Welding rod fixing equipment and welding rod fixing method using welding rod fixing equipment

Abstract

The present invention relates to a welding rod fixing apparatus and a welding rod fixing method using the same, the welding rod fixing apparatus comprising a body portion and a coupling portion, the body portion comprising: a first surface having a first hole formed at the center thereof through which a welding rod is allowed to pass; the second surface is provided with a second hole which is formed in a position, corresponding to the first hole, of the center of the second surface and allows the welding rod to pass through; the third surface is connected with the first surface and the second surface; a space portion in which a portion of an outer peripheral surface formed by the third surface is open, the space portion being formed such that a hollow portion is formed from the portion of the outer peripheral surface to a central portion where the first hole and the second hole are connected; and a fourth surface configured to form a spatial portion into which the coupling portion is insertable and arranged to apply pressure to the welding rod passing through the first hole and the second hole.

Description

Technical Field

[0001] This application claims the benefit of priority to Korean Patent Application No. 2023-0170627, filed on November 30, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present invention relates to a welding rod fixing device and a welding rod fixing method using the same, and more particularly to a welding rod fixing device for vertically fixing a welding rod and a welding rod fixing method using the same. Background Art

[0003] With the technological development of mobile devices and the increasing demand for mobile devices, secondary batteries that can be charged and discharged have been used as an energy source for various mobile devices. Secondary batteries have also attracted attention as an energy source for electric vehicles and hybrid electric vehicles, which are proposed as alternatives to existing gasoline and diesel vehicles that use fossil fuels.

[0004] According to the shape of the battery case, secondary batteries are classified into: cylindrical batteries having an electrode assembly mounted in a cylindrical metal can, prismatic batteries having an electrode assembly mounted in a prismatic metal can, and pouch-type batteries having an electrode assembly mounted in a pouch-type case made of aluminum laminated sheets.

[0005] Meanwhile, in the case of a cylindrical secondary battery, a negative electrode tab is resistance-welded to the can, and thus the can serves as a negative terminal. As described above, when the negative electrode tab is resistance-welded to the can, if the welding angle is incorrect, a splash phenomenon may occur, in which molten metal particles are scattered around the welding area, which may result in a low voltage.

[0006] Figure 1 is a view illustrating a state in which a welding rod is fixed to a conventional welding rod fixing device.

[0007] Refer to Figure 1 , a conventional welding rod fixing device 20 fixes a welding rod 10 by inserting the welding rod between two blocks 21 and 22 and coupling the two blocks 21 and 22 to each other.

[0008] However, there is a problem in that steps are easily formed between the upper and lower surfaces of the two blocks 21 and 22, and thus, the welding surfaces of the workpiece and the welding rod 10 are not perpendicular, resulting in a reduced contact area and a splash phenomenon due to excessive melting caused by increased heat generation.

[0009] (Prior Art Documents)

[0010] (Patent Document 1) Korean Patent Application Publication No. 10-2023-0053831 Summary of the Invention

[0011] Technical Problem

[0012] The present invention is made in view of the above problems, and an object of the present invention is a welding rod fixing device and a welding rod fixing method using the welding rod fixing device. The welding rod fixing device is used to fix a welding rod so that the welding surfaces of a workpiece and the welding rod are perpendicular and there are no steps between the upper surface and the lower surface.

[0013] Technical Solution

[0014] As a technical means for achieving the above object, the welding rod fixing device according to an embodiment of the present invention includes a main body part 100 and a coupling part 200. The main body part includes: a first surface 110 having a first hole 111 formed at its center for the welding rod 10 to extend therethrough; a second surface 120 having a second hole 121 formed at its center for the welding rod 10 to extend therethrough, the second hole being formed at a position corresponding to the first hole 111; a third surface 130 configured to connect the first surface 110 and the second surface 120 to each other; a space part 150 formed due to a part of the outer peripheral surface formed by the third surface 130 being open, the space part being formed such that a hollow part is formed from a part of the outer peripheral surface to a central part where the first hole 111 and the second hole 121 are connected to each other; and a fourth surface 140 configured to form the space part 150 into which the coupling part can be inserted, the coupling part being configured to press the welding rod 10 extending through the first hole 111 and the second hole 121.

[0015] In addition, in the welding rod fixing device according to an embodiment of the present invention, the coupling part 200 may contact the fourth surface 140 after being inserted into the space part 150, and the coupling part is configured to press the welding rod 10 together with the fourth surface 140.

[0016] In addition, in the welding rod fixing device according to an embodiment of the present invention, the main body part 100 may be provided with a first recess 141 corresponding to the shape of a part of the welding rod 10 in the fourth surface 140 that contacts the coupling part 200, and the coupling part 200 may be provided with a second recess 210 corresponding to the shape of a part of the welding rod 10 in one surface that contacts the fourth surface 140.

[0017] In addition, the welding rod fixing device according to an embodiment of the present invention may further include a fastening member 300 that is coupled to the main body part 100 after the coupling part 200 is inserted into the space part 150.

[0018] In addition, in the welding rod fixing device according to an embodiment of the present invention, the fourth surface 140 may be provided with a fastening recess 142 into which a fastening member 300 is inserted, and the coupling part 200 may include a fastening hole 220 into which the fastening member 300 is inserted, and the fastening hole is formed at a position corresponding to the fastening recess 142.

[0019] In addition, in the welding rod fixing device according to an embodiment of the present invention, the fastening member 300 may be provided with male threads on its outer surface, the fastening member is configured to extend through both the fastening recess 142 and the fastening hole 220 at the same time, and each of the fastening recess 142 and the fastening hole 220 may be provided with female threads, and the fastening member 300, the fastening recess 142, and the fastening hole 220 are threadedly coupled to each other.

[0020] In addition, in the welding rod fixing device according to an embodiment of the present invention, the fastening recess 142 may be formed to face the space part 150, the fastening recesses are provided in plurality and are arranged in a state where a first recess 141 is disposed between the fastening recesses so as not to interfere with the first recess 141, and the fastening holes 220 may be formed to pass through one surface and the other surface of the coupling part 200, the fastening holes are provided in plurality and are arranged in a state where a second recess 210 is disposed between the fastening holes so as not to interfere with the second recess 210.

[0021] In addition, in the welding rod fixing device according to an embodiment of the present invention, a central portion of the fourth surface 140 may be recessed toward the third surface 130, and one surface of the coupling part 200 may be configured as a curved surface corresponding to the shape of the central portion of the fourth surface 140 so as to engage with the central portion of the fourth surface 140.

[0022] In addition, in the welding rod fixing device according to an embodiment of the present invention, the other surface of the coupling part 200 may be located inside the space part 150, and the other surface is flat.

[0023] In addition, in the welding rod fixing device according to an embodiment of the present invention, the central portion of the fourth surface 140 may be flat, and one surface of the coupling part 200 may be configured as a flat surface corresponding to the shape of the central portion of the fourth surface 140 so as to engage with the central portion of the fourth surface 140.

[0024] In addition, in the welding rod fixing device according to an embodiment of the present invention, the other surface of the coupling part 200 may protrude outward.

[0025] In addition, the method for fixing a welding rod using a welding rod fixing device according to an embodiment of the present invention includes: a step (S1) of inserting the welding rod 10 to simultaneously extend through the first hole 111 and the second hole 121; a step (S2) of inserting the coupling part 200 into the space part 150; and a step (S3) of inserting the fastening member 300 into the fastening recess 142 and the fastening hole 220 to fix the fastening member.

[0026] Furthermore, in the method for fixing a welding rod according to an embodiment of the present invention, in step (S2),

[0027] the coupling part 200 may press a portion of the welding rod 10 disposed in the first recess 141 through the second recess 210.

[0028] Advantageous Effects

[0029] As is obvious from the above description, in the welding rod fixing device according to the present invention and the method for fixing a welding rod using the welding rod fixing device, the body part formed as a single piece is provided with a first hole and a second hole on its first surface and second surface respectively, the welding rod extends through the first hole and the second hole, and the coupling part is inserted into the body part and fixed to the body part, whereby the welding rod can be held in a vertical state.

[0030] Furthermore, in the welding rod fixing device according to the present invention and the method for fixing a welding rod using the welding rod fixing device, the body part is provided with a first recess in which a portion of the welding rod is received, and the coupling part is also provided with a second recess in which a portion of the welding rod is received, whereby the welding rod is always held in a vertical state without being distorted, and thus welding defects can be minimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a view illustrating a state in which a welding rod is fixed to a conventional welding rod fixing device.

[0032] Figure 2 is a perspective view illustrating a state in which a welding rod is fixed to a welding rod fixing device according to a first embodiment of the present invention.

[0033] Figure 3 is Figure 2 a cross-sectional view of the welding rod fixing device shown in taken along the XZ plane.

[0034] Figure 4 is Figure 2 a cross-sectional view of the welding rod fixing device shown in taken along the XY plane.

[0035] Figure 5This is a perspective view showing the main body portion of a welding rod fixing device according to a first embodiment of the present invention.

[0036] Figure 6 This is a perspective view showing the connecting portion of a welding rod fixing device according to a first embodiment of the present invention.

[0037] Figure 7 This is a perspective view showing the state in which a welding rod is fixed to a welding rod fixing device according to a second embodiment of the present invention.

[0038] Figure 8 is Figure 7 a cross-sectional view taken along the XZ plane of the welding rod fixing device shown in

[0039] Figure 9 is Figure 7 a cross-sectional view taken along the XY plane of the welding rod fixing device shown in

[0040] Figure 10 This is a perspective view showing the main body portion of a welding rod fixing device according to a second embodiment of the present invention.

[0041] Figure 11 This is a perspective view showing the connecting portion of a welding rod fixing device according to a second embodiment of the present invention. Detailed Embodiments

[0042] Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that the preferred embodiments of the present invention can be easily implemented by those of ordinary skill in the art to which the present invention pertains. However, when describing the operating principles of the preferred embodiments of the present invention in detail, the detailed descriptions of the known functions and configurations incorporated herein may obscure the subject matter of the present invention, and thus the detailed descriptions of these functions and configurations will be omitted.

[0043] In addition, throughout the drawings, the same reference numerals will be used to refer to parts that perform similar functions or operations. Throughout the specification, when a part is referred to as being connected to another part, this part may not only be directly connected to the other part, but this part may also be indirectly connected to the other part via another part. In addition, including a certain element does not mean excluding other elements, but rather means that such elements may be further included, unless otherwise mentioned.

[0044] Hereinafter, a welding rod fixing device according to the present invention will be described.

[0045] Figure 2 This is a perspective view showing the state in which a welding rod is fixed to a welding rod fixing device according to a first embodiment of the present invention, Figure 3 is Figure 2A cross-sectional view of the welding rod fixing device shown in [reference] taken along the XZ plane, and Figure 4 is Figure 2 a cross-sectional view of the welding rod fixing device shown in [reference] taken along the XY plane. Figure 5 is a perspective view showing the body part of the welding rod fixing device according to the first embodiment of the present invention, and Figure 6 is a perspective view showing the coupling part of the welding rod fixing device according to the first embodiment of the present invention.

[0046] Referring to Figures 2 to 6 , the welding rod fixing device according to the first embodiment of the present invention includes a body part 100, a coupling part 200, and a fastening member 300.

[0047] The body part 100 includes a first surface 110, a second surface 120, a third surface 130, a fourth surface 140, and a space part 150. For example, the body part 100 may be in the form of a cylindrical block, in which a part of its outer peripheral surface is open to provide the space part 150.

[0048] However, the body part 100 is not limited thereto, and may be in the form of a hexahedron, in which a part of its outer peripheral surface is open to provide the space part 150. For example, the body part 100 may be constructed as a member having a first surface 110, a second surface 120, and an outer peripheral surface configured to have the space part 150.

[0049] More specifically, the first surface 110 may be the upper surface of the body part 100 ( Figure 2 the 12 o'clock position in [reference]), the second surface 120 may be the lower surface of the body part 100 ( Figure 2 the 6 o'clock position in [reference]), and the third surface 130 may be the outer peripheral surface of the body part 100. In addition, the fourth surface 140 may be a surface formed due to a part of the outer peripheral surface formed by the third surface 130 being open.

[0050] The first surface 110 of the body part 100 may be provided with a first hole 111 at the center of the first surface 110 for the welding rod 10 to extend therethrough. In addition, the second surface 120 of the body part may be provided with a second hole 121 at the center of the second surface 120 for the welding rod 10 to extend therethrough, and the second hole is formed at a position corresponding to the first hole 111.

[0051] Here, the fact that the second hole 121 is formed at a position corresponding to the first hole 111 means that the second hole 121 is Figure 2 on the same Z-axis line as the first hole 111 in [reference].

[0052] In addition, for example, it may be preferable that the size of each of the first hole 111 and the second hole 121 corresponds to the cross-sectional size of the welding rod 10 such that the welding rod 10 can extend through each of the first hole 111 and the second hole 121, or, taking into account construction errors, manufacturing errors, etc., the size of each of the first hole 111 and the second hole 121 is set to be larger than the cross-sectional size of the welding rod 10. That is to say, each of the first hole 111 and the second hole 121 can be formed such that the welding rod 10 can be inserted through each of the first hole 111 and the second hole 121 without interference.

[0053] The third surface 130 may be an outer peripheral surface connecting the first surface 110 and the second surface 120 to each other, and the space portion 150 may be formed due to a part of the outer peripheral surface formed by the third surface 130 being open, and the space portion 150 may be formed such that a hollow portion is formed from a part of the outer peripheral surface to the central portion where the first hole 111 and the second hole 121 are connected to each other.

[0054] The fourth surface 140 is a surface forming the space portion 150 and may be formed to connect from the open portion of the outer peripheral surface formed by the third surface 130 to the central portion where the first hole 111 and the second hole 121 are connected to each other. Therefore, the space portion 150 may be formed by the first surface 110, the second surface 120, and the fourth surface 140.

[0055] The fourth surface 140 of the main body portion 100 may be provided with a first recess 141 corresponding to the shape of a part of the welding rod 10. For example, the first recess 141 may be formed such that a part of the welding rod 10 that has extended through the first hole 111 and the second hole 121, that is, a part of the welding rod 10 located between the first hole 111 and the second hole 121, is received (seated) in the first recess 141.

[0056] In addition, the fourth surface 140 may be configured such that the surface forming the first recess 141 - where the first hole 111 and the second hole 121 are connected to each other - is recessed toward the third surface 130. More specifically, referring to Figure 4 , the fourth surface 140 may be configured such that the central portion of the fourth surface 140 forming the first recess 141 is a curved surface recessed toward the third surface 130 while having an approximately "U" shape.

[0057] Referring again to Figures 2 to 6 , the coupling portion 200 may be inserted into the space portion 150 of the main body portion 100 and may be configured to press the welding rod 10 extending through the first hole 111 and the second hole 121.

[0058] The coupling part 200 may have a shape corresponding to that of the space part 150 so as to be inserted into the space part 150. In other words, the coupling part 200 may be configured to have the same shape as the space part 150 formed by the fourth surface 140.

[0059] Preferably, the size of the coupling part 200 corresponds to the cross-sectional size of the space part 150 such that the coupling part can be inserted into the space part 150, or, taking into account construction errors, manufacturing errors, etc., the size of the coupling part 200 is smaller than the cross-sectional size of the space part 150. That is to say, the size of the coupling part 200 can be set such that the coupling part can be inserted into the space part 150 without interfering with the body part 100 when inserted into the space part.

[0060] The coupling part 200 may contact the fourth surface 140 after being inserted into the space part 150 and may be configured to press the welding rod 10 together with the fourth surface 140. For example, after the coupling part 200 is inserted into the space part 150, three peripheral surfaces of the coupling part 200 may contact the fourth surface 140.

[0061] In addition, the coupling part 200 may be provided with a second recess 210 on one surface thereof that contacts the fourth surface 140 and has a shape corresponding to a part of the welding rod 10. For example, the second recess 210 may be formed such that a part of the welding rod 10 that has extended through the first hole 111 and the second hole 121, that is, a part of the welding rod 10 located between the first hole 111 and the second hole 121, is received (seated) in the second recess 210. The second recess 210 may press the welding rod 10 together with the first recess 110.

[0062] One surface of the coupling part 200 that contacts the central part of the fourth surface 140 ( Figure 6 the 2 o'clock position in) may be bent to correspond to the shape of the central part of the fourth surface 140 such that the surface of the coupling part engages with the central part of the fourth surface 140. In other words, one surface of the coupling part 200 may be convex.

[0063] In addition, the other surface of the coupling part 200 ( Figure 6 the 8 o'clock position in) may be located inside the space part 150 and may be flat. In other words, with reference to Figure 2 and Figure 6 , the other surface of the coupling part 200 may be configured as a flat surface located inside the space part 150 such that a part of each of the first surface 110 and the second surface 120 is in a protruding state after the coupling part 200 is inserted into the space part 150.

[0064] Meanwhile, after the connecting part 200 is inserted into the space part 150, the fastening member 300 can be coupled to the body part 100. In other words, the body part 100 and the connecting part 200 can be coupled to each other by the fastening member 300.

[0065] More specifically, a fastening recess 142 may be provided on the fourth surface 140 of the body part 100, and the fastening member 300 is inserted into the fastening recess 142. In addition, the fastening recess 142 may be formed toward the space part 150 and may be provided in plurality, with the first recess 141 disposed between the fastening recesses 142 so as not to interfere with the first recess 141. For example, two fastening recesses 142 may be formed, with the first recess 141 disposed between the two fastening recesses 142, and in another example, four fastening recesses may be formed, with the first recess 141 disposed between the four fastening recesses.

[0066] In addition, the connecting part 200 may have a fastening hole 220 into which the fastening member 300 is inserted, and the fastening hole 220 is formed at a position corresponding to the fastening recess 142. In addition, the fastening hole 220 may be formed to penetrate one surface and the other surface of the connecting part 200 and may be provided in plurality, with the second recess 210 disposed between the fastening holes 220 so as not to interfere with the second recess 210. For example, two fastening holes 220 may be formed, with the second recess 210 disposed between the two fastening holes 220, and in another example, four fastening holes may be formed, with the second recess 210 disposed between the four fastening holes.

[0067] The fastening recess 142 and the fastening hole 220 are formed to be on the same straight line (i.e., the X axis in Figure 2 ), and are preferably formed in an equal number.

[0068] In addition, each of the fastening recess 142 and the fastening hole 220 may be provided with an internal thread, and the outer surface of the fastening member 300 may be provided with an external thread formed to engage with the internal thread. For example, the fastening member 300 may be provided as a screw member having an external thread formed on its outer surface.

[0069] The fastening member 300 may extend through the fastening hole 220 and the fastening recess 142 at the same time, and the fastening member 300 may be threadedly coupled to the fastening hole 20 and the fastening recess 142.

[0070] Therefore, the fastening member 300 can fix the connecting part 200 and the body part 100 to be coupled to each other.

[0071] Figure 7is a perspective view showing a state in which a welding rod is fixed to a welding rod fixing device according to a second embodiment of the present invention, Figure 8 is Figure 7 a cross-sectional view of the welding rod fixing device shown in Figure 9 taken along the XZ plane, and Figure 7 is Figure 10 a cross-sectional view of the welding rod fixing device shown in Figure 11 taken along the XY plane.

[0072] Referring to Figures 7 to 11 , the welding rod fixing device according to the second embodiment of the present invention is the same as the welding rod fixing device according to the above-described first embodiment except for some configurations, and thus the following description will be given based on the different configurations.

[0073] The central portion of the fourth surface 140 constituting the body portion 100 of the welding rod fixing device according to the second embodiment may be flat, and a part of the side surface forming the space portion 150 may be cut. Referring to Figure 9 , the fourth surface 140 may be configured to form a substantially rectangular shape that is open on one side.

[0074] In addition, one surface of the coupling portion 200 that contacts the central portion of the fourth surface 140 may be configured as a flat surface corresponding to the shape of the central portion of the fourth surface 140 to engage with the central portion of the fourth surface 140.

[0075] In addition, the other surface of the coupling portion 200 may protrude outward. In other words, referring to Figure 7 and Figure 11 , the other surface of the coupling portion 200 may be configured as a curved surface having a curvature corresponding to a part of each of the first surface 110 and the second surface 120.

[0076] In addition, the coupling portion 200 may be inserted into the space portion 150, and the other surface of the coupling portion 200 may be located at or near the same distance perpendicular to the edges of the first surface 110 and the second surface 120.

[0077] At this time, since the front portion of the opposite side portion of the fourth surface 140 corresponds to the empty space portion 150, a part of each of the opposite side portions of the coupling portion 200 is exposed. Therefore, when the coupling portion 200 is coupled to or detached from the body portion 100, a part of the exposed opposite side portion can be used as a handle that can be grasped by an operator.

[0078] Next, reference will be made to Figures 2 to 6 describe a welding rod fixing method using a welding rod fixing device according to a first embodiment of the present invention.

[0079] The welding rod fixing method according to the present invention includes: a step (S1) of inserting a welding rod 10 to simultaneously extend through a first hole 111 and a second hole 121; a step (S2) of inserting a coupling portion 200 into a space portion 150; and a step (S3) of inserting a fastening member 300 into a fastening recess 142 and a fastening hole 220 to fix the fastening member.

[0080] In step (S2), the coupling portion 200 may press a portion of the welding rod 10 disposed in the first recess 141 through the second recess 210.

[0081] As described above, in the welding rod fixing device according to the first embodiment of the present invention and the welding rod fixing method using the welding rod fixing device, the welding rod 10 can be fixed by the following method: in a state where the welding rod 10 has extended through the first hole 111 and the second hole 121, the coupling portion 200 is inserted into the space portion 150 to press the welding rod 10.

[0082] Although the welding rod fixing device according to the first embodiment has been described by way of example, the welding rod fixing device according to the second embodiment can fix the welding rod in the same manner.

[0083] Although the specific details of the present invention have been described in detail, those skilled in the art will understand that the detailed description of the present invention only discloses the preferred embodiments of the present invention and thus does not limit the scope of the present invention. Therefore, those skilled in the art will understand that various changes and modifications are possible without departing from the scope and technical concept of the present invention, and it will be apparent that such changes and modifications fall within the scope of the appended claims.

[0084] (List of reference numerals)

[0085] 10: Welding rod

[0086] 100: Body portion

[0087] 110: First surface 111: First hole

[0088] 120: Second surface 121: Second hole

[0089] 130: Third surface

[0090] 140: Fourth surface

[0091] 141: First recess 142: Fastening recess

[0092] 150: Space part

[0093] 200: Connecting part

[0094] 210: Second recess 220: Fastening hole

[0095] 300: Fastening member

Claims

1. A welding rod fixing device, characterized in that, Comprising: A body part, the body part comprising: a first surface having a first hole formed at the center of the first surface for a welding rod to extend therethrough; a second surface having a second hole formed at the center of the second surface for the welding rod to extend therethrough, the second hole being formed at a position corresponding to the first hole; a third surface configured to connect the first surface and the second surface to each other; a space part formed due to a part of the outer peripheral surface formed by the third surface being open, the space part being formed such that a hollow part is formed from a part of the outer peripheral surface to a central part where the first hole and the second hole are connected to each other; and a fourth surface configured to form the space part; and A coupling part capable of being inserted into the space part, the coupling part being configured to press the welding rod extending through the first hole and the second hole.

2. The welding rod fixing device according to claim 1, wherein after being inserted into the space part, the coupling part contacts the fourth surface, and the coupling part is configured to press the welding rod together with the fourth surface.

3. The welding rod fixing device according to claim 2, wherein the body part is provided with a first recess in the fourth surface of the body part that contacts the coupling part, the first recess corresponding to the shape of a part of the welding rod, and the coupling part is provided with a second recess in a surface of the coupling part that contacts the fourth surface, the second recess corresponding to the shape of a part of the welding rod.

4. The welding rod fixing device according to claim 1, characterized in that, It further includes a fastening member that is coupled to the body part after the coupling part is inserted into the space part.

5. The welding rod fixing device according to claim 4, wherein the fourth surface is provided with a fastening recess, the fastening member is inserted into the fastening recess, and the coupling part includes a fastening hole, the fastening member is inserted into the fastening hole, and the fastening hole is formed at a position corresponding to the fastening recess.

6. The welding rod fixing device according to claim 5, wherein the fastening member is provided with a male thread on the outer surface thereof, the fastening member is configured to extend through the fastening recess and the fastening hole simultaneously, and each of the fastening recess and the fastening hole is provided with a female thread, and the fastening member, the fastening recess, and the fastening hole are threadedly coupled to each other.

7. The welding rod fixing device according to claim 5, wherein the fastening recess is formed to face the space part, the fastening recesses are provided in plurality, and are arranged in a state where the first recesses are disposed between the fastening recesses to avoid interference with the first recesses, and the fastening holes are formed to pass through one surface and the other surface of the coupling part, the fastening holes are provided in plurality, and are arranged in a state where the second recesses are disposed between the fastening holes to avoid interference with the second recesses.

8. The welding rod fixing device according to claim 2, wherein a central portion of the fourth surface is recessed toward the third surface, and one surface of the connecting portion is configured as a curved surface corresponding to the shape of the central portion of the fourth surface to engage with the central portion of the fourth surface.

9. The welding rod fixing device according to claim 8, wherein the other surface of the connecting portion is located inside the space portion, and the other surface is flat.

10. The welding rod fixing device according to claim 2, wherein the central portion of the fourth surface is flat, and one surface of the connecting portion is configured as a flat surface corresponding to the shape of the central portion of the fourth surface to engage with the central portion of the fourth surface.

11. The welding rod fixing device according to claim 10, wherein the other surface of the connecting portion protrudes outward.

12. A method for fixing a welding rod using the welding rod fixing device according to any one of claims 1 to 11, characterized in that, The method includes: a step (S1) of inserting a welding rod (10) to simultaneously extend through the first hole and the second hole; a step (S2) of inserting the connecting portion into the space portion; and a step (S3) of inserting a fastening member into the fastening recess and the fastening hole to fix the fastening member.

13. The welding rod fixing device according to claim 12, wherein in step (S2), the connecting portion presses a portion of the welding rod disposed in the first recess through the second recess.

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