A compound friction stir welding device with bottom ultrasonic vibration and auxiliary heating

Abstract

The application discloses a kind of bottom ultrasonic vibration and auxiliary heating's composite friction stir welding device, it is related to welding technical field, the present application includes support table, stably frame is movably arranged on support table, welding assembly is arranged on stable component, clamping component is arranged on support table, stably frame is transverse sliding on support table;Welding assembly includes support sleeve, ultrasonic vibration module, resistance heating block, ceramic heat insulation ring and stir head, circular mounting groove is opened in stable base plate, support sleeve is installed in circular mounting groove by screw, ultrasonic vibration module is installed in support sleeve by screw, circular ultrasonic impact hole and rectangular mounting groove are opened in the upper portion of stable vertical plate, ceramic heat insulation ring is installed in rectangular mounting groove, resistance heating block is arranged in the middle of ceramic heat insulation ring, and stir head is located directly above ceramic heat insulation ring.The present application is a kind of bottom ultrasonic vibration and auxiliary heating's composite friction stir welding device, and welding effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding, in particular to a bottom ultrasonic vibration and auxiliary heating composite friction stir welding device. BACKGROUND

[0002] Friction stir welding is a new solid-phase joining technology, which has the advantages of no spatter, no arc light, small welding deformation, high joint quality, etc. The inherent feature of friction stir welding is the "funnel-shaped" temperature distribution in the weld, so the temperature at the bottom of the welded part is lower than that at the top of the welded part, which causes insufficient plastic flow of the material at the bottom of the welded part, and easily causes welding defects such as weak connection at the bottom of the weld, especially in thick plate welding. This phenomenon is particularly obvious, thereby reducing the mechanical properties of the joint.

[0003] In the process of friction stir welding, external ultrasonic vibration and auxiliary heating are added to the weld. The auxiliary heating at the bottom reduces the metal flow resistance and promotes the flow of metal at the bottom of the weld, thereby reducing the tendency of weak connection. The introduction of ultrasonic vibration can effectively inhibit the problem of grain coarsening caused by auxiliary heating. At the same time, the acoustic softening effect of ultrasonic vibration on metal materials can further reduce the flow resistance, refine and homogenize the weld structure, and improve the joint performance. Patent CN105397277A discloses a friction stir welding device with ultrasonic vibration applied at the bottom. However, it does not indicate whether the ultrasonic impact head is coaxial with the stirring head, how the axial force of the contact part between the ultrasonic probe and the welded part is provided, and only the effect of ultrasonic vibration is considered. In addition, how to install the ultrasonic impact head in the limited vertical space from the tool holder of the traditional milling machine to the workbench and ensure that the ultrasonic impact head is coaxial with the stirring head at all times during the welding process.

[0004] In summary, in order to improve the effect of ultrasonic vibration and auxiliary heating at the root of the weld, and solve the problems of installation of the ultrasonic vibration device in a small space and axial force support near the ultrasonic impact head, the present application proposes a bottom ultrasonic vibration and auxiliary heating composite friction stir welding device to solve the problem of installation of the ultrasonic vibration device in a small space. In addition, a heat source is provided to promote the flow of metal at the root of the weld, thereby reducing the tendency of weak connection and improving the mechanical properties of the joint. SUMMARY

[0005] The main purpose of the present application is to provide a bottom ultrasonic vibration and auxiliary heating composite friction stir welding device, which can effectively solve the poor installation effect of the existing ultrasonic vibration device in a small space in the background art, and solve the instability of the axial force support structure near the ultrasonic impact head in the background art. Finally, the welding effect is poor.

[0006] In order to achieve the above object, the technical scheme adopted by the present application is as follows: a bottom ultrasonic vibration and auxiliary heating composite friction stir welding device, comprising a device body arranged on a milling machine, the device body comprising a support table, a stabilizing assembly movably arranged on the support table, a welding assembly arranged on the stabilizing assembly, and a clamping assembly arranged on the support table, the clamping assembly being mainly used for clamping workpieces, the stabilizing assembly being transversely slid on the support table, and the stabilizing assembly being mainly used for driving the welding assembly to transversely slide to realize welding of two workpieces along the gap of the workpieces;

[0007] The stabilizing assembly comprises a stabilizing frame, the stabilizing frame comprising a stabilizing base plate, a stabilizing vertical plate and a stabilizing ring strip, the stabilizing vertical plate being fixedly arranged on the middle part of the upper side of the stabilizing base plate and being perpendicular to the stabilizing base plate, the stabilizing ring strip being fixedly arranged on the upper part of the stabilizing vertical plate, the middle part of the stabilizing vertical plate being provided with a mounting through hole, and the bottom part of the stabilizing vertical plate being provided with a triangular block between the stabilizing base plate, so as to improve the stability between the stabilizing vertical plate and the stabilizing base plate;

[0008] The support table and the stabilizing frame are connected through a movable assembly, the movable assembly comprising a first sliding block oppositely arranged on the inner wall of the bottom part of the support table and a guide rail oppositely arranged on the bottom part of the stabilizing frame, the middle part of the first sliding block being provided with a sliding groove, the guide rail being transversely slid in the sliding groove, the support table being provided with a notch in the middle part, the end part of the stabilizing vertical plate being transversely slid in the notch, and finally the welding assembly is driven to transversely slide, so as to complete the welding of the gap between the two workpieces through the sliding of the welding assembly;

[0009] The welding assembly is mounted in the mounting through hole of the stabilizing vertical plate, the welding assembly comprising a support sleeve, an ultrasonic vibration module, a resistance heating block, a ceramic heat insulation ring and a stirring head, the stabilizing base plate being provided with a circular mounting groove in the bottom part of the mounting through hole, the support sleeve being mounted in the circular mounting groove through screws, the ultrasonic vibration module being mounted in the support sleeve through screws, the upper part of the stabilizing vertical plate being provided with a circular ultrasonic impact hole and a rectangular mounting groove, the circular ultrasonic impact hole being located at the center position of the upper part of the stabilizing vertical plate, the rectangular mounting groove being located on one side of the circular ultrasonic impact hole, the ultrasonic vibration module being located at the lower end of the circular ultrasonic impact hole, the ceramic heat insulation ring being mounted in the rectangular mounting groove, the resistance heating block being arranged in the middle part of the ceramic heat insulation ring, and the stirring head being located directly above the ceramic heat insulation ring.

[0010] Preferably, the bottom of the support table is provided with a square mounting slot, the milling machine is provided with a mounting lug opposite to the square mounting slot, and the mounting lug and the square mounting slot are matched with each other, the square mounting slot and the mounting lug are mainly used for fixing the support table on the milling machine by screws, the mounting position is more accurate, the mounting structure is more stable, and the mounting effect is good.

[0011] Preferably, the number of the welding pieces is two, the two welding pieces are located at the center of the support table, and the center of the welding seam between the two welding pieces is located on the line connecting the circular ultrasonic impact hole and the resistance heating block, so that the welding of the two welding pieces is more accurate.

[0012] Preferably, the clamping assembly comprises two block strips, the two block strips are fixedly arranged on the upper portions of the two sides of the support table by first screws, a plurality of threaded holes are formed in the side portions of the block strips, the plurality of threaded holes are arranged at equal intervals, first screws are threadedly connected into the threaded holes, and the end portions of the first screws are attached to the side walls of the welding pieces. The first screws are mainly used for abutting against the side walls of the two welding pieces, so that the two welding pieces are completely abutted and pressed more tightly.

[0013] Preferably, the clamping assembly further comprises a pressing plate, a pressing block and T-shaped screws, a T-shaped groove is formed in the upper end of the support table, a plurality of T-shaped screws are arranged in the T-shaped groove, a strip-shaped hole is formed in the middle portion of the pressing block, the T-shaped screws pass through the strip-shaped hole, and nuts are threadedly connected to the end portions of the T-shaped screws. The nuts are mainly used for fixing the pressing block, and the pressing block is mainly used for pressing the pressing plate.

[0014] Preferably, a screw hole is formed in the tail portion of the pressing block, a second screw is threadedly connected into the screw hole, the pressing plate is located directly above the two welding pieces, the upper surface of the pressing plate is attached to the lower surface of the end portion of the pressing block, the pressing plate completely presses the welding pieces, according to the length of the welding pieces, the positions of the T-shaped screws in the T-shaped groove are adjusted, and finally welding pieces with different lengths can be fixed firmly, thereby improving the use effect.

[0015] Preferably, a plurality of support rib plates are arranged in the interiors of the two sides of the support table, the plurality of support rib plates are arranged at equal intervals, and the support rib plates are mainly used for enhancing the strength of the support table and improving the bearing capacity of the support table.

[0016] Preferably, the second sliding block is arranged at the end portion of the stabilizing ring strip, and the second sliding block is used in cooperation with the milling machine. When the stabilizing frame slides transversely, the stabilizing ring strip slides transversely, and the end portion of the stabilizing ring strip slides transversely on the milling machine in cooperation with the second sliding block.

[0017] Preferably, the ultrasonic impact head vibrates its ultrasonic impact hole in the steady frame ultrasonic impact hole, the diameter of the ultrasonic impact hole is increased by one millimeter than the diameter of the ultrasonic impact head, in order to facilitate the welded welding part to follow the movement of the support platform, high temperature lubricating grease is applied on the surface of the steady frame in contact with the welding part before the welding starts, the axial clamping force of the welding part is provided by the pressing block, the size of the downward pressure on the welding part is adjusted by the tail screw of the pressing block, and the lateral tightening force of the welding part is provided by the first screw rod on the side of the welding part.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] In the application, the positions to be welded of the two welding parts are heated by the resistance heating block to reduce the plastic deformation resistance during the welding process, and then the ultrasonic vibration module is used to reduce the grain coarsening problem caused by auxiliary heating, and the ultrasonic vibration can further reduce the deformation resistance of the metal and promote the flow of the metal at the root of the weld, so that the welding quality is improved.

[0020] In the application, the axial pressure from the stirring head is mainly borne by the welding part and the support platform during the welding process, the ultrasonic vibration module and the stirring head are coaxial at all times during the welding, the ultrasonic vibration energy is applied to the part of the welding part being stirred by the stirring head perpendicularly to the welding part, the ultrasonic vibration energy is applied in a way to refine the grains and reduce the flow stress of the metal, that is, the auxiliary heating and the ultrasonic vibration are used to increase the heat at the bottom of the weld at the same time, so that the flowability of the metal at the bottom is enhanced, the grain coarsening is inhibited, the weak connection tendency is reduced, and the welding quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is an explosion structure schematic view of the composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating of the application

[0022] Figure 2 It is an overall structure schematic view of the composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating of the application

[0023] Figure 3 It is an overall structure schematic view of the support platform in the composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating of the application

[0024] Figure 4 It is an overall structure schematic view of the steady frame in the composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating of the application

[0025] Figure 5 It is an overall structure schematic view of the support sleeve in the composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating of the application

[0026] Figure 6It is a whole structure schematic view of the ultrasonic vibration module in the bottom ultrasonic vibration and auxiliary heating composite friction stir welding device of the application;

[0027] Figure 7 It is a whole structure schematic view of the ceramic heat insulation ring in the bottom ultrasonic vibration and auxiliary heating composite friction stir welding device of the application;

[0028] Figure 8 It is a whole structure schematic view of the resistance heating block in the bottom ultrasonic vibration and auxiliary heating composite friction stir welding device of the application.

[0029] In the figure: 1, guide rail; 2, pressing plate; 3, first screw; 4, stop block strip; 5, first screw rod; 6, welding piece; 7, pressing block; 8, second screw; 9, nut; 10, resistance heating block; 11, ceramic heat insulation ring; 12, stirring head; 13, first sliding block; 14, stabilizing frame; 15, support table; 16, second sliding block; 17, ultrasonic vibration module; 18, support sleeve; 19, T-shaped screw rod; 1401, stabilizing bottom plate; 1402, stabilizing vertical plate; 1403, stabilizing ring strip. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application will be further described below in combination with specific embodiments.

[0031] In the description of the application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0033] Please refer to Figures 1-8As shown, the present application is a kind of bottom ultrasonic vibration and auxiliary heating composite friction stir welding device, including the device body arranged on milling machine, the device body includes support table 15, the stable assembly movably arranged on support table 15, the welding assembly arranged on stable assembly, the clamping assembly arranged on support table 15, clamping assembly is mainly used for clamping welding piece 6, stable assembly is transversely slid on support table 15, stable assembly is mainly used for driving welding assembly transversely slide and realizes the welding of two welding pieces 6 along the gap of welding piece 6;

[0034] Stable assembly includes stable frame 14, stable frame 14 includes stable bottom plate 1401, stable vertical plate 1402 and stable ring strip 1403, stable vertical plate 1402 is fixedly arranged on the upper side middle part of stable bottom plate 1401, and stable vertical plate 1402 is perpendicular to stable bottom plate 1401, stable ring strip 1403 is fixedly arranged on the upper part of stable vertical plate 1402, stable vertical plate 1402 middle part is equipped with mounting through hole, and the bottom of stable vertical plate 1402 is equipped with triangular block between stable bottom plate 1401, the stability between stable vertical plate 1402 and stable bottom plate 1401 is improved through triangular block;

[0035] Support table 15 and stable frame 14 are connected through movable assembly, movable assembly includes first slider 13 oppositely arranged on the inner wall of the bottom of support table 15 and guide rail 1 oppositely arranged on the bottom of stable frame 14, first slider 13 middle part is equipped with sliding slot, guide rail 1 is transversely slid in sliding slot, through the transverse sliding of guide rail 1 in the sliding slot of first slider 13, stable frame 14 is driven to transversely slide, support table 15 middle part is equipped with notch, stable vertical plate 1402 end part passes through notch and is transversely slid in notch, finally realizes the transverse sliding of welding assembly driven, through the sliding of welding assembly, the welding of the gap between two welding pieces 6 is completed;

[0036] The welding assembly is installed in the mounting through hole of the stable vertical plate 1402, and the welding assembly comprises the support sleeve 18, the ultrasonic vibration module 17, the resistance heating block 10, the ceramic heat insulation ring 11 and the stirring head 12. A circular mounting groove is formed in the stable bottom plate 1401 and located at the bottom of the mounting through hole. The support sleeve 18 is installed in the circular mounting groove through screws. The ultrasonic vibration module 17 is installed in the support sleeve 18 through screws. A circular ultrasonic impact hole and a rectangular mounting groove are formed in the upper portion of the stable vertical plate 1402. The circular ultrasonic impact hole is located at the center of the upper portion of the stable vertical plate 1402. The rectangular mounting groove is located on one side of the circular ultrasonic impact hole. The ultrasonic vibration module 17 is located at the lower end of the circular ultrasonic impact hole. The ceramic heat insulation ring 11 is installed in the rectangular mounting groove. The resistance heating block 10 is arranged in the middle portion of the ceramic heat insulation ring 11. The stirring head 12 is located directly above the ceramic heat insulation ring 11. In the welding process, the positions to be welded of the two welding pieces 6 are first heated by the resistance heating block 10 to reduce the plastic deformation resistance thereof. Then, the ultrasonic vibration module 17 is used to reduce the grain coarsening problem caused by auxiliary heating. At the same time, the ultrasonic vibration can further reduce the deformation resistance of the metal, promote the flow of the metal at the root of the weld, and thus improve the welding quality.

[0037] In the welding process, the axial pressure from the stirring head 12 is mainly borne by the welding pieces 6 and the support table 15. In the welding process, the ultrasonic vibration module 17 and the stirring head 12 are coaxial at all times. The ultrasonic vibration energy is applied to the part of the welding piece 6 being stirred by the stirring head 12 in a perpendicular manner. The ultrasonic vibration energy is used to refine the grains and reduce the flow stress of the metal. That is, the simultaneous action of the auxiliary heating and the ultrasonic vibration is used to increase the heat at the bottom of the weld, increase the flowability of the metal at the bottom, and inhibit the grain coarsening, so as to reduce the weak connection tendency and improve the welding quality.

[0038] The bottom of the support table 15 is provided with a square mounting groove. The milling machine is provided with a mounting protrusion opposite to the square mounting groove. The square mounting groove and the mounting protrusion are matched with each other. The square mounting groove and the mounting protrusion are mainly used for fixing and installing the support table 15 on the milling machine through screws. The mounting position is more accurate, the mounting structure is more stable, and the mounting effect is good.

[0039] The number of the welding pieces 6 is two. The two welding pieces 6 are located at the center of the support table 15. The center of the weld between the two welding pieces 6 is located on the line connecting the circular ultrasonic impact hole and the resistance heating block 10. The welding of the two welding pieces 6 is more accurate.

[0040] The clamping assembly comprises two stop block strips 4, which are fixedly arranged on the upper parts of the two sides of the support table 15 through the first screw 3, a plurality of threaded holes are formed in the side of the stop block strip 4 and are arranged at equal intervals, the first screw 5 is threadedly connected in the threaded hole, the end of the first screw 5 is attached to the side wall of the welding part 6, and the first screw 5 is mainly used for abutting against the side wall of the two welding parts 6, so that the two welding parts 6 are completely abutted and are pressed more tightly.

[0041] The clamping assembly further comprises a pressing plate 2, a pressing block 7 and a T-shaped screw 19, a T-shaped groove is formed in the upper end of the support table 15, the T-shaped screw 19 is arranged in the T-shaped groove, a strip-shaped hole is formed in the middle of the pressing block 7, the T-shaped screw 19 passes through the strip-shaped hole, and the nut 9 is threadedly connected to the end of the T-shaped screw 19, the nut 9 is mainly used for fixing the pressing block 7, and the pressing block 7 is mainly used for pressing the pressing plate 2.

[0042] The second screw 8 is threadedly connected to the screw hole in the tail of the pressing block 7, the pressing plate 2 is located directly above the two welding parts 6, the upper surface of the pressing plate 2 is attached to the lower surface of the end of the pressing block 7, the pressing plate 2 completely presses the welding parts 6, according to the length of the welding part 6, the position of the T-shaped screw 19 in the T-shaped groove is adjusted, and finally the welding part 6 with different lengths can be fixed firmly, and the use effect is improved.

[0043] The inside of the two sides of the support table 15 is provided with a plurality of support rib plates, the plurality of support rib plates are arranged at equal intervals, and the support rib plates are mainly used for enhancing the strength of the support table 15 and improving the bearing capacity of the support table 15.

[0044] The end of the stable ring strip 1403 is provided with the second sliding block 16, and the second sliding block 16 is used in cooperation with the milling machine; when the stable frame 14 slides transversely, the stable ring strip 1403 slides transversely, and the end of the stable ring strip 1403 slides transversely on the milling machine in cooperation with the second sliding block 16.

[0045] The diameter of the ultrasonic impact hole of the stable frame 14 is increased by one millimeter than the diameter of the ultrasonic impact head, in order to facilitate the movement of the welded welding part 6 along with the support table 15, high-temperature lubricating grease is applied to the contact part between the upper surface of the stable frame 14 and the welding part 6 before welding starts, the axial clamping force of the welding part 6 is provided by the pressing block 7 and is adjusted by the tail screw of the pressing block 7, the side pressing force of the welding part 6 is provided by the first screw 5 on the side of the welding part 6.

[0046] The working principle of the present application is as follows: Figures 1-8As shown, the application is a kind of bottom ultrasonic vibration and auxiliary heating composite friction stir welding device, support table 15 is installed on the milling machine workbench by fixing screw, then install the second sliding block 16 in the reserved screw hole position at the bottom of support table 15; After guide rail 1 is fixedly installed in the rectangular groove on the back of the bottom of stabilizing frame 14, support sleeve 18 is fixedly installed in the circular groove at the bottom of stabilizing frame 14, and then the flange of ultrasonic vibration module 17 is fixedly installed on the upper part of support sleeve 18 by screw; After ceramic heat insulation ring 11 is put into the square groove on the upper part of stabilizing frame 14, resistance heating block 10 is put into ceramic heat insulation ring 11; Then the guide rail 1 at the bottom of stabilizing frame 14 is matched with the second sliding block 16 installed on the bottom of support table 15, so that the guide rail 1 slides horizontally in the second sliding block 16 during sliding; Stop block strip 4 is installed on both sides of the upper part of support table 15 by screw, the two welding pieces 6 to be welded are placed at the center of support table 15, so that the center of weld passes through the connecting line of the circular ultrasonic impact hole on the upper part of stabilizing frame 14 and the heating block, then the pressing plate 2 is placed on the upper surface of the two welding pieces 6 to be welded, the T-shaped screw rod 19 is installed in the T-shaped groove on the upper surface of support table 15, then the second screw 8 is screwed into the screw hole at the tail of pressing block 7, finally the T-shaped screw rod 19 passes through the long slot of pressing block 7 and is tightened with nut 9 to press the pressing plate 2 tightly, then the power supply of ultrasonic vibration module 17 and resistance heating block 10 is turned on to start welding.

[0047] The basic principles and main features of the application and the advantages of the application are shown and described above. It should be understood by those skilled in the art that the application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the claimed application. The scope of protection of the application is defined by the appended claims and their equivalents.

Claims

1. A composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating, comprising a device body mounted on a milling machine, characterized in that: The device body includes a support platform (15), a stabilizing component movably mounted on the support platform (15), a welding component mounted on the stabilizing component, and a clamping component mounted on the support platform (15). The clamping component is mainly used to clamp the weldment (6). The stabilizing component includes a stabilizing frame (14), which includes a stabilizing base plate (1401), a stabilizing upright plate (1402), and a stabilizing ring (1403). The stabilizing upright plate (1402) is fixedly disposed on the upper middle part of the stabilizing base plate (1401), and the stabilizing upright plate (1402) is perpendicular to the stabilizing base plate (1401). The stabilizing ring (1403) is fixedly disposed on the upper part of the stabilizing upright plate (1402). The support platform (15) and the stabilizer (14) are connected by a movable component. The movable component includes a first slider (13) disposed on the inner wall of the bottom of the support platform (15) and a guide rail (1) disposed on the bottom of the stabilizer (14). The first slider (13) has a groove in the middle and the guide rail (1) slides laterally in the groove. The support platform (15) has a notch in the middle and the end of the stabilizer plate (1402) passes through the notch and slides laterally in the notch. The welding assembly includes a support sleeve (18), an ultrasonic vibration module (17), a resistance heating block (10), a ceramic heat insulation ring (11), and a stirring head (12). A circular mounting groove is provided on the stable base plate (1401). The support sleeve (18) is installed in the circular mounting groove by screws. The ultrasonic vibration module (17) is installed in the support sleeve (18) by screws. A circular ultrasonic impact hole and a rectangular mounting groove are provided on the upper part of the stable plate (1402). The circular ultrasonic impact hole is located at the center of the upper part of the stable plate (1402). The rectangular mounting groove is located on one side of the circular ultrasonic impact hole. The ultrasonic vibration module (17) is located directly below the circular ultrasonic impact hole. The ceramic heat insulation ring (11) is installed in the rectangular mounting groove. The resistance heating block (10) is located in the middle of the ceramic heat insulation ring (11). The stirring head (12) is located directly above the ceramic heat insulation ring (11). The bottom of the support platform (15) has a square mounting groove, and the milling machine is provided with mounting protrusions, which are adapted to the square mounting groove. There are two weldment pieces (6), and the two weldment pieces (6) are located at the center of the support platform (15), and the center of the weld between the two weldment pieces (6) is located on the line connecting the circular ultrasonic impact hole and the resistance heating block (10).

2. The composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating according to claim 1, characterized in that: The clamping assembly includes two stop bars (4), which are fixedly mounted on the upper sides of the support platform (15) by a first screw (3). The side of the stop bar (4) is provided with a plurality of threaded through holes, which are distributed in an array at equal intervals. A first screw (5) is threadedly connected to the threaded through hole, and the end of the first screw (5) is in contact with the side wall of the weldment (6).

3. The composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating according to claim 2, characterized in that: The clamping assembly also includes a pressure plate (2), a pressure block (7), and a T-shaped screw (19). The upper end of the support platform (15) is provided with a T-shaped groove, and a plurality of the T-shaped screws (19) are arranged in the T-shaped groove. The pressure block (7) is provided with a strip-shaped through hole in the middle, and the T-shaped screw (19) passes through the strip-shaped through hole. The end of the T-shaped screw (19) is threaded with a nut (9).

4. The composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating according to claim 3, characterized in that: The tail of the pressure block (7) is provided with a screw through hole, and a second screw (8) is threaded into the screw through hole. The pressure plate (2) is located directly above the two welded parts (6), and the upper surface of the pressure plate (2) is in contact with the lower surface of the end of the pressure block (7).

5. The composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating according to claim 1, characterized in that: The support platform (15) has several support ribs on both sides, and the support ribs are arranged in an array at equal intervals.

6. The composite friction stir welding device with bottom ultrasonic vibration and auxiliary heating according to claim 1, characterized in that: The end of the stabilizing ring (1403) is provided with a second slider (16), which is used in conjunction with a milling machine.

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