Welding rod fixing device and welding rod fixing method using same

Abstract

The present invention relates to a welding rod fixing device and to a welding rod fixing method using same, the welding rod fixing device comprising: a body part including a first surface which has a first hole formed in the center thereof to allow a welding rod to pass therethrough, a second surface which has a second hole formed in the center thereof at a position corresponding to the first hole to allow the welding rod to pass therethrough, a third surface which connects the first surface and the second surface, a space portion in which a part of an outer circumferential surface formed by the third surface is open and which is formed to form a hollow from the part of the outer circumferential surface to a central portion in which the first hole and the second hole are connected, and a fourth surface which forms the space portion; and a coupling part insertable into the space portion and provided to apply pressure to the welding rod passing through the first hole and the second hole.

Description

Welding rod fixing device and welding rod fixing method using the same

[0001] This application claims the benefit of priority to Korean Patent Application No. 2023-0170627, filed November 30, 2023, the entire contents of which are incorporated herein by reference.

[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.

[0003]

[0004] As technological development and demand for mobile devices increase, rechargeable secondary batteries are increasingly being used as energy sources for a variety of mobile devices. Secondary batteries are also attracting attention as an energy source for electric and hybrid electric vehicles, offering an alternative to conventional gasoline and diesel vehicles that rely on fossil fuels.

[0005] Secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case.

[0006] Meanwhile, in the case of cylindrical secondary batteries, the negative tab is resistance-welded to the can, allowing the can to function as the negative terminal. When the negative tab is resistance-welded to the can, if the welding angle is not appropriate, spatter, a phenomenon in which molten metal particles are scattered around the weld, can occur, potentially leading to low-voltage failures.

[0007] Figure 1 is a drawing for explaining the appearance of a welding rod fixed to a welding rod fixing device according to a conventional technology.

[0008] Referring to FIG. 1, a conventional welding rod fixing device (20) fixes a welding rod (10) by interposing the welding rod (10) between two blocks (21, 22) and joining the two blocks (21, 22).

[0009] However, there is a problem that a step is likely to occur on the upper and lower surfaces of the two blocks (21, 22), and as a result, the welding surface of the welding rod (10) and the workpiece to be welded is not perpendicular, which reduces the contact area, and also causes a spatter phenomenon due to over-melting caused by an increase in heat generation.

[0010]

[0011] (Prior art literature)

[0012] (Patent Document 1) Korean Patent Publication No. 10-2023-0053831

[0013]

[0014] In order to solve the above problems, the purpose is to provide a welding rod fixing device that fixes a welding rod so that the welding surfaces of the welding rod and the workpiece to be welded are perpendicular without causing a step difference between the upper and lower surfaces, and a welding rod fixing method using the same.

[0015]

[0016] As a technical means for achieving the above purpose, a welding rod fixing device according to one embodiment of the present invention comprises a body portion (100) including a first surface (110) having a first hole (111) formed in the center through which a welding rod (10) can pass, a second surface (120) having a second hole (121) formed in the center through which the welding rod (10) can pass and corresponding to the first hole (111), a third surface (130) connecting the first surface (110) and the second surface (120), a space portion (150) formed such that a part of an outer circumferential surface formed by the third surface (130) is open and is hollow from a part of the outer circumferential surface to a center portion where the first hole (111) and the second hole (121) are connected, and a fourth surface (140) forming the space portion (150); And it is characterized by including a connecting portion (200) that can be inserted into the space portion (150) and is provided to pressurize the welding rod (10) passing through the first hole (111) and the second hole (121).

[0017] In addition, in the welding rod fixing device according to one embodiment of the present invention, the connecting portion (200) is inserted into the space portion (150) and is provided to contact the fourth surface (140) and pressurize the welding rod (10) together with the fourth surface (140).

[0018] In addition, in the welding rod fixing device according to one embodiment of the present invention, the body part (100) is characterized in that a first groove (141) corresponding to a part of the shape of the welding rod (10) is formed on a fourth surface (140) that comes into contact with the connecting portion (200), and the connecting portion (200) is characterized in that a second groove (210) corresponding to a part of the shape of the welding rod (10) is formed on one surface that comes into contact with the fourth surface (140).

[0019] In addition, in the welding rod fixing device according to one embodiment of the present invention, it is characterized in that it further includes a fastening member (300) so that the coupling part (200) is coupled with the body part (100) after being inserted into the space part (150).

[0020] In addition, in the welding rod fixing device according to one embodiment of the present invention, the fourth surface (140) is provided with a fastening groove (142) formed so that the fastening member (300) can be inserted, and the connecting portion (200) is characterized in that it includes a fastening hole (220) formed so that the fastening member (300) can be inserted at a position corresponding to the fastening groove (142).

[0021] In addition, in the welding rod fixing device according to one embodiment of the present invention, the fastening member (300) is provided with a male thread formed on the outer surface and capable of passing through the fastening groove (142) and the fastening hole (220) at the same time, and female threads are formed in the fastening groove (142) and the fastening hole (220), so that the fastening member (300), the fastening groove (142) and the fastening hole (220) are characterized in that they are connected by a screw-joining method.

[0022] In addition, in the welding rod fixing device according to one embodiment of the present invention, the fastening groove (142) is formed toward the space (150), and is formed in multiple numbers with the first groove (141) in between so as not to interfere with the first groove (141), and the fastening hole (220) is formed so as to cross the one surface and the other surface of the joining portion (200), and is formed in multiple numbers with the second groove (210) in between so as not to interfere with the second groove (210).

[0023] In addition, in the welding rod fixing device according to one embodiment of the present invention, the central portion of the fourth surface (140) is provided as a concave curved surface toward the third surface (130), and the one surface of the coupling portion (200) is provided as a curved surface corresponding to the shape of the central portion of the fourth surface (140) so as to be engaged with the central portion of the fourth surface (140).

[0024] In addition, in the welding rod fixing device according to one embodiment of the present invention, the other surface of the connecting portion (200) is located on the inside of the space portion (150) and is characterized by being provided in a flat surface.

[0025] In addition, in the welding rod fixing device according to one embodiment of the present invention, the central portion of the fourth surface (140) is provided as a flat surface, and the one surface of the coupling portion (200) is provided as a flat surface corresponding to the shape of the central portion of the fourth surface (140) so as to be engaged with the central portion of the fourth surface (140).

[0026] In addition, in the welding rod fixing device according to one embodiment of the present invention, the other surface of the connecting portion (200) is characterized by being provided with an outwardly convex curved surface.

[0027] In addition, a method for fixing a welding rod using a welding rod fixing device according to one embodiment of the present invention is characterized by including: (S1) a step of inserting the welding rod (10) so as to pass through the first hole (111) and the second hole (121) simultaneously; (S2) a step of inserting the coupling part (200) into the space (150); and (S3) a step of inserting and fixing the fastening member (300) into the fastening groove (142) and the fastening hole (220).

[0028] In addition, in the welding rod fixing method according to one embodiment of the present invention, in the step (S2),

[0029] The above-mentioned joint (200) is characterized in that it pressurizes a part of the welding rod (10) placed in the first groove (141) through the second groove (210).

[0030]

[0031] As described above, according to the welding rod fixing device and the welding rod fixing method using the same according to the present invention, a first hole and a second hole are formed on the first surface and the second surface of the body part formed as an integral body so that the welding rod can pass through, respectively, and the connecting portion is structured such that the body part is inserted and fixed, so that it is possible to maintain the welding rod in a vertical state.

[0032] In addition, according to the welding rod fixing device and the welding rod fixing method using the same according to the present invention, a first groove is provided in the body portion to accommodate a portion of the welding rod, and a second groove is also provided in the joint portion to accommodate a portion of the welding rod, so that the welding rod is not twisted and is always maintained in a vertical state, thereby minimizing welding defects.

[0033]

[0034] Figure 1 is a drawing for explaining the appearance of a welding rod fixed to a welding rod fixing device according to a conventional technology.

[0035] FIG. 2 is a perspective view illustrating a state in which a welding rod is fixed to a welding rod fixing device according to the first embodiment of the present invention.

[0036] Fig. 3 is a cross-sectional view of the welding rod fixing device shown in Fig. 2 taken along the XZ plane.

[0037] Fig. 4 is a cross-sectional view of the welding rod fixing device shown in Fig. 2 taken along the XY plane.

[0038] Fig. 5 is a perspective view for explaining the body portion of a welding rod fixing device according to the first embodiment of the present invention.

[0039] Fig. 6 is a perspective view for explaining a joint portion of a welding rod fixing device according to the first embodiment of the present invention.

[0040] Fig. 7 is a perspective view illustrating a state in which a welding rod is fixed to a welding rod fixing device according to a second embodiment of the present invention.

[0041] Fig. 8 is a cross-sectional view of the welding rod fixing device shown in Fig. 7 taken along the XZ plane.

[0042] Fig. 9 is a cross-sectional view of the welding rod fixing device shown in Fig. 7 taken along the XY plane.

[0043] Fig. 10 is a perspective view for explaining the body part of a welding rod fixing device according to the second embodiment of the present invention.

[0044] Fig. 11 is a perspective view for explaining a joint portion of a welding rod fixing device according to a second embodiment of the present invention.

[0045]

[0046] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those skilled in the art can easily implement the present invention. However, when describing the operating principles of preferred embodiments of the present invention in detail, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0047] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0048]

[0049] Below, a welding rod fixing device according to the present invention is described.

[0050] FIG. 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, FIG. 3 is a cross-sectional view of the welding rod fixing device illustrated in FIG. 2 taken along the xz plane, and FIG. 4 is a cross-sectional view of the welding rod fixing device illustrated in FIG. 2 taken along the xy plane. In addition, FIG. 5 is a perspective view illustrating a body portion of the welding rod fixing device according to the first embodiment of the present invention, and FIG. 6 is a perspective view illustrating a joint portion of the welding rod fixing device according to the first embodiment of the present invention.

[0051] Referring to FIGS. 2 to 6, a welding rod fixing device according to a first embodiment of the present invention includes a body portion (100), a coupling portion (200), and a fastening member (300).

[0052] The body portion (100) is composed of a first surface (110), a second surface (120), a third surface (130), a fourth surface (140), and a space portion (150). For example, the body portion (100) may be in the form of a cylindrical block, but a portion of the outer circumferential surface may be opened to provide a space portion (150).

[0053] However, the body portion (100) is not limited thereto, and may be provided in a form in which a portion of the outer peripheral surface is opened to provide a space portion (150) while having a hexahedral shape. For example, the body portion (100) may be provided as a member having a first surface (110), a second surface (120), and an outer peripheral surface and having a space portion (150).

[0054] To explain in more detail, the first surface (110) may be the upper surface (12 o'clock direction as shown in FIG. 2) of the body portion (100), the second surface (120) may be the lower surface (6 o'clock direction as shown in FIG. 2) of the body portion (100), and the third surface (130) may be the outer peripheral surface of the body portion (100). In addition, the fourth surface (140) may be a surface formed by opening a portion of the outer peripheral surface formed by the third surface (130).

[0055] A first hole (111) may be formed in the center of the first surface (110) of the body portion (100) so that a welding rod (10) may pass through it. In addition, a second hole (121) may be formed in the center of the second surface (120) so that a welding rod (10) may pass through it and at a position corresponding to the first hole (111).

[0056] Here, the fact that the second hole (121) is formed at a position corresponding to the first hole (111) means that, based on Fig. 2, the second hole (121) is formed on the same Z-axis as the first hole (111).

[0057] In addition, for example, the first hole (111) and the second hole (121) may be preferably set to correspond to the cross-sectional size of the welding rod (10) so that the welding rod (10) can pass through, or to be larger than the cross-sectional size of the welding rod (10) in consideration of construction errors, manufacturing errors, etc. That is, the first hole (111) and the second hole (121) may be formed to be set to a size so that the welding rod (10) can be inserted without interference.

[0058] The third surface (130) may be an outer peripheral surface connecting the first surface (110) and the second surface (120), and the space portion (150) may be formed such that a part of the outer peripheral surface formed by the third surface (130) is open, and a hollow space extends from a part of the outer peripheral surface to a central portion where the first hole (111) and the second hole (121) are connected.

[0059] And the fourth surface (140) is a surface that forms a space portion (150), and can be formed by connecting from an open portion of the outer peripheral surface formed by the third surface (130) to a central portion where the first hole (111) and the second hole (121) are connected. Accordingly, the space portion (150) can be formed by the first surface (110), the second surface (120), and the fourth surface (140).

[0060] A first groove (141) corresponding to a portion of the shape of the welding rod (10) may be formed on the fourth surface (140) of the body portion (100). For example, the first groove (141) may be formed so that a portion of the welding rod (10) that has passed through the first hole (111) and the second hole (121), i.e., a portion of the welding rod (10) located between the first hole (111) and the second hole (121) is received (seated).

[0061] In addition, the fourth surface (140) may be provided such that the surface where the first groove (141) connecting the first hole (111) and the second hole (121) is formed has a concave curved surface toward the third surface (130). Referring to Fig. 4, more specifically, the fourth surface (140) may be provided such that the central portion of the fourth surface (140) where the first groove (141) is formed has a concave curved surface toward the third surface (130), and forms approximately a 'U' shape.

[0062] Referring again to FIGS. 2 to 6, the connecting portion (200) can be inserted into the space portion (150) of the body portion (100) and can be provided to pressurize the welding rod (10) passing through the first hole (111) and the second hole (121).

[0063] The connecting portion (200) may be provided with a shape corresponding to the shape of the space portion (150) so that it can be inserted into the space portion (150). In other words, the connecting portion (200) may be provided to have the same shape as the space portion (150) formed by the fourth surface (140).

[0064] It may be desirable for the connecting portion (200) to be set to correspond to the size of the cross-section of the space portion (150) so that it can be inserted into the space portion (150), or to be set to be smaller than the size of the cross-section of the space portion (150) in consideration of construction errors, manufacturing errors, etc. That is, the connecting portion (200) may be formed to be set to a size that can be inserted without interference from the body portion (100) when inserted into the space portion (150).

[0065] The connecting portion (200) may be inserted into the space portion (150) and may be provided to contact the fourth surface (140) and pressurize the welding rod (10) together with the fourth surface (140). For example, the connecting portion (200) may be inserted into the space portion (150) and three of the peripheral surfaces may be in contact with the fourth surface (140).

[0066] In addition, a second groove (210) corresponding to a shape of a portion of the welding rod (10) may be formed on one surface of the joint (200) that is in contact with the fourth surface (140). For example, the second groove (210) may be formed so that a portion of the welding rod (10) that has passed through the first hole (111) and the second hole (121), i.e., a portion of the welding rod (10) located between the first hole (111) and the second hole (121) is received (seated). This second groove (210) may pressurize the welding rod (10) together with the first groove (110).

[0067] The connecting portion (200) may be provided with a curved surface corresponding to the shape of the central portion of the fourth surface (140) so that one surface (2 o'clock direction based on FIG. 6) that is in contact with the central portion of the fourth surface (140) is engaged with the central portion of the fourth surface (140). In other words, one surface of the connecting portion (200) may be provided to have a convex curved surface.

[0068] In addition, the other surface (8 o'clock direction based on FIG. 6) of the connecting portion (200) may be provided as a flat surface located on the inside of the space portion (150). In other words, referring to FIGS. 2 and 6, the other surface of the connecting portion (200) may be provided as a flat surface located on the inside of the space portion (150) so that after the connecting portion (200) is inserted into the space portion (150), a portion of the first surface (110) and the second surface (120) protrudes.

[0069] Meanwhile, the fastening member (300) may be provided so that the body part (100) is coupled with the coupling part (200) after it is inserted into the space part (150). In other words, the coupling of the body part (100) and the coupling part (200) may be achieved by the fastening member (300).

[0070] To explain in more detail, a fastening groove (142) may be formed on the fourth surface (140) of the body portion (100) so that a fastening member (300) can be inserted therein. In addition, the fastening grooves (142) may be formed toward the space portion (150), but may be formed in multiple numbers with the first groove (141) interposed therebetween so as not to interfere with the first groove (141). For example, two fastening grooves (142) may be formed with the first groove (141) interposed therebetween, but as another example, four fastening grooves (142) may be formed with the first groove (141) interposed therebetween.

[0071] In addition, a fastening hole (220) may be formed in the coupling portion (200) so that a fastening member (300) can be inserted at a position corresponding to the fastening groove (142). In addition, the fastening holes (220) may be formed to cross one side and the other side of the coupling portion (200), but may be formed in multiple numbers with the second groove (210) interposed therebetween so as not to interfere with the second groove (210). For example, two fastening holes (220) may be formed with the second groove (210) interposed therebetween, but as another example, four fastening holes (220) may be formed with the second groove (210) interposed therebetween.

[0072] The fastening groove (142) and the fastening hole (220) are formed to be located on the same line (i.e., the X-axis line based on FIG. 2), and it is preferable that they are formed in the same number.

[0073] In addition, female threads are formed in the fastening groove (142) and the fastening hole (220), and male threads are formed on the outer surface of the fastening member (300) so that they can be coupled to each other. For example, the fastening member (300) can be provided as a screw member with male threads formed on the outer surface.

[0074] The fastening member (300) can be connected to the fastening hole (20) and the fastening groove (142) by a screw connection method by passing through the fastening hole (220) and the fastening groove (142) at the same time.

[0075] Accordingly, the fastening member (300) can fix the joining portion (200) and the body portion (100) so that they are joined to each other.

[0076]

[0077] Fig. 7 is a perspective view for explaining a state in which a welding rod is fixed to a welding rod fixing device according to a second embodiment, Fig. 8 is a cross-sectional view of the welding rod fixing device illustrated in Fig. 7 taken along the XZ plane, and Fig. 9 is a cross-sectional view of the welding rod fixing device illustrated in Fig. 7 taken along the XY plane. In addition, Fig. 10 is a perspective view for explaining a body portion of a welding rod fixing device according to a second embodiment, and Fig. 11 is a perspective view for explaining a joint portion of a welding rod fixing device according to a second embodiment.

[0078] Referring to FIGS. 7 to 11, the welding rod fixing device according to the second embodiment of the present invention is identical to the welding rod fixing device according to the first embodiment described above except for some configurations, and therefore, the following description will focus on the different configurations.

[0079] The fourth surface (140) of the body portion (100) constituting the welding rod fixing device according to the second embodiment may be provided with a central portion that is flat, and a portion of the side surface forming the space portion (150) may be provided with a cut-off shape. Referring to Fig. 9, the fourth surface (140) may be provided to form a roughly rectangular shape with one side open.

[0080] Additionally, one side of the connecting portion (200) that is in contact with the central portion of the fourth surface (140) may be provided as a plane corresponding to the shape of the central portion of the fourth surface (140) so as to be interlocked with the central portion of the fourth surface (140).

[0081] Additionally, the other surface of the connecting portion (200) may be provided as an outwardly convex curved surface. In other words, referring to FIGS. 7 and 11, the other surface of the connecting portion (200) may be provided as a curved surface having a curvature corresponding to a portion of the first surface (110) and the second surface (120).

[0082] In addition, the connecting portion (200) can be inserted into the space portion (150), and the other surface of the connecting portion (200) can be positioned at the same or close to the vertical direction of the edges of the first surface (110) and the second surface (120).

[0083] At this time, since the front sides of both sides of the fourth surface (140) correspond to empty space portions (150), parts of both sides of the connecting portion (200) are exposed. Therefore, when connecting the connecting portion (200) to or separating from the body portion (100), parts of both exposed sides can serve as handles that can be held by the worker.

[0084]

[0085] Next, with reference to FIGS. 2 to 6, a method for fixing a welding rod using a welding rod fixing device according to the first embodiment of the present invention will be described.

[0086] A welding rod fixing method according to the present invention includes: (S1) a step of inserting a welding rod (10) so as to pass through a first hole (111) and a second hole (121) simultaneously; (S2) a step of inserting a joining part (200) into a space (150); and (S3) a step of inserting and fixing a fastening member (300) into a fastening groove (142) and a fastening hole (220).

[0087] In step (S2), the joint (200) can pressurize a portion of the welding rod (10) placed in the first groove (141) through the second groove (210).

[0088] As described above, the welding rod fixing device according to the first embodiment of the present invention and the welding rod fixing method using the same can fix the welding rod (10) by inserting the connecting portion (200) into the space portion (150) and pressurizing the welding rod (10) while the welding rod (10) has passed through the first hole (111) and the second hole (121).

[0089] Although the welding rod fixing device according to the first embodiment has been described as an example, the welding rod fixing device according to the second embodiment can also fix the welding rod in the same way.

[0090]

[0091] As described above, specific parts of the present invention have been described in detail. To those skilled in the art, such specific descriptions are merely preferred embodiments, and the scope of the present invention is not limited thereby. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea of ​​the present invention, and it is natural that such changes and modifications fall within the scope of the appended patent claims.

[0092] (Explanation of symbols)

[0093] 10: Welding rod

[0094] 100: Body

[0095] 110: 1st side 111: 1st hall

[0096] 120: Second side 121: Second hole

[0097] 130: Page 3

[0098] 140: Page 4

[0099] 141: 1st groove 142: Closing groove

[0100] 150: Space Department

[0101] 200: Joint

[0102] 210: 2nd groove 220: Connection hole

[0103] 300: Absence of fasteners

Claims

1. A body portion including a first surface having a first hole formed in the center through which a welding rod can pass, a second surface having a second hole formed in the center through which the welding rod can pass and corresponding to the first hole, a third surface connecting the first surface and the second surface, a space portion formed such that a portion of an outer peripheral surface formed by the third surface is open and is hollow from a portion of the outer peripheral surface to a central portion where the first hole and the second hole are connected, and a fourth surface forming the space portion; and A welding rod fixing device characterized by including a joining part which can be inserted into the above space and is provided to pressurize the welding rod passing through the first hole and the second hole.

2. In paragraph 1, A welding rod fixing device characterized in that the above-mentioned connecting portion is inserted into the above-mentioned space portion and is provided to contact the above-mentioned fourth surface and pressurize the above-mentioned welding rod together with the above-mentioned fourth surface.

3. In paragraph 2, In the above body part, a first groove corresponding to a part of the shape of the welding rod is formed on the fourth surface that comes into contact with the above joint part. A welding rod fixing device characterized in that a second groove is formed on one side of the connecting portion that is in contact with the fourth side, the second groove corresponding to a portion of the shape of the welding rod.

4. In paragraph 1, A welding rod fixing device characterized in that it further includes a fastening member so that the connecting portion is connected to the body portion after being inserted into the space portion.

5. In paragraph 4, The fourth surface has a fastening groove formed so that the fastening member can be inserted, A welding rod fixing device, characterized in that the above-mentioned connecting member includes a fastening hole formed so that the fastening member can be inserted into a position corresponding to the fastening groove.

6. In paragraph 5, The above fastening member has a male screw thread formed on the outer surface and is provided so as to be able to pass through the above fastening groove and the above fastening hole at the same time. A welding rod fixing device characterized in that a female screw thread is formed in the above fastening groove and the above fastening hole, and the fastening member, the above fastening groove and the above fastening hole are connected by a screw connection method.

7. In paragraph 5, The above-mentioned fastening groove is formed toward the space portion, and is formed in multiple numbers with the first groove in between so as not to interfere with the first groove. A welding rod fixing device characterized in that the above fastening holes are formed so as to cross the one side and the other side of the joint, and are formed in multiple numbers with the second groove interposed therebetween so as not to interfere with the second groove.

8. In paragraph 2, The central portion of the above fourth surface is provided with a concave curved surface toward the third surface, A welding rod fixing device, characterized in that the one side of the above-mentioned joining part is provided with a curved surface corresponding to the shape of the central portion of the fourth surface so as to be engaged with the central portion of the fourth surface.

9. In paragraph 8, A welding rod fixing device characterized in that the other surface of the above-mentioned joint is located on the inner side of the above-mentioned space and is provided in a flat shape.

10. In paragraph 2, The central part of the above fourth side is provided as a flat surface, A welding rod fixing device, characterized in that the one side of the above-mentioned joining part is provided with a plane corresponding to the shape of the central part of the fourth surface so as to be engaged with the central part of the fourth surface.

11. In paragraph 10, A welding rod fixing device characterized in that the other surface of the above-mentioned joint is provided with an outwardly convex curved surface.

12. A method of fixing a welding rod using a welding rod fixing device according to any one of clauses 1 to 11, (S1) A step of inserting the welding rod (10) so as to pass through the first hole and the second hole simultaneously; (S2) a step of inserting the joining part into the space; and (S3) A welding rod fixing method, characterized by including a step of inserting and fixing the fixing member into the fixing groove and the fixing hole.

13. In paragraph 12, In the above step (S2), A welding rod fixing device characterized in that the above-mentioned joint pressurizes a portion of the welding rod placed in the above-mentioned first groove through the above-mentioned second groove.

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