Laser welding process for large-thickness workpiece with internal self-formed keel

Abstract

The invention relates to the technical field of laser welding, and discloses a laser welding process for a large-thickness workpiece internally forming a keel, which comprises a welding gun, and a button is arranged on the welding gun. In the welding process, when welding needs to be canceled, the standard operation that the welding gun is lifted firstly and then the button is loosened is achieved, so that the situation that the welding wire is cooled due to the fact that the button is loosened firstly, and the welding wire cannot be smoothly broken and broken when the welding gun is lifted, so that the welding gun carries the welding wire to pull the welding seam, and the welding seam is damaged is avoided; the position of the ejector rod is adjusted, the ejector rod is adjusted to the other side, normal use is guaranteed, gas is injected into the hose through an external gas pump, generated gas flow is sprayed out through the annular pipe, the channel and the nozzle, welding slag on the movement path of the ejector rod is blown away and cleaned, the ejector rod cannot abut against the welding slag, and smooth sliding of the ejector rod is not affected; and the ejector rod can move smoothly.

Description

Technical Field

[0001] The invention belongs to the technical field of laser welding, and in particular relates to a laser welding process for a thick workpiece with a self-formed keel inside. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. In the 1970s, it was 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 surface of the workpiece, and the surface heat diffuses to the inside through heat conduction. By controlling the width, energy, peak power and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool. Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts.

[0003] When laser welding a thick workpiece with a self-contained keel, when welding is about to end, the user tends to habitually release the button of the welding gun first, causing the welding gun to stop working, resulting in cooling between the welding wire and the weld, and wire breakage. When the welding gun is subsequently taken away, the welding gun is likely to pull the weld with the welding wire, causing damage to the weld.

[0004] Therefore, it is necessary to invent a laser welding process for thick workpieces with internal self-keel to solve the above problems. Summary of the invention

[0005] In view of the above problems, the present invention provides a laser welding process for a thick workpiece with an internal self-forming keel to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a laser welding process for a thick workpiece with an internal self-formed keel, comprising a welding gun, a button is provided on the welding gun, a transverse groove is provided on one side of the button, a clamping groove connected to the transverse groove is provided on one side of the button, a bracket is fixedly installed on the outside of the welding gun, a shell is fixedly installed on the inside of the bracket, a clamping rod is slidably inserted into the inside of the shell, a pressure plate is fixedly sleeved on the outside of the clamping rod, a first spring is sleeved on the outside of the clamping rod, the first spring is located on the side of the pressure plate away from the transverse groove, one end of the clamping rod is in contact with the inner wall of the transverse groove, and a pulling component for pulling the clamping rod is provided on the outside of the clamping rod;

[0007] The welding process is as follows:

[0008] S1. When in use, hold the welding gun so that the tip of the welding gun is close to the part to be welded. At this time, the pulling assembly cancels the pulling of the clamping rod. Since the clamping rod is in conflict with the inner wall of the horizontal groove, it cannot move. At this time, the first spring is in a compressed state;

[0009] S2. Then, the button is pressed. As the button is pressed, the end of the clamping rod moves relative to the horizontal groove. When the button is fully pressed, the welding gun head works. At this time, the clamping rod is aligned with the clamping groove. The first spring releases the force to move the pressure plate and the clamping rod toward the direction close to the clamping groove, so that the clamping rod enters the clamping groove. At this time, the button is locked and cannot move. Therefore, during the welding process, even if the button is released, the button still cannot move, so the welding gun will not stop working.

[0010] S3. When it is necessary to stop welding, the welding gun is lifted up to move away from the welding position, and the pulling assembly pulls the clamping rod to move it in a direction away from the clamping slot, so that the first spring is compressed with the pressure plate to deform and generate a force. Since the clamping rod is not completely out of the clamping slot, the button still cannot move to reset during the process of lifting the welding gun, and the welding gun head remains in a working state.

[0011] S4. When the welding gun completely leaves the welding position, the clamping rod is completely reset and leaves the clamping slot, and the button is reset so that the clamping rod contacts the inner wall of the horizontal slot again, and the welding gun stops working at this time, so that when welding needs to be canceled, the standard operation of lifting the welding gun first and then releasing the button is realized.

[0012] Furthermore, the pulling assembly includes a pull rope fixedly connected to the end of the clamping rod away from the transverse groove, a side plate is fixedly installed on the outer side of the bracket, a guide wheel is rotatably installed on the inner side of the side plate, a baffle is fixedly installed on the inner side of the side plate away from the bracket, one end of the pull rope passes through between the guide wheel and the baffle, a slide groove is provided on the outer side of the welding gun, a slider is slidably installed in the slide groove, the side of the slider away from the welding gun head is fixedly connected to the inner wall of the slide groove through a second spring, the outer side of the slider is fixedly connected to a pull block through a connecting frame, the pull block is fixedly connected to the other end of the pull rope, and a push rod is provided on the side of the connecting frame close to the welding gun head.

[0013] Furthermore, a ring groove is provided on a side of the connecting frame away from the button, a ring plate is rotatably installed in the ring groove, a positioning component for positioning the ring plate is provided on the outside of the ring plate, and the ring plate is fixedly connected to the push rod.

[0014] Furthermore, the positioning assembly includes a screw rod, a screw hole communicating with the annular groove is formed on the outer side of the pull block, and the screw rod is threadedly connected in the screw hole.

[0015] Furthermore, a semicircular opening connected to the annular groove is provided on a side of the connecting frame away from the push rod, and a side of the ring plate close to the semicircular opening is fixedly connected to a ring tube via a connecting rod extending outside the semicircular opening. The push rod, the ring plate and the connecting rod are commonly provided with a channel connected to the ring tube. Spouts are symmetrically provided on a side of the push rod away from the ring plate, and a hose connected to the ring tube is provided on the outside of the ring tube.

[0016] Furthermore, the nozzle is arranged parallel to the handle of the welding gun, and the nozzle is opened obliquely and faces the side of the ejector rod away from the welding gun.

[0017] Furthermore, the stiffness coefficient of the second spring is greater than the stiffness coefficient of the first spring.

[0018] Furthermore, the distance between the end of the push rod away from the ring plate and the button is greater than the distance between the welding gun head and the button.

[0019] Technical effects and advantages of the present invention:

[0020] 1. The present invention can lock the button during welding. When canceling welding, the welding gun is first lifted and then the button is unlocked, so that the button is reset and the welding gun stops working. This realizes the standard operation of first lifting the welding gun and then releasing the button when it is necessary to cancel welding. This can avoid the situation where the button is released first, resulting in cooling of the welding wire. When the welding gun is lifted, the welding wire cannot be disconnected smoothly and the wire is not broken, so that the welding gun pulls the weld with the welding wire and causes damage to the weld, thereby ensuring the quality of welding.

[0021] 2. The present invention adjusts the position of the ejector rod to the other side so that it can keep in contact with the surface of the workpiece to ensure normal use;

[0022] 3. The present invention injects air into the hose through an external air pump, so that the generated airflow is ejected through the annular tube, the channel, and the nozzle, so that the welding slag on the movement path of the ejector rod is blown away for cleaning, so that the ejector rod will not conflict with the welding slag and affect its smooth sliding, so that the ejector rod can move smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a welding gun according to an embodiment of the present invention is shown;

[0024] Figure 2 The cross-sectional structure diagram of the welding gun according to the embodiment of the present invention is shown. Figure 1 ;

[0025] Figure 3 The embodiment of the present invention is shown Figure 2 The enlarged structural diagram at A in the middle;

[0026] Figure 4 The embodiment of the present invention is shown Figure 1 The enlarged structural diagram at B in the middle;

[0027] Figure 5 The cross-sectional structure diagram of the welding gun according to the embodiment of the present invention is shown. Figure 2 ;

[0028] Figure 6 The embodiment of the present invention is shown Figure 5 The enlarged structural diagram at C in the middle;

[0029] Figure 7 The embodiment of the present invention is shown Figure 5 The enlarged structural diagram at D in the middle;

[0030] In the figure: 1. welding gun; 2. button; 3. horizontal groove; 4. card slot; 5. bracket; 6. shell; 7. card rod; 8. pressure plate; 9. first spring; 10. pull rope; 11. side plate; 12. guide wheel; 13. baffle; 14. slide block; 15. second spring; 16. pull block; 17. push rod; 18. ring plate; 19. screw; 20. connecting rod; 21. channel; 22. nozzle; 23. ring pipe; 24. hose; 25. connecting frame. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0032] The present invention provides a laser welding process for thick workpieces with internal self-keel, such as Figures 1 to 7 As shown, the welding gun 1 includes a welding gun 1, which is a handheld laser welding gun. The welding gun 1 is provided with a button 2, which is a button on a handheld laser welding gun in the prior art. The button 2 can be automatically reset after being pressed and released. A transverse groove 3 is provided on one side of the button 2, and a clamping groove 4 connected to the transverse groove 3 is provided on one side of the button 2. A bracket 5 is fixedly installed on the outside of the welding gun 1, and a shell 6 is fixedly installed inside the bracket 5. A clamping rod 7 is slidably inserted inside the shell 6. A pressure plate 8 is fixedly sleeved on the outside of the clamping rod 7, and a first spring 9 is sleeved on the outside of the clamping rod 7. The first spring 9 is located on the side of the pressure plate 8 away from the transverse groove 3. One end of the clamping rod 7 contacts the inner wall of the transverse groove 3, and a pulling component for pulling the clamping rod 7 is provided on the outside of the clamping rod 7.

[0033] The welding process is as follows:

[0034] S1. When in use, hold the welding gun 1 so that its tip is close to the part to be welded. At this time, the pulling assembly cancels the pulling of the clamping rod 7. Since the clamping rod 7 is in conflict with the inner wall of the horizontal groove 3, it cannot move. At this time, the first spring 9 is in a compressed state;

[0035] S2, then press the button 2, and as the button 2 is pressed, the end of the clamping rod 7 moves relative to the transverse groove 3. When the button 2 is fully pressed, the welding gun 1 works at this time, and the clamping rod 7 is aligned with the clamping groove 4. The first spring 9 releases the force to move the pressure plate 8 and the clamping rod 7 toward the direction close to the clamping groove 4, so that the clamping rod 7 enters the clamping groove 4. At this time, the button 2 is locked and cannot move. Therefore, during the welding process, even if the button 2 is released, the button 2 still cannot move, so the welding gun 1 will not stop working;

[0036] S3. When it is necessary to stop welding, the welding gun 1 is lifted up to move away from the welding position, and the pulling assembly pulls the clamping rod 7 to move it away from the clamping slot 4, so that the clamping plate 8 compresses the first spring 9 to deform it and generate a force. Since the clamping rod 7 is not completely separated from the clamping slot 4, the button 2 still cannot move to reset during the process of lifting the welding gun 1, and the gun head of the welding gun 1 remains in a working state;

[0037] S4. When the welding gun 1 completely leaves the welding position, the clamping rod 7 is completely reset and leaves the clamping slot 4, and the button 2 is reset so that the clamping rod 7 contacts the inner wall of the horizontal slot 3 again. At this time, the welding gun 1 stops working, so that when it is necessary to cancel welding, the standard operation of first lifting the welding gun 1 and then releasing the button 2 is realized.

[0038] This can avoid the situation where the button 2 is released first, causing the welding wire to cool down. When the welding gun 1 is lifted, the welding wire cannot be disconnected smoothly and the welding gun 1 pulls the weld with the welding wire, causing damage to the weld, thereby ensuring the quality of welding.

[0039] like Figures 1 to 7 As shown, the pulling assembly includes a pull rope 10 fixedly connected to the end of the clamping rod 7 away from the transverse groove 3, a side plate 11 is fixedly installed on the outer side of the bracket 5, a guide wheel 12 is rotatably installed on the inner side of the side plate 11, a baffle 13 is fixedly installed on the inner side of the side plate 11 away from the bracket 5, one end of the pull rope 10 passes through between the guide wheel 12 and the baffle 13, a slide groove is provided on the outer side of the welding gun 1, a slider 14 is slidably installed in the slide groove, the side of the slider 14 away from the gun head of the welding gun 1 is fixedly connected to the inner wall of the slide groove through a second spring 15, the outer side of the slider 14 is fixedly connected to a pull block 16 through a connecting frame 25, the pull block 16 is fixedly connected to the other end of the pull rope 10, and a push rod 17 is provided on the side of the connecting frame 25 close to the gun head of the welding gun 1.

[0040] When the tip of the welding gun 1 is close to the welding point, the push rod 17 at this time first contacts with the surface of the workpiece to be welded. Due to the human hand or external fixing equipment, the two workpieces to be welded together cannot move, so the push rod 17 cannot push the workpiece. As the push rod 17 contacts with the workpiece, the connecting frame 25 is pushed to move in the direction close to the button 2, thereby moving the slider 14 and the pull block 16 accordingly. The slider 14 compresses the second spring 15 to deform it and generate a force. As the pull block 16 moves, the pull rope 10 becomes loose, and the pulling of the clamping rod 7 is cancelled. When the welding gun 1 is lifted to leave the welding point, the second spring 15 at this time continuously releases the force to reset the slider 14, the connecting frame 25, and the pull block 16, so that the pull rope 10 pulls the clamping rod 7 to reset.

[0041] like Figure 1 and Figure 6As shown, a ring groove is provided on one side of the connecting frame 25 away from the button 2 , and a ring plate 18 is rotatably mounted in the ring groove. A positioning assembly for positioning the ring plate 18 is provided on the outside of the ring plate 18 , and the ring plate 18 is fixedly connected to the push rod 17 .

[0042] Cancel the positioning of the ring plate 18 by the positioning assembly. At this time, the ring plate 18 can rotate, and the push rod 17 is moved to make it rotate with the ring plate 18, so that the position of the push rod 17 is adjusted. During actual welding, the position of the push rod 17 may not be exactly in contact with the surface of the workpiece. By adjusting the position of the push rod 17, it is moved to the other side so that it can maintain contact with the surface of the workpiece to ensure normal use.

[0043] like Figure 6 As shown, the positioning assembly includes a screw rod 19, and a screw hole communicating with the annular groove is formed on the outer side of the pull block 16, and the screw rod 19 is threadedly connected in the screw hole.

[0044] The screw rod 19 is rotated forward to move away from the ring plate 18, thereby canceling the fixation of the ring plate 18, and the screw rod 19 is reversed to reset it to contact with the ring plate 18, thereby fixing the ring plate 18 by friction.

[0045] like Figure 1 , Figure 6 and Figure 7 As shown, a semicircular opening connected to the annular groove is formed on the side of the connecting frame 25 away from the push rod 17, and a ring tube 23 is fixedly connected to the side of the ring plate 18 close to the semicircular opening through a connecting rod 20 extending outside the semicircular opening. A channel 21 connected to the annular tube 23 is commonly provided inside the push rod 17, the ring plate 18, and the connecting rod 20. A nozzle 22 is symmetrically provided on the side of the push rod 17 away from the ring plate 18, and a hose 24 connected to the annular tube 23 is provided outside.

[0046] The hose 24 is connected to an external air pump. During the welding process, air is injected into the hose 24 through the external air pump, so that the air flow is ejected through the annular tube 23, the channel 21, and the nozzle 22, so that the welding slag on the movement path of the push rod 17 is blown away for cleaning, so that the push rod 17 will not conflict with the welding slag and affect its smooth sliding, so that the push rod 17 can move smoothly.

[0047] like Figure 1 and Figure 7 As shown, the nozzle 22 is arranged parallel to the handle direction of the welding gun 1 , and the nozzle 22 is opened obliquely and faces the side of the ejector rod 17 away from the welding gun 1 .

[0048] When the push rod 17 is on both sides of the welding gun 1 head, the airflow ejected from the nozzle 22 can blow away the welding slag on the path of the push rod 17, thereby ensuring the smooth movement of the push rod 17.

[0049] like Figure 1As shown, the spring constant of the second spring 15 is greater than the spring constant of the first spring 9 .

[0050] When the second spring 15 is reset, it can cooperate with the slider 14, the connecting frame 25, the pull block 16, and the pull rope 10 to overcome the elastic force of the first spring 9 and pull the clamping rod 7 to reset.

[0051] like Figure 1 As shown, the distance between the end of the push rod 17 away from the ring plate 18 and the button 2 is greater than the distance between the tip of the welding gun 1 and the button 2 .

[0052] The push rod 17 can contact the surface of the workpiece before the gun head of the welding gun 1 contacts the welding point.

[0053] Working principle: When in use, hold the welding gun 1 so that its tip is close to the place to be welded. When the welding gun 1 tip is close to the place to be welded, the push rod 17 at this time first contacts the surface of the workpiece to be welded. Due to the human hand or external fixing equipment, the two workpieces to be welded together cannot move, so the push rod 17 cannot push the workpiece. As the push rod 17 contacts the workpiece, the ring plate 18 and the connecting frame 25 are pushed in the direction close to the button 2, thereby moving the slider 14 and the pull block 16 accordingly. The slider 14 compresses the second spring 15 to deform it and generate a force. As the pull block 16 moves, the pull rope 10 becomes loose, and the pulling of the clamping rod 7 is cancelled. Since the clamping rod 7 is in contact with the inner wall of the transverse groove 3 at this time, it is unable to move. The clamping rod 7 is aligned with the slot 4, and the first spring 9 releases its force to move the pressure plate 8 and the clamping rod 7 toward the slot 4, so that the clamping rod 7 enters the slot 4. At this time, the button 2 is locked and cannot move. Therefore, during the welding process, even if the button 2 is released, the button 2 still cannot move, so the welding gun 1 will not stop working. When it is necessary to stop welding, the welding gun 1 is lifted up to leave the welding place. At this time, the second spring 15 continuously releases its force to move the slider 14 and the connecting rod 7. The bracket 25 and the pull block 16 are reset, so that the pull rope 10 pulls the card rod 7 to move it in the direction away from the card slot 4, so that the first spring 9 is compressed with the pressure plate 8 to deform and generate a force. Since the card rod 7 is not completely out of the card slot 4, the button 2 cannot move and reset during the process of lifting the welding gun 1, and the gun head of the welding gun 1 remains in a working state. When the welding gun 1 is completely away from the welding position, the card rod 7 is completely reset and leaves the card slot 4. The button 2 is reset so that the card rod 7 contacts the inner wall of the horizontal groove 3 again, and the operation of the welding gun 1 is stopped. When it is necessary to cancel welding, the standard operation of lifting the welding gun 1 first and then releasing the button 2 is realized, so that the button 2 can be avoided to be released first, resulting in cooling of the welding wire. When the welding gun 1 is lifted, The welding wire cannot be disconnected smoothly and is not broken, which causes the welding gun 1 to pull the weld with the welding wire and cause damage to the weld, thus ensuring the quality of welding; the screw rod 19 is turned forward to make it move in the direction away from the ring plate 18, and the fixation of the ring plate 18 is cancelled. At this time, the ring plate 18 can be rotated, and the push rod 17 is moved to make it rotate with the ring plate 18, so that the position of the push rod 17 is adjusted. Since the position of the push rod 17 may not be exactly in contact with the surface of the workpiece during actual welding, the position of the push rod 17 is adjusted to the other side so that it can keep in contact with the surface of the workpiece to ensure normal use. After the adjustment is completed, the screw rod 19 is reversed to reset it to contact with the ring plate 18, so that the ring plate 18 is fixed by friction;The hose 24 is connected to an external air pump. During the welding process, air is injected into the hose 24 through the external air pump, so that the generated airflow is ejected through the annular tube 23, the channel 21, and the nozzle 22, so that the welding slag on the moving path of the ejector 17 is blown away and cleaned, so that the ejector 17 will not conflict with the welding slag to affect its smooth sliding, so that the ejector 17 can move smoothly. ;

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A laser welding process for thick workpieces with internal self-forming keels, comprising a welding gun (1), characterized in that: The welding gun (1) is provided with a button (2), one side of the button (2) is provided with a transverse groove (3), one side of the button (2) is provided with a slot (4) connected to the transverse groove (3), a bracket (5) is fixedly installed on the outside of the welding gun (1), a shell (6) is fixedly installed inside the bracket (5), a clamping rod (7) is slidably inserted inside the shell (6), a pressure plate (8) is fixedly sleeved on the outside of the clamping rod (7), a first spring (9) is sleeved on the outside of the clamping rod (7), the first spring (9) is located on the side of the pressure plate (8) away from the transverse groove (3), one end of the clamping rod (7) is in contact with the inner wall of the transverse groove (3), and a pulling component for pulling the clamping rod (7) is provided on the outside; The welding process is as follows: S1. When in use, the welding gun (1) is held in the hand so that the tip of the gun is close to the part to be welded. At this time, the pulling assembly stops pulling the clamping rod (7). Since the clamping rod (7) is in contact with the inner wall of the transverse groove (3), it cannot move. At this time, the first spring (9) is in a compressed state. S2, then press the button (2), and as the button (2) is pressed, the end of the clamping rod (7) moves relative to the transverse groove (3). When the button (2) is fully pressed, the welding gun (1) gun head is working, and the clamping rod (7) is aligned with the clamping groove (4). The first spring (9) releases the force to move the pressure plate (8) and the clamping rod (7) in the direction close to the clamping groove (4), so that the clamping rod (7) enters the clamping groove (4). At this time, the button (2) is locked and cannot move. Therefore, during the welding process, even if the button (2) is released, the button (2) still cannot move, so the welding gun (1) will not stop working; S3. When it is necessary to stop welding, the welding gun (1) is lifted up to move it away from the welding position, and the pulling assembly pulls the clamping rod (7) to move it in a direction away from the clamping slot (4), so that the clamping plate (8) compresses the first spring (9) to deform it and generate a force. Since the clamping rod (7) is not completely separated from the clamping slot (4), the button (2) cannot move to reset during the process of lifting the welding gun (1), and the gun head of the welding gun (1) remains in a working state; S4. When the welding gun (1) is completely away from the welding position, the clamping rod (7) is completely reset and away from the clamping groove (4), and the button (2) is reset so that the clamping rod (7) contacts the inner wall of the horizontal groove (3) again. At this time, the operation of the welding gun (1) is stopped, so that when it is necessary to cancel welding, the standard operation of first lifting the welding gun (1) and then releasing the button (2) is realized.

2. The laser welding process for thick workpieces with internal self-formed keels according to claim 1 is characterized in that: The pulling assembly comprises a pulling rope (10) fixedly connected to an end of the clamping rod (7) away from the transverse groove (3); a side plate (11) is fixedly installed on the outer side of the bracket (5); a guide wheel (12) is rotatably installed on the inner side of the side plate (11); a baffle (13) is fixedly installed on the inner side of the side plate (11) away from the bracket (5); one end of the pulling rope (10) passes through between the guide wheel (12) and the baffle (13); a sliding groove is provided on the outer side of the welding gun (1); a slider (14) is slidably installed in the sliding groove; a side of the slider (14) away from the welding gun (1) gun head is fixedly connected to the inner wall of the sliding groove through a second spring (15); a pulling block (16) is fixedly connected to the outer side of the slider (14) through a connecting frame (25); the pulling block (16) is fixedly connected to the other end of the pulling rope (10); and a push rod (17) is provided on the side of the connecting frame (25) close to the welding gun (1) gun head.

3. The laser welding process for thick workpieces with internal self-formed keels according to claim 2 is characterized in that: A ring groove is formed on a side of the connecting frame (25) away from the button (2), a ring plate (18) is rotatably mounted in the ring groove, a positioning assembly for positioning the ring plate (18) is provided on the outside of the ring plate (18), and the ring plate (18) is fixedly connected to the push rod (17).

4. The laser welding process for thick workpieces with internal self-formed keels according to claim 3 is characterized in that: The positioning assembly comprises a screw rod (19), a screw hole communicating with the annular groove is provided on the outer side of the pull block (16), and the screw rod (19) is threadedly connected in the screw hole.

5. The laser welding process for thick workpieces with internal self-formed keels according to claim 4 is characterized in that: A semicircular opening communicating with the annular groove is formed on a side of the connecting frame (25) away from the push rod (17); a side of the annular plate (18) close to the semicircular opening is fixedly connected with an annular tube (23) via a connecting rod (20) extending outside the semicircular opening; a passage (21) communicating with the annular tube (23) is commonly formed inside the push rod (17), the annular plate (18) and the connecting rod (20); a nozzle (22) is symmetrically formed on a side of the push rod (17) away from the annular plate (18); and a hose (24) communicating with the annular tube (23) is formed outside the annular tube (23).

6. The laser welding process for thick workpieces with internal self-keel according to claim 5 is characterized in that: The nozzle (22) is arranged in parallel with the handle direction of the welding gun (1), and the nozzle (22) is opened obliquely and faces the side of the ejector rod (17) away from the welding gun (1).

7. The laser welding process for thick workpieces with internal self-formed keels according to claim 6 is characterized in that: The spring constant of the second spring (15) is greater than the spring constant of the first spring (9).

8. The laser welding process for thick workpieces with internal self-formed keels according to claim 7 is characterized in that: The distance between the end of the push rod (17) away from the ring plate (18) and the button (2) is greater than the distance between the tip of the welding gun (1) and the button (2).

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