Axial side multi-path shielding gas feeding type gas metal arc welding torch and method

Abstract

The invention discloses a shaft side multi-path shielding gas feeding type gas metal arc welding torch and method. The device mainly comprises a welding gun main body, a gas screen, a copper nozzle, a copper pipe, welding shielding gas, a shielding gas meter, a shielding gas conveying hose and the like. Compared with an original common gas metal arc welding torch, the gas metal arc welding torch has the advantages that the effective protection area of a welding area can be enlarged, and high-temperature metal in a to-be-welded area is prevented from being polluted by air; and different types of shielding gases can be subjected to shunting regulation and control, so that positioning and quantitative control of active elements in the shielding gases are realized. Positioning control is achieved by adjusting the relative position of the lateral gas path and the to-be-welded part, quantitative control is achieved by adjusting the gas flow in the gas path, and collaborative improvement of welding joint forming and mechanical performance is facilitated. The internal structure of original integrated welding equipment does not need to be changed, an external air entraining mode is adopted, the implementation cost is low, convenience and flexibility are achieved, and the executability is good.

Description

Technical Field

[0001] The present invention relates to the field of gas metal arc welding, particularly to the gas metal arc welding process of materials with high requirements for welding protective atmosphere and the gas metal arc welding process of dissimilar metals. Background Art

[0002] Welding, known as the "industrial tailor", is a reliable means to achieve the connection of metal materials. During the welding process, the molten high-temperature metal is extremely easy to be oxidized by air, resulting in defects such as inclusions and pores, seriously reducing the quality of the welded joint. Usually, an inert gas, such as argon, needs to be introduced into the welding area as a protective gas to displace the air in the welding area to avoid the adverse effects of air on the weld metal. Therefore, the size of the effective gas protection area at the welding part has a very important impact on the joint quality. In gas metal arc welding, in order to effectively assemble with the main body of the welding torch, the size of the welding torch nozzle is usually fixed, which limits the effective protection area of the gas. When the weld size varies greatly, or the metal to be welded has high requirements for the protective atmosphere, the practicability of such a welding torch is reduced. By customizing a welding torch with a special structure, the protection effect can be improved, but the cost is high and it cannot be popularized and applied. Therefore, designing and adding an external gas path to the original welding torch can not only expand the effective protection area, but also reduce the manufacturing cost and has good practicability. In addition, some metal materials, such as steel, have the Marangoni effect, that is, when a certain amount of active elements are dissolved in the molten steel, such as oxygen element, the flow direction of the molten pool will change significantly, significantly improving the weld formation, and at the same time being beneficial to the homogenization of the molten pool structure. Especially when welding two different metal materials, that is, dissimilar metal welding, taking the welding process of stainless steel / titanium alloy dissimilar metals as an example, an appropriate concentration of oxygen is beneficial to the flow of the molten steel, but titanium alloy is extremely sensitive to the oxygen content and is extremely easy to oxidize. Therefore, it is necessary to specially design the addition orientation of the oxygen element. By designing and adding an external gas path to introduce gases such as carbon dioxide or oxygen on the stainless steel side, the flow of the molten pool can be improved while avoiding the adverse effects of oxygen element on the titanium alloy. Therefore, the present invention designs an axis-side multi-channel protective gas feeding type gas metal arc welding torch and method, which can not only expand the effective gas protection area, but also realize the coordinated improvement of the formation and performance of dissimilar metal welded joints. The present invention is not only applicable to the welding of the same material, but also applicable to the gas protection welding processes of various dissimilar metals including titanium / steel, aluminum / steel, aluminum / titanium, and aluminum / magnesium. Summary of the Invention

[0003] The main purpose of the present application is to provide an axis-side multi-channel protective gas feeding type gas metal arc welding torch and method, which can not only expand the effective gas protection area, but also realize the positioning and quantitative control of active elements, significantly improving the formation and performance of the welded joint.

[0004] According to the first aspect of the present invention, there is provided an axial multi-channel protected gas-fed MIG torch, which mainly includes a torch body, a gas sieve, a contact tip, a copper nozzle, a copper tube, welding protective gas, a protective gas meter, a protective gas delivery hose, an electromagnetic gas valve, and other components.

[0005] Preferably, for the axial multi-channel protected gas-fed MIG torch, a square groove is formed on the side of the copper nozzle, and the copper tube is inserted into the square groove to achieve a reliable connection between the copper tube and the grooved copper nozzle.

[0006] Preferably, for the axial multi-channel protected gas-fed MIG torch, after the grooved copper nozzle and the copper tube are connected, they form an integral unit and are assembled on the torch body, and the installation method is the same as that of the original ordinary MIG torch.

[0007] Preferably, for the axial multi-channel protected gas-fed MIG torch, the grooved copper nozzle and the copper tube are respectively connected to different protective gas cylinders to introduce multiple strands of protective gas. Among them, the grooved copper nozzle is connected to the original gas path inside the welding machine, and the upper end of the copper tube is connected to another welding protective gas cylinder through a protective gas delivery hose, an electromagnetic gas valve, and a protective gas meter. The gas path of the copper nozzle is called the axial gas path, and the gas path of the copper tube is called the lateral gas path.

[0008] Preferably, for the axial multi-channel protected gas-fed MIG torch, it is allowed to form multiple square grooves on the side of the copper nozzle to connect multiple copper tubes, and the number of formed square grooves is the same as the number of copper tubes used. When one copper tube is connected to the side, it is an axial dual-channel protected gas-fed torch; when two or more copper tubes are connected, it is an axial multi-channel protected gas-fed torch. Considering the manufacturing cost of the device and the protective effect of the protective gas, the number of copper tubes (i.e., the number of lateral gas paths) does not exceed 4. When multiple copper tubes are used, it is stipulated that the included angle of the projections of adjacent copper tubes on the welding plane is γ, and the distribution position of different copper tubes is adjusted by changing the included angle γ, and the adjustment range of γ is 0 to 180°. According to actual welding requirements, the copper tubes can be evenly distributed or unevenly distributed along the outer wall of the nozzle. When evenly distributed, γ1 = γ2 = γ3 = γ4; when unevenly distributed, γ1, γ2, γ3, and γ4 are not equal at the same time.

[0009] Preferably, for the axially multi-channel protected gas-fed MIG torch described above, it is characterized in that parameters such as the inner diameter D of the copper nozzle of the welding torch, the width a of the square groove opened on the copper nozzle of the welding torch, the length b of the square groove, the inner diameter d of the copper tube, the length L of the copper tube, the axial spacing l between the copper nozzle and the copper tube, the angle α between the axis of the copper tube and the axis of the copper nozzle, and the distance δ between the lower end surfaces of the copper tubes can all be adjusted as needed. Among them, there are no strict requirements for the width and length of the square groove. The size of the square groove should enable the copper tube to be tightly embedded. After being connected to the copper nozzle, no air leakage or other phenomena should occur. Therefore, the size of the square groove should be matched with the size of the used copper tube. The length of the copper tube is to ensure that the internal gas flow is stable and flows out in a laminar flow manner without disturbing the welding area turbulently. Therefore, the length L of the copper tube should not be less than 30 mm. In addition, the inner diameter D of the copper nozzle should be 10 - 30 mm, the diameter d of the copper tube should be 2 - 15 mm, the axial spacing l should be 4 - 22 mm, δ should be between -5 and +5 mm, and α can be adjusted within 0 - 90°. According to actual welding needs, when using two or more copper tubes, the size parameters involved in each copper tube, such as d, L, l, α, δ, etc., can be the same or different, but all need to be adjusted within the ranges involved above.

[0010] Preferably, for the axially multi-channel protected gas-fed MIG torch described above, it is characterized in that both the axial gas path and the lateral gas path can be independently adjusted and do not interfere with each other. The gas flow rate ranges of both the axial and lateral gas paths are 0 - 30 L / min. The type of gas passed through the lateral gas path can be the same as or different from that of the axial gas path; when there are multiple lateral gas paths, the types of shielding gas inside each lateral gas path can be the same or different. When the types of gas passed through each gas path are the same, its function is no different from that of the nozzle of the original ordinary MIG torch, mainly playing a role in protecting the welding area, but the effective protection area is increased; when the types of gas passed through are different, in addition to protecting the welding area, CO2 or O2 or other gases can also be introduced. By changing the gas flow rate inside the axial and lateral gas paths, the mixing degree and concentration of the externally introduced gas and the original gas inside the welding machine are changed, so as to change the concentration of the active elements (such as O) dissolved in the molten pool after ionization in the shielding gas, and realize the metallurgical control of the welding molten pool.

[0011] Preferably, for the axially multi-channel protected gas-fed MIG torch described above, it is characterized in that the relative position between the lateral gas path and the molten pool is adjustable. It is stipulated that the projection angle θ between the lateral gas path and the welding direction on the welding plane. Taking the example of passing Ar through the axial gas path and CO2 gas through the lateral gas path, the value of θ can be changed by rotating the nozzle, so that the lateral gas path is placed on one side of the base material Ⅰ, one side of the base material Ⅱ, in front of the molten pool, behind the molten pool or any other position, and the orientation of the CO2 gas entering the molten pool is changed to realize the metallurgical control of the molten pool.

[0012] Preferably, for the axial multi-channel protected gas-fed MIG torch, it is characterized in that both the axial gas path and the lateral gas path are controlled by electromagnetic gas valves. After a gas supply command is given, the axial gas path and the lateral gas path will supply gas according to the given gas flow rate. When welding is completed, the gas supply ends. The entire gas supply process is timed and quantified, and is safe and controllable.

[0013] Preferably, for the axial multi-channel protected gas-fed MIG torch, it is characterized in that by optimizing the torch structure design, one or more additional protection gases are added externally without changing the original integrated welding equipment, which has low cost, is flexible and convenient, and has high executability.

[0014] According to the second aspect of the present invention, a method for using the axial multi-channel protected gas-fed MIG torch is provided, including the following steps:

[0015] Step 1: Before performing the MIG welding test, the plate to be welded should be carefully cleaned and firmly clamped on the working platform.

[0016] Step 2: Determine the position where the active gas is to be introduced, or determine the position where the protection area needs to be expanded. Adjust θ by rotating the nozzle to change the relative position between the lateral gas path and the part to be welded. If you want to introduce the active gas near the base metal on a certain side, or the gas protection range of the base metal on a certain side needs to be expanded, then rotate the lateral gas path above this type of plate. If you want to introduce the active gas in multiple directions at the same time, or expand the protection area of multiple parts, then multiple copper tubes can be used simultaneously to add multiple lateral gas paths. At this time, it is an axial multi-channel protected gas-fed torch.

[0017] Step 3: Connect the gas path, open the protection gas cylinder, check whether the gas remaining in the protection gas cylinder is sufficient. If the air pressure is too low, the gas cylinder needs to be replaced. Manually supply gas to ensure that there is no foreign object blocking inside the gas path, and set the gas flow rates required for the two gas paths respectively.

[0018] Step 4: Check the wire feeding channel to ensure that the wire feeding pipeline is unobstructed by foreign objects, and set the wire dry extension between 10 - 20 mm.

[0019] Step 5: Set process parameters such as welding current, voltage, wire feeding speed, etc. through the welding machine teaching panel, and set the welding speed.

[0020] Step 6: Locate the welding start point and end point. To ensure the protection effect of the welding area, set the gas supply for 5 - 30 s before arc starting, start the welding program, and start performing MIG welding.

[0021] Step 7: After welding is completed, stop supplying the shielding gas. After the workpiece cools down, clean the surface of the weld seam with a wire brush, remove the clamped parts on the working platform, and take down the workpiece to complete the welding. The present invention provides an axially multi-channel shielding gas feeding type gas metal arc welding torch and method. When the gases passed through the axial gas path and the lateral gas path are the same, the effective gas protection area can be expanded; when the gases passed through the axial gas path and the lateral gas path are different, by changing the relative position between the lateral gas path and the part to be welded, the orientation of the active element entering the molten pool can be controlled, and by changing the gas flow rates of the axial gas path and the lateral gas path, the concentration of the active element entering the molten pool can be controlled, so that the metallurgical regulation of the active element on the molten pool can be realized. This device can not only expand the effective gas protection area, but also realize the positioning and quantitative control of the active element in the molten pool. While regulating the flow of the molten pool, it effectively reduces the adverse effects of excessive active elements on the high-temperature liquid metal, and realizes the coordinated improvement of the joint forming and performance. The present invention is applicable not only to the welding of the same kind of materials, but also to the gas shielded welding of various dissimilar metals including titanium / steel, aluminum / steel, aluminum / titanium, and aluminum / magnesium. Description of the Drawings

[0022] Through the following description of the embodiments of the present invention with reference to the drawings, the above and other objects, features and advantages of the present invention will become clearer. In the drawings:

[0023] Figure 1 is a schematic diagram of a single-sided grooved copper nozzle to clearly show the specific grooving position;

[0024] Figure 2 is the three views of the combination of the grooved copper nozzle and the copper tube as a whole when using 1 copper tube;

[0025] Figure 3 is the gas supply schematic diagram of the axial gas path and the lateral gas path during the welding process when using 1 copper tube;

[0026] Figure 4 is the projection schematic diagram of the device on the welding plane when using multiple copper tubes, which can clearly show the relative positions between each copper tube (i.e., each lateral gas path).

[0027] In the figure, 1. grooved copper nozzle; 2. square groove opened; 3. copper tube; 4. welding torch body; 5. gas sieve; 6. contact tip; 7. welding wire; 8. plate to be welded Ⅰ; 9. plate to be welded Ⅱ, and the characteristic dimension parameters are marked in the figure. Detailed Embodiments

[0028] The following elaborates on the present invention based on the embodiments. Unless otherwise clearly required by the context, the words such as "including" and "comprising" in the whole specification and claims should be interpreted as having the meaning of inclusion rather than the meaning of "exclusive" or "exhaustive"; that is, it means "including but not limited to".

[0029] These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention. Among the various drawings, the same elements are represented by the same or similar reference numerals. For the sake of clarity, some elements in the drawings are not drawn to scale; at the same time, in order to avoid obscuring the essence of the present invention, well-known methods, processes, procedures, and elements are not described in detail.

[0030] Exemplary embodiments of the present invention will now be described below with reference to the drawings. The described exemplary embodiments are intended to assist in understanding the present invention and are not intended to limit the scope of the present invention in any way.

[0031] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, an axially multi-channel protected gas-fed MIG torch mainly includes 1. grooved copper nozzle; 2. square groove opened; 3. copper tube; 4. welding gun body; 5. gas sieve; 6. contact tip; 7. welding wire; 8. plate to be welded Ⅰ; 9. plate to be welded Ⅱ. Among them, during actual use, the grooved nozzle is connected to the copper tube as a whole and is connected to the welding gun body in an interference fit manner. The main body of the grooved nozzle is connected to the internal gas path of the original welding machine, while the upper end surface of the side copper tube is connected to the electromagnetic gas valve through a gas supply hose to an external gas cylinder.

[0032] The specific usage method of the axially multi-channel protected gas-fed MIG torch provided by the present invention is as follows: Before performing MIG welding, check whether the axial and lateral multi-channel protected gas supply is smooth and whether the wire feeder feeds wire smoothly. Then, after carefully cleaning the plates to be welded, place them on the working platform and firmly clamp them; according to the actual process requirements, select the appropriate type of welding wire and welding process parameters, and determine the gas flow rate and the distribution orientation of the lateral gas path; turn on the power supply of the welding machine and the switch of the protected gas cylinder to make them work normally; position the starting and ending points of the welding, start the welding program, and start performing MIG welding; after welding is completed, clean the surface of the weld, close the valve of the protected gas cylinder and the switch of the welding machine, and the welding ends.

[0033] During the welding process, it is possible to form weld joints with good formation on both the front and back sides, and at the same time, it is possible to control the interface microstructure to achieve high-quality MIG welding.

[0034] The present invention also provides a welding method for TC4 / 304SS dissimilar metals by MIG, including the following steps:

[0035] Step 1: Mechanically grind the 1-mm-thick TC4 and 304SS plates to remove the oxide film on the plate surface, and then wipe the plate surface with cotton dipped in anhydrous ethanol or acetone to remove excess oil; after air drying, clamp them on the working platform;

[0036] Step 2: Install the CuSi3 welding wire with a diameter of 1.2 mm inside the wire feeder of the CMT welding machine, and connect it to the welding machine through the wire feeding tube to check whether the wire feeding is smooth;

[0037] Step 3: Assemble the side-axis multi-channel protective gas feeding type gas metal arc welding torch described in the present invention on the welding gun. Use a copper tube, that is, a lateral gas path, set D = 18 mm, d = 4 mm, L = 60 mm, l = 10 mm, δ = 0 mm, α = 30°, and place the lateral protective gas path above the 304SS plate;

[0038] Step 4: Connect the axial gas path, that is, the original gas path of the welding machine, to the Ar cylinder; connect the lateral protective gas path to the CO2 cylinder; turn on the valves of the two cylinders, open the manual gas supply switch, check whether the gas supply is smooth and whether the gas remaining in the cylinder is sufficient, and set the gas flow rate of the axial gas path to 15 L / min and the gas flow rate of the lateral gas path to 1.5 L / min by adjusting the gas meter knob;

[0039] Step 5: Adjust the required welding current to 70 A and the unified matching welding voltage to 9.7 V through the teach pendant of the CMT welding machine; set the welding speed to 10 mm / min through the teach pendant of the ABB robot; set the wire dry elongation to 15 mm;

[0040] Step 6: Operate the ABB six-axis robot to determine the starting arc point and the arc extinguishing point;

[0041] Step 7: Start the welding program, set the pre-gas supply for welding for 10 s, and continue to supply gas for 5 s after arc extinguishing;

[0042] Step 8: After arc extinguishing, operate the ABB robot to lift the welding gun and wait for the weld to cool;

[0043] Step 9: After the weld cools, clean the weld surface with a wire brush and remove the fixture;

[0044] Step 10: Close the valves of the Ar and CO2 cylinders, turn off the power of the CMT welding machine and the ABB robot, and the welding is completed.

[0045] Finally, it should be noted that the above embodiments are only used to clearly illustrate the examples of the present invention, rather than limiting its implementation manner; 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 the technical solutions described in the foregoing embodiments can be changed or modified in other different forms, or some or all of the technical features can be equivalently replaced; it is not necessary and impossible to enumerate all implementation manners here, and the obvious changes or modifications derived therefrom are still within the protection scope of the present invention, and do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An axially-sided multi-channel protected gas-fed MIG torch and method. The device mainly includes a torch body, a gas sieve, a contact tip, a copper nozzle, a copper tube, welding shielding gas, a shielding gas gauge, a shielding gas delivery hose, an electromagnetic gas valve, etc.

2. The axially multi-way protected gas-fed consumable electrode gas shielded welding torch according to claim 1, wherein A rectangular groove is opened on the side of the copper nozzle, and the copper tube is embedded in the rectangular groove to achieve a reliable connection between the copper tube and the grooved copper nozzle.

3. An axially multi-channel protected gas-fed consumable electrode gas shielded welding torch according to claim 1, characterized in that, After the grooved copper nozzle is connected to the copper tube, they form an integral unit and are assembled on the torch body. The installation method is the same as that of the original ordinary MIG torch.

4. An axially multi-channel protected gas-fed consumable electrode gas shielded welding torch according to claim 1, characterized in that, The grooved copper nozzle and the copper tube are respectively connected to different shielding gas cylinders to introduce multiple strands of shielding gas. Among them, the grooved copper nozzle is connected to the original gas path inside the welding machine, and the upper end of the copper tube is connected to another welding shielding gas cylinder through a shielding gas delivery hose, an electromagnetic gas valve, and a shielding gas gauge. The gas path of the copper nozzle is called the axial gas path, and the gas path of the copper tube is called the lateral gas path.

5. An axially multi-channel protected gas-fed consumable electrode gas shielded welding torch according to claim 1, characterized in that, It is allowed to open multiple rectangular grooves on the side of the copper nozzle to connect multiple copper tubes, and the number of opened rectangular grooves is the same as the number of copper tubes used. When one copper tube is connected to the side, it is an axially-sided dual-channel protected gas-fed torch; when two or more copper tubes are connected, it is an axially-sided multi-channel protected gas-fed torch. Considering the manufacturing cost of the device and the shielding effect of the shielding gas, the number of copper tubes (i.e., the number of lateral gas paths) does not exceed 4. When multiple copper tubes are used, it is stipulated that the included angle γ of the projections of adjacent copper tubes on the welding plane is adjusted to change the distribution positions of different copper tubes, and the adjustment range of γ is 0 to 180°. According to the actual welding requirements, the copper tubes can be evenly distributed along the outer wall of the nozzle or unevenly distributed. When evenly distributed, γ1 = γ2 = γ3 = γ4; when unevenly distributed, γ1, γ2, γ3, and γ4 are not all equal.

6. An axially multi-channel protected gas-fed consumable electrode gas shielded welding torch according to claim 1, characterized in that, Parameters such as the inner diameter D of the torch copper nozzle, the width a of the rectangular groove opened on the torch copper nozzle, the length b of the rectangular groove, the inner diameter d of the copper tube, the length L of the copper tube, the axial spacing l between the copper nozzle and the copper tube, the included angle α between the axis of the copper tube and the axis of the copper nozzle, and the distance δ between the lower end face of the copper tube and the lower end face of the copper nozzle can all be adjusted according to needs. Among them, there are no strict requirements for the width and length of the rectangular groove. The size of the rectangular groove should enable the copper tube to be tightly embedded. After being connected to the copper nozzle, there should be no air leakage and other phenomena. Therefore, the size of the rectangular groove should match the size of the used copper tube. The length of the copper tube is to ensure that the internal gas flow is stable and flows out in a laminar flow manner without disturbing the welding area turbulently. Therefore, the length L of the copper tube should not be less than 30 mm. In addition, the inner diameter D of the copper nozzle should be 10 to 30 mm, the diameter d of the copper tube should be 2 to 15 mm, the axial spacing l should be 4 to 22 mm, δ is between -5 and +5 mm, and α is adjusted within 0 to 90°. According to the actual welding requirements, when two or more copper tubes are used, the dimensional parameters involved in each copper tube, such as d, L, l, α, δ, etc., can be the same or different, but all need to be adjusted within the ranges mentioned above.

7. An axially multi-channel protected gas-fed consumable electrode gas shielded welding torch according to claim 1, characterized in that, Both the axial gas path and the lateral gas path can be independently adjusted without interfering with each other. The gas flow rate range of both the axial and lateral gas paths is 0 - 30 L / min. The type of gas passing through the lateral gas path can be the same as or different from that of the axial gas path; when there are multiple lateral gas paths, the types of shielding gas inside each lateral gas path can be the same or different. When the types of gas passing through each gas path are the same, its function is no different from that of the nozzle of the original ordinary MIG welding torch, mainly playing a role in protecting the welding area, but the effective protection area is increased; when the types of gas passing through are different, in addition to protecting the welding area, CO2 or O2 or other gases can also be introduced. By changing the gas flow rate inside the axial and lateral gas paths, the mixing degree and concentration of the externally introduced gas and the original gas inside the welding machine are changed, so as to change the concentration of the active elements (such as O) dissolved in the molten pool after ionization in the shielding gas, and realize the metallurgical control of the welding molten pool.

8. An axially multi-channel protected gas-fed consumable electrode gas shielded welding torch according to claim 1, characterized in that, The relative position between the lateral gas path and the molten pool is adjustable. It is stipulated that the projection angle between the lateral gas path and the welding direction on the welding plane is θ. Taking the example that Ar is introduced into the axial gas path and CO2 is introduced into the lateral gas path, the value of θ can be changed by rotating the nozzle, so that the lateral gas path is placed on one side of the base material Ⅰ, one side of the base material Ⅱ, in front of the molten pool, behind the molten pool or any other position, and the metallurgical control of the molten pool is realized by changing the orientation of the CO2 gas entering the molten pool.

9. An axially multi-channel protected gas-fed consumable electrode gas shielded welding torch according to claim 1, characterized in that, Both the axial gas path and the lateral gas path are controlled by electromagnetic gas valves. After the gas supply command is given, the axial gas path and the lateral gas path will supply gas according to the given gas flow rate. When welding is completed, the gas supply ends. The entire gas supply process is timed and quantified, and is safe and controllable.

10. The axial multi-channel protected gas-fed consumable electrode gas shielded welding torch according to claim 1, characterized in that, By designing and optimizing the structure of the welding torch, one or more additional shielding gases are added externally without changing the original integrated welding equipment, with low cost, flexibility, and high executability.

11. An axonometric multi-channel protected gas-fed flux-cored arc welding method, characterized in that, It includes the following steps: Step 1: Before conducting the MIG welding test, the plates to be welded should be carefully cleaned and firmly clamped on the working platform first; Step 2: Determine the position where the active gas wants to be introduced, or determine the position where the protection area wants to be enlarged, and adjust θ by rotating the nozzle to change the relative position between the lateral gas path and the part to be welded. If you want to introduce the active gas near a certain side of the base material, or increase the protection area on a certain side, then rotate the lateral gas path above this type of plate; if you want to introduce the active gas in multiple directions at the same time, or enlarge the protection areas at multiple positions, then multiple copper tubes can be used, that is, the axial and lateral multi-path shielding gas feeding mode; Step 3: Connect the gas path, open the shielding gas cylinder, check whether the gas remaining in the shielding gas cylinder is sufficient. If the air pressure is too low, the cylinder needs to be replaced. Manually supply gas to ensure that there is no foreign object blocking inside the gas path, and set the gas flow rate required for the two gas paths respectively; Step 4: Check the wire feeding channel to ensure that the wire feeding pipeline is unobstructed without foreign object blocking, and set the wire dry elongation between 10 - 20 mm; Step 5: Set process parameters such as welding current, voltage, wire feeding speed, etc. through the teaching panel of the welding machine, and set the welding speed; Step 6: Locate the starting and ending points of welding. To ensure the protection effect of the welding area, set the gas supply for 5 - 30 s before arc starting, start the welding program, and begin gas metal arc welding. Step 7: After welding is completed, stop supplying the shielding gas. After the workpiece cools down, clean the weld surface with a wire brush, remove the clamping parts on the working platform, and take off the workpiece to complete the welding.

Images