Gas protection device and method in welding

Abstract

The invention provides a gas protection device and method in welding, and relates to the field of welding. According to the gas protection device and method in welding, the box body, the gas inlet device, the gas exhaust device and the monitoring device are arranged, the gas inlet device, the gas exhaust device and the monitoring device are located on the different side faces of the box body, air on one side of the box body is exhausted through the gas density and the characteristic that air is different, and meanwhile the monitoring device is used for monitoring the oxygen content of gas at the welding position; the welding position is wrapped by the gas with the oxygen content lower than the preset oxygen content value, and therefore the whole welding element is effectively protected. According to the device and the method, the welding quality in the short time of the welding seam can be guaranteed, effective protection can be achieved when the welding seam is long or the two side faces are welded, and meanwhile the device and the method are simple in structure and high in protection gas utilization rate and have high practical value.

Description

Technical Field

[0001] This application relates to the field of welding, and in particular, to a gas protection device and method in welding. Background Art

[0002] During the metal welding process, oxygen or other gases in the atmosphere will react with the high-temperature molten metal, resulting in welding defects such as poor weld quality and appearance, which affect the performance of the welded product. The main purpose of using gas for welding protection is to protect the metal to be welded from contamination by other gases and impurities and ensure the quality of the welded product. In the prior art, the high-temperature position during welding is usually protected by directly blowing gas to the welding position.

[0003] The inventors of this application found that the existing gas protection method is difficult to effectively protect in the case of a long weld or welding two sides, resulting in poor welding effects. Summary of the Invention

[0004] According to the first aspect of this application, a gas protection device in welding is proposed. The device may include:

[0005] A box body, which is a cuboid structure with an open top surface, and a welding groove is provided on the inner bottom surface of the box body;

[0006] An air intake device, which may include an air intake pipe, an air intake port, and an air intake valve; the air intake port is arranged on the first side surface of the box body and is connected to the air intake pipe; the air intake valve is arranged on the air intake pipe; the air intake device can introduce a welding protection gas with a density greater than that of air;

[0007] An exhaust device, which may include at least one exhaust port arranged at the top of the second side surface opposite to the first side surface of the box body, and the distance between the exhaust port and the inner bottom surface is set to be greater than a first height value; the exhaust device is used to discharge the gas in the box body;

[0008] A monitoring device, including a monitoring port, a gas sensor, and a controller. The monitoring port is arranged on the third side surface adjacent to the first side surface of the box body, and the monitoring port, the gas sensor, and the controller are connected in sequence. The gas sensor can detect the oxygen content data of the gas in the box body through the monitoring port, and the controller can control the opening, closing, and adjustment of the air intake flow of the air intake valve according to the oxygen content data;

[0009] Wherein, the first height value is set to the height from the welding groove to the inner bottom surface, the distance between the gas sensor and the inner bottom surface is greater than the first height value, and the distance between the gas sensor and the first side surface is greater than or equal to the distance between the welding groove and the first side surface.

[0010] According to a second aspect of the present application, a gas protection method during welding is proposed. The method may include: introducing a welding protection gas into the box body from the air inlet at a preset first air inlet flow rate, and discharging the original gas in the box body through the air outlet, wherein the density of the welding protection gas is greater than the density of the original gas in the box body; monitoring the oxygen content of the mixed gas at the monitoring port in the box body; starting the welding process when the oxygen content is lower than a preset first threshold, and adjusting the air inlet flow rate of the welding protection gas introduced into the box body to a preset second air inlet flow rate, and continuously monitoring the oxygen content of the mixed gas at the monitoring port; when the oxygen content is higher than a preset second threshold, adjusting the air inlet flow rate of argon introduced into the box body to the first air inlet flow rate, and continuously monitoring the oxygen content of the mixed gas at the monitoring port.

[0011] The gas protection device and method during welding proposed by the present application, by setting a box body and an air inlet device, an air outlet device and a monitoring device located on different sides of the box body, realizes discharging the air on one side of the box body by using the characteristic that the density of the gas is different from that of the air, and at the same time uses the monitoring device to monitor the oxygen content of the gas at the welding position, so as to realize that the welding position is wrapped by the gas with an oxygen content lower than the preset value, thereby realizing the effective protection of the whole welding element. The device and method proposed by the present application can not only ensure the welding quality when the weld is short, but also realize effective protection when the weld is long or welded on both sides. At the same time, the device and method of the present application have a simple structure and a high utilization rate of the protection gas, and have high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without exceeding the scope required to be protected by the present application.

[0013] Figure 1 It is a schematic structural diagram of the gas protection device 1000 during welding of the present application;

[0014] Figure 2 It is a schematic structural diagram of the gas protection device 2000 during welding of the present application;

[0015] Figure 3 It is a schematic structural diagram of the gas protection device 3000 during welding of the present application;

[0016] Figure 4 It is a schematic flow diagram of the gas protection method 4000 during welding of the present application.

[0017] Description of the reference numerals:

[0018] Box body: 100; Inner bottom surface: 101; Welding groove: 1011; First side: 102; Second side: 103;

[0019] Intake device: 200; Intake pipe: 201; Intake port: 202; Intake valve: 203; Exhaust pipe: 204;

[0020] Exhaust device: 300; Exhaust port: 301; Exhaust chamber: 302; Exhaust chamber outlet: 3021; Air extraction device: 303;

[0021] Monitoring device: 400; Monitoring port: 401; Gas sensor: 402; Controller: 403. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0023] Figure 1 It is a schematic structural diagram of the gas protection device 1000 in the welding of the present application. As Figure 1 shown, the device 1000 includes a box body 100, an intake device 200, an exhaust device 300, and a monitoring device 400.

[0024] In some specific embodiments, the device 1000 includes a box body 100, the box body 100 includes an inner bottom surface 101, a first side 102, a second side 103, and a third side 104, where the first side 102 and the second side 103 are opposite, and the third side 104 is adjacent to the first side 102 and the second side 103. In some specific embodiments, the inner bottom surface 101 includes a welding groove 1011. Optionally, in the device 1000, the welding groove 1011 is a profiling tooling structure. Optionally, the welding groove 1011 is detachable, which is convenient for replacing it with different styles of welding groove structures.

[0025] In some specific embodiments, the device 1000 includes an intake device 200, the intake device 200 includes an intake pipe 201, an intake port 202, and an intake valve 203. In some specific embodiments, the intake port 202 is provided on the first side 102 of the box body 100, and the intake port 202 is connected to the intake pipe 201. In the device 1000, the intake valve 203 is provided on the intake pipe 201, and is used to close and open the intake pipe 201, and limit the intake flow rate of the intake pipe 201.

[0026] Optionally, the device 1000 passes a welding protective gas through the intake device 200. Optionally, the density of the welding protective gas is greater than the density of air. Optionally, the welding protective gas is a gas that can protect the metal during welding to avoid oxidation or overheating. Optionally, the welding protective gas is an inert gas, such as argon.

[0027] In some specific embodiments, the device 1000 includes an exhaust device 300, and the exhaust device 300 includes an exhaust port 301. In some specific embodiments, in the device 1000, the number of exhaust ports 301 is at least one, and the distance between the exhaust port 301 and the inner bottom surface 101 is greater than a first height value. In the device 1000, the exhaust device 300 is used to exhaust the gas in the box body 100.

[0028] In some specific embodiments, the device 1000 includes a monitoring device 400, and the monitoring device 400 includes a monitoring port 401, a gas sensor 402, and a controller 403. In the device 1000, the monitoring port 401 is provided on the third side surface 104 of the box body 100.

[0029] In some specific embodiments, the gas sensor 402 is provided at the monitoring port 401, and the controller 403 is connected to the gas sensor 402. In the device 1000, the gas sensor 402 detects the oxygen content data of the gas in the box body 10 through the monitoring port 401. In the device 1000, the controller 403 obtains the oxygen content data monitored by the gas sensor 402 and controls the opening, closing, and adjustment of the intake air flow of the intake valve 203 according to the oxygen content data.

[0030] In some specific embodiments, in the device 1000, the first height value is set to the height from the welding groove 1011 to the inner bottom surface 101. The distance between the gas sensor 402 and the inner bottom surface 101 is greater than the first height value, and the distance between the gas sensor 402 and the first side surface 102 is greater than or equal to the distance between the welding groove 1011 and the first side surface 102.

[0031] The device proposed in this application can not only ensure the welding quality when the weld seam is short, but also effectively protect during welding of long weld seams or welding of both side surfaces. At the same time, the device and method of this application have a simple structure, high utilization rate of the protective gas, and high practical value.

[0032] Figure 2 It is a schematic structural diagram of the gas protection device 2000 during welding of this application. As Figure 2 shown, other parts of the device 2000 are the same as those of the Figure 1 device 1000 and will not be described in detail here. The intake device 200 in the device 2000 further includes a gas release pipeline 204 connected to the intake port 202.

[0033] In some specific embodiments, in the device 2000, the deflation pipeline 204 is located inside the first side surface, and air holes are provided on the deflation pipeline 204. Optionally, the number of air holes on the deflation pipeline 204 is multiple, and the multiple air holes are arranged at intervals. Optionally, the multiple air holes on the deflation pipeline 204 are equally spaced.

[0034] According to the embodiment as Figure 2 shown, the deflation pipeline in the device proposed in this application can make the welding protection gas introduced into the box body more uniform, so that the protection effect is better.

[0035] Figure 3 is a schematic structural diagram of the gas protection device 3000 in the welding of this application. As Figure 3 shown, other parts of the device 3000 are the same as those of the device 1000 in Figure 1 and will not be described herein again.

[0036] In some specific embodiments, as Figure 3 shown, the exhaust device 300 in the device 3000 further includes an exhaust chamber 302 and an exhaust chamber air outlet 3021 provided outside the second side surface 103. In some specific embodiments, the gas in the box body 100 enters the exhaust chamber 302 through the exhaust port 301, and the exhaust chamber 302 stores the discharged gas and discharges it through the exhaust chamber air outlet 3021.

[0037] In some specific embodiments, the exhaust device 300 in the device 3000 further includes an air extraction device 303 connected to the exhaust chamber 302 through the exhaust chamber air outlet 3021. Among them, the air extraction device 303 is used to extract the gas in the exhaust chamber 302. Optionally, in the device 3000, the controller 403 can also control the opening or closing of the air extraction device 3000.

[0038] According to the embodiment as Figure 3 shown, the device proposed in this application caches the gas discharged from the box body through the exhaust chamber and controls the speed of the discharged gas through the air extraction device, which can achieve rapid discharge of the original mixed gas while avoiding discharging the introduced welding protection gas to a certain extent, avoiding waste of the welding protection gas, and improving the efficiency of the welding protection process.

[0039] Figure 4 is a schematic flow diagram of the gas protection method 4000 in the welding of this application. As Figure 4 shown, the method 4000 includes step S401-step S404. In some specific embodiments, the method 4000 is executed by the device described in Figures 1-3 any one of them.

[0040] In some specific embodiments, in step S401, a welding protection gas is introduced into the box body from the air inlet at a preset first air inlet flow rate, and the original gas in the box body is discharged through the exhaust port, wherein the density of the welding protection gas is greater than that of the original gas in the box body. In step S401, the controller controls the opening of the air inlet valve on the air inlet pipeline and introduces the welding protection gas into the box body at the first air inlet flow rate. In step S401, the original gas in the box body is discharged, and the welding protection gas is deposited at the bottom of the box body.

[0041] In some specific embodiments, in step S402, the oxygen content of the mixed gas in the box body at the monitoring port is monitored. In some specific embodiments, an oxygen sensor monitors the oxygen content of the mixed gas in the box body at the monitoring port, and at this time, the oxygen content at the monitoring port can represent the oxygen content of the gas within the range covering the welding groove. In some specific embodiments, in step S402, the introduction of the welding protection gas and the discharge of the original gas in the box body continue, and the oxygen sensor continuously monitors the oxygen content of the gas in the box body.

[0042] In some specific embodiments, in step S403, when the oxygen content is lower than a preset first threshold, the welding process is started, and the air inlet flow rate of the welding protection gas introduced into the box body is adjusted to a preset second air inlet flow rate, and the oxygen content of the mixed gas at the monitoring port is continuously monitored. In step S403, the first threshold is the oxygen content value that enables effective protection during the welding process.

[0043] Optionally, the first threshold is adjusted according to specific welding scenarios such as the type of metal being welded. In some specific embodiments, when the oxygen content is lower than the preset first threshold, it indicates that the welding groove is in a gas environment where effective protection can be obtained. In step S403, the welding process is started and the introduction speed of the welding protection gas is adjusted to the second air inlet flow rate. In some specific embodiments, in step S404, when the oxygen content is higher than a preset second threshold, the air inlet flow rate of argon introduced into the box body is adjusted to the first air inlet flow rate, and the oxygen content of the mixed gas at the monitoring port is continuously monitored.

[0044] In method 4000, the first air inlet flow rate of the welding protection gas introduced at the beginning is greater than the second air inlet flow rate. The reason is that before the welding starts, the proportion of air in the box body is relatively large, and it is necessary to quickly make the gas environment of the welding groove reach the first threshold for welding. After the welding starts, the gas environment in the box body is relatively stable. At this time, a relatively fast flow rate is not required, and only by maintaining the current gas composition can the welding process be protected.

[0045] In method 4000, when the gas sensor detects that the oxygen content is higher than a preset second threshold, the intake gas flow rate is adjusted to the first intake gas flow rate because: at this time, the gas environment in the welding tank cannot achieve a protective effect, and it is necessary to quickly reduce the oxygen content in the gas.

[0046] According to the embodiment as Figure 4 shown, the method proposed in this application enables the welding area to always be in a gas environment that can provide protection during the welding process by introducing welding protection gas on one side of the box body, exhausting gas on the other side, and real-time monitoring of the oxygen content in the box body, effectively ensuring the welding quality.

Claims

1. A gas protection device during welding, characterized in that, Comprising: A box body, which is a cuboid structure with an open top surface, and a welding groove is provided on the inner bottom surface of the box body; An air inlet device, including an air inlet pipe, an air inlet and an air inlet valve; the air inlet is arranged on the first side surface of the box body and is connected to the air inlet pipe; the air inlet valve is arranged on the air inlet pipe; the air inlet device can introduce a welding protection gas with a density greater than that of air; An exhaust device, including at least one exhaust port arranged at the top of the second side surface opposite to the first side surface of the box body, and the distance between the exhaust port and the inner bottom surface is set to be greater than a first height value; the exhaust device is used for exhausting the gas in the box body; A monitoring device, including a monitoring port, a gas sensor and a controller, the monitoring port is arranged on the third side surface adjacent to the first side surface of the box body, the monitoring port, the gas sensor and the controller are connected in sequence, the gas sensor can detect the oxygen content data of the gas in the box body through the monitoring port, and the controller can control the opening, closing and adjustment of the air inlet flow rate of the air inlet valve according to the oxygen content data; Wherein, the first height value is set to be the height from the welding groove to the inner bottom surface, the distance between the gas sensor and the inner bottom surface is greater than the first height value, and the distance between the gas sensor and the first side surface is greater than or equal to the distance between the welding groove and the first side surface.

2. The device according to claim 1, characterized in that, The welding groove includes a profiling tooling structure.

3. The device according to claim 1, characterized in that, The welding groove is set to be detachable.

4. The device according to claim 1, characterized in that, The air inlet device further includes a gas release pipe connected to the air inlet, the gas release pipe is located inside the first side surface, and the gas release pipe is provided with air holes.

5. The device according to claim 4, characterized in that, The number of the air holes is multiple, and the multiple air holes are arranged at intervals.

6. The device according to claim 1, characterized in that, The at least one exhaust port is set to be a rectangle or a rounded rectangle with a total length equal to the length of the top of the second side surface.

7. The device according to any one of claims 1-6, characterized in that, The exhaust device further includes an exhaust chamber arranged outside the second side surface, the exhaust chamber can store the gas discharged from the box body through the exhaust port, and the exhaust chamber includes an exhaust chamber air outlet.

8. The device according to claim 7, characterized in that, The exhaust device further includes an air extraction device connected to the exhaust chamber through the exhaust chamber air outlet.

9. The device according to claim 8, characterized in that, The controller is set to be further capable of controlling the opening or closing of the air extraction device.

10. A gas protection method during welding, applied to the device according to any one of claims 1-9, characterized in that, Comprising: Introduce a welding protection gas into the box body from the air inlet at a preset first air inlet flow rate, and discharge the original gas in the box body through the exhaust port, wherein the density of the welding protection gas is greater than the density of the original gas in the box body; Monitor the oxygen content of the mixed gas in the box body at the monitoring port; In the case where the oxygen content is lower than a preset first threshold, start the welding process, and adjust the air inlet flow rate of the welding protection gas introduced into the box body to a preset second air inlet flow rate, and continue to monitor the oxygen content of the mixed gas at the monitoring port; In the case where the oxygen content is higher than a preset second threshold, adjust the air inlet flow rate of argon introduced into the box body to the first air inlet flow rate, and continue to monitor the oxygen content of the mixed gas at the monitoring port.

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