Welding protection dragging cover

Abstract

The utility model relates to the technical field of non-consumable electrode argon arc welding, and discloses a welding protection dragging cover which comprises a cover body, an air inlet pipe and a gun body fixing ring, an air supply channel, an air inlet and an air supply port are arranged in the cover body, the air supply port and the air inlet are respectively communicated with the air supply channel, and the gun body fixing ring is arranged in the gun body fixing ring. The air inlet pipe is connected to the cover body and communicated with the air inlet, the gun body fixing ring is connected to the cover body, and the gun body fixing ring is provided with a welding gun fixing channel extending to the air supply port. According to the welding protection dragging cover, the appearance quality of a welding seam is improved, the ductility and tensile strength of a welding seam structure are improved, and the mechanical property of the welding seam structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of non-melting electrode argon arc welding, in particular to a welding protection drag cover. Background Art

[0002] When existing TIG argon arc welding technology is used to weld Al, Mg, Ti and other alloys, the general manual argon arc welding movement speed is about 1.5-2mm / s, and the robot welding movement speed is about 5-15mm / s. During welding, due to the movement of the welding torch, the gas protection area in the welding zone is limited, causing the high-temperature liquid metal in the welding zone to quickly break away from the cooling protection of the argon gas and be exposed to the atmosphere, rapidly oxidizing and cooling down. The liquid active metal in the weld is not adequately protected by the effective inert gas argon, resulting in a gray-black and black weld appearance, unsatisfactory weld appearance, and unsatisfactory weld microstructure and mechanical properties. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. The utility model provides a welding protective drag cover, which improves the appearance quality of the weld and increases the elongation and tensile strength of the weld structure, thereby improving the mechanical properties of the weld structure.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a welding protection drag cover, including a cover body, an air inlet pipe and a gun body fixing ring, the cover body is provided with an air supply channel, an air inlet and an air supply port, the air supply port and the air inlet are respectively connected to the air supply channel, the air inlet pipe is connected to the cover body and is connected to the air inlet, the gun body fixing ring is connected to the cover body, and the gun body fixing ring is provided with a welding gun fixing channel extending to the air supply port.

[0005] As a preferred embodiment, the air supply channel extends along the first direction, and the cover body is also provided with a side exhaust port and a bottom exhaust port. The air supply port and the side exhaust port are respectively located at the two ends of the air supply channel in the first direction, and the bottom exhaust port is located on the bottom surface of the cover body. The gun body fixing ring is connected to the end of the cover body corresponding to the air supply port.

[0006] As a preferred solution, an air baffle is connected to the upper end of the side exhaust port, and the gas flow area of ​​the side exhaust port is smaller than the gas flow area of ​​the air supply port.

[0007] As a preferred solution, the bottom exhaust port extends along the first direction, and two ends of the bottom exhaust port are respectively connected to the air supply port and the side exhaust port.

[0008] As a preferred solution, the cover body is provided with an air screen with a plurality of air vents formed thereon. The air screen is connected to the cover body and is located in the air supply channel. The air screen is at least located corresponding to the position of the air inlet.

[0009] As a preferred solution, the air inlet is arranged on the top surface of the cover body, and the cover body is provided with an air baffle, which is located above the side exhaust port and at one end of the air supply channel away from the air supply port. One end of the air screen extends to the air supply port, and the other end is connected to the air baffle.

[0010] As a preferred solution, the cover body is provided with a gun body mounting groove corresponding to the position of the gun body fixing ring, and the welding gun fixing channel extends into the air supply channel through at least a portion of the gun body mounting groove.

[0011] As a preferred solution, the air inlet is provided at the upper end of the air supply channel, the width of the upper end of the air supply channel is W1, the width of the bottom exhaust port is W2, and W1>W2.

[0012] As a preferred solution, the length a of the cover body in the first direction is set at 50 mm-120 mm.

[0013] As a preferred solution, the distance between the air inlet and the air supply port in the first direction is b, b=30%*a-50%*a.

[0014] Compared with the prior art, a welding protection hood according to an embodiment of the present invention has the following beneficial effects: an air supply channel, an air inlet and an air supply port are provided in the hood body, the air supply port and the air inlet are respectively communicated with the air supply channel, the air inlet pipe is connected to the hood body and communicated with the air inlet, the shielding gas enters the air supply channel from the air inlet pipe through the air inlet, the air supply channel provides a certain storage space for the shielding gas, the welding gun is fixed to the hood body by a gun body fixing ring, the nozzle of the welding gun extends to the air supply port through the welding gun fixing channel, the welding area is located at the nozzle of the welding gun, since the air supply port is facing the welding gun fixing channel, the distance between the air supply port and the nozzle is small, and the distance between the air supply port and the nozzle is maintained within a certain range, so that the shielding gas coverage range is more accurate, and continuous protection and continuous cooling are provided for the high-temperature molten metal in the welding zone, the oxidation time of the high-temperature metal in the welding zone is delayed, and the appearance quality of the weld is improved. After welding, the weld enters the gas supply channel, and the shielding gas passes through the gas supply channel to quickly exchange heat for the high-temperature metal in the weld. The shielding gas continuously covers the weld surface, allowing the high-temperature metal in the weld to solidify quickly, producing a high-temperature tempering effect on the weld metal structure, refining the structure grains, inhibiting the growth of dendrites, and effectively improving the elongation and tensile strength of the weld structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2It is a side view of an embodiment of the present utility model.

[0017] Figure 3 It is a top view of an embodiment of the present utility model.

[0018] Figure 4 This is an embodiment of the utility model Figure 3 Schematic diagram of the cross-sectional structure at AA.

[0019] In the picture:

[0020] 10. Cover; 11. Air supply channel; 12. Air inlet; 13. Air supply port; 14. Side exhaust port; 15. Bottom exhaust port; 16. Air baffle; 17. Gun body mounting slot;

[0021] 20. Intake pipe;

[0022] 30. Gun body fixing ring; 31. Welding gun fixing channel;

[0023] 40. Air screen; 41. Vent hole. DETAILED DESCRIPTION

[0024] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate orientations or positional relationships are 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should be understood that the terms "connected," "connected," "fixed," etc. used in the present invention should be interpreted broadly. For example, the terms may refer to fixed connection, detachable connection, or integration; mechanical connection, welding connection; direct connection, indirect connection through an intermediate medium, internal communication between two elements, or interaction between two elements, unless otherwise explicitly defined. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] like Figures 1 to 4As shown, a welding protection hood according to a preferred embodiment of the present invention includes a hood body 10, an air inlet pipe 20 and a gun body fixing ring 30. The hood body 10 is provided with an air supply channel 11, an air inlet port 12 and an air supply port 13. The air supply port 13 and the air inlet port 12 are respectively connected to the air supply channel 11, the air inlet pipe 20 is connected to the hood body 10 and is connected to the air inlet port 12, the gun body fixing ring 30 is connected to the hood body 10, and the gun body fixing ring 30 is provided with a welding gun fixing channel 31 extending to the air supply port 13.

[0028] The welding protection drag hood of the present invention is provided with an air supply channel 11, an air inlet 12 and an air supply port 13 in the hood body 10, the air supply port 13 and the air inlet 12 are respectively communicated with the air supply channel 11, the air inlet pipe 20 is connected to the hood body 10 and communicated with the air inlet 12, the shielding gas enters the air supply channel 11 from the air inlet pipe 20 through the air inlet 12, the air supply channel 11 provides a certain storage space for the shielding gas, the welding gun is fixed to the hood body 10 by a gun body fixing ring 30, the nozzle of the welding gun extends to the air supply port 13 through the welding gun fixing channel 31, the welding area is located at the nozzle of the welding gun, because the air supply port 13 is facing the welding gun fixing channel 31, the distance between the air supply port 13 and the nozzle is small, and the distance between the air supply port 13 and the nozzle is maintained in a certain range, so that the shielding gas coverage range is more accurate, providing continuous protection and continuous cooling for the high-temperature molten metal in the welding zone, delaying the oxidation time of the high-temperature metal in the welding zone, and improving the appearance quality of the weld. After welding, the weld enters the gas supply channel 11, and the shielding gas passes through the gas supply channel 11 to quickly exchange heat for the high-temperature metal in the weld. The shielding gas continues to cover the weld surface, so that the high-temperature metal in the weld can be quickly solidified, and a high-temperature tempering effect is produced on the weld metal structure, which refines the structure grains, inhibits the growth of dendrites, and effectively improves the elongation and tensile strength of the weld structure.

[0029] Further, such as Figures 1 to 4 As shown, the gas supply channel 11 extends along a first direction, and the cover body 10 is further provided with a side exhaust port 14 and a bottom exhaust port 15. The gas supply port 13 and the side exhaust port 14 are respectively located at the two ends of the gas supply channel 11 in the first direction, and the bottom exhaust port 15 is located on the bottom surface of the cover body 10. The gun body fixing ring 30 is connected to the end of the cover body 10 corresponding to the gas supply port 13. The gas supply port 13 continuously cools and protects the high-temperature metal in the welding area. During welding, the welding gun moves away from the gas supply channel 11, and the bottom exhaust port 15 and the side exhaust port 14 are located behind the moving direction of the welding gun. The shielding gas in the gas supply channel 11 continuously exchanges heat with the high-temperature metal of the weld entering the gas supply channel 11, and the generated high-temperature airflow is quickly discharged through the bottom exhaust port 15 and the side exhaust port 14 respectively.

[0030] Further, such as Figures 1 to 4 As shown, an air baffle 16 is connected to the upper end of the side exhaust port 14. The gas flow area of ​​the side exhaust port 14 is smaller than the gas flow area of ​​the gas supply port 13. The provision of the air baffle 16 makes the gas flow area of ​​the side exhaust port 14 smaller than the gas flow area of ​​the gas supply port 13. The air baffle 16 reduces the loss of shielding gas at one end of the side exhaust port 14, thereby improving the utilization efficiency of the shielding gas.

[0031] Further, such as Figures 1 to 4 As shown, the bottom exhaust port 15 extends along the first direction, and the two ends of the bottom exhaust port 15 are respectively connected to the air supply port 13 and the side exhaust port 14. The high-temperature gas in the air supply channel 11 is discharged along both sides of the bottom exhaust port 15 perpendicular to the first direction, thereby improving the heat dissipation efficiency of the air supply channel 11 and enhancing the cooling efficiency.

[0032] Further, such as Figures 1 to 4 As shown, the cover body 10 is provided with an air screen 40, which is provided with a plurality of vent holes 41. The air screen 40 is connected to the cover body 10 and is located in the air supply channel 11. The air screen 40 is at least located corresponding to the position of the air inlet 12. The air screen 40 is located in the air supply channel 11 and is provided with a plurality of vent holes 41. This promotes the dispersion of the protective gas entering the air inlet 12 through the vent holes 41, thereby improving the gas dispersion in the air supply channel 11 and promoting the diversion of the protective gas.

[0033] As one embodiment, Figures 1 to 4 As shown, the ventilation holes 41 in the air screen 40 are evenly distributed.

[0034] As one embodiment, the air screen 40 is set at 30-40 meshes. Preferably, the air screen 40 is set at 40 meshes to ensure gas fluidity while promoting gas diversion.

[0035] As one embodiment, the air screen 40 includes a 10-mesh coarse screen and a 40-mesh fine screen. The coarse screen is connected to the inner wall of the air supply channel 11 to form a skeleton, and the fine screen is laid on the coarse screen. The fine screen disperses the protective gas, and the coarse screen fixes the fine screen, thereby improving the installation stability of the air screen 40.

[0036] Further, such as Figures 1 to 4As shown, the air inlet 12 is provided on the top surface of the cover body 10. The cover body 10 is provided with an air baffle 16. The air baffle 16 is located above the side exhaust port 14 and at the end of the air supply channel 11 away from the air supply port 13. One end of the air screen 40 extends to the air supply port 13, and the other end is connected to the air baffle 16. The provision of the air screen 40 allows the shielding gas to be evenly dispersed in the first direction. At the same time, the provision of the air baffle 16 reduces the shielding gas from being discharged from the side exhaust port 14, prompting the shielding gas to act on the high-temperature metal of the weld in the air supply channel 11, thereby improving the effective utilization rate of the gas. At the same time, it ensures that the high-temperature gas after heat exchange is discharged from the side exhaust port 14 to ensure a cooling effect.

[0037] Further, such as Figure 1 As shown, the cover body 10 is provided with a gun body mounting groove 17 corresponding to the position of the gun body fixing ring 30, and the welding gun fixing channel 31 extends into the gas supply channel 11 through the gun body mounting groove 17 at least in part, so that when the spray gun is installed on the welding gun fixing channel 31 through the gun body mounting groove 17, at least a part of it extends into the gas supply channel 11, shortening the distance between the spray gun and the gas supply channel 11, and further shortening the distance between the spray gun and the shielding gas, thereby improving the protection and cooling effect of the shielding gas on the weld.

[0038] Further, such as Figure 2 As shown, the air inlet 12 is provided at the upper end of the air supply channel 11. The width of the upper end of the air supply channel 11 is W1, and the width of the bottom exhaust port 15 is W2, where W1>W2. Because W1 is greater than W2, the airflow undergoes a natural diffusion process upon entering the air supply channel 11. However, as the channel extends downward and narrows, the airflow is gradually guided and concentrated, ensuring that the airflow is more concentrated upon reaching the bottom exhaust port 15, thereby increasing the airflow speed and pressure, and achieving a more efficient air supply effect.

[0039] Further, such as Figure 3 As shown, the length a of the cover body 10 in the first direction is set at 50 mm to 120 mm. Under the premise of ensuring the protection effect of the inert gas, the convenience and smoothness of the synchronous movement of the cover body 10 and the welding gun are ensured.

[0040] Further, such as Figures 1 to 3 As shown, the distance between the air inlet 12 and the air supply port 13 in the first direction is b, where b=30%*a-50%*a. Placing the air inlet 12 closer to the air supply port 13 allows the shielding gas to be supplied to the welding area first, thus ensuring weld quality.

[0041] The utility model uses a welding shield that, while maintaining the main structure of the argon arc welding gun, adds an inert gas argon inlet pipe connected to the air inlet. The argon arc welding gun head is secured to the shield via a gun body retaining ring, or metal clamp. The strip-shaped shield extends over the weld, increasing the protective range of the inert gas argon. When the argon arc welding machine is started, approximately ten seconds before welding, after pressing the arc start switch on the argon arc welding gun, argon gas is supplied to the strip-shaped shield with a gas screen to expel air from the welding area. The argon flow rate is approximately two-thirds of the shielding gas flow rate for the actual argon arc welding process, typically about 10 L / min. Using this device effectively protects the high-temperature molten metal in the welding area, delaying oxidation of the high-temperature metal in the welding area. This improves the appearance quality of the weld, resulting in a shiny, metallic appearance. Internal microstructure and chemical performance tests compared the processes with and without the drag shield, with all other parameters remaining the same. The following comparative data was obtained:

[0042]

[0043] In the welding experiment with sample number A1, the base material test plate was AA7075, 200mm*100mm*3mm long, and the filler material was nano super aluminum alloy welding wire 7075NT. The aluminum alloy welds obtained by welding using the device of the present invention have a uniform appearance, consistent height and width, and the weld color is bright white with a metallic luster. Under the protection of the argon gas in the long strip gas supply channel of the device, the high-temperature metal molten in the welding zone is effectively cooled, and the time the high-temperature metal is exposed to the atmosphere is delayed, effectively reducing the oxidation of the welding zone. Under the protection of the device, the weld structure is refined and a high-temperature tempering effect is produced on the weld structure, thereby improving the yield strength, tensile strength, and elongation of the weld structure.

[0044] Sample number B1 welding experiment, base material test plate grade AA7075, 200mm * 100mm * 3mm long, filled with nano super aluminum alloy welding wire 7075NT. Aluminum alloy welds produced without the device of the present invention, while uniform in appearance, with consistent height and width, were observed. However, due to the small diameter of the gas shield nozzle of the argon arc welding torch and its limited shielding range during welding, the hot metal in the weld zone was exposed to the atmosphere before it fully cooled during torch movement, causing rapid oxidation. This resulted in the weld losing the natural color of the base metal. Furthermore, the resulting weld structure exhibited low yield strength, tensile strength, and elongation.

[0045] In summary, an embodiment of the present invention provides a welding protection drag hood, wherein an air supply channel 11, an air inlet 12 and an air supply port 13 are provided in the hood body 10, and the air supply port 13 and the air inlet 12 are respectively communicated with the air supply channel 11, and the air inlet pipe 20 is connected to the hood body 10 and communicated with the air inlet 12, and the shielding gas enters the air supply channel 11 from the air inlet pipe 20 through the air inlet 12, and the air supply channel 11 provides a certain storage space for the shielding gas, and the welding gun is fixed to the hood body 10 by the gun body fixing ring 30, and the nozzle of the welding gun extends to the air supply port 13 through the welding gun fixing channel 31, and the welding area is located at the nozzle of the welding gun. Since the air supply port 13 is facing the welding gun fixing channel 31, the distance between the air supply port 13 and the nozzle is small, and the distance between the air supply port 13 and the nozzle is maintained within a certain range, so that the shielding gas coverage range is more accurate, and continuous protection and continuous cooling are provided for the high-temperature molten metal in the welding zone, which delays the oxidation time of the high-temperature metal in the welding zone and improves the appearance quality of the weld. After welding, the weld enters the gas supply channel 11, and the shielding gas passes through the gas supply channel 11 to quickly exchange heat for the high-temperature metal in the weld. The shielding gas continues to cover the weld surface, so that the high-temperature metal in the weld can be quickly solidified, and a high-temperature tempering effect is produced on the weld metal structure, which refines the structure grains, inhibits the growth of dendrites, and effectively improves the elongation and tensile strength of the weld structure.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A welding protective hood, characterized by: It includes a cover body, an air intake pipe and a gun body fixing ring. The cover body is provided with an air supply channel, an air intake port and an air supply port. The air supply port and the air intake port are respectively connected to the air supply channel. The air intake pipe is connected to the cover body and is connected to the air intake port. The gun body fixing ring is connected to the cover body. The gun body fixing ring is provided with a welding gun fixing channel extending to the air supply port.

2. The welding protective hood according to claim 1, characterized in that: The air supply channel extends along the first direction, and the cover body is also provided with a side exhaust port and a bottom exhaust port. The air supply port and the side exhaust port are respectively located at the two ends of the air supply channel in the first direction, and the bottom exhaust port is located on the bottom surface of the cover body. The gun body fixing ring is connected to the end of the cover body corresponding to the air supply port.

3. The welding protective hood according to claim 2, characterized in that: An air baffle is connected to the upper end of the side exhaust port, and the gas flow area of ​​the side exhaust port is smaller than the gas flow area of ​​the air supply port.

4. The welding protective hood according to claim 2, characterized in that: The bottom exhaust port extends along the first direction, and two ends of the bottom exhaust port are respectively connected to the air supply port and the side exhaust port.

5. The welding protective hood according to claim 2, characterized in that: The cover body is provided with an air screen, a plurality of air vents are opened on the air screen, the air screen is connected to the cover body and is located in the air supply channel, and the air screen is at least located corresponding to the position of the air inlet.

6. The welding protective hood according to claim 5, characterized in that: The air inlet is arranged on the top surface of the cover body, and the cover body is provided with an air baffle, which is located above the side exhaust port and at one end of the air supply channel away from the air supply port. One end of the air screen extends to the air supply port, and the other end is connected to the air baffle.

7. The welding protective hood according to claim 2, characterized in that: The cover body is provided with a gun body mounting groove corresponding to the position of the gun body fixing ring, and the welding gun fixing channel extends into the air supply channel through at least a portion of the gun body mounting groove.

8. The welding protective hood according to claim 2, characterized in that: The air inlet is provided at the upper end of the air supply channel, the width of the upper end of the air supply channel is W1, the width of the bottom exhaust port is W2, and W1>W2.

9. The welding protective hood according to claim 1, characterized in that: The length a of the cover body in the first direction is set at 50mm-120mm.

10. The welding protective hood according to claim 9, characterized in that: The distance between the air inlet and the air supply port in the first direction is b, where b=30%*a-50%*a.

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