welding equipment

Abstract

The present invention provides a welding device, which includes: a static shoulder, the static shoulder including a discharge channel arranged along the circumferential direction and a through hole arranged along the axial direction, one end of the discharge channel is connected to the through hole, and the other end extends to the outer surface of the static shoulder; a stirring piece, the stirring piece is inserted into the through hole, and the stirring piece can rotate relative to the static shoulder. During the process of welding a workpiece by the welding device of the present invention, as the stirring piece rotates, the welding material sandwiched between the through hole of the static shoulder and the stirring piece will be discharged from the welding device along the discharge channel under the action of centrifugal force, so that the welding material will not accumulate in the gap between the through hole of the static shoulder and the stirring piece, reducing the resistance of the stirring piece during operation, and ensuring the welding efficiency of the welding device. At the same time, since the discharge channel is arranged along the circumferential direction, that is, the distribution structure of the discharge channel is reasonably limited. That is, the rotation direction of the stirring piece is matched with the extension direction of the discharge channel, which is conducive to improving the discharge efficiency of the welding material.

Description

Technical Field

[0001] The present invention relates to the technical field of welding devices, and in particular to a welding device. Background Art

[0002] Nowadays, friction stir welding is widely used in the fields of aerospace industry, new energy vehicles, power locomotives, communications, etc. During friction stir welding, the welding material will enter the gap between the static shoulder and the stirring piece, which greatly affects the welding efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, one aspect of the present invention provides a welding device.

[0005] In view of this, one aspect of the present invention proposes a welding device comprising: a static shoulder, the static shoulder comprising a discharge channel arranged along the circumferential direction and a through hole arranged along the axial direction, one end of the discharge channel is connected to the through hole, and the other end extends to the outer surface of the static shoulder; a stirring member, the stirring member is inserted into the through hole, and the stirring member can rotate relative to the static shoulder.

[0006] The present invention provides a welding device comprising a stationary shoulder and a stirring member. The stationary shoulder includes a discharge channel and a through-hole. The discharge channel is arranged circumferentially, and the through-hole is arranged axially. One end of the discharge channel is connected to the through-hole, and the other end extends to the outer surface of the stationary shoulder. The stirring member is connected to a drive shaft of a driving member, which drives the stirring member to rotate via the drive shaft. The stationary shoulder is connected to the non-rotating portion of the driving member. During operation, the high-speed rotation of the stirring member causes the stirring member to rub against the workpiece to be welded, thereby raising the temperature of the workpiece to be welded and softening it, thereby frictionally stirring the workpiece to complete the welding. Since the stationary shoulder is connected to the non-rotating portion of the driving member, it does not rotate. During the welding process, as the stirring member rotates, welding material trapped between the through-hole of the stationary shoulder and the stirring member is discharged from the welding device along the discharge channel under the action of centrifugal force. This prevents the welding material from accumulating in the gap between the through-hole of the stationary shoulder and the stirring member, reducing the resistance of the stirring member during operation and ensuring the welding efficiency of the welding device.

[0007] At the same time, the circumferential arrangement of the discharge channels effectively defines their distribution structure. Specifically, the rotational direction of the stirring element aligns with the extension direction of the discharge channels, thereby reducing resistance to the welding material between the through-hole of the static shoulder and the stirring element as it exits the welding device along the discharge channels. This improves the efficiency of welding material discharge.

[0008] Specifically, the discharge channel is arranged along the circumferential direction of the stirring member, and the through hole is arranged along the axial direction of the stirring member.

[0009] The welding device according to the present invention may also have the following additional technical features:

[0010] In the above technical solution, further, the discharge channel is arranged in a spiral shape.

[0011] In this technical solution, the structure of the discharge channel is rationally arranged to form a spiral arrangement, which facilitates the smooth discharge of welding material from the welding device under the action of centrifugal force. The spiral arrangement also has the advantages of easy processing and low production cost.

[0012] In any of the above technical solutions, further, the spiral direction of the discharge channel is the same as the rotation direction of the stirring element.

[0013] In this technical solution, the structure of the discharge channel is reasonably set so that the spiral direction of the discharge channel is the same as the rotation direction of the stirring element. In this way, when the stirring element rotates relative to the static shoulder, the resistance of the welding material between the static shoulder and the stirring element to discharge the welding device along the discharge channel is reduced, which facilitates the discharge of the welding material and helps to improve the efficiency of the welding material discharge.

[0014] In any of the above technical solutions, further, a first opening of one end of the discharge channel communicating with the through hole is smaller than a second opening of the discharge channel extending to the surface of the static shoulder.

[0015] In this technical solution, the discharge channel is structured so that the first opening at one end of the discharge channel, which connects to the through-hole, is smaller than the second opening extending from the discharge channel to the surface of the static shoulder. This means that the weld material between the static shoulder through-hole and the stirring element flows through the first opening to the second opening, and then out of the welding device. The second opening is larger than the first opening, which increases the angle and area of ​​the weld material discharge, thereby improving the efficiency of the weld material discharge.

[0016] In any of the above technical solutions, further, the flow cross-sectional area of ​​the discharge channel gradually increases from the first opening to the second opening.

[0017] In this technical solution, the cross-sectional area of ​​the discharge channel gradually increases from the first opening to the second opening, that is, the discharge channel is arranged in a fan shape. This arrangement, through the rational arrangement of the discharge channel structure, ensures that the discharge angle of the discharge channel gradually increases from the first opening to the second opening, and the discharge area of ​​the discharge channel gradually increases. This reduces the resistance of the welding material to discharge from the welding device along the discharge channel, facilitates the discharge of the welding material, and helps improve the discharge efficiency of the welding material.

[0018] In any of the above technical solutions, further, the discharge channel includes: a first sub-channel, a first opening is provided in the first sub-channel, and the first sub-channel is a columnar structure; a second sub-channel, the second sub-channel is connected to the first sub-channel, and the second opening is provided in the second sub-channel; wherein, from the first opening to the second opening, the flow cross-sectional area of ​​the second sub-channel gradually increases.

[0019] In this technical solution, the discharge channel includes a first sub-channel and a second sub-channel, the first sub-channel being connected to the second sub-channel, the first opening being provided in the first sub-channel, and the second opening being provided in the second sub-channel. That is, the first sub-channel is arranged in a columnar shape, and the second sub-channel is arranged in a fan-shaped shape. The welding material between the through-hole of the static shoulder and the stirring member passes through the first sub-channel and the second sub-channel in sequence, and then is discharged from the welding device. This arrangement, by rationally arranging the structure of the discharge channel, causes the discharge angle of the second sub-channel to gradually increase from the first opening to the second opening, and the discharge area of ​​the second sub-channel to gradually increase. This reduces the resistance of the welding material to discharge from the welding device along the discharge channel, facilitates the discharge of the welding material, and helps improve the discharge efficiency of the welding material.

[0020] In any of the above technical solutions, further, the discharge channel is sectioned along the axis perpendicular to the static shoulder, and in the section, the contour line of the discharge channel includes any one of the following or a combination thereof: a straight line, a curve, and a broken line.

[0021] In this technical solution, the structure of the discharge channel can be specifically configured according to actual conditions, so that when the discharge channel is cross-sectioned along the axis perpendicular to the static shoulder, the contour line of the discharge channel in the cross-section includes any of the following or a combination thereof: a straight line, a curve, and a broken line. For example, the contour line of the discharge channel includes a straight line, another example, the contour line of the discharge channel includes a straight line and a curve, another example, the contour line of the discharge channel includes a curve, and so on. The examples are not listed here one by one.

[0022] In any of the above technical solutions, further, the static shaft shoulder includes: a conical section, and the stirring head of the stirring element passes through the conical section and protrudes from the static shaft shoulder; wherein, the discharge channel is at least partially located in the conical section.

[0023] In this technical solution, the static shaft shoulder includes a conical section, and the stirring head of the stirring member passes through the conical section and protrudes from the static shaft shoulder. During welding, the conical section acts on the workpiece to be welded, and has the function of pressing the workpiece to be welded and the welding material to ensure the effective combination of the workpiece to be welded and the welding material, thereby ensuring the welding quality.

[0024] In addition, the static shoulder includes a tapered section, which helps reduce its volume and overall weight while maintaining its structural strength. This allows the static shoulder to stir the base metal within a narrow range at the same weld depth, concentrating the heat output. This allows for a higher rotational speed of the stirring element, minimizes welding flash, and creates a narrow, aesthetically pleasing weld seam. This configuration enables the welding apparatus to be used for welding thin sheet metal. Due to the static shoulder's narrow thermal range and narrow weld seam, the probability of collapsing thin-walled sheet metal is reduced, while eliminating the need for post-weld flash and burr removal.

[0025] In any of the above technical solutions, the welding device further includes: an outer cover connected to the static shoulder; wherein the outer cover is arranged on the peripheral side of the stirring member.

[0026] In this technical solution, the welding device also includes an outer cover. The outer cover is connected to the static shoulder by providing a mating structure between the outer cover and the static shoulder, and the outer cover is disposed around the side of the stirring element. The outer cover is connected to the non-rotating portion of the driving element of the welding device. In other words, the static shoulder is connected to the driving element of the welding device via the outer cover. The outer cover also protects the stirring element located therein, preventing dirt, impurities, etc. from entering the stirring element and causing it to malfunction.

[0027] Furthermore, the outer cover is connected to the static shoulder, which helps to shorten the size of the welding device in the radial direction of the stirring member. In this way, the welding device can be used to weld workpieces with narrow spaces, reducing the possibility of interference between the welding device and the workpiece, and further leveraging the welding advantages of the welding device with a static shoulder.

[0028] In any of the above technical solutions, further, one of the outer cover and the static shoulder is provided with a clamping block, and the other is provided with a clamping groove, and the clamping block is cooperatively connected with the clamping groove.

[0029] In this technical solution, the mating structure between the outer cover and the static shoulder is rationally configured, with one of the outer cover and the static shoulder having a retaining block and the other having a retaining slot. The retaining block and the retaining slot are then mated to achieve the mating assembly of the outer cover and the static shoulder. This mating arrangement of the retaining block and the retaining slot increases the mating area and angle between the outer cover and the static shoulder, enabling position limiting in multiple directions and angles, thereby ensuring the stability and reliability of the assembly between the outer cover and the static shoulder.

[0030] In any of the above technical solutions, further, the welding device also includes a first fastener, and the first fastener is used to assemble the static shoulder and the outer cover together.

[0031] In this technical solution, a first fastener is provided to assemble the static shoulder and the outer cover together. This arrangement allows for a removable connection between the static shoulder and the outer cover. This allows for the static shoulder and the outer cover to be removable and assembled, and their respective positions to be fine-tuned based on actual conditions. This allows for adaptability to various welding equipment requirements, improving product performance.

[0032] In any of the above technical solutions, further, when the welding device includes a first fastener, the first fastener is a bolt or a nut.

[0033] In this technical solution, the first fastener is a bolt, which is used to pass through the static shaft shoulder and lock into the outer cover, thereby assembling the static shaft shoulder and the outer cover together. This arrangement realizes a detachable and mating connection between the static shaft shoulder and the outer cover.

[0034] In this technical solution, the first fastener is a nut. The conical section of the static shoulder passes through the nut and protrudes from the nut. The nut is threadedly connected to the outer cover. In other words, the static shoulder and the outer cover are assembled together by the nut. This arrangement achieves a detachable connection between the static shoulder and the outer cover.

[0035] In any of the above technical solutions, further, the stirring member includes: a knife handle, which is provided with an installation channel along the axial direction of the knife handle; a stirring needle, which is provided in the installation channel, and the stirring head of the stirring needle extends out of the knife handle and passes through the through hole to protrude from the static shaft shoulder.

[0036] In this technical solution, the stirring element includes a handle and a stirring needle. There is a gap between the handle and the static shoulder, so the stirring element can rotate relative to the static shoulder and the outer cover, which provides structural support for the rotation of the stirring element.

[0037] Furthermore, because the stirring tip of the stirring needle extends from the tool handle, passes through the through hole, and protrudes above the static shoulder, effective friction between the stirring needle and the workpiece material to be welded is ensured. Furthermore, the tool handle has a mounting channel, into which the stirring needle is mounted, so the extension length of the stirring tip relative to the tool handle can be adjusted to meet diverse welding requirements.

[0038] In any of the above technical solutions, further, a positioning surface is formed on part of the side wall of the stirring needle, and the tool handle is provided with a positioning hole, which is arranged corresponding to the positioning surface; a second fastener extends into the positioning hole and abuts against the positioning surface, and the second fastener can limit the protruding length of the stirring head relative to the tool handle.

[0039] In this technical solution, the matching structure of the stirring needle and the tool handle is configured so that a positioning surface is formed on part of the side wall of the stirring needle. A positioning hole is provided in the portion of the tool handle corresponding to the positioning surface. A second fastener can be screwed into the positioning hole and abutted against the positioning surface to achieve the function of locking the stirring needle and the tool handle. When the extension length of the stirring needle's stirring tip relative to the tool handle needs to be adjusted, the stirring needle can be moved, and then the stirring tip and tool handle that meet the matching requirements are locked together using the second fastener.

[0040] Specifically, a portion of the side wall of the stirring pin is recessed to form a positioning surface.

[0041] In any of the above technical solutions, the welding device further includes: a driving member, which is provided with a driving shaft, the driving shaft is connected to the stirring member, and the driving member can drive the stirring member to rotate through the driving shaft; wherein the static shoulder is connected to the driving member.

[0042] In this technical solution, the welding device also includes a driving member, which is provided with a driving shaft, and the driving shaft is connected to the stirring member. The driving member drives the stirring member to rotate, so that the stirring member and the workpiece to be welded are rubbed by the high-speed rotation of the stirring member, thereby increasing the temperature of the workpiece to be welded and softening it, so as to complete the welding by friction stirring the workpiece.

[0043] Furthermore, the static shoulder of the welding device is connected to the driving member (for example, the static shoulder is connected to the driving member through the outer cover). More specifically, the outer cover of the welding device is connected to the non-rotating part of the driving member to ensure that the driving member effectively supports and fixes the outer cover and static shoulder of the welding device.

[0044] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0046] Figure 1 A schematic structural diagram of a welding device according to a first embodiment of the present invention is shown;

[0047] Figure 2 A cross-sectional view showing a welding device according to a first embodiment of the present invention;

[0048] Figure 3 Shown Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0049] Figure 4 A schematic structural diagram of a static shoulder of a first embodiment of the present invention from a first perspective is shown;

[0050] Figure 5 A schematic structural diagram of a second perspective of the static shoulder of the first embodiment of the present invention is shown;

[0051] Figure 6 A schematic structural diagram showing a static shoulder of the first embodiment of the present invention from a third perspective;

[0052] Figure 7 A schematic structural diagram of a stirring needle according to a first embodiment of the present invention is shown;

[0053] Figure 8 A schematic structural diagram of the outer cover of the first embodiment of the present invention is shown;

[0054] Figure 9 A schematic structural diagram of a knife handle according to a first embodiment of the present invention is shown;

[0055] Figure 10 A cross-sectional view of a knife handle according to a first embodiment of the present invention is shown;

[0056] Figure 11 A schematic structural diagram of a welding device according to a second embodiment of the present invention is shown;

[0057] Figure 12 A cross-sectional view showing a welding device according to a second embodiment of the present invention;

[0058] Figure 13 Shown Figure 12 Schematic diagram of the enlarged structure at B in the middle;

[0059] Figure 14 A schematic structural diagram of a static shoulder according to a second embodiment of the present invention from a first perspective is shown;

[0060] Figure 15 A schematic structural diagram of a second perspective of a static shoulder of a second embodiment of the present invention is shown;

[0061] Figure 16 A schematic structural diagram showing a static shoulder of a second embodiment of the present invention from a third perspective;

[0062] Figure 17 A schematic structural diagram of a stirring needle according to a second embodiment of the present invention is shown;

[0063] Figure 18 A schematic structural diagram of an outer cover according to a second embodiment of the present invention is shown;

[0064] Figure 19 A schematic structural diagram of a nut according to a second embodiment of the present invention is shown;

[0065] Figure 20A schematic structural diagram of a knife handle according to a second embodiment of the present invention from a first perspective is shown;

[0066] Figure 21 A schematic structural diagram of a knife handle according to a second embodiment of the present invention from a second perspective is shown;

[0067] Figure 22 A schematic structural diagram showing a fourth perspective of the static shoulder of the second embodiment of the present invention;

[0068] Figure 23 A schematic structural diagram showing a static shoulder of the second embodiment of the present invention from a fifth perspective;

[0069] Figure 24 Shown Figure 23 Schematic diagram of the structure along CC direction;

[0070] Figure 25 A schematic structural diagram of a static shoulder according to a third embodiment of the present invention is shown;

[0071] Figure 26 FIG2 shows a schematic structural diagram of a static shoulder according to a fourth embodiment of the present invention;

[0072] Figure 27 FIG. 1 shows a schematic structural diagram of a static shoulder according to a fifth embodiment of the present invention.

[0073] in, Figures 1 to 27 The corresponding relationship between the reference numerals and component names is as follows:

[0074] 100 welding device, 110 static shoulder, 112 discharge channel, 1122 first subchannel, 1124 second subchannel, 1126 third subchannel, 1128 fourth subchannel, 114 cylindrical section, 116 conical section, 120 stirring member, 122 tool handle, 124 stirring needle, 126 stirring head, 128 mounting channel, 130 positioning surface, 132 positioning hole, 140 through hole, 150 first opening, 160 second opening, 170 outer cover, 180 block, 190 slot, 200 nut, 210 bolt, 220 connecting hole. DETAILED DESCRIPTION

[0075] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0076] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0077] Refer to the following Figures 1 to 27 A welding apparatus 100 according to some embodiments of the present invention is described.

[0078] Example 1:

[0079] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 11 、 Figure 12 and Figure 13 As shown, an embodiment of the first aspect of the present invention proposes a welding device 100 including a static shoulder 110 and a stirring member 120. The static shoulder 110 includes a discharge channel 112 arranged along the circumferential direction and a through hole 140 arranged along the axial direction. One end of the discharge channel 112 is connected to the through hole 140, and the other end extends to the outer surface of the static shoulder 110. The stirring member 120 is inserted into the through hole 140, and the stirring member 120 can rotate relative to the static shoulder 110.

[0080] In detail, the welding device 100 includes a static shoulder 110 and a stirring member 120. The static shoulder 110 includes a discharge channel 112 and a through hole 140. The discharge channel 112 is arranged in a circumferential direction, and the through hole 140 is arranged in an axial direction. One end of the discharge channel 112 is connected to the through hole 140, and the other end extends to the outer surface of the static shoulder 110. The stirring member 120 is connected to the drive shaft of the driving member, and the driving member drives the stirring member 120 to rotate through the drive shaft. The static shoulder 110 is connected to the non-rotating part of the driving member. When the welding device 100 is in operation, the high-speed rotation of the stirring member 120 causes the stirring member 120 to rub against the workpiece to be welded, thereby increasing the temperature of the workpiece to be welded and softening it, so as to frictionally stir the workpiece to complete the welding. Since the static shoulder 110 is connected to the non-rotating part of the driving member, it does not rotate. During the welding process, as the stirring piece 120 rotates, the welding material sandwiched between the through hole 140 of the static shoulder 110 and the stirring piece 120 will be discharged from the welding device 100 along the discharge channel 112 under the action of centrifugal force, so that the welding material will not accumulate in the gap between the through hole 140 of the static shoulder 110 and the stirring piece 120, thereby reducing the resistance of the stirring piece 120 during operation and ensuring the welding efficiency of the welding device 100.

[0081] At the same time, since the discharge channels 112 are arranged along the circumferential direction, the distribution structure of the discharge channels 112 is reasonably defined. In other words, the rotation direction of the stirring member 120 matches the extension direction of the discharge channels 112, thereby reducing the resistance of the welding material between the through hole 140 of the static shoulder 110 and the stirring member 120 to discharge from the welding device 100 along the discharge channels 112, which is conducive to improving the discharge efficiency of the welding material.

[0082] Specifically, the discharge channel 112 is arranged along the circumference of the stirring member 120 , and the through hole 140 is arranged along the axial direction of the stirring member 120 .

[0083] Example 2:

[0084] like Figure 5 、 Figure 6 、 Figure 15 、 Figure 16 、 Figure 22 、 Figure 23 、 Figure 24 、 Figure 25 、 Figure 26 and Figure 27 As shown, on the basis of Example 1, Example 2 provides a welding device 100 including a static shoulder 110 and a stirring member 120, the static shoulder 110 including a discharge channel 112 arranged along the circumferential direction and a through hole 140 arranged along the axial direction, one end of the discharge channel 112 is connected to the through hole 140, and the other end extends to the outer surface of the static shoulder 110, the stirring member 120 is inserted into the through hole 140, and the stirring member 120 can rotate relative to the static shoulder 110.

[0085] Furthermore, the discharge channel 112 is arranged in a spiral shape.

[0086] Specifically, by rationally arranging the structure of the discharge channel 112, the discharge channel 112 is arranged in a spiral shape, which facilitates the welding material to be smoothly discharged from the welding device 100 under the action of centrifugal force. The spiral shape has the advantages of easy processing and low production cost.

[0087] Furthermore, the spiral direction of the discharge channel 112 is the same as the rotation direction of the stirring member 120. By rationally arranging the structure of the discharge channel 112, the spiral direction of the discharge channel 112 is the same as the rotation direction of the stirring member 120. In this way, when the stirring member 120 rotates relative to the static shoulder 110, the resistance of the welding material between the static shoulder 110 and the stirring member 120 to discharge from the welding device 100 along the discharge channel 112 is reduced, thereby facilitating the discharge of the welding material and improving the efficiency of the welding material discharge.

[0088] Specifically, if Figure 24 、 Figure 25 and Figure 27As shown, there are two discharge channels 112 , and the spiral directions of the two discharge channels 112 are the same as the rotation direction of the stirring member 120 , wherein the arrow indicates the rotation direction of the stirring member 120 .

[0089] Specifically, if Figure 26 As shown, the spiral direction of the discharge channel 112 is the same as the rotation direction of the stirring member 120 , wherein the arrow indicates the rotation direction of the stirring member 120 .

[0090] Example 3:

[0091] like Figure 4 、 Figure 5 、 Figure 6 、 Figure 14 、 Figure 15 、 Figure 22 、 Figure 23 、 Figure 24 、 Figure 25 and Figure 26 As shown, based on Example 1 or Example 2, Example 3 provides a welding device 100 including a static shoulder 110 and a stirring member 120, the static shoulder 110 including a discharge channel 112 arranged along the circumferential direction and a through hole 140 arranged along the axial direction, one end of the discharge channel 112 is connected to the through hole 140, and the other end extends to the outer surface of the static shoulder 110, the stirring member 120 is inserted into the through hole 140, and the stirring member 120 can rotate relative to the static shoulder 110.

[0092] Furthermore, the first opening 150 at one end of the discharge channel 112 communicating with the through hole 140 is smaller than the second opening 160 of the discharge channel 112 extending to the surface of the static shoulder 110 .

[0093] Specifically, by rationally configuring the structure of discharge channel 112, first opening 150 at one end of discharge channel 112 communicating with through-hole 140 is smaller than second opening 160 extending from discharge channel 112 to the surface of static shoulder 110. In other words, the welding material between through-hole 140 of static shoulder 110 and stirring member 120 is discharged through first opening 150 to second opening 160, and then out of welding device 100. Second opening 160 is larger than first opening 150, which increases the angle and area of ​​welding material discharge, thereby improving welding material discharge efficiency.

[0094] Further, if Figure 6 、 Figure 22 、 Figure 23 、 Figure 24 and Figure 25As shown, the cross-sectional area of ​​discharge channel 112 gradually increases from first opening 150 to second opening 160. That is, discharge channel 112 is arranged in a fan shape. This arrangement, through the rational arrangement of discharge channel 112, allows the discharge angle of discharge channel 112 to gradually increase from first opening 150 to second opening 160, and the discharge area of ​​discharge channel 112 to gradually increase. This reduces the resistance of the welding material to exiting the welding device 100 along discharge channel 112, facilitates the discharge of the welding material, and improves the efficiency of welding material discharge.

[0095] Specifically, if Figure 26 As shown, discharge channel 112 includes a first sub-channel 1122 and a second sub-channel 1124. A first opening 150 is provided in first sub-channel 1122, which has a columnar structure. Second sub-channel 1124 is connected to first sub-channel 1122. A second opening 160 is provided in second sub-channel 1124. The flow cross-sectional area of ​​second sub-channel 1124 gradually increases from first opening 150 to second opening 160. That is, first sub-channel 1122 is columnar, while second sub-channel 1124 is fan-shaped. The welding material between through-hole 140 of static shoulder 110 and stirring element 120 passes through first sub-channel 1122 and second sub-channel 1124 in sequence before exiting welding device 100. This arrangement, through the rational arrangement of the discharge channel 112 structure, allows the discharge angle of the second sub-channel 1124 to gradually increase from the first opening 150 to the second opening 160, and the discharge area of ​​the second sub-channel 1124 to gradually increase. This reduces the resistance of the welding material to discharge from the welding device 100 along the discharge channel 112, facilitates the discharge of the welding material, and improves the efficiency of the discharge of the welding material. Specifically, the first opening 150 at the end of the first sub-channel 1122 that communicates with the through hole 140 is smaller than the second opening 160 of the second sub-channel 1124 that extends to the surface of the static shoulder 110.

[0096] Specifically, if Figure 24 As shown, the discharge channel 112 includes a third sub-channel 1126 and a fourth sub-channel 1128, the third sub-channel 1126 and the fourth sub-channel 1128 are connected, and the third sub-channel 1126 and the fourth sub-channel 1128 are arranged along the circumference of the static shaft shoulder 110, a part of the first opening 150 is provided in the third sub-channel 1126, and another part of the first opening 150 is provided in the fourth sub-channel 1128, the third sub-channel 1126 is a columnar structure, a part of the second opening 160 is provided in the third sub-channel 1126, and another part of the second opening 160 is provided in the fourth sub-channel 1128, and the fourth sub-channel 1128 is arranged in a fan shape.

[0097] Specifically, the discharge channel 112 is sectioned along the axis perpendicular to the static shoulder 110. In the section, the contour line of the discharge channel 112 includes any one of the following or a combination thereof: a straight line, a curve, and a broken line. Figure 5 、 Figure 6 、 Figure 15 、 Figure 16 、 Figure 22 、 Figure 23 and Figure 27 As shown, the outline of the discharge channel 112 includes a curve; Figure 25 As shown, the outline of the discharge channel 112 includes a straight line; Figure 26 As shown, the outline of the discharge channel 112 includes straight lines and broken lines; Figure 27 As shown, the outline of the discharge channel 112 includes a curved line.

[0098] Example 4:

[0099] like Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 、 Figure 13 、 Figure 15 、 Figure 16 、 Figure 22 and Figure 23 As shown, based on any of the above embodiments, Example 4 provides a welding device 100 including a static shoulder 110 and a stirring member 120, the static shoulder 110 including a discharge channel 112 arranged along the circumferential direction and a through hole 140 arranged along the axial direction, one end of the discharge channel 112 is connected to the through hole 140, and the other end extends to the outer surface of the static shoulder 110, the stirring member 120 is inserted into the through hole 140, and the stirring member 120 can rotate relative to the static shoulder 110.

[0100] Furthermore, the static shoulder 110 includes a conical section 116 , the stirring head 126 of the stirring element 120 passes through the conical section 116 and protrudes from the static shoulder 110 , and the discharge channel 112 is at least partially located in the conical section 116 .

[0101] In detail, the static shoulder 110 includes a conical section 116, and the stirring head 126 of the stirring member 120 passes through the conical section 116 and protrudes from the static shoulder 110. During welding, the conical section 116 acts on the workpiece to be welded, and has the function of pressing the workpiece to be welded and the welding material to ensure the effective combination of the workpiece to be welded and the welding material, thereby ensuring the welding quality.

[0102] In addition, the static shoulder 110 includes a conical section 116, which helps reduce the volume of the static shoulder 110 while ensuring the structural strength of the static shoulder 110, thereby reducing the overall weight of the static shoulder 110. Thus, when welding materials, at the same welding depth, the static shoulder 110 stirs the parent metal in a small range, outputting concentrated heat, allowing the stirring member 120 to rotate at a higher speed, resulting in small flash during welding and a narrow, aesthetically pleasing weld seam. Therefore, this configuration enables the welding device 100 to be used for welding thin sheets of relatively thin thickness. Furthermore, due to the small thermal range of the static shoulder 110 and the narrow weld seam formed, the probability of collapsing thin-walled sheets can be reduced, while eliminating the need to remove flash and burrs from the material after welding.

[0103] Furthermore, if Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 、 Figure 13 、 Figure 15 、 Figure 16 、 Figure 22 and Figure 23 As shown, the static shoulder 110 further includes a cylindrical section 114 and a conical section 116. The cylindrical section 114 is disposed on the circumference of the stirring element 120, and the conical section 116 is connected to the cylindrical section 114. The stirring head 126 of the stirring element 120 extends out of the conical section 116, and the discharge channel 112 is disposed in the conical section 116. When the static shoulder 110 is sectioned perpendicular to the axis of the stirring element 120, the cross-sectional area of ​​the conical section 116 is smaller than that of the cylindrical section 114. In other words, the structure of the static shoulder 110 is rationally designed, thereby reducing the volume of the conical section 116 while maintaining the structural strength of the static shoulder 110, thereby reducing the overall weight of the static shoulder 110.

[0104] Example 5:

[0105] like Figure 1 、 Figure 3 and Figure 8 As shown, based on any of the above embodiments, Example 5 provides a welding device 100 including a static shoulder 110 and a stirring member 120, the static shoulder 110 including a discharge channel 112 arranged along the circumferential direction and a through hole 140 arranged along the axial direction, one end of the discharge channel 112 is connected to the through hole 140, and the other end extends to the outer surface of the static shoulder 110, the stirring member 120 is inserted into the through hole 140, and the stirring member 120 can rotate relative to the static shoulder 110.

[0106] Furthermore, the welding device 100 further includes an outer cover 170 , which is connected to the static shoulder 110 and is disposed on a peripheral side of the stirring member 120 .

[0107] Specifically, the welding device 100 further includes an outer cover 170. The outer cover 170 is connected to the static shoulder 110 by providing a mating structure between the outer cover 170 and the static shoulder 110, and the outer cover 170 is disposed on the circumference of the stirring member 120. The outer cover 170 is connected to the non-rotating portion of the driving member of the welding device 100. In other words, the static shoulder 110 is connected to the driving member of the welding device 100 via the outer cover 170. Furthermore, the outer cover 170 protects the stirring member 120 located therein, preventing dirt, impurities, etc. from entering the stirring member 120 and causing the stirring member 120 to malfunction.

[0108] At the same time, the outer cover 170 is connected to the static shoulder 110, which helps to shorten the size of the welding device 100 in the radial direction of the stirring member 120. In this way, the welding device 100 can be used to weld workpieces with narrow spaces, reducing the possibility of interference between the welding device 100 and the workpiece, and further leveraging the welding advantages of the welding device 100 with the static shoulder 110.

[0109] Furthermore, the cylindrical section 114 is located between the outer cover 170 and the conical section 116. This arrangement ensures the effectiveness and feasibility of the mating connection between the static shoulder 110 and the outer cover 170 while also helping to shorten the radial dimension of the welding device 100 in the stirring member 120. In this way, the welding device 100 can be used to weld workpieces with narrow spaces, reducing the possibility of interference between the welding device 100 and the workpiece, and further leveraging the welding advantages of the welding device 100 having the static shoulder 110.

[0110] In this embodiment, if Figure 1 、 Figure 2 and Figure 8 As shown, the stirring member 120 and the outer cover 170 are both columnar structures, which is conducive to shortening the size of the welding device 100 in the radial direction of the stirring member 120.

[0111] In some other embodiments, such as Figure 12 and Figure 20 As shown, the stirring member 120 is a conical structure, and the outer cover 170 can be a cylindrical structure, a conical structure, etc., which are not listed here one by one. This arrangement is conducive to improving the stability and reliability of the rotation of the stirring member 120.

[0112] Example 6:

[0113] like Figure 5 、 Figure 6 and Figure 8As shown, on the basis of Example 5, Example 6 provides a welding device 100 including a static shoulder 110 and a stirring member 120, the static shoulder 110 including a discharge channel 112 arranged along the circumferential direction and a through hole 140 arranged along the axial direction, one end of the discharge channel 112 is connected to the through hole 140, and the other end extends to the outer surface of the static shoulder 110, the stirring member 120 is penetrated by the through hole 140, and the stirring member 120 can rotate relative to the static shoulder 110, the welding device 100 also includes an outer cover 170, the outer cover 170 is connected to the static shoulder 110, and the outer cover 170 is arranged on the circumferential side of the stirring member 120.

[0114] Furthermore, one of the outer cover 170 and the static shoulder 110 is provided with a clamping block 180 , and the other is provided with a clamping groove 190 , and the clamping block 180 is cooperatively connected with the clamping groove 190 .

[0115] Specifically, by rationally configuring the mating structure of the outer cover 170 and the static shoulder 110, one of the outer cover 170 and the static shoulder 110 is provided with a clamping block 180, and the other is provided with a clamping slot 190. The clamping block 180 and the clamping slot 190 are mated and connected to achieve mating assembly of the outer cover 170 and the static shoulder 110. The mating arrangement of the clamping block 180 and the clamping slot 190 facilitates increasing the mating area and mating angle between the outer cover 170 and the static shoulder 110, enabling position limiting in multiple directions and angles, thereby ensuring the stability and reliability of the assembly of the outer cover 170 and the static shoulder 110.

[0116] In this embodiment, a clamping block 180 is provided on the cylindrical section 114 of the static shoulder 110 , and a clamping groove 190 is provided on the outer cover 170 . The clamping block 180 is cooperatively connected with the clamping groove 190 .

[0117] In some other embodiments, a slot 190 is provided on the cylindrical section 114 of the static shoulder 110 , and a block 180 is provided on the outer cover 170 . The block 180 is engaged with the slot 190 .

[0118] Further, if Figure 3 As shown, welding device 100 also includes a first fastener, which is used to assemble static shoulder 110 and outer cover 170. This arrangement allows for a removable connection between static shoulder 110 and outer cover 170. Specifically, the static shoulder 110 and outer cover 170 can be removably assembled and disassembled, and their respective positions can be fine-tuned based on actual circumstances. This allows for adaptability to different welding device 100 usage requirements, improving product performance and enhancing product adaptability.

[0119] Specifically, if Figure 3As shown, the first fastener is a bolt 210. The bolt 210 is used to pass through the static shoulder 110 and lock into the outer cover 170, thereby assembling the static shoulder 110 and the outer cover 170 together. This arrangement realizes a detachable and mating connection between the static shoulder 110 and the outer cover 170.

[0120] Specifically, if Figure 11 、 Figure 12 、 Figure 13 、 Figure 19 As shown, the first fastener is a nut 200. The conical section 116 of the static shoulder 110 passes through the nut 200 and protrudes from the nut 200. The nut 200 is threadedly engaged with the outer cover 170. That is, the static shoulder 110 and the outer cover 170 are assembled together via the nut 200. This arrangement realizes a detachable mating connection between the static shoulder 110 and the outer cover 170.

[0121] Specifically, one of the outer cover 170 and the static shoulder 110 is provided with a block 180, and the other is provided with a slot 190. The block 180 is engaged with the slot 190. The welding device 100 also includes a first fastener, which is used to assemble the static shoulder 110 and the outer cover 170. The block 180, the slot 190, and the first fastener cooperate to assemble the static shoulder 110 and the outer cover 170.

[0122] In addition, the conical section 116 of the static shoulder 110 extends out of the nut 200, that is, the nut 200 and the outer cover 170 cooperate to clamp the cylindrical section 114 of the static shoulder 110 without interfering with the conical section 116 of the static shoulder 110. Therefore, the feasibility of assembling the static shoulder 110 and the driving part of the welding device 100 can be ensured while not affecting the normal operation of the static shoulder 110.

[0123] Furthermore, the nut 200 and the outer cover 170 are detachably connected, so that the nut 200 and the outer cover 170 can be disassembled and assembled according to actual conditions, and the installation positions of the nut 200 and the outer cover 170 can be fine-tuned, thereby being able to adapt to the use requirements of different welding devices 100. The product has strong adaptability and improves the performance of the product.

[0124] Specifically, the nut 200 is threadedly connected to the outer wall of the outer cover 170. By properly setting the matching structure of the nut 200 and the outer cover 170, the nut 200 is threadedly connected to the outer wall of the outer cover 170. This facilitates assembly and disassembly and avoids the need for fasteners for assembling the nut 200 and the outer cover 170, which helps reduce the production cost of the welding device 100.

[0125] Of course, the connection method between the nut 200 and the outer cover 170 is not limited to threaded connection, and can also be magnetic connection, clamping connection, and fastening by fasteners (bolts 210, screws or rivets).

[0126] Example 7:

[0127] like Figure 2 、 Figure 3 、 Figure 7 、 Figure 9 、 Figure 12 、 Figure 13 、 Figure 17 、 Figure 20 and Figure 21 As shown, based on any of the above embodiments, Example 7 provides a welding device 100 including a static shoulder 110 and a stirring member 120, the static shoulder 110 including a discharge channel 112 arranged along the circumferential direction and a through hole 140 arranged along the axial direction, one end of the discharge channel 112 is connected to the through hole 140, and the other end extends to the outer surface of the static shoulder 110, the stirring member 120 is inserted into the through hole 140, and the stirring member 120 can rotate relative to the static shoulder 110.

[0128] Furthermore, the stirring member 120 includes a handle 122 and a stirring needle 124 , and an installation channel 128 is provided along the axial direction of the handle 122 . The stirring needle 124 is provided in the installation channel 128 , and the stirring head 126 of the stirring needle 124 extends out of the handle 122 and passes through the through hole 140 to protrude from the static shaft shoulder 110 .

[0129] In detail, the stirring member 120 includes a handle 122 and a stirring needle 124. There is a gap between the handle 122 and the static shoulder 110, so that the stirring member 120 can rotate relative to the static shoulder 110, and the stirring member 120 can also rotate relative to the outer cover 170, which provides structural support for the rotation of the stirring member 120.

[0130] Furthermore, because the stirring tip 126 of the stirring pin 124 extends from the tool handle 122 and passes through the through hole 140 to protrude from the static shoulder 110, effective friction between the stirring pin 124 and the workpiece material to be welded is ensured. Furthermore, the tool handle 122 is provided with a mounting channel 128, and the stirring pin 124 is mounted within the mounting channel 128. This allows for adjustable extension of the stirring tip 126 of the stirring pin 124 relative to the tool handle 122 to meet diverse welding requirements.

[0131] Furthermore, if Figure 3 、 Figure 7 、 Figure 12 、 Figure 13 and Figure 17As shown, a positioning surface 130 is formed on a portion of the sidewall of the stirring needle 124, and a positioning hole 132 is provided in the handle 122. The positioning hole 132 is arranged corresponding to the positioning surface 130. A second fastener extends into the positioning hole 132 and abuts against the positioning surface 130. The second fastener can limit the extension length of the stirring head 126 relative to the handle 122. By providing a matching structure between the stirring needle 124 and the handle 122, the positioning surface 130 is formed on a portion of the sidewall of the stirring needle 124, and the positioning hole 132 is provided in the portion of the handle 122 corresponding to the positioning surface 130. The second fastener can be screwed into the positioning hole 132 and abut against the positioning surface 130 to achieve the function of locking the stirring needle 124 and the handle 122. When the extension length of the stirring head 126 of the stirring needle 124 relative to the handle 122 needs to be adjusted, the stirring needle 124 can be moved, and then the stirring head 126 and the handle 122 are locked together by the second fastener until the matching requirement is met.

[0132] Specifically, a portion of the sidewall of the stirring pin 124 is recessed to form a positioning surface 130 .

[0133] Specifically, the second fastener includes a screw, a bolt or a rivet.

[0134] Example 8:

[0135] Based on any of the above embodiments, Example 8 provides a welding device 100 including a static shoulder 110 and a stirring member 120, the static shoulder 110 including a discharge channel 112 arranged along the circumferential direction and a through hole 140 arranged along the axial direction, one end of the discharge channel 112 is connected to the through hole 140, and the other end extends to the outer surface of the static shoulder 110, the stirring member 120 is inserted into the through hole 140, and the stirring member 120 can rotate relative to the static shoulder 110.

[0136] Furthermore, the welding device 100 also includes a driving member, which is provided with a driving shaft connected to the stirring member 120. The driving member can drive the stirring member 120 to rotate via the driving shaft, and the static shoulder 110 is connected to the driving member.

[0137] In detail, the welding device 100 also includes a driving member, which is provided with a driving shaft, and the driving shaft is connected to the stirring member 120. The driving member drives the stirring member 120 to rotate, so that the stirring member 120 rotates at a high speed, and the stirring member 120 rubs against the workpiece to be welded, thereby increasing the temperature of the workpiece to be welded and softening it, so as to complete the welding by friction stirring the workpiece.

[0138] Furthermore, the static shoulder 110 of the welding device 100 is connected to the driving member (for example, the static shoulder 110 is connected to the driving member through the outer cover 170). More specifically, the outer cover 170 of the welding device 100 is connected to the non-rotating part of the driving member to ensure that the driving member effectively supports and fixes the outer cover 170 and the static shoulder 110 of the welding device 100. Specific embodiment:

[0140] like Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 and Figure 24 As shown, the installation sequence of the welding device 100 according to one embodiment is as follows:

[0141] The stirring needle 124 is first inserted into the mounting channel 128 of the tool handle 122 to preliminarily fix the stirring needle 124; the second fastener (such as a tightening bolt 210) is inserted from the positioning hole 132 of the tool handle 122 and supports the positioning surface 130 of the stirring needle 124; the tool handle 122 and the stirring needle 124 are inserted into the conical outer cover 170, and the part of the stirring needle 124 extending out of the outer cover 170 is inserted into the conical static shoulder 110, and the first pin hole of the static shoulder 110 and the second pin hole of the outer cover 170 are aligned, and cylindrical pins are installed in the first pin hole and the second pin hole, and then the nut 200 (such as a locking nut) is put on the conical static shoulder 110, and the internal thread of the locking nut is tightened with the external thread at the end of the outer cover 170; the tool handle 122 is installed on the drive shaft of the welding device 100; the static shoulder 110 and the locking nut are connected to the outer cover 170, and the outer cover 170 is fixed to the non-rotating part of the driving member through a transition flange. During this process, the position of the jacking bolt 210 in the tool handle 122 is adjusted so that the protruding length of the stirring pin 124 matches the end of the conical section 116 of the static shoulder 110, and then the stirring pin 124 is tightened. The outer cover 170 is provided with a connecting hole 220, which corresponds to the positioning hole 132 of the tool handle 122. The jacking bolt 210 can be locked into the positioning hole 132 through the connecting hole 220 and then abut against the positioning surface 130.

[0142] like Figures 1 to 10 As shown, the installation sequence of the welding device 100 according to another embodiment is as follows:

[0143] Insert the stirring needle 124 into the installation channel 128 of the tool handle 122 to preliminarily fix the stirring needle 124; insert the second fastener (e.g., the tightening bolt 210) from the positioning hole 132 of the tool handle 122 and press against the positioning surface 130 of the stirring needle 124; insert the tool handle 122 together with the stirring needle 124 into the cylindrical outer cover 170, and insert the part of the stirring needle 124 extending out of the outer cover 170 into the static shoulder 110; align the first threaded hole of the static shoulder 110 with the second threaded hole of the outer cover 170. The threaded holes are aligned with the first pin hole of the static shoulder 110 and the second pin hole of the outer cover 170, and the block 180 of the static shoulder 110 is aligned with the slot 190 of the outer cover 170. The connecting bolt 210 is screwed into the first and second threaded holes in sequence, and cylindrical pins are installed in the first and second pin holes. The tool holder 122 is mounted on the drive shaft of the welding device 100. The static shoulder 110 is connected to the outer cover 170, and the outer cover 170 is fixed to the non-rotating portion of the drive member via a transition flange. During the above process, the position of the tightening bolt 210 in the tool holder 122 is adjusted so that the extended length of the stirring pin 124 matches the end of the conical section 116 of the static shoulder 110, and then the stirring pin 124 is tightened. The outer cover 170 is provided with a connecting hole 220 , which is corresponding to the positioning hole 132 of the shank 122 . The tightening bolt 210 can be locked into the positioning hole 132 through the connecting hole 220 and then abut against the positioning surface 130 .

[0144] In the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; and "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0145] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0146] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A welding device, characterized in that: include: A static shoulder, the static shoulder comprising a discharge channel arranged along the circumferential direction and a through hole arranged along the axial direction, one end of the discharge channel being connected to the through hole and the other end extending to the outer surface of the static shoulder; a stirring member, the stirring member being passed through the through hole and capable of rotating relative to the static shoulder; The discharge channel is arranged in a spiral shape; The spiral direction of the discharge channel is the same as the rotation direction of the stirring member, reducing the resistance of the welding material between the static shoulder and the stirring member to be discharged along the discharge channel; The first opening of one end of the discharge channel connected to the through hole is smaller than the second opening of the discharge channel extending to the surface of the static shoulder. From the first opening to the second opening, the flow cross-sectional area of ​​the discharge channel gradually increases, and the welding material between the through hole and the stirring member is discharged to the second opening through the first opening.

2. The welding device according to claim 1, characterized in that The discharge channel comprises: a first sub-channel, wherein the first opening is provided in the first sub-channel, and the first sub-channel is a columnar structure; a second sub-channel, the second sub-channel being connected to the first sub-channel, the second opening being provided in the second sub-channel; Wherein, the flow cross-sectional area of ​​the second sub-channel gradually increases from the first opening to the second opening.

3. The welding device according to claim 1, characterized in that The discharge channel is sectioned along an axial direction perpendicular to the static shoulder. In the section, the contour line of the discharge channel includes any one of the following or a combination thereof: a straight line, a curve, and a broken line.

4. The welding device according to any one of claims 1 to 3, characterized in that The static shoulder comprises: a conical section, wherein the stirring head of the stirring member passes through the conical section and protrudes from the static shaft shoulder; Wherein, the discharge channel is at least partially located in the conical section.

5. The welding device according to any one of claims 1 to 3, characterized in that Also includes: An outer cover connected to the static shoulder; Wherein, the outer cover is arranged on the peripheral side of the stirring member.

6. The welding device according to claim 5, characterized in that One of the outer cover and the static shoulder is provided with a clamping block, and the other is provided with a clamping slot, the clamping block is cooperatively connected with the clamping slot; and / or A first fastener is used to assemble the static shoulder and the outer cover together.

7. The welding device according to claim 6, characterized in that When the welding device includes the first fastener, the first fastener is a bolt or a nut.

8. The welding device according to any one of claims 1 to 3, characterized in that The stirring member comprises: A knife handle is provided with a mounting channel along the axial direction of the knife handle; A stirring needle is arranged in the installation channel, and a stirring head of the stirring needle extends out of the tool handle and passes through the through hole to protrude from the static shaft shoulder.

9. The welding device according to claim 8, characterized in that Part of the side wall of the stirring needle is formed with a positioning surface, and the handle is provided with a positioning hole, and the positioning hole is arranged corresponding to the positioning surface; A second fastener extends into the positioning hole and abuts against the positioning surface, and the second fastener can limit the protruding length of the stirring head relative to the tool handle.

10. The welding device according to any one of claims 1 to 3, characterized in that Also includes: A driving member, provided with a driving shaft, wherein the driving shaft is connected to the stirring member, and the driving member can drive the stirring member to rotate via the driving shaft; Wherein, the static shoulder is connected to the driving member.

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