Laser welding assembly

Abstract

The invention relates to the technical field of laser welding, and discloses a laser welding assembly which comprises a main body piece, balls are installed at the bottom of the main body piece, a pressing ring used for synchronously displacing with the balls is arranged at the tops of the balls, and a limiting mechanism used for limiting the displacement amount of the balls is installed at the bottom of the inner wall of the main body piece; the air inlet pipe is used for guiding air into the main body piece, and an air conveying assembly used for limiting the air flow is arranged in the air inlet pipe; the distance measuring assembly is located in the middle of the outer wall of the body piece and used for detecting the displacement distance of the pressing ring. The control system is used for adjusting the gas flow of the gas conveying assembly according to the distance between the pressing ring and the welding piece. The distance measuring assembly is used for detecting the displacement distance of the pressing ring and the ball, the control system is used for adjusting the gas flow of the gas conveying assembly, and therefore when the surface of a welding part is uneven, the ball can be stably located in the limiting mechanism by adjusting the extrusion force of the gas flow on the ball, and the situation that the welding quality is affected due to friction of the ball is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding, in particular to a laser welding assembly. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. It is mainly used for welding thin-walled materials and low-speed welding. The welding process is a heat conduction type, that is, the laser radiation heats the workpiece surface, and the surface heat diffuses to the inside through heat conduction. By controlling the laser pulse width, energy, peak power, repetition frequency and other parameters, the workpiece is melted to form a specific molten pool. Due to its unique advantages, it has been successfully used in the precision welding of micro and small parts.

[0003] In the structure of liquid flow battery stacks, laser welding technology is applied in the production and processing of parts, mainly in the welding and assembly of the guide frame plate and the bipolar plate, as well as the assembly of the packaging plate of the entire stack. A certain amount of pressure is applied during the welding process to make the welding joint close to the part to be welded to complete the welding. However, the applied pressure is limited by the equipment, and the pressure is uneven, resulting in uneven friction when the welding head moves on the welding surface, which may cause scratches on the parts to be welded or cold welds at the welds, affecting the welding quality, and further affecting the quality of the liquid flow battery stack. During operation, electrolyte leakage may occur, and in severe cases, the stack may short-circuit.

[0004] However, during the use of existing laser welding assemblies, the airflow impacts the ball to suspend it and press the welded parts, but the airflow size is inconvenient to adjust. When the airflow is large or small, the ball will lose its suspension state, and then the ball will rub against the parts, causing damage to the ball and affecting the welding quality. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a laser welding assembly, which solves the problem in the prior art that the airflow size is inconvenient to adjust, which causes the ball to lose its suspension state, causes friction between the ball and the component, and causes damage to the ball, affecting the welding quality.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A laser welding assembly, comprising:

[0007] A main body, a ball is installed at the bottom, a pressure ring for synchronous displacement with the ball is arranged on the top of the ball, and a limit mechanism for limiting the displacement of the ball is installed at the bottom of the inner wall of the main body;

[0008] An air inlet pipe, located at the top of the right side of the main body, is used to guide the gas into the main body, and a gas delivery component for limiting the gas flow is arranged in the air inlet pipe;

[0009] A distance measuring component, which is located in the middle of the outer wall of the main body and is used to detect the displacement distance of the pressure ring;

[0010] The control system is located outside the air inlet pipe and is electrically connected to the distance measuring component and the gas delivery component, and is used to adjust the gas flow of the gas delivery component according to the distance between the pressure ring and the welding part.

[0011] Preferably, the limiting mechanism includes a support ring, which is located on the bottom surface of the main body, and a plurality of lower limit blocks are fixedly connected to the inner wall of the support ring, and a plurality of upper limit blocks are fixedly connected to the bottom of the inner wall of the main body, and the ball is located between the upper limit block and the lower limit block.

[0012] Preferably, the outer wall of the support ring is movably connected to a limiting ring, the limiting ring is connected to the bottom of the outer wall of the main body, and the bottom of the inner wall of the limiting ring is provided with a recessed portion, the top of the outer wall of the support ring is fixedly connected with a raised portion, and the recessed portion and the raised portion fit each other.

[0013] Preferably, a positioning rod is fixedly connected to the top surface of the support ring, a positioning groove is provided on the bottom surface of the main body, and the positioning rod is located in the positioning groove.

[0014] Preferably, the gas delivery component includes a flow meter and a flow regulating valve, both of which are located in the air inlet pipe, a mounting seat is fixedly connected to the top of the outer wall of the main body, the control system is located in the mounting seat, an air inlet is opened in the upper and middle part of one side of the main body, and one end of the air inlet pipe passes through the mounting seat and is located in the air inlet.

[0015] Preferably, an extrusion mechanism is provided inside the main body, and the extrusion mechanism includes a limiting bead, and the limiting bead is movably connected to the bottom of the pressure ring, and the bottom of the limiting bead contacts the top surface of the ball.

[0016] Preferably, a mounting groove is provided on the top surface of the pressure ring, a spring is installed in the mounting groove, an embedding groove is provided on the outer middle part of the top surface of the inner wall of the main body, the top of the spring is engaged in the embedding groove, and a beam entrance for projecting a laser beam is provided in the middle part of the top surface of the inner wall of the main body.

[0017] Preferably, the ranging assembly includes an ear plate, which is fixedly connected to the middle part of the outer wall of the main body, and a displacement sensor is installed inside the ear plate, the measuring end of the displacement sensor points to the pressure ring, and an installation opening is opened in the middle and lower part of the outer wall of the main body, and the ear plate is located in the installation opening.

[0018] Preferably, the control system includes an information collection module, a data processing module and a control module;

[0019] The information collection module is used to collect data from the displacement sensor, the flow control valve and the flow meter;

[0020] The data processing module is used to perform calculations based on the data collected by the information collection module;

[0021] The control module is used to control the opening and closing degree of the flow control valve according to the calculation results of the data processing module.

[0022] Preferably, the data processing module calculates the opening and closing degree change of the flow control valve according to the following formula:

[0023] ΔV=K x ·(x target -x)+K Q ·(Q target -Q)

[0024] V new =V current +ΔV

[0025] Where: ΔV is the opening and closing degree change of the flow control valve, K x is the displacement control coefficient, x target is the ideal distance between the target pressure ring and the weldment, x is the initial position value of the pressure ring measured by displacement sensor 1, K Q is the flow control coefficient, Q target is the target gas flow rate, Q is the current gas flow rate measured by the flowmeter, V new is the opening and closing degree of the flow control valve after adjustment, V current It is the opening and closing degree of the current flow control valve.

[0026] Working principle: When in use, the main part is installed on the welding device. At this time, the laser beam can enter the main part from the beam entrance. At this time, the gas source is connected to the air inlet pipe, and then the gas can enter the main part. At this time, the welding device is driven to move to the welding assembly, and the ball contacts the welding part. At this time, after the light beam passes through the ball, since the ball is made of transparent material and is spherical, the laser beam can be focused. At this time, the energy of the laser beam can be used to heat the welding to melt it. At this time, the ball block can squeeze the welding parts on both sides to merge them. After they cool and solidify, the welding parts can be combined into one to achieve laser welding. In the process of welding, the air inlet The gas entering the main part through the tube will impact the ball, and the ball can be pushed out to squeeze the welded part, and the squeezing of the weld can push the ball back, so that the ball can be in a suspended state, and the excess airflow can be discharged from the gap between the ball, the upper limit block and the lower limit block, and the airflow will impact the welded part after blowing out, and then the surface of the welded part can be cleaned. During welding, the gas supply can also be stopped, and when the welded part squeezes the ball, the pressure ring will be squeezed at this time, and then the spring can be squeezed, and the reaction force of the spring can support the ball, so the ball can be supported by both pneumatic and elastic methods.

[0027] The present invention provides a laser welding assembly. It has the following beneficial effects:

[0028] 1. The present invention sets a pressure ring above the ball and moves synchronously with the ball, uses a distance measuring component to detect the displacement distance of the pressure ring and the ball, and uses a control system to adjust the gas flow of the gas transmission component. Therefore, when the surface of the weld is uneven, the ball can be stably placed in the limit mechanism by adjusting the size of the squeezing force of the ball by the gas flow, thereby avoiding friction between the ball and the component, which may cause damage to the ball and affect the welding quality.

[0029] 2. The present invention can push out the pressure ring and the ball by utilizing the elastic force of the spring, so the limiting bead will always be in contact with the ball. Therefore, when the ball rolls, the limiting bead will rotate with the ball, thereby reducing the friction between the two, thereby preventing the surface of the ball from being scratched, and thus increasing the service life of the device.

[0030] 3. The present invention separates the limit ring from the main part. At this time, the support ring and the ball will be separated from the main part along with the limit ring, and then the ball will be replaced. During installation, the ball is placed in the support ring and the lower limit block is used to limit the ball to prevent it from falling. Then, the positioning rod is inserted into the positioning groove, and then the limit ring is pushed close to the main part to reinstall the support ring on the bottom of the main part. This makes it convenient to load and unload the ball, which is beneficial to its maintenance in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the internal structure of the main body of the present invention;

[0033] Figure 3 for Figure 2 A in the enlarged view;

[0034] Figure 4 This is a partial structural diagram of the main body of the present invention;

[0035] Figure 5 It is a disassembled diagram of the spring part structure of the present invention;

[0036] Figure 6 It is a front cross-sectional view of the mounting seat of the present invention;

[0037] Figure 7 It is a front cross-sectional view of the air intake pipe of the present invention;

[0038] Figure 8 for Figure 4 Enlarged view of point B in .

[0039] Among them, 1. main body; 101. light beam entrance; 102. embedded groove; 103. air inlet; 104. installation port; 2. limit ring; 201. recessed part; 202. raised part; 3. ball; 4. limit mechanism; 401. support ring; 402. lower limit block; 403. upper limit block; 404. positioning rod; 405. positioning groove; 5. air inlet pipe; 6. air delivery component; 601. flow meter; 602. flow regulating valve; 7. mounting seat; 701. control system; 8. distance measuring component; 801. ear plate; 802. displacement sensor; 9. extrusion mechanism; 901. pressure ring; 902. limit bead; 903. spring; 904. installation groove. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Please refer to the attached Figure 1-Figure 2 An embodiment of the present invention provides a laser welding assembly, including: a main body 1, a ball 3 is installed at the bottom, a pressure ring 901 for synchronous displacement with the ball 3 is arranged on the top of the ball 3, and a limit mechanism 4 for limiting the displacement of the ball 3 is installed at the bottom of the inner wall of the main body 1; an air inlet pipe 5, which is located at the top of the right side of the main body 1 and is used to guide gas into the main body 1, and a gas supply assembly 6 for limiting the gas flow is arranged in the air inlet pipe 5; a distance measuring assembly 8, which is located in the middle of the outer wall of the main body 1 and is used to detect the displacement distance of the pressure ring 901; a control system 701, which is located outside the air inlet pipe 5 and is electrically connected to the distance measuring assembly 8 and the gas supply assembly 6, and is used to adjust the gas flow of the gas supply assembly 6 according to the distance between the pressure ring 901 and the weldment.

[0042] The main body 1 is the core structure of the entire welding assembly, used to support and connect other key components. It contains channels for laser beam conduction and installation areas for other control systems 701, ensuring that the laser beam can be smoothly transmitted to the welded part, while supporting the operation of the gas flow and displacement sensor 802;

[0043] During welding, the air inlet pipe 5 is used to guide the gas into the channel in the main body 1, and the ball 3 is used to contact the welded part and apply pressure. At the same time, its transparent material allows the laser beam to pass through and focus on it, and at the same time, it can roll smoothly on the surface of the welded part to reduce friction. During the welding process, the pressure ring 901 serves as a mechanical support device for the ball 3, and is used to move synchronously with the ball 3 to ensure that the ball 3 remains stable during the up and down displacement process.

[0044] The limiting mechanism 4 is used to limit the maximum displacement range of the ball 3, ensuring that the ball 3 always remains in a stable working range, avoiding excessive or insufficient displacement of the ball 3, which may lead to welding instability or failure, and preventing it from moving beyond the expected range due to excessive gas impact and entering the air intake pipe 5;

[0045] At this time, the distance measuring component 8 can be used to measure the up and down displacement of the pressure ring 901. Since the pressure ring 901 moves synchronously with the ball 3, the up and down displacement of the ball 3 can be known by measuring the pressure ring 901, and then the distance between the bottom of the ball 3 and the welding part can be known. This data provides the control system 701 with feedback on the real-time position of the ball 3. Subsequently, the control system 701 adjusts the gas flow of the gas delivery component 6 in real time according to the distance information between the pressure ring 901 and the welding part provided by the distance measuring component 8, thereby controlling the downward pressure of the ball 3 on the welding part to ensure the welding process The stability and accuracy of the process can be improved, and when the surface of the weld is uneven, the ball 3 can be stably placed in the limiting mechanism 4 by adjusting the squeezing force of the gas flow on the ball 3. That is, when the airflow is large, the impact force on the ball 3 is large, and the ball 3 moves down and close to the weld; when the airflow is small, the impact force on the ball 3 is small, and the ball 3 moves up and away from the weld. Therefore, the ball 3 can be always in a suspended state in the limiting mechanism 4, thereby avoiding the friction between the ball 3 and the component, which may cause damage to the ball 3 and affect the welding quality.

[0046] Please refer to the attached Figure 1-Figure 4 The limiting mechanism 4 includes a support ring 401, which is located on the bottom surface of the main body 1. A plurality of lower limit blocks 402 are fixedly connected to the inner wall of the support ring 401. A plurality of upper limit blocks 403 are fixedly connected to the bottom of the inner wall of the main body 1, and the ball 3 is located between the upper limit block 403 and the lower limit block 402.

[0047] The displacement distance of the ball 3 can be limited by the lower limit block 402 and the upper limit block 403, so that its displacement is within a fixed range. At the same time, the lower limit block 402 and the upper limit block 403 are both set to be spherical, and the number of the two is set to at least three. By setting the two to be spherical, gaps will appear between adjacent ones, so that the gas can be discharged.

[0048] Please refer to the attached Figure 2-Figure 4 The outer wall of the support ring 401 is movably connected to the limit ring 2, the limit ring 2 is connected to the bottom of the outer wall of the main body 1, and the bottom of the inner wall of the limit ring 2 is provided with a recessed portion 201, and the top of the outer wall of the support ring 401 is fixedly connected to the protrusion 202, and the recessed portion 201 and the protrusion 202 fit each other. The top surface of the support ring 401 is fixedly connected to a positioning rod 404, and the bottom surface of the main body 1 is provided with a positioning groove 405, and the positioning rod 404 is located in the positioning groove 405.

[0049] The limit ring 2 is located at the bottom of the main body 1, and is used to fix the limit mechanism 4 so that it supports the ball 3, thereby controlling the downward displacement of the ball 3. The limit ring 2 and the main body 1 are movably connected, and the two are connected using a plug-in structure. Therefore, when the ball 3 needs to be replaced, the limit ring 2 is pulled out to separate it from the outside of the main body 1. At this time, the support ring 401 will be removed from the main body 1 simultaneously due to the loss of the limit of the limit ring 2. At this time, the ball 3 will be removed along with the support ring 401. At this time, the ball 3 can be removed, and then a new ball 3 is placed in the support ring 401, and then the support ring 401 is moved to make it close to the main body 1, and the positioning rod 404 is inserted into the positioning groove 405. At this time, the position of the support ring 401 can be guided, and finally the limit ring 2 is pushed close to the main body 1 so that it is at the bottom of the outer wall of the main body 1. This makes the loading and unloading of the ball 3 convenient, which is beneficial to later maintenance.

[0050] Please refer to the attached Figure 1 , Figure 2 and Figure 7 The gas delivery component 6 includes a flow meter 601 and a flow regulating valve 602, both of which are located in the air inlet pipe 5. A mounting seat 7 is fixedly connected to the top of the outer wall of the main body 1, and the control system 701 is located in the mounting seat 7. An air inlet 103 is opened in the middle and upper part of one side of the main body 1, and one end of the air inlet pipe 5 passes through the mounting seat 7 and is located in the air inlet 103.

[0051] By installing a flow meter 601 and a flow regulating valve 602 in the intake pipe 5, the flow meter 601 can be used to detect the flow rate of the air in the intake pipe 5, and the flow control valve can control the amount of air flowing through the intake pipe 5 per unit time, thereby adjusting the amount of gas entering the intake pipe 5, and thereby adjusting the pressure of the airflow on the ball 3. That is, when more airflow enters the main body 1 per unit time, the airflow and pressure are both large, and the ball 3 is pushed out close to the welding part. When less airflow enters the main body 1 per unit time, the airflow and pressure are both small, and the ball 3 is squeezed back by the welding part and enters the main body 1.

[0052] Please refer to the attached Figure 1 , Figure 5 and Figure 8 The main body 1 is provided with an extrusion mechanism 9, which includes a limiting bead 902, which is movably connected to the bottom of the pressure ring 901, and the bottom of the limiting bead 902 contacts the top surface of the ball 3. The top surface of the pressure ring 901 is provided with a mounting groove 904, and a spring 903 is installed in the mounting groove 904. The middle outer part of the top surface of the inner wall of the main body 1 is provided with an embedding groove 102, and the top of the spring 903 is engaged in the embedding groove 102, and the middle part of the top surface of the inner wall of the main body 1 is provided with a beam entrance 101 for projecting a laser beam.

[0053] By arranging a limiting bead 902 between the pressure ring 901 and the ball 3, when the ball 3 moves, the limiting bead 902 will move with the ball 3, and there is point contact between the limiting bead 902 and the ball 3, thereby reducing the friction between the two, avoiding the ball 3 from being damaged due to large friction, and when the ball 3 is not supported by gas, the elastic force of the spring 903 can be used to support the pressure ring 901 and the limiting bead 902, so that the ball 3 can be pushed out, so that the ball 3 can be brought into contact with the weldment, and the device can realize both pneumatic and elastic working modes.

[0054] Please refer to the attached Figure 1 , Figure 2 , Figure 4 and Figure 6 The distance measuring component 8 includes an ear plate 801, which is fixedly connected to the middle part of the outer wall of the main body 1. A displacement sensor 802 is installed inside the ear plate 801. The measuring end of the displacement sensor 802 points to the pressure ring 901, and an installation opening 104 is opened in the middle and lower part of the outer wall of the main body 1, and the ear plate 801 is located in the installation opening 104.

[0055] The displacement sensor 802 can be fixed by the ear plate 801. The displacement sensor 802 can be used to detect the up and down displacement of the pressure ring 901. The pressure ring 901 moves with the ball 3, and the up and down displacement of the ball 3 can be obtained, thereby providing data support for the control system 701.

[0056] Please refer to the attached Figure 1 , Figure 2 and Figure 7 The control system 701 includes an information collection module, a data processing module and a control module; the information collection module is used to collect data from the displacement sensor 802, the flow control valve 602 and the flow meter 601; the data processing module is used to perform calculations based on the data collected by the information collection module; the control module is used to control the opening and closing degree of the flow control valve 602 based on the calculation results of the data processing module.

[0057] The data processing module calculates the opening and closing degree change of the flow control valve 602 according to the following formula:

[0058] ΔV=K x ·(x target -x)+K Q ·(Q target -Q)

[0059] V new =V current +ΔV

[0060] Where: ΔV is the opening and closing degree change of the flow control valve 602, K x is the displacement control coefficient, x targetis the ideal distance between the target pressure ring 901 and the weldment, x is the initial position value of the pressure ring 901 measured by the displacement sensor 802, K Q is the flow control coefficient, Q target is the target gas flow rate, Q is the current gas flow rate measured by the flow meter 601, and V new is the opening and closing degree of the flow control valve 602 after adjustment, V current is the opening and closing degree of the current flow control valve 602.

[0061] The data of the displacement sensor 802, the flow control valve 602 and the flow meter 601 are calculated by the formula. The opening and closing degree of the flow control valve 602 can be controlled by the calculation result, thereby adjusting the unit flow rate of the airflow. When the airflow rate is large, the ball 3 is close to the welding part. When the airflow rate is small, the ball 3 retracts into the main body 1. In this way, the position of the ball 3 inside the main body 1 can be flexibly adjusted to make the ball 3 in a suspended state.

[0062] By making the ball 3 in a suspended state during the welding process, it will not contact the upper limit block 403 and the lower limit block 402, thereby avoiding wear caused by friction, extending the service life of the components, and reducing the probability of damage to the ball 3 and the limit mechanism 4, thereby reducing the maintenance frequency of the equipment, and reducing maintenance costs and downtime;

[0063] And by adjusting the size of the airflow, the ball 3 can apply uniform and controllable pressure to the weld. Compared with direct mechanical contact, the ball 3 in the airflow suspension state can distribute the pressure more smoothly, and will not cause unstable welding pressure due to uneven position or mechanical friction. At the same time, the airflow can be adjusted in real time according to the shape changes of the weld. The pressure of the ball 3 can be flexibly changed, so that the ball 3 can accurately press the irregular surface, ensure the consistency of the welding quality, and avoid poor welding caused by uneven surface.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser welding assembly, characterized in that: include: A main body (1) is provided with a ball (3) at its bottom, a pressure ring (901) is provided on the top of the ball (3) for synchronous displacement with the ball (3), and a limiting mechanism (4) is provided at the bottom of the inner wall of the main body (1) for limiting the displacement of the ball (3); An air inlet pipe (5), which is located at the top of the right side of the main body (1) and is used to guide gas into the main body (1), and a gas delivery component (6) for limiting the gas flow is arranged in the air inlet pipe (5); A distance measuring component (8), which is located in the middle of the outer wall of the main body (1) and is used to detect the displacement distance of the pressure ring (901); The control system (701) is located outside the air inlet pipe (5) and is electrically connected to the distance measuring component (8) and the gas delivery component (6), and is used to adjust the gas flow of the gas delivery component (6) according to the distance between the pressure ring (901) and the welding part.

2. A laser welding assembly according to claim 1, characterized in that: The limiting mechanism (4) comprises a support ring (401), the support ring (401) is located on the bottom surface of the main body (1), a plurality of lower limiting blocks (402) are fixedly connected to the inner wall of the support ring (401), a plurality of upper limiting blocks (403) are fixedly connected to the bottom of the inner wall of the main body (1), and the ball (3) is located between the upper limiting block (403) and the lower limiting block (402).

3. A laser welding assembly according to claim 2, characterized in that: The outer wall of the support ring (401) is movably connected to a limit ring (2), the limit ring (2) is connected to the bottom of the outer wall of the main body (1), and the bottom of the inner wall of the limit ring (2) is provided with a recessed portion (201), and the top of the outer wall of the support ring (401) is fixedly connected with a raised portion (202), and the recessed portion (201) and the raised portion (202) are in contact with each other.

4. A laser welding assembly according to claim 3, characterized in that: The top surface of the support ring (401) is fixedly connected with a positioning rod (404), the bottom surface of the main body (1) is provided with a positioning groove (405), and the positioning rod (404) is located in the positioning groove (405).

5. The laser welding assembly according to claim 1, characterized in that: The gas delivery assembly (6) comprises a flow meter (601) and a flow regulating valve (602), the flow meter (601) and the flow regulating valve (602) are both located in the air inlet pipe (5), a mounting seat (7) is fixedly connected to the top of the outer wall of the main body (1), the control system (701) is located in the mounting seat (7), an air inlet (103) is provided in the middle and upper part of one side of the main body (1), and one end of the air inlet pipe (5) passes through the mounting seat (7) and is located in the air inlet (103).

6. A laser welding assembly according to claim 5, characterized in that: An extrusion mechanism (9) is arranged inside the main body (1), and the extrusion mechanism (9) includes a limiting bead (902). The limiting bead (902) is movably connected to the bottom of the pressure ring (901), and the bottom of the limiting bead (902) contacts the top surface of the ball (3).

7. A laser welding assembly according to claim 6, characterized in that: The top surface of the pressure ring (901) is provided with a mounting groove (904), a spring (903) is installed in the mounting groove (904), an embedding groove (102) is provided on the outer middle part of the top surface of the inner wall of the main body (1), the top of the spring (903) is engaged in the embedding groove (102), and a beam entrance (101) for projecting a laser beam is provided in the middle part of the top surface of the inner wall of the main body (1).

8. A laser welding assembly according to claim 7, characterized in that: The distance measuring component (8) comprises an ear plate (801), wherein the ear plate (801) is fixedly connected to the middle part of the outer wall of the main body (1), a displacement sensor (802) is installed inside the ear plate (801), the measuring end of the displacement sensor (802) points to the pressure ring (901), and a mounting opening (104) is opened in the middle and lower part of the outer wall of the main body (1), and the ear plate (801) is located in the mounting opening (104).

9. A laser welding assembly according to claim 8, characterized in that: The control system (701) comprises an information collection module, a data processing module and a control module; The information collection module is used to collect data from the displacement sensor (802), the flow control valve (602) and the flow meter (601); The data processing module is used to perform calculations based on the data collected by the information collection module; The control module is used to control the opening and closing degree of the flow control valve (602) according to the calculation results of the data processing module.

10. A laser welding assembly according to claim 9, characterized in that: The data processing module calculates the opening and closing degree change of the flow control valve (602) according to the following formula: ΔV=K x ·(x target -x)+K Q ·(Q target -Q) V new =V current +ΔV Where: ΔV is the opening / closing degree change of the flow control valve (602), K x is the displacement control coefficient, x target is the ideal distance between the target pressure ring (901) and the weldment, x is the initial position value of the pressure ring (901) measured by the displacement sensor 1 (802), K Q is the flow control coefficient, Q target is the target gas flow rate, Q is the current gas flow rate measured by the flow meter (601), V new is the opening and closing degree of the flow control valve (602) after adjustment, V current is the opening and closing degree of the current flow control valve (602).

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