WO2024232120A1 - スタートエンドパーツ、溶接キットおよび溶接方法 - Google Patents

スタートエンドパーツ、溶接キットおよび溶接方法 Download PDF

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Publication number
WO2024232120A1
WO2024232120A1 PCT/JP2023/046481 JP2023046481W WO2024232120A1 WO 2024232120 A1 WO2024232120 A1 WO 2024232120A1 JP 2023046481 W JP2023046481 W JP 2023046481W WO 2024232120 A1 WO2024232120 A1 WO 2024232120A1
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WIPO (PCT)
Prior art keywords
tab
protrusion
boundary
along
welding
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/046481
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English (en)
French (fr)
Japanese (ja)
Inventor
啓輔 鳥形
康介 渡辺
直幸 松本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
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IHI Corp
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 IHI Corp filed Critical IHI Corp
Priority to JP2025519315A priority Critical patent/JPWO2024232120A1/ja
Publication of WO2024232120A1 publication Critical patent/WO2024232120A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by 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
    • B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
    • B23K37/06—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for positioning the molten material, e.g. confining it to a desired area

Definitions

  • the present disclosure aims to provide a start and end part, a welding kit, and a welding method that can avoid defects in the full circumference welding of hollow members.
  • the start end part includes a protrusion that is sandwiched between the end faces of the two members to be welded, and a tab that is connected to the protrusion and positioned on the outside of the end faces.
  • the tab may include a first tab end connected to the protrusion and a second tab end opposite the first tab end, and the tab may include a portion narrower than the width of the first tab end when viewed in a direction in which the end faces of the two components to be welded face each other.
  • the protrusion includes a first protrusion end that is connected to the tab and a second protrusion end opposite the first protrusion end, and when viewed in a direction in which the end faces of the two components to be welded face each other, the width of the second protrusion end may be different from the width of the first protrusion end.
  • Another aspect of the present disclosure includes a welding kit that includes a start end part that includes a protrusion that is sandwiched in a portion of the area between the end faces of the two members to be welded and a tab that is connected to the protrusion and positioned outside the end faces, and an insert that is sandwiched in another portion of the area between the end faces.
  • Still another aspect of the present disclosure includes a welding method, the welding method including preparing a start-end part including a protrusion sandwiched between end faces of two members to be welded and a tab connected to the protrusion and positioned outside the end faces, positioning the protrusion in a partial area between the end faces, starting melting from the tab, moving the melted portion from the tab to a boundary between the end faces, performing a full circumference weld along the boundary, returning the melted portion from the boundary to the tab, and terminating melting at the tab.
  • Transferring the molten portion from the tab to the boundary may include moving the molten portion along a first pass located in a plane parallel to the boundary and along a direction intersecting the boundary, and performing a circumferential weld along the boundary may include moving the molten portion along a second pass located in the plane and along the boundary.
  • the first path may be smoothly connected to the second path by a curve that does not contain any vertices.
  • Transferring the molten portion from the tab to the boundary may include pivoting the welder about an axis parallel to the direction in which the end faces of the two components being welded face each other.
  • Performing a full circumference weld along the boundary may include moving the molten portion along a second pass located in a plane parallel to the boundary and along the boundary, and returning the molten portion from the boundary back to the tab may include moving the molten portion along a third pass located in the plane and along a direction intersecting the boundary.
  • the third path may be smoothly connected to the second path by a curve that does not contain any vertices.
  • Removing the molten portion from the interface back onto the tab may involve pivoting the welder about an axis parallel to the direction in which the end faces of the two components being welded face each other.
  • the welding method may include providing an insert and placing the insert in another area between the end faces, and performing a circumferential weld along the boundary may include moving the molten portion along the insert.
  • This disclosure makes it possible to avoid defects in the full circumference welding of hollow components.
  • FIG. 1 is a schematic side view showing a start end part, a welding kit, and a welding method according to an embodiment.
  • FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG.
  • FIG. 3 is a schematic perspective view showing a start end part according to the embodiment.
  • FIG. 4 is a schematic cross-sectional view showing the first and second passes.
  • FIG. 5 is a schematic cross-sectional view showing the second and third passes.
  • FIG. 1 is a schematic side view showing a start end part 50, a welding kit 100, and a welding method according to an embodiment.
  • the welding method according to this embodiment is applied to full-circumference welding of a hollow member.
  • at least one of the two members to be welded may be a hollow member.
  • the end face to be welded of the hollow member includes a closed cross section surrounding an opening.
  • the end faces 11, 21 of two cylindrical tubes 10, 20 are welded.
  • the members to be welded are not limited to cylindrical tubes.
  • the welding method according to this embodiment may be applied to welding a polygonal tube.
  • the welding method according to this embodiment may be applied to welding a hollow container.
  • cylindrical tube 10 and cylindrical tube 20 are arranged concentrically with each other. Therefore, in the present disclosure, the axial direction, radial direction, and circumferential direction of cylindrical tubes 10, 20 may be simply referred to as the "axial direction,” the “radial direction,” and the “circumferential direction,” unless otherwise specified. Also, in the present disclosure, the direction in which end face 11 and end face 21 face each other is indicated as D1. In the present embodiment, direction D1 coincides with the axial direction.
  • the welding method according to this embodiment is applied to welding in which defects such as insufficient fusion or blowholes may be formed at the melting start position and melting end position.
  • defects such as insufficient fusion or blowholes may be formed at the melting start position and melting end position.
  • laser welding electron beam welding, or plasma welding may be used.
  • laser welding is used.
  • the welding kit 100 includes a start end part 50 and an insert 60.
  • FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1.
  • FIG. 2 shows a cross-section through the insert 60 as seen in direction D1.
  • the cylindrical tube 10 and the end face 11 are not shown in FIG. 2.
  • the start end part 50 includes a protrusion 51 and a tab 52.
  • the protrusion 51 is sandwiched in a portion of the region between the end face 11 and the end face 21. Specifically, the protrusion 51 is disposed in a portion of the region between the end face 11 and the end face 21 in the circumferential direction. The protrusion 51 extends radially inward from the outer edges of the end faces 11, 21. In this embodiment, the protrusion 51 extends from the outer edges to the inner edges of the end faces 11, 21.
  • the tab 52 is disposed outside the end faces 11, 21, i.e., radially outward of the cylindrical tubes 10, 20.
  • the tab 52 protrudes radially outward beyond the outer surfaces of the cylindrical tubes 10, 20.
  • FIG. 3 is a schematic perspective view showing a start end part 50 according to an embodiment.
  • the protrusion 51 and the tab 52 are connected to each other.
  • the protrusion 51 and the tab 52 may be formed integrally with each other.
  • the protrusion 51 and the tab 52 may be formed separately from each other and then connected to each other.
  • the protrusion 51 has a flat plate shape.
  • the tab 52 has a shape that is thicker than the protrusion 51 in the direction D1. With this configuration, the laser can be easily irradiated onto the tab 52, and a molten portion can be easily formed on the tab 52 (described in detail below).
  • the protrusion 51 includes a first protrusion end 51a that is connected to the tab 52 and a second protrusion end 51b opposite the first protrusion end 51a.
  • the tab 52 includes a first tab end 52a that is connected to the protrusion 51 and a second tab end 52b opposite the first tab end 52a.
  • the tab 52 also includes side surfaces 52c and 52d that connect the first tab end 52a and the second tab end 52b.
  • the width w2 of the second tab end 52b of the tab 52 is smaller than the width w1 of the first tab end 52a.
  • the tab 52 has a trapezoidal shape when viewed in the direction D1.
  • the tab 52 has a shape that is linearly symmetrical with respect to a central axis line connecting the center of the protrusion 51 and the center of the tab 52 when viewed in the direction D1. Therefore, in this embodiment, the tab 52 has an isosceles trapezoidal shape when viewed in the direction D1.
  • the first tab end 52a corresponds to the long base of the trapezoid
  • the second tab end 52b corresponds to the short base.
  • the side surfaces 52c and 52d correspond to the legs of the trapezoid.
  • the tab 52 may have other shapes, such as a triangular shape or a semicircular shape, when viewed in the direction D1.
  • the angle between the outer surface of the cylindrical tube 10, 20 and the side surface 52c, and the angle between the outer surface of the cylindrical tube 10, 20 and the side surface 52d are larger than when the tab 52 has a square or rectangular shape when viewed in the direction D1. Therefore, when moving the molten part from the side surface 52c to the boundary B between the end faces 11, 21, the molten part can be moved smoothly (described in detail later). Also, when moving the molten part from the boundary B back to the side surface 52d, the molten part can be moved smoothly (described in detail later).
  • the width w4 of the second protrusion end 51b of the protrusion 51 is different from the width w3 of the first protrusion end 51a.
  • the width w4 of the second protrusion end 51b is smaller than the width w3 of the first protrusion end 51a.
  • the protrusion 51 has a trapezoidal shape when viewed in the direction D1.
  • the protrusion 51 has a linear symmetric shape with respect to the central axis connecting the center of the protrusion 51 and the center of the tab 52 when viewed in the direction D1.
  • the protrusion 51 has an isosceles trapezoidal shape when viewed in the direction D1.
  • the first protrusion end 51a corresponds to the long base of the trapezoid
  • the second protrusion end 51b corresponds to the short base.
  • the tab 52 may have other shapes, such as a triangular shape or a semicircular shape, when viewed in the direction D1.
  • the width w4 of the second protrusion end 51b of the protrusion 51 may be greater than the width w3 of the first protrusion end 51a (e.g., a dovetail shape).
  • the first protrusion end 51a corresponds to the short base of the trapezoid
  • the second protrusion end 51b corresponds to the long base.
  • the width w3 of the first protruding end 51a of the protrusion 51 when viewed in direction D1, is the same as the width w1 of the first tab end 52a of the tab 52. In other embodiments, when viewed in direction D1, the width w3 of the first protruding end 51a of the protrusion 51 may be different from the width w1 of the first tab end 52a of the tab 52.
  • the insert 60 is sandwiched between the end face 11 and the end face 21 in the area other than the area where the protrusion 51 is arranged. In this embodiment, the insert 60 is sandwiched in the remaining area between the end face 11 and the end face 21 with respect to the area where the protrusion 51 is arranged. In this embodiment, the insert 60 has a C-shape. The protrusion 51 fits into a cut in the C-shape of the insert 60. The insert 60 has the same or approximately the same thickness as the protrusion 51 in the direction D1.
  • start end part 50 and the insert 60 may be formed of the same material.
  • the start end part 50 and the insert 60 may be formed of a material that exhibits mechanical properties equivalent to those of the base material after welding.
  • FIG. 4 is a schematic cross-sectional view showing the first pass P1 and the second pass P2.
  • FIG. 4 shows the situation where melting starts from the start end part 50 and the melted portion moves from the start end part 50 to the boundary B between the end faces 11 and 21. Note that hatching on the cross section is omitted in FIG. 4 for better understanding. Also, the cylindrical tube 10 and the end face 11 are not shown in FIG. 4.
  • Each of the first pass P1 and the second pass P2 shows the trajectory of the deepest part of the melted portion.
  • Arrow M1 shows the movement of the laser head 70 for generating the first pass P1
  • arrow M2 shows the movement of the laser head 70 for generating the second pass P2.
  • the insert 60 is placed on one of the end face 11 of the cylindrical tube 10 and the end face 21 of the cylindrical tube 20.
  • the protrusion 51 of the start end part 50 is fitted into the slit of the insert 60.
  • the other of the end face 11 of the cylindrical tube 10 and the end face 21 of the cylindrical tube 20 is placed on top of the insert 60 and the protrusion 51.
  • the protrusion 51 may be placed before the insert 60.
  • the laser head 70 of the laser welding machine is aimed at the side 52c of the tab 52, and melting begins from the side 52c.
  • the deepest part of the melting initiation point is formed on the opposite side 52d.
  • the laser head 70 is rotated (e.g., pivoted) as shown by the arrow M1, thereby moving the molten part along the first path P1.
  • the side surface 52c of the tab 52 is continuous with the outer surface of the cylindrical tube 10, 20.
  • the "pivot operation” means rotating the tip of the welding machine around a predetermined axis line in the welding machine. Therefore, the molten part (laser irradiation part) is continuously moved from the side surface 52c to the outer edge of the boundary B.
  • the first path P1 extends along a direction intersecting the boundary B.
  • the first path P1 extends from the melting start point toward the inside of the cylindrical tube 10, 20.
  • the first path P1 crosses the first tab end 52a and the first protruding end 51a along a generally radial direction. For example, the first path P1 extends in a straight line from the melting start point.
  • the laser head 70 continues to pivot, transferring the molten portion from the first pass P1 to the second pass P2.
  • the second pass P2 is along the boundary B.
  • the second pass P2 is located on the inner edge of the boundary B. That is, in this embodiment, the second pass P2 is along the inner edges of the end faces 11, 21.
  • the insert 60 is positioned at the boundary B.
  • the second pass P2 is located on the inner edge of the insert 60.
  • the first pass P1 and the second pass P2 are located in the same plane parallel to the boundary B.
  • the first path P1 is smoothly connected to the second path P2. Specifically, the first path P1 and the second path P2 are connected by a curve that does not include a vertex. Also, as described above, in this embodiment, the angle between the side surface 52c of the tab 52 and the outer surface of the cylindrical tubes 10, 20 is relatively large. Therefore, when the molten portion is transferred from the first path P1 to the second path P2, the change in penetration depth can be reduced. As a result, the molten portion can be moved smoothly.
  • the laser head 70 continues to pivot until it is oriented perpendicular to the outer surfaces of the cylindrical tubes 10, 20. Once the laser head 70 is oriented perpendicular to the outer surfaces of the cylindrical tubes 10, 20, the laser head 70 is moved along the outer edge of boundary B while maintaining the laser head 70 perpendicular to the outer surfaces of the cylindrical tubes 10, 20, as shown by arrow M2, and the molten portion is moved along the second pass P2. This results in a full circumference weld along boundary B.
  • FIG. 5 is a schematic cross-sectional view showing the second pass P2 and the third pass P3.
  • FIG. 5 shows the situation where the molten part is returned from the boundary B to the start-end part 50, and the melting is terminated at the start-end part 50. Note that hatching of the cross section is omitted in FIG. 5 for better understanding. Also, the cylindrical tube 10 and the end face 11 are not shown in FIG. 5. Similar to the first pass P1 and the second pass P2, the third pass P3 shows the trajectory of the deepest part of the molten part. Arrow M3 shows the movement of the laser head 70 to generate the third pass P3.
  • the laser head 70 is pivoted as shown by the arrow M3 while adjusting the focus of the laser. This transitions the molten portion from the second pass P2 to the third pass P3.
  • the side surface 52d of the tab 52 is continuous with the outer surface of the cylindrical tube 10, 20. Therefore, the molten portion (laser irradiated portion) is continuously moved from the outer edge of the boundary B to the side surface 52d.
  • the third pass P3 extends along a direction intersecting the boundary B. The third pass P3 extends from the boundary B toward the outside of the cylindrical tube 10, 20.
  • the third pass P3 crosses the first tab end 52a and the first protrusion end 51a generally along the radial direction.
  • the third pass P3 extends in a straight line from the boundary B to the side surface 52c of the tab 52.
  • the second path P2 and the third path P3 are located in the same plane parallel to the boundary B. That is, the first path P1, the second path P2, and the third path P3 are located in the same plane.
  • the third pass P3 is smoothly connected to the second pass P2. Specifically, the third pass P3 and the second pass P2 are connected by a curve that does not include a vertex. Also, as described above, in this embodiment, the angle between the side surface 52d of the tab 52 and the outer surface of the cylindrical tubes 10, 20 is relatively large. Therefore, when the molten portion is transferred from the second pass P2 to the third pass P3, the change in penetration depth can be reduced. As a result, the molten portion can be moved smoothly.
  • the tab 52 is removed from the side surface of the cylindrical tubes 10, 20. This completes the welding operation.
  • the tab 52 may be removed by a laser from the laser head 70. In other embodiments, the tab 52 may be removed by other methods such as machining.
  • the start end part 50 includes a protrusion 51 sandwiched between the end faces 11, 21 of the two cylindrical tubes 10, 20 to be welded, and a tab 52 connected to the protrusion 51 and disposed outside the end faces 11, 21.
  • the welding start position and welding end position can be positioned on the tab 52. Therefore, it is possible to suppress the generation of defects such as poor fusion and blowholes at the boundary B. As a result, defects can be avoided in the full circumference welding of the cylindrical tubes 10, 20.
  • the tab 52 can be easily disposed outside the cylindrical tubes 10, 20 by simply sandwiching the protrusion 51 between the end faces 11, 21. Therefore, the burden on the worker can be reduced.
  • the tab 52 includes a first tab end 52a connected to the projection 51 and a second tab end 52b opposite to the first tab end 52a.
  • the tab 52 When viewed in the direction D1 in which the end faces 11, 21 of the cylindrical tubes 10, 20 to be welded face each other, the tab 52 includes the second tab end 52b having a width w2 narrower than the width w1 of the first tab end 52a.
  • the angle between the outer surface of the cylindrical tubes 10, 20 and the side surface 52c of the tab 52 and the angle between the outer surface of the cylindrical tubes 10, 20 and the side surface 52d of the tab 52 is larger than when the tab 52 has a square or rectangular shape, for example, when viewed in the direction D1. Therefore, when the molten portion moves between the tab 52 and the boundary B, the molten portion can move smoothly.
  • the protrusion 51 also includes a first protrusion end 51a connected to the tab 52 and a second protrusion end 51b opposite the first protrusion end 51a, and when viewed in the direction D1 in which the end faces 11, 21 of the cylindrical tubes 10, 20 to be welded face each other, the width w4 of the second protrusion end 51b is different from the width w3 of the first protrusion end 51a.
  • the protrusion 51 can be pressed radially against the insert 60 like a wedge. Therefore, the protrusion 51 can be tightly attached to the insert 60.
  • the welding kit 100 also includes a start-end part 50 including a protrusion 51 that is sandwiched in a portion of the area between the end faces 11, 21 of the cylindrical pipes 10, 20 to be welded, and a tab 52 that is connected to the protrusion 51 and positioned outside the end faces 11, 21, and an insert 60 that is sandwiched in another area between the end faces 11, 21.
  • a sufficient amount of material can be supplied to the boundary B to form the excess fill and the back wave.
  • the tab 52 can be easily positioned by fitting the protrusion 51 into the slit in the insert 60. This reduces the burden on the worker.
  • the welding method includes preparing a start-end part 50 including a protrusion 51 sandwiched between the end faces 11, 21 of the cylindrical pipes 10, 20 to be welded, and a tab 52 connected to the protrusion 51 and disposed outside the end faces 11, 21, disposing the protrusion 51 in a partial area between the end faces 11, 21, starting melting from the tab 52, moving the melted portion from the tab 52 to the boundary B between the end faces 11, 21, performing full-circumference welding along the boundary B, returning the melted portion from the boundary B to the tab 52, and ending melting at the tab 52.
  • the welding start position and welding end position can be positioned on the tab 52. Therefore, it is possible to suppress the generation of defects at the boundary B.
  • the tab 52 can be easily disposed outside the cylindrical pipes 10, 20 by simply sandwiching the protrusion 51 between the end faces 11, 21. This reduces the burden on workers.
  • moving the molten portion from the tab 52 to the boundary B includes moving the molten portion along a first pass P1 located in a plane parallel to the boundary B and along a direction intersecting the boundary B, and performing full-circumference welding along the boundary B includes moving the molten portion along a second pass P2 located in the above-mentioned plane and along the boundary B.
  • the first pass P1 and the second pass P2 are formed in the same plane. Therefore, when moving the molten portion from the tab 52 to the boundary B, the molten portion can be moved by a simple change of direction in the same plane.
  • the first path P1 is smoothly connected to the second path P2 by a curve that does not include a vertex.
  • moving the molten portion from the tab 52 to the boundary B includes pivoting the laser head 70 about an axis parallel to the direction D1. With this configuration, the molten portion can be easily moved by a simple pivoting motion of the welding machine.
  • performing full circumference welding along boundary B includes moving the molten portion along a second pass P2 located in a plane parallel to boundary B and along boundary B, and moving the molten portion from boundary B to tab 52 includes moving the molten portion along a third pass P3 located in the above-mentioned plane and along a direction intersecting boundary B.
  • the second pass P2 and the third pass P3 are formed in the same plane. Therefore, when moving the molten portion from boundary B back to tab 52, it is possible to move the molten portion with a simple change of direction in the same plane.
  • the third pass P3 is smoothly connected to the second pass P2 by a curve that does not include a vertex.
  • moving the molten portion back from the boundary B to the tab 52 includes pivoting the laser head 70 about an axis parallel to the direction D1. With this configuration, the molten portion can be easily moved by a simple pivoting motion of the welding machine.
  • the welding method according to this embodiment also includes preparing an insert 60 and placing the insert 60 in another region between the end faces 11 and 21, and performing full-circumference welding along the boundary B includes moving the molten portion along the insert 60. With this configuration, a sufficient amount of material can be supplied to the boundary B to form the excess fillet and the back wave.
  • start end part 50 and the insert 60 are formed separately from one another.
  • the start end part 50 and the insert 60 may be formed integrally with one another.
  • an insert 60 is used.
  • the insert 60 may not be used.
  • a groove may be formed in at least one of the end face 11 of the cylindrical tube 10 and the end face 21 of the cylindrical tube 20, and the protrusion 51 of the start end part 50 may be fitted into this groove.
  • the remaining portions of the end face 11 and the end face 21 are in direct contact with each other.
  • a one-piece insert 60 is used.
  • the insert 60 may include multiple pieces divided in the circumferential direction.
  • the tab 52 when viewed in the direction D1, the tab 52 includes the second tab end 52b as a portion narrower than the width w1 of the first tab end 52a. In other embodiments, the tab 52 may include such a portion at another position. For example, when viewed in the direction D1, the tab 52 may include a portion between the first tab end 52a and the second tab end 52b that is narrower than both the width w1 and the width w2. In other words, the tab 52 may include its narrowest portion between the first tab end 52a and the second tab end 52b. In this case, the width w2 of the second tab end 52b may be greater than the width w1 of the first tab end 52a.
  • This disclosure can avoid defects in circumferential welding, which can contribute, for example, to Goal 12 of the Sustainable Development Goals (SDGs), "Responsible Consumption and Production.”
  • SDGs Sustainable Development Goals

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Laser Beam Processing (AREA)
PCT/JP2023/046481 2023-05-10 2023-12-25 スタートエンドパーツ、溶接キットおよび溶接方法 Ceased WO2024232120A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5025459A (https=) * 1973-07-10 1975-03-18
JPS61172696A (ja) * 1985-01-29 1986-08-04 Daiei Can Koji:Kk パイプ溶接用インサ−トリング
JPH0293098U (https=) * 1988-12-28 1990-07-24
JP2023042960A (ja) * 2021-09-15 2023-03-28 株式会社熊谷組 溶接対象部端面形成部材、及び、溶接対象部端面形成部材を用いた柱の接合方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5025459A (https=) * 1973-07-10 1975-03-18
JPS61172696A (ja) * 1985-01-29 1986-08-04 Daiei Can Koji:Kk パイプ溶接用インサ−トリング
JPH0293098U (https=) * 1988-12-28 1990-07-24
JP2023042960A (ja) * 2021-09-15 2023-03-28 株式会社熊谷組 溶接対象部端面形成部材、及び、溶接対象部端面形成部材を用いた柱の接合方法

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