Method and device for processing outring welds on cathode drums for electrolytic deposition

Abstract

The present invention relates to a treatment method and apparatus for treating the microstructure of a welded joint formed by rolling two base metals and butting their ends together to weld, so that the welded joint becomes homogenized to the same metallic microstructure as the base metal. The present invention is characterized by comprising the steps of: rolling the base material portion of an out ring into a round shape with a predetermined diameter, butting the ends together, and welding; mounting the out ring on the upper part of the lower pressure plate of a welding processing device such that the weld portion of the out ring is positioned towards the center; operating the first and second transfer devices provided in the welding processing device to apply horizontal pressure so that both ends of the base material portion of the out ring are in close contact with each other; and cutting the weld portion protruding while being pressed by the pressure step so that it matches the surface of the base material portion. The present invention has the effect of directly connecting the base materials to each other by maximally removing the weld portion of the outring and treating the metal structure between the weld portion and the base material to be as homogenized as possible.

Description

Technology Field

[0001] The present invention relates to a method and apparatus for treating an out-ring weld of a cathode drum for electrolytic deposition, and more specifically, to a method and apparatus for treating the microstructure of a weld formed by rolling two base metals and butting their ends together to weld, so as to homogenize it into a metallic microstructure identical to that of the base metal. Background Technology

[0003] Generally, the outrings used in cathode drums are produced by depositing an ultra-thin copper film with a thickness in the micron range within a copper sulfate solution, so special metal materials such as pure titanium, zirconium, and stainless steel, which are resistant to corrosion, are used.

[0004] In particular, titanium and zirconium are highly sensitive to the heat generated during welding; compared to other metals, they oxidize easily and form a wide Heat Affected Zone (HAZ). Therefore, a high level of welding skill is required during the welding process, and technical treatments to completely prevent oxidation are necessary. Furthermore, the metal structure of the weld zone tends to become significantly columnar.

[0005] For example, titanium may experience problems such as porosity and bead discoloration due to poor inert gas shielding during welding, and cracking in the weldment caused by embrittlement resulting from oxidation and nitriding.

[0006] In addition, since this outring is formed in a cylindrical shape, the metal base material is rolled into a circle and welded with a butt-length weld seam at the point where they meet. At this time, when welding in this manner, measures to prevent oxidation caused by the penetration of oxygen from the air are required, and welding techniques are applied, such as measures for appropriate current, welding speed, prevention of deformation and defects, maintenance of the mechanical and chemical properties of the weld metal, minimization of the heat-affected zone due to excessive heat input during welding, and establishment and maintenance of a clean environment and conditions for welding.

[0007] When welding is completed in such an optimal state, the soundness of the weld metal is confirmed through non-destructive testing of the weldment. However, even if the best welding quality is obtained in a perfect state, the difference between the unstable columnar structure and the structured spheroidal structure of the base metal remains, resulting in weak brittleness. Therefore, it is necessary to technically process this weld metal secondarily to homogenize it into a spheroidal structure, which is a base metal structure that is completely densely composed.

[0008] In this case, since the metallic mechanical properties of the welded part of the outring are significantly lower than those of the base material, cracks may occur in the welded part during the shrink-fit bonding process.

[0009] In addition, although the metal foil manufactured by peeling off the surface of the outring must be produced with a consistent and identical profile, areas of the metal foil experience periodic quality degradation due to welded joints that have changed in properties different from the base material of the outring.

[0010] Therefore, it is necessary to fundamentally prevent cracking of the outring weld and to increase the metallic strength through maximum homogenization treatment of the weld to make it identical to the base material. Prior art literature

[0012] Republic of Korea Published Patent No. 10-2021-0082853 Republic of Korea Published Patent No. 10-2018-0040068 The problem to be solved

[0013] The present invention aims to solve the problem of ensuring that the welded portion, formed by rolling the outring into a circular shape and welding both ends, becomes as homogeneous as possible with the metal structure of the base material, thereby achieving the effect of directly connecting the base materials to each other. means of solving the problem

[0015] The present invention provides a method for solving the above-mentioned problem, comprising the steps of: rolling the base material portion of an out-ring into a round shape with a predetermined diameter to butt the ends together and then welding; mounting the out-ring on the upper part of the lower pressure plate of a welding processing device such that the weld portion of the out-ring is positioned towards the center; operating the first and second transfer devices provided in the welding processing device to apply horizontal pressure so that both ends of the base material portion of the out-ring are in close contact with each other; and cutting the weld portion protruding while being pressed by the pressure step so that it matches the surface of the base material portion.

[0016] According to one embodiment of the present invention, after mounting the outring on the upper part of a welding processing device, first and second upper pressure bands are coupled to the inner side of the outring, and the first and second transfer devices each operate in the direction toward the center of the outring to apply pressure so that the outer ends of both sides of the base material portion of the outring are in close contact with each other, and the first and second upper pressure bands also operate integrally with the first and second lower pressure bands by the operation of the first and second transfer devices to apply horizontal pressure so that the inner ends of both sides of the base material portion of the outring are in close contact with each other.

[0017] According to one embodiment of the present invention, in the step of horizontally pressing both ends of the base material portion of the outring, the welding portions of the outer surface and the inner surface of the base material portion of the outring are each heated to a high temperature while horizontally pressing.

[0018] The present invention is a device for solving the above-mentioned problems, characterized by comprising: first and second fixed support members installed spaced apart at a predetermined interval; first and second lower pressure bands each coupled in the transverse direction between the first and second fixed support members; and first and second transfer devices that slide the first and second lower pressure bands each in the longitudinal direction of the first and second fixed support members.

[0019] According to one embodiment of the present invention, the first and second lower pressure bands support and pressurize the outer surface of the base material portion of the out ring, and the first and second upper pressure bands are further coupled to the upper portions of the first and second lower pressure bands to support and pressurize the inner surface of the base material portion of the out ring.

[0020] According to one embodiment of the present invention, a lower heating band is provided between the first and second lower pressure bands to heat the outer surface of the out ring to a high temperature, and an upper heating band is further provided between the first and second upper pressure bands to heat the inner surface of the out ring to a high temperature.

[0021] According to one embodiment of the present invention, the lower heating zone and the upper heating zone are supported by rollers and are characterized by sliding left and right.

[0022] According to one embodiment of the present invention, the upper surface of the first and second lower pressure bands and the lower surface of the first and second upper pressure bands are each further coupled with a contact band.

[0023] According to one embodiment of the present invention, the first and second transfer devices are characterized by having first and second cylinder fixing members, and including first and second cylinders that are respectively coupled between the first and second cylinder fixing members and the first and second lower pressure members to respectively slide the first and second lower pressure members.

[0024] According to one embodiment of the present invention, protrusions are provided at both ends of the first and second lower pressure bands, respectively, and sliding operating grooves are formed in the first and second fixed support members so that the protrusions of the first and second lower pressure bands can be fitted and coupled to enable sliding operation. Effects of the invention

[0026] The present invention has the effect of directly connecting the base materials to each other by maximally removing the weld portion of the outring and treating the metal structure between the weld portion and the base material to be as homogenized as possible. Brief explanation of the drawing

[0028] FIG. 1 is a simplified exemplary diagram showing the fixed support and the lower pressurizing plate separately from the out-ring welding processing device of the cathode drum for electrolytic deposition according to the present invention. FIG. 2 is a simplified exemplary diagram illustrating a state in which the upper part of a fixed support is separated while a lower pressure band is coupled to a fixed support of an out-ring welding processing device for an electrode deposition cathode drum of the present invention. FIG. 3 is a simplified exemplary diagram illustrating a state in which a lower pressure band is coupled to a fixed support of an out-ring welding processing device for a cathode drum for electrolytic deposition according to the present invention. FIG. 4 is a simplified planar example illustrating the combined state of the fixed support, lower pressure band, and lower heating band of the outring welding processing device for the cathode drum for electrolytic deposition according to the present invention. FIG. 5 is a simplified exemplary diagram illustrating a separated state in which the fixed support and the lower pressurizing band are combined and the upper pressurizing band is separated of the out-ring welding processing device for the cathode drum for electrolytic deposition according to the present invention. FIG. 6 is a simplified exemplary diagram illustrating the state in which the fixed support and the lower pressure band are combined, and the lower heating band and the upper heating band are separated, of the out-ring welding processing device for the cathode drum for electrolytic deposition according to the present invention. FIG. 7 is a simplified side view illustrating the overall configuration of the out-ring welding processing device of the cathode drum for electrolytic deposition according to the present invention in disassembled form. FIG. 8 is a simplified exemplary diagram illustrating the state in which an out-ring is coupled to the out-ring welding processing device of the cathode drum for electrolytic deposition according to the present invention. FIG. 9 is a simplified exemplary diagram illustrating the state in which an out-ring is mounted while the fixed support, lower pressure band, and lower heating band of the out-ring welding processing device for an electrodeposition cathode drum of the present invention are combined. FIG. 10 is a simplified exemplary diagram illustrating the state in which an out-ring is coupled and an upper pressurizing band is coupled to the out-ring welding processing device of the cathode drum for electrolytic deposition according to the present invention. FIG. 11 is a simplified cross-sectional view illustrating the state in which an out-ring is mounted on an out-ring welding processing device for an electrode deposition cathode drum according to the present invention, and an upper heating zone and a lower heating zone are combined. FIG. 12 is a simplified cross-sectional view with partial cutouts illustrating the state in which the inner and outer surfaces of an outring mounted on an outring welding processing device of a cathode drum for electrolytic deposition according to the present invention are in close contact. FIG. 13 is a simplified example of a partial side cross-sectional view illustrating the state in which the first and second transfer devices are operated to horizontally press the outring in the state of FIG. 12. FIG. 14 is a simplified flowchart of the method for treating the out-ring weld of a cathode drum for electrolytic deposition according to the present invention. Specific details for implementing the invention

[0029] Specific structural or functional descriptions of embodiments of the present invention disclosed in this specification or application are merely illustrative for the purpose of explaining embodiments according to the present invention, and embodiments according to the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this specification or application.

[0030] Since embodiments according to the present invention may be subject to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit embodiments according to the concept of the present invention to specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention.

[0031] Terms such as first and second may be used to describe various components, but said components should not be limited by said terms. For the sole purpose of distinguishing one component from another, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0032] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. Conversely, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Other expressions describing the relationship between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," should be interpreted in the same way.

[0033] The terms used herein are merely for describing specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to specify the existence of the implemented features, numbers, steps, actions, components, parts, or combinations thereof, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0034] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification.

[0035] The out-ring welding processing device of the cathode drum for electrolytic deposition according to the present invention may include first and second fixed support members (110a) (110b) and first and second lower pressure bands (120a) (120b) installed on the upper part of the bottom plate (10), and first and second transfer devices (130a) (130b) and first and second upper pressure bands (140a) (140b).

[0036] Here, the first fixed support member (110a) and the second fixed support member (110b) are fixedly installed on the upper part of the bottom plate (10) at a predetermined interval. Additionally, a protruding operating member (111a) (111b) is formed through the middle section of the first and second fixed support members (110a) (110b) to enable sliding operation by combining the first lower pressure member (120a) and the second lower pressure member (120b), and a spacing member (112a) (112b) is provided in the middle section of the protruding operating member (111a) (111b).

[0037] The first and second fixed support members (110a) (110b) of the present invention may be assembled by dividing the upper and lower intermediate members. To this end, the first and second lower blocking members (113a) (113b) and the spacing members (112a) (112b) are provided spaced apart at a predetermined interval, and the first and second upper blocking members (114a) (114b) may be provided.

[0038] The first and second lower pressure bands (120a) (120b) are transversely fitted and coupled between the first fixed support member (110a) and the second fixed support member (110b), and protrusions (121a) (121b) are formed protrudingly at each of the two ends, and a contact band (122a) (122b) may be provided on the upper surface to contact the outer surface of the out ring (20). At this time, it is preferable that the protrusions (121a) (121b) have a width smaller than the size of the protrusion operating member (111a) (111b).

[0039] That is, the protrusions (121a) (121b) at both ends of the first and second lower pressure bands (120a) (120b) are respectively fitted into the protrusion operating parts (111a) (111b) of the first and second fixed support parts (110a) (110b) and slide over the width of the protrusion operating parts (111a) (111b).

[0040] In addition, a first transfer device (130a) and a second transfer device (130b) are respectively provided to slide the first lower pressure band (120a) and the second lower pressure band (120b).

[0041] This may include first and second cylinder fixing members (131a) (131b) that are spaced apart from the first and second lower pressure members (120a) (120b) and fixedly coupled to the bottom plate (10), and first and second cylinders (132a) (132b) coupled between the first and second lower pressure members (120a) (120b) and the first and second cylinder fixing members (131a) (131b).

[0042] Additionally, the first and second upper pressure bands (140a) (140b) are formed parallel to the first and second lower pressure bands (120a) (120b) and are coupled to the upper portions of the first and second lower pressure bands (120a) (120b). It is preferable that a coupling band (123) (143) be provided at each end of the first and second lower pressure bands (120a) (120b) and the end of the first and second upper pressure bands (140a) (140b) so as to be coupled by a coupling means such as a bolt. Furthermore, a contact band (141a) (141b) may be provided on the bottom surface to contact the inner surface of the out ring (20).

[0043] A lower heating zone (150) may be further provided in the central portion between the first fixed support member (110a) and the second fixed support member (110b), and an upper heating zone (160) may be further provided between the first upper pressure zone (140a) and the second upper pressure zone (140b).

[0044] The lower heating zone (150) and the upper heating zone (160) are for heating the inner and outer surfaces of the out ring (20) to a high temperature and may include a heating support plate (151)(161), a combustion part (152)(162), a gas injection pipe (154)(164), and a circulating cooling water injection pipe (155)(165).

[0045] The heating support plates (151) (161) are each provided in parallel between the first and second lower pressure zones (120a) (120b) and between the first and second upper pressure zones (140a) (140b), and the combustion parts (152) (162) are each provided at a predetermined interval in the upper or lower direction of the heating support plates (151) (161).

[0046] In addition, the gas injection pipes (154) and (164) are each connected to the combustion section (152) and (162) to supply gas, and the circulating cooling water injection pipes (155) and (165) circulate cooling water, thereby preventing the lower heating zone (150) and the upper heating zone (160) from being heated to a high temperature. Furthermore, although not shown in the drawing, it is desirable to circulate cooling water to the contact zones (122a) and (122b) of the first and second lower pressure zones (120a) and (120b), the contact zones (141a) and (141b) of the first and second upper pressure zones (140a) and (140b), and to the first and second upper pressure zones (140a) and (140b).

[0047] Additionally, a roller (156) (166) is provided on the lower side of the lower heating plate (150) and the upper heating plate (160), respectively, and a sliding operating plate (157) (167) is provided on the heating support plate (151) (161), respectively, so that the heating support plate (151) (161) can slide left and right.

[0048] Hereinafter, a method for treating a welded part using the out-ring welded part treatment device of the cathode drum for electrolytic deposition of the present invention configured as above will be described.

[0049] In order to manufacture an outer ring (20) by rolling a base material (21) made of titanium metal or the like into a round shape, the metal base material (21) is rolled into a certain circular shape, and then the two ends of the base material (21) are brought together so that they come into close contact with each other and welded (S100).

[0050] To this end, the outer surface of both base material parts (21) is first chamfered and ground along the circumference to have a certain angle of inclination, and then welding is performed. As the two base material parts (21) are welded together, a welded portion (22) is formed that protrudes further than the outer and inner surfaces of the base material parts (21). Then, the protruding welded portion (22) is cut to match the surface of the base material part (21) (S110).

[0051] Therefore, although the surface of the base material part (21) of the outring (20) and the surface of the weld part (22) are aligned and homogenized, a problem may arise in which the quality of the metal sheet is degraded in the part in contact with the weld part (22) during the manufacture of the metal sheet due to the weld part (22) having changed to a different property from the base material part (21).

[0052] In the present invention, the weld (22) formed at the end of the base material (21) is removed as much as possible. To this end, the welded out-ring (20) is moved using a crane or the like and then placed on the upper part of the first and second lower pressure bands (120a) (120b) of the out-ring weld processing device of the cathode drum for electrolytic deposition (S120).

[0053] When the central axis of the out ring (20) is positioned in the center of the first and second fixed support parts (110a) (110b), the outer surface of the out ring (20) is positioned to be in close contact with the upper surface of the contact member (122a) (122b) of the first and second lower pressure members (120a) (120b) installed at a predetermined interval.

[0054] Then, the first and second upper pressure bands (140a) and (140b) are inserted into the inner side of the out ring (20), respectively, and the end connecting bands (143) of the first and second upper pressure bands (140a) and (140b) are positioned so that they come into contact with each other, and then they are firmly connected by means of a connecting means such as a bolt (S130).

[0055] Accordingly, the contact bands (141a) (141b) of the first and second upper pressure bands (140a) (140b) are also joined to be in close contact with the inner surface of the out ring (20).

[0056] An upper heating zone (160) is inserted between the first and second upper pressure zones (140a) (140b) and connected to be positioned above the lower heating zone (150). Gas injection pipes (154) (164) are connected to supply gas, and circulating cooling water injection pipes (155) (165) are connected to supply circulating cooling water, thereby circulating the cooling water. Additionally, cooling water is circulated to the contact zones (122a) (122b) of the first and second lower pressure zones (120a) (120b), the contact zones (141a) (141b) of the first and second upper pressure zones (140a) (140b), and the first and second upper pressure zones (140a) (140b).

[0057] And, through a process (S140) in which gas is supplied through the gas injection pipe (154)(164) in the lower heating zone (150) and the upper heating zone (160) and ignition is performed in the combustion section (152)(162) to heat the inner and outer surfaces of the out ring (20) to a temperature of approximately 600 to 1000°C, the horizontal pressurization process of the base material (21) of the out ring (20) can be made easier.

[0058] When the first and second cylinders (132a) (132b) provided in the first and second transfer devices (130a) (130b) of the cathode drum for electrolytic deposition of the present invention, in which the out-ring (20) is installed, are operated to pull out the cylinder rod, the contact bands (122a) (122b) of the first and second lower pressure bands (120a) (120b) are in contact with the outer surface of the out-ring (20), and the contact bands (141a) (141b) of the first and second upper pressure bands (140a) (140b) are in contact with the inner surface of the out-ring (20), and the inner and outer surfaces of the out-ring (20) are each pressed little by little toward the center (S150).

[0059] That is, when the contact bands (122a) (122b) of the first and second lower pressure bands (120a) (120b) horizontally press the outer surfaces of both sides of the out ring (20) with a predetermined pressure in the direction of the central axis, and the contact bands (141a) (141b) of the first and second upper pressure bands (140a) (140b) horizontally press the inner surfaces of both sides of the out ring (20) with a predetermined pressure in the direction of the central axis, the welded portion (22) of the out ring (20) is pushed out convexly up and down, and the base material portion (21) and the base material portion (21) are joined together little by little.

[0060] At this time, the cylinder rods of the first and second cylinders (132a) (132b) of the first and second transfer devices (130a) (130b) that advance by applying pressure can be controlled by setting values ​​for speed and travel distance, etc., controlled by a separate control panel, and can be systemically controlled so that they advance simultaneously while interfacing with the operation of the first and second cylinders (132a) (132b) and automatically stop when they reach the indicated distance.

[0061] And, as the piston of the sliding operating unit (157)(167) is repeatedly pulled out and inserted, the heating support plates (151)(161) of the lower heating unit (150) and the upper heating unit (160) are supported by rollers (156)(166) and slide left and right, respectively, so that a wide area can be heated evenly.

[0062] When the horizontal pressurization process of the base material (21) of the outring (20) is completed for a predetermined period of time and the homogenization process of the base material (21) is improved, the gas supplied to the lower heating zone (150) and the upper heating zone (160) is stopped to allow for extinguishing.

[0063] When the horizontal pressure of the base material (21) of the out ring (20) is finished, the upper heating zone (160) and the first and second upper pressure zones (140a) (140b) are separated and disassembled, then pulled out and removed (S160), and the out ring (20) is moved to a separate location and then the cutting process of the protruding welded part (22) that was pressured is performed (S170).

[0064] Accordingly, the weld portion (22) of the unstable columnar structure of the present invention is removed as much as possible and homogenized by spheroidizing it into a metal structure identical to the metal of the base material (21). The outring (20), which has thus completed the spheroidizing treatment of the metal structure, is inspected for the degree of spheroidizing treatment of the metal structure by a separate device (S180).

[0065] And, when it is determined by inspection that the spheroidization and homogenization treatment of the metal structure of the outring (20) is complete, the work is completed (S190).

[0066] However, if the degree of spheroidization treatment of the metal structure is insufficient during the inspection stage, the process can be repeated from the step (S120) of placing the outring (20) on the upper part of the first and second lower pressure bands (120a) (120b) of the outring weldment processing device of the cathode drum for electrolytic deposition to the spheroidization treatment inspection stage (S190).

[0067] When a metal sheet is produced using the outring (20) that has undergone such spherical and homogenization treatment, a high-quality product can be obtained. Explanation of the symbols

[0069] 110a, 110b: 1st and 2nd fixed support parts 111a, 111b: Protrusion operating part 120, 120b: 1st and 2nd lower pressure bands 121a, 121b: Protrusions 122a, 122b, 141a, 141b: Contact member 123, 143: Connecting member 130a, 130b: 1st and 2nd transfer devices 131a, 131b: 1st and 2nd cylinder holders 132a, 132b: 1st and 2nd cylinders 140a, 140b: 1st and 2nd upper pressure zones 150 : Lower heating zone 151, 161 : Heating support plate 152,162 : Combustion part 154, 164: Gas injection pipe 155, 165: Circulating cooling water injection pipe 156,166 : Roller 157,167 : Sliding operating table

Claims

Claim 1 delete Claim 2 delete Claim 3 delete Claim 4 A homogenization treatment device for a metal structure base material of an out-ring weldment, comprising: first and second fixed support members installed spaced apart at a predetermined interval; first and second lower pressure bands each coupled transversely between the first and second fixed support members; and first and second transfer devices that slide the first and second lower pressure bands each along the longitudinal direction of the first and second fixed support members, wherein the first and second lower pressure bands support and pressurize the outer surface of the base material portion of the out-ring, and first and second upper pressure bands are further coupled to the upper portions of the first and second lower pressure bands to support and pressurize the inner surface of the base material portion of the out-ring, wherein a lower heating band is provided between the first and second lower pressure bands to heat the outer surface of the out-ring to a high temperature, and an upper heating band is further provided between the first and second upper pressure bands to heat the inner surface of the out-ring to a high temperature, and wherein the lower heating band and the upper heating band are supported by rollers and slide left and right. Claim 5 A homogenization treatment apparatus for an out-ring weld metal structure base material, characterized in that, in claim 4, a contact member is further coupled to the upper surface of the first and second lower pressure bands and the lower surface of the first and second upper pressure bands, respectively. Claim 6 A homogenization treatment device for a metal structure base material of an out-ring weldment, characterized in that, in claim 4, the first and second transfer devices are provided with first and second cylinder fixing members, and each includes first and second cylinders that are respectively coupled between the first and second cylinder fixing members and the first and second lower pressure members to respectively slide the first and second lower pressure members. Claim 7 A homogenization treatment device for a metal structure base material of an out-ring weldment, comprising: first and second fixed support members installed spaced apart at a predetermined interval; first and second lower pressure bands each coupled transversely between the first and second fixed support members; and first and second transfer devices that slide the first and second lower pressure bands each along the longitudinal direction of the first and second fixed support members, wherein protrusions are provided at both ends of the first and second lower pressure bands, and sliding operating grooves are formed in the first and second fixed support members so that the protrusions of the first and second lower pressure bands can be fitted and operated slidingly. Claim 8 A method for homogenizing the metal structure of an out-ring weldment base material, characterized by comprising: a step of using a processing device according to any one of claims 4 to 7 to roll the base material of the out-ring into a round shape with a predetermined diameter, butting the ends together, and welding; a step of placing the out-ring on the upper part of the lower pressure plate of the weldment processing device such that the weldment of the out-ring is positioned on the central side; a step of operating the first and second transfer devices provided in the weldment processing device to apply horizontal pressure so that both ends of the base material of the out-ring are in close contact with each other; and a step of cutting the weldment protruding while being pressed by the pressure step so that it matches the surface of the base material. Claim 9 delete Claim 10 delete

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