Welding additive device

Abstract

The present invention provides a welding additive device, which relates to the field of additive manufacturing technology. The device includes a first wire feeding mechanism, a second wire feeding mechanism, an AC power supply, a first diode, a second diode and a pulsating wire feeding mechanism; the pulsating wire feeding mechanism is installed on the first wire feeding mechanism, and the pulsating wire feeding mechanism is electrically connected to the first wire feeding mechanism and the AC power supply respectively, and the pulsating wire feeding mechanism is used to adjust the wire feeding rate of the first wire feeding mechanism according to the current direction of the first wire feeding mechanism; wherein, at the same time, only one of the first circuit and the second circuit is conductive. The welding additive device provided by the present invention, by setting a pulsating wire feeding mechanism, adjusts the wire feeding rate of the first wire feeding mechanism to the first welding wire according to the current direction of the first wire feeding mechanism, so that the wire feeding rate of the first welding wire is adapted to the melting rate, thereby improving the arc voltage and arc stability of the welding additive device, and helping to improve the efficiency of welding additives.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a welding additive manufacturing device. Background Art

[0002] Additive manufacturing technology is a technology that slices three-dimensional models into layers and continuously adds material layer by layer to generate three-dimensional solids. Its advantages of low material loss, free design and manufacture of parts with complex geometries, and near-net forming have attracted widespread attention and developed rapidly.

[0003] In the multi-electrode variable polarity alternating arc welding additive technology, a main welding gun and a slave welding gun are set up, and the arc is alternately generated by polarity conversion of the variable polarity current. The heat transfer, force transfer and mass transfer of the arc are decoupled by the alternating arc, thereby improving the welding and additive quality.

[0004] However, due to the polarity alternation of the main welding gun, the voltage drop when the main welding gun acts as an anode and the voltage drop when it acts as a cathode are quite different, resulting in inconsistent melting efficiency of the welding wire in the main welding gun during the current polarity conversion process, affecting the arc voltage and arc stability during welding or additive manufacturing, which is not conducive to improving welding or additive manufacturing efficiency. Summary of the Invention

[0005] The present invention provides a welding additive device, which is used to solve the technical problems of arc voltage and arc instability during the alternating polarity conversion process of a variable polarity current in the prior art.

[0006] The present invention provides a welding additive device, comprising:

[0007] a first wire feeding mechanism, equipped with a first welding wire;

[0008] a second wire feeding mechanism, equipped with a second welding wire;

[0009] an AC power supply, electrically connected to the workpiece to be processed, the first wire feeding mechanism, and the second wire feeding mechanism respectively;

[0010] a first diode installed between the workpiece to be processed and the AC power supply, wherein the first diode is conductive from the workpiece to be processed to the AC power supply, and the AC power supply, the first wire feeding mechanism, the workpiece to be processed, and the first diode form a first circuit;

[0011] a second diode installed between the first wire feeding mechanism and the second wire feeding mechanism, wherein the second diode is conductive from the AC power supply to the second wire feeding mechanism, and the AC power supply, the second diode, the second wire feeding mechanism, and the first wire feeding mechanism form a second circuit;

[0012] a pulsating wire feeding mechanism, mounted on the first wire feeding mechanism, the pulsating wire feeding mechanism being electrically connected to the first wire feeding mechanism and the AC power supply, respectively, and configured to adjust the wire feeding rate of the first wire feeding mechanism according to the current direction of the first wire feeding mechanism;

[0013] Wherein, only one of the first loop and the second loop is turned on at the same time.

[0014] According to a welding additive device provided by the present invention, the second wire feeding mechanism and the workpiece to be processed are connected in parallel to one pole of the AC power supply, and the first wire feeding mechanism is connected to the other pole of the AC power supply.

[0015] According to a welding additive device provided by the present invention, in the first circuit, the first wire feeding mechanism is an anode, and the workpiece to be processed is a cathode;

[0016] In the second loop, the second wire feeding mechanism is an anode and the first wire feeding mechanism is a cathode.

[0017] According to a welding additive device provided by the present invention, when the current direction of the first wire feeding mechanism is from the AC power supply to the first wire feeding mechanism, the pulsating wire feeding mechanism controls the wire feeding rate to be a first rate;

[0018] When the current direction of the first wire feeding mechanism is from the first wire feeding mechanism to the AC power supply, the pulsating wire feeding mechanism controls the wire feeding rate to be a second rate;

[0019] The first rate is smaller than the second rate.

[0020] According to a welding additive device provided by the present invention, the ratio of the first rate to the second rate is 1:2.5 to 1:3.

[0021] According to a welding additive device provided by the present invention, the welding additive device further includes a first contact mechanism and a second contact mechanism;

[0022] The first wire feeding mechanism is provided with a first wire guide nozzle, the first welding wire is movably inserted into the first wire guide nozzle, one end of the first contact mechanism is connected to the first wire guide nozzle, and the other end has a first contact point, the first welding wire and the first contact point are in sliding electrical contact;

[0023] The second wire feeding mechanism is provided with a second wire guide nozzle, the second welding wire can be movably inserted into the second wire guide nozzle, one end of the second contact mechanism is connected to the second wire guide nozzle, and the other end has a second contact, and the second welding wire can be in sliding electrical contact with the second contact.

[0024] According to a welding additive device provided by the present invention, the first contact mechanism and the second contact mechanism are both arc-shaped.

[0025] According to a welding additive device provided by the present invention, the first contact mechanism and the second contact mechanism are copper electrodes.

[0026] According to a welding additive device provided by the present invention, the first wire feeding mechanism and the second wire feeding mechanism are arranged at an angle so that the extension line of the first welding wire and the extension line of the second welding wire intersect and the intersection is located relatively close to the workpiece to be processed.

[0027] According to a welding additive device provided by the present invention, the central axis of the first wire feeding mechanism is perpendicular to the surface of the workpiece to be processed.

[0028] The welding additive device provided by the present invention electrically connects an AC power supply to a workpiece to be processed, a first wire feeding mechanism and a second wire feeding mechanism, respectively, and sets a first diode and a second diode to form a first circuit and a second circuit. Through the cutoff effect of the first diode and the second diode and the polarity conversion of the AC power supply, the first circuit and the second circuit alternately generate arcs, thereby improving the cladding efficiency; by setting a pulsating wire feeding mechanism, the wire feeding rate of the first wire feeding mechanism to the first welding wire is adjusted according to the current direction of the first wire feeding mechanism, so that the wire feeding rate of the first welding wire is adapted to the melting rate, thereby improving the arc voltage and arc stability of the welding additive device, and helping to improve the welding additive efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural schematic diagram of the welding additive device provided by the present invention.

[0031] Reference numerals:

[0032] 10: First wire feeding mechanism; 11: First wire guide nozzle; 12: First welding wire; 13: First contact mechanism; 20: Second wire feeding mechanism; 21: Second wire guide nozzle; 22: Second welding wire; 23: Second contact mechanism; 30: AC power supply; 40: First diode; 50: Second diode; 60: Pulsating wire feeding mechanism; 70: First circuit; 71: Arc a; 80: Second circuit; 81: Arc b; 90: Workpiece to be processed. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "inside", "outside", "axial", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 cannot be understood as a limitation on the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] In the present invention, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] like Figure 1 As shown, the welding additive device provided by the present invention includes a first wire feeding mechanism 10, a second wire feeding mechanism 20, an AC power supply 30, a first diode 40, a second diode 50 and a pulsating wire feeding mechanism 60.

[0038] The first wire feeding mechanism 10 is equipped with a first welding wire 12. The first welding wire 12 is movably inserted into the first wire feeding mechanism 10 and is electrically connected to the first wire feeding mechanism 10. The first wire feeding mechanism 10 can drive the first welding wire 12 to extend outward to achieve welding or material addition. The first welding wire 12 is coaxially arranged with the first wire feeding mechanism 10.

[0039] The second wire feeding mechanism 20 is equipped with a second welding wire 22. The second welding wire 22 is movably inserted into the second wire feeding mechanism 20 and is electrically connected to the second wire feeding mechanism 20. The second wire feeding mechanism 20 can drive the second welding wire 22 to extend outward to achieve welding or material addition. The second welding wire 22 and the second wire feeding mechanism 20 are coaxially arranged.

[0040] The first welding wire 12 and the second welding wire 22 may be made of the same material or different materials.

[0041] For example, when the first welding wire 12 and the second welding wire 22 are made of the same material, it helps to improve the filling efficiency and the cladding rate, reduce the heat input of the workpiece 90 to be processed, ensure the welding additive efficiency, and reduce stress concentration.

[0042] For example, when the first welding wire 12 and the second welding wire 22 are made of different materials, in-situ alloying can be completed. By artificially changing the relative cladding rates of the first welding wire 12 and the second welding wire 22, they can be combined into different composition ratios to achieve welding or additive manufacturing of functional materials, gradient materials or high-strength and high-toughness materials.

[0043] The AC power supply 30 is electrically connected to the workpiece 90, the first wire feeding mechanism 10 and the second wire feeding mechanism 20. The AC power supply 30 can be a sine wave, a square wave, a high-level polarity-changing square wave, etc.

[0044] The first diode 40 is installed between the workpiece 90 to be processed and the AC power supply 30. The conduction direction of the first diode 40 is from the workpiece 90 to the AC power supply 30. The AC power supply 30, the first wire feeding mechanism 10, the workpiece 90 to be processed and the first diode 40 form a first circuit 70.

[0045] The second diode 50 is installed between the first wire feeding mechanism 10 and the second wire feeding mechanism 20. The conduction direction of the second diode 50 is from the AC power supply 30 to the second wire feeding mechanism 20. The AC power supply 30, the second diode 50, the second wire feeding mechanism 20 and the first wire feeding mechanism 10 form a second circuit 80.

[0046] The pulsating wire feeding mechanism 60 is installed on the first wire feeding mechanism 10. The pulsating wire feeding mechanism 60 is electrically connected to the first wire feeding mechanism 10 and the AC power supply 30 respectively. The pulsating wire feeding mechanism 60 is used to adjust the wire feeding rate of the first wire feeding mechanism 10 according to the current direction of the first wire feeding mechanism 10.

[0047] At the same time, only one of the first loop 70 and the second loop 80 is conductive.

[0048] In the first circuit 70, the AC power supply 30, the first wire feeder 10, the workpiece 90, and the first diode 40 are connected in series. The first diode 40 has a unidirectional conduction characteristic. When the first diode 40 is cut off, the current in the first circuit 70 flows from the AC power supply 30 to the first wire feeder 10 to the workpiece 90 and then to the first diode 40. An arc a71 is generated between the first welding wire 12 and the workpiece 90, thereby welding or adding material to the surface of the workpiece 90.

[0049] In the second circuit 80, the AC power supply 30, the second diode 50, the second wire feeder 20, and the first wire feeder 10 are connected in series. The second diode 50 has a unidirectional conduction characteristic. When the second diode 50 is cut off, the current in the second circuit 80 flows from the AC power supply 30 to the second diode 50, then to the second wire feeder 20, and finally to the first wire feeder 10. An arc b81 is generated between the first welding wire 12 and the second welding wire 22, thereby welding or adding material to the surface of the workpiece 90.

[0050] Under the cutoff effect of the first diode 40 and the second diode 50, as the polarity of the AC power supply 30 changes, the current is forced to be split. At the same time, only one of the first circuit 70 and the second circuit 80 is turned on, that is, only one arc exists at the same time. The first circuit 70 and the second circuit 80 alternately generate arcs, thereby increasing the cladding rate.

[0051] The pulsating wire feeding mechanism 60 can obtain the positive and negative current conditions of the first wire feeding mechanism 10, thereby determining the current direction of the first wire feeding mechanism 10, and adjusting the wire feeding rate according to the current direction, so that the melting rate of the first welding wire 12 is adapted to the wire feeding rate, thereby ensuring the arc voltage and arc stability of the welding additive device.

[0052] For example, the pulsating wire feeding mechanism 60 may have a built-in calculation model or comparison table to adjust the wire feeding rate based on the current direction.

[0053] The welding additive device provided in an embodiment of the present invention electrically connects an AC power supply 30 to a workpiece 90 to be processed, a first wire feeding mechanism 10, and a second wire feeding mechanism 20, respectively, and sets a first diode 40 and a second diode 50 to form a first circuit 70 and a second circuit 80. Through the cutoff effect of the first diode 40 and the second diode 50 and the polarity conversion of the AC power supply 30, the first circuit 70 and the second circuit 80 alternately generate arcs, thereby improving the cladding efficiency; by setting a pulsating wire feeding mechanism 60, the wire feeding rate of the first wire feeding mechanism 10 to the first welding wire 12 is adjusted according to the current direction of the first wire feeding mechanism 10, so that the wire feeding rate of the first welding wire 12 is adapted to the melting rate, thereby improving the arc voltage and arc stability of the welding additive device, and helping to improve the welding additive efficiency.

[0054] Furthermore, the second wire feeding mechanism 20 and the workpiece 90 to be processed are connected in parallel to one pole of the AC power supply 30 , and the first wire feeding mechanism 10 is connected to the other pole of the AC power supply 30 .

[0055] Exemplarily, the second wire feeding mechanism 20 and the workpiece 90 to be processed are respectively electrically connected to the cathode of the AC power supply 30 , and the first wire feeding mechanism 10 is electrically connected to the anode of the AC power supply 30 .

[0056] Specifically, in the first circuit 70, the first wire feeder 10 serves as the anode, and the workpiece 90 serves as the cathode. When the AC power source 30 is connected to a positive connection, the first circuit 70 is conductive, and a conventional additive welding process is performed. The cathode spot cleans and breaks up the oxide film surrounding the molten pool of the workpiece 90, releasing hydrogen and reducing the likelihood of pores forming during solidification.

[0057] In the second circuit 80, the second wire feeder 20 is the anode, and the first wire feeder 10 is the cathode. When the AC power source is reversed, the second circuit 80 is conductive, and both electrodes of the arc b81 are the welding wires. Heat generated by the anode is primarily used to melt the welding wire, helping to improve energy utilization and increase the cladding rate.

[0058] Further, when the current direction of the first wire feeding mechanism 10 is from the AC power supply 30 to the first wire feeding mechanism 10 , the pulsating wire feeding mechanism 60 controls the wire feeding rate to be the first rate.

[0059] In the case that the current direction of the first wire feeding mechanism 10 is from the first wire feeding mechanism 10 to the AC power supply 30 , the pulsating wire feeding mechanism 60 controls the wire feeding rate to be the second rate.

[0060] The first rate is smaller than the second rate.

[0061] The first rate and the second rate are both pre-set parameters. The pulsating wire feeding mechanism 60 can obtain the positive and negative current of the first wire feeding mechanism 10 to determine the current direction of the first wire feeding mechanism 10, and thus control the wire feeding rate to the first rate or the second rate according to the current direction to ensure arc voltage and arc stability.

[0062] Specifically, when the first circuit 70 is turned on, the current direction of the first wire feeding mechanism 10 is from the AC power supply 30 to the first wire feeding mechanism 10, and the first wire feeding mechanism 10 is the anode. At this time, the voltage drop of the first wire feeding mechanism 10 is small. By controlling the wire feeding rate to a smaller first rate, the melting rate of the first welding wire 12 is adapted to the wire feeding rate.

[0063] When the second circuit 80 is turned on, the current direction of the first wire feeding mechanism 10 is from the first wire feeding mechanism 10 to the AC power supply 30, and the first wire feeding mechanism 10 is the cathode. At this time, the voltage drop of the first wire feeding mechanism 10 is large. By controlling the wire feeding rate to a larger second rate, the melting rate of the first welding wire 12 is adapted to the wire feeding rate.

[0064] Preferably, the ratio of the first rate to the second rate is 1:2.5 to 1:3.

[0065] Furthermore, if Figure 1 As shown, the additive welding device further includes a first contact mechanism 13 and a second contact mechanism 23 .

[0066] A first wire nozzle 11 is provided in the first wire feeding mechanism 10, and a first welding wire 12 can be movably inserted into the first wire nozzle 11. One end of the first contact mechanism 13 is connected to the first wire nozzle 11, and the other end has a first contact point. The first welding wire can be in sliding electrical contact with the first contact point.

[0067] The second wire feeding mechanism 20 is provided with a second wire nozzle 21, and the second welding wire 22 can be movably inserted into the second wire nozzle 21. One end of the second contact mechanism 23 is connected to the second wire nozzle 21, and the other end has a second contact point. The second welding wire 22 can slide and electrically contact with the second contact point.

[0068] The first wire nozzle 11 is installed in the inner cavity of the first wire feeding mechanism 10, and the first welding wire 12 is arranged in the inner cavity of the first wire nozzle 11, and the first welding wire 12 can extend outward relative to the first wire nozzle 11. One end of the first contact mechanism 13 is fixed on the first wire nozzle 11, and the other end is in electrical contact with the outer wall surface of the first welding wire 12. Since the spatial position of the first contact point of the first contact mechanism 13 remains fixed, as the first welding wire 12 moves axially along the first wire nozzle 11, the contact point between the first welding wire 12 and the first contact mechanism 13 is always where the first contact point is located, so as to ensure the stability of the dry extension pressure drop and length, and ensure the stability and dynamic thermal balance during the welding additive process. The principle of the connection relationship between the second welding wire 22 and the second contact mechanism 23 is the same as the above description, and will not be repeated here.

[0069] In conventional conductive nozzles, the welding material and the nozzle cavity have a gap fit, resulting in a long conductive path between the welding material and the nozzle. As the welding material extends outward, the electrical contact point between the welding material's outer surface and the nozzle may change, resulting in unstable electrical connection between the two and affecting arc stability. In this embodiment, by providing a first contact mechanism 13 and a second contact mechanism 23, the spatial position of the contact point between the welding material and the wire guide nozzle remains unchanged. Even if the welding wire moves axially, the contact point of the first contact mechanism 13 or the second contact mechanism 23 can always maintain electrical contact with the outer wall surface of the welding wire, greatly improving the stability of the welding additive process.

[0070] Furthermore, the first contact mechanism 13 and the second contact mechanism 23 are both arc-shaped.

[0071] like Figure 1 As shown, one end of the first contact mechanism 13 is fixed to the first wire nozzle 11, and the other end is bent toward the first welding wire 12; one end of the second contact mechanism 23 is fixed to the second wire nozzle 21, and the other end is bent toward the second welding wire 22. Preferably, the shape of the first contact point or the second contact point matches the shape of the outer wall of the first welding wire 12 or the second welding wire 22, so that the first contact mechanism 13 and the first welding wire 12, and the second contact mechanism 23 and the second welding wire 22 are tightly attached.

[0072] Arranging the first contact mechanism 13 and the second contact mechanism 23 to be arc-shaped helps to save materials and reduce production costs.

[0073] In a specific embodiment, the first contact mechanism 13 and the second contact mechanism 23 are copper electrodes, and the first contact mechanism 13 or the second contact mechanism 23 is fixed to the first wire guide nozzle 11 or the second wire guide nozzle 21 by brazing.

[0074] like Figure 1 As shown, the first wire feeding mechanism 10 and the second wire feeding mechanism 20 are arranged at an angle so that the extension line of the first welding wire 12 and the extension line of the second welding wire 22 intersect and the intersection is located relatively close to the workpiece 90 to be processed. When the second circuit 80 is turned on, it is conducive to the generation of an arc b81 between the first welding wire 12 and the second welding wire 22.

[0075] Furthermore, the central axis of the first wire feeding mechanism 10 is perpendicular to the surface of the workpiece 90 to be processed, and the central axis of the second wire feeding mechanism 20 is inclined to the surface of the workpiece 90 to be processed.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A welding additive device, characterized in that: include: a first wire feeding mechanism, equipped with a first welding wire; a second wire feeding mechanism, equipped with a second welding wire; an AC power supply, electrically connected to the workpiece to be processed, the first wire feeding mechanism, and the second wire feeding mechanism respectively; a first diode installed between the workpiece to be processed and the AC power supply, wherein the first diode is conductive from the workpiece to be processed to the AC power supply, and the AC power supply, the first wire feeding mechanism, the workpiece to be processed, and the first diode form a first circuit; a second diode installed between the first wire feeding mechanism and the second wire feeding mechanism, wherein the second diode is conductive from the AC power supply to the second wire feeding mechanism, and the AC power supply, the second diode, the second wire feeding mechanism, and the first wire feeding mechanism form a second circuit; a pulsating wire feeding mechanism, mounted on the first wire feeding mechanism, the pulsating wire feeding mechanism being electrically connected to the first wire feeding mechanism and the AC power supply, respectively, and configured to adjust the wire feeding rate of the first wire feeding mechanism according to the current direction of the first wire feeding mechanism; Wherein, only one of the first loop and the second loop is turned on at the same time.

2. The welding additive device according to claim 1, characterized in that The second wire feeding mechanism and the workpiece to be processed are connected in parallel to one pole of the AC power supply, and the first wire feeding mechanism is connected to the other pole of the AC power supply.

3. The welding additive device according to claim 2, characterized in that: In the first circuit, the first wire feeding mechanism is an anode and the workpiece to be processed is a cathode; In the second loop, the second wire feeding mechanism is an anode and the first wire feeding mechanism is a cathode.

4. The welding additive device according to claim 1, characterized in that When the current direction of the first wire feeding mechanism is from the AC power supply to the first wire feeding mechanism, the pulsating wire feeding mechanism controls the wire feeding rate to be a first rate; When the current direction of the first wire feeding mechanism is from the first wire feeding mechanism to the AC power supply, the pulsating wire feeding mechanism controls the wire feeding rate to be a second rate; The first rate is smaller than the second rate.

5. The welding additive device according to claim 4, characterized in that: The ratio of the first rate to the second rate is 1:2.5 to 1:

3.

6. The welding additive device according to claim 1, characterized in that The welding additive device further includes a first contact mechanism and a second contact mechanism; The first wire feeding mechanism is provided with a first wire guide nozzle, the first welding wire is movably inserted into the first wire guide nozzle, one end of the first contact mechanism is connected to the first wire guide nozzle, and the other end has a first contact point, the first welding wire and the first contact point are in sliding electrical contact; The second wire feeding mechanism is provided with a second wire guide nozzle, the second welding wire can be movably inserted into the second wire guide nozzle, one end of the second contact mechanism is connected to the second wire guide nozzle, and the other end has a second contact, and the second welding wire can be in sliding electrical contact with the second contact.

7. The welding additive device according to claim 6, characterized in that: The first contact mechanism and the second contact mechanism are both arc-shaped.

8. The welding additive device according to claim 6, characterized in that: The first contact mechanism and the second contact mechanism are copper electrodes.

9. The welding additive device according to claim 1, characterized in that: The first wire feeding mechanism and the second wire feeding mechanism are arranged obliquely so that the extension line of the first welding wire and the extension line of the second welding wire intersect and the intersection point is located relatively close to the workpiece to be processed.

10. The welding additive device according to claim 9, characterized in that: The central axis of the first wire feeding mechanism is perpendicular to the surface of the workpiece to be processed.

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