure 7 The gas delivery mechanism also includes an adjusting component 104, which is detachably connected to the main gas pipe 101. The adjusting component 104 has an adjusting sleeve adapted to engage with a fixed bracket 203 extending along the height direction. The adjusting component 104 is used to adjust the height of the gas delivery mechanism in conjunction with the fixed bracket 203 of the external device, so that the mechanism can better adapt to the welding requirements of different workpieces, ensure that the gas can be accurately sprayed onto the welding area of ​​the workpiece, and guarantee the effect of gas protection and cooling.

[0053] The gas delivery mechanism provided in this embodiment requires that the arc-shaped gas dissipation area formed by the mechanism has a certain degree of overlap and envelopment with the shape of the workpiece 301 to be welded, and the use of the mechanism will not affect the normal welding operation of the workpiece 301.

[0054] Among them, the workpiece 301 for overlay welding is a tubular workpiece, and the overlay welding of its inner wall adopts a vertical overlay welding method. The design, installation and use of the mechanism are conformally matched with the tubular workpiece.

[0055] In the specific implementation process, an austenitic stainless steel hollow pipe with a length L = 700 mm, an outer diameter Φ 20 mm, and a wall thickness δ = 2 mm can be used as the main air pipe 101. At the same time, the main air pipe 101 also serves as a longitudinal support rod. Steps are machined at both ends on one side of the main air pipe 101 to serve as air inlets 1011, which are matched with the air source of the air supply pipe.

[0056] Six Φ10mm, δ=1.5mm austenitic stainless steel hollow pipes are used as vent pipes 102, and 10 small holes with a diameter of Φ3mm are drilled at equal intervals on them for venting; then they are cold-bent into a semi-elliptical arc to form a complete curved surface.

[0057] In addition, a section of austenitic stainless steel hollow tube with an L=210mm diameter and a Φ20mm diameter, and two sections with an L=190mm diameter and a Φ10mm diameter are sawn to serve as the auxiliary gas pipe assembly 103. The first tube 1031 with a Φ20mm diameter has holes drilled in the middle and at both ends to assemble with the second tube 1032 and the third tube 1033 with Φ10mm diameters. The first tube 1031 with a Φ20mm diameter is 10mm longer on each side than the second tube 1032 and the third tube 1033 with Φ10mm diameters to increase overall rigidity.

[0058] The main gas pipe 101, the auxiliary gas pipe assembly 103, and the six gas diffuser pipes 102 are connected by tungsten inert gas welding or cold welding. The welding process should not affect the shape of the gas diffuser pipe 102, nor should it block the gas diffuser hole 1021.

[0059] After assembling all parts, the overall weight is less than 2kg, making it easy to install and move. The interior of the mechanism is hollow, allowing for smooth and unobstructed gas flow. The austenitic stainless steel material ensures the mechanism's corrosion resistance, and the welded design between components ensures its strength. The Φ20mm main gas pipe 101 ensures the overall rigidity of the mechanism.

[0060] According to an embodiment of the present invention, on the other hand, see also... Figures 5 to 8 Furthermore, a welding apparatus is provided, including a gas delivery mechanism. Applying the gas delivery mechanism to the welding apparatus provides gas protection and cooling functions for the welding process, effectively solving the problems of workpiece temperature control and thin-walled workpiece protection in related technologies, thereby improving welding quality and production efficiency. Through the gas protection and cooling effect of the gas delivery mechanism, the workpiece temperature can be reduced, preventing workpiece deformation, while protecting the external area of ​​the thin-walled workpiece from damage during the welding process, improving workpiece integrity and performance, and reducing production costs.

[0061] In one embodiment, see Figure 5 and Figure 7 The welding device also includes a turntable base 201, a turntable disk 202, and a fixed support 203. The turntable disk 202 is rotatably mounted above the turntable base 201, and the fixed support 203 is fixedly connected to the turntable base 201, with the fixed support 203 and the turntable disk 202 spaced apart. The turntable base 201 and turntable disk 202 support and fix the welding workpiece 301, allowing it to rotate during the welding process, facilitating welding operations on various parts of the workpiece. The fixed support 203 is used to install and fix the gas delivery mechanism, enabling the mechanism to stably provide gas protection and cooling to the workpiece. This arrangement allows the welding device to achieve automated rotary welding of the workpiece, improving welding efficiency and quality uniformity. Simultaneously, the spaced arrangement between the fixed support 203 and the turntable disk 202 ensures a reasonable distance between the mechanism and the workpiece, ensuring that the gas can be effectively sprayed onto the workpiece surface. The overall structure of the welding device is compact.

[0062] The welding apparatus provided in this embodiment uses a vertical welding method for tubular workpieces. The workpiece 301 is placed on the turntable 202 for welding. The mechanism is fixed on the fixed bracket 203 on the turntable base 201 and is placed horizontally. The angle of the gas dissipation surface formed by the arc-shaped gas dissipation area is fixed and does not rotate with the turntable 202. The welding torch 204 is fed vertically from bottom to top, and the welding direction is from bottom to top. The turntable 202 rotates clockwise, and the workpiece 301 is fixed on the surface of the turntable 202 and rotates with it. The air inlet 1011 is connected to the corresponding gas source through the gas supply pipe.

[0063] See Figure 5 and Figure 6 When used for cooling: the air inlet 1011 is connected to compressed air, and the pressurized airflow is blown directly onto the outer wall of the tubular workpiece being welded on the inner wall through the air diffuser, forming the desired weld overlay 302 on the inner wall. The blowing angle can be directed towards the welding position of the welding torch 204, or not towards the welding position of the welding torch 204. The blowing height is adjusted upwards by the user at regular intervals, generally consistent with the weld overlay height. The airflow on the outer wall of the workpiece does not affect the stability of the arc during the inner wall welding. The airflow can also effectively reduce the workpiece temperature, reduce welding deformation caused by high temperature, ensure the roundness and concentricity of the tubular workpiece, and control the interpass temperature at a low level, meeting the interpass temperature requirements of the welding process and ensuring the weld overlay quality.

[0064] See Figure 7 and Figure 8When used for protection: When the wall thickness of the tubular workpiece is ≤8mm, the inlet 1011 is connected to an inert gas source, and the pressurized inert gas flow is directly blown through the diffuser onto the outer wall of the tubular workpiece being welded on the inner wall, forming the desired weld overlay 302 on the inner wall. For protection, the blowing angle must be directly towards the welding position of the welding torch 204. The blowing height is adjusted upwards by the user at regular intervals, roughly consistent with the weld overlay height. The inert gas flow on the outer wall of the workpiece does not affect the stability of the arc during inner wall welding and can effectively protect the red-hot area of ​​the outer wall, forming a protective atmosphere in the molten pool area of ​​the inner wall weld. Furthermore, the cooled inert gas flow can effectively reduce the workpiece temperature, minimize welding deformation caused by high temperatures, ensure the roundness and concentricity of the tubular workpiece, and control the interpass temperature at a low level, meeting the interpass temperature requirements of the welding process and ensuring weld quality.

[0065] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A gas conveying mechanism, characterized in that, include: The main air pipe (101) has a main air chamber, and one end of the main air pipe (101) is provided with an air inlet (1011) that communicates with the main air chamber. The air inlet (1011) is adapted to communicate with the air supply pipe. At least two air diffuser pipes (102) are provided, each air diffuser pipe (102) having an air diffuser chamber connected to the end of the main air pipe (101) away from the air inlet (1011). Each air diffuser pipe (102) is provided with a plurality of air diffuser holes (1021). All the air diffuser pipes (102) form an arc-shaped air diffuser area, which is located away from the main air pipe (101).

2. The gas conveying mechanism according to claim 1, characterized in that, The gas delivery mechanism also includes a secondary gas pipe assembly (103), which is connected between the main gas pipe (101) and the gas distribution pipe (102) to connect the main gas pipe (101) and the gas distribution pipe (102).

3. The gas conveying mechanism according to claim 2, characterized in that, The auxiliary air tube assembly (103) includes a first tube body (1031), the first tube body (1031) having a first cavity, the first tube body (1031) having a first communication hole communicating with the first cavity, the first communication hole being configured to communicate with one end of the main air tube (101) away from the air inlet (1011), the first tube body (1031) also having a second communication hole communicating with the first cavity, the first cavity being configured to communicate with the air dispersion chamber through the second communication hole, the second communication hole being correspondingly configured with the air dispersion chamber.

4. The gas conveying mechanism according to claim 3, characterized in that, The auxiliary airway assembly (103) further includes a second tube (1032) and a third tube (1033), which are symmetrically arranged on both sides of the first tube (1031).

5. The gas conveying mechanism according to claim 4, characterized in that, The first pipe body (1031) is welded to the main air pipe (101) and all the air distribution pipes (102), and the second pipe body (1032) and the third pipe body (1033) are respectively welded to the air distribution pipes (102) on one side of the first pipe body (1031).

6. The gas conveying mechanism according to claim 3, characterized in that, There are six gas dispersing pipes (102), and all the gas dispersing pipes (102) are symmetrically arranged on both sides of the first pipe body (1031).

7. The gas conveying mechanism according to any one of claims 1-6, characterized in that, All the air diffusers (1021) on the same root are equally spaced on the vertical height plane, and the distance between the projections of any two adjacent air diffusers (1021) on the vertical height plane is set to 25 mm; and / or, The structure of the air diffuser (1021) is set as a circular hole, and the radius of the air diffuser (1021) is set as 1.5 mm.

8. The gas conveying mechanism according to any one of claims 1-6, characterized in that, The gas delivery mechanism further includes an adjusting member (104), which is detachably connected to the main gas pipe (101). The adjusting member (104) has an adjusting sleeve adapted to connect with a fixed bracket (203) extending along the height direction.

9. A welding overlay device, characterized in that, Includes the gas delivery mechanism as described in any one of claims 1-8.

10. The welding apparatus according to claim 9, characterized in that, The welding device further includes a turntable base (201), a turntable disk (202), and a fixed bracket (203). The turntable disk (202) is rotatably disposed above the turntable base (201). The fixed bracket (203) is fixedly connected to the turntable base (201) and is spaced apart from the turntable disk (202).

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