Super-audio TIG (tungsten inert gas) double-tungsten-electrode rotary welding gun for electric arc additive manufacturing

Abstract

The superaudio-frequency TIG double-tungsten-electrode rotary welding gun for electric arc additive manufacturing comprises a double-tungsten-electrode rotary welding gun body, and a composite superaudio-frequency pulse TIG welding power source A and a composite superaudio-frequency pulse TIG welding power source B are arranged on the two sides of the double-tungsten-electrode rotary welding gun body correspondingly. The composite superaudio frequency pulse TIG welding power source A and the composite superaudio frequency pulse TIG welding power source B are electrically connected with the double-tungsten-electrode rotary welding gun, and the double-tungsten-electrode rotary welding gun comprises a motor integrated module, a tungsten electrode module A, a tungsten electrode module B, a wire guide nozzle, a wire guide pipe, a wire guide pipe fixing block, a welding main power source quick plug and a DD motor quick plug. A rotor of the DD motor integrated module is fixedly connected with a fixing block, the tungsten electrode module A and the tungsten electrode module B are fixed with the rotor of the DD motor integrated module through the fixing block, the motor integrated module is electrically connected with the DD motor fast plug, and the device solves the problem of poor practicability at present.

Description

Technical Field

[0001] The present invention belongs to the technical field of arc additive manufacturing, and particularly relates to an ultra-audio-frequency TIG double-tungsten-electrode rotating welding torch for arc additive manufacturing. Background Art

[0002] TIG arc additive manufacturing is a technology that uses tungsten inert gas shielded welding as a heat source to stack materials layer by layer. In this technology, the high-energy arc generated by the tungsten electrode serves as the heat source to melt and deposit the metal wire or powder layer by layer onto the substrate, and this process is carried out in a controlled protective atmosphere to avoid oxidation of the material. TIG arc additive manufacturing has characteristics such as low energy input, low spatter, and high stability of the microstructure morphology, and is widely used.

[0003] Currently, the TIG arc additive manufacturing welding torch selects side-axis wire feeding, and different wire feeding conditions are changed according to the moving direction of the welding torch during the additive manufacturing process, including forward feeding, backward feeding, and side feeding. In simple one-way deposition TIG welding, many studies have adopted the condition of wire feeding from the front of the traveling direction. Under the side wire feeding condition, the alignment position of the welding wire will shift, which causes the deposition position of the weld seam to deviate from the center position of the welding torch. This direction dependence of the deposition process makes it difficult to achieve uniform and stable complex shapes in TIG welding.

[0004] According to the search, Gao Ming et al. disclosed an arc additive manufacturing device and method with adjustable wire feeding direction in a Chinese invention patent with the invention name "An Arc Additive Manufacturing Device and Method with Adjustable Wire Feeding Direction" and the publication number CN108971806B, which effectively solved the problem of inconsistent deposition direction and filling material direction in additive manufacturing with side-axis wire feeding when forming parts with non-linear contours. However, there are still problems such as the need for an additional rotating shaft and a controlled welding torch, complex path generation, low flexibility, insufficient arc wrapping of the welding wire, low stability of droplet transfer, and inability to be applied to the efficient additive manufacturing of complex large components, and the practicability is poor. This phenomenon has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide an ultra-audio-frequency TIG double-tungsten-electrode rotating welding torch for arc additive manufacturing to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: A super audio frequency TIG double tungsten electrode rotating welding torch for arc additive manufacturing, including a double tungsten electrode rotating welding torch. On both sides of the double tungsten electrode rotating welding torch, a composite super audio frequency pulse TIG welding power source A and a composite super audio frequency pulse TIG welding power source B are respectively arranged. The composite super audio frequency pulse TIG welding power source A and the composite super audio frequency pulse TIG welding power source B are electrically connected to the double tungsten electrode rotating welding torch. The super audio frequency pulse modules of the composite super audio frequency pulse TIG welding power source A and the composite super audio frequency pulse TIG welding power source B add high-frequency current to the additive process, achieving the effect of a stable arc, refining the additive structure, and improving the performance of the component.

[0007] The present invention further explains that the double tungsten electrode rotating welding torch includes a motor integrated module, a tungsten electrode module A, a tungsten electrode module B, a wire guide nozzle, a wire guide tube, a wire guide tube fixing block, a welding main power quick connector, and a DD motor quick connector. A fixing block is fixedly connected to the rotor of the DD motor integrated module. The tungsten electrode module A and the tungsten electrode module B are fixed to the rotor of the DD motor integrated module through the fixing block. The motor integrated module is electrically connected to the DD motor quick connector. The welding main power quick connector is connected to an external welding power source through a welding cable. The tungsten electrode module A and the tungsten electrode module B rotate rapidly under the action of the DD motor integrated module, forming an annular heat source, providing a greater heat input, which can improve the deposition efficiency, improve the production efficiency, and can achieve the high-efficiency additive manufacturing of complex large components.

[0008] The present invention further explains that the wire guide tube is fixed to the wire guide tube fixing block, and the wire guide tube is fixed at the central axis of the double tungsten electrode rotating welding torch by the wire guide tube fixing block.

[0009] The present invention further explains that both the tungsten electrode module A and the tungsten electrode module B include a tungsten needle, a tungsten needle fixing block, a water cooling tube, a gas supply tube, and a conductive block. The conductive block is fixed to the fixing block. The tungsten needle fixing block is fixedly connected to the conductive block. The tungsten needle is fixedly installed on one side of the tungsten needle fixing block. The rotation speed of the DD motor integrated module and the rotation speeds of the tungsten electrode module A and the tungsten electrode module B fixed to the rotor through the fixing block can be adjusted in real time according to requirements. The tilt angle can be adjusted as needed; the water cooling path composed of the water cooling tubes realizes the cooling of the tungsten needle.

[0010] The present invention further explains that the tungsten needle inclines towards the central axis of the double tungsten electrode rotating welding torch through the tungsten needle fixing block, and the fixing block realizes the fixation of the tungsten electrode module A, the tungsten electrode module B, and the rotor of the DD motor integrated module. The coaxial feeding of the welding wire and the central axis of the welding torch is realized, avoiding the problem of the dependence of non-consumable electrode side-axis wire feeding arc additive manufacturing on the wire feeding direction.

[0011] The present invention is further described as follows. The tungsten needle fixing block is of a hollow structure. One end of the air supply pipe extends into the interior of the tungsten needle fixing block. One end of the air supply pipe is connected through a communication pipe. A wrapping shell is installed at the bottom of the tungsten needle fixing block. The wrapping shell is connected through to the communication pipe. There is a gap between the inner wall of the wrapping shell and the outer wall of the tungsten needle.

[0012] The present invention is further described as follows. A cooling shell is arranged inside the tungsten needle fixing block. The cooling shell wraps around the outer wall of the tungsten needle. A communication shell is correspondingly installed on the outer wall of the cooling shell. One end of the water cooling pipe extends into the interior of the tungsten needle fixing block, and one end of the water cooling pipe is connected through to the communication shell. A water pump is installed on the water cooling pipe.

[0013] The present invention is further described as follows. A folding bladder is installed on the outer wall of the tungsten needle fixing block. The two ends of the folding bladder are respectively connected through to the water cooling pipe and the communication shell. An electric telescopic rod is installed on the outer wall of the tungsten needle fixing block. The output end of the electric telescopic rod is connected to a connecting block, and the connecting block is fixed to the folding bladder.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention can avoid the problem of dependence on the wire feeding direction in non-consumable side-axis wire feeding arc additive manufacturing, achieve all-round additive manufacturing, and the tungsten electrode module can adjust the tilt angle of the tungsten electrode as needed, thus eliminating the need for an additional rotating shaft and controlling the welding torch. Description of the Drawings

[0015] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure of the double-tungsten-electrode rotating welding torch of the present invention; Figure 3 is a structural diagram of the tungsten electrode module of the present invention; Figure 4 is a schematic diagram of the water cooling principle of the present invention; In the figure: 1. Dual-tungsten-electrode rotating welding torch; 2. Composite ultra-audio-frequency pulse TIG welding power source A; 3. Composite ultra-audio-frequency pulse TIG welding power source B; 4. DD motor integrated module; 5. Tungsten electrode module A; 6. Tungsten electrode module B; 7. Wire guide nozzle; 8. Wire guide tube; 9. Wire fixing block; 10. Quick plug for the main welding power source; 11. Quick plug for the motor; 12. Tungsten needle; 13. Tungsten needle fixing block; 14. Water cooling pipe; 15. Gas supply pipe; 16. Conductive block; 17. Fixing block; 151. Connecting pipe; 152. Wrapping shell; 141. Water pump; 142. Folding bladder; 143. Connecting block; 144. Electric telescopic rod; 145. Cooling housing; 146. Connecting housing. Detailed implementation manners

[0016] The technical solution of the present invention will be further described in detail and non-limitingly below in conjunction with the preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figures 1-4 , the present invention provides a technical solution: an ultra-audio-frequency TIG dual-tungsten-electrode rotating welding torch for arc additive manufacturing, including a dual-tungsten-electrode rotating welding torch 1. On both sides of the dual-tungsten-electrode rotating welding torch 1, there are respectively arranged a composite ultra-audio-frequency pulse TIG welding power source A 2 and a composite ultra-audio-frequency pulse TIG welding power source B 3. The composite ultra-audio-frequency pulse TIG welding power source A 2 and the composite ultra-audio-frequency pulse TIG welding power source B 3 are electrically connected to the dual-tungsten-electrode rotating welding torch 1. During the additive manufacturing process, the composite ultra-audio-frequency pulse TIG welding power source A 2 and the composite ultra-audio-frequency pulse TIG welding power source B 3 provide stable welding current and welding voltage. At the same time, the ultra-audio-frequency pulse module of the composite ultra-audio-frequency pulse TIG welding power source A 2 and the composite ultra-audio-frequency pulse TIG welding power source B 3 adds high-frequency current to the additive manufacturing process, achieving the effect of stable arc, refining the additive structure, and improving the performance of the component; The double-tungsten-electrode rotary welding torch 1 includes a motor-integrated module 4, a tungsten electrode module A 5, a tungsten electrode module B 6, a wire guide nozzle 7, a wire guide tube 8, a wire guide tube fixing block 9, a welding main power quick connector 10, and a DD motor quick connector 11. A fixing block 17 is fixedly connected to the rotor of the DD motor-integrated module 4. The tungsten electrode module A 5 and the tungsten electrode module B 6 are fixed to the rotor of the DD motor-integrated module 4 through the fixing block 17. The motor-integrated module 4 is electrically connected to the DD motor quick connector 11. The welding main power quick connector 10 is connected to an external welding power source through a welding cable. The tungsten electrode module A 5 and the tungsten electrode module B 6 rotate rapidly under the action of the DD motor-integrated module 4 to form an annular heat source, providing a greater heat input. The rotation speeds of the tungsten electrode module A 5 and the tungsten electrode module B 6 are controlled by the DD motor-integrated module 4. The DD motor-integrated module 4 obtains power to rotate through the DD motor quick connector 11, and the rotation speed of the DD motor-integrated module 4 can be adjusted in real time according to requirements. The welding main power quick connector 10 transfers the welding energy to the tungsten electrode module A 5 and the tungsten electrode module B 6, and then to the welding workpiece; The wire guide tube 8 is fixed to the wire guide tube fixing block 9. The wire guide tube 8 is fixed at the central axis of the double-tungsten-electrode rotary welding torch 1 by the wire guide tube fixing block 9. The welding wire is fed to the wire guide nozzle 7 through the wire guide tube 8. The length of the welding wire sent out by the wire guide nozzle 7 can be adjusted according to actual needs, realizing the coaxial feeding of the welding wire and the central axis of the welding torch, and avoiding the problem of the dependence of non-consumable electrode side-axis wire feeding arc additive manufacturing on the wire feeding direction.

[0018] Both the tungsten electrode module A 5 and the tungsten electrode module B 6 include a tungsten needle 12, a tungsten needle fixing block 13, a water-cooling tube 14, a gas supply tube 15, and a conductive block 16. The conductive block 16 is fixed to the fixing block 17. The tungsten needle fixing block 13 is fixedly connected to the conductive block 16. The tungsten needle 12 is fixedly installed on one side of the tungsten needle fixing block 13. Cooling water is introduced into the water-cooling tube 14, and the formed water-cooling path can realize the cooling of the tungsten needle 12; protective gas is sent into the gas supply tube 15 to meet the atmosphere requirements during the additive manufacturing process; the conductive block 16 transmits the power provided by the welding main power quick connector 10 to the tungsten needle 12, and then to the welding workpiece; The tungsten needle 12 inclines towards the central axis of the double-tungsten-electrode rotary welding torch 1 through the tungsten needle fixing block 13, and the inclination angle of the tungsten needle 12 can be adjusted according to needs. The fixing block 17 realizes the fixation of the tungsten electrode module A 5, the tungsten electrode module B 6, and the rotor of the DD motor-integrated module 4; The tungsten needle fixing block 13 has a hollow structure. One end of the gas supply pipe 15 extends into the interior of the tungsten needle fixing block 13. One end of the gas supply pipe 15 is connected with a communicating pipe 151 in a penetrating manner. A wrapping shell 152 is installed at the bottom of the tungsten needle fixing block 13. The wrapping shell 152 is connected with the communicating pipe 151 in a penetrating manner. There is a gap between the inner wall of the wrapping shell 152 and the outer wall of the tungsten needle 12. The protective gas sent through the gas supply pipe 15 will enter the communicating pipe 151 and then enter the wrapping shell 152, and then be discharged from the gap between the wrapping shell 152 and the tungsten needle 12, realizing gas protection for the tungsten needle 12. Since it is discharged adjacent to the outer wall of the tungsten needle 12 when discharging, the gas utilization rate is high; A cooling housing 145 is arranged inside the tungsten needle fixing block 13. The cooling housing 145 wraps the outer wall of the tungsten needle 12. A communicating housing 146 is correspondingly installed on the outer wall of the cooling housing 145. One end of the water cooling pipe 14 extends into the interior of the tungsten needle fixing block 13, and one end of the water cooling pipe 14 is connected with the communicating housing 146 in a penetrating manner. A water pump 141 is installed on the water cooling pipe 14. By starting the water pump 141 on one side, the water is pumped into the communicating housing 146, and then the water enters the interior of the cooling housing 145 to cool the tungsten needle 12. After cooling, the water pump 141 at the other end is started and the water is pumped out, realizing the circulation of the coolant; A folding bladder 142 is installed on the outer wall of the tungsten needle fixing block 13. The two ends of the folding bladder 142 are respectively connected with the water cooling pipe 14 and the communicating housing 146 in a penetrating manner. An electric telescopic rod 144 is installed on the outer wall of the tungsten needle fixing block 13. The output end of the electric telescopic rod 144 is connected with a connecting block 143. The connecting block 143 is fixed to the folding bladder 142. In order to avoid the problem of continuous pumping of cooling water but insufficient cooling, when the water pump 141 at one end pumps the water into the interior of the cooling housing 145, the two electric telescopic rods 144 are alternately started, so that when one electric telescopic rod 144 stretches, the other compresses, and vice versa, so as to pump the cooling water back and forth between the two, ensuring sufficient contact and cooling of the cooling water with the tungsten needle 12. Finally, the other water pump 141 is started to pump the water away, which can improve the cooling utilization rate of the cooling water.

[0019] The proposed super-audio TIG double-tungsten-pole rotating welding torch for arc additive manufacturing can avoid the problem of the dependence of non-melting electrode side-axis wire feeding arc additive on the wire feeding direction and achieve all-round additive manufacturing. It can avoid the problems of the existing arc additive device with adjustable feeding direction, which requires an additional rotating shaft and a controlled welding torch, with complex path generation and low flexibility. The tungsten electrode module can adjust the tilt angle of the tungsten electrode according to needs, with the advantage of high precision, and can be used to manufacture large components with multiple layers and complex shapes. By symmetrically placing the double tungsten poles, the arc can wrap the welding wire more, increase the heat input, and improve the production efficiency. By introducing the super-audio pulse current, the dynamic behavior of the arc and the stability of droplet transfer can be improved, and the additive structure can be refined.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0021] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultrasonic TIG double tungsten electrode rotary welding gun for arc additive manufacturing, comprising a double tungsten electrode rotary welding gun (1), characterized in that: A composite ultrasonic pulse TIG welding power source A (2) and a composite ultrasonic pulse TIG welding power source B (3) are respectively arranged on both sides of the double tungsten pole rotary welding gun (1); the composite ultrasonic pulse TIG welding power source A (2) and the composite ultrasonic pulse TIG welding power source B (3) are electrically connected to the double tungsten pole rotary welding gun (1).

2. The ultrasonic TIG double tungsten electrode rotary welding gun for arc additive manufacturing according to claim 1, characterized in that: The dual tungsten electrode rotary welding gun (1) comprises a motor integrated module (4), a tungsten electrode module A (5), a tungsten electrode module B (6), a wire guide nozzle (7), a wire guide tube (8), a wire guide tube fixing block (9), a welding main power quick plug (10), and a DD motor quick plug (11); the rotor of the DD motor integrated module (4) is fixedly connected to a fixing block (17); the tungsten electrode module A (5) and the tungsten electrode module B (6) are fixed to the rotor of the DD motor integrated module (4) via the fixing block (17); the motor integrated module (4) is electrically connected to the DD motor quick plug (11); and the welding main power quick plug (10) is connected to an external welding power source via a welding cable.

3. The ultrasonic TIG double tungsten electrode rotary welding gun for arc additive manufacturing according to claim 2, characterized in that: The wire guide tube (8) is fixed to a wire guide tube fixing block (9), and the wire guide tube (8) is fixed to the central axis of the double tungsten pole rotary welding gun (1) by the wire guide tube fixing block (9).

4. The ultrasonic TIG double tungsten electrode rotary welding gun for arc additive manufacturing according to claim 3, characterized in that: The tungsten electrode module A (5) and the tungsten electrode module B (6) both comprise a tungsten needle (12), a tungsten needle fixing block (13), a water cooling pipe (14), an air supply pipe (15), and a conductive block (16); the conductive block (16) is fixed to the fixing block (17); the tungsten needle fixing block (13) is fixedly connected to the conductive block (16); and the tungsten needle (12) is fixedly mounted on one side of the tungsten needle fixing block (13).

5. The ultrasonic TIG double tungsten electrode rotary welding gun for arc additive manufacturing according to claim 4, characterized in that: The tungsten needle (12) is tilted toward the central axis of the dual tungsten pole rotary welding gun (1) through a tungsten needle fixing block (13), and the fixing block (17) fixes the rotors of the tungsten electrode module A (5), the tungsten electrode module B (6) and the DD motor integrated module (4).

6. The ultrasonic TIG double tungsten electrode rotary welding gun for arc additive manufacturing according to claim 5, characterized in that: The tungsten needle fixing block (13) is a hollow structure, one end of the air supply pipe (15) extends into the interior of the tungsten needle fixing block (13), one end of the air supply pipe (15) is connected through a connecting pipe (151), a wrapping shell (152) is installed at the bottom of the tungsten needle fixing block (13), the wrapping shell (152) is connected through the connecting pipe (151), and a gap is formed between the inner wall of the wrapping shell (152) and the outer wall of the tungsten needle (12).

7. The ultrasonic TIG double tungsten electrode rotary welding gun for arc additive manufacturing according to claim 6, characterized in that: A cooling shell (145) is arranged inside the tungsten needle fixing block (13), and the cooling shell (145) is wrapped around the outer wall of the tungsten needle (12). A connecting shell (146) is correspondingly installed on the outer wall of the cooling shell (145). One end of the water cooling pipe (14) extends into the interior of the tungsten needle fixing block (13), and one end of the water cooling pipe (14) is connected to the connecting shell (146). A water pump (141) is installed on the water cooling pipe (14).

8. The ultrasonic TIG double tungsten electrode rotary welding gun for arc additive manufacturing according to claim 7, characterized in that: The outer wall of the tungsten needle fixing block (13) is installed with a folding capsule (142), and the two ends of the folding capsule (142) are respectively connected to the water cooling tube (14) and the connecting shell (146). The outer wall of the tungsten needle fixing block (13) is installed with an electric telescopic rod (144), and the output end of the electric telescopic rod (144) is connected to a connecting block (143), and the connecting block (143) is fixed to the folding capsule (142).

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