Flexible ultrasonic-assisted argon tungsten-arc welding working platform

Abstract

The invention relates to a flexible ultrasonic-assisted argon tungsten-arc welding working platform, and belongs to the technical field of welding. The ultrasonic tool system and the welding gun are fixed in the transverse movement system through a clamp, the ultrasonic tool system and the welding gun are positioned and moved in the direction perpendicular to a welding seam through the transverse movement system, a workpiece is fixed to a sliding table of the longitudinal movement system, and the workpiece moves in the welding seam direction through the longitudinal movement system. The longitudinal movement system is fixed in the vertical lifting system, movement of a workpiece in the vertical direction is completed through the vertical lifting system, the ultrasonic tool system is perpendicular to the surface of the workpiece, and ultrasonic vibration is transmitted between a spherical rolling head at the front end and the workpiece in a point-surface contact mode. The device has the advantages of being novel in conception, stable and reliable in equipment, good in balance, resistant to interference, high in assembly precision, space-saving, flexible and convenient to operate, and capable of meeting the requirements for high-quality, high-precision and low-cost ultrasonic-assisted tungsten electrode argon arc welding of workpieces with different weld joint shapes.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and in particular to a flexible ultrasonic-assisted tungsten inert gas arc welding work platform, which is mainly suitable for high-quality welding of metals with poor weldability, joint structure and performance degradation, such as ferritic stainless steel. Background Art

[0002] Ultrasonic assisted welding can significantly improve the quality of welded joints without being limited by material composition, content and welding process, so it has attracted widespread attention. As an external auxiliary energy field, ultrasound can induce acoustic cavitation and acoustic cavitation flow effects in the weld pool, increase the metal nucleation rate, inhibit dendrite growth, and greatly improve the structure and performance of welded joints.

[0003] There are many flexible ways to introduce ultrasound into the welding process, such as through the tungsten electrode or the base material into the molten pool, or directly acting on the molten pool. However, considering the reliability, stability, efficiency and cost of welding, it is the ideal conduction method to introduce ultrasound into the molten pool through the base material.

[0004] When the ultrasonic wave is transmitted into the molten pool through the base material, the sinusoidal vibration of the ultrasonic frequency forms a disturbance force at the excitation point of the base material. As the vibration propagates, a standing wave is formed inside the base material under the excitation of the ultrasonic frequency vibration, which increases the vibration at some positions and weakens the vibration at some positions. Although the ultrasonic energy field applied at different positions can play a role in the solidification of the molten pool, the welding effect of the molten pool at the antinode and the node is obviously different. Therefore, in order to achieve the best effect, the optimal excitation position of the ultrasonic frequency vibration should be determined according to the shape and size of the workpiece, and the molten pool should always be ensured to be at the maximum vibration displacement. This requires that the excitation position of the ultrasonic frequency vibration be adjusted in real time with the molten pool position and welding speed.

[0005] At present, the ultrasonic vibration excitation position of some ultrasonic assisted welding processes is fixed during the welding process. This obviously cannot meet the above requirements. In the welding process where the ultrasonic vibration excitation point moves with the tungsten electrode, most technical solutions are to fix the ultrasonic tool system and the tungsten electrode in a set of fixtures. Although this achieves the synchronous movement of the ultrasonic vibration excitation point with the tungsten electrode, the distance between the two remains unchanged and cannot be adjusted in real time. When welding workpieces with complex weld shapes, it is also impossible to meet the requirement that the molten pool is always at the maximum vibration displacement. In a few technical solutions where the ultrasonic vibration excitation point can be adjusted in real time, the overall rigidity of the equipment is insufficient and the stability is poor, resulting in unstable ultrasonic vibration input and affecting the welding quality. Summary of the invention

[0006] The object of the present invention is to provide a flexible ultrasonic-assisted tungsten inert gas arc welding work platform, which solves the problems commonly existing in the existing ultrasonic-assisted welding technology, such as unstable ultrasonic vibration input, inaccurate position of the excitation point and difficulty in adjusting during the welding process, insufficient rigidity of the overall equipment, low reliability, and unclear weld grain refinement effect. The movement of the heat source during welding can be regarded as the relative movement between the welding gun and the weldment. Therefore, the movement scheme can be divided into two modes: the welding gun is fixed and the welding platform is moved, and the welding platform is fixed and the welding gun is moved. If the welding platform is fixed and the welding gun is moved, the ultrasonic tool system also needs to move accordingly. This mode of moving while vibrating is not conducive to ensuring the stable output of the amplitude and the accurate tracking of the vibration enhancement zone. Therefore, it is more feasible to select a mode of fixing the welding gun and moving the welding platform. The flexible ultrasonic-assisted tungsten inert gas arc welding work platform of the present invention can achieve the above purpose and provide a reference for future ultrasonic-assisted TIG welding systems. The present invention can meet the high-quality and high-efficiency ultrasonic-assisted TIG welding of different workpiece shapes and weld shapes. The overall welding platform has high rigidity and reliability, and can accurately adjust parameters according to needs to ensure accurate positioning and real-time movement of ultrasonic vibration excitation points, thereby improving welding efficiency while ensuring welding quality. The flexible ultrasonic assisted tungsten inert gas arc welding work platform of the present invention has a compact structure, high assembly accuracy, good balance, strong anti-interference ability, and flexible and convenient operation.

[0007] The above-mentioned object of the present invention is achieved by the following technical solutions: Flexible ultrasonic assisted tungsten inert gas welding work platform, the ultrasonic tool system 14 is installed on the transverse precision ball screw B17 through the ultrasonic tool system fixture 18, and the welding gun 20 is installed on the transverse precision ball screw A19 through the welding gun fixture 6; the slide 4 is carried on the slider 15 of the longitudinal screw nut mechanism 12 and the dovetail sliding guide rails 16 on both sides; the longitudinal working platform 21 supporting the longitudinal screw nut mechanism 12 and the dovetail sliding guide rail 16 is installed on the screw lifting mechanism 2; the transverse motion system composed of the transverse drive motor A5, the transverse drive motor B13, the transverse precision ball screw A19, and the transverse precision ball screw B17 completes the vertical movement of the ultrasonic tool system 14 and the welding gun 20 Movement perpendicular to the weld direction; the longitudinal motion system composed of the longitudinal drive motor 1, the longitudinal screw nut mechanism 12, the dovetail sliding guide 16, the slider 15, and the slide 4 completes the movement of the workpiece along the weld direction; the vertical lifting system composed of the screw lifting mechanism 2, the flange coupling A3, the flange coupling B7, the flange coupling C9, the bevel gear commutator 8, the worm reducer 10, and the vertical drive motor 11 completes the movement of the workpiece in the vertical direction; through the linkage of the lateral motion system, the longitudinal motion system, and the vertical lifting system, the stable input of ultrasonic vibration at the optimal position, the real-time adjustment of the excitation point position with the welding position and welding speed, and the smooth operation of TIG welding are achieved.

[0008] The ultrasonic tool system 14 is perpendicular to the workpiece surface, and the rolling head at the front end contacts the workpiece surface to transmit ultrasonic vibrations; before welding, the contact point between the rolling head and the workpiece and the starting point of the weld are synchronized in the direction along the weld and at a preset distance; during welding, the position of the excitation point in the direction perpendicular to the weld is adjusted by the lateral motion system so that it always maintains a preset distance from the molten pool; ultrasonic waves produce acoustic cavitation and acoustic flow effects in the molten pool, increase the nucleation undercooling of the molten pool metal and break up columnar crystals, thereby refining the weld grains and inhibiting the formation of columnar crystals.

[0009] The dovetail sliding guide rails 16 are symmetrically distributed on both sides of the longitudinal screw nut mechanism 12, and the gaps in the horizontal and vertical directions are controlled by the gap adjustment device; driven by the longitudinal drive motor 1, the slide 4 fixed on the longitudinal screw nut mechanism 12 and the slider 15 moves linearly along the direction of the weld.

[0010] There are four screw lifting mechanisms 2, which are symmetrically arranged at the four corner points of the working platform, and evenly bear the load generated when the working platform is in operation to ensure the stability of welding; the motion is transmitted through the flange coupling A3, the flange coupling B7, the flange coupling C9 and the bevel gear commutator 8, so that the four screw lifting mechanisms 2 can operate synchronously and controllably under the drive of the same vertical drive motor 11.

[0011] The screw lifting mechanism 2 realizes movement in a direction perpendicular to the slide 4 through a worm gear; the center hole of the turbine is processed with an internal thread, which forms a spiral pair with the screw, so that the screw can be vertically lifted and lowered as the turbine rotates; the longitudinal working platform 21 is fixed on the nut on the upper part of the screw.

[0012] The two screw lifting mechanisms 2 located on one side of the weld are connected to each other through two flange couplings A3, and the two screw lifting mechanisms 2 close to the vertical drive motor are respectively connected to the bevel gear commutator 8 through the flange coupling B7. The bevel gear commutator 8 completes the conversion of the movement direction and is connected to the worm reducer 10 through the flange coupling connection C9; the two bevel gear commutators 8 are symmetrically distributed relative to the worm reducer 10, and the worm reducer 10 is connected to the vertical drive motor 11.

[0013] The ultrasonic tool system 14 is fixed on the ultrasonic tool system fixture 18 through the clamping block on the shell; the welding gun fixture 6 is marked with scales to meet the precise positioning of the welding gun angle.

[0014] The beneficial effects of the present invention are as follows: the ultrasonic tool system does not need to move along the direction of the weld, but only moves in a direction perpendicular to the weld when the shape of the weld changes, so as to maintain the optimal distance from the molten pool. The spherical rolling head at the front end of the ultrasonic tool system can rotate freely around the center of the sphere, directly contact the surface of the workpiece to be welded under a certain static pressure, and stably and continuously transmit the ultrasonic frequency impact to the workpiece moving along the direction of the weld by rolling. Stable and continuous acoustic cavitation and acoustic flow effects can efficiently increase the nucleation supercooling of the molten pool during the solidification process, making the dendrites more completely broken, and the weld grain refinement range larger and the size more uniform. The equipment has a compact structure, high rigidity, high assembly precision, and stable operation. It can meet the ultrasonic-assisted TIG welding of different workpiece shapes and weld shapes, and the position of the ultrasonic excitation point is accurately controllable, which can achieve high-quality, high-precision, high-efficiency, and low-cost welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The illustrative examples of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] Figure 1 It is a schematic diagram of the structure of the flexible ultrasonic assisted tungsten inert gas arc welding work platform of the present invention; Figure 2 It is a side view schematic diagram of the present invention; Figure 3 This is the metallographic structure of the ferritic stainless steel TIG welded joint; Figure 4 The present invention discloses the metallographic structure of a flexible ultrasonic assisted tungsten inert gas arc welding ferrite stainless steel joint.

[0017] In the figure: 1. longitudinal drive motor; 2. screw lifting mechanism; 3. flange coupling; 4. slide; 5. transverse drive motor A; 6. welding gun fixture; 7. flange coupling; 8. bevel gear commutator; 9. flange coupling; 10. worm reducer; 11. vertical drive motor; 12. longitudinal screw nut mechanism; 13. transverse drive motor B; 14. ultrasonic tool system; 15. slider; 16. dovetail sliding guide; 17. transverse precision ball screw B; 18. ultrasonic tool system fixture; 19. transverse precision ball screw A; 20. welding gun; 21. longitudinal working platform. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] See also Figures 1 to 4 As shown, the flexible ultrasonic-assisted tungsten inert gas arc welding work platform of the present invention can solve the problems of unstable and discontinuous ultrasonic energy field input and inaccurate ultrasonic excitation point position in ordinary ultrasonic-assisted welding, which in turn cause the acoustic cavitation and acoustic flow effect in the welding molten pool to be unstable, discontinuous, and insignificant, resulting in incomplete dendrite fragmentation, reduced weld grain refinement range, insufficient grain size reduction, and other problems. It includes an ultrasonic tool system, a welding gun, an ultrasonic tool system fixture, a welding gun fixture, a transverse motion system, a longitudinal motion system, and a vertical lifting system. The ultrasonic tool system and the welding gun are fixed in the transverse motion system by a fixture. The transverse motion system is used to position and move the ultrasonic tool system and the welding gun in a direction perpendicular to the weld. The workpiece is fixed on the slide of the longitudinal motion system. The longitudinal motion system is used to move the workpiece in the direction of the weld. The longitudinal motion system is fixed in the vertical lifting system. The vertical lifting system is used to move the workpiece in the vertical direction. The ultrasonic tool system is perpendicular to the surface of the workpiece, and the spherical rolling head at the front end transmits ultrasonic vibration to the workpiece in a point-to-surface contact manner. Through the coordination of the lateral motion system, longitudinal motion system, and vertical lifting system, the stable input of ultrasonic vibration and the real-time adjustment of the excitation point position with the welding position and welding speed, as well as the smooth welding are achieved, so that flexible ultrasonic-assisted tungsten inert gas arc welding can be achieved after turning on the ultrasonic power supply, shielding gas, and welding machine power supply. The design is novel, the equipment is stable and reliable, has good balance, anti-interference, high assembly precision, saves space, and is flexible and convenient to operate. It can meet the high-quality, high-precision, and low-cost ultrasonic-assisted tungsten inert gas arc welding of workpieces with different weld shapes.

[0020] The present invention fixes the ultrasonic tool system and the welding gun on the transverse motion system, fixes the workpiece on the slide of the longitudinal motion system, and then assembles the longitudinal motion system on the vertical lifting system. Before welding, the workpiece is clamped on the slide; the driving motors of each motion system are set, and the positions of the ultrasonic tool system and the welding gun are adjusted through the transverse motion system according to the preset distance between the starting point of the weld, the ultrasonic excitation point and the molten pool; the position of the workpiece is adjusted through the longitudinal motion system and the vertical lifting system, so that the starting point of the weld is aligned with the tungsten tip of the welding gun up and down, and a suitable arc striking distance is maintained in the vertical direction, and at the same time, the rolling head at the front end of the ultrasonic tool system directly contacts the surface of the workpiece base material under a certain pressure. Then, turn on the ultrasonic power supply, the shielding gas, and the TIG welding power supply, and achieve high-quality and high-efficiency flexible ultrasonic-assisted tungsten argon arc welding through the cooperation of the transverse motion system, the longitudinal motion system and the vertical lifting system.

[0021] See also Figure 1 and Figure 2 As shown, the flexible ultrasonic-assisted tungsten inert gas welding work platform of the present invention comprises an ultrasonic tool system 14, an ultrasonic tool system fixture 18, a welding gun 20, a welding gun fixture 6, a transverse precision ball screw A19, a transverse precision ball screw B17, a transverse drive motor A5, a transverse drive motor B13, a slide 4, a longitudinal screw nut mechanism 12, a dovetail sliding guide 16, a slider 15, a longitudinal work platform 21, a longitudinal drive motor 1, a screw lifting mechanism 2, a flange coupling A3, a flange coupling B7, a flange coupling C9, a bevel gear commutator 8, a worm reducer 10, and a vertical drive motor 11. The ultrasonic tool system 14 is fixed on the transverse precision ball screw B17 through the ultrasonic tool system fixture 18, the welding gun 20 is fixed on the transverse precision ball screw A19 through the welding gun fixture 6, the slide 4 is fixed on the slider 15 of the screw nut mechanism 12 and the dovetail sliding guide rails 16 on both sides; the screw nut mechanism 12 and the dovetail sliding guide rails 16 on both sides are fixed on the longitudinal working platform 21, and the longitudinal working platform 21 is fixed on the screw nut of the screw lifting mechanism 2. Through the cooperation of the transverse precision ball screw B17, the screw nut mechanism 12 and the screw lifting mechanism 2, the real-time movement of the ultrasonic vibration input position is realized as the weld shape, welding speed and vibration field distribution change.

[0022] The ultrasonic tool system 14 is perpendicular to the workpiece surface, and the spherical rolling head at the front end contacts the workpiece surface (point-surface contact mode) to transmit ultrasonic vibration. The outer shell of the ultrasonic tool system 14 is composed of an inner sleeve and an outer sleeve. A standard compression spring is arranged in the outer sleeve to press between the rear end of the inner sleeve and the rear cover of the ultrasonic tool system. When the ultrasonic tool system 14 is pressed vertically against the workpiece surface, the relative displacement between the inner and outer sleeves is determined according to the scale on the outer shell, thereby determining the static pressure applied.

[0023] Before welding, the angle between the welding gun 20 and the workpiece is adjusted by the welding gun fixture 6; then the horizontal precision ball screw B17 is driven by the horizontal drive motor B13 to synchronize the contact point between the rolling head and the workpiece and the starting point of the weld in the direction of the weld and at a preset distance; then the vertical distance between the lowest point of the rolling head and the tip of the tungsten electrode is calibrated in combination with the surface shape of the workpiece and the preset static pressure. During welding, the position of the welding gun and the ultrasonic vibration excitation point in the direction perpendicular to the weld is adjusted by the horizontal motion system so that it is always kept at a preset distance from the molten pool and matches the shape of the weld.

[0024] The movement of the workpiece along the weld direction is completed by the longitudinal motion system. The lead screw nut mechanism 12 is fixed on the longitudinal working platform 21 in the center along the weld direction, and dovetail sliding guides 16 are symmetrically arranged on both sides. The nut matched with the lead screw and the sliders 15 on the dovetail sliding guides 16 on both sides carry the slide 4 together. The longitudinal drive motor 1 drives the lead screw to rotate, and then drives the ball screw nut pair to make linear motion. The motor parameters are set according to the welding speed so that the workpiece moves along the weld direction according to the process requirements.

[0025] The vertical movement of the workpiece is completed by the vertical lifting system. The longitudinal working platform 21 is fixed on the screw nut of the screw lifting mechanism 2. The screw and the turbine with internal threads in the center hole form a spiral pair. The rotation of the turbine drives the longitudinal working platform 21 to move up and down. In order to make the longitudinal working platform 21 rise and fall smoothly and accurately, the screw lifting mechanism 2 is symmetrically arranged at the four corners of the working platform to evenly bear the load generated when the working platform is running. In order to make the four screw lifting mechanisms 2 run synchronously and controllably, two flange couplings 3 are used to connect the two screw lifting mechanisms 2 on one side of the weld. The screw lifting mechanism 2 close to the motor side is connected to the bevel gear commutator 8 by a flange coupling 7. The bevel gear commutator 8 completes the conversion of the motion direction and is connected to the worm reducer 10 through a flange coupling 9. The two bevel gear commutators 8 are symmetrically distributed about the worm reducer 10. The worm reducer 10 is connected to the vertical drive motor 11.

[0026] In the above technical scheme, the ultrasonic vibration field distribution is simulated and calculated according to parameters such as the workpiece weld shape and welding speed, and the position of the ultrasonic excitation point is determined so that the molten pool is always in the area of ​​maximum amplitude, thereby obtaining the best acoustic cavitation and acoustic flow effects on the flexible ultrasonic-assisted tungsten inert gas welding work platform, maximizing the weld metal nucleation rate, refining the weld grains, and inhibiting the formation of columnar crystals. Example

[0027] The flexible ultrasonic assisted tungsten inert gas arc welding work platform of the present invention comprises an ultrasonic vibration system, a welding gun clamping system, a transverse motion system, a longitudinal motion system, and a vertical lifting system. The ultrasonic tool system in the ultrasonic vibration system is mounted on the precision ball screw of the transverse motion system and moves in a direction perpendicular to the weld so that the input position of the ultrasonic vibration is at the optimal excitation point. The welding gun is clamped on the precision ball screw on the transverse motion system at an angle required by the process and moves in a direction perpendicular to the weld so that the tip of the tungsten electrode is aligned with the center of the weld. The workpiece is fixed on the welding slide. The welding slide moves along the direction of the weld under the drive of the screw nut mechanism and the dovetail sliding guide rail. The screw nut mechanism and the dovetail sliding guide rail are fixed on the longitudinal workbench. The longitudinal workbench moves in the vertical direction through the screw lifting mechanism. Through the linkage of the transverse motion system, the longitudinal motion system, and the vertical lifting system, the stable input of ultrasonic vibration, the real-time adjustment of the excitation position with the welding position and the welding speed, and the smooth operation of TIG welding are realized. The spherical working head at the front end of the ultrasonic tool system transmits ultrasonic vibration to the molten pool in a point-to-surface contact with the workpiece, inducing ultrasonic cavitation effect in the molten pool, increasing the nucleation rate, refining the grains, and inhibiting the formation of columnar crystal areas in the weld. Figure 3 As shown, it can meet the requirements of high quality, high precision and low cost welding for different workpiece shapes and weld shapes.

[0028] When in use, two steel plates pre-treated before welding are clamped to the welding slide of the present invention respectively, the ultrasonic tool system is clamped to the fixture of the transverse precision ball screw A, and the welding gun is clamped to the welding gun clamping system of the transverse precision ball screw B. Adjust the welding gun clamping system so that the tip of the tungsten pole of the welding gun is aligned with the symmetrical surface of the two workpieces. Adjust the position of the ultrasonic tool system so that the lowest point of the rolling head is located at the calculated optimal position. Adjust the height of the ultrasonic tool system again according to the position of the tip of the tungsten pole of the welding gun and the preset static pressure value. Use the longitudinal drive motor to drive the screw nut mechanism, adjust the position of the welding slide, and align the tip of the tungsten pole of the welding gun with the starting point of the weld. The motion is transmitted to the screw lifting mechanism through the worm reducer, the bevel gear commutator, and the flange coupling, thereby driving the longitudinal workbench to complete the lifting motion, so that the starting point of the weld on the upper surface of the workpiece is 2mm away from the tip of the tungsten pole of the welding gun, and at the same time, the rolling head of the ultrasonic tool system is steadily pressed on the surface of the base material. Turn on the ultrasonic power supply, shielding gas, and TIG welding machine power supply, set the motor parameters according to the workpiece shape, weld shape, welding speed, and the optimal input position of ultrasonic vibration, and start the motor at the same time to complete the welding. After the welding is completed, control the vertical drive motor to lower the longitudinal working platform, and keep the shielding gas on until the workpiece cools to room temperature. In the ferritic stainless steel flexible ultrasonic-assisted TIG welding joint obtained in this example, the coarse columnar crystals at the weld are significantly refined, and the range of the fine grain zone is also significantly increased.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made to the present invention shall be included in the protection scope of the present invention.

Claims

1. A flexible ultrasonic assisted tungsten inert gas welding work platform, characterized in that: The ultrasonic tool system (14) is mounted on the transverse precision ball screw B (17) through the ultrasonic tool system fixture (18), and the welding gun (20) is mounted on the transverse precision ball screw A (19) through the welding gun fixture (6); the slide table (4) is mounted on the slider (15) of the longitudinal screw nut mechanism (12) and the dovetail sliding guide rails (16) on both sides; the longitudinal working platform (21) supporting the longitudinal screw nut mechanism (12) and the dovetail sliding guide rail (16) is mounted on the screw lifting mechanism (2); the transverse motion system composed of the transverse drive motor A (5), the transverse drive motor B (13), the transverse precision ball screw A (19), and the transverse precision ball screw B (17) completes the vertical movement of the ultrasonic tool system (14) and the welding gun (20). The invention relates to a method for realizing a vertical movement of the workpiece in a direction perpendicular to the weld seam; a longitudinal motion system composed of a longitudinal drive motor (1), a longitudinal lead screw nut mechanism (12), a dovetail sliding guide rail (16), a slider (15), and a slide table (4) completes the movement of the workpiece along the weld seam direction; a vertical lifting system composed of a lead screw lifting mechanism (2), a flange coupling A (3), a flange coupling B (7), a flange coupling C (9), a bevel gear commutator (8), a worm reducer (10), and a vertical drive motor (11) completes the movement of the workpiece in the vertical direction; and through the linkage of the lateral motion system, the longitudinal motion system, and the vertical lifting system, the stable input of ultrasonic vibration at the optimal position, the real-time adjustment of the excitation point position according to the welding position and the welding speed, and the smooth operation of TIG welding are achieved.

2. The flexible ultrasonic assisted tungsten inert gas welding work platform according to claim 1 is characterized in that: The ultrasonic tool system (14) is perpendicular to the workpiece surface, and the rolling head at the front end contacts the workpiece surface to transmit ultrasonic vibration; Before welding, the contact point between the rolling head and the workpiece and the starting point of the weld are synchronized in the direction of the weld and at a preset distance; during welding, the position of the excitation point in the direction perpendicular to the weld is adjusted by the lateral motion system so that it always maintains a preset distance from the molten pool; ultrasonic waves produce acoustic cavitation and acoustic flow effects in the molten pool, increasing the nucleation undercooling of the molten pool metal and breaking up columnar crystals, thereby refining the weld grains and inhibiting the formation of columnar crystals.

3. The flexible ultrasonic assisted tungsten inert gas welding work platform according to claim 1 is characterized in that: The dovetail sliding guide rails (16) are symmetrically distributed on both sides of the longitudinal screw nut mechanism (12), and the gaps in the horizontal and vertical directions are controlled by the gap adjustment device; driven by the longitudinal drive motor (1), the slide table (4) fixed on the longitudinal screw nut mechanism (12) and the slide block (15) moves linearly along the direction of the weld.

4. The flexible ultrasonic assisted tungsten inert gas welding work platform according to claim 1, characterized in that: There are four screw lifting mechanisms (2) symmetrically arranged at four corner points of the working platform, evenly bearing the load generated when the working platform is in operation and ensuring the stability of welding; the four screw lifting mechanisms (2) are driven by the same vertical drive motor (11) to synchronize and controllably operate by cooperating and transmitting motion through the flange coupling A (3), the flange coupling B (7), the flange coupling C (9) and the bevel gear commutator (8).

5. The flexible ultrasonic assisted tungsten inert gas welding work platform according to claim 1 or 4, characterized in that: The screw lifting mechanism (2) is moved in a direction perpendicular to the slide (4) by means of a worm gear; the center hole of the turbine is processed with an internal thread, which forms a spiral pair with the screw, so that the screw rotates with the turbine to achieve vertical lifting; the longitudinal working platform (21) is fixed on a nut on the upper part of the screw.

6. The flexible ultrasonic assisted tungsten inert gas welding work platform according to claim 1 or 4, characterized in that: The two screw lifting mechanisms (2) located on one side of the weld are connected to each other through two flange couplings A (3), and the two screw lifting mechanisms (2) close to the vertical drive motor are respectively connected to the bevel gear commutator (8) through flange couplings B (7). The bevel gear commutator (8) completes the conversion of the movement direction and is connected to the worm reducer (10) through the flange coupling connection C (9); the two bevel gear commutators (8) are symmetrically distributed relative to the worm reducer (10), and the worm reducer (10) is connected to the vertical drive motor (11).

7. The flexible ultrasonic assisted tungsten inert gas welding work platform according to claim 1, characterized in that: The ultrasonic tool system (14) is fixed on the ultrasonic tool system fixture (18) via a clamping block on the housing; the welding gun fixture (6) is marked with scale.

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