Welding auxiliary equipment and welding method

Abstract

The embodiment of the invention provides welding auxiliary equipment and a welding method. The welding auxiliary equipment comprises a pipe body, and a gap is formed between the first end of the pipe body and a first to-be-welded part and used for containing a second to-be-welded part; a first channel is arranged in the pipe body, an opening is formed in the circumferential side wall of the pipe body, and the opening communicates with the first channel and the outside of the pipe body; airflow in the first channel flows out through the opening and forms an air wall at the gap, and the gap is located in the range of air holes of the air wall; an air outlet of the air guide structure faces the gap; the welding method adopts the welding auxiliary equipment. When the second to-be-welded part is placed in the gap for welding, the gap is located in the range of the air holes of the air wall, so that the air speed in the gap is zero, when protective gas is conveyed into the gap, the airflow of the protective gas is more stable, the protective gas in the gap can have the stable concentration, and then the quality of a welding seam is improved.

Description

Technical Field

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

[0002] Laser welding is generally used for the welding of power batteries. During the laser welding process, a shielding gas is blown into the welding area. The shielding gas can affect the weld formation, weld quality, weld penetration, and weld width. In most cases, blowing in the shielding gas has a beneficial effect on the weld.

[0003] Currently, when the aluminum shell cover of a lithium battery is welded to the top cover of the battery cell, the shielding gas is directly discharged into the air, which will inevitably cause energy waste and low efficiency. Moreover, the direct discharge into the air makes the gas flow of the shielding gas unstable and easily leads to poor welding. Summary of the Invention

[0004] The embodiments of this application provide a welding auxiliary device and a welding method. By forming a wind wall around the gap, the shielding gas is maintained within the gap to increase the concentration and stability of the shielding gas within the gap, thereby improving the weld quality.

[0005] In a first aspect, the embodiments of this application provide a welding auxiliary device for assisting in welding a first workpiece to be welded and a second workpiece to be welded. The welding auxiliary device includes:

[0006] A tube body. The first end of the tube body in the extending direction is used to face the first workpiece to be welded, and a gap is formed between the tube body and the first workpiece to be welded. The gap is used to place at least a part of the second workpiece to be welded. A first channel is provided inside the tube body. An opening is provided on the circumferential side wall of the tube body. The opening communicates the first channel with the outside of the tube body. The first channel is connected to a gas supply device. The airflow in the first channel flows out through the opening and forms a wind wall at the gap. The gap is within the range of the eye of the wind wall.

[0007] A gas guiding structure, which is connected to the gas supply device, and the air outlet of the gas guiding structure faces the gap.

[0008] In a possible implementation manner, the welding auxiliary device includes a guiding member provided on the circumferential outer side wall of the tube body. The airflow in the first channel flows out through the opening and is guided by the guiding member to the gap to form a wind wall.

[0009] In a possible implementation manner, the guiding member extends along the circumferential direction and the extending direction of the tube body. The number of the guiding members is multiple, and the multiple guiding members are arranged at intervals along the circumferential direction of the tube body.

[0010] In a possible implementation, the flow guiding member has a cross-section that is perpendicular to the extending direction of the pipe body;

[0011] The cross-section is in an airfoil shape and has two ends along the circumferential direction of the pipe body; the thicknesses of the two ends of the cross-section are different along the radial direction of the pipe body.

[0012] In a possible implementation, the cross-section has a first end and a second end along the circumferential direction of the pipe body, and the thickness of the first end of the cross-section along the radial direction of the pipe body is greater than the thickness of the second end of the cross-section along the radial direction of the pipe body;

[0013] In a cross-section perpendicular to the extending direction of the pipe body, the first ends of multiple cross-sections are located on the front side in the left-handed direction of the flow guiding member.

[0014] In a possible implementation, on the side wall of the pipe body corresponding to the first end of the cross-section, a through hole is provided in a direction perpendicular to the extending direction of the pipe body, and the through hole is communicated with the opening.

[0015] In a possible implementation, the welding auxiliary device includes a housing; the housing is sleeved outside the pipe body, and an annulus space is formed between the housing and the pipe body;

[0016] The air flow flowing out through the opening forms the air wall at the annulus space and is guided to the gap through the flow guiding member.

[0017] In a possible implementation, the pipe body is provided with a second channel, and the second channel forms the air guiding structure;

[0018] And / or, the welding auxiliary device includes an air guiding pipe, and the air guiding pipe forms the air guiding structure.

[0019] In a possible implementation, a welding device is provided at the pipe body.

[0020] In a second aspect, an embodiment of the present application provides a welding method, which uses the above-mentioned welding auxiliary device; the welding method includes:

[0021] Placing a first workpiece to be welded at the welding auxiliary device so that a gap is formed between the first workpiece to be welded and the first end of the pipe body;

[0022] Placing at least a part of a second workpiece to be welded in the gap;

[0023] Filling gases into the first channel and the air guiding structure respectively through a gas supply device;

[0024] Welding the second workpiece to be welded on the first workpiece to be welded through the welding device.

[0025] The welding auxiliary device and welding method provided by the embodiments of the present application form a gap between the first end of the pipe body and the first workpiece to be welded, and form a cyclone wind wall around the gap through the cooperation of the first channel on the pipe body and the flow guide member, so that the gap is within the wind eye range of the wind wall. When at least part of the second workpiece to be welded is placed in the gap for welding, since the gap is within the wind eye range of the wind wall, the wind speed in the gap is zero. When the shielding gas is transported into the gap, the gas flow of the shielding gas is more stable, so that the shielding gas in the gap can have a stable concentration, thereby improving the quality of the weld seam. Description of the Drawings

[0026] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments in line with the present application, and are used together with the specification to explain the principles of the present application.

[0027] Figure 1 Schematic diagram of the clamping and positioning assembly provided by some embodiments of the present application for clamping and positioning the first workpiece to be welded;

[0028] Figure 2 Schematic diagram of the welding operation by the laser welding device provided by some embodiments of the present application;

[0029] Figure 3 Top view of the welding auxiliary device provided by some embodiments of the present application;

[0030] Figure 4 Front view of the pipe body provided by some embodiments of the present application;

[0031] Figure 5 Schematic diagram of the pipe body provided by some embodiments of the present application with the flow guide member hidden;

[0032] Figure 6 For Figure 4 Top view of the pipe body in

[0033] Figure 7 For Figure 4 Cross-sectional view of the pipe body in the A-A direction in

[0034] Figure 8 Cross-sectional view of the welding auxiliary device provided by some embodiments of the present application in which the gas guiding structure only includes the second channel;

[0035] Figure 9 Cross-sectional view of the welding auxiliary device provided by some embodiments of the present application in which the gas guiding structure only includes the gas guiding pipe;

[0036] Figure 10 Cross-sectional view of the welding auxiliary device provided by some embodiments of the present application in which the gas guiding structure includes the second channel and the gas guiding pipe;

[0037] Figure 11 This is a schematic flow chart of the welding method provided by some embodiments of the present application.

[0038] Reference numerals:

[0039] 10, welding auxiliary equipment; 20, laser welding device; 30, clamping and positioning assembly; 40, first workpiece to be welded; 100, pipe body; 110, first channel; 111, opening; 120, flow guiding member; 121, cross section; 122, through hole; 130, third channel; 200, gap; 300, housing; 310, annulus space; 320, discharge port; 400, gas guiding structure; 410, second channel; 411, first air outlet; 412, guiding surface; 420, gas guide pipe; 421, second air outlet.

[0040] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and the written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Description of Specific Embodiments

[0041] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0042] Currently, laser welding is generally used for welding power batteries. During the laser welding process, a shielding gas is blown into the welding area. The shielding gas will affect the weld formation, weld quality, weld penetration, and weld width. In most cases, blowing in the shielding gas has a beneficial effect on the weld.

[0043] When the aluminum shell cover of the current lithium battery is welded to the top cover of the battery cell, the shielding gas is directly discharged into the air, which is bound to cause energy waste and low efficiency. Moreover, the direct discharge into the air makes the gas flow of the shielding gas unstable, which easily leads to poor welding.

[0044] Based on the above, in the embodiments of the present application, a welding auxiliary device and a welding method are provided. By forming a gap 200 between the first end of the pipe body 100 and the first workpiece to be welded 40, and by the cooperation of the first channel 110 and the flow guide member 120 on the pipe body 100 to form a cyclone wind wall around the gap 200, the gap 200 is within the wind eye range of the wind wall. When at least a part of the second workpiece to be welded is placed in the gap 200 for welding, since the gap 200 is within the wind eye range of the wind wall, the wind speed in the gap 200 is zero. When the shielding gas is delivered into the gap 200, the gas flow of the shielding gas is more stable, so that the shielding gas in the gap 200 can have a stable concentration, thereby improving the quality of the weld seam.

[0045] Next, specific embodiments will be used to describe in detail the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems. These several specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. Next, the embodiments of the present application will be described with reference to the accompanying drawings.

[0046] In the first aspect, as Figures 4 - 10 shown, an embodiment of the present application provides a welding auxiliary device 10, which is used to assist in welding a first workpiece to be welded 40 and a second workpiece to be welded. The welding auxiliary device 10 includes a pipe body 100. Among them, the first end of the pipe body 100 faces the first workpiece to be welded 40, and there is no direct contact between the first end of the pipe body 100 and the first workpiece to be welded 40, so that a gap 200 can be formed between the first end of the pipe body 100 and the first workpiece to be welded 40; at least a part of the second workpiece to be welded can be placed in the gap 200. Specifically, the part of the second workpiece to be welded with the first workpiece to be welded 40 is placed in the gap 200, so that the welding operation is carried out in the gap 200.

[0047] Furthermore, a first channel 110 is provided inside the pipe body 100. The first channel 110 can be connected to a gas supply device outside the pipe body 100 through a pipeline, and the first channel 110 is provided with an opening 111 on the circumferential side wall of the pipe body 100, so that the opening 111 can communicate the first channel 110 with the outside of the pipe body 100. When the gas supply device fills the first channel 110 with gas, the gas can flow out from the circumferential side wall of the pipe body 100 through the opening 111. Specifically, the gas filled into the first channel 110 by the gas supply device is compressed gas. A flow guide member 120 is provided on the circumferential outer side wall of the pipe body 100. When the gas in the first channel 110 flows out through the opening 111, the flow guide member 120 can guide the gas flowing out from the opening 111 to the gap 200 and make the gas form a wind wall around the gap 200, and the gap 200 is within the wind eye range of the wind wall, so that the welding operation is also within the wind eye range of the wind wall.

[0048] The welding auxiliary device 10 of the embodiment of the present application further includes a gas guiding structure 400, which can also be connected to a gas supply device outside the pipe body 100, and the air outlet of the gas guiding structure 400 faces the gap 200. It can be understood that, generally in welding operations, it is often necessary to blow protective gas to the weld. Therefore, in the embodiment of the present application, the protective gas is provided to the gas guiding structure 400 by the gas supply device, so that the gas guiding structure 400 can send the protective gas into the gap 200, and then the protective gas can act on the weld between the first workpiece to be welded 40 and the second workpiece to be welded.

[0049] It can be understood that since the air wall can isolate the gap 200 from the external environment to a certain extent, it can prevent dust, water vapor, etc. from entering the gap 200, and can preferably ensure the stability of the welding operation in the gap 200. At the same time, since the wind speed within the wind eye range of the air wall is zero, the wind speed of the gap 200 within the wind eye range of the air wall is zero, so that the gap 200 can provide a stable welding environment for the first workpiece to be welded 40 and the second workpiece to be welded, and can preferably improve the stability and safety of welding. Further, since the wind speed of the gap 200 is zero, when the gas guiding structure 400 sends the protective gas into the gap 200, the protective gas in the gap 200 can have a better concentration, thereby improving the quality of the weld and the welding quality between the first workpiece to be welded 40 and the second workpiece to be welded.

[0050] It is worth mentioning that when blowing the protective gas into the gap 200 through the gas guiding structure 400, since a certain amount of welding slag will be generated during the process of welding the first workpiece to be welded 40 and the second workpiece to be welded, the protective gas can blow the welding slag and blow the welding slag into the air wall, so that the air wall can take the welding slag away from the gap 200 and prevent the welding slag from affecting the weld quality between the first workpiece to be welded 40 and the second workpiece to be welded. Of course, during the whole process of sending the protective gas into the gap 200, the protective gas can clean the gap 200, so that the gap 200 can be kept clean to a certain extent, thereby effectively improving the weld quality between the first workpiece to be welded 40 and the second workpiece to be welded.

[0051] Further, the gas filled into the first channel 110 by the gas supply device can also be a protective gas, and no special limitation is made thereto. It can be understood that, according to different welding objects, the specific components of the protective gas are also different, and can be selected according to the actual needs during welding. However, it should be noted that the protective gas should be a gas that is beneficial to the formation of the weld and can improve the weld quality.

[0052] In some embodiments, in combination with Figure 4As shown, the flow guiding member 120 provided on the circumferential outer wall of the pipe body 100 has a spiral structure. Specifically, the flow guiding member 120 extends along the circumferential direction of the pipe body 100 and the extending direction of the pipe body 100, wherein the extending direction of the pipe body 100 is the length direction of the pipe body 100 towards the first workpiece to be welded 40. Specifically, the extending direction of the pipe body 100 is along the Y-axis. It can be understood that when the gas in the first channel 110 flows out from the opening 111, the flowing out gas will contact the flow guiding member 120. According to the Coanda effect, the gas will bend along the streamline of the object surface. Therefore, the gas flowing out from the opening 111 will rotate in the circumferential direction of the pipe body 100 along the curved surface of the flow guiding member 120 and be guided by the flow guiding member 120 towards the first workpiece to be welded 40. Thus, the gas flowing out from the opening 111 can form a cyclone-shaped air wall around the gap 200.

[0053] Furthermore, since the gas flowing out from the opening 111 adheres to the outer surface of the guiding member, the formed air wall can adhere to the circumferential outer wall of the pipe body 100, resulting in a better gathering effect on the formed air wall, improving the stability of the formed air wall, and further effectively ensuring the stability of the concentration of the shielding gas in the gap 200.

[0054] It can be understood that when the welding slag generated during the welding operation is blown towards the air wall by the shielding gas, since the air wall is composed of spirally flowing gas, it can preferably carry the welding slag away from the gap 200.

[0055] Furthermore, the number of openings 111 provided on the circumferential side wall of the pipe body 100 is multiple, and the number of flow guiding members 120 provided on the circumferential outer wall of the pipe body 100 is multiple, and each flow guiding member 120 corresponds to at least one opening 111. Since the gas flowing out from the multiple openings 111 is multiple strands, and each strand of gas forms a spiral shape under the guidance of the flow guiding member 120, the stability of the air wall formed by the convergence of the multiple strands of gas is higher. Correspondingly, each strand of gas adheres to the corresponding flow guiding member 120, so the gathering effect of the air wall can be improved.

[0056] In some embodiments, the normal direction of the flow guiding member 120 faces the first workpiece to be welded 40, and the spiral line of the flow guiding member 120 is left-handed. Therefore, the gas flowing out from the opening 111 can form an air wall and be guided by the flow guiding member 120 to the gap 200, so that the gap 200 is within the eye of the air wall.

[0057] In some embodiments, in combination with Figure 4 and Figure 7As shown, in a direction perpendicular to the extending direction of the pipe body 100, the flow guide member 120 has a cross-section 121. Among them, the cross-section 121 is in an airfoil shape. Specifically, in the circumferential direction of the pipe body 100, the cross-section 121 has two ends, and in the radial direction of the pipe body 100, the thicknesses of the two ends of the cross-section 121 are different.

[0058] It should be noted that the flow guide member 120 in the embodiment of the present application can play a certain role in gathering the formed air wall. Taking one flow guide member 120 as an example, when the gas in the first channel 110 flows out from the opening 111, the gas can first flow to the end with a thinner thickness of the cross-section 121, and then flow along the surface of the flow guide member 120 to the end with a thicker thickness of the cross-section 121, and further form an air wall on the circumferential outer wall of the pipe body 100, so that the formed air wall can fit the pipe body 100 more closely.

[0059] In some embodiments, in the circumferential direction of the pipe body 100, the two ends of the cross-section 121 are respectively a first end and a second end. Among them, in the radial direction of the pipe body 100, the thickness of the first end of the cross-section 121 is greater than the thickness of the second end of the cross-section 121, so that the gas flowing out from the opening 111 first contacts the second end of the cross-section 121, and then flows along the outer wall of the flow guide member 120 towards the direction of the first end of the cross-section 121. Further, while forming an air wall, it can play a role in gathering the air wall.

[0060] Furthermore, since the number of the flow guide members 120 provided on the pipe body 100 is multiple, therefore, in the embodiment of the present application, in a cross-section perpendicular to the extending direction of the pipe body 100, there are multiple cross-sections 121, and the first ends of the multiple cross-sections 121 are all located on the front side of the left-handed direction of the flow guide member 120, as Figure 6 and Figure 7 shown.

[0061] It is worth mentioning that by setting the first ends of the multiple cross-sections 121 to have the same orientation, the flow direction of the gas flowing out from the opening 111 under the guidance of the flow guide member 120 is kept consistent, avoiding the interference of multiple gas flows flowing out from different openings 111 and affecting the formation of the air wall and the quality of the formed air wall.

[0062] In some embodiments, as shown in combination with Figure 4 、 Figure 6 and Figure 7 shown, the gas in the first channel 110 flows out from the outer wall of the flow guide member 120. Specifically, through holes 122 are formed on the outer wall of the flow guide member 120, and the through holes 122 are communicated with the openings 111 formed on the circumferential side wall of the pipe body 100.

[0063] Further, in a direction perpendicular to the extending direction of the pipe body 100, a through hole 122 is provided at the first end of the cross-section 121 of the flow guide member 120, that is, the through hole 122 is provided on the outer side wall of the flow guide member 120 corresponding to the first end of the cross-section 121. It should be noted that when the number of the flow guide members 120 is multiple, the first ends of the multiple cross-sections 121 are all located at the front side of the left-handed direction of the flow guide member 120. Therefore, the orientations of the through holes 122 provided on the flow guide member 120 can all face the second end of the cross-section 121 of another flow guide member 120. When the gas in the first channel 110 flows out from the opening 111, the gas will first enter the through hole 122, and then be blown towards the second end of the cross-section 121 of another flow guide member 120 through the through hole 122. Furthermore, the gas then flows along the outer side wall of the flow guide member 120 towards the direction of the first end of the cross-section 121. Thus, while forming a wind wall, it can have an effect of gathering the wind wall.

[0064] It is worth mentioning that since the through hole 122 directly faces the second end of the cross-section 121 of another flow guide member 120, when the gas flows out from the through hole 122, it can directly flow along the outer side wall of the flow guide member 120 without bending, which can improve the stability and conformity of the gas flow along the outer side wall of the flow guide member 120. Furthermore, the stability of the formed wind wall is higher, and the gathering effect of the wind wall is better.

[0065] In some embodiments, as shown in Figures 2 - 3 and Figures 8 - 10 the welding auxiliary device 10 includes a housing 300, and the housing 300 is sleeved outside the pipe body 100, and an annular space 310 is formed between the housing 300 and the pipe body 100. When the gas flows out from the through hole 122, under the guidance of the multiple flow guide members 120, the gas can form a cyclone-type wind wall in the annular space 310. At the same time, under the guidance of the multiple flow guide members 120, the wind wall can be guided to the gap 200, so that the gap 200 is within the wind eye range of the wind wall.

[0066] It can be understood that since the housing 300 is sleeved outside the pipe body 100 and the wind wall is formed in the annular space 310 between the housing 300 and the pipe body 100, the housing 300 is equivalent to being sleeved outside the formed wind wall, so that the housing 300 can have a certain gathering effect on the wind wall, avoiding the diffusion of the wind wall in the radial direction of the pipe body 100, improving the stability of the formed wind wall, and under the gathering effect of the housing 300, making the wind wall more conform to the circumferential outer side wall of the pipe body 100, and making the wind wall closer to the gap 200, thereby ensuring the stability of welding in the gap 200 and improving the welding quality.

[0067] It is worth mentioning that when welding the first workpiece to be welded 40 and the second workpiece to be welded in the gap 200, a shielding gas is fed into the gap 200, and the shielding gas can blow the welding slag generated during welding towards the air wall, so that the welding slag can move along with the air wall. Combining Figure 3 and Figure 6 as shown, where Figure 3 the dashed arrow in is the rotation direction of the cyclone air wall, Figure 6 and the solid arrow in is the rotation direction of the cyclone air wall. Since the rotating air wall has a tendency to spread in the radial direction of the pipe body 100 during rotation, the air wall will drive the welding slag to move away from the pipe body 100 in the radial direction of the pipe body 100, so that the welding slag will contact the housing 300, enabling the housing 300 to limit the welding slag, and then the welding slag can fall along the housing 300 and be collected.

[0068] Furthermore, combining Figure 2 and Figures 8 - 10 as shown, the housing 300 in the embodiment of the present application has a first end away from the gap 200, where the first end of the housing 300 is in a gradually converging state, that is, in the radial direction of the pipe body 100, the distance between the first end of the housing 300 and the pipe body 100 is getting closer and closer. It can be understood that since the housing 300 is located outside the annulus space 310, when an air wall is formed in the annulus space 310, the housing 300 can block the air wall, and the first end of the housing 300 is in a gradually converging trend, so that after the air wall contacts the housing 300, the housing 300 can guide the air wall, enabling the air wall to move along the first end of the housing 300, and then the air wall gradually approaches the pipe body 100, realizing the gathering of the air wall. While improving the stability of the air wall, it can also improve the stability of the air eye of the air wall, and then can preferably keep the wind speed in the gap 200 at zero. Further, since the air wall in the annulus space 310 is more gathered under the action of the first end of the housing 300, the wind speed of the air wall around the gap 200 can be faster and more powerful. Therefore, when the shielding gas blows the welding slag in the gap 200 towards the air wall, the air wall can drive the welding slag to move quickly and powerfully to effectively take away the welding slag and avoid affecting the welding between the first workpiece to be welded 40 and the second workpiece to be welded.

[0069] Furthermore, the housing 300 and the pipe body 100 can be in contact or non-contact. When the housing 300 and the pipe body 100 are in contact, the first end of the housing 300 can be fixedly connected to the pipe body 100 so that the housing 300 and the pipe body 100 form an integral structure. When the housing 300 and the pipe body 100 are in non-contact, the housing 300 can be kept sleeved outside the pipe body 100.

[0070] Further, in combination with Figures 2 - 3 As shown, a discharge port 320 is further provided on the circumferential outer wall of the housing 300. The discharge port 320 penetrates through the housing 300 and communicates with the annulus space 310. It can be understood that under the mutual cooperation of the shielding gas and the air wall, the air wall can bring the welding slag into the annulus space 310. Further, under the action of the air wall, the welding slag will move to contact the housing 300, so that the welding slag can be collected on the housing 300. At the same time, the welding slag will also move on the housing 300 following the air wall. When the welding slag moves to the discharge port 320, the welding slag can be discharged outside the housing 300 through the discharge port 320, thereby preventing the welding slag from staying in the annulus space 310 all the time and avoiding the welding slag from affecting the flow of the gas in the annulus space 310.

[0071] In some embodiments, in combination with Figures 6 - 8 and Figure 10 As shown, a second channel 410 is formed in the pipe body 100. Among them, the second channel 410 has a first air outlet 411, and the first air outlet 411 faces the gap 200. In the embodiment of the present application, the second channel 410 forms the above-mentioned air guiding structure 400. The second channel 410 can be connected to a gas supply device, and the gas supply device provides shielding gas for the second channel 410, and then the second channel 410 transports the shielding gas to the gap 200.

[0072] Further, in combination with Figure 9 and Figure 10 As shown, the welding auxiliary device 10 in the embodiment of the present application further includes an air guide pipe 420. Among them, the air guide pipe 420 has a second air outlet 421, and the second air outlet 421 faces the gap 200. The air guide pipe 420 also serves as the above-mentioned air guiding structure 400. The air guide pipe 420 can be connected to a gas supply device, and the gas supply device provides shielding gas for the air guide pipe 420, and then the air guide pipe 420 transports the shielding gas to the gap 200.

[0073] It can be understood that in the actual application process, the air guiding structure 400 may include at least one of the second channel 410 and the air guide pipe 420 to realize the transportation of the shielding gas to the gap 200.

[0074] It should be noted that when the air guiding structure 400 includes the second channel 410, the first air outlet 411 of the second channel 410 is opened on the end face of the first end of the pipe body 100. Further, a guiding surface 412 is provided at the first air outlet 411. As Figure 8 and Figure 10 As shown, during the process of the second channel 410 transporting the shielding gas to the gap 200, the guiding surface 412 can guide the shielding gas to flow towards the center of the gap 200, so that the shielding gas can better act on the weld between the first workpiece to be welded 40 and the second workpiece to be welded, thereby improving the quality of the weld.

[0075] In some embodiments, a welding device is provided at the pipe body 100. The welding device can be an arc welding device, a laser welding device 20, a gas welding device, etc. according to the actual welding requirements, and no special limitation is made thereto.

[0076] It should be noted that since the first workpiece to be welded 40 and the second workpiece to be welded in the embodiment of the present application are welded within the range of the gap 200, the welding device can be arranged at the first end of the pipe body 100 so that the welding device can directly weld the first workpiece to be welded 40 and the second workpiece to be welded in the gap 200. Of course, the welding device can also be arranged at any position of the pipe body 100 as long as it can weld the first workpiece to be welded 40 and the second workpiece to be welded in the gap 200, and no special limitation is made thereto.

[0077] Furthermore, as Figure 2 shown, the welding device in the embodiment of the present application is the laser welding device 20. The laser emitted by the laser welding device 20 acts on the first workpiece to be welded 40 and the second workpiece to be welded, thereby realizing the welding of the first workpiece to be welded 40 and the second workpiece to be welded.

[0078] Furthermore, when the welding device in the embodiment of the present application is the laser welding device 20, the laser welding device 20 can be arranged at the second end of the pipe body 100 far from the first workpiece to be welded 40. Specifically, there is a certain distance between the laser welding device 20 and the second end of the pipe body 100. A third channel 130 is formed in the pipe body 100. As Figure 3 、 Figures 6 - 10 shown, wherein the third channel 130 penetrates through the pipe body 100, one end of the third channel 130 faces the laser welding device 20, and the other end of the third channel 130 communicates with the gap 200, so that the laser emitted by the laser welding device 20 can enter the gap 200 through the third channel 130, and the laser can act on the first workpiece to be welded 40 and the second workpiece to be welded, thereby realizing the welding of the first workpiece to be welded 40 and the second workpiece to be welded.

[0079] Furthermore, in combination with Figures 1 - 2As shown, the welding auxiliary device 10 in the embodiment of the present application further includes a clamping and positioning assembly 30. The clamping and positioning assembly 30 can adopt common devices with clamping and positioning functions. For example, the clamping and positioning assembly 30 can include a motor and two clamping plates. By driving the movement of at least one clamping plate through the motor, the two clamping plates can approach each other. When the first workpiece to be welded 40 is placed between the two clamping plates, the two clamping plates can clamp and position the first workpiece to be welded 40, thereby improving the stability of the position of the first workpiece to be welded 40, so that the first workpiece to be welded 40 will not shift during the welding process, which is convenient for improving the welding quality. Of course, according to the needs of actual application, the clamping and positioning assembly 30 can also clamp and position the second workpiece to be welded, and no special limitation is made thereto.

[0080] Secondly, in combination with Figure 11 As shown, the embodiment of the present application provides a welding method. The use of this welding method relies on the above-mentioned welding auxiliary device 10. Therefore, it can have the corresponding technical effects and advantages as described above.

[0081] Taking the laser welding device 20 arranged at the second end of the pipe body 100 as an example, the welding method specifically includes:

[0082] Step S100: Place the first workpiece to be welded 40 at the welding auxiliary device 10 to form a gap 200 between the first workpiece to be welded 40 and the first end of the pipe body 100.

[0083] In this step, first, the first workpiece to be welded 40 is fixed by the clamping and positioning assembly 30, and then the relative positions of the laser welding device 20 and the welding auxiliary device 10 are adjusted so that the laser emitted by the laser welding device 20 can enter the third channel 130. After that, the laser welding device 20 and the welding auxiliary device 10 are integrally moved to the position corresponding to the first workpiece to be welded 40, that is, the first workpiece to be welded 40 is placed at the welding auxiliary device, so that there is a spaced arrangement between the welding auxiliary device 10 and the first workpiece to be welded 40, thereby forming a gap 200 between the first end of the pipe body 100 and the first workpiece to be welded 40.

[0084] Step S200: Place at least part of the second workpiece to be welded in the gap 200.

[0085] In this step, the position of the second workpiece to be welded that needs to be welded with the first workpiece to be welded 40 is placed in the gap 200, so that the position of the second workpiece to be welded that needs to be welded corresponds to the first workpiece to be welded 40.

[0086] Step S300: Fill the first channel 110 and the air guiding structure 400 with gas through the gas supply device.

[0087] In this step, first, a compressed gas is filled into the first channel 110 through a gas supply device, so that a cyclone-shaped air wall can be formed around the gap 200, and the gap 200 is within the eye of the air wall. Then, a protective gas is filled into the gas guiding structure 400 through the gas supply device, so that the gas guiding structure 400 can deliver the protective gas to the gap 200.

[0088] Step S400: Weld the second workpiece to be welded on the first workpiece 40 through a welding device.

[0089] In this step, since the welding device is a laser welding device 20, first start the laser welding device 20, so that the laser emitted by the laser welding device 20 can enter the gap 200 through the third channel 130 of the pipe body 100, and then the laser can act on the first workpiece 40 and the second workpiece to be welded, thereby realizing the welding of the first workpiece 40 and the second workpiece to be welded.

[0090] Finally, it should be noted that: After considering the specification and practicing the invention disclosed herein, those skilled in the art will easily think of other embodiments of the present invention. The present invention is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed in the present invention. It is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A welding auxiliary device for assisting in welding a first workpiece to be welded (40) and a second workpiece to be welded, characterized in that, The welding auxiliary device (10) includes: A tube body (100), a first end in the extending direction of the tube body (100) is used to face the first workpiece to be welded (40), and a gap (200) is formed between the tube body (100) and the first workpiece to be welded (40), and at least a part of the second workpiece to be welded is placed in the gap (200); a first channel (110) is provided inside the tube body (100), an opening (111) is provided on the circumferential side wall of the tube body (100), the opening (111) communicates the first channel (110) and the outside of the tube body (100), and the first channel (110) is communicated with a gas supply device; the air flow in the first channel (110) flows out through the opening (111), and a wind wall is formed at the gap (200), and the gap (200) is within the range of the eye of the wind wall; A gas guiding structure (400), which is communicated with the gas supply device, and an air outlet of the gas guiding structure (400) faces the gap (200).

2. The welding auxiliary device according to claim 1, characterized in that: The welding auxiliary device includes a flow guiding member (120) provided on the circumferential outer side wall of the tube body (100); the air flow in the first channel (110) flows out through the opening (111), and is guided by the flow guiding member (120) to the gap (200) to form a wind wall.

3. The welding auxiliary device according to claim 2, wherein: The flow guiding member (120) extends along the circumferential direction and the extending direction of the tube body (100); the number of the flow guiding members (120) is multiple, and the multiple flow guiding members (120) are arranged at intervals along the circumferential direction of the tube body (100).

4. The welding auxiliary device according to claim 3, wherein: The flow guiding member (120) has a cross section (121), and the cross section (121) is perpendicular to the extending direction of the tube body (100); The cross section (121) is in an airfoil shape and has two ends along the circumferential direction of the tube body (100); the thicknesses of the two ends of the cross section (121) in the radial direction of the tube body (100) are different.

5. The welding auxiliary device according to claim 4, characterized in that: The cross section (121) has a first end and a second end along the circumferential direction of the tube body (100), and the thickness of the first end of the cross section (121) in the radial direction of the tube body (100) is greater than the thickness of the second end of the cross section (121) in the radial direction of the tube body (100); In a cross section perpendicular to the extending direction of the tube body (100), the first ends of the multiple cross sections (121) are on the front side in the left-handed direction of the flow guiding member (120).

6. The welding auxiliary device according to claim 5, characterized in that: In a direction perpendicular to the extending direction of the tube body (100), a through hole (122) is provided on the side wall of the tube body (100) corresponding to the first end of the cross section (121), and the through hole (122) is communicated with the opening (111).

7. The welding auxiliary device according to claim 2, characterized in that: The welding auxiliary device (10) includes a housing (300); the housing (300) is sleeved outside the tube body (100), and an annular space (310) is formed between the housing (300) and the tube body (100); The air flow flowing out through the opening (111) forms the wind wall at the annular space (310), and is guided by the flow guiding member (120) to the gap (200).

8. The welding auxiliary device according to claim 1, wherein: The pipe body (100) is provided with a second channel (410), and the second channel (410) forms the air guiding structure (400); And / or, the welding auxiliary device (10) includes an air guiding pipe (420), and the air guiding pipe (420) forms the air guiding structure (400).

9. The welding auxiliary device according to claim 1, wherein: A welding device is provided at the pipe body (100).

10. A welding method, characterized in that: The welding auxiliary device (10) according to any one of claims 1-9 is adopted; the welding method includes: Placing a first workpiece to be welded (40) at the welding auxiliary device (10) to form a gap (200) between the first workpiece to be welded (40) and the first end of the pipe body (100); Placing at least a part of the second workpiece to be welded in the gap (200); Filling gases into the first channel (110) and the air guiding structure (400) respectively through a gas supply device; Welding the second workpiece to be welded on the first workpiece to be welded (40) through the welding device.

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