Filling wire friction stir welding device and method capable of accurately regulating and controlling tissue

Abstract

The invention provides a wire filling friction stir welding device and method capable of achieving tissue precise regulation and control, and belongs to the technical field of friction stir welding. Through integration of the wire filling thickening module and the fiber reinforcement body, the inherent welding seam thinning problem and the heat affected zone softening problem in friction stir welding are solved, precise supplement of local materials of the welding seam is achieved through wire filling thickening, the fiber reinforcement body forms a gradient structure through shearing dispersion, the joint strength is improved, the width of the thickening area is adjustable, and the friction stir welding efficiency is improved. And the welding quality is improved. The device comprises a wire filling friction stir welding module, a telescopic shaft shoulder module and a fiber winding module. The wire filling friction stir welding module is composed of a stirring tool and a static shaft sleeve, the stirring tool is connected with the spindle rotating part, the static shaft sleeve is connected with the spindle static part, and a gap is formed between the stirring tool and the static shaft sleeve. The telescopic shaft shoulder module is connected with the static shaft sleeve through a transmission connecting rod mechanism; the fiber winding module is connected with the static shaft sleeve.

Description

Technical Field

[0001] This invention relates to a feed wire friction stir welding apparatus and method for precise control of the structure, specifically belonging to the field of friction stir welding technology. Background Technology

[0002] Friction stir welding, a solid-state joining technology, utilizes a high-speed rotating stirring head (composed of a stirring pin and a shoulder) to generate heat through friction with the workpiece, softening the material to a plastic state. The moving stirring head then mixes and presses the plastic material, ultimately completing the weld. This technique avoids the inherent defects of material melting in traditional fusion welding processes, providing a new path for high-quality joining of lightweight alloys and difficult-to-weld materials. With its advantages of excellent weld mechanical properties, minimal welding deformation, and environmental friendliness, this technology is widely used in aerospace (e.g., aircraft fuselages, rocket fuel tanks), rail transportation (e.g., high-speed rail aluminum alloy bodies), shipbuilding and marine engineering (e.g., aluminum alloy ship hulls), and automotive and power battery industries (e.g., new energy vehicle battery trays, battery casings).

[0003] In friction stir welding, the high-speed rotating stirring head shoulder presses into the workpiece surface to achieve frictional heat generation and forging densification. This pressing process easily causes surface material to be squeezed out, forming flash, which in turn causes the weld area to be lower than the base metal plane, resulting in weld thinning. Weld thinning can be eliminated by pre-filling or adding material during welding to replenish material loss in the weld area, but this is cumbersome and the filler material is easily rolled out of the weld by the stirring pin. Simultaneously, because the heat-affected zone (HAZ) of the friction stir weld joint is only subjected to the welding thermal cycle and not mechanical stirring, the second-phase particles undergo re-dissolution and growth. After cooling, only a small amount of coarse second-phase particles precipitate, failing to restore the original strengthening effect. The HAZ of the joint easily becomes a stress concentration zone under load, leading to crack propagation. A gradient structure design for the HAZ composition before welding allows its thermal sensitivity to gradually transition with changes in composition, avoiding concentrated dissolution of strengthening phases or abnormal grain coarsening. However, the complex manufacturing process and difficulty in controlling precision limit its large-scale application. Meanwhile, in complex irregular structures, due to the load gradient distribution in different parts of the service environment, in order to ensure the improvement of the load-bearing capacity of weak parts, the structure of special parts will be thickened before welding.

[0004] However, existing technologies are complex and costly to process. To achieve precise adaptation of the thickened area in the width direction and save costs, a filler wire friction stir welding device and method for localized weld thickening and precise microstructure control is urgently needed to solve these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a filler wire friction stir welding device and method for local thickening of weld and precise control of microstructure, so as to solve the inherent problems of weld thinning (such as material loss caused by flash) and softening of heat-affected zone (such as coarsening of the second phase) in friction stir welding.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The invention includes a wire-filled friction stir welding module, a telescopic shoulder module, and a fiber winding module; the wire-filled friction stir welding module consists of a stirring tool and a stationary bushing. The stirring tool is fixedly connected to the rotating part of the main shaft through the milled plane of the clamping part, and the stationary bushing is fixedly connected to the stationary part of the main shaft through the clamping plane, and a gap is provided between the stirring tool and the stationary bushing; the telescopic shoulder module is connected to the side wall of the stationary bushing through a transmission linkage mechanism, wherein the slide rail of the transmission linkage mechanism is fixed to the side wall of the stationary bushing, and the slider moves along the slide rail and self-locks, which is used to drive the telescopic shoulder to linearly adjust the size; the fiber winding module is fixedly connected to the lower part of the stationary bushing, and the connection method from top to bottom is the main shaft stationary part, the stationary bushing, and the fiber winding module; through the size adjustment of the telescopic shoulder module and the wire-filling action of the wire-filled friction stir welding module, the local thickening of the weld is achieved, and the microstructure gradient is controlled by the dispersion of the fiber reinforcement of the fiber winding module.

[0007] Furthermore, the filler module achieves local thickening, the fiber winding module introduces microstructure control, and the telescopic shoulder module ensures precise fit. The integration of these modules solves the fundamental problems of weld thinning and microstructure softening. Moreover, the simultaneous operation of fiber winding and filler improves welding efficiency and quality consistency.

[0008] The mixing tool includes a clamping part, a spiral part, and a mixing head. The spiral part is a hard alloy or diamond-coated structure and is used to shear the filament body and fiber reinforcement. Furthermore, by limiting the material of the spiral section, the wear problem in fiber shearing is solved, the life of the device is extended and continuous shearing efficiency is ensured, the problem of process interruption caused by easy wear of shearing tools is avoided, and the stability of the device is improved. The refined design of the spiral section enables the filament body and fibers to be uniformly sheared into particles, promotes the gradient distribution of the weld structure, and thus enhances the mechanical properties.

[0009] The stationary bushing is provided with a clamping plane, a wire feed port and a shoulder expansion groove. The wire feed port is the entrance for the wire body to enter the interior of the stationary bushing. The gap between the stirring tool and the stationary bushing is 0.1-0.2mm, and the root plane of the stirring head is 0.2-0.3mm lower than the plane of the stationary bushing. Furthermore, by quantifying the gaps and positions, the precision of material deposition is ensured, thereby eliminating flash and avoiding defects such as incomplete soldering; the design of the stationary bushing supports the connection with the telescopic shoulder module, enhancing the adaptability of the device and making it usable for plates of different thicknesses.

[0010] The shoulder telescopic groove engages with the slide rail of the transmission linkage mechanism, allowing the movement of the slider to directly drive the shoulder telescopic part to linearly extend and retract within the shoulder telescopic groove. The telescopic shoulder module includes a transmission linkage mechanism, a shoulder fixing part, and a shoulder telescopic part. The shoulder fixing part is equipped with a servo motor and a threaded shaft. The servo motor drives the threaded shaft to rotate, which in turn controls the ball nut to move the telescopic shoulder, thus driving the movement of the shoulder telescopic part. In the transmission linkage mechanism, the fixing block is connected to the upper surface of the shoulder telescopic part, and the slider provides support after self-locking to ensure load-bearing capacity. Furthermore, the shoulder size can be adjusted in real time through the transmission linkage mechanism to adapt to the thickening requirements of different weld widths, avoiding the limitations of traditional fixed shoulders. By combining servo motor control, the intelligence level of the device is improved, precise pressure control is achieved, and manual intervention is reduced.

[0011] The fiber winding module includes a drive mechanism, a fiber winding mechanism, and a filament body. The drive mechanism consists of a torque motor and a drive gear, which is used to control the fiber tension. The fiber winding mechanism includes a driven gear, a fiber spool, and a fiber reinforcement. The fiber spool is fixed on the driven gear. Furthermore, by limiting the fiber type and coating, the problems of galvanic corrosion and wettability were solved, and the interfacial bonding and corrosion resistance were enhanced. The integration of the torque motor enabled real-time monitoring of winding tension, ensuring uniform fiber distribution and avoiding breakage or accumulation, thereby improving the consistency of the structure.

[0012] The wire body is made of aluminum, magnesium, titanium or their alloys, the fiber reinforcement is made of carbon fiber, boron fiber, silicon carbide fiber or alumina fiber, and the surface of the fiber reinforcement is coated with an insulating coating. The device is suitable for friction stir welding in the aerospace, rail transportation, shipbuilding and automotive fields. Furthermore, by limiting the materials and applications of the filament body and fiber reinforcement, the device is directly targeted at high-value industries, enhancing its commercial appeal and ensuring its reliability under harsh operating conditions, thus demonstrating its industrial applicability.

[0013] The beneficial effects of this invention are: 1. By integrating the filler wire thickening module and the fiber reinforcement, this invention directly solves the inherent weld thinning problems (such as material loss due to flash) and heat-affected zone softening (such as second-phase coarsening) in friction stir welding. The filler wire thickening achieves precise replenishment of local weld material, while the fiber reinforcement forms a gradient structure through shear dispersion, improving joint strength. Compared to existing technologies (such as pre-filled materials), this device is easy to operate, the width of the thickened area is adjustable, material curling is avoided, and welding quality is improved.

[0014] 2. The addition of fiber-wound modules (such as carbon fiber or silicon carbide fiber) enables a gradient design of the weld composition, strengthening interfacial bonding through uniform particle distribution after shearing. The insulating coating eliminates the risk of galvanic corrosion and improves wettability. This not only enhances mechanical properties (such as tensile strength and fatigue life) but also strengthens corrosion resistance, expanding the application potential of the weld in complex conditions (such as the high-temperature environments of aerospace).

[0015] 3. Through modular design (such as adjustable telescopic shoulders and controllable fiber winding), this device is adaptable to welds of different shapes and sizes, optimizing simple butt joints into lap joint structures and supporting the connection of dissimilar materials (such as aluminum-titanium composites). Simultaneously, localized thickening reduces overall material usage, achieving lightweight joints that meet the weight reduction and cost control requirements of the automotive, new energy, and other fields.

[0016] 4. Integrating wire feeding, shearing, forging, and control into a single unit reduces equipment changeover and manual intervention. The combination of heat-affected zone texturing and shoulder forging ensures stability during long-term service, avoids stress concentration and crack propagation, and is suitable for large-scale industrial applications. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the filler wire friction stir welding module of the present invention; Figure 3 This is a schematic diagram of the shoulder telescopic module structure of the present invention; Figure 4 This is a schematic diagram of the transmission linkage mechanism of the present invention; Figure 5 This is a schematic diagram of the fiber winding module structure of the present invention; Figure 6 This is a schematic diagram of the filler wire friction stir welding process of the present invention.

[0018] 1. Wire-filled friction stir welding module; 101. Stirring tool; 102. Stationary bushing; 10101. Clamping part; 10102. Spiral part; 10103. Stirring head; 10201. Clamping plane; 10202. Wire feed inlet; 10203. Shoulder telescopic groove; 2. Shoulder telescopic module; 201. Transmission linkage mechanism; 202. Shoulder fixing part; 203. Shoulder telescopic part; 20101. Slide rail; 20102. Slider; 20 103. Fixing block; 20201. Servo motor; 20202. Threaded shaft; 20203. Fixing shoulder; 20301. Ball nut; 20302. Telescopic shoulder; 3. Fiber winding module; 301. Drive mechanism; 302. Fiber winding mechanism; 303. Fiber body; 30101. Torque motor; 30102. Drive gear; 30201. Fiber roll; 30202. Driven gear; 30203. Fiber reinforcement. Detailed Implementation

[0019] The following will be combined with the appendix Figure 1-6 The technical solutions in the embodiments are described clearly and completely.

[0020] Specific implementation method one: as follows Figure 1-6 As shown, the device consists of three parts: a wire-filled friction stir welding module 1, a telescopic shoulder module 2, and a fiber winding module 3. The wire-filled friction stir welding module consists of a stirring tool 101 and a stationary bushing 102. The stationary bushing 102 is connected to the stationary part of the main shaft by bolts, and the stirring tool 101 is connected to the rotating part of the main shaft by fastening screws. The fiber winding module 3 is connected to the stationary bushing 102 by bolts. The connection method from top to bottom is the stationary part of the main shaft, the stationary bushing 102 and the fiber winding module 3. The telescopic shoulder module 2 is connected to the stationary bushing 102 through a transmission linkage mechanism 201. The filler wire friction stir welding module includes two parts: a stirring tool 101 and a stationary bushing 102. The stirring tool 101 consists of three parts: a clamping part 10101, a spiral part 10102, and a stirring head 10103. The clamping part has a milled surface and is connected to the main shaft rotating part by fastening screws. The spiral part 10102 is the shearing part of the wire body 303. When the wire feeding mechanism feeds the wire body 303 with uniformly distributed fiber reinforcement 30203 on the surface through the feeding hole 10202 of the stationary bushing, the high-speed rotating spiral part 10102 shears the wire body 303 and the surface fibers 30203 into small particles. The spiral part 10102 is a hard alloy structure or has a diamond coating on the surface to ensure continuous shearing of the fibers. The stationary bushing 102 consists of a clamping plane 10201, a wire feed inlet 10202, and a shoulder telescopic groove 10203. The clamping plane 10201 is connected to the stationary part of the main shaft by bolts. The gap between the stirring tool 101 and the stationary bushing 102 is 0.1-0.2 mm. The root plane of the stirring head 10103 is lower than the stationary bushing 102 by a distance of 0.2-0.3 mm. The wire feed inlet 10202 is the entrance for the wire body 303 to enter the interior of the stationary bushing 102. The telescopic shoulder module 2 consists of a transmission linkage mechanism 201, a shoulder fixing part 202, and a shoulder telescopic part 203. The transmission linkage mechanism 201 consists of a slide rail 20101, a slider 20102, and a fixing block 20103. The slide rail 20101 is connected to the side wall of the stationary bushing 102. The slider 20102 is located on the slide rail 20101 and can move up and down along the slide rail. When the slider 20102 moves to a set position, it can achieve self-locking. The fixing block 20103 is connected to the upper surface of the shoulder telescopic part 203 and moves together with the shoulder telescopic part 203. When the fixing block 20103 moves, it drives the slider 20102 to move up and down along the slide rail 20101. When the slider 20102 achieves self-locking... The locking transmission linkage mechanism supports the shoulder telescopic part 203, ensuring its load-bearing capacity. The shoulder fixing part 202 consists of a fixed shoulder 20203, a servo motor 20201, and a threaded shaft 20202. The shoulder plane can constrain and forge the sheared plastic material. The servo motor 20201 can drive the threaded shaft 20202 to rotate, thereby controlling the movement of the ball nut 20301. The shoulder telescopic part 203 consists of a ball nut 20301 and a telescopic shoulder 20302. When the ball nut 20301 moves on the threaded shaft 20202, it can synchronously drive the telescopic shoulder 20302 to move, realizing the change of the shoulder size of the stationary bushing 102. The fiber winding module 3 consists of a drive mechanism 301, a fiber winding mechanism 302, and a filament body 303. The drive mechanism 301 consists of a drive gear 30102 and a torque motor 30101. The torque motor 30101 can detect and adjust the tension of the fiber in real time during the winding process to ensure tension stability. The fiber winding mechanism 302 consists of a driven gear 30202, a fiber spool 30201, and a fiber reinforcement 30203. The fiber spool 30201 is fixed on the driven gear 30202 and rotates around the filament body 303 together with the driven gear 30202. During the rotation, the fiber reinforcement 30203 is evenly wound on the surface of the filament. The metal filament body 303 mainly uses aluminum, magnesium, titanium, and their alloys. The fiber reinforcement 30203 includes carbon fiber, boron fiber, silicon carbide fiber, and alumina fiber. The fiber surface is coated with an insulating coating, which eliminates the risk of galvanic corrosion and improves the wettability with the board, strengthening the interfacial bonding ability.

[0021] Specific Implementation Method Two: The basic method of wire-filled friction stir welding includes the following three steps: Step 1: Before the test, the surface of the plate is polished, and the heat-affected zone is roughened. After welding begins, the spindle rotating part starts to rotate, and the stirring tool 101 begins to penetrate the substrate according to the set program. After the stirring head 10103 is completely penetrated into the substrate, the stationary bushing 102 maintains a certain distance from the substrate because the shoulder plane of the stationary bushing 102 is higher than the root shoulder plane of the stirring head 10103 during assembly. When the weld structure does not require thickening treatment, the root shoulder plane of the stirring tool 101 constrains and presses the substrate material, and the stirring head 10103 connects the substrate material. Step 2: When the weld seam needs to be thickened, the preset program controls the wire body 303 to start feeding; the active gear 30102 of the fiber winding part drives the driven gear 30202 to start rotating, and at the same time drives the fiber roll 30201 to rotate. The fiber reinforcement 30203 is evenly wound on the surface of the wire body 303 as the wire body 303 moves and is fed into the interior of the stationary bushing 102 from the feed port 10202; under the shearing of the spiral part 10102, the wire body 303 becomes granular and moves downward along the thread groove. When the granules reach the gap between the stationary bushing 102 and the substrate, they are deposited on the substrate surface under the constraint of the shoulder plane. Step 3: After reaching the preset pressure value, the spindle begins to move to connect the substrate and the filler material; in the telescopic shoulder module 2, the servo motor 20201 controls the ball nut 20301 to move on the threaded shaft 20202, thereby controlling the telescopic part 203 of the shoulder to move together, adjusting the size of the stationary bushing 102 to achieve precise control of the size of the weld surface cover layer; after the surface of the heat-affected zone is roughened, under the forging action of the shoulder, the high-temperature plastic material and the heat-affected zone structure undergo mutual diffusion to achieve a good bond.

[0022] Workflow: First, the surface of the plates to be welded is ground to remove the oxide layer, and the heat-affected zone is roughened (e.g., laser roughening) to enhance the bonding strength; each module of the device is inspected to ensure that the gap between the stirring tool 101 of the wire-filled friction stir welding module 1 and the stationary bushing 102 is 0.1-0.2mm, the fiber roll 30201 of the fiber winding module 3 is loaded, and the transmission linkage mechanism 201 of the telescopic shoulder module 2 is in the initial position. The overall structure of the device is as follows: Figure 1 As shown; When the main shaft is started, the stirring tool 101 is driven into the substrate at high speed (e.g., 1000-2000 rpm). The stirring head 10103 first contacts the substrate. Since the shoulder plane of the stationary bushing 102 is higher than the root of the stirring head, the stationary bushing 102 maintains a gap with the substrate to avoid premature interference. At this stage, the frictional heat generated by the stirring needle is mainly relied on to soften the substrate material to a plastic state. When the weld seam needs to be locally thickened, the control system is activated to fill the wire, feeding the wire body 303 from the wire feeding mechanism through the wire feed port 10202 of the stationary bushing 102. At the same time, the torque motor 30101 of the fiber winding module 3 drives the drive gear 30102, causing the drive gear 30102 to drive the driven gear 30202 to rotate, so that the fiber roll 30201 evenly winds the fiber reinforcement 30203 onto the surface of the wire body 303. During the winding process, the tension is monitored in real time by the torque motor 30101 to ensure the stability of the process. The wire body 303 and the fiber enter the spiral part 10102 of the stirring tool 101 and are sheared into granules at high speed. The sheared particles move downward along the spiral groove and are deposited in the gap between the stationary bushing 102 and the substrate. At this time, the telescopic shoulder module 2 starts to work, controlling the servo motor 20201 to drive the threaded shaft 20202 to rotate, so that the ball nut 20301 drives the telescopic shoulder 20302 to move. The thickness of the deposited layer is controlled by adjusting the shoulder size. The slider 20102 of the transmission linkage mechanism 201 moves along the slide rail 20101 and self-locks to ensure the load-bearing capacity of the shoulder. The shoulder plane constrains and forges the plastic material to achieve densification. When the pressure sensor detects the preset pressure value (e.g., 50-100MPa), the spindle begins to move along the welding direction, so that the substrate material and the filler particles are fully stirred and mixed. Under the roughening treatment and forging, the heat-affected zone diffuses and combines with the filler material to form a gradient structure. After welding is completed, the stirring tool is retrieved and the surface flatness and thickness of the weld are checked. The whole process achieves a high-strength connection without thinning.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A precision control of tissue filling friction stir welding device, characterized by, comprising a filling friction stir welding module (1), a telescopic shoulder module (2) and a fiber winding module (3); the filling friction stir welding module (1) is composed of a stirring tool (101) and a static shaft sleeve (102), the stirring tool (101) is fixedly connected with the main shaft rotating part through the milling plane of the clamping part (10101), the static shaft sleeve (102) is fixedly connected with the main shaft static part through the clamping plane (10201), and a gap is provided between the stirring tool (101) and the static shaft sleeve (102); The telescopic shoulder module (2) is connected with the side wall of the static shaft sleeve (102) through a transmission linkage mechanism (201), wherein the slide rail (20101) of the transmission linkage mechanism (201) is fixed to the side wall of the static shaft sleeve (102), the sliding block (20102) moves along the slide rail (20101) and is self-locked, and is used for driving the shaft shoulder telescopic part (203) to linearly adjust the size; the fiber winding module (3) is fixedly connected with the lower part of the static shaft sleeve (102), and the connection mode is from top to bottom in turn as the main shaft static part, the static shaft sleeve (102) and the fiber winding module (3); through the size adjustment of the telescopic shoulder module (2) and the filling action of the filling friction stir welding module (1), the local thickening of the weld is realized, and the gradient control of the tissue is realized by the dispersion of the fiber reinforcement (30203) of the fiber winding module (3).

2. The precision tissue-regulated pin-welding friction stir welding device of claim 1, wherein, The stirring tool (101) comprises a clamping part (10101), a spiral part (10102) and a stirring head (10103), and the spiral part (10102) is a hard alloy or diamond coating structure, which is used for shearing the wire body (303) and the fiber reinforcement (30203).

3. The precision tissue control wire feeding friction stir welding device of claim 1, wherein, The static shaft sleeve (102) is provided with a clamping plane (10201), a wire feeding port (10202) and a shaft shoulder telescopic groove (10203), the wire feeding port (10202) is an entrance for the wire body (303) to enter the inside of the static shaft sleeve (102), the gap between the stirring tool (101) and the static shaft sleeve (102) is 0.1-0.2mm, and the root plane of the stirring head (10103) is lower than the plane of the static shaft sleeve (102) by 0.2-0.3mm.

4. The precision tissue control wire feeding friction stir welding device of claim 3, wherein, The shaft shoulder telescopic groove (10203) is embedded with the slide rail (20101) of the transmission connecting rod mechanism (201), so that the movement of the sliding block (20102) directly drives the shaft shoulder telescopic part (203) to linearly expand and contract in the shaft shoulder telescopic groove (10203). The telescopic shaft shoulder module (2) comprises the transmission connecting rod mechanism (201), the shaft shoulder fixed part (202) and the shaft shoulder telescopic part (203). The shaft shoulder fixed part (202) is provided with a servo motor (20201) and a threaded shaft (20202). The servo motor (20201) drives the threaded shaft (20202) to rotate, thereby controlling the movement of the ball nut (20301) and the telescopic shaft shoulder (20302), and is used for driving the movement of the shaft shoulder telescopic part (203). In the transmission connecting rod mechanism (201), the fixed block (20103) is connected with the upper surface of the shaft shoulder telescopic part (203), and the sliding block (20102) provides support after self-locking to ensure the bearing capacity.

5. The precision tissue control wire feeding friction stir welding device of claim 1, wherein, The fiber winding module (3) comprises a driving mechanism (301), a fiber winding mechanism (302) and a wire body (303). The driving mechanism (301) is composed of a torque motor (30101) and a driving gear (30102) and is used for controlling the fiber tension. The fiber winding mechanism (302) comprises a driven gear (30202), a fiber reel (30201) and a fiber reinforced body (30203). The fiber reel (30201) is fixed on the driven gear (30202).

6. The precision tissue control, pin-welding friction stir welding device of claim 1, wherein, The wire body (303) is made of aluminum, magnesium, titanium or their alloys. The fiber reinforced body (30203) is made of carbon fiber, boron fiber, silicon carbide fiber or alumina fiber. The surface of the fiber reinforced body (30203) is coated with an insulating coating. The device is suitable for friction stir welding in the fields of aerospace, rail transportation, ships and automobiles.

7. A precision controlled wire filling friction stir welding method using the device of any one of claims 1 to 6, characterized in that, The method comprises the following steps: Step one, pretreatment: grinding the surface of the plate and laser texturing the heat affected zone to enhance the bonding strength; Step two, welding start: the spindle rotating part drives the stirring tool (101) to rotate and penetrate into the base plate. The stationary shaft sleeve (102) maintains a gap with the base plate; Step three, wire filling and thickening: when the weld needs to be thickened, the wire body (303) is fed from the wire feeding port (10202). At the same time, the torque motor (30101) of the fiber winding module (3) monitors the fiber tension in real time. The tension value is controlled within the range of 5-15N to ensure uniform winding of the fiber and drive the fiber reinforced body (30203) to uniformly wind onto the surface of the wire. The helical part (10102) of the stirring tool (101) shears the wire and fiber into particles and deposits them on the base plate; Step four, structure regulation: the servo motor (20201) of the telescopic shaft shoulder module (2) adjusts the shaft shoulder size through the threaded shaft (20202) to forge and press the plastic material, realizing the diffusion bonding of the heat affected zone and the filler material; Step five, connection completion: after reaching the preset pressure, the spindle moves to complete the welding.

Images