Welding atmosphere protection device and using method

Abstract

The invention provides a welding atmosphere protection device and a using method.The welding atmosphere protection device comprises an atmosphere protection box, an atmosphere protection cover and a dragging cover, the atmosphere protection box comprises a box body and a box cover, a containing space is defined in the box body and used for containing a to-be-welded test plate, the box cover covers the box body, a through groove is formed in the middle of the box cover, and the dragging cover is arranged in the through groove; the through groove is formed by extending in the length direction of a weld joint of a test plate to be welded, the atmosphere protection cover and the dragging cover are buckled above the through groove and can move back and forth above the through groove, the atmosphere protection cover is connected with the welding gun and the gas guide pipe, the welding gun is arranged between the atmosphere protection cover and the dragging cover, and the gas guide pipe is used for introducing protection gas into the atmosphere protection box. The to-be-welded test plate is located in the space formed by the atmosphere protection box, the atmosphere protection cover and the dragging cover, so that the to-be-welded test plate is comprehensively protected, the to-be-welded test plate is effectively protected in the welding process and prevented from being oxidized, and welding defects are reduced. And the gas guide pipe is used for introducing shielding gas, and a shielding gas wall is formed at the through groove, so that gas in the external environment is prevented from flowing into the through groove from the edge of the through groove. The dragging cover is used for covering the position, not covered by the atmosphere protection cover, of the through groove, gas in the external environment can be prevented from entering, and shielding gas can be effectively prevented from leaking.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a welding atmosphere protection device and a use method thereof. Background Art

[0002] Titanium alloys are widely used in aerospace, automobile manufacturing, medical equipment and other fields due to their excellent properties such as light weight, high strength and corrosion resistance. Studies have found that welding titanium alloys after high-temperature (300-700℃) preheating can greatly improve the toughness of the material. However, during the welding process after high-temperature preheating, especially during the high-temperature preheating stage, titanium alloys have high chemical activity and are very easy to react with oxygen and nitrogen in the air, resulting in oxidation of the weld and the surrounding area, thereby reducing the plasticity and toughness of the welded joint and affecting the welding quality.

[0003] CN115156715A discloses a device and method for laser welding vector gas supply protection, including a welding machine body, a hollow rotating motor at the bottom of the welding machine body, a double-layer protective air blowing pipe connected below the hollow rotating rotating motor, two protective air paths in the welding machine body and the double-layer protective air blowing pipe, the two protective air paths are respectively a first air blowing protective air path and a second air blowing protective air path, a first air port and a second air port are respectively connected to the first air blowing protective air path and the second air blowing protective air path on the welding machine body, and the first air port is located above the second air port. Aiming at the problem of easy oxidation in the traditional laser welding process of titanium alloy, aluminum alloy, high-temperature alloy, etc., the device designs and manufactures a welding protection hood with rotatable vector tracking, and uses a hollow rotating motor to drive the welding protection hood to rotate in a positioning manner, so that the welding protection hood is always parallel to the direction of the weld path, thereby forming effective protection. However, this patent application can only realize that the welding protection hood 7 is placed behind the welding motion trajectory during welding, and it cannot effectively isolate the influence of air in the external environment on the welding workpiece during the high-temperature preheating stage. Summary of the invention

[0004] In view of this, the present invention aims to provide a welding atmosphere protection device and a method of use, which can effectively prevent the titanium alloy test plate from being oxidized during the high-temperature preheating stage and the welding stage.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A welding atmosphere protection device includes an atmosphere protection box, an atmosphere protection hood and a drag hood. The atmosphere protection box includes a box body and a box cover. A storage space is defined in the box body for placing a test plate to be welded. The box cover is closed on the top of the box body. A through slot is provided in the middle of the box cover. The through slot is formed along the length direction of the weld of the test plate to be welded. The atmosphere protection hood and the drag hood are buckled on the top of the through slot and can move back and forth on the top of the through slot. The atmosphere protection hood is connected to a welding gun and an air duct respectively. The welding gun is arranged between the atmosphere protection hood and the drag hood. The air duct is used to pass the protective gas into the atmosphere protection box. The test plate to be welded is located in the space formed by the atmosphere protection box, the atmosphere protection hood and the drag hood, so that the test plate to be welded is protected in all directions, and effective protection is achieved for the test plate to be welded during welding, preventing it from being oxidized and reducing the occurrence of welding defects. The air duct is used to pass the protective gas and form a protective gas wall at the through slot to prevent the gas in the external environment from flowing into the atmosphere protection box from the edge of the through slot and affecting the welding quality. The drag cover is used to cover the part of the through slot that is not covered by the atmosphere protection cover, which can not only prevent the gas from the external environment from entering, but also effectively prevent the protection gas from leaking out.

[0007] Furthermore, the atmosphere protection cover includes a first air duct, a second air duct and a cover body, the first air duct and the second air duct are both connected to the cover body, and the second air duct can move in the up and down directions, and the cover body is buckled on the top of the through groove. The non-fixed second air duct can be adjusted up and down according to the welding thickness to ensure that there is always enough protective gas around the weld at each position to discharge other gases around the weld to avoid oxidation.

[0008] Furthermore, the first air duct passes through the cover body, and the air inlet end of the first air duct is connected to the protective gas source, and the air outlet end is arranged at the through groove; the second air duct passes through the cover body, and the air inlet end of the second air duct is connected to the protective gas source, and the air outlet end extends into the atmosphere protection box. The air outlet end of the first air duct is arranged at the through groove, and the protective gas is used to form a barrier at the through groove to prevent the gas in the external environment from entering the atmosphere protection box from the vicinity of the through groove. The fixed first air duct and the non-fixed second air duct cooperate to better prevent oxidation of the test plate to be welded.

[0009] Furthermore, the atmosphere protection box is composed of an insulation layer and a cooling layer from the inside to the outside, and a heating device is arranged between the bottom of the test plate to be welded and the insulation layer at the bottom. The heating device is used to provide the heat required for high-temperature preheating. The heating device is arranged at the bottom of the test plate to be welded, which is conducive to heating uniformity. The insulation layer is used to reduce heat loss to the outside and improve preheating efficiency. The cooling layer is used to quickly cool down the outside of the test plate to be welded after welding is completed to prevent burns to personnel.

[0010] Furthermore, the atmosphere protection box also includes a temperature measuring device for real-time monitoring of the temperature inside the atmosphere protection box and temperature control through a cooling layer to ensure that the temperature is always within a suitable range during the welding process.

[0011] Furthermore, the box cover includes a first box cover and a second box cover, and the first box cover and the second box cover can both move in the left-right direction above the box body. When the first box cover and the second box cover move in opposite directions, the atmosphere protection box is opened to facilitate the placement or removal of the test plate to be welded. When the first box cover and the second box cover move toward each other, the atmosphere protection box is closed, and a through groove is provided between the first box cover and the second box cover.

[0012] Furthermore, a first transparent cover plate and a second transparent cover plate are arranged above the box cover, the through groove is located between the two transparent cover plates, a guide groove is arranged on the right side of the first transparent cover plate, and a guide groove is arranged on the left side of the second transparent cover plate, and the atmosphere protection cover can move along the guide groove.

[0013] Compared with the prior art, the welding atmosphere protection device of the present invention has the following advantages:

[0014] (1) By setting up an atmosphere protection box and using a drag hood in combination with an atmosphere protection hood, the test plate to be welded is placed in a closed space when a protective gas is introduced to prevent oxidation from affecting the welding quality, thereby improving the plasticity and toughness of the welded joint.

[0015] (2) In addition to setting a fixed first air duct to introduce protective gas into the through groove to prevent air from the external environment from entering the atmosphere protection box, a movable second air duct is also provided to move up and down in the thickness direction to ensure that the distance between the air outlet end of the second air duct and the weld is always maintained at 12 to 20 mm. Therefore, when welding each layer of weld, protective gas is introduced into the weld to discharge the air at the weld, effectively preventing oxidation, which is suitable for welding thick test plates with grooves.

[0016] (3) The welding atmosphere protection device of the present invention can be adjusted according to the different sizes and shapes of the test plates to be welded, and has strong adaptability.

[0017] Another aspect of the present invention further provides a method for using a welding atmosphere protection device, wherein the method uses the above-mentioned welding atmosphere protection device and comprises the following steps:

[0018] Preparation stage:

[0019] Put the test plate to be welded into the atmosphere protection box, move the first box cover and the second box cover in opposite directions, place the first transparent cover plate and the second transparent cover plate on the top of the box cover, form a through slot in the gap between the first box cover and the second box cover, and form a through slot in the gap between the first transparent cover plate and the second transparent cover plate, cover the first transparent cover plate and the second transparent cover plate with the atmosphere protection cover and the drag cover to ensure that the atmosphere protection cover and the drag cover cover the through slot;

[0020] Start the heating device, set the preheating temperature and time according to the type and thickness of the test plate to be welded, and fill the atmosphere protection box with protective gas through the first air duct and the second air duct;

[0021] Warm-up phase:

[0022] When the preheating temperature reaches the set value, turn off the heating device;

[0023] Welding stage:

[0024] Start the welding gun, adjust the welding current, welding speed and shielding gas flow rate according to the welding parameters, move the welding gun back and forth in the front-to-back direction according to the set weld path, and realize the welding of all welds. The movement of the welding gun drives the atmosphere protection cover and the drag cover to move synchronously, ensuring that when the welding gun moves in the through slot, the atmosphere protection cover and the drag cover cover the through slot; at the same time, the first gas duct and the second gas duct also move synchronously in the front-to-back direction, and keep the gas outlet end of the first gas duct set at the through slot, and the gas outlet end of the second gas duct extends into the atmosphere protection box and is located 12 to 20 mm above the weld;

[0025] Cooling phase:

[0026] After welding is completed, turn off the welding gun, increase the cooling water flow rate to quickly cool down the test plate to be welded, and determine whether the internal temperature of the atmosphere protection box is lower than 150°C. If so, close the first air duct and the second air duct;

[0027] Cleaning phase:

[0028] After the test plate to be welded has cooled to room temperature, remove the atmosphere protection cover and the drag cover, open the box cover, take out the test plate to be welded for cleaning and inspection, and clean the atmosphere protection box.

[0029] Furthermore, during the welding stage, when it is monitored that the temperature inside the atmosphere protection box is higher than 280° C., the flow rate of cooling water in the cooling layer is increased to reduce the temperature.

[0030] The method of using the welding atmosphere protection device is the same as the advantages of the above-mentioned welding atmosphere protection device over the prior art, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 It is a structural schematic diagram of the welding atmosphere protection device of the present invention;

[0033] Figure 2 This is a structural schematic diagram of the welding atmosphere protection device of the present invention without the second transparent cover plate and part of the box body;

[0034] Figure 3 a is a partial schematic diagram of the welding atmosphere protection device of the present invention;

[0035] Figure 3 b is Figure 3 a cross-sectional view;

[0036] Figure 3 c is Figure 3 Schematic diagram of the welding gun and the atmosphere protection cover moving forward in state a;

[0037] Figure 3 d is Figure 3 Schematic diagram of the second airway moving upward in state c.

[0038] Description of reference numerals:

[0039] 1. Atmosphere protection box; 11. Heating device; 12. Heat insulation layer; 13. Cooling layer; 14. Temperature measuring device; 15. Box cover; 16. Water pipeline; 2. Atmosphere protection cover; 21. First air duct; 22. Second air duct; 23. Cover body; 3. Drag cover; 4. Test plate to be welded; 5. Welding gun; 6. First transparent cover plate; 7. Second transparent cover plate. DETAILED DESCRIPTION

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. The embodiments described in the present invention are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0041] It should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0042] like Figures 1-2 As shown, a welding atmosphere protection device includes an atmosphere protection box 1, an atmosphere protection hood 2 and a drag hood 3, the atmosphere protection box 1 includes a box body and a box cover 15, the box body defines a accommodating space for placing a test plate 4 to be welded, the box cover 15 is covered on the top of the box body, a through groove is provided in the middle of the box cover 15, the through groove is extended along the length direction of the weld of the test plate 4 to be welded, the atmosphere protection hood 2 and the drag hood 3 are buckled on the top of the through groove, and can move back and forth on the top of the through groove, the atmosphere protection hood 2 is respectively connected to the welding gun 5 and the air duct, the welding gun 5 is arranged between the atmosphere protection hood 2 and the drag hood 3, and the air duct is used to pass the protective gas into the atmosphere protection box 1.

[0043] The test plate 4 to be welded has high chemical activity during high-temperature preheating and welding after high-temperature preheating, and is easy to react with oxygen, nitrogen, etc. in the air. The test plate 4 to be welded is located in the space formed by the atmosphere protection box 1, the atmosphere protection cover 2 and the drag cover 3, thereby forming an all-round protection for the test plate 4 to be welded, realizing effective protection of the test plate 4 to be welded during the welding process, preventing it from being oxidized, thereby improving the plasticity and toughness of the welded joint, and reducing the occurrence of welding defects. The air duct is used to introduce protective gas and form a protective gas wall at the through groove to prevent gas in the external environment from flowing into the atmosphere protection box 1 from the edge of the through groove and affecting the welding quality. The drag cover 3 is used to cover the part of the through groove that is not covered by the atmosphere protection cover 2, which can not only prevent gas from the external environment from entering, but also effectively prevent the leakage of protective gas.

[0044] Furthermore, the test plate 4 to be welded is made of titanium alloy. The welding gun 5 adopts tungsten inert gas arc welding, which has the advantages of fast welding speed, good weld quality, small heat-affected zone, etc., and is suitable for welding difficult-to-weld materials such as titanium alloy.

[0045] The front of the welding gun 5 is the drag cover 3, and the rear is the atmosphere protection cover 2. When the welding gun 5 moves back and forth in the front and rear directions of welding, the atmosphere protection cover 2 and the drag cover 3 also move synchronously in the front and rear directions.

[0046] As a preferred example of the present invention, the atmosphere protection cover 2 includes a first air duct 21, a second air duct 22 and a cover body 23. The first air duct 21 and the second air duct 22 are both connected to the cover body 23, and the second air duct 22 can move in the up and down directions. The cover body 23 is buckled on the top of the through groove.

[0047] The cover body 23 can not only be used to cover part of the through groove, but also provide an installation site for the first air duct 21 and the second air duct 22. For the thick test plate 4 to be welded with a groove, if only a fixed air duct is set, in the initial stage of welding, the distance between the air duct and the weld of the lowest layer is large, which may cause the shielding gas to be unable to reach the weld of the lowest layer, or residual air in the weld of the lower layer, which is not conducive to the welding quality and stability. The non-fixed second air duct 22 can be adjusted up and down according to the welding thickness to ensure that there is always enough shielding gas around the weld at each position to discharge other gases around the weld and avoid oxidation. Furthermore, the second air duct 22 is adjusted in position according to the welding thickness. In the thickness direction, the distance between the second air duct 22 and the weld is 12 to 20 mm.

[0048] Furthermore, the first air duct 21 passes through the cover body 23, and the air inlet end of the first air duct 21 is connected to the protective gas source, and the air outlet end is arranged at the through groove, and the second air duct 22 passes through the cover body 23, and the air inlet end of the second air duct 22 is connected to the protective gas source, and the air outlet end extends into the atmosphere protection box 1.

[0049] The shielding gas source is used to provide shielding gas, and the shielding gas is an inert gas argon and / or helium. The outlet end of the first air duct 21 is arranged at the through groove, and the shielding gas is used to form a barrier at the through groove to prevent the gas in the external environment from entering the atmosphere protection box 1 from the vicinity of the through groove. The outlet end of the second air duct 22 is adjusted to be 12 to 20 mm away from the weld. The fixed first air duct 21 and the non-fixed second air duct 22 cooperate to better prevent oxidation of the test plate 4 to be welded. The use of inert gas as shielding gas avoids the emission of harmful substances.

[0050] Furthermore, the atmosphere protection box 1 comprises a heat insulation layer 12 and a cooling layer 13 from the inside to the outside, and a heating device 11 is arranged between the bottom of the test plate 4 to be welded and the heat insulation layer 12 at the bottom.

[0051] The heating device 11 is used to provide the heat required for high-temperature preheating. The heating device 11 is arranged at the bottom of the test plate 4 to be welded, which is conducive to heating uniformity. The thermal insulation layer 12 is used to reduce heat loss to the outside and improve preheating efficiency. The cooling layer 13 is used to quickly cool down the outside of the test plate 4 to be welded after welding is completed to prevent people from being scalded. Specifically, the cooling layer 13 is a water cooling device, which is connected to the water pipe 16, and cold water is passed into the water pipe 16 so that the cooling layer 13 works to cool down.

[0052] The atmosphere protection box 1 also includes a temperature measuring device 14, which is used to monitor the temperature inside the atmosphere protection box 1 in real time, and to control the temperature through the cooling layer 13 to ensure that the welding process is always within a suitable temperature range. As the welding progresses, the weld space gradually decreases, the heat of the test plate 4 to be welded continues to increase, and the temperature in the atmosphere protection box 1 also continues to increase. When the temperature reaches 280°C, the cooling water flow of the water inlet pipe 16 is adjusted to cool down.

[0053] In order to facilitate the removal of the test plate 4 to be welded from the atmosphere protection box 1, the box cover 15 includes a first box cover and a second box cover, both of which can move in the left and right directions above the box body. When the first box cover and the second box cover move in opposite directions, the atmosphere protection box 1 is opened to facilitate the placement or removal of the test plate 4 to be welded. When the first box cover and the second box cover move toward each other, the atmosphere protection box 1 is closed, and a through groove is provided between the first box cover and the second box cover.

[0054] A first transparent cover plate 6 and a second transparent cover plate 7 are arranged above the box cover 15, and the through groove is located between the two transparent cover plates. A guide groove is arranged on the right side of the first transparent cover plate 6, and a guide groove is arranged on the left side of the second transparent cover plate 7. The atmosphere protection cover 2 can move along the guide groove to prevent position displacement. The transparent cover plate is used to observe the working status in the atmosphere protection box 1 and the welding status of the test plate 4 to be welded. Both transparent cover plates can move in the left and right directions above the box body. Considering the high temperature during welding, the first transparent cover plate 6 and the second transparent cover plate 7 are transparent quartz glass plates to avoid the adverse effects of high welding temperature.

[0055] The welding atmosphere protection device of the present invention is provided with an atmosphere protection box 1, and uses a drag hood 3 to cooperate with the atmosphere protection hood 2. When the protective gas is introduced, the test plate 4 to be welded is placed in a closed space to prevent oxidation from affecting the welding quality, thereby improving the plasticity and toughness of the welded joint. In addition to providing a fixed first air guide 21 to introduce protective gas into the through groove to prevent air in the external environment from entering the atmosphere protection box 1, a movable second air guide 22 is also provided to move up and down in the thickness direction to ensure that the distance between the air outlet end of the second air guide 22 and the weld is always maintained at 12 to 20 mm, so that when each layer of weld is welded, protective gas is introduced into the weld to discharge the air at the weld, effectively preventing oxidation, and is suitable for welding a large thickness test plate 4 to be welded with a groove. In addition, the welding atmosphere protection device of the present invention can be adjusted according to test plates 4 to be welded of different sizes and shapes, and has strong adaptability.

[0056] In the present invention, the welding gun 5, the atmosphere protection cover 2, the drag cover 3 and the second air guide tube 22 can be moved manually by hand or driven by an automatic translation device.

[0057] A method for using a welding atmosphere protection device of the present invention comprises the following steps:

[0058] Preparation stage:

[0059] The test plate 4 to be welded is placed in the atmosphere protection box 1, the first box cover and the second box cover are moved in opposite directions, the first transparent cover plate 6 and the second transparent cover plate 7 are placed above the box cover 15, the gap between the first box cover and the second box cover forms a through groove, the gap between the first transparent cover plate 6 and the second transparent cover plate 7 forms a through groove, the atmosphere protection cover 2 and the drag cover 3 are covered above the first transparent cover plate 6 and the second transparent cover plate 7, and it is ensured that the atmosphere protection cover 2 and the drag cover 3 cover the through groove;

[0060] The heating device 11 is started, and the preheating temperature and time are set according to the type and thickness of the test plate 4 to be welded, and the protective gas is filled into the atmosphere protection box 1 through the first air duct 21 and the second air duct 22;

[0061] Warm-up phase:

[0062] When the preheating temperature reaches the set value, the heating device 11 is turned off;

[0063] Welding stage:

[0064] Start the welding gun 5, adjust the welding current, welding speed and shielding gas flow rate according to the welding parameters, and move the welding gun 5 back and forth in the front-to-back direction according to the set weld path to achieve welding of all welds. The movement of the welding gun 5 drives the atmosphere protection cover 2 and the drag cover 3 to move synchronously, ensuring that when the welding gun 5 moves in the through groove, the atmosphere protection cover 2 and the drag cover 3 cover the through groove; at the same time, the first air duct 21 and the second air duct 22 also move synchronously in the front-to-back direction, and keep the gas outlet end of the first air duct 21 set at the through groove, and the gas outlet end of the second air duct 22 extends into the atmosphere protection box 1 and is located 12 to 20 mm above the weld;

[0065] Cooling phase:

[0066] After welding is completed, the welding gun 5 is turned off, and the cooling water flow rate is increased to quickly cool down the test plate 4 to be welded, and it is determined whether the internal temperature of the atmosphere protection box 1 is lower than 150° C. If so, the first air duct 21 and the second air duct 22 are turned off;

[0067] Cleaning phase:

[0068] After the test plate 4 to be welded is cooled to room temperature, the atmosphere protection cover 2 and the drag cover 3 are removed, the box cover 15 is opened, the test plate 4 to be welded is taken out for cleaning and inspection, and the atmosphere protection box 1 is cleaned.

[0069] Specifically, during the preheating stage, the temperature inside the atmosphere protection box 1 is monitored in real time by the temperature measuring device 14 , and the stability and accuracy of the preheating temperature are maintained by adjusting the power of the heating device 11 .

[0070] Specifically, during the welding stage, when welding any layer of weld, such as Figure 3 As shown in a to 3c, the welding gun 5 moves forward, the atmosphere protection cover 2 and the drag cover 3 move synchronously, and accordingly, the first air guide pipe 21 moves synchronously in the through groove, and the second air guide pipe 22 moves downward to a distance of 12 to 20 mm from the weld layer and then moves forward synchronously; when welding the next weld layer, as shown in FIG. Figure 3 As shown in FIG. d, the welding gun 5 moves forward, the atmosphere protection cover 2 and the drag cover 3 move synchronously, and accordingly, the first air guide pipe 21 also moves in the through groove, and the second air guide pipe 22 moves upward to a position where its outlet end is 12 to 20 mm away from the weld layer, and then moves forward synchronously. The speed at which the second air guide pipe 22 moves upward depends on the welding speed. The faster the welding speed, the faster the second air guide pipe 22 moves upward.

[0071] During welding, as each layer of weld is welded, the space is continuously reduced, and the gas flow of the first gas duct 21 and the second gas duct 22 can be reduced, thereby reducing the consumption of the protective gas while ensuring the formation of a protective gas wall to improve airtightness.

[0072] During the welding stage, the temperature inside the atmosphere protection box 1 is monitored in real time by the temperature measuring device 14, and the working state of the cooling layer 13 is adjusted as needed. Specifically, when the temperature inside the atmosphere protection box 1 is monitored to be higher than 280°C, the flow rate of cooling water in the cooling layer 13 is increased to reduce the temperature.

[0073] Specifically, during the cooling stage, when the internal temperature of the atmosphere protection box 1 is lower than 150° C., the first air duct 21 and the second air duct 22 are closed to ensure that the weld has a lower welding residual stress and prevent the welding material from reacting with oxygen, nitrogen, etc. in the air.

[0074] It should be noted that the length direction described in the present invention refers to the front-to-back direction in the figure, and the thickness direction described in the present invention refers to the up-down direction in the figure.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding atmosphere protection device, characterized in that: The invention comprises an atmosphere protection box (1), an atmosphere protection cover (2) and a drag cover (3), wherein the atmosphere protection box (1) comprises a box body and a box cover (15), wherein a storage space is defined in the box body for placing a test plate (4) to be welded, wherein the box cover (15) covers the top of the box body, wherein a through groove is provided in the middle of the box cover (15), wherein the through groove extends along the length direction of the weld seam of the test plate (4) to be welded, wherein the atmosphere protection cover (2) and the drag cover (3) are buckled on the top of the through groove and can move back and forth on the top of the through groove, wherein the atmosphere protection cover (2) is connected to a welding gun (5) and an air duct respectively, wherein the welding gun (5) is arranged between the atmosphere protection cover (2) and the drag cover (3), and wherein the air duct is used for passing protective gas into the atmosphere protection box (1).

2. The welding atmosphere protection device according to claim 1, characterized in that: The atmosphere protection cover (2) comprises a first air duct (21), a second air duct (22) and a cover body (23); the first air duct (21) and the second air duct (22) are both connected to the cover body (23); the second air duct (22) can move in the up and down directions; and the cover body (23) is buckled above the through groove.

3. The welding atmosphere protection device according to claim 2, characterized in that: The first air guide pipe (21) passes through the cover body (23), and the air inlet end of the first air guide pipe (21) is connected to a protective gas source, and the air outlet end is arranged at the through groove; the second air guide pipe (22) passes through the cover body (23), and the air inlet end of the second air guide pipe (22) is connected to a protective gas source, and the air outlet end extends into the atmosphere protection box (1).

4. The welding atmosphere protection device according to claim 1, characterized in that: The atmosphere protection box (1) comprises a heat insulation layer (12) and a cooling layer (13) from the inside to the outside, and a heating device (11) is arranged between the bottom of the test plate (4) to be welded and the heat insulation layer (12) located at the bottom.

5. The welding atmosphere protection device according to claim 1, characterized in that: The atmosphere protection box (1) also includes a temperature measuring device (14).

6. The welding atmosphere protection device according to claim 1, characterized in that: The box cover (15) comprises a first box cover and a second box cover, and the first box cover and the second box cover are both movable above the box body along the left-right direction.

7. The welding atmosphere protection device according to claim 1, characterized in that: A first transparent cover plate (6) and a second transparent cover plate (7) are arranged above the box cover (15); the through groove is located between the two transparent cover plates; a guide groove is arranged on the right side of the first transparent cover plate (6); and a guide groove is arranged on the left side of the second transparent cover plate (7); and the atmosphere protection cover (2) can move along the guide groove.

8. A method for using the welding atmosphere protection device according to any one of claims 1 to 7, characterized in that: The steps include: Preparation stage: The test plate (4) to be welded is placed in the atmosphere protection box (1), the first box cover and the second box cover are moved in opposite directions, the first transparent cover plate (6) and the second transparent cover plate (7) are placed above the box cover (15), the gap between the first box cover and the second box cover forms a through groove, the gap between the first transparent cover plate (6) and the second transparent cover plate (7) forms a through groove, the atmosphere protection cover (2) and the drag cover (3) are covered above the first transparent cover plate (6) and the second transparent cover plate (7), and it is ensured that the atmosphere protection cover (2) and the drag cover (3) cover the through groove; The heating device (11) is started, the preheating temperature and time are set according to the type and thickness of the test plate (4) to be welded, and the protective gas is filled into the atmosphere protection box (1) through the first air guide pipe (21) and the second air guide pipe (22); Warm-up phase: When the preheating temperature reaches the set value, the heating device (11) is turned off; Welding stage: The welding gun (5) is started, and the welding current, welding speed and shielding gas flow rate are adjusted according to the welding parameters. The welding gun (5) moves back and forth in the front-to-back direction according to the set weld path to achieve welding of all welds. The movement of the welding gun (5) drives the atmosphere protection cover (2) and the drag cover (3) to move synchronously, ensuring that when the welding gun (5) moves in the through groove, the atmosphere protection cover (2) and the drag cover (3) cover the through groove; at the same time, the first air guide pipe (21) and the second air guide pipe (22) also move synchronously in the front-to-back direction, and the outlet end of the first air guide pipe (21) is kept at the through groove, and the outlet end of the second air guide pipe (22) extends into the atmosphere protection box (1) and is located 12 to 20 mm above the weld; Cooling phase: After welding is completed, the welding gun (5) is turned off, the cooling water flow rate is increased to quickly cool down the test plate (4) to be welded, and it is determined whether the internal temperature of the atmosphere protection box (1) is lower than 150° C. If so, the first air duct (21) and the second air duct (22) are turned off; Cleaning phase: After the test plate (4) to be welded is cooled to room temperature, the atmosphere protection cover (2) and the drag cover (3) are removed, the box cover (15) is opened, the test plate (4) to be welded is taken out for cleaning and inspection, and the atmosphere protection box (1) is cleaned.

9. The method for using the welding atmosphere protection device according to claim 8, characterized in that: During the welding stage, when it is monitored that the temperature inside the atmosphere protection box (1) is higher than 280° C., the flow rate of cooling water in the cooling layer (13) is increased to reduce the temperature.

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