Marine T-Bar Welding Apparatus

Abstract

The present invention relates to a welding device for a ship for manufacturing a T-bar by welding a web plate (2) to a flange plate (1). The device comprises a support jig part (10) that restrains two sides of the widthwise corners of the flange plate (1), a pair of support arms (20) arranged parallel in the longitudinal direction, a center body part (30) that adjusts the spacing of the support arms (20), a rail arm (40) installed at the bottom, a carriage (50) that moves along the rail arm (40) by means of a plurality of transfer rollers (51), a transverse rail (60) on the carriage (50), and a torch support (70) that includes a welding torch part (71) that moves in opposite directions along the transverse rail (60) and approaches the joining position of the web plate (2) based on the centerline of the flange plate (1). By including the torch support (70), the device improves welding position precision while maintaining structural alignment based on the flange plate (1) and enables symmetric welding regardless of deformation or eccentricity of the web plate (2), thereby allowing for welding even during long-distance welding. It has the effect of simultaneously ensuring uniformity of welding quality and operational stability.

Description

Technology Field

[0001] The present invention relates to a T-bar welding device for ships, and more specifically, to a T-bar welding device for ships that can improve welding precision and work efficiency by including a structure aligned and supported based on both sides of a flange plate, a movable welding torch, and a welding byproduct disposal compartment. Background Technology

[0003] T-bars, widely used in ship structures, are structural members manufactured by joining flange plates and web plates via fillet welding, playing a key role in ensuring longitudinal and transverse rigidity of the hull. In particular, for T-bars applied to fuel tank structures of vessels using liquefied gas as fuel, such as LNG-fueled ships, low-temperature steels such as high-manganese steel (HMn) or stainless steel, which possess excellent mechanical properties in cryogenic environments (-163°C), are utilized.

[0004] However, these austenitic steels have a lower thermal diffusivity and a higher thermal expansion coefficient compared to carbon steel, and thus exhibit characteristics where welding deformation occurs two to three times more significantly under the same heat input conditions. As a result, suppressing and controlling welding deformation in the T-bar manufacturing process has emerged as a key technological challenge, and the development of automated welding carriages and related process technologies to address this has been continuously pursued.

[0005] As prior art related to this, Registered Patent No. 10-2289311 (hereinafter referred to as the "prior art") discloses a T-bar welding carriage for ships for producing a T-bar by welding a web plate to a flange plate, and a method for producing a T-bar using the same.

[0006] The above-described prior art adopts a configuration in which a rail section, consisting of a guide rail and a fixed block, is installed on the upper part of a web plate, and a welding section and a heating section capable of sliding along the rail section are provided. The welding section is configured such that a pair of welding torches are fixed in position at an angle of 45 degrees relative to the center of the width direction of the flange plate, thereby enabling simultaneous welding of the area where the flange plate and the web plate meet from both sides. Additionally, the heating section, which is movably installed on the rail section, is configured to reduce longitudinal bending and transverse bending deformations occurring during welding operations by simultaneously heating both upper sides of the web plate with a heating torch. Furthermore, the configuration includes a control unit that controls the movement of the remaining torch and the welding section to stop in conjunction when the operation of either of the pair of welding torches is interrupted, thereby maintaining the continuity of double-sided welding and suppressing the occurrence of porosity.

[0007] However, since the conventional technology has a structural characteristic in which the guide rail is directly mounted on the upper part of the web plate, it contains the following technical limitations.

[0008] First, the installation precision of the guide rail is dependent on the flatness and bending condition of the web plate itself. If there is a deviation in flatness or bending in the web plate, the straightness and horizontality of the rail become uneven in conjunction with this, which leads to a decrease in the positional precision of the welding torch and causes serious adverse effects on welding quality.

[0009] Second, in order to secure the guide rail to the top of the web plate, a basic setup operation must be performed first, which involves installing multiple fixing blocks at regular intervals and fastening them with bolt members. However, when dealing with long T-bars of 10m or more, the total weight of the equipment, including the rail section, is substantial, making initial setup and equipment movement virtually impossible without the deployment of heavy equipment, including cranes. This entails increased work preparation time, reduced operational flexibility at the site, and increased equipment investment costs, while also creating safety risks associated with the operation of heavy equipment in a confined shipbuilding environment.

[0010] Third, since the rail section is fixed to the upper part of the web plate, the alignment of the equipment with respect to the center of the flange plate in the width direction depends on the precision of the web plate's upright position. Consequently, if a deviation in the verticality of the web plate occurs, it becomes difficult to maintain the symmetrical positioning of the welding torches on both sides, which can lead to left-right asymmetric defects in the fillet weld.

[0011] Therefore, there is an urgent need to develop technology that can simultaneously ensure uniformity of welding quality and work productivity by reliably securing rail installation precision regardless of the flatness and bending of the web plate, enabling rapid equipment setup and movement on-site without heavy equipment such as cranes, and automatically maintaining the symmetrical position of the welding torch relative to the center of the flange plate width direction. Prior art literature

[0013] (Patent Document 0001) KR 10-2289311 B1 The problem to be solved

[0014] Accordingly, the present invention was conceived to solve the aforementioned problems, and the purpose of the present invention is to provide a T-bar welding device for ships capable of simultaneously performing symmetrical movement of the welding torch and processing of welding by-products within the compartment while maintaining structural alignment based on both sides of the flange plate. means of solving the problem

[0016] To achieve this purpose, the features of the present invention include a welding carriage for a ship for producing a T-bar by welding a web plate (2) to a flange plate (1), comprising: a support jig part (10) formed in an L-shape to be constrained on two sides of the corners in the width direction of the flange plate; a pair of support arms (20) installed longitudinally on the support jig part (10) and provided in parallel; a center body part (30) installed on the upper part of the support arms (20) and provided to adjust the spacing between the pair of support arms (20); a rail arm (40) installed on the lower part of the center body part (30); a carriage (50) provided with a plurality of transfer rollers (51) to move along the rail arm (40) in the length direction of the flange plate; and a transverse rail (60) installed transversely on the carriage (50). It is characterized by including a torch support (70) which is installed at each end of the horizontal rail (60), moves in opposite directions along the horizontal rail (60), and has a welding torch part (71) at the bottom so as to approach the joining position with the web plate (2) based on the centerline in the width direction of the flange plate (1).

[0017] At this time, the center body part (30) comprises a guide body (34) which is positioned to correspond to the width direction center of the flange plate (1), and has first and second rack guide holes (31)(31') and first and second rod holes (32)(32') formed parallel to each other in the transverse direction, and has a rail arm (40) installed at the bottom; first and second racks (35)(35') which are respectively inserted into the first and second rack guide holes (31)(31') and are respectively connected to a pair of support arms (20); a pinion (36) which is installed within the guide body (34), engages with the first and second racks (35)(35'), and is configured to linearly move the first and second racks (35)(35') in mutually opposite directions by rotational movement; and a pair of which are respectively inserted into the first and second rod holes (32)(32'). It is characterized by including first and second rods (37)(37') respectively connected to the support arm (20), and by the rotation of the pinion (36), the first and second racks (35)(35') and the first and second rods (37)(37') are moved in opposite directions by the same amount of transport, so that the pair of support arms (20) are configured to maintain a symmetrical position with respect to the centerline in the width direction of the flange plate (1) while adjusting the spacing.

[0018] Additionally, a centering module (80) is provided that is installed on the carriage (50) and supports the web plate (2) in an upright state. The centering module (80) includes a horizontal standing rail (81) installed at the bottom of the carriage (50), a pair of standing arms (83) that are installed to move horizontally along the horizontal standing rail (81), are fixed in position by a fixing member (82), and are positioned opposite each other on both sides of the web plate (2), and standing rollers (84) that are installed on the standing arms (83) and move along both sides of the web plate (2). The position of the standing arms (83) is adjusted so that the pair of standing rollers (84) are in close contact with both sides of the web plate (2) positioned on the centerline in the width direction of the flange plate (1), and while the carriage (50) moves in the length direction of the flange plate (1) and a welding process is performed by the welding torch unit (71), a pair The upright roller (84) is provided to guide the web plate (2) so that it moves along both sides of the web plate (2) and is positioned at the center of the width direction of the flange plate (1).

[0019] Additionally, a moving module (21) is installed on the support arm (20), and the moving module (21) includes a lift arm (21a) that extends and retracts in the longitudinal direction, comprising a screw rod installed on the support arm (20) and formed to vary in length by rotation, and a wheel (21b) rotatably installed on the lower part of the lift arm (21a). When the lift arm (21a) extends downward by the rotation of the screw rod, the wheel (21b) comes into contact with the floor surface, causing the support arm (20) to rise and the support jig part (10) to be separated from the flange plate (1). When the lift arm (21a) contracts upward, the wheel (21b) separates from the floor surface, causing the support arm (20) to descend and the support jig part (10) to come into contact with the two sides of the flange plate (1) in the width direction so as to be constrained. The moving module (21) It is characterized by being configured to selectively switch between a welding state in which the support jig part (10) is directly supported on the flange plate (1) and a moving state in which the wheel (21b) is supported on the floor surface.

[0020] Additionally, a byproduct treatment unit (90) is provided for treating welding byproducts including welding gas generated during the welding process performed by the welding torch unit (71), and the byproduct treatment unit (90) includes a partition plate (92) connected to the support jig unit (10) and arranged along the longitudinal direction at the top of the flange plate (1) and spaced apart from one side of the web plate (2) to form a treatment section (91) together with the upper surface of the flange plate (1), a treatment nozzle (93) installed on the torch support (70) and configured to spray treatment gas toward the welding area where the flange plate (1) and the web plate (2) come into contact, and an intake nozzle (94) installed on the partition plate (92) and located at the other end of the treatment section (91) and configured to suck and exhaust gas inside the treatment section (91) to the outside, and the treatment gas sprayed from the treatment nozzle (93) is the treatment section (91) It is characterized by being configured to collect welding byproducts containing welding gas while flowing through the welding area inside and to be transported to the intake nozzle (94).

[0021] In addition, the above-mentioned treatment gas is characterized by comprising 45 to 80 parts by weight of argon (Ar), 5 to 25 parts by weight of helium (He), 2 to 20 parts by weight of carbon dioxide (CO₂), 0.1 to 5 parts by weight of sodium bicarbonate (NaHCO₃), 0.01 to 2 parts by weight of silicon-based fine particles (SiO₂ Fine Particle), 0.01 to 2 parts by weight of alumina fine particles (Al₂O₃ Fine Particle), 0.01 to 1 part by weight of borate compound, and 0.01 to 1 part by weight of polyvinyl alcohol (PVA) fine particles. Effects of the invention

[0023] According to the above configuration and operation, the present invention is configured such that the support jig part is constrained on two sides based on the corners of both flange plates, thereby enabling stable reference alignment without relying on the condition of the web plate, and since the welding torches on both sides are symmetrically moved based on the centerline through the support arm and center body part, the welding position precision is improved, and uniform welding quality can be secured even during long-distance welding through a transport structure using a carriage and a horizontal rail.

[0024] In addition, the centering module guides the web plate to continuously maintain its center position, thereby suppressing eccentricity and tilting that may occur during welding, and the moving module allows for selective switching between the working state and the moving state, ensuring both device mobility and work convenience.

[0025] Furthermore, since welding gas and welding dust flow and are collected within the compartment by a byproduct treatment unit comprising a treatment compartment formed by a diaphragm, a treatment nozzle, and an intake nozzle, external scattering is suppressed and the working environment is improved, and the fine particles and thermal reaction components included in the treatment gas composition enhance the aggregation and collection efficiency of welding byproducts. Brief explanation of the drawing

[0027] FIG. 1 is a schematic diagram showing the overall configuration of a ship T-bar welding device according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing the operating state of a moving module of a ship T-bar welding device according to an embodiment of the present invention. FIG. 3 is a configuration diagram showing the operating state of the center body part of a T-bar welding device for ships according to an embodiment of the present invention. FIG. 4 is a schematic diagram showing a byproduct treatment section of a ship T-bar welding device according to an embodiment of the present invention. Specific details for implementing the invention

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Furthermore, in describing the present invention, detailed descriptions of related known functions are omitted if they are deemed obvious to those skilled in the art and could unnecessarily obscure the essence of the invention.

[0029] FIG. 1 is a schematic diagram showing the overall configuration of a T-bar welding device for ships according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing the operating state of the moving module of the T-bar welding device for ships according to an embodiment of the present invention, FIG. 3 is a schematic diagram showing the operating state of the center body part of the T-bar welding device for ships according to an embodiment of the present invention, and FIG. 4 is a schematic diagram showing the byproduct processing part of the T-bar welding device for ships according to an embodiment of the present invention.

[0030] The present invention relates to a T-bar welding device for ships, which includes a support jig part (10), a support arm (20), a center body part (30), a rail arm (40), a carriage (50), a horizontal rail (60), and a torch support (70) so as to simultaneously perform symmetrical movement of the welding torch and processing of welding by-products within the compartment while maintaining structural alignment with respect to both sides of the flange plate.

[0031] The support jig part (10) according to the present invention is formed in an L-shape so as to be restrained on two sides of the corners in the width direction of the flange plate (1), and forms a restraint structure that generates a reaction force simultaneously on two sides that are orthogonal to each other with respect to the corners of the flange plate (1).

[0032] The two-sided restraint by the support jig part (10) above eliminates the rotational freedom that may occur in single-sided contact and simultaneously suppresses the widthwise displacement and torsional moment of the flange plate (1), and causes the reference coordinate system of the entire device to be directly dependent on the flange plate (1).

[0033] At this time, the load generated during welding is distributed and transmitted through surface contact along the corners of the flange plate (1), thereby alleviating stress concentration and ensuring structural stability.

[0034] In addition, the support arm (20) according to the present invention is installed longitudinally on the support jig part (10) and a pair is provided parallel to each other, and acts as a main structural frame forming a load transfer path along the length direction of the flange plate (1).

[0035] The support arm (20) above distributes and transmits the load generated from the carriage (50) and torch support (70) described later in the longitudinal direction and provides a kinematic reference axis to maintain a symmetrical structure based on the centerline.

[0036] At this time, the load acting on the support arm (20) is decomposed into an axial compressive force and a partial bending moment, and is formed as a pair of structures so that the left and right loads are balanced.

[0037] In addition, the center body part (30) according to the present invention is installed on the upper part of the support arm (20) to adjust the spacing of a pair of support arms (20), and acts as a center alignment mechanism to maintain a symmetrical left-right structure with respect to the center of the width direction of the flange plate (1).

[0038] The above center body part (30) prevents eccentricity based on the centerline by applying an equal amount of opposite direction displacement to the left and right support arms (20) during the gap adjustment process, and consequently ensures that the movement reference of the rail arm (40) and carriage (50) always coincides with the centerline.

[0039] In FIG. 3, the center body portion (30) is positioned to correspond to the width direction center of the flange plate (1), and the first and second rack guide holes (31)(31') and first and second rod holes (32)(32') are formed parallel to each other in the transverse direction, and the guide body (34) has a rail arm (40) installed at the bottom; the first and second racks (35)(35') are respectively inserted into the first and second rack guide holes (31)(31') and are respectively connected to a pair of support arms (20); the pinion (36) is installed within the guide body (34), engages with the first and second racks (35)(35'), and is configured to linearly move the first and second racks (35)(35') in mutually opposite directions by rotational movement; and the pinion (36) is respectively inserted into the first and second rod holes (32)(32') and is respectively connected to a pair of support arms (20). Includes the first and second rods (37)(37').

[0040] And as the first and second racks (35)(35') and the first and second rods (37)(37') move in opposite directions with the same amount of transport by the rotation of the pinion (36), the support arm (20) is adjusted in spacing while maintaining a symmetric position with respect to the centerline of the width direction of the flange plate (1), thereby realizing a centerline-maintaining symmetrical movement rather than a simple spacing adjustment, and performing the role of aligning the movement reference of the rail arm (40) and the carriage (50) with the centerline.

[0041] Accordingly, the center body part (30) is configured to maintain a symmetrical state with respect to the centerline in the width direction of the flange plate (1) while performing the function of adjusting the spacing of a pair of support arms (20).

[0042] In addition, the rail arm (40) according to the present invention is installed at the lower part of the center body (30) and forms a longitudinal linear movement standard while reflecting the result of adjusting the spacing of the support arm (20), and is a structural part that determines the travel path of the carriage (50).

[0043] The rail arm (40) is formed as a rigid body structure that maintains straightness, thereby suppressing the lateral uneven load generated when the carriage (50) moves and uniformly transferring the load to the support arm (20).

[0044] In addition, the carriage (50) according to the present invention is provided with a plurality of transfer rollers (51) to move along the rail arm (40) in the longitudinal direction of the flange plate (1).

[0045] At this time, the plurality of transfer rollers (51) travel along the upper or side surface of the rail arm (40) in a rolling contact state, causing the carriage (50) to move along the rail arm (40) in the longitudinal direction of the flange plate (1).

[0046] The above transfer roller (51) forms a rolling contact state with the rail arm (40) to minimize frictional resistance while stably supporting the vertical load, and is configured to rotate at a constant speed by the drive unit.

[0047] The load acting on the carriage (50) during movement is distributed in the form of point contact or line contact through the transfer roller (51) and transmitted longitudinally along the rail arm (40) to maintain stress balance of the entire structure.

[0048] In addition, the horizontal rail (60) according to the present invention is installed horizontally on the carriage (50) to provide a degree of freedom of movement in the horizontal direction independent of the movement in the longitudinal direction, and forms a reference structure for adjusting the position of the torch support (70) in the width direction.

[0049] The above horizontal rail (60) is arranged in a direction perpendicular to the movement of the carriage (50) to form a two-axis movement structure, allowing for fine adjustment of the welding position.

[0050] In addition, the torch support (70) according to the present invention is installed at each end of the horizontal rail (60) and moves in opposite directions to each other, and is provided with a welding torch part (71) at the bottom.

[0051] The torch support (70) moves to approach the joining position with the web plate (2) based on the centerline in the width direction of the flange plate (1), and at this time, since left-right symmetrical movement is performed so that the position of the welding torch part (71) is balanced with respect to the centerline, eccentricity caused by thermal deformation and shrinkage force occurring during welding is suppressed, and welding conditions on both sides of the joining part are maintained equally so that welding quality can be stably secured.

[0052] At this time, the torch support (70) is not simply translated along the horizontal rail (60), but rather its movement path is set so that it gradually approaches the joint position of the web plate (2) and the flange plate (1) based on the centerline in the width direction of the flange plate (1), and accordingly, the welding torch part (71) forms a position control state that converges toward the joint.

[0053] Additionally, the centering module (80) according to the present invention is a structure installed on a carriage (50) to support a web plate (2) in an upright state, and includes a horizontal upright rail (81) installed at the bottom of the carriage (50), a pair of upright arms (83) installed to be movable in the horizontal direction along the horizontal upright rail (81), fixed in position by a fixing member (82), and positioned opposite each other on both sides of the web plate (2), and upright rollers (84) installed on the upright arms (83) and moving along both sides of the web plate (2).

[0054] Then, by adjusting the position of the standing arm (83) so that a pair of standing rollers (84) are in close contact with both sides of the web plate (2), the standing rollers (84) move along the web plate (2) simultaneously with the movement of the carriage (50), continuously applying a restraining force that suppresses lateral eccentricity. Accordingly, the web plate (2) receives force in a direction guided toward the centerline, and the center alignment is maintained despite deformation occurring during welding.

[0055] At this time, a pair of standing rollers (84) form a restraining structure that applies horizontal reaction forces in opposite directions to both sides of the web plate (2), thereby offsetting the overturning moment generated in the web plate (2) and ensuring that the web plate (2) is stably supported while maintaining an upright state.

[0056] In addition, a moving module (21) is installed on the support arm (20), and the moving module (21) acts as a mechanism for selectively switching the support state of the device based on the aforementioned center alignment structure and load transfer path.

[0057] The above moving module (21) includes a lift arm (21a) that extends and retracts in the longitudinal direction, including a screw rod formed to vary in length by rotation and installed on a support arm (20), and a wheel (21b) that is rotatably installed on the lower part of the lift arm (21a).

[0058] When the lift arm (21a) is extended downward by the rotation of the screw rod, the wheel (21b) comes into contact with the floor surface, and the point of support for the load acting on the support arm (20) is switched from the support jig part (10) to the wheel (21b), and as a result, the support arm (20) rises and the support jig part (10) is separated from the flange plate (1).

[0059] Conversely, when the lift arm (21a) contracts upward, the wheel (21b) is separated from the bottom surface and the support arm (20) descends, and accordingly, the support jig part (10) comes into contact with the two sides of the flange plate (1) in the width direction so as to be restrained.

[0060] In this way, the moving module (21) performs the function of changing the constraint conditions of the structure and selectively switching between the welding state and the moving state by selectively redistributing the load transfer path between the bottom surface and the flange plate (1).

[0061] In addition, a byproduct treatment unit (90) is provided to locally collect and discharge welding byproducts, including welding gas, generated while the welding process is performed by the welding torch unit (71).

[0062] The above byproduct processing unit (90) includes a diaphragm (92) that is connected to the support jig unit (10) and is positioned along the longitudinal direction at the upper surface of the flange plate (1) and spaced apart from one side of the web plate (2) to form a processing section (91) together with the upper surface of the flange plate (1); a processing nozzle (93) that is installed on the torch support (70) and is configured to spray processing gas toward the welding area where the flange plate (1) and the web plate (2) meet; and an intake nozzle (94) that is installed on the diaphragm (92) and is located at the other end of the processing section (91) and is configured to suck and exhaust gas inside the processing section (91) to the outside.

[0063] The treatment gas sprayed from the treatment nozzle (93) forms a flow with directionality toward the welding area, and a longitudinal flow is formed along the inside of the treatment section (91) while lateral diffusion is restricted by the diaphragm (92), and the welding gas and welding dust are captured in the flow and transported toward the intake nozzle (94) by this flow. At this time, the welding gas and welding dust first form a stepwise flow in which they are captured in the flow by mixing with the treatment gas, and then transported toward the intake nozzle (94) by the formed flow.

[0064] This structure forms a flow control mechanism that controls the diffusion path of welding by-products to suppress external scattering and improves capture efficiency within the local flow field.

[0065] Meanwhile, an auxiliary plate perpendicular to the plate (92) may be additionally installed inside the processing section (91), and the auxiliary plate may be installed on the carriage (50) and moved together with the welding torch section (71), and may be installed as a pair at the front and rear based on the direction of movement of the welding torch section (71) to block the processing gas from moving along the length of the flange plate (1).

[0066] In addition, the above-mentioned treatment gas is formed with a composition comprising 45 to 80 parts by weight of argon (Ar), 5 to 25 parts by weight of helium (He), 2 to 20 parts by weight of carbon dioxide (CO₂), 0.1 to 5 parts by weight of sodium bicarbonate (NaHCO₃), 0.01 to 2 parts by weight of silicon-based fine particles (SiO₂ Fine Particle), 0.01 to 2 parts by weight of alumina fine particles (Al₂O₃ Fine Particle), 0.01 to 1 part by weight of borate compound, and 0.01 to 1 part by weight of polyvinyl alcohol (PVA) fine particles.

[0067] Under the flow structure within the treatment compartment (91), each component of the above-mentioned treatment gas induces a change in the state of the welding byproduct through physicochemical interactions. Argon (Ar) and helium (He) form an inert atmosphere to provide a stable gaseous environment, carbon dioxide (CO₂) increases the gas density to increase the flow residence time, and sodium bicarbonate (NaHCO₃) decomposes due to welding heat to generate fine particles. The generated fine particles increase the particle size through collision and adhesion with welding dust along with silicon-based fine particles (SiO₂ Fine Particle) and alumina fine particles (Al₂O₃ Fine Particle), borate compounds act as a medium to increase the bonding force between particles, and polyvinyl alcohol (PVA) fine particles are converted into an adhesive bonding medium by heat to further promote particle aggregation.

[0068] Through this combined action, the welding gas and welding dust are converted from a fine particle state to an aggregated particle state, and as a result, a structure is formed in which they are more stably captured within the flow and discharged through the intake nozzle (94).

[0069] In addition, the range of 45 to 80 parts by weight of argon (Ar) in the above-mentioned treatment gas is intended to stably form an inert atmosphere within the treatment compartment (91) while occupying the main volume of the total gas composition to suppress the mixing of external air. If it is less than 45 parts by weight, the flow environment may become unstable due to the inflow of external air, and if it exceeds 80 parts by weight, the mixing ratio of other components decreases relatively, and there is a limitation in that it is difficult to sufficiently exhibit the particle aggregation and collection functions.

[0070] The above range of 5 to 25 parts by weight of helium (He) is intended to ensure the diffusivity of the flow within the treatment compartment (91) and to mitigate the temperature gradient due to low density and high thermal conductivity characteristics. If less than 5 parts by weight, the effect of flow homogenization becomes weak, and if more than 25 parts by weight, the total gas density becomes excessively low, which may cause a problem of reduced residence time of the welding byproduct.

[0071] The above range of 2 to 20 parts by weight of carbon dioxide (CO₂) is intended to increase gas density to secure residence time within the treatment compartment (91) and to suppress the rise in buoyancy of the welding gas. If less than 2 parts by weight, the residence effect is not sufficiently secured, and if more than 20 parts by weight, smooth flow in the direction of the intake nozzle (94) may be hindered due to increased gas viscosity and increased flow resistance.

[0072] The above range of 0.1 to 5 parts by weight of sodium bicarbonate (NaHCO₃) is intended to prevent a state of super-saturation of aggregation caused by excessive generation and to ensure that fine particles generated by decomposition due to welding heat can act as aggregation nuclei. If the amount is less than 0.1 parts by weight, it is difficult to form significant aggregation nuclei, and if it exceeds 5 parts by weight, the excessive generation of particles leads to excessive particle collisions within the flow, which may actually increase the possibility of re-entrainment.

[0073] The range of 0.01 to 2 parts by weight of silicon-based fine particles (SiO₂ Fine Particle) and 0.01 to 2 parts by weight of alumina fine particles (Al₂O₃ Fine Particle) is intended to act as a physical bonding medium that induces particle growth through collision and adhesion with welding dust. If the amount is less than 0.01 parts by weight, the particle bonding effect is weak, and if it exceeds 2 parts by weight, the frequency of collisions between particles increases, which may reduce the stability of the aggregated particles.

[0074] The range of 0.01 to 1 weight part of the above borate compound is intended to act as a medium that increases the bonding force on the particle surface; if it is less than 0.01 weight part, the bonding promoting effect is insufficient, and if it exceeds 1 weight part, it may be excessively distributed on the particle surface, and the adhesive balance may be disrupted.

[0075] The above range of 0.01 to 1 weight part of polyvinyl alcohol (PVA) microparticles is intended to promote particle aggregation by acting as a bonding medium that has adhesive properties while being softened or partially carbonized by heat. If the amount is less than 0.01 weight part, the adhesive bonding effect is not sufficiently expressed, and if it exceeds 1 weight part, the aggregation between particles proceeds unevenly due to excessive adhesion, which may reduce mobility within the flow.

[0076] As such, the weight range of each component is set so that the balance of gas flow characteristics, particle generation, aggregation, and movement is simultaneously maintained within the treatment compartment (91). If each component falls outside the above range, the individual action is not sufficiently expressed or the balance of interactions collapses, resulting in critical characteristics that make it difficult to stably collect and discharge welding by-products.

[0077] As described above, the detailed description of the present invention has explained the most preferred embodiment of the present invention, but various modifications are possible within the scope of the technical scope of the present invention. Accordingly, the scope of protection of the present invention should not be limited to the above embodiment, but should be recognized to include the technologies of the claims described below and equivalent technical means derived from these technologies. Explanation of the symbols

[0079] 10: Support jig part 20: Support arm 30: Center body part 40: Rail arm 50: Carriage 60: Horizontal rail 70: Torch support 80: Centering module 90: By-product Treatment Department

Claims

Claim 1 A welding carriage for a ship for producing a T-bar by welding a web plate (2) to a flange plate (1), comprising: a support jig part (10) formed in an L-shape to be constrained on two sides of the corners in the width direction of the flange plate; a pair of support arms (20) installed longitudinally on the support jig part (10) and provided in parallel; a center body part (30) installed on the upper part of the support arms (20) and provided to adjust the spacing between the pair of support arms (20); a rail arm (40) installed on the lower part of the center body part (30); a carriage (50) provided with a plurality of transfer rollers (51) to move along the rail arm (40) in the length direction of the flange plate; and a transverse rail (60) installed transversely on the carriage (50). A T-bar welding device for a ship, characterized by comprising: a torch support (70) which is installed at each end of the horizontal rail (60), moves in opposite directions along the horizontal rail (60), and has a welding torch part (71) at the bottom so as to approach the joining position with the web plate (2) based on the centerline in the width direction of the flange plate (1). Claim 2 In claim 1, the center body portion (30) comprises a guide body (34) which is positioned to correspond to the width direction center of the flange plate (1) and has first and second rack guide holes (31)(31') and first and second rod holes (32)(32') formed parallel to each other in the transverse direction, and has a rail arm (40) installed at the bottom; first and second racks (35)(35') which are respectively inserted into the first and second rack guide holes (31)(31') and are respectively connected to a pair of support arms (20); a pinion (36) which is installed within the guide body (34), engages with the first and second racks (35)(35'), and is configured to linearly move the first and second racks (35)(35') in mutually opposite directions by rotational movement; and one which is respectively inserted into the first and second rod holes (32)(32'). A T-bar welding device for ships, characterized by including first and second rods (37)(37') respectively connected to a pair of support arms (20), and configured such that the first and second racks (35)(35') and the first and second rods (37)(37') are moved in opposite directions by the same amount of transport by the rotation of the pinion (36), thereby allowing the pair of support arms (20) to maintain a symmetrical position with respect to the centerline in the width direction of the flange plate (1) while adjusting the spacing. Claim 3 In claim 2, a centering module (80) is provided that is installed on the carriage (50) and supports the web plate (2) in an upright state, and the centering module (80) includes a horizontal upright rail (81) installed at the bottom of the carriage (50), a pair of upright arms (83) that are installed to be movable in the horizontal direction along the horizontal upright rail (81), are fixed in position by a fixing member (82), and are positioned opposite each other on both sides of the web plate (2), and upright rollers (84) that are installed on the upright arms (83) and move along both sides of the web plate (2), and the position of the upright arms (83) is adjusted so that the pair of upright rollers (84) are in close contact with both sides of the web plate (2) positioned on the centerline in the width direction of the flange plate (1), and while the carriage (50) moves in the length direction of the flange plate (1) and a welding process is performed by the welding torch part (71), a pair A T-bar welding device for ships, characterized in that the standing roller (84) is provided to guide the web plate (2) so that it moves along both sides of the web plate (2) and is positioned at the center of the width direction of the flange plate (1). Claim 4 In claim 3, a moving module (21) is installed on the support arm (20), and the moving module (21) includes a lift arm (21a) that extends and retracts in the longitudinal direction, including a screw rod installed on the support arm (20) and formed to vary in length by rotation, and a wheel (21b) rotatably installed on the lower part of the lift arm (21a). When the lift arm (21a) extends downward by the rotation of the screw rod, the wheel (21b) comes into contact with the floor surface and the support arm (20) rises so that the support jig part (10) is separated from the flange plate (1). When the lift arm (21a) contracts upward, the wheel (21b) separates from the floor surface and the support arm (20) lowers so that the support jig part (10) comes into contact with the two sides of the width direction corners of the flange plate (1) so as to be constrained on two sides by the moving module (21). A T-bar welding device for ships, characterized in that it is configured to selectively switch between a welding state in which the support jig part (10) is directly supported on the flange plate (1) and a moving state in which the wheel (21b) is supported on the bottom surface. Claim 5 In claim 3, a byproduct treatment unit (90) for treating welding byproducts including welding gas generated during the welding process performed by the welding torch unit (71) is provided, and the byproduct treatment unit (90) includes a partition plate (92) connected to the support jig unit (10) and arranged along the longitudinal direction at the upper surface of the flange plate (1) and spaced apart from one side of the web plate (2) to form a treatment section (91) together with the upper surface of the flange plate (1), a treatment nozzle (93) installed on the torch support (70) and configured to spray treatment gas toward the welding area where the flange plate (1) and the web plate (2) come into contact, and an intake nozzle (94) installed on the partition plate (92) and located at the other end of the treatment section (91) and configured to suck and exhaust gas inside the treatment section (91) to the outside, and the treatment gas sprayed from the treatment nozzle (93) is the A T-bar welding device for ships, characterized by being configured to collect welding by-products containing welding gas while flowing through the welding area within the processing section (91) and transferring them to the intake nozzle (94). Claim 6 A T-bar welding device for ships according to claim 5, wherein the treatment gas comprises 45 to 80 parts by weight of argon (Ar), 5 to 25 parts by weight of helium (He), 2 to 20 parts by weight of carbon dioxide (CO₂), 0.1 to 5 parts by weight of sodium bicarbonate (NaHCO₃), 0.01 to 2 parts by weight of silicon-based fine particles (SiO₂ Fine Particle), 0.01 to 2 parts by weight of alumina fine particles (Al₂O₃ Fine Particle), 0.01 to 1 part by weight of borate compound, and 0.01 to 1 part by weight of polyvinyl alcohol (PVA) fine particles.

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