Multi-pass wire and powder coupled mig welding apparatus and method

Abstract

The present application relates to a kind of multi-path powder feeding wire and powder coupling MIG welding device and method, belong to welding technical field.Water level electric ball screw guide rail is connected with single-axis motion controller, and the control of linear motion of water level electric ball screw guide rail is realized by single-axis motion controller;Work platform is fixedly connected with water level electric ball screw guide rail, pressing plate is fixedly connected with work platform, and the fixation of welding workpiece is realized by the compression fixation function of pressing plate;Clamp connecting plate is fixedly connected with vertical electric ball screw guide rail, and used to support the weight of entire welding torch structure.Coaxial multi-channel mode is used to uniformly deliver alloy powder material to welding pool, so that powder material and wire material are melted and deposited in welding pool under the action of arc, and the effect of coupling is achieved.The composite process proposed in the present application greatly increases the space for improving welding structure performance.Protective gas support cover is provided, so that MIG welding device can smoothly carry out welding operation outdoors.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a multi-channel powder feeding wire-powder coupled MIG welding apparatus and method. Background Technology

[0002] Due to its numerous advantages, including high weld quality, high production efficiency, simple operation, wide applicability, and high material utilization, MIG welding technology has been widely used in aerospace, transportation, and marine engineering in recent years. However, the high heat input and low arc energy density of MIG welding result in poor microstructure and properties of the welded joints, indicating significant room for improvement in their performance. Currently, many researchers are exploring various methods to achieve superior MIG welding performance to meet the growing industrial demand for high-quality welding.

[0003] Studies have found that for the same base material, different welding wires produce different welding qualities. To obtain better weld quality, a welding wire specifically matched to the base material is required. This limits the optimal weld performance to the welding wire composition, and existing research is mainly based on simple welding wires, leaving significant room for further research in composite processes. The arc energy distribution in MIG welding is relatively dispersed, resulting in a small temperature gradient and slow cooling rate in the weld pool. This leads to the formation of dendritic structures in the weld pool, which are detrimental to the weld and exhibit anisotropy that severely affects weld quality. To address the shortcomings of traditional MIG welding and improve weld quality, researchers often use additional energy fields (such as electric fields, ultrasonic fields, magnetic fields, etc.), additional auxiliary processes (hammering, rolling, etc.), and coating with activators / heterogeneous nucleation particles to control the welding process and improve weld quality. However, the introduction of additional energy fields and auxiliary processes inevitably reduces equipment flexibility and welding efficiency. In particular, the method of introducing heterogeneous nucleation particles through coating significantly increases the number of welding steps and reduces welding efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-channel powder feeding wire-powder coupled MIG welding device and method, solving the problem that the performance of welded components is constrained by the composition of the wire in existing MIG welding technology. This invention uses a coaxial multi-channel approach to uniformly deliver alloy powder material into the weld pool, allowing the powder and wire to melt and deposit together in the weld pool under the action of the electric arc, achieving a coupling effect. This is a novel composite process method to improve the microstructure and properties of the deposited layer, breaking the limitations of the simple influence of the molten wire on welding performance. By adjusting the composition of the powder (such as adding stabilizing alloying elements, rare elements, ceramic particles, etc.), it complements the welding wire, quantitatively and qualitatively improving the microstructure and properties of the weld and the forming accuracy of the welded component. This invention adds a protective gas shield, increasing the protection range and intensity of the protective gas, enabling the MIG welding device to perform welding operations smoothly outdoors.

[0005] The above-mentioned objective of the present invention is achieved through the following technical solution:

[0006] The multi-channel powder feeding wire-powder coupled MIG welding device consists of a horizontal electric ball screw guide 6, a vertical electric ball screw guide 10, and a single-axis motion controller 15, all fixedly connected to the main mounting frame 5 with screws. The welding power supply 1, wire feeder 2, shielding gas supply cylinder 4, powder feeder supply cylinder 16, carrier gas powder feeder 17, and MIG welding torch air-cooled supply cylinder 19 are placed beside the main mounting frame 5, their placement ensuring normal operation. The horizontal electric ball screw guide 6 is connected to the single-axis motion controller 15 via wires, which controls the linear motion of the horizontal electric ball screw guide 6. The work platform 7 is connected to the horizontal electric ball screw guide... The rail 6 is fixedly connected, and the pressure plate 14 is fixedly connected to the work platform 7. The pressure plate 14 is used to fix the welding workpiece 9. The clamping and fixing function of the pressure plate 14 is used to fix the workpiece 9. The clamping connecting plate 11 is fixedly connected to the vertical electric ball screw guide rail 10 through the clamping connecting plate mounting screw 11-1 to support the weight of the entire welding gun structure. The clamping support 13 is connected to the clamping connecting plate 11 through the clamping support mounting screw 13-2. The end of the welding gun clamp 12 is coaxially installed with the inner hole of the clamping support 13, and the clamping and fixing of the welding gun clamp 12 is achieved through the locking screw 13-1. The welding gun clamping handle 8-9 is clamped and fixed through the welding gun clamp 12, thereby fixing the wire and powder coupling gun head 8.

[0007] The wire-powder coupling gun head 8 is as follows: the welding gun clamping handle 8-9 is threadedly connected to the gun head inner shell 8-14, and the gun head outer shell 8-13 is threadedly connected to the gun head inner shell 8-14; the copper powder feeding tube 8-6 is rigidly connected to the gun head inner shell 8-14 by welding, and the powder feeding tube connector 8-7 is threadedly connected to the copper powder feeding tube 8-6; the MIG welding gun 8-10 is coaxially installed with the inner hole of the welding gun clamping handle 8-9, and the MIG welding gun 8-10 is locked by the set screw 8-8. Tightly fixed; the protective gas support cover 8-3 is installed on the gun head shell 8-13, and is tightened and fixed by the clamping nut 8-12 to ensure the oxygen-free environment of the working area; the hollow solenoid 8-5 cooperates with the hollow solenoid fixing nut 8-4 and is installed on the protective gas support cover 8-3 to input the protective gas; the laminar flow mesh 8-1 is installed inside the protective gas support cover 8-3 and is fixed by the laminar flow mesh mounting screw and nut pair 8-2 to realize the uniform and slow entry of the protective gas into the working area.

[0008] The aforementioned gas-type powder feeder 17 has two modes: powder feeding and gas feeding. The adjustable range of the gas supply rate is 0~20L / min. The carrier gas is argon or nitrogen. The adjustable pressure range is -0.1MPa~1MPa. The powder tank volume is 1.2L. The powder tray rotation speed range is 0~10r / min. The particle size of the powder used is 90~300 mesh. The gas supply bottle 16 supplies gas to the gas-type powder feeder 17, and the gas supplied is argon.

[0009] When the air-carrying powder feeder 17 is used, the powder feeding mode is selected to deliver powder to the working area. The powder and welding wire 8-11 enter the molten pool together. Trace alloying elements can be added to the powder to adjust and improve the performance of the welded workpiece 9. The powder tray speed adjustment range is 0~10r / min.

[0010] The single-channel powder output from the air-carrying powder feeder 17 is converted into a multi-channel powder input wire and powder coupling gun head 8 through an eight-way air pipe adapter 18, ensuring the uniformity and continuity of the powder entering the working area from the wire and powder coupling gun head 8.

[0011] The single-channel protective gas output from the protective gas supply cylinder 4 is converted into a multi-channel protective gas input to the wire and powder coupling gun head 8 through the twelve-port gas adapter 3, ensuring an oxygen-free environment during the welding process. The type of protective gas is argon.

[0012] The linear motion speed adjustment range of the horizontal electric ball screw guide 6 is 0~1000mm / s, the adjustment accuracy is 0.01mm / s, the effective stroke is 1000mm, and the load capacity is no more than 100kg.

[0013] The clamp support mounting screw 13-2 moves in the guide hole 11-2 of the clamp connecting plate 11, thereby realizing the adjustment of the working position of the entire gun head.

[0014] Another object of the present invention is to provide a multi-channel powder feeding wire-powder coupled MIG welding method, comprising the following steps:

[0015] Step 1: Use an angle grinder to remove the oxide film on the surface of the base material of the welding workpiece 9, and press and fix the base material on the work platform 7 by the pressure plate 14;

[0016] Step 2: Adjust the vertical electric ball screw guide rail 10 so that the bottom surface of the wire-powder coupling gun head 8 is 18mm away from the upper surface of the base material, with an adjustment accuracy of 0.01mm / s; and adjust the position of the clamp support 13 on the clamp connecting plate 11.

[0017] Step 3: Adjust the single-axis motion controller 15 to control the horizontal electric ball screw guide rail 6 to move linearly, driving the work platform 7 to the position of the welding start point, that is, 50mm away from the edge of the base material. Set the automatic scanning speed to 0.5-100mm / s, adjust and determine the parameters of the welding power supply 1 to wire feed speed of 0.1-50m / min and welding voltage of 0.1-50V, adjust the pressure reducing valve of the MIG welding torch gas cooling supply cylinder 19 to 20L / min, and turn on the cooling gas.

[0018] Step 4: Adjust the air-carrying powder feeder 17 to powder feeding mode, and set the powder feeding parameters as needed: powder tray speed 0.1-10 r / min, powder feeder air supply rate 0-10 L / min, and open the valve of the powder feeder air supply bottle 16 to supply air to the air-carrying powder feeder 17.

[0019] Step 5: Open the valve of protective gas supply cylinder 4 and adjust the protective gas flow rate to 5-25L / min to completely fill the working area with protective gas;

[0020] Step 6: Press the powder feeding switch of the pneumatic powder feeder 17 to feed powder into the working area;

[0021] Step 7: Press the automatic operation switch of the single-axis motion controller 15, move it to 10mm inward from the edge of the base material, press the switch of the MIG welding gun 8-10 to start the welding work. When the MIG welding gun 8-10 moves to 10mm inward from the other edge of the base material, turn off the switch of the MIG welding gun 8-10 and turn off the automatic operation switch of the single-axis motion controller 15.

[0022] Step 8: Adjust the vertical electric ball screw guide rail 10 so that the bottom surface of the wire-powder coupling gun head 8 is 18mm away from the upper surface of the welding layer, with an adjustment accuracy of 0.01mm / s.

[0023] Step 9: Adjust the single-axis motion controller 15 to control the linear motion of the horizontal electric ball screw guide rail 6, which will drive the work platform 7 to move to the starting position of the welding work. Repeat steps 7 and 8 to carry out the remaining welding work.

[0024] The beneficial effects of this invention are as follows: Compared with existing technologies, this invention proposes a novel composite process for improving the microstructure and properties of the deposited layer. It employs a coaxial, multi-channel approach to uniformly deliver alloy powder material into the weld pool, allowing the powder and wire to melt and deposit together in the pool under the action of the electric arc, achieving a coupling effect. This fills the gap in current research, which mainly focuses on simple molten wire and lacks consideration of composite welding materials. In use, by adjusting the composition of the powder (such as adding stabilizing alloying elements, rare elements, ceramic particles, etc.), it complements the wire, quantitatively and qualitatively improving the microstructure and properties of the weld and the forming accuracy of the welded component. Compared with traditional MIG welding technology, the composite process proposed in this invention significantly increases the potential for improving weld microstructure and properties. This invention incorporates a protective gas shield, increasing the protection range and intensity of the protective gas, enabling MIG welding equipment to perform welding operations smoothly outdoors. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate the invention and are used to explain it, but do not constitute an undue limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the multi-channel powder feeding wire-powder coupled MIG welding device of the present invention.

[0027] Figure 2 This is a schematic diagram of the wire-powder coupling gun head clamp structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal structure of the wire-powder coupling gun head of the present invention.

[0029] In the diagram: 1. Welding power source; 2. Wire feeder; 3. 12-port gas adapter; 4. Shielding gas cylinder; 5. Main mounting bracket; 6. Horizontal electric ball screw guide; 7. Work platform; 8. Wire and powder coupling torch head; 9. Welding workpiece; 10. Vertical electric ball screw guide; 11. Fixture connecting plate; 12. Welding torch fixture; 13. Fixture support; 14. Pressure plate; 15. Single-axis motion controller; 16. Powder feeder gas cylinder; 17. Carrier gas type powder feeder; 18. 8-port gas adapter; 19. MIG welding torch air-cooled gas cylinder; 8-1, Layer 8-1. Laminar flow screen; 8-2. Laminar flow screen mounting screw and nut assembly; 8-3. Protective air support cover; 8-4. Hollow spiral tube fixing nut; 8-5. Hollow spiral tube; 8-6. Copper powder feeding tube; 8-7. Powder feeding tube connector; 8-8. Set screw; 8-9. Welding torch clamp handle; 8-10. MIG welding torch; 8-11. Welding wire; 8-12. Compression nut; 8-13. Torch head outer shell; 8-14. Torch head inner shell; 11-1. Fixture connecting plate mounting screw; 11-2. Guide hole; 13-1. Locking screw; 13-2. Fixture support mounting screw. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] See Figures 1 to 3 As shown, this invention relates to a multi-channel powder feeding wire-powder coupled MIG welding device and method. The invention designs a wire-powder coupled welding torch, achieving coaxial coupling between multi-channel uniform powder feeding and welding wire. In application, the microstructure and properties of the welded components can be improved by adjusting the powder composition and content, achieving a synergistic effect between the powder and wire. Compared to traditional MIG welding, the synergistic effect of powder / wire allows for more convenient control of the weld microstructure, significantly increasing the potential for performance improvement in the welded joint.

[0032] See Figures 1 to 3As shown, the multi-channel powder feeding wire-powder coupled MIG welding device of the present invention includes a welding power source 1, a wire feeder 2, a twelve-port gas pipe adapter 3, a protective gas supply cylinder 4, a main mounting frame 5, a horizontal electric ball screw guide rail 6, a working platform 7, a wire-powder coupled torch head 8, a welding workpiece 9, a vertical electric ball screw guide rail 10, a fixture connecting plate 11, a welding torch fixture 12, a fixture support 13, a pressure plate 14, a single-axis motion controller 15, a powder feeder gas supply cylinder 16, a carrier gas type powder feeder 17, an eight-port gas pipe adapter 18, and a MIG welding torch air-cooled gas supply cylinder 19. The horizontal electric ball screw guide rail 6, the vertical electric ball screw guide rail 10, and the single-axis motion controller 15 are respectively fixedly connected to the main mounting frame 5 with screws; the placement of the welding power supply 1, wire feeder 2, protective gas supply cylinder 4, powder feeder supply cylinder 16, carrier gas powder feeder 17, and MIG welding torch gas-cooled supply cylinder 19 should ensure the normal operation of the device; the horizontal electric ball screw guide rail 6 is connected to the single-axis motion controller 15 through wires, and the single-axis motion controller 15 realizes the control of the linear motion of the horizontal electric ball screw guide rail 6; the working platform 7 is fixedly connected to the horizontal electric ball screw guide rail 6; the pressure plate 14 and The working platform 7 is fixedly connected, and the workpiece 9 is fixed by the clamping and fixing function of the pressure plate 14; the clamp connecting plate 11 and the vertical electric ball screw guide rail 10 are fixedly connected by the clamp connecting plate mounting screw 11-1 to support the weight of the entire welding gun structure; the clamp support 13 is connected to the clamp connecting plate 11 by the clamp support mounting screw 13-2; the end of the welding gun clamp 12 is coaxially installed with the inner hole of the clamp support 13, and the welding gun clamp 12 is clamped and fixed by the locking screw 13-1. The welding gun clamp 12 clamps and fixes the welding gun holding handle 8-9, thereby fixing the wire and powder coupling gun head 8.

[0033] Furthermore, the powder coupling gun head 8 structure includes a laminar flow mesh 8-1, a laminar flow mesh mounting screw and nut pair 8-2, a protective air support cover 8-3, a hollow spiral tube fixing nut 8-4, a hollow spiral tube 8-5, a copper powder feeding tube 8-6, a powder feeding tube connector 8-7, a set screw 8-8, a welding gun clamping handle 8-9, a MIG welding gun 8-10, welding wire 8-11, a clamping nut 8-12, a gun head outer shell 8-13, and a gun head inner shell 8-14. The welding torch clamping handle 8-9 is threadedly connected to the inner shell of the torch head 8-14, and the outer shell of the torch head 8-13 is threadedly connected to the inner shell of the torch head 8-14; the copper powder feeding tube 8-6 is rigidly connected to the inner shell of the torch head 8-14 by welding, and the powder feeding tube connector 8-7 is threadedly connected to the copper powder feeding tube 8-6; the MIG welding torch 8-10 is coaxially installed with the inner hole of the welding torch clamping handle 8-9, and is locked and fixed by the set screw 8-8; The protective gas support 8-3 is installed on the nozzle housing 8-13 and is tightened and fixed by the clamping nut 8-12 to ensure an oxygen-free environment in the working area; the hollow solenoid 8-5 cooperates with the hollow solenoid fixing nut 8-4 and is installed on the protective gas support 8-3 to input protective gas; the laminar flow mesh 8-1 is installed inside the protective gas support 8-3 and is fixed by the laminar flow mesh mounting screw and nut pair 8-2 to achieve uniform and slow entry of protective gas into the working area.

[0034] Furthermore, the carrier gas powder feeder 17 described in this embodiment has two modes available: powder feeding and gas feeding. The adjustable range of the powder feeder's gas supply rate is 0~20L / min, the carrier gas is argon or nitrogen, the adjustable pressure range is -0.1MPa~1MPa, the powder hopper volume is 1.2L, the powder tray rotation speed range is 0~10r / min, and the particle size of the powder used is 90~300 mesh. The powder feeder gas supply bottle 16 supplies gas to the carrier gas powder feeder 17, and the gas supplied is argon.

[0035] Furthermore, when the air-carrying powder feeder 17 is used, it selects the powder feeding mode to deliver powder to the working area. The powder and welding wire 8-11 enter the molten pool together. Trace alloying elements can be added to the powder to adjust and improve the performance of the welded workpiece 9. The powder tray speed adjustment range is 0~10r / min.

[0036] Furthermore, the single-channel powder output from the air-carrying powder feeder 17 is converted into a multi-channel powder input wire and powder coupling gun head 8 through an eight-way air pipe adapter 18, ensuring the uniformity and continuity of the powder as it enters the working area from the wire and powder coupling gun head 8.

[0037] Furthermore, the single-channel protective gas output from the protective gas supply cylinder 4 is converted into a multi-channel protective gas input to the welding wire and powder coupling gun head 8 through the twelve-port gas adapter 3, ensuring an oxygen-free environment during the welding process. The type of protective gas is argon.

[0038] Furthermore, the linear motion speed adjustment range of the horizontal electric ball screw guide 6 is 0~1000mm / s, the adjustment accuracy is 0.01mm / s, the effective stroke is 1000mm, and the load-bearing capacity is no more than 100kg.

[0039] Furthermore, the displacement accuracy of the working platform and the vertical electric ball screw guide rail are both ±0.01mm, the speed adjustment range is 0~1000mm / s, and the adjustment accuracy is 0.01mm / s.

[0040] Furthermore, the clamp support mounting screw 13-2 can move in the guide hole 11-2, thereby realizing the adjustment of the working position of the entire gun head.

[0041] This embodiment provides a multi-channel powder feeding wire-powder coupled MIG welding method, which includes the following steps:

[0042] Step 1: Use an angle grinder to remove the oxide film on the surface of the base material of the welding workpiece 9, and press and fix the base material on the work platform 7 by the pressure plate 14.

[0043] Step 2: Adjust the vertical electric ball screw guide rail 10 so that the bottom surface of the wire-powder coupling gun head 8 is 18mm away from the upper surface of the base material, with an adjustment accuracy of 0.01mm / s. Adjust the position of the fixture support 13 on the fixture connecting plate 11 as needed.

[0044] Step 3: Adjust the single-axis motion controller 15 to control the linear motion of the horizontal electric ball screw guide rail 6, driving the work platform 7 to move to the starting position of the welding work, that is, 50mm away from the edge of the base material. Set the automatic scanning speed to 0.5-100mm / s. Adjust and determine the parameters of the welding power supply 1 to wire feed speed of 0.1-50m / min and welding voltage of 0.1-50V. Adjust the pressure reducing valve of the MIG welding torch gas cooling supply cylinder 19 to 20L / min and turn on the cooling gas.

[0045] Step 4: Adjust the air-carrying powder feeder 17 to powder feeding mode, set the powder feeding parameters as needed to powder tray speed of 0.1-10 r / min, air supply rate of powder feeder of 0-10 L / min, and open the valve of air supply cylinder 16 of powder feeder to supply air to air-carrying powder feeder 17.

[0046] Step 5: Open the valve of protective gas supply cylinder 4 and adjust the protective gas flow rate as needed to completely fill the work area with protective gas.

[0047] Step 6: Press the powder feeding switch on the pneumatic powder feeder 17 to feed powder into the working area.

[0048] Step 7: Press the automatic operation switch of the single-axis motion controller 15, move it to 10mm inward from the edge of the base material, press the switch of the MIG welding gun 8-10 to start the welding work. When the MIG welding gun 8-10 moves to 10mm inward from the other edge of the base material, turn off the switch of the MIG welding gun 8-10 and turn off the automatic operation switch of the single-axis motion controller 15.

[0049] Step 8: Adjust the vertical electric ball screw guide rail 10 so that the bottom surface of the wire-powder coupling gun head 8 is 18mm away from the upper surface of the welding layer, with an adjustment accuracy of 0.01mm / s.

[0050] Step 9: Adjust the single-axis motion controller 15 to control the linear motion of the horizontal electric ball screw guide rail 6, which will drive the work platform 7 to move to the starting position of the welding work. Repeat steps 7 and 8 to carry out the remaining welding work.

[0051] Step 10: After the workpiece is processed, turn off the powder feeding switch of the carrier gas powder feeder 17, turn off the valves of the powder feeder gas cylinder 16, the protective gas cylinder 4, and the MIG welding torch air cooling cylinder 19, and turn off the power supply of the welding power supply 1, the single-axis motion controller 15, and the carrier gas powder feeder 17. The work is over.

[0052] Example: Wire-powder coupled MIG butt welding of 8mm titanium alloy plates with multi-channel powder feeding

[0053] Remove the oxide film from the butt joint surface and welding surface of the plates in step one. Add 40μm SiC powder to the powder feeder 17. Adjust the vertical electric ball screw guide rail 10 so that the bottom surface of the wire-powder coupling gun head 8 is 18mm away from the upper surface of the base material. Adjust the fixture support 13 to the edge position of the guide hole 11-2 on the fixture connecting plate 11. Adjust the single-axis motion controller 15 to control the linear movement of the horizontal electric ball screw guide rail 6, driving the work platform 7 to a position 50mm away from the edge of the base material, and set the automatic scanning speed to 5mm / s. Adjust the welding power supply 1 to MIG mode, the voltage parameter to 30V, the wire feeding speed to 8m / min, adjust the pressure reducing valve of the MIG welding gun gas cooling supply cylinder 19 to 20L / min, and connect the cooling gas. Adjust the carrier gas powder feeder 17 to powder feeding mode, set the powder tray speed to 0.5 r / min, and the powder feeder air supply rate to 10 L / min. Open the valve of the powder feeder air supply cylinder 16 to supply air to the carrier gas powder feeder 17. Open the valve of the protective gas supply cylinder 4 and adjust the protective gas flow rate to 10 L / min as needed to completely fill the working area with protective gas. Press the automatic operation switch of the single-axis motion controller 15, move it to 10 mm inward from the edge of the base material, press the switch of the MIG welding torch 8-10 to start the welding work. When the MIG welding torch 8-10 moves to 10 mm inward from the other edge of the base material, turn off the switch of the MIG welding torch 8-10, turn off the automatic operation switch of the single-axis motion controller 15, complete the welding work, and turn off the power.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made to the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-channel powder feeding wire-powder coupled MIG welding device, characterized in that: The horizontal electric ball screw guide (6), the vertical electric ball screw guide (10), and the single-axis motion controller (15) are fixedly connected to the main mounting frame (5) by screws respectively; the welding power supply (1), wire feeder (2), protective gas supply cylinder (4), powder feeder supply cylinder (16), carrier gas powder feeder (17), and MIG welding torch air-cooled supply cylinder (19) are placed next to the main mounting frame (5); the horizontal electric ball screw guide (6) is connected to the single-axis motion controller (15) through wires, and the linear motion of the horizontal electric ball screw guide (6) is controlled by the single-axis motion controller (15); the working platform (7) is fixedly connected to the horizontal electric ball screw guide (6), and the pressure plate (14) is fixedly connected to the working platform. The platform (7) is fixedly connected, and the welding workpiece (9) is fixed by the clamping and fixing function of the pressure plate (14); the clamp connecting plate (11) and the vertical electric ball screw guide rail (10) are fixedly connected by the clamp connecting plate mounting screw (11-1) to support the weight of the entire welding gun structure; the clamp support (13) is connected to the clamp connecting plate (11) by the clamp support mounting screw (13-2); the end of the welding gun clamp (12) is coaxially installed with the inner hole of the clamp support (13), and the welding gun clamp (12) is clamped and fixed by the locking screw (13-1); the welding gun clamping handle (8-9) is clamped and fixed by the welding gun clamp (12), thereby fixing the wire and powder coupling gun head (8); The wire-powder coupling gun head (8) is as follows: the welding gun holder (8-9) and the gun head inner shell (8-14) are connected by threads; the gun head outer shell (8-13) and the gun head inner shell (8-14) are connected by threads; the copper powder feeding tube (8-6) is rigidly connected to the gun head inner shell (8-14) by welding; the powder feeding tube connector (8-7) and the copper powder feeding tube (8-6) are connected by threads; the MIG welding gun (8-10) is coaxially installed with the inner hole of the welding gun holder (8-9), and the MIG welding gun (8-10) is secured by a set screw (8-8). The protective gas support cover (8-3) is installed on the gun head shell (8-13) and is pressed and fixed by the pressure nut (8-12) to ensure the oxygen-free environment of the working area; the hollow solenoid (8-5) is installed on the protective gas support cover (8-3) in conjunction with the hollow solenoid fixing nut (8-4) to input the protective gas; the laminar flow mesh (8-1) is installed inside the protective gas support cover (8-3) and fixed by the laminar flow mesh mounting screw and nut pair (8-2) to achieve uniform and slow entry of the protective gas into the working area.

2. The multi-channel powder feeding wire-powder coupled MIG welding device according to claim 1, characterized in that: The aforementioned gas-carrying powder feeder (17) has two modes: powder feeding and gas feeding. The gas supply rate of the powder feeder can be adjusted from 0 to 20 L / min. The carrier gas is argon or nitrogen. The pressure can be adjusted from -0.1 MPa to 1 MPa. The powder tank volume is 1.2 L. The powder disc rotation speed range is 0 to 10 r / min. The particle size of the powder used is 90 to 300 mesh. The gas supply bottle (16) of the powder feeder supplies gas to the gas-carrying powder feeder (17). The gas supply type is argon.

3. The multi-channel powder feeding wire-powder coupled MIG welding device according to claim 1, characterized in that: When the air-carrying powder feeder (17) is used, the powder feeding mode is selected to deliver powder to the working area. The powder and welding wire (8-11) enter the molten pool together. Trace alloying elements can be added to the powder to adjust and improve the performance of the welded workpiece (9). The powder tray speed adjustment range is 0~10r / min.

4. The multi-channel powder feeding wire-powder coupled MIG welding device according to claim 1, characterized in that: The single-channel powder output from the air-carrying powder feeder (17) is converted into a multi-channel powder input wire and powder coupling gun head (8) through an eight-way air pipe adapter (18), ensuring the uniformity and continuity of the powder entering the working area from the wire and powder coupling gun head (8).

5. The multi-channel powder feeding wire-powder coupled MIG welding device according to claim 1, characterized in that: The single-channel protective gas output from the protective gas supply cylinder (4) is converted into a multi-channel protective gas input into the wire and powder coupling gun head (8) through the twelve-port gas pipe adapter (3) to ensure an oxygen-free environment during the welding process. The type of protective gas is argon.

6. The multi-channel powder feeding wire-powder coupled MIG welding device according to claim 1, characterized in that: The horizontal electric ball screw guide (6) has a linear motion speed adjustment range of 0~1000mm / s, an adjustment accuracy of 0.01mm / s, an effective stroke of 1000mm, and a load capacity of no more than 100kg.

7. The multi-channel powder feeding wire-powder coupled MIG welding device according to claim 1, characterized in that: The fixture support mounting screw (13-2) moves in the guide hole (11-2) of the fixture connecting plate (11), thereby realizing the adjustment of the working position of the entire gun head.

8. A method for multi-channel powder feeding wire-to-powder coupled MIG welding using the multi-channel powder feeding wire-to-powder coupled MIG welding device according to any one of claims 1-7, characterized in that: Includes the following steps: Step 1: Use an angle grinder to remove the oxide film on the surface of the base material of the welding workpiece (9), and press and fix the base material on the work platform (7) by the pressure plate (14); Step 2: Adjust the vertical electric ball screw guide rail (10) so that the bottom surface of the wire and powder coupling gun head (8) is 18mm away from the upper surface of the base material, with an adjustment accuracy of 0.01mm / s; and adjust the position of the fixture support (13) on the fixture connecting plate (11) as needed. Step 3: Adjust the single-axis motion controller (15) to control the horizontal electric ball screw guide rail (6) to move linearly, and drive the work platform (7) to the position of the welding start point, that is, 50mm away from the edge of the base material. Set the automatic scanning speed to 0.5-100mm / s, adjust and determine the parameters of the welding power supply (1) to wire feed speed of 0.1-50m / min and welding voltage of 0.1-50V, adjust the pressure reducing valve of the MIG welding torch gas cooling supply cylinder (19) to 20L / min, and turn on the cooling gas. Step 4: Adjust the air-carrying powder feeder (17) to powder feeding mode, set the powder feeding parameters as needed to powder tray speed of 0.1-10 r / min, air supply rate of powder feeder of 0-10 L / min, and open the valve of air supply bottle (16) of powder feeder to supply air to air-carrying powder feeder (17). Step 5: Open the valve of the protective gas supply cylinder (4) and adjust the protective gas flow rate to 5-25L / min to completely fill the working area with protective gas; Step 6: Press the powder feeding switch of the pneumatic powder feeder (17) to feed powder into the working area; Step 7: Press the automatic operation switch of the single-axis motion controller (15), move it to 10mm inward from the edge of the base material, press the switch of the MIG welding gun (8-10) to start the welding work. When the MIG welding gun (8-10) moves to 10mm inward from the other edge of the base material, turn off the switch of the MIG welding gun (8-10) and turn off the automatic operation switch of the single-axis motion controller (15). Step 8: Adjust the vertical electric ball screw guide rail (10) so that the bottom surface of the wire and powder coupling gun head (8) is 18mm away from the upper surface of the welding layer, with an adjustment accuracy of 0.01mm / s; Step 9: Adjust the single-axis motion controller (15) to control the horizontal electric ball screw guide rail (6) to move linearly, driving the work platform (7) to the position of the starting point of the welding work. Repeat steps 7 to 8 to carry out the remaining welding work.

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