WO2024090305A1 - Procédé de fabrication de réservoir - Google Patents

Procédé de fabrication de réservoir Download PDF

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Publication number
WO2024090305A1
WO2024090305A1 PCT/JP2023/037696 JP2023037696W WO2024090305A1 WO 2024090305 A1 WO2024090305 A1 WO 2024090305A1 JP 2023037696 W JP2023037696 W JP 2023037696W WO 2024090305 A1 WO2024090305 A1 WO 2024090305A1
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WO
WIPO (PCT)
Prior art keywords
layer
welded
welding
welded layer
tank
Prior art date
Application number
PCT/JP2023/037696
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English (en)
Japanese (ja)
Inventor
亨尚 渡部
俊之 久保
Original Assignee
三菱造船株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱造船株式会社 filed Critical 三菱造船株式会社
Publication of WO2024090305A1 publication Critical patent/WO2024090305A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/08—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for flash removal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/04—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of metal, e.g. skate blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/02—Large containers rigid
    • B65D88/06—Large containers rigid cylindrical

Definitions

  • the present disclosure relates to a method for manufacturing a tank.
  • This application claims priority to Japanese Patent Application No. 2022-170369, filed in Japan on October 25, 2022, the contents of which are incorporated herein by reference.
  • Patent Document 1 discloses a configuration in which a modified layer with improved toughness is formed between the front weld layer and the back weld layer of a multi-layer butt welded joint of steel plates by applying compressive residual stress through ultrasonic impact treatment.
  • the present disclosure has been made to solve the above problems, and aims to provide a method for manufacturing a tank that can increase toughness more uniformly throughout the entire weld.
  • the method of manufacturing a tank according to the present disclosure is a method of manufacturing a tank by joint-welding steel plates that constitute the tank.
  • the method of manufacturing the tank includes a step of performing welding and a step of removing a part of the surface layer of a lower weld layer.
  • the step of performing welding is performed such that a plurality of weld layers are sequentially stacked between the ends of the opposing plates toward the surface side of the plates.
  • the step of removing a part of the surface layer of a lower weld layer removes a part of the surface layer of a lower weld layer before the upper weld layer is stacked on the lower weld layer.
  • the tank manufacturing method disclosed herein allows for more uniform toughness to be achieved throughout the entire weld.
  • FIG. 1 is a cross-sectional view of a tank manufactured by a tank manufacturing method according to an embodiment of the present disclosure.
  • FIG. 2 is a cross-sectional view showing a weld between steel tank plate materials constituting a tank according to an embodiment of the present disclosure.
  • 4 is a flowchart showing the steps of a method for manufacturing a tank according to an embodiment of the present disclosure.
  • 10A to 10C are diagrams illustrating a process of obtaining a reheating range in a welded layer and a process of setting a range for removing a part of a surface layer of the welded layer in a method for manufacturing a tank according to an embodiment of the present disclosure.
  • FIG. 13 is a diagram showing a state in which a first welded layer has been formed by a welding process according to an embodiment of the present disclosure.
  • 1 is a diagram showing a state in which a portion of a surface layer portion of a first welded layer has been removed by a step of removing a portion of a surface layer portion of a lower welded layer according to an embodiment of the present disclosure.
  • FIG. FIG. 11 is a diagram showing a state in which a second welded layer has been formed by a welding process according to an embodiment of the present disclosure.
  • FIG. 1 is a diagram showing a state in which a portion of a surface layer portion of a second welded layer has been removed by a step of removing a portion of a surface layer portion of a lower welded layer according to an embodiment of the present disclosure.
  • FIG. 11 is a diagram showing a state in which an outermost welded layer has been formed by a step of forming an outermost welded layer according to an embodiment of the present disclosure.
  • the tank 1 of this embodiment is a tank capable of storing liquefied gas such as liquefied carbon dioxide.
  • the tank 1 is installed in the hull of a ship, the floating body of an offshore floating facility, a liquefied gas storage facility on land, or the like.
  • the tank 1 illustrated in this embodiment is cylindrical.
  • the tank 1 includes a tubular portion 2 and a head plate portion 3.
  • the tubular portion 2 extends in its central axis direction Dc.
  • the tubular portion 2 is formed in a cylindrical shape, and the cross-sectional shape perpendicular to the central axis direction Dc is circular.
  • the head plate portions 3 are disposed at both ends of the tubular portion 2 in the central axis direction Dc.
  • Each head plate portion 3 has a spherical shape such as a hemisphere, and closes an opening in the central axis direction Dc of the tubular portion 2.
  • the tank 1 is not limited to a cylindrical shape, and may be other shapes such as a spherical shape or a rectangular shape.
  • FIG. 2 is a cross-sectional view showing a weld between steel plates constituting a tank according to an embodiment of the present disclosure.
  • the tank 1 is formed by joint-welding a plurality of steel plates 20.
  • the plates 20 constituting the tank 1 are formed of a metal material such as high-strength tempered steel.
  • the thickness of the plate 20 in the plate thickness direction Dt is, for example, about 10 to 100 mm.
  • the plate materials 20 have a groove portion 21V with a V-shaped cross section, which is a V-shaped groove.
  • the ends 20a of the plate materials 20 facing each other have an inclined surface 20s.
  • the inclined surfaces 20s of the plate materials 20 facing each other are formed so that the distance between them in the facing direction Da of the plate materials 20 gradually decreases from the surface 20f of the first side Dt1 in the plate thickness direction Dt to the surface 20g of the second side Dt2 in the plate thickness direction Dt.
  • the groove portion 21V extends in a direction perpendicular to the facing direction Da of the plate materials 20 and the plate thickness direction Dt of the plate materials 20 (a direction perpendicular to the paper surface of FIG. 2).
  • the ends 20a of the opposing plate materials 20 are joined together via a weld 30.
  • the weld 30 is formed between the ends 20a of the plate materials 20.
  • the weld 30 is formed by multi-layer welding. In multi-layer welding, the weld 30 is formed between the ends 20a of the opposing plate materials 20 by repeating welding multiple times. Multi-layer welding is suitable for reducing the amount of heat input to the plate material 20 during each welding.
  • the welded portion 30 has a plurality of welded layers 31.
  • six welded layers 311 to 316 are formed as the welded layers 31 of the welded portion 30 (see FIG. 9). Note that in FIG. 2, only five welded layers 311 to 315 out of the six welded layers 311 to 316 are illustrated.
  • the welded layers 311 to 316 are stacked in order from the second side Dt2 in the plate thickness direction Dt toward the surface 20f of the first side Dt1 in the plate thickness direction Dt. Note that the number of layers of the plurality of welded layers 31 is set depending on the plate thickness of the plate material 20, etc., and can be changed as appropriate. A portion of the surface layer 31a of each of the welded layers 311 to 315 is removed, as will be described in detail later.
  • FIG. 3 is a flowchart showing the procedure of the method for manufacturing a tank according to an embodiment of the present disclosure.
  • Fig. 4 is a diagram showing a schematic diagram of a process for obtaining a reheating range in a welded layer and a process for setting a range for removing a part of a surface layer of the welded layer in the method for manufacturing a tank according to an embodiment of the present disclosure. As shown in FIG.
  • the manufacturing method S10 of the tank 1 includes a step S11 of obtaining a reheat range in the welded layer, a step S12 of setting a range for removing a portion of the surface layer of the welded layer, a step S13 of performing welding, a step S14 of removing a portion of the surface layer of the lower welded layer, a step S15 of forming the outermost welded layer, and a step S16 of removing at least a portion of the outermost welded layer.
  • step S11 of acquiring the reheat range in the welded layer the reheat range in the lower welded layer 31 is acquired.
  • step S13 of performing welding which will be described later, welding is repeated multiple times from the second side Dt2 toward the first side Dt1 in the plate thickness direction Dt to sequentially stack and form the welded layers 311-315 and the outermost welded layer 316.
  • the lower welded layer 31 which is formed first, receives welding heat when welding the upper welded layer 31 later.
  • step S11 of acquiring the reheat range in this welded layer as shown in FIG.
  • the reheat range A in the lower welded layer 31A due to the heat input from the upper welded layer 31B is acquired. That is, the heat input from the upper welded layer 31B does not necessarily extend to the entire lower welded layer 31A, but the area of the lower welded layer 31A that extends from the part that contacts (actually, partially overlaps) with the upper welded layer 31B is taken as reheat area A.
  • Reheat area A is the area where the toughness of the lower welded layer 31A is increased by the heat input from the upper welded layer 31B, and it recovers to a preset standard or higher.
  • step S12 the range for removing a part of the surface layer of the welded layer is set based on the reheat range A acquired in step S11 for acquiring the reheat range in the welded layer.
  • the part of the surface layer 31a of the lower welded layer 31 is removed in step S14 for removing a part of the surface layer of the lower welded layer, which will be described later in detail.
  • the range for removing the part of the surface layer 31a of the lower welded layer 31 is set so that the toughness of the entire lower welded layer 31 remaining after removing this range is increased (recovered) to a standard level by the heat input from the upper welded layer 31B.
  • the range for removing the part of the surface layer 31a of the lower welded layer 31 is set by the thickness T in the plate thickness direction Dt of the range B other than the reheat range A in the lower welded layer 31.
  • the removal of the surface layer 31a can be performed, for example, by cutting using a tool such as a disc grinder.
  • welding is performed between the ends 20a of the opposing plate materials 20. Specifically, welding is performed from the second side Dt2 in the plate thickness direction Dt between the inclined surfaces 20s of the opposing plate materials 20 in the direction in which the welded portion 30 extends (the direction perpendicular to the paper surface in FIG. 2).
  • process S14 for removing a portion of the surface portion of the lower welding layer a portion of the surface portion 31a of the lower welding layer 31 is removed before the upper welding layer 31 is laminated on the lower welding layer 31.
  • the welding layer 31 formed by welding in process S13 for performing welding is regarded as the lower welding layer 31.
  • a portion of the surface portion 31a of the lower welding layer 31 is removed based on the dimension T set in process S12 for setting the range for removing the portion of the surface portion of the welding layer.
  • a grinder for example, is used to remove the portion of the surface portion 31a of the lower welding layer 31.
  • the above-mentioned welding process S13 and process S14 of removing part of the surface of the lower welded layer are repeated a predetermined number of times to form the welded layers 311 to 315 in sequence.
  • Fig. 5 is a diagram showing a state in which a first welded layer is formed by a step of performing welding according to an embodiment of the present disclosure
  • Fig. 6 is a diagram showing a state in which a part of a surface layer portion of a first welded layer is removed by a step of removing a part of a surface layer portion of a lower welded layer according to an embodiment of the present disclosure.
  • a welding step S13 welding is performed between the ends 20a of the opposing plate materials 20 at a position on the second side Dt2 in the plate thickness direction Dt to form a first welded layer 311.
  • a welding step S13 welding is performed between the ends 20a of the opposing plate materials 20 at a position on the second side Dt2 in the plate thickness direction Dt to form a first welded layer 311.
  • Fig. 5 is a diagram showing a state in which a first welded layer is formed by a step of performing welding according to an embodiment of the present disclosure
  • Fig. 6 is a diagram
  • a part of the surface layer portion 31a of the first welded layer 311 is removed by a dimension T before a second welded layer 312 (corresponding to the upper welded layer 31) is laminated on the first welded layer 311 (corresponding to the lower welded layer 31).
  • Fig. 7 is a diagram showing a state in which a second welded layer is formed by a step of performing welding according to an embodiment of the present disclosure
  • Fig. 8 is a diagram showing a state in which a part of a surface layer portion of the second welded layer is removed by a step of removing a part of a surface layer portion of a lower welded layer according to an embodiment of the present disclosure.
  • a welding step S13 welding is performed between the ends 20a of the opposing plate materials 20 such that a second welded layer 312 (corresponding to the upper welded layer 31) is laminated on a first side Dt1 in the plate thickness direction Dt with respect to a first welded layer 311 (corresponding to the lower welded layer 31).
  • the first welded layer 311 is reheated by the heat input when welding the second welded layer 312. A part of the surface layer 31a of the first welded layer 311 has been removed. Therefore, the heat input from the second welded layer 312 increases (in other words, recovers) the overall toughness of the first welded layer 311 from which a part of the surface layer 31a has been removed.
  • step S14 which removes a portion of the surface of the lower welded layer, a portion of the surface 31a of the second welded layer 311 is removed by a dimension T before the third welded layer 313 (corresponding to the upper welded layer 31) is laminated on the second welded layer 312 (corresponding to the lower welded layer 31).
  • the third welded layer 313 to the fifth welded layer 315 are stacked in sequence by repeating the process S13 of welding and the process S14 of removing part of the surface of the lower welded layer in the same manner.
  • FIG. 9 is a diagram showing a state in which an outermost welded layer is formed by the step of forming an outermost welded layer according to an embodiment of the present disclosure.
  • a sixth welded layer 316 located closest to the first side Dt1 (closest to the surface 20f) in the plate thickness direction Dt is formed by welding so as to be laminated on the fifth welded layer 315.
  • the outermost welded layer 316 located closest to the first side Dt1 (closest to the surface 20f) in the plate thickness direction Dt is formed so as to rise from the surface 20f to the first side Dt1 in the plate thickness direction Dt.
  • step S16 of removing at least a part of the outermost welded layer at least a part of the welded layer 31 located closest to the surface 20f of the plate material 20 is removed.
  • the welded layers 311 to 314 have their toughness restored and their residual stress alleviated by the heat input when the other welded layers 31 are formed later.
  • the welded layer 315 has their toughness restored and their residual stress alleviated by the heat input when the outermost welded layer 316 is formed later.
  • the outermost welded layer 316 formed last on the first side Dt1 in the plate thickness direction Dt has residual stress. Therefore, at least a part of the outermost welded layer 316 located closest to the surface 20f of the plate material 20 is removed.
  • FIG. 2 illustrates a case in which all of the welded layer 316 is removed.
  • the plate materials 20 in this embodiment are joined together.
  • a welded portion 30 in which a plurality of weld layers 31 are stacked is formed between the ends 20a of the plate materials 20 that face each other.
  • the entire welded portion 30 is finally reheated by the heat input from the upper welded layer 31, and the toughness is increased.
  • the toughness can be increased more uniformly throughout the entire welded portion 30.
  • the residual stress in the welded portion 30 can also be reduced.
  • the lower welded layer 31 from which part of the surface layer 31a has been removed is reheated by heat input from the upper welded layer 31, thereby reheating the entire lower welded layer 31.
  • the reheat range A due to the heat input from the upper welded layer 31 extends to the entire lower welded layer 31 after removing part of the surface layer 31a, thereby improving the overall toughness of the lower welded layer 31.
  • the reheat range A in the lower welding layer 31 due to the heat input from the upper welding layer 31 is acquired. This makes it possible to appropriately set the range in which the part of the surface layer 31a of the lower welding layer 31 is removed so that the heat input from the upper welding layer 31 covers the entire lower welding layer 31 after the part of the surface layer 31a has been removed.
  • the portion of the welded layer 316 located on the surface 20f side that has not been reheated can be removed, and residual stress can be locally reduced.
  • the groove portion 21V has a V-shaped cross section, but is not limited thereto.
  • the groove portion may have an X-shaped cross section.
  • a manufacturing method of the tank 1 described in the embodiment can be understood, for example, as follows.
  • a manufacturing method of a tank 1 according to a first aspect is a manufacturing method of a tank 1 for manufacturing the tank 1 by joint-welding steel plates 20 constituting the tank 1, the manufacturing method including a step S13 of welding between the ends 20a of the plates 20 facing each other so that a plurality of welded layers 31 are sequentially stacked toward the surface 20f side of the plates 20, and a step S14 of removing a part of the surface layer 31a of the lower welded layer 31 before the upper welded layer 31 is stacked on the lower welded layer 31. including.
  • the manufacturing method of the tank 1 according to the second aspect is the manufacturing method of the tank 1 according to (1), and in the welding step S13, when the upper welding layer 31 is laminated to the lower welding layer 31 by welding, the lower welding layer 31 from which a part of the surface layer 31a has been removed is reheated by the heat input from the upper welding layer 31.
  • the manufacturing method of the tank 1 according to the third aspect is the manufacturing method of the tank 1 according to (1) or (2), and in step S14 of removing a portion of the surface layer 31a of the lower welded layer 31, the portion of the surface layer 31a of the lower welded layer 31 is removed so that when the upper welded layer 31 is laminated on the lower welded layer 31, the reheat range A due to the heat input from the upper welded layer 31 covers the entire lower welded layer 31 after the portion of the surface layer 31a has been removed.
  • the reheat range A due to the heat input from the upper welded layer 31 extends to the entire lower welded layer 31 after part of the surface layer 31a has been removed, thereby increasing the overall toughness of the lower welded layer 31.
  • the manufacturing method of the tank 1 according to the fourth aspect is a manufacturing method of the tank 1 according to any one of (1) to (3), and further includes a step S11 of acquiring a reheating range A in the lower welded layer 31 due to heat input from the upper welded layer 31 when the upper welded layer 31 is laminated on the lower welded layer 31, and a step S12 of setting a range for removing a portion of the surface layer 31a of the lower welded layer 31 based on the reheating range A acquired in the step S11 of acquiring the reheating range A, in a step S14 of removing a portion of the surface layer 31a of the lower welded layer 31.
  • the manufacturing method of the tank 1 according to the fifth aspect is any one of the manufacturing methods of the tank 1 according to (1) to (4), in which at least a portion of the welded layer 316, which is located closest to the surface 20f of the plate material 20, among the multiple welded layers 31, is removed.
  • the portion of the welded layer 316 located on the surface 20f side that has not been reheated can be removed, and residual stress can be locally reduced.
  • the tank manufacturing method disclosed herein allows for more uniform toughness to be achieved throughout the entire weld.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

L'invention concerne un procédé de fabrication de réservoir, selon lequel un réservoir est fabriqué par soudage de joint de plaques en acier configurant le réservoir. Le procédé de l'invention inclut : une étape au cours de laquelle un soudage est effectué entre l'une et l'autre partie extrémité des plaques en vis-à-vis l'une par rapport à l'autre, de sorte qu'une pluralité de couches de soudure se stratifie successivement vers un côté surface des plaques ; et une étape au cours de laquelle avant stratification d'une couche de soudure supérieure sur une couche de soudure inférieure, une partie couche superficielle de la couche de soudure inférieure, est partiellement retirée.
PCT/JP2023/037696 2022-10-25 2023-10-18 Procédé de fabrication de réservoir WO2024090305A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022170369A JP2024062503A (ja) 2022-10-25 2022-10-25 タンクの製造方法
JP2022-170369 2022-10-25

Publications (1)

Publication Number Publication Date
WO2024090305A1 true WO2024090305A1 (fr) 2024-05-02

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JP (1) JP2024062503A (fr)
WO (1) WO2024090305A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09216095A (ja) * 1996-02-08 1997-08-19 Nippon Steel Weld Prod & Eng Co Ltd 溶接スラグ自動除去装置
JP2008068274A (ja) * 2006-09-12 2008-03-27 Kobe Steel Ltd 低温靭性に優れた高強度溶接金属
JP2011056539A (ja) * 2009-09-09 2011-03-24 Kobe Steel Ltd 溶接ソリッドワイヤおよび溶接金属

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09216095A (ja) * 1996-02-08 1997-08-19 Nippon Steel Weld Prod & Eng Co Ltd 溶接スラグ自動除去装置
JP2008068274A (ja) * 2006-09-12 2008-03-27 Kobe Steel Ltd 低温靭性に優れた高強度溶接金属
JP2011056539A (ja) * 2009-09-09 2011-03-24 Kobe Steel Ltd 溶接ソリッドワイヤおよび溶接金属

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