A gas-saving device for welding shielding gas

Abstract

This invention discloses a gas-saving device for welding shielding gas, relating to the technical field of shielding gas saving. The device includes a gas-saving apparatus with internal fluid pipelines and control components. The control components first drive a baffle within the fluid pipeline to move based on the obtained weld width data, thereby obtaining the maximum flow rate for that weld width. The maximum fluid flow rate for welding at that weld width is determined first, allowing for targeted fluid flow rate adjustments based on different weld widths, achieving initial gas saving while ensuring adequate shielding gas coverage. Further gas saving is achieved by dynamically adjusting the rotation angle of a dynamic adjustment plate according to a proportional ratio. Based on real-time changes in welding current, the gas flow rate is intelligently controlled, and the gas is specially treated before supplying it without altering the gas formula. This effectively reduces gas consumption while ensuring welding quality.

Description

Technical Field

[0001] This invention relates to the field of gas conservation technology, and in particular to a gas conservation device for welding protective gas. Background Technology

[0002] During welding, the use of shielding gas prevents the high-temperature molten pool from oxidizing, thus improving weld quality. If the shielding gas flow rate is too low, it will not provide adequate protection; if the flow rate is too high, it will affect the stability of the arc. Therefore, the shielding gas flow rate needs to be frequently adjusted according to the working conditions. In the current field of welding robots, the shielding gas is output from a gas source, passes through a gas pipe to the wire feeder, and then through a cable to the welding robot, forming a complete structure. During welding, the gas flow rate is adjusted manually by the worker by adjusting the knob of the gas valve at the gas source. The automatic welding gas flow rate adjustment device of this invention aims to achieve automatic gas flow rate adjustment. Sometimes, during welding, it is necessary to automatically adjust the welding shielding gas flow rate online according to the welding quality and welding conditions. Therefore, researching an automatic welding shielding gas flow rate adjustment device helps to achieve welding automation, improve welding quality, and generate significant economic benefits.

[0003] Traditional gas shielded welding typically involves six stages: pre-gas, arc initiation, arc climbing, welding, arc termination, and gas extension. Without a gas-saving device, the gas flow rate is fixed in these six stages. Furthermore, when welding different weld widths, there is no corresponding gas flow rate set for each weld width. Operators rely on the maximum gas flow rate during welding, leading to a waste of shielding gas. Summary of the Invention

[0004] The purpose of this invention is to provide a gas-saving device for welding shielding gas. It features a pre-determined maximum fluid flow rate for welding at a weld width, allowing for targeted flow rate adjustments based on different weld widths, thus achieving initial gas saving while ensuring adequate shielding gas coverage. Further gas saving is achieved by dynamically adjusting the rotation angle of a dynamic regulating plate according to a proportional ratio. The gas flow rate is intelligently controlled based on real-time changes in welding current, and the gas is specially treated before supplying it without altering the gas formula. This device effectively reduces gas consumption while ensuring welding quality.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a gas-saving device for welding shielding gas, comprising:

[0006] The welding power source has wires that are split into two paths by a current sensor. One path is connected to the welding robot, and the other path is connected to the gas-saving device. A welding circuit is formed between the welding power source and the welding robot. The current sensor detects the current value of the welding circuit and transmits it to the gas-saving device.

[0007] The detector is used to detect the seam width of the workpiece to be welded and upload the seam width data to the gas-saving device;

[0008] The gas-saving device has internal fluid pipelines and control components. The control components first drive the baffle in the fluid pipeline to move based on the obtained seam width data to obtain the maximum flow rate for welding that seam width. Then, based on the obtained welding current value, the angle of the dynamic adjustment plate on the baffle is changed to match the fluid flow rate in the fluid pipeline with the welding current. The flow rate in the fluid pipeline is further controlled according to the current magnitude.

[0009] The inlet of the fluid pipeline is connected to the outlet of the gas source, and the outlet of the fluid pipeline is connected to the welding robot via a pipe.

[0010] As an optional implementation, the current sensor includes one or more of a current clamp, a current detector, and a multimeter.

[0011] As an optional implementation, the detector includes one or more of the following: a single-probe parallel light width meter, a dual-probe parallel light width meter, a wide-angle probe width meter, a laser width meter, and a binocular vision width meter.

[0012] As an optional implementation, the fluid pipeline is connected to the control component, and the airflow channel inside the control component is connected to the fluid pipeline. The control component is equipped with a power structure for driving the baffle to move and a speed-changing structure for driving the dynamic adjustment plate to move.

[0013] As an optional implementation, the power structure includes a cylinder and a telescopic rod. The telescopic rod connected to the cylinder is connected to a baffle. A control unit that accommodates the baffle is provided on the fluid pipeline. The cylinder is mounted on the control unit, and the cylinder adjusts the position of the baffle by the gap width.

[0014] As an optional implementation, the top of the dynamic adjustment plate is provided with a protrusion, and the rotating shafts connected to both ends of the protrusion pass through the bracket, and the bracket is mounted on one side of the baffle.

[0015] As an optional implementation, the speed change structure includes a first adjusting plate, a second adjusting plate, a miniature cylinder, a cylinder rod, and a positioning shaft, with the positioning shaft hinged between the first adjusting plate and the second adjusting plate.

[0016] The positioning shaft is hinged to the top of the miniature cylinder, and the cylinder rod on the miniature cylinder is hinged to the movable slider on the dynamic adjustment plate.

[0017] As an optional implementation, the side of the baffle is provided with staggered upper and lower baffles, which abut against the upper and lower surfaces of the dynamic adjustment plate.

[0018] As an optional implementation, the extension length of the miniature cylinder is inversely proportional to the magnitude of the welding current, and the extension length of the cylinder is inversely proportional to the weld width.

[0019] The technical effects and advantages of this invention are as follows:

[0020] 1. First determine the maximum fluid flow rate for welding based on the weld width. This allows for targeted adjustment of the fluid flow rate according to different weld widths, achieving initial gas saving while ensuring adequate coverage of the protective gas.

[0021] 2. When facing wide and narrow weld seams, under the same welding current, the cylinder rod extends to the same length, but the rotation angle of the dynamic adjustment plate differs. This allows for adjustment of the baffle height according to different weld seams, proportionally adjusting the rotation angle of the dynamic adjustment plate. Specifically, for wide weld seams, under the same welding current, the dynamic adjustment plate adjusts to a larger angle, while for narrow weld seams, under the same welding current, the dynamic adjustment plate adjusts to a smaller angle, achieving dynamic flow adjustment and further saving gas. Based on real-time changes in the welding current, the gas flow rate is intelligently controlled, and the gas is specially treated before supplying it without altering the gas formula. This ensures welding quality while effectively reducing gas consumption. Attached Figure Description

[0022] Figure 1 This is a diagram showing the gas-saving device connected to the robot and the gas source structure of the present invention;

[0023] Figure 2 This is a diagram showing the connection between the internal fluid pipelines and control components and control unit of the gas-saving device of the present invention;

[0024] Figure 3 This is a structural diagram of the left side of the internal structure of the control component of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged view of point A;

[0026] Figure 5 This is a structural diagram of the control component on the right side of the present invention;

[0027] Figure 6 For the present invention Figure 5 Enlarged view of point B;

[0028] Figure 7 This is a schematic diagram comparing the lifting positions of the wide and narrow slot baffles of the present invention;

[0029] Figure 8 This is a schematic diagram of the cylinder rod of the present invention moving on the dynamic adjustment plate to adjust the rotation angle of the dynamic adjustment plate.

[0030] In the picture:

[0031] 1. Welding power source;

[0032] 2. Current sensor;

[0033] 3. Detector;

[0034] 4. Energy-saving equipment;

[0035] 41. Fluid piping; 42. Control components; 43. Baffle; 44. Dynamic adjustment plate; 441. Protrusion;

[0036] 5. Control Department;

[0037] 6. Bracket;

[0038] 71. Positioning shaft; 72. Adjusting plate one; 73. Adjusting plate two; 74. Miniature cylinder; 75. Cylinder rod;

[0039] 8. Upper retaining strip;

[0040] 9. Lower stop bar. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Before describing the embodiments of this application, to facilitate understanding of the technical solutions of this application, the basic concepts and terms involved in the embodiments of this application will be explained:

[0043] The welding process is normally divided into 6 stages: pre-gas, arc initiation, climbing, welding, arc termination, and gas extension. Without a gas-saving device, the gas flow rate is fixed in these 6 stages, but the actual process requirements for the gas flow rate in the pre-gas, climbing, arc termination, and gas extension stages can be reduced.

[0044] 1. Pre-welding gas stage: The main purpose is to establish a protective atmosphere before welding. At this stage, the arc has not yet started, and the gas flow rate can be appropriately reduced, but it is necessary to ensure that a stable protective layer is established in advance.

[0045] 2. Arc ignition stage: Arc ignition refers to the action of starting to generate a high-frequency electric arc in argon arc welding;

[0046] 3. Ramp-up phase: The welding current or energy gradually increases, which may require dynamic adjustment of the gas flow rate;

[0047] 4. Welding stage: The welding current reaches its maximum, and the shielding gas flow rate reaches its maximum value at the same time;

[0048] 5. Arc termination stage: When welding ends, the welding current is gradually reduced to zero, and the molten pool gradually cools down, but shielding gas still needs to be introduced for protection.

[0049] 6. Continuing gas supply stage: Continue to supply protective gas until the weld is completely cooled.

[0050] Furthermore, the required gas flow rate varies depending on the weld width. The table below shows the gas flow rate corresponding to the weld width.

[0051] Weld width (mm) Typical molten pool length (mm) <![CDATA[Gas covering required area (cm 2 )]]> 3 8-12 2.4-3.6 6 15-20 9.0-12.0 10 25-35 25-35

[0052] The following are specific instructions for gas-saving protection at different weld widths and stages, enabling dynamic gas control across multiple weld widths and stages, and dynamically adjusting the gas flow rate to achieve the gas-saving function of welding shielding gas.

[0053] See Figures 1-4 To achieve the above objectives, the present invention provides the following technical solution: a gas-saving device for welding shielding gas, comprising:

[0054] The welding power source 1 has a wire that is split into two paths by the current sensor 2. One path is connected to the welding robot, and the other path is connected to the gas-saving device 4. The welding power source 1 and the welding robot form a welding circuit. The current sensor 2 detects the current value of the welding circuit and transmits it to the gas-saving device 4.

[0055] The gas-saving device 4 has a fluid pipeline 41 and a control component 42 inside. The control component 42 first drives the baffle 43 inside the fluid pipeline 41 to move based on the obtained weld width data, so as to obtain the maximum flow rate for welding that weld width.

[0056] Detector 3 is used to detect the seam width of the workpiece to be welded and upload the seam width data to the gas-saving device 4;

[0057] Among them, as a gas-saving device for welding shielding gas, the detector 3 includes one or more of the following: a single-probe parallel light width gauge, a dual-probe parallel light width gauge, a wide-angle probe width gauge, a laser width gauge, and a binocular vision width gauge.

[0058] Taking a laser rangefinder as an example: a high-precision laser rangefinder sensor is used to project a laser beam onto the surface of the object to be welded, and the width of the plate is determined by receiving the reflected light and calculating the position change of the light spot.

[0059] Before welding and ventilating, the weld width is measured by detector 3 and the measured data is uploaded to the gas-saving device 4. Then, according to different weld widths, the position of baffle 43 is changed, so that the maximum fluid flow rate that the fluid pipeline 41 can pass through under the measured weld width is determined first.

[0060] By determining the maximum fluid flow rate through the above steps, it is ensured that the shielding gas can completely cover the weld during the welding process.

[0061] As the molten droplets are generated, developed, and transitioned, the arc resistance of the welding arc changes accordingly. Naturally, the welding current also changes on a microscopic time scale. The welding shielding gas has a real-time resistive heat power P = 1 / 2R, and as the arc heat changes, the amount of welding shielding gas constituting the arc does not need to be a constant value and can also change accordingly.

[0062] Among them, as a gas-saving device for welding shielding gas, the current sensor 2 includes one or more of the following: current clamp, current detector, and multimeter.

[0063] The current sensor 2 detects the welding current on the welding circuit using one or more methods, such as a current clamp, a current detector, or a multimeter. The obtained welding current value changes the angle of the dynamic adjustment plate 44 on the baffle 43, so that the fluid flow rate in the fluid pipeline 41 matches the welding current, and the flow rate in the fluid pipeline 41 is further controlled according to the current magnitude.

[0064] The dynamic adjustment plate 44 optimizes the relationship between welding current and shielding gas flow. The built-in database optimizes welding quality through voltage stabilization while collecting welding current in real time and dynamically adjusting the gas supply. This effectively reduces gas consumption while ensuring the protection of the molten pool.

[0065] The inlet end of the fluid pipeline 41 is connected to the outlet end of the gas source, and the outlet end of the fluid pipeline 41 is connected to the welding robot through a pipe.

[0066] The gas from the gas source flows into the welding robot through the fluid pipeline 41. During the pre-gas stage, the climbing stage, the arc-ending stage, and the gas-delaying stage, the flow rate in the fluid pipeline 41 is further controlled by the magnitude of the welding current, thereby achieving multi-stage dynamic gas regulation and dynamically adjusting the gas flow rate.

[0067] Gas flow rate is synchronized with welding current: During the welding process, the intelligent gas-saving device adjusts the total amount of protective gas to the real-time demand and ensures that excess welding protective gas is reserved.

[0068] The following is a detailed structural description of the function to adjust the maximum flow rate based on the weld seam:

[0069] The fluid pipeline 41 is connected to the control component 42. The airflow channel inside the control component 42 is connected to the fluid pipeline 41. The control component 42 is equipped with a power structure that drives the baffle 43 to move.

[0070] The power structure includes a cylinder and a telescopic rod. The telescopic rod connected to the cylinder is connected to a baffle 43. A control part 5 is provided on the fluid pipeline 41 to accommodate the baffle 43. The cylinder is mounted on the control part 5. The cylinder adjusts the position of the baffle 43 by the gap width dimension.

[0071] The extension length of the cylinder is inversely proportional to the width of the slit. The wider the slit, the shorter the extension length of the cylinder, and the baffle 43 rises to increase the fluid flow rate of the fluid pipeline 41. Conversely, the narrower the slit, the longer the extension length of the cylinder, and the baffle 43 descends to reduce the fluid flow rate of the fluid pipeline 41.

[0072] By first determining the maximum fluid flow rate for welding at the weld width, the fluid flow rate can be adjusted accordingly for different weld widths, achieving the initial purpose of saving gas while ensuring the coverage of the protective gas.

[0073] The control unit 42 is equipped with a speed-changing structure that drives the dynamic adjustment plate 44 to move. This speed-changing structure allows the dynamic adjustment plate 44 to adjust its position in real time. Based on the changes in welding current, different stages are determined, and the flow rate is adjusted according to different stages to achieve the purpose of saving gas.

[0074] See Figure 4 The top of the dynamic adjustment plate 44 is provided with a protrusion 441, and the rotating shafts connected to both ends of the protrusion 441 pass through the bracket 6, and the bracket 6 is mounted on one side of the baffle 43.

[0075] The protrusion 441 can rotate around the bracket 6 via a pivot, thereby adjusting the angle of the dynamic adjustment plate 44 to further control the gas flow rate in the fluid pipeline 41;

[0076] See Figure 5 and Figure 6 The speed change structure includes an adjustment plate 72, an adjustment plate 73, a miniature cylinder 74, a cylinder rod 75, and a positioning shaft 71. The positioning shaft 71 is hinged between the adjustment plate 72 and the adjustment plate 73. The positioning shaft 71 is hinged to the top of the miniature cylinder 74, and the cylinder rod 75 on the miniature cylinder 74 is hinged to the movable slider on the dynamic adjustment plate 44.

[0077] The movable slider can be connected to the cylinder, linear guide rail or lead screw on the dynamic adjustment plate 44. During the lifting and lowering of the baffle 43, the cylinder rod 75 adjusts the extension distance of the cylinder rod 75 under the reciprocating movement of the movable slider, thereby changing the position of the connection between the dynamic adjustment plate 44 and the cylinder rod 75.

[0078] The side of the baffle 43 is provided with an upper baffle 8 and a lower baffle 9 that extend in an alternating manner, and the upper baffle 8 and the lower baffle 9 abut against the upper and lower surfaces of the dynamic adjustment plate 44 in an alternating manner.

[0079] The structure that drives the upper stop bar 8 and the lower stop bar 9 to extend alternately is placed inside the baffle 43. There are many structures that drive the upper stop bar 8 and the lower stop bar 9 to rise and fall alternately. This embodiment provides a hinged connecting rod structure between the upper stop bar 8 and the lower stop bar 9. The middle part of the connecting rod rotates around the fulcrum inside the baffle 43. The upper stop bar 8 is connected to an electromagnetic structure, that is, a magnetic sheet is connected to the side of the upper stop bar 8, and an energized coil is wound on the iron core. An insulating spring is connected between the upper stop bar 8 and the iron core. That is, when the baffle 43 descends, the energized coil is de-energized, and the insulating spring rebounds, pushing the upper stop bar 8 out of the baffle 43 and against the upper surface of the dynamic adjustment plate 44. The lower stop bar 9 retracts into the baffle 43. When the baffle 43 rises, the energized coil is energized and attracts the upper stop bar 8 to retract into the baffle 43, while the lower stop bar 9 extends out of the baffle 43 and against the lower surface of the dynamic adjustment plate 44.

[0080] As the baffle 43 moves up or down according to the seam width data, the dynamic adjustment plate 44 remains horizontal.

[0081] The following is a detailed structural description of adjusting the fluid flow rate according to the welding current:

[0082] The lifting and lowering process of baffle 43 is a detection process, during which the protective gas has not yet been introduced into the fluid pipeline 41. This occurs during the lifting and lowering of baffle 43.

[0083] As shown in Figure 7, when a narrow gap is detected, the flow rate of the protective gas needs to be reduced. The cylinder drives the baffle 43 to descend. During the descent of the baffle 43, the upper baffle 8 extends and abuts against the upper surface of the dynamic adjustment plate 44. As the dynamic adjustment plate 44 descends with the baffle 43, the cylinder rod 75 is extended by the micro cylinder 74. This keeps the dynamic adjustment plate 44 horizontal during the descent and also changes the position of the connection between the cylinder rod 75 and the dynamic adjustment plate 44.

[0084] The extension length of the miniature cylinder 74 is inversely proportional to the magnitude of the welding current. That is, when the welding current is low, it can be known that the non-welding state is in which the cylinder rod 75 of the miniature cylinder 74 extends, allowing the dynamic adjustment plate 44 to rotate downward and the rotation angle to increase, so as to reduce its gas flow. Conversely, when the welding current is increased, the cylinder rod 75 shortens, the dynamic adjustment plate 44 moves upward and rotates to a horizontal position where it is blocked by the upper stop bar 8.

[0085] The purpose of changing the connection position of the cylinder rod 75 and the dynamic adjustment plate 44 is that, since the position of the baffle 43 is changed for different weld widths, the diameter of the fluid pipeline 41 also changes in real time. Therefore, for different weld widths, if the positions of the cylinder rod 75 and the dynamic adjustment plate 44 do not change, then for welds of different sizes, the extension length of the cylinder rod 75 is the same, which will make the rotation angle of the dynamic adjustment plate 44 consistent.

[0086] The angles of the dynamic adjustment plates 44 are the same, which causes the diameter of the fluid pipe 41 to become smaller in the narrow gap state, resulting in a decrease in the flow rate of the shielding gas, which may affect the gas supply in multiple stages and affect the welding quality.

[0087] To address the aforementioned issues, this structure incorporates a variable connection point for the slider.

[0088] like Figure 8 As shown, when facing both wide and narrow seams, under the same welding current change, the extension length of the cylinder rod 75 is the same, where the extension length of the cylinder rod 75 is H, and the rotation angle of the dynamic adjustment plate 44 is β. The horizontal distance between the dynamic adjustment plate 44 and the connection point of the cylinder rod 75 before and after rotation is set to M. Since the length of H is limited, the larger M is, the larger the value of cosβ is, and the smaller the angle β is. By changing the angle between the dynamic adjustment plate 44 and the cylinder rod 75, the rotation angle β of the dynamic adjustment plate 44 is changed.

[0089] The height of the baffle 43 can be adjusted according to different weld seams, and the rotation angle of the dynamic adjustment plate 44 can be adjusted proportionally. That is, when facing a wide weld seam, the adjustment angle of the dynamic adjustment plate 44 is larger under the same welding current, while when facing a narrow weld seam, the adjustment angle of the dynamic adjustment plate 44 is smaller under the same welding current, thus realizing dynamic adjustment of the flow rate.

[0090] The above-mentioned structure can keep the dynamic adjustment plate 44 in a horizontal state during the lifting and lowering process of the baffle 43, and can also dynamically adjust the flow rate of the fluid pipeline 41 according to different welding conditions.

[0091] Based on real-time changes in welding current, the gas flow rate is intelligently controlled, and the gas is specially treated before supplying it without changing the gas formula, thus ensuring welding quality while effectively reducing gas consumption.

[0092] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas-saving device for welding shielding gas, characterized in that, include: The welding power source (1) has wires that are split into two paths by the current sensor (2). One path is connected to the welding robot, and the other path is connected to the gas-saving device (4). A welding circuit is formed between the welding power source (1) and the welding robot. The current sensor (2) detects the current value of the welding circuit and transmits it to the gas-saving device (4). The detector (3) is used to detect the seam width of the workpiece to be welded and upload the seam width data to the gas-saving device (4). The gas-saving device (4) has a fluid pipeline (41) and a control component (42) inside. The control component (42) first drives the baffle (43) in the fluid pipeline (41) to move by obtaining the seam width data to obtain the maximum flow rate for welding the seam width. Then, it changes the angle of the dynamic adjustment plate (44) on the baffle (43) by obtaining the welding current value so that the fluid flow rate in the fluid pipeline (41) matches the welding current. The flow rate in the fluid pipeline (41) is further controlled according to the current magnitude. The inlet end of the fluid pipeline (41) is connected to the outlet end of the gas source, and the outlet end of the fluid pipeline (41) is connected to the welding robot through a pipe.

2. The gas-saving device for welding shielding gas according to claim 1, characterized in that, The current sensor (2) includes one or more of the following: current clamp, current detector, and multimeter.

3. The gas-saving device for welding shielding gas according to claim 1, characterized in that, The detector (3) includes one or more of the following: single-probe parallel light width meter, dual-probe parallel light width meter, wide-angle probe width meter, laser width meter, and binocular vision width meter.

4. The gas-saving device for welding shielding gas according to claim 1, characterized in that, The fluid pipeline (41) is connected to the control unit (42). The airflow channel inside the control unit (42) is connected to the fluid pipeline (41). The control unit (42) is equipped with a power structure for driving the baffle (43) to move and a speed-changing structure for driving the dynamic adjustment plate (44) to move.

5. A gas-saving device for welding shielding gas according to claim 4, characterized in that, The power structure includes a cylinder and a telescopic rod. The telescopic rod connected to the cylinder is connected to a baffle (43). A control unit (5) for accommodating the baffle (43) is provided on the fluid pipeline (41). The cylinder is mounted on the control unit (5). The cylinder adjusts the position of the baffle (43) by the gap width dimension.

6. A gas-saving device for welding shielding gas according to claim 5, characterized in that, The top of the dynamic adjustment plate (44) is provided with a protrusion (441), and the rotating shafts connected to both ends of the protrusion (441) pass through the bracket (6), and the bracket (6) is mounted on one side of the baffle (43).

7. A gas-saving device for welding shielding gas according to claim 6, characterized in that, The speed change structure includes a positioning shaft (71), an adjusting plate one (72), an adjusting plate two (73), a miniature cylinder (74), and a cylinder rod (75). The adjusting plate one (72) and the adjusting plate two (73) are fixed on the baffle (43), and the positioning shaft (71) is hinged between the adjusting plate one (72) and the adjusting plate two (73). The positioning shaft (71) is hinged to the top of the micro cylinder (74), and the cylinder rod (75) on the micro cylinder (74) is hinged to the movable slider on the dynamic adjustment plate (44).

8. A gas-saving device for welding shielding gas according to claim 7, characterized in that, The side of the baffle (43) is provided with an upper baffle (8) and a lower baffle (9) that extend in an alternating manner, and the upper baffle (8) and the lower baffle (9) abut against the upper and lower surfaces of the dynamic adjustment plate (44) in an alternating manner.

9. A gas-saving device for welding shielding gas according to claim 7, characterized in that, The extension length of the miniature cylinder (74) is inversely proportional to the magnitude of the welding current, and the extension length of the cylinder is inversely proportional to the weld width.

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