WO2020090939A1 - Tuyau en acier carré et procédé de soudage de tuyau en acier carré - Google Patents

Tuyau en acier carré et procédé de soudage de tuyau en acier carré Download PDF

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Publication number
WO2020090939A1
WO2020090939A1 PCT/JP2019/042691 JP2019042691W WO2020090939A1 WO 2020090939 A1 WO2020090939 A1 WO 2020090939A1 JP 2019042691 W JP2019042691 W JP 2019042691W WO 2020090939 A1 WO2020090939 A1 WO 2020090939A1
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WIPO (PCT)
Prior art keywords
steel pipe
material layer
welding
rectangular steel
yield point
Prior art date
Application number
PCT/JP2019/042691
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English (en)
Japanese (ja)
Inventor
毅 萩野
前嶋　匡
佐藤　誠
Original Assignee
旭化成建材株式会社
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 旭化成建材株式会社 filed Critical 旭化成建材株式会社
Priority to KR1020217012479A priority Critical patent/KR102485533B1/ko
Priority to JP2020554009A priority patent/JP7252249B2/ja
Publication of WO2020090939A1 publication Critical patent/WO2020090939A1/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
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • 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
    • B23K37/06—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for positioning the molten material, e.g. confining it to a desired area
    • 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
    • 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
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
    • 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
    • B23K9/18—Submerged-arc welding
    • 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
    • B23K9/18—Submerged-arc welding
    • B23K9/186—Submerged-arc welding making use of a consumable electrodes
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/58—Connections for building structures in general of bar-shaped building elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • E04C3/32—Columns; Pillars; Struts of metal
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles

Definitions

  • the present invention relates to a square steel pipe and a method for welding a square steel pipe.
  • the diaphragm type for example, through diaphragm type, inner diaphragm type, outer diaphragm type, etc.
  • a non-diaphragm type column-beam joint structure has been adopted in which a H-shaped steel can be directly welded to the pipe wall surface by using a column-beam joint core made of a short, thick rectangular steel pipe without providing this diaphragm.
  • Patent Document 1 As the thick-walled rectangular steel pipe applied to the above non-diaphragm type beam-column joint structure, for example, it is known that cast steel or shaped steel is welded.
  • Patent Document 1 four rectangular steel plates are combined in a box shape, and side edge portions of the steel plates are welded to each other to form a thick-walled rectangular steel pipe having a quadrangular shape in cross section.
  • four steel plates with the groove formed on both side edges are arranged in a box shape, the side edges of the respective steel sheets are adjacent to each other, and a welding torch is arranged between the side edges, respectively.
  • Patent Document 1 describes a method in which a torch is moved upward from below the steel sheet and the side edges of the steel sheet are welded at the same time.
  • the thick-walled square steel pipe applied to the non-diaphragm type beam-column joint structure has a structure in which the H-section steel is directly joined to the side surface thereof as described above, and therefore has a strength capable of withstanding such a structure. Desired.
  • a thick-walled rectangular steel pipe is constructed by welding the side edge portions of the steel sheets to each other as in Patent Document 1, stress is likely to concentrate particularly on the joint portion, and the strength as designed can be obtained. Sometimes there is not.
  • Patent Document 1 describes that the work efficiency is improved by simultaneously welding the side edge portions of each steel sheet, it is possible to improve the strength of the thick-walled rectangular steel pipe formed by welding. Was not considered and needed improvement.
  • an object of the present invention is to provide a technique capable of improving the strength of a square steel pipe used for a beam-column joint structure.
  • a square steel pipe is a square steel pipe used for a column-beam joint portion between a column and a beam, and is a welded joint formed by welding a plurality of steel plates and side edges of the steel plates. It is a steel pipe having a quadrangular cross-sectional view and a welded part has a multilayer structure in which different kinds of materials are laminated, and the yield point of the material forming the inner material layer located inside the multilayer is It is higher than the yield point of the material forming the outer material layer located on the outer side.
  • FIG. 1 shows a main part of a steel frame structure that adopts this non-diaphragm type beam-column joint structure.
  • FIG. 1 shows a main part of a steel frame structure that adopts a non-diaphragm type beam-column joint structure, but the beam-column joint structure in the present embodiment is not limited to this mode, and for example, a thick-walled prism A mode in which a hole is opened in the steel pipe 30 and the beam 20 is bolted is also included.
  • a column-beam joint structure 1 includes upper and lower rectangular steel pipe columns 10a and 10b extending in the vertical direction and a thick-walled rectangular steel pipe disposed between the upper and lower square steel pipe columns 10a and 10b. 30 (square steel pipe), and a beam 20 whose one end is fixed to the side surface of the thick-walled square steel pipe 30 and which is extended in the horizontal direction.
  • the beam 20 is made of H-shaped steel, and is composed of two flat plate-like flanges 20a facing each other and a web 20b formed between the facing flanges 20a.
  • the beam 20 is welded to the thick-walled rectangular steel pipe 30 such that the flanges 20a are vertically opposed to each other and one end surface of the web 20b is in contact with the side surface of the thick-walled rectangular steel pipe 30.
  • the square steel pipe pillars 10a and 10b are long pillar steel pipes that are pillars of the steel frame structure and have a substantially square cross section.
  • the lower end of the thick-walled rectangular steel pipe 30 is joined to the upper end of the rectangular steel pipe column 10b (lower floor column) extending to the lower side, and the thick-walled prism is attached to the lower end of the rectangular steel pipe column 10a (upper column) extending to the upper side.
  • the upper end of the steel pipe 30 is joined.
  • square steel pipe columns 10a and 10b are not individually distinguished and are collectively expressed, they are simply referred to as "square steel pipe columns 10".
  • the thick-walled rectangular steel pipe 30 is a short rectangular steel pipe having a substantially quadrangular shape in cross section, which is disposed at a connecting portion (column-beam joint portion) between the upper and lower rectangular steel pipe columns 10 and the beam 20.
  • the upper and lower rectangular steel pipe columns 10 and the thick-walled rectangular steel pipe 30 are arranged so as to be linearly positioned. Since the non-diaphragm type thick square steel pipe 30 capable of directly joining the beam 20 made of H-shaped steel to the side surface is used in the beam-column joint structure 1 in the present embodiment, the plate thickness of the thick square steel pipe 30 The t c is formed to be thicker than the plate thickness t p of the square steel tubular column 10.
  • the plate thickness t c is, for example, 22 to 50 mm, and the plate thickness t p is, for example, 6 to 25 mm.
  • the length of the thick-walled rectangular steel pipe 30 in the longitudinal direction is longer than the height of the beam 20 joined to the side surface of the thick-walled rectangular steel pipe 30 (the height between the flanges 20a).
  • FIG. 2 is a perspective view showing a schematic configuration of the thick-walled rectangular steel pipe 30.
  • FIG. 3 is a side view showing a schematic configuration of the thick-walled rectangular steel pipe 30.
  • FIG. 4 is a plan view showing a schematic configuration of the thick-walled rectangular steel pipe 30.
  • FIG. 5 is an enlarged view for explaining the weld metal 32 (weld portion) formed at the corner of the thick-walled rectangular steel pipe 30.
  • the thick-walled rectangular steel pipe 30 is formed by welding four rectangular steel plates 31a, 31a, 31b, 31b thicker than the steel pipes constituting the square steel pipe column 10 to each other by welding. It is molded by.
  • a process of welding the edges of the steel plates 31a, 31a, 31b, 31b to each other to form the weld metal 32 will be described.
  • the steel plates 31a, 31a, 31b, 31b are not individually distinguished but are collectively expressed, they are simply referred to as "steel plates 31".
  • a groove G having an inclination of a predetermined angle is formed on the side edges of the steel plates 31 arranged in a box shape adjacent to each other.
  • a groove G having an inclination of a predetermined angle is formed at both widthwise edges of the steel plates 31b, 31b arranged to face each other.
  • a predetermined welding device for example, a welding torch (not shown)
  • the steel plates 31 are arranged along the vertical direction (the vertical direction in FIG. 3) of the steel plates 31.
  • the adjacent steel plates 31 are joined by welding from one end to the other end (as shown in FIG.
  • the weld metal 32 is formed on the side edge portions (inside the corner portions of the steel plates 31) of the adjacent steel plates 31 to join the steel plates 31 to each other to manufacture a steel pipe having a substantially rectangular cross section.
  • the weld metal 32 obtained by multi-layer welding is formed in the groove G formed between the adjacent steel plates 31.
  • FIG. 5 is an enlarged view showing the periphery of the weld metal 32 in an enlarged manner.
  • the weld metal 32 is formed at the corners (near the four corners of the substantially square cross section) of the thick-walled rectangular steel pipe 30 and has a multilayer structure in which a plurality of types of materials are laminated.
  • the backing metal is provided on the groove G backside (the inner surface side of the steel sheet 31) formed between the adjacent steel sheets 31. 35 is applied and welding is performed by CO 2 semi-automatic welding to form the inner material layer 321.
  • welding is performed by submerged arc welding to form the outer material layer 322.
  • the multi-layered weld metal 32 including the inner material layer 321 and the outer material layer 322 is formed.
  • welding is performed by CO 2 semi-automatic welding to form one inner material layer 321
  • welding is performed by submerged arc welding and the outer material layer 322.
  • the material layer located on the inner side is the inner material layer.
  • the material layer located on the outer side is referred to as an outer material layer 322.
  • a high-strength material is used for the inner material layer 321 formed by welding the first layer.
  • the yield point measured according to the tensile test specified in JIS Z 2241 of the material used for the inner material layer 321 is the tensile test specified in JIS Z 2241 of the material used for the steel plate 31.
  • the yield point is higher than the yield point measured according to JIS standard and is higher than the yield point measured according to the tensile test specified in JIS Z 2241 of the material forming outer material layer 322.
  • the inner material layer 321 is a yield point is measured according to the tensile test defined in JIS Z 2241 is 460N / mm 2 or more and a tensile strength of 550 N / mm 2 or more numbers It is formed using a range of materials. Furthermore, in addition to satisfying the numerical values of the yield point and the tensile strength measured according to the tensile test specified in JIS Z 2241, the shock absorption energy in the Charpy impact test specified in JIS Z 2242 It is preferable to form the inner material layer 321 using a material of 70 J or more at 0 ° C. As the welding material used for the inner material layer 321, for example, YGW18 or the like can be adopted.
  • the welding material in the first layer should have a strength (yield point, tensile strength) higher than that of the base material, and in order to ensure that the welding material has a lower limit value higher than the upper limit value of the base material standard.
  • a strength yield point, tensile strength
  • the outer material layer 322 has a yield point of 390 N / mm 2 or more measured according to the tensile test specified in JIS Z 2241 and is compliant with the tensile test specified in JIS Z 2241 of the inner material layer 321.
  • a material having a tensile strength lower than the yield point measured and a tensile strength in the numerical range of 490 N / mm 2 or more is used.
  • As a welding material for the outer material layer 322 satisfying such a condition for example, EH12K, EH14, S502-H or the like can be adopted.
  • the yield point measured according to the tensile test specified in JIS Z 2241 is in the numerical range of 325 to 445 N / mm 2
  • the tensile strength is in the range of 490 to 610 N / mm 2 .
  • a range of steel materials is used.
  • a steel material for example, rolled steel material SN490B for building structure, TMCP steel plate TMCP325B for building structure, etc. can be adopted.
  • the inner material layer 321 formed by welding the first layer has a high-strength material (steel sheet 31, measured according to the tensile test stipulated in JIS Z 2241 of the material used for the outer material layer 322).
  • a material having a yield point higher than the yield point the joint strength of the inner side (the inner surface side of the thick rectangular steel tube 30) of the weld metal 32 formed by welding the side edge portions of the steel plate 31 can be improved.
  • the inner material layer 321 is formed to improve the inner joint strength of the weld metal 32, it is possible to enhance the proof stress against the stress concentration. Further, by using a material (for example, YGW18 or the like) whose impact absorption energy is 70 J or more at 0 ° C. in the Charpy impact test specified in JIS Z2242 described above for the inner material layer 321, the toughness can be improved. Even if the tensile stress acts, the possibility of fracture in the weld metal 32 can be suppressed. As one of preferable combinations, the inner material layer 321 can be composed of YGW18, the outer material layer 322 of S502-H, and the steel plate 31 of SN490B.
  • the inner material layer 321 made of a material having a higher yield point than the yield point measured according to the tensile test of JIS 2241 of the material used for the steel plate 31 is formed.
  • an outer material layer 322 made of a material having a lower yield point measured in accordance with a tensile test specified in JIS Z 2241 of the material of the inner material layer 321 is formed.
  • a step of performing is performed.
  • the welding voltage value and the welding current in the welding operation in the submerged arc welding are adjusted. That is, in the step of forming the outer material layer 322, only in the step of welding the outermost layer of the outer material layer 322, the welding voltage value, the welding current value, and the welding current value when welding the layers other than the outermost layer of the outer material layer 322 are welded. It is preferable to weld at different speed values.
  • the column-beam joint structure 1 or the welding method as in the present embodiment reduces the excess by suppressing the height of the excess within a predetermined value. It is possible to join a beam to a square steel pipe without any problem.
  • stress concentration occurs when a force that deforms the tube wall (steel plate) of the thick-walled rectangular steel pipe outward is transmitted from the beam at the time of an earthquake, etc.
  • the post-joining portion is designed to have higher strength than the base metal in consideration of defects due to welding (“base metal strength ⁇ welding strength”).
  • base metal strength ⁇ welding strength the strength at the post-joined portion by welding is set to “inner material layer ⁇ outer material layer” and further “inner material layer ⁇ outer material layer”.
  • the thick-walled rectangular steel pipe 30 manufactured through the above-described welding process has a backing metal 35 having a rectangular shape in plan view arranged inside the corner of the thick-walled rectangular steel pipe 30 and formed outside the backing metal 35.
  • the inclined groove G thus formed is welded to form the weld metal 32.
  • the backing metal 35 has a prismatic shape extending along the inside of the corner of the thick-walled rectangular steel tube 30, but is not limited to this shape and various other shapes. Can be changed to.
  • the backing metal 35B arranged inside the corner portion of the thick-walled rectangular steel pipe 30 into an L-shape in plan view.
  • the backing metal 35B having an L-shape in plan view shown in FIG. 6A extends from the upper end to the lower end of the thick-walled rectangular steel pipe 30 along the inside of the corner of the thick-walled rectangular steel pipe 30.
  • the backing metal 35C arranged inside the corner of the thick-walled rectangular steel tube 30 can be formed in a triangular shape in plan view.
  • the backing metal 35C having a triangular shape in plan view also extends from the upper end to the lower end of the thick-walled rectangular steel pipe 30 along the inside of the corner of the thick-walled rectangular steel pipe 30.
  • a direction in which the steel plate 31 opens due to tensile stress from the beam 20 (FIG. 1) welded to the outer side of the thick-walled rectangular steel tube 30 (broken line arrow F in FIG. 6).
  • the backing plates 35B and 35C can be easily followed. It is possible to relieve the stress concentration generated at the inner corner of the thick-walled rectangular steel pipe 30 and at the end of the gap between the backing metal 35 and the steel plate 31 on the side of the weld metal 32.
  • the groove G shape between the adjacent steel plates 31 in which the weld metal 32 is formed has a shape that widens from the inside to the outside of the thick rectangular steel tube 30.
  • the inclination angle ⁇ (FIG. 5) of the groove G shape is set in the range of 20 ° to 40 °, for example. If the inclination angle ⁇ is 40 ° or more, the welding amount increases, so that the economical efficiency decreases, and if it is 20 ° or less, it becomes difficult to secure the quality.
  • the amount of material used for the inner material layer 321 in the weld metal 32. can be suppressed.
  • the shape of the groove G formed between the adjacent steel plates 31 is the shape that widens from the inside to the outside of the thick-walled square steel pipe 30 is shown.
  • the groove shape is not limited to such a groove shape, and the groove shape can be transformed into various other shapes.
  • the side edges of four flat steel plates 31 are welded and joined to each other to manufacture the thick-walled rectangular steel pipe 30 having a substantially quadrangular cross-sectional shape. It is not limited to manufacturing the thick-walled rectangular steel pipe 30 using the flat plate-shaped steel plate 31.
  • FIG. 7 (A) a cross section in which two steel plates 31d having a substantially L-shape in plan view are used and the groove Gd between the edges of the steel plate 31d is welded to be welded metal 32d. It is also possible to manufacture the thick-walled rectangular steel pipe 30D having a substantially rectangular shape as viewed. Further, as shown in FIG. 7B, two steel plates 31e having a substantially U-shape in plan view are used, and the groove Ge between the edges of the steel plate 31e is welded to be welded metal 32e. It is also possible to manufacture the thick-walled rectangular steel pipe 30E having a substantially square cross section. Further, as shown in FIG.
  • a thick rectangular steel tube 30F may be formed by combining an H-shaped steel 31f and two flat steel plates 31g. Specifically, first, an H-section steel 31f including two flat plate-shaped flanges 31f1 facing each other and a web 31f2 formed between the facing flanges 31f1 is prepared. In the H-shaped steel 31f, a flat plate-shaped steel plate 31g having grooves Gf formed at both widthwise edges is arranged so as to connect between the facing flanges 31f1. The groove Gf formed at both edges of the steel plate 31g is welded to form a weld metal 32f, and the flange 31f1 of the H-shaped steel 31f and the steel plate 31g are joined. In this way, it is also possible to manufacture the thick-walled rectangular steel pipe 30F (that is, a rectangular steel pipe having a quadrangular cross-section) by combining the H-shaped steel 31f and the steel plate 31g with each other.
  • the thick-walled rectangular steel pipe 30F that is, a
  • the inner material layer 321 is composed of a single layer
  • the outer material layer 322 is composed of a plurality of layers made of the same material.
  • 321 may be formed in two or more layers.
  • more layers of the inner material layer 321 may be formed than layers of the outer material layer 322.
  • SYMBOLS 1 Column-beam connection structure, 10 ... Square steel pipe column, 20 ... Beam (H-shaped steel beam), 30 ... Thick wall square steel pipe (square steel pipe), 31 ... Steel plate, 32 ... Weld metal (welded part), 35 ... Back Gold, 321 ... Inner material layer, 322 ... Outer material layer

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Materials Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Arc Welding In General (AREA)

Abstract

La présente invention concerne un tuyau en acier carré présentant une section transversale rectangulaire et comprenant : une pluralité de feuilles d'acier plus épaisses qu'une épaisseur de plaque d'un tuyau en acier constituant une colonne de tuyau en acier rectangulaire ; et un métal soudé (32) lié par le soudage de bords latéraux des feuilles d'acier. Le métal soudé (32) est formé au niveau d'un coin du tuyau en acier carré et comprend une structure multicouche dans laquelle différents types de matériau sont empilés. Le point d'élasticité d'un matériau formant une couche de matériau interne (321) situé sur l'intérieur de multiples couches est supérieur au point d'élasticité d'un matériau formant une couche de matériau externe (322) située sur l'extérieur des multiples couches.
PCT/JP2019/042691 2018-10-31 2019-10-30 Tuyau en acier carré et procédé de soudage de tuyau en acier carré WO2020090939A1 (fr)

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KR1020217012479A KR102485533B1 (ko) 2018-10-31 2019-10-30 각형 강관 및 각형 강관의 용접 방법
JP2020554009A JP7252249B2 (ja) 2018-10-31 2019-10-30 角形鋼管及び角形鋼管の溶接方法

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JP2018205789 2018-10-31
JP2018-205789 2018-10-31

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