Underwater local dry type laser welding torch sealing drainage system

Abstract

The invention provides an underwater local dry type laser welding torch sealing and drainage system, and relates to the technical field of laser welding torches, according to the underwater local dry type laser welding torch sealing and drainage system, a micro-positive pressure sealing environment is formed through the synergistic effect of a gas supply pipeline, a drainage gas path and a sealing gas path, external water vapor invasion is effectively isolated through inert gas pressure, and the sealing and drainage effects are improved. Meanwhile, the sealing stability is ensured through a multi-stage flow control and real-time monitoring system, and the advantages that water vapor is effectively prevented from invading the interior of the welding torch, and the laser welding quality and the equipment reliability are ensured are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding torches, in particular to an underwater local dry laser welding torch sealing and drainage system. Background Art

[0002] With the country's emphasis on marine development and the increasing use of nuclear facilities, marine equipment and water conservancy facilities, the demand for underwater laser processing has increased, triggering a large amount of research on underwater laser technology. Local dry laser technology is one of the current mainstream research directions of underwater laser technology.

[0003] Water molecules have a high absorption rate for lasers with wavelengths around 1060nm, a common wavelength today. This makes laser welding torches extremely sensitive to water and even ambient humidity. Once water or excessive moisture enters the laser torch, it causes severe heat generation and energy attenuation, and in severe cases, can even burn the lens. This significantly hinders the use of laser welding torches in underwater environments.

[0004] Therefore, how to prevent precision optical lenses from being damaged by the underwater high-pressure environment while providing reliable sealing has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an underwater local dry laser welding torch sealing and drainage system to solve the technical problem in the prior art that water molecules have a high absorption rate for lasers with a common wavelength of around 1060nm. Once water or excessive water vapor enters the laser welding torch, it will cause serious heat and energy attenuation, and in severe cases may even burn the lens.

[0006] In order to achieve the above-mentioned objectives, the present invention provides an underwater local dry laser welding torch sealing and drainage system, comprising an air supply pipeline, a drainage air pipeline and a sealing air pipeline, wherein the air supply pipeline is connected to the inlet of the drainage air pipeline and the inlet of the sealing air pipeline at the same time, the outlet of the drainage air pipeline is connected to the welding torch drainage cover cavity, the outlet of the sealing air pipeline is connected to the welding torch inner cavity, the welding torch inner cavity is connected to the welding torch drainage cover cavity, and the inert gas in the air supply pipeline enables the welding torch inner cavity to form a micro-positive pressure sealing environment.

[0007] Optionally, a drainage switch valve is provided on the drainage gas path, and the drainage switch valve is a normally closed valve port.

[0008] Optionally, a drainage throttle valve is further provided on the drainage gas path. The drainage throttle valve is located at the output end of the drainage switch valve, and the throttling range of the drainage throttle valve is 18~30 L / min.

[0009] Optionally, a drainage flow transmitter is further provided on the drainage gas line, and the drainage flow transmitter is located at the output end of the drainage throttle valve.

[0010] Optionally, a sealing throttle valve and a secondary filter are provided on the sealed air path, and the secondary filter is located at the output end of the sealing throttle valve.

[0011] Optionally, a calibration branch is connected between the sealing throttle valve and the secondary filter, and a micro-pressure one-way valve is provided on the calibration branch.

[0012] Optionally, the end of the calibration branch is a water pressure gauge.

[0013] Optionally, the water pressure scale includes a calibration scale, a calibration slider and a pressure outlet, the calibration slider is slidably arranged on the calibration scale, and the pressure outlet is arranged on the calibration slider.

[0014] Optionally, the throttling flow of the sealing throttle valve is not less than ;

[0015] in: — density of the medium in the external environment, usually water; - acceleration due to gravity; —The internal volume of the torch cavity; - Maximum diving speed during underwater operations; ——Gas source pressure of the gas supply pipeline; ——Head loss in each pipeline and valve port before throttling.

[0016] Optionally, a controller is also included, which is electrically connected to the drain switch valve, drain throttle valve, drain flow transmitter, sealing throttle valve and micro-pressure differential pressure transmitter at the same time; the drain switch valve is used to control the start and stop of the drainage operation, the drain throttle valve is used to adjust the air flow in the drainage hood cavity, the drain flow transmitter is used to monitor the gas flow in the drainage gas circuit in real time, and the micro-pressure differential pressure transmitter is used to monitor the pressure difference inside and outside the inner cavity of the welding torch.

[0017] Optionally, an outer protective lens is provided between the inner cavity of the welding torch and the cavity of the welding torch drainage cover, and a vent hole is punched on the optical lens seat of the inner cavity of the welding torch, connecting the inner cavity of the welding torch divided by the lens into a unified cavity.

[0018] The underwater local dry laser welding torch sealed drainage system provided by the present invention has the following technical effects: This underwater local dry laser welding torch sealing and drainage system forms a micro-positive pressure sealing environment through the synergistic effect of the air supply pipeline, drainage air path and sealing air path, and uses inert gas pressure to effectively isolate the intrusion of external water vapor. At the same time, it ensures the sealing stability through multi-stage flow control and real-time monitoring system. It has the advantages of effectively preventing water vapor from intruding into the welding torch, ensuring the quality of laser welding and equipment reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a structural diagram of a preferred embodiment of the underwater local dry laser welding torch sealing and drainage system of the present invention; Figure 2 yes Figure 1 Detailed diagram of the underwater local dry laser torch sealing drainage system; Figure 3 is with Figure 1 Schematic diagram of the structure of the local dry laser welding torch used in the underwater local dry laser welding torch sealing and drainage system; Figure 4 yes Figure 3 Initial pressure calibration diagram of local dry laser welding torch; Figure 5 yes Figure 4 Pressure calibration diagram of a local dry laser welding torch after adjusting the scale; Figure 6 yes Figure 4 Pressure calibration diagram after adjusting the local dry laser welding torch to increase the water depth.

[0021] in, Figures 1-6 : 1. Gas supply pipeline; 2. Drainage gas line; 21. Drainage on-off valve; 22. Drainage throttle valve; 23. Drainage flow transmitter; 3. Sealed gas circuit; 31. Sealed throttle valve; 32. Secondary filter; 33. Micro-pressure check valve; 34. Micro-pressure differential pressure transmitter; 41. Inner cavity of welding torch; 42. Drain cover cavity of welding torch; 43. Water pressure scale; 431. Calibration scale; 432. Calibration slider; 433. Pressure outlet; 44. External protective lens. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0023] In existing technology, water molecules have a high absorption rate for lasers with a wavelength around 1060nm, a common wavelength today. This makes laser welding torches extremely sensitive to water and even ambient humidity. Once water or excessive moisture enters the laser torch, it causes severe heat generation and energy attenuation, and in severe cases, can even burn the lens. This significantly hinders the use of laser welding torches in underwater environments.

[0024] To address this issue, researchers discovered that existing drainage systems and sealing devices operated independently and did not work together. After numerous tests, they discovered that inert gas diversion control could achieve both drainage and sealing functions.

[0025] Therefore, if Figure 1-3 As shown, the present invention provides a structural schematic diagram of an underwater local dry laser welding torch sealing and drainage system, which includes an air supply pipeline 1, a drainage air pipeline 2 and a sealing air pipeline 3. The input end of the air supply pipeline 1 is connected to the air source, and the output end of the air supply pipeline 1 is simultaneously connected to the inlet of the drainage air pipeline 2 and the inlet of the sealing air pipeline 3. The outlet of the drainage air pipeline 2 is connected to the welding torch drainage cover cavity 42, and the outlet of the sealing air pipeline 3 is connected to the welding torch inner cavity 41. The welding torch inner cavity 41 is connected to the drainage cover cavity. The inert gas in the air supply pipeline 1 causes the welding torch inner cavity 41 to form a micro-positive pressure sealing environment.

[0026] The gas supply line 1 is the main conduit for transporting inert gas, providing a stable gas source to the drain gas line 2 and the sealing gas line 3. The drain gas line 2 is a gas channel connecting the gas supply line 1 with the drain cover, responsible for directing gas into the torch drain cover cavity 42 to form the drain flow. The sealing gas line 3 is a gas channel connecting the gas supply line 1 with the inner cavity 41 of the welding torch, used to continuously supply inert gas to the interior of the welding torch.

[0027] The micro-positive pressure sealing environment is a state in which the pressure in the inner cavity of the welding torch is slightly higher than the external water pressure. Specifically, the pressure difference of 2KPa-10KPa can be achieved through adjustment to prevent external water from seeping in.

[0028] Specifically, the gas supply pipeline 1 divides the inert gas into two routes for transportation. One route enters the welding torch drainage cover cavity 42 through the drainage gas route 2. The inert gas is continuously input to discharge the water in the welding torch drainage cover cavity 42 outward; the other route enters the welding torch inner cavity 41 through the sealed gas route 3. The continuously replenished gas forms pressure in the welding torch inner cavity 41, prompting the welding torch inner cavity 41 to form a micro-positive pressure environment.

[0029] Through the above-mentioned technical solution, the present invention can establish a stable gas barrier in the underwater high-pressure environment, preventing external water from invading the interior of the welding torch and promptly draining accumulated water from the working area. The continuous positive pressure of the sealed gas path 3 effectively prevents water vapor from entering the inner cavity 41 of the welding torch, thereby preventing the generated laser from heating or energy attenuation. The inert gas in the drainage gas path 2 drains moisture from the welding torch drain hood cavity 42, significantly improving the reliability and process stability of underwater laser welding.

[0030] As a preferred embodiment, see Figure 1-Figure 3 As shown, a drainage switch valve 21 is provided on the drainage gas circuit 2, and the drainage switch valve 21 is a normally closed valve port.

[0031] The drainage switch valve 21 is a valve used to control the on-off of the drainage gas path 2, and can be specifically implemented by a solenoid valve. It remains in a closed state under normal conditions to block the flow of gas.

[0032] Specifically, the drain on-off valve 21 is normally closed. When drainage is required, an external control signal triggers the valve to open, allowing the inert gas in the gas supply line 1 to enter the torch drain chamber 42 via the drain gas line 2, thereby draining the water. During the non-draining phase, the drain on-off valve 21 automatically resets to the closed position, preventing external water from seeping back into the torch chamber 41 through the drain gas line 2.

[0033] In addition, a drainage throttle valve 22 is provided on the drainage gas path 2. The drainage throttle valve 22 is located at the output end of the drainage switch valve 21. The throttling range of the drainage throttle valve 22 is 18~30 L / min.

[0034] The drain throttle valve 22 is a valve device used to regulate the flow of inert gas, controlling the gas flow rate by changing the valve opening. The throttling range of 18 to 30 L / min is the gas flow adjustment range. This range is determined by the balance between the gas pressure required by the torch drain chamber 42 and the drainage efficiency.

[0035] Specifically, when the drain on-off valve 21 is opened, inert gas enters the torch drain chamber 42 through the drain throttle valve 22. By adjusting the opening of the drain throttle valve 22, the gas flow rate can be maintained within a preset range, for example, between 18 and 30 L / min. At this flow rate, the gas forms a stable air curtain at the drain chamber outlet, effectively draining surrounding water while preventing destabilization of the slightly positive pressure environment within the torch chamber 41 due to excessive flow.

[0036] A drainage flow transmitter 23 is also provided on the drainage gas line 2 , and the drainage flow transmitter 23 is located at the output end of the drainage throttle valve 22 .

[0037] The drainage flow transmitter 23 is a device for real-time monitoring of the gas flow in the drainage gas line 2. Its function is to provide a data basis for closed-loop control by continuously monitoring the flow changes in the drainage gas line 2.

[0038] Specifically, the drain flow transmitter 23 is installed downstream of the drain throttle valve 22. When the drain on-off valve 21 is open, the inert gas in the gas supply line 1 is regulated by the drain throttle valve 22 and enters the drain hood cavity. At this time, the drain flow transmitter 23 continuously collects gas flow data and transmits it to the controller. If the flow rate deviates from the preset range, the controller will adjust the opening of the drain throttle valve 22 to maintain a dynamic balance between the drain hood cavity and the external water pressure. This process ensures a stable flow in the drain gas line 2 through a real-time feedback mechanism, preventing sudden flow changes that could lead to seal failure or decreased drainage efficiency.

[0039] As a preferred embodiment, Figure 1-3 As shown, the present invention further proposes that a sealing throttle valve 31 and a secondary filter 32 are provided on the sealing gas path 3 , and the secondary filter 32 is located at the output end of the sealing throttle valve 31 .

[0040] The sealing throttle valve 31 is used to regulate the gas flow in the sealed gas path 3, controlling the flow rate by limiting the cross-sectional area of ​​the gas passage. The secondary filter 32 is used to remove solid particles and liquid impurities from the gas, with a filtration accuracy of less than 5 microns.

[0041] Specifically, the inert gas output from the gas supply line 1 is regulated by the sealed throttle valve 31 to form a stable flow, and then enters the secondary filter 32 for purification. This pressure gradient can effectively prevent external water from infiltrating through the welding torch joints.

[0042] In order to make the internal pressure of the torch cavity 41 always slightly higher than the external water pressure, a dynamic balanced micro-positive pressure environment is formed. Figure 1-3As shown, the present invention further proposes a calibration branch connected between the sealed throttle valve 31 and the secondary filter 32, and a micro-pressure check valve 33 is installed on the calibration branch. The end of the calibration branch is a water pressure scale 43, which includes a calibration scale 431, a calibration slider 432, and a pressure outlet 433. The calibration slider 432 is slidably mounted on the calibration scale 431, and the pressure outlet 433 is located on the calibration slider 432.

[0043] The micro-pressure one-way valve 33 is a pre-tightened one-way valve that can be reversely locked without back pressure, and the forward opening pressure is between 2-6 kPa.

[0044] Since the inert gas on the sealed gas path 3 is divided into two paths through the calibration branch, one path flows directly to the inner cavity 41 of the welding torch, and the other path flows to the pressure outlet 433 of the water pressure gauge 43. The gas pressure of the inert gas in the two paths is the same. Therefore, if the air pressure on the calibration branch is dynamically adjusted, the air pressure flowing into the inner cavity 41 of the welding torch will also be adjusted accordingly.

[0045] The following is a detailed description of the pressure adjustment of the inert gas on the calibration branch.

[0046] like Figure 4-6 As shown, calibration slider 432 slides on calibration scale 431 to calibrate the ambient water pressure referenced by the slightly positive pressure within torch cavity 41. This ensures that the torch maintains a slightly positive pressure relative to the outside world at all locations in various operating positions. For example, when calibration slider 432 is in the middle position, the measured ambient pressure is 1.010 MPa, and the pressure after increasing the water depth is 2.010 MPa.

[0047] When the calibration slider 432 is adjusted to move upward according to the working conditions, the measured pressure at this time is 1.015MPa, which is the pressure corresponding to the pressure outlet 433. The sum of the pressure corresponding to the pressure outlet 433 and the pressure reduced by the micro-pressure one-way valve 33 is the pressure of the welding torch inner cavity 41. Therefore, by adjusting the movement of the calibration slider 432 on the calibration scale 431, the pressure of the pressure outlet 433 can be adjusted, and then the pressure of the welding torch inner cavity 41 can be adjusted, so that the internal pressure of the welding torch inner cavity 41 is always slightly higher than the external water pressure, forming a dynamically balanced micro-positive pressure environment, preventing external moisture from invading the interior of the welding torch, and ensuring that the internal and external pressure difference is controllable to avoid pressure on precision optical lenses.

[0048] In some embodiments, the pressure difference of the positive pressure seal can be fine-tuned by adjusting the sealing throttle valve 31 to change the flow through the micro-pressure one-way valve 33 and thereby changing the head loss (air pressure drop) generated by the micro-pressure one-way valve 33.

[0049] Through the above technical solution, the present invention can monitor the balance state between the inner cavity 41 of the welding torch and the external water pressure in real time, and accurately match the actual working conditions by dynamically adjusting the position of the calibration slider 432, effectively preventing water infiltration caused by pressure imbalance, and ensuring the sealing protection of the laser welding torch optical lens in an underwater high-pressure environment.

[0050] The throttling flow of the sealed throttle valve 31 described in this embodiment is not less than the functional relationship formed by the medium density of the external environment, the acceleration of gravity, the internal volume of the welding torch cavity 41, the maximum diving speed during underwater operation, the gas source pressure of the gas supply pipeline 1, and the head loss of each pipeline and valve port before throttling. ;

[0051] in: — density of the medium in the external environment, usually water; - acceleration due to gravity; - the internal volume of the torch cavity 41; - Maximum diving speed during underwater operations; ——Gas source pressure of gas supply pipeline 1; ——Head loss in each pipeline and valve port before throttling.

[0052] Specifically, the lower flow limit of the sealing throttle valve 31 is determined by a functional relationship that integrates the influence of the ambient liquid static pressure, the welding torch speed, and the gas supply conditions. When the welding torch descends rapidly, the maximum descent speed parameter triggers a flow compensation mechanism to prevent pressure imbalance caused by changes in the chamber volume. The combination of gas source pressure and head loss parameters ensures that the throttle valve can still output an effective flow rate despite pipeline pressure drops, preventing seal failure due to insufficient gas supply.

[0053] In some specific embodiments, the functional relationship can be expanded into a combination of product terms and correction terms for each parameter. For example, the medium density, gravitational acceleration, and the square of the maximum diving velocity are used as the dominant terms, and the difference between the air source pressure and the head loss is used as the denominator. During implementation, the controller's built-in algorithm can calculate the target flow rate in real time and adjust the opening of the sealing throttle valve 31 to the corresponding position.

[0054] As a preferred embodiment, it further includes a controller, which is electrically connected to the drain switch valve 21, the drain throttle valve 22, the drain flow transmitter 23, the sealing throttle valve 31 and the micro-pressure differential pressure transmitter 34; the drain switch valve 21 is used to control the start and stop of the drainage operation, the drain throttle valve 22 is used to adjust the air flow in the drainage hood cavity, the drain flow transmitter 23 is used to monitor the gas flow in the drainage gas path 2 in real time, and the micro-pressure differential pressure transmitter 34 is used to monitor the pressure difference inside and outside the welding torch cavity 41.

[0055] The two ends of the micro-pressure differential pressure transmitter 34 of this embodiment are respectively connected to the inner cavity 41 of the welding torch and the water pressure scale 43 to monitor the pressure difference between the inner cavity 41 of the welding torch.

[0056] The controller is an arithmetic unit used to receive sensor signals and output control instructions. It can be implemented using a programmable logic controller or a microprocessor, and coordinated control of various actuators is achieved through preset algorithms.

[0057] Specifically, the controller dynamically adjusts the openings of the drain throttle valve 22 and the sealing throttle valve 31. When the pressure in the torch cavity 41 falls below a set threshold, the controller increases the opening of the sealing throttle valve 31 to increase the inert gas supply. When the pressure differential between the inside and outside of the drain hood exceeds a safe range, the controller adjusts the gas flow through the drain throttle valve 22 to maintain drainage efficiency. The drain on-off valve 21 is triggered by the controller to open or close according to the operation phase, avoiding gas waste.

[0058] As a preferred embodiment, an outer protective lens 44 is provided between the inner cavity 41 of the welding torch and the cavity 42 of the welding torch drainage cover, and a vent is provided on the optical lens seat of the outer protective lens 44 for connecting the inner cavity 41 of the welding torch and the cavity 42 of the welding torch drainage cover, so that the inner cavity 41 of the welding torch and the cavity 42 of the welding torch drainage cover form a unified cavity that is not divided by the lens.

[0059] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An underwater local dry laser welding torch sealing and drainage system, characterized in that: It includes an air supply pipeline, a drainage air pipeline and a sealing air pipeline. The air supply pipeline is connected to the inlet of the drainage air pipeline and the inlet of the sealing air pipeline at the same time. The outlet of the drainage air pipeline is connected to the welding torch drainage cover cavity. The outlet of the sealing air pipeline is connected to the welding torch inner cavity. The welding torch inner cavity is connected to the welding torch drainage cover cavity. The inert gas in the air supply pipeline enables the welding torch inner cavity to form a micro-positive pressure sealed environment.

2. The underwater local dry laser welding torch sealing and drainage system according to claim 1, characterized in that: The drainage gas path is provided with a drainage switch valve, and the drainage switch valve is a normally closed valve port.

3. The underwater local dry laser welding torch sealing and drainage system according to claim 2, characterized in that: A drainage throttle valve is also provided on the drainage gas line, and the drainage throttle valve is located at the output end of the drainage switch valve. The throttling range of the drainage throttle valve is 18~30 L / min. A drainage flow transmitter is also provided on the drainage gas line, and the drainage flow transmitter is located at the output end of the drainage throttle valve.

4. The underwater local dry laser welding torch sealing and drainage system according to claim 2 or 3, characterized in that: The sealed air path is provided with a sealed throttle valve and a secondary filter, and the secondary filter is located at the output end of the sealed throttle valve.

5. The underwater local dry laser welding torch sealing and drainage system according to claim 4, characterized in that: A calibration branch is connected between the sealing throttle valve and the secondary filter, and a micro-pressure one-way valve is provided on the calibration branch.

6. The underwater local dry laser welding torch sealing and drainage system according to claim 5, characterized in that: The end of the calibration branch is a water pressure gauge.

7. The underwater local dry laser welding torch sealing and drainage system according to claim 6, characterized in that: The water pressure scale comprises a calibration scale, a calibration slider and a pressure outlet. The calibration slider is slidably arranged on the calibration scale, and the pressure outlet is arranged on the calibration slider.

8. The underwater local dry laser welding torch sealing and drainage system according to claim 4, characterized in that: The throttling flow of the sealed throttle valve is not less than ; in: — density of the medium in the external environment, usually water; - acceleration due to gravity; —The internal volume of the torch cavity; - Maximum diving speed during underwater operations; ——Gas source pressure of the gas supply pipeline; ——Head loss in each pipeline and valve port before throttling.

9. The underwater local dry laser welding torch sealing and drainage system according to claim 1, characterized in that: It also includes a controller, which is electrically connected to the drain switch valve, drain throttle valve, drain flow transmitter, sealing throttle valve and micro-pressure differential pressure transmitter at the same time; the drain switch valve is used to control the start and stop of the drainage operation, the drain throttle valve is used to adjust the air flow in the drainage hood cavity, the drain flow transmitter is used to monitor the gas flow in the drainage gas circuit in real time, and the micro-pressure differential pressure transmitter is used to monitor the pressure difference inside and outside the inner cavity of the welding torch.

10. The underwater local dry laser welding torch sealing and drainage system according to claim 1, characterized in that: An outer protective lens is provided between the inner cavity of the welding torch and the cavity of the welding torch drainage cover, and a vent hole is punched on the optical lens seat of the inner cavity of the welding torch, connecting the inner cavity of the welding torch divided by the lens into a unified cavity.

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