Welding device using electromagnetic field

Abstract

The present invention relates to a welding device using an electromagnetic field, and the invention may include: a welding torch unit that receives a wire from a wire supply unit, forms a tip, and performs welding by being positioned between two base materials; a copper immersion unit that is movable together with the welding torch unit and prevents the molten pool from flowing down; and a magnetic field unit provided in the copper immersion unit, forms a magnetic field, and determines the direction of an arc using Lorentz force. The present invention allows for easy narrow-gap welding by separating the electromagnet and the cooling water circulation pipe from the welding torch and using a welding torch with a reduced volume. It also allows for the application of conventional EGW (Electro Gas Welding) welding by installing the electromagnet separated from the welding torch in a copper plate used for conventional EGW welding and cooling it using the cooling water circulation pipe of the copper plate. Furthermore, by embedding the electromagnet in a copper plate equipped with a water cooling system to maintain a constant temperature, magnetic field loss of the magnet can be prevented.

Description

Technology Field

[0001] The present invention relates to a welding device, and more specifically, to a welding device using an electromagnetic field. Background Technology

[0003] Generally, due to the low heat input and small molten pool characteristic of narrow gap welding, lack of fusion on the side of the narrow gap is a common defect in Gas Metal Arc (GMA) narrow gap welding. Therefore, electrode weaving is required to improve welding quality and increase productivity. Through this electrode weaving, sufficient penetration occurs on the side of the joint, allowing for reliable joint quality to be obtained.

[0004] Commonly developed weaving methods include the mechanical movement of the welding torch, plastic deformation of consumable electrodes, and arc oscillation using electromagnetic force.

[0005] In the case of mechanical feed, the welding tip must be moved across the groove to move the arc; however, this method is rarely used because it is not very effective due to the small gap between the welding tip and the side.

[0006] The method of supplying a consumable electrode by plastically deforming it involves plastically deforming the electrode wire wound on a roll from side to side to create a weaving effect when feeding the electrode wire. This technique has the advantage of being applicable to narrow grooves because the welding tip does not move, but it has the disadvantages that the weight of the torch mechanism itself increases and the degree of plastic deformation of the wire cannot be precisely controlled.

[0007] Arc oscillation using electromagnetic force has a small weight of the mechanism itself and can control the degree of weaving, but has a limit to the gap width due to the thickness of the tip itself.

[0008] While narrow-gap welding is advantageous as the gap width becomes as narrow as possible, the reduced fluidity of the molten pool within the narrow gap makes it easy to obtain uneven bead surfaces or convex bead shapes, which significantly affect subsequent welds. To minimize these defects, a relatively recently developed method involves controlling the arc generation location—that is, the arc heat input—by evenly distributing it within the gap using a pulsed current waveform. Compared to the previously mentioned method, this approach has the advantage of being applicable to ultra-narrow gap welding; however, it is difficult to apply to gap widths of 5 mm or more, and a programmable pulse welder is mandatory. Additionally, there are issues such as the difficulty in controlling the phase of the current waveform.

[0009] FIGS. 1 and 2 show registered patent No. 10-0421424 (published on March 9, 2024, hereinafter referred to as Patent Document 1), and Patent Document 1 discloses a narrow gap welding torch equipped with an electromagnet that applies a magnetic field to a welding arc using the narrow gap welding torch equipped with an electromagnet, thereby deflecting the welding arc in a direction perpendicular to the direction of the magnetic field.

[0010] Since an electromagnet device is provided on the exterior of the welding torch of Patent Document 1 and a cooling water circulation pipe is included in the main body of the welding torch, it is inevitable that the volume of the welding torch increases. For example, as shown in FIG. 3, when welding a narrow gap, there is a problem in that the welding torch interferes with the base material, making it difficult to reach the lower side of the welding area. Prior art literature

[0012] (Patent Document 0001) KR 10-0421424 B1 The problem to be solved

[0013] The present invention aims to solve the aforementioned conventional problems. The objective of the present invention is to provide a welding device utilizing an electromagnetic field that reduces the volume of the welding torch by separating the electromagnet and the cooling water circulation pipe from the welding torch, thereby overcoming the phenomenon in which narrow-gap welding or weaving at any angle between the welding torch and the base material becomes impossible due to the inevitably increased volume resulting from the addition of components such as an electromagnet and a cooling water circulation pipe to the welding torch.

[0014] Another objective of the present invention is to provide a welding device using an electromagnetic field that can be applied not only to conventional EGW welding but also to arc welding such as FCAW (Flux Cored Arc Welding) and GMAW (Gas Metal Arc Welding) by installing an electromagnet separated from the welding torch in a copper plate used for conventional EGW (Electro Gas Welding) welding and cooling it using a cooling water circulation pipe of the copper plate.

[0015] Another objective of the present invention is to provide a welding device using an electromagnetic field that prevents magnetic field loss of the magnet by embedding an electromagnet in a copper plate equipped with a water cooling system to maintain a constant temperature. means of solving the problem

[0017] To achieve the objectives of the present invention as described above, a welding device using an electromagnetic field according to one embodiment of the present invention may include: a welding torch unit that receives a wire from a wire supply unit, forms a tip, and performs welding by being positioned between two base materials; a copper immersion unit that is movable together with the welding torch unit and prevents the molten pool from flowing down; and a magnetic field unit provided in the copper immersion unit, forms a magnetic field, and determines the direction of the arc using the Lorentz force.

[0018] A welding device using an electromagnetic field according to one embodiment of the present invention may further include a first power supply unit electrically connected to the welding torch unit and the base material to supply power.

[0019] In a welding device using an electromagnetic field according to one embodiment of the present invention, an iron core;

[0020] It may further include a coil wound around the iron core; and a second power supply unit that supplies direct or alternating current to the coil.

[0021] In a welding device using an electromagnetic field according to one embodiment of the present invention, a direct current or alternating current may be applied from the second power supply to deflect the arc direction.

[0022] In a welding device using an electromagnetic field according to one embodiment of the present invention, a direct current or alternating current may be applied from the second power supply to oscillate the welding torch unit.

[0023] In a welding device using an electromagnetic field according to an embodiment of the present invention, the second power supply unit can selectively change the direction of the current supplied to the electromagnet unit so that the direction of the magnetic field formed in the electromagnet unit is reversed.

[0024] In a welding device using an electromagnetic field according to an embodiment of the present invention, the second power supply unit changes the magnitude of the alternating current to have an amplitude of a predetermined size according to the user's intention, and the strength of the magnetic field changes through the alternating current with the changed magnitude, thereby determining the degree of weaving.

[0025] In a welding device using an electromagnetic field according to one embodiment of the present invention, the magnetic field unit may include a pair of magnets with opposite poles facing the welding area or the molten pool.

[0026] In a welding device using an electromagnetic field according to one embodiment of the present invention, the pair of magnets can be rotated to change the polarity toward the welding area or the molten pool.

[0027] In a welding device using an electromagnetic field according to one embodiment of the present invention, the distance between the pair of magnets can be selectively varied. Effects of the invention

[0029] The present invention separates the electromagnet and the cooling water circulation pipe from the welding torch, and allows for easy welding of narrow gaps through a welding torch of reduced volume.

[0030] In addition, the present invention can be applied not only to conventional EGW welding but also to arc welding such as FCAW (Flux Cored Arc Welding) and GMAW (Gas Metal Arc Welding) by installing an electromagnet separated from the welding torch in a copper wick used in conventional EGW (Electro Gas Welding) welding and cooling it using a cooling water circulation pipe of the copper wick.

[0031] In addition, the present invention can prevent magnetic field loss of the magnet by embedding an electromagnet in a copper plate equipped with a water cooling system to maintain a constant temperature. Brief explanation of the drawing

[0033] FIG. 1 is a perspective view showing the usage state of a welding torch with a conventional electromagnet attached. Figure 2 is a side cross-sectional view at AA of Figure 1. Figure 3(a) is a schematic side view illustrating the use and application of a conventional welding torch equipped with an electromagnet. Figure 3(b) is a front view schematically showing the use and application of a conventional welding torch equipped with an electromagnet. FIG. 4(a) is a conceptual diagram of a welding device using an electromagnetic field according to an embodiment of the present invention. Figure 4(b) is a conceptual diagram showing the arrangement of the welding torch and base material of Figure 4(a) from the side. FIG. 5(a) is a front view schematically showing a copper compress in a welding device using an electromagnetic field according to an embodiment of the present invention. Figure 5(b) is a left side view of Figure 5(a). Figure 5(c) is a bottom view of Figure 5(a). Figures 6 (a) and (b) are conceptual diagrams showing an example of the deflection of the arc welding portion of a welding torch according to the direction of the current and magnetic field in a welding device using an electromagnetic field according to an embodiment of the present invention. Figures 7 (a) and (b) are conceptual diagrams showing a state in which no magnetic field is generated in a welding device using an electromagnetic field according to an embodiment of the present invention. Figures 8 (a) and (b) are conceptual diagrams showing an example of deflection of an arc welding portion according to the direction of the current and magnetic field in a welding device using an electromagnetic field according to an embodiment of the present invention. Figures 9 (a) and (b) are conceptual diagrams showing a state in which a permanent magnet is used instead of an electromagnet in a welding device using an electromagnetic field according to an embodiment of the present invention. Specific details for implementing the invention

[0034] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0035] Additionally, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by these terms. Where it is stated that a component is “connected,” “combined,” or “joined” to another component, it should be understood that the component may be directly connected or joined to the other component, but that another component may also be “connected,” “combined,” or “joined” between each component.

[0037] Hereinafter, a welding device using an electromagnetic field according to an embodiment of the present invention will be described with reference to the attached drawings.

[0038] FIG. 4(a) is a conceptual diagram of a welding device using an electromagnetic field according to an embodiment of the present invention, and FIG. 4(b) is a conceptual diagram showing the arrangement of the welding torch and base material of FIG. 4(a) from the side.

[0039] Referring to FIG. 4(a) and (b), a welding device using an electromagnetic field according to an embodiment of the present invention may include a welding torch unit (100), a copper quenching unit (200), and a magnetic field unit (300). FIG. 4(a) illustrates that the welding torch unit (100) moves to the right in the drawing to form a molten pool (P), and as the molten pool (P) cools, a bead (B) is formed.

[0040] A welding torch unit (100) may include a torch body (110), a tip (120), a wire supply unit (130), and a first power supply unit (140). The welding torch unit (100) may receive a wire (131) from the wire supply unit (130) described later to form a tip (120) and perform welding by positioning it between two base materials.

[0041] The torch body (110) may have a length so that it can be grasped by a user or other gripping device. The torch body (110) may receive a wire (131) from a wire supply unit (130) described later on one side.

[0042] The tip (120) is provided on the other side of the torch body (110) and can be formed to converge in a direction away from the other side of the torch body (110). Through the tip (120), the wire (131) inside the torch body (110) can be guided to protrude to the outside of the tip (120).

[0043] The wire supply unit (130) is a device that supplies a wire (131) to a torch body (110), and the wound wire (131) is wound, and the wound wire (131) can be supplied to the torch body (110).

[0044] The first power supply unit (140) can supply power while electrically connecting the torch body (110) and the base material (M). Although the drawing shows the first power supply unit (140) with reverse polarity, where the positive (+) pole is connected to the torch body (110) and the negative (-) pole is connected to the base material (M), this is merely an example, and depending on the user's intention, it may also show positive polarity, where the negative (-) pole is connected to the torch body (110) and the positive (+) pole is connected to the base material (M).

[0045] FIG. 5(a) is a schematic front view of a copper plate in a welding device using an electromagnetic field according to an embodiment of the present invention, FIG. 5(b) is a left side view of FIG. 5(a), and FIG. 5(c) is a bottom view of FIG. 5(a).

[0046] Referring to FIGS. 4 and 5, the copper immersion unit (200) can prevent the molten pool (P) from flowing down. The copper immersion unit (200) can move along the length of the weld line (not shown) together with the welding torch unit (100).

[0047] The copper immersion unit (200) may include a cooling water nipple (210) and a shielding gas nipple (220). That is, the copper immersion unit (200) may have a cooling channel formed in which cooling water flows to cool the molten pool or molten metal that has flowed down, and may receive a shielding gas to protect the molten pool or molten metal and spray it onto the welding area.

[0048] Referring again to FIG. 4, a magnetic field unit (300) may be provided in a copper immersion unit (200). The magnetic field unit (300) forms a magnetic field and can determine the direction of the tip using the Lorentz force. The magnetic field unit (300) may include an iron core (311), a coil, and a second power supply unit (320).

[0049] The magnetic field unit (300) has a coil (312) wound around an iron core (311) and is installed in the copper quenching unit (200), and both ends of the coil (312) can be electrically connected to a second power supply unit (320). The second power supply unit (320) can be provided outside the copper quenching unit (200) and can supply direct or alternating current to the coil (312). Although the magnetic field unit (300) is shown in the drawing with the coil on the side closer to the welding area connected to the negative (-) pole and the coil on the side relatively farther from the welding area connected to the positive (+) pole, the magnetic field unit (300) is intended to generate a magnetic field, and the positive (+) pole and negative (-) pole can be varied according to the user's selection, thereby changing the direction of the magnetic field. The electromagnet, composed of an iron core (311) and a coil (312), can prevent magnetic field loss through the cooling channel of the copper immersion unit (200).

[0050] When a direct current or alternating current is applied from the second power supply unit (320), the arc generated from the wire (131) exposed from the tip (120) can be deflected, and the welding torch unit (100) can be oscillated along the deflected direction of the arc.

[0051] The second power supply unit (320) can selectively change the direction of the current supplied to the electromagnet (310) so that the direction of the magnetic field formed in the electromagnet (310) is reversed.

[0052] The second power supply unit (320) changes the magnitude of the alternating current to have a predetermined amplitude according to the user's intention, and the strength of the magnetic field changes through the alternating current with the changed magnitude, and the degree of weaving can be determined.

[0053] FIGS. 6(a) and (b) are conceptual diagrams illustrating an example of the deflection of the arc welding portion of a welding torch according to the direction of the current and magnetic field in a welding device using an electromagnetic field according to an embodiment of the present invention, FIGS. 7(a) and (b) are conceptual diagrams illustrating a state in which no magnetic field is generated in a welding device using an electromagnetic field according to an embodiment of the present invention, and FIGS. 8(a) and (b) are conceptual diagrams illustrating an example of the deflection of the arc welding portion according to the direction of the current and magnetic field in a welding device using an electromagnetic field according to an embodiment of the present invention. In FIGS. 6(b), FIGS. 7(b), and FIGS. 8(b), the welding torch unit (100) is assumed to be moved to the right in the drawings. Additionally, when a person is looking at the drawings, “⊙” indicates the direction in which the current or magnetic field emerges from the drawings, and “ " indicates the direction in which the current or magnetic field enters.

[0054] When looking at the drawing in Fig. 6, the magnetic field formed in the magnetic field unit (300) is formed to the right and in the direction where the current of the welding torch unit (100) comes out, and the Lorentz force acts upward, and the arc can also be deflected upward by the Lorentz force.

[0055] Figure 7 shows that the arc is not deflected when no magnetic field is generated.

[0056] When looking at the drawing in Fig. 8, the magnetic field formed in the magnetic field unit (300) is formed to the left and in the direction where the current of the welding torch unit (100) comes out, and the Lorentz force acts downward, and the arc can also be deflected downward by the Lorentz force.

[0057] Meanwhile, the electromagnetic field unit (300) may use a permanent magnet in addition to an electromagnet using an iron core (311) and a coil (312).

[0058] Figures 9 (a) and (b) are conceptual diagrams showing a state in which a permanent magnet is used instead of an electromagnet in a welding device using an electromagnetic field according to an embodiment of the present invention.

[0059] Referring to FIG. 9, the electromagnetic field unit (300) includes a magnet (330), and the magnet (330) may be prepared in pairs so that different poles face the welding area or molten pool (P). At this time, the magnetic field may be formed in a direction that comes out from the N pole of the magnet (330) and enters the S pole, and as shown in FIG. 9, the magnetic field may be formed to face downward from the N pole located at the top to the S pole located at the bottom.

[0060] A pair of magnets (330) may both be permanent magnets, and each of the pair of magnets (330) may rotate to change the polarity toward the welding area or molten pool (P). At this time, the magnets (330) may be rotated by a user or by a separate rotating device.

[0061] Additionally, the distance between a pair of magnets (330) can be selectively varied, and the magnetic field corresponding to the position of the welding torch unit (100) facing the welding area or molten pool (P) can be varied in strength and thus fluctuate.

[0063] The above description is merely an example for implementing a welding device using an electromagnetic field according to the present invention. The present invention is not limited to the above-described example, and the technical spirit of the present invention extends to the scope in which any person with ordinary knowledge in the technical field to which the present invention belongs can implement it by making various modifications without departing from the gist of the invention as claimed in the following patent claims. Explanation of the symbols

[0065] 100 : Welding torch unit 110 : Torch body 120 : Tips 130 : Wire supply 131 : Wire 140 : 1st power supply unit 200 : Dongdamgeum unit 210: Coolant nipple 220 : Shielding gas nipple 300 : Magnetic field unit 310 : Electromagnet 311 : Iron core 312 : Coil 320 : Second power supply unit 330 : Magnet M : Base material P : Molten pool B : Bead

Claims

Claim 1 A welding device using an electromagnetic field comprising: a welding torch unit that receives a wire from a wire supply unit, forms a tip, and performs welding by positioning between two base materials; a copper immersion unit that is movable together with the welding torch unit and prevents the molten pool from flowing down; and a magnetic field unit provided in the copper immersion unit, forms a magnetic field, and determines the direction of the arc using the Lorentz force. Claim 2 A welding device using an electromagnetic field according to claim 1, further comprising: a first power supply unit electrically connected to the welding torch unit and the base material to supply power. Claim 3 A welding device using an electromagnetic field according to claim 1, further comprising: an iron core; a coil wound around the iron core; and a second power supply unit that supplies direct or alternating current to the coil. Claim 4 In paragraph 3, a welding device using an electromagnetic field that deflects the arc direction by applying a direct current or alternating current from the second power supply. Claim 5 In paragraph 3, a welding device using an electromagnetic field that oscillates the welding torch unit by applying a direct current or alternating current from the second power supply. Claim 6 In paragraph 3, the welding device using an electromagnetic field, wherein the second power supply unit can selectively change the direction of the current supplied to the electromagnet unit so that the direction of the magnetic field formed in the electromagnet unit is reversed. Claim 7 In paragraph 3, the welding device using an electromagnetic field wherein the second power supply unit changes the magnitude of the alternating current to have a predetermined amplitude according to the user's intention, and the strength of the magnetic field changes through the alternating current with the changed magnitude to determine the degree of weaving. Claim 8 A welding device using an electromagnetic field according to claim 1, wherein the magnetic field unit comprises a pair of magnets with opposite poles facing the welding area or the molten pool. Claim 9 In claim 8, the above pair of magnets is a welding device using an electromagnetic field capable of changing the poles toward the welding area or the molten pool. Claim 10 In claim 8, the above pair of magnets is a welding device using an electromagnetic field in which the mutual spacing is selectively variable.

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