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WO2018037754A1 - Procédé de soudage à l'arc sous protection gazeuse à rainure verticale étroite - Google Patents

Procédé de soudage à l'arc sous protection gazeuse à rainure verticale étroite Download PDF

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Publication number
WO2018037754A1
WO2018037754A1 PCT/JP2017/025615 JP2017025615W WO2018037754A1 WO 2018037754 A1 WO2018037754 A1 WO 2018037754A1 JP 2017025615 W JP2017025615 W JP 2017025615W WO 2018037754 A1 WO2018037754 A1 WO 2018037754A1
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Prior art keywords
welding
groove
weaving
less
thick steel
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PCT/JP2017/025615
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English (en)
Japanese (ja)
Inventor
渉平 上月
早川　直哉
大井　健次
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Ｊｆｅスチール株式会社
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Priority to CN201780045727.3A priority Critical patent/CN109641306B/zh
Priority to KR1020197006883A priority patent/KR102126667B1/ko
Priority to JP2017554533A priority patent/JP6439882B2/ja
Publication of WO2018037754A1 publication Critical patent/WO2018037754A1/fr

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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
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • 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
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/022—Welding by making use of electrode vibrations
    • 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
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys

Definitions

  • the present invention relates to a narrow gap gas shield arc welding method, and more particularly to a vertical narrow gap gas shield arc welding method that can be applied to butt welding of two thick steel materials.
  • “narrow groove” means that the groove angle is 20 ° or less and the groove gap is 20 mm or less.
  • the gas shielded arc welding used for the welding of steel is generally a consumable electrode type in which a gas of CO 2 alone or a mixed gas of Ar and CO 2 is used as a shield for a molten portion.
  • Such gas shielded arc welding is widely used in the field of manufacturing automobiles, architecture, bridges, electrical equipment and the like.
  • narrow gap gas shielded arc welding in which a gap having a small gap with respect to the plate thickness is multilayer-welded by arc welding. Since this narrow gap gas shielded arc welding has a smaller amount of welding than normal gas shielded arc welding, it is expected that the efficiency and energy saving of welding can be achieved, and that the construction cost can be reduced.
  • electroslag welding is usually applied to vertical high-efficiency welding, but 1-pass large heat input welding is fundamental, and welding with a plate thickness exceeding 60 mm causes excessive heat input and may cause a decrease in toughness. Has been.
  • there is a limit to the plate thickness in one-pass welding and in particular, the technology has not yet been established for welding with a plate thickness exceeding 65 mm.
  • Patent Document 1 discloses a double-sided multi-layer welding method for a double-sided U-shaped groove joint.
  • lamination welding is performed by TIG welding using an inert gas, and the use of inert gas suppresses the generation of slag and spatter and prevents the lamination defects.
  • TIG welding which is a non-consumable electrode type, is greatly inferior in efficiency of the welding method itself as compared to MAG welding or CO 2 welding using a steel wire as a consumable electrode.
  • Patent Document 2 discloses a vertical welding method with a narrow groove in which weaving of a welding torch is performed in order to suppress spatter and poor fusion.
  • this welding method since the weaving direction of the welding torch is not the groove depth direction but the steel plate surface direction, it is necessary to weave the welding torch before the molten metal droops. It is necessary to reduce the welding amount per pass ( ⁇ heat input) with a low current of about 150A. For this reason, when this welding method is applied to the welding of a thick steel material having a large plate thickness, the welding becomes a small amount of multi-pass laminating, resulting in a large number of laminating defects such as poor penetration and a large reduction in welding efficiency.
  • Patent Document 3 discloses a vertical welding method in which weaving of a welding torch is performed in order to suppress poor fusion.
  • the surface angle (groove angle) disclosed here is as wide as 26.3 to 52 °, the weaving of the welding torch here is also performed in the groove depth direction.
  • the vertical welding method of patent document 3 it is possible to take a relatively large amount of welding per pass.
  • the amount of weaving in the groove depth direction is small and the composition of the weld metal and welding wire is not considered, it is necessary to suppress the amount of welding per pass ( ⁇ heat input), and the welding depth per pass The depth is as shallow as 10mm.
  • Patent Document 4 discloses a two-electrode electrogas arc welding apparatus that enables one-pass welding of an extremely thick material.
  • this two-electrode electrogas arc welding apparatus it is possible to join thick steel materials up to about 70 mm thick.
  • the heat input is greatly increased to about 360 kJ / cm by using two electrodes, the heat effect on the steel sheet is large, and when high properties (strength and toughness) are required for the joint, such properties are satisfied. It becomes very difficult.
  • this two-electrode electrogas arc welding apparatus it is indispensable to provide a ceramic backing on the back surface and a water-cooled copper metal pressing mechanism on the front surface (welder side) in the groove.
  • JP 2009-61483 A JP 2010-115700 A JP 2001-205436 A Japanese Patent Laid-Open No. 10-118771 Japanese Patent No. 5884209
  • the present invention utilizes high-performance and high-precision welding automation technology to perform high-quality and high-efficiency welding of thick steel materials by weaving a precise welding torch according to the groove shape, welding posture, etc.
  • An object of the present invention is to provide a vertical narrow gap gas shielded arc welding method capable of achieving the above.
  • Welding of the welding torch is performed with the maximum weaving width in the plate thickness direction and the direction perpendicular to the welding line set to (W-6) mm to Wmm, where W is the weld bead width in the first layer welding.
  • W is the weld bead width in the first layer welding.
  • Patent Document 5 has made it possible to provide a high-quality and high-efficiency vertical narrow-gas-shield arc welding method that can be applied to welding of thick steel materials.
  • a welding wire added with REM in the range of 0.015 to 0.100 mass% is used.
  • Welding conditions in the first layer welding are controlled in more detail, that is, weaving is performed by a welding torch having a bent portion and a tip portion defined by the bent portion. At the time of weaving, the tip of the welding torch is rocked under appropriate conditions toward the groove surface of the thick steel material. Therefore, even when the groove angle is further reduced, it is possible to prevent the arc from creeping up to the groove wall surface and to sufficiently melt the groove surface, resulting in generation of welding defects.
  • the gist configuration of the present invention is as follows.
  • the angle ⁇ 1 with respect to the horizontal direction of the tip is 10 ° or more and 45 ° or less, and the swing angle ⁇ 2 of the tip of the welding torch from the reference position is 5 ° or more and 60 ° or less,
  • the joining depth in the first layer welding is 10 mm or more, Vertical narrow gap gas shielded arc welding method.
  • the present invention even when a thick steel material having a plate thickness of 10 mm or more is welded under a groove condition with a small groove angle, the stability of the bead shape including suppression of dripping of molten metal, which is a problem in vertical welding, is achieved. It is possible to obtain a high-toughness welded joint by performing high-quality and high-efficiency narrow groove gas shielded arc welding while reducing the size and preventing the occurrence of welding defects.
  • the welding method of the present invention has a smaller amount of welding than ordinary gas shielded arc welding, and can achieve energy saving by increasing the efficiency of welding, so that the welding construction cost can be greatly reduced.
  • a water-cooling type copper metal pressing mechanism for preventing dripping of molten metal as in the electrogas arc welding apparatus shown in Patent Document 4 is unnecessary, so that the apparatus is not complicated. Furthermore, since welding heat input per pass can be suppressed by multipass welding with a predetermined groove shape, the desired mechanical characteristics of the weld metal and steel material heat affected zone can be obtained. Ensuring is easy.
  • Examples of various groove shapes are shown.
  • the construction procedure when constructing the first layer welding by the welding method according to one embodiment of the present invention is shown.
  • a V-shaped groove shape an example of a groove section after first layer welding is shown. It shows the weaving pattern of the welding torch as seen from the weld line direction in the weaving of the first layer welding.
  • 1A to 1C show examples of various groove shapes.
  • reference numeral 1 is a thick steel material
  • 2 is a groove surface of the thick steel material
  • 3 is a groove in the lower part of the steel material (in the Y-shaped groove)
  • a groove angle is denoted by symbol ⁇
  • a groove gap is denoted by G.
  • T indicates the plate thickness
  • h indicates the groove height of the lower part of the steel material (in the Y-shaped groove).
  • the target groove shape here can be either a V-shaped groove (including an I-shaped groove and a L-shaped groove) or a Y-shaped groove.
  • a multi-stage Y-shaped groove may be used.
  • the groove angle and the groove gap in the case of the Y-shaped groove are the groove angle and the groove gap in the groove of the steel lower step part.
  • the groove in the lower part of the steel material means 20 to 40% of the plate thickness from the steel material surface that becomes the back surface (the surface on the welding device (welding torch) side is the front surface and the opposite surface is the back surface) during welding. Means an area to the extent.
  • FIG. 2 shows the construction point at the time of constructing the first layer welding by the welding method according to the embodiment of the present invention in the V-shaped groove shape.
  • reference numeral 4 is a welding torch
  • 5 is a welding wire
  • 6 is a backing material.
  • a weld line, a molten pool, and a weld bead illustration is abbreviate
  • the present welding method is a gas shielded arc welding in which two thick steel materials having a predetermined plate thickness are butted and these thick steel materials are joined by vertical welding using weaving. Basically, upward welding with the traveling direction upward. Then, during the weaving with respect to the groove surface of the thick steel material, the tip of the welding torch is swung toward the groove surface of the thick steel material.
  • the V-shaped groove shape is shown as an example, but the same applies to other groove shapes.
  • FIG. 3 is a schematic diagram showing a swinging state of the welding torch during weaving with respect to the groove surface of the thick steel material
  • FIGS. 3 (a) and 3 (b) are respectively in the plate thickness direction (thick steel material of FIG. 2).
  • FIG. 3 (c) shows a state where the welding torch is at the reference position and a state where the welding torch is swung at an angle of ⁇ 2, as viewed from the back surface (the side with the backing material) of FIG.
  • the reference position is a position where the tip of the welding torch (center line, that is, the protruding direction of the welding wire) is aligned with the welding line direction when viewed from the thickness direction.
  • reference numeral 7 is a main body portion
  • 8 is a power feed tip
  • 9 is a bent portion
  • 10 is a tip portion.
  • the distal end portion 10 is a portion that is closer to the welding wire (not shown) than the bending portion 9.
  • the bending part 9 may be provided in any of the main-body part 7 and the electric power feeding chip 8 which comprise a welding torch, it is preferable to provide in the electric power feeding chip 8 from the surface of workability.
  • ⁇ 1 is an angle with respect to the horizontal direction of the tip of the welding torch at the reference position
  • ⁇ 2 is a swinging angle of the tip of the welding torch from the reference position
  • ⁇ 3 is a bending angle at a bending portion of the welding torch
  • l is a welding torch. This is the length of the tip, which is based on the center line of each part of the welding torch.
  • FIG. 4 shows an example of a groove cross section after first layer welding in a V-shaped groove shape.
  • reference numeral 11 denotes a weld bead
  • symbol D denotes a joining depth in the first layer welding
  • W denotes a weld bead width (gap between the grooves after the first layer welding) in the first layer welding.
  • the joining depth D in the first layer welding is the minimum value of the weld bead height in the first layer welding when starting from the steel surface that is the back surface during welding (closest (low) first layer welding from the starting steel surface). Bead height).
  • a V-shaped groove shape is shown as an example, but D and W are the same in other groove shapes.
  • Groove angle ⁇ 20 ° or less
  • the faster and more efficient welding is possible, but defects such as poor fusion are likely to occur.
  • welding in the case where the groove angle exceeds 20 ° can be performed by a conventional construction method.
  • this welding method is intended for the case where the groove angle is 20 ° or less, which is difficult to construct by the conventional construction method and is expected to further improve the efficiency.
  • the groove angle is 0 °
  • I-shaped groove when the groove angle is 0 °, it is called a so-called I-shaped groove, and this 0 ° is the most efficient in terms of the amount of welding, and the groove angle is 0 °.
  • the thickness t (however, in the case of Y-shaped groove, the lower part of the steel material) It is preferable to set a groove angle according to the groove height h).
  • the groove angle is preferably in the range of (0.5 ⁇ t / 20) to (2.0 ⁇ t / 20) °, more preferably (0.8 ⁇ t / 20) to (1.2 ⁇ t / 20). ) ° range.
  • the groove angle is preferably in the range of 2.5 to 10 °, more preferably in the range of 4 to 6 °.
  • the upper limit of the preferred range exceeds 10 °. In this case, the upper limit of the preferred range is 10 °.
  • Groove gap G 20 mm or less
  • the groove gap is 20 mm or less.
  • the groove gap is more preferably 25% or less of the thickness of the steel material to be welded. More preferably, it is 20% or less.
  • the steel plate thickness should be 10 mm or more. This is because if the steel sheet thickness is less than 10 mm, a conventional joint, for example, a semi-automatic CO 2 arc welding using a semi-flux cored wire, a healthy joint while suppressing the heat input of welding. This is because there are cases in which Preferably it is 15 mm or more, more preferably 20 mm or more. When a general rolled steel material is targeted, the upper limit of the plate thickness is generally 100 mm. Therefore, it is preferable that the upper limit of the thickness of the steel material used here is 100 mm or less.
  • high strength steel for example, ultra-thick YP460MPa class steel for shipbuilding (tensile strength of 570MPa class steel) and TMCP steel for construction SA440 (tensile strength of 590MPa class steel)
  • ultra-thick YP460MPa class steel for shipbuilding tensile strength of 570MPa class steel
  • TMCP steel for construction SA440 tensile strength of 590MPa class steel
  • this welding method welding can be efficiently performed at a heat input of 170 kJ / cm or less, and 590 MPa class high-strength steel sheet and 590 MPa class corrosion-resistant steel, which is a high alloy system, can be welded.
  • mild steel can be handled without problems.
  • REM 0.015-0.100 mass% REM is an effective element for refinement of inclusions during steelmaking and casting and for improving the toughness of weld metal.
  • REM in particular when the welding wire is positive (wire minus) or when the welding current is increased, makes the droplets finer, stabilizes the droplet transfer, and further reduces the arc on the groove surface. It has the effect that generation
  • the droplets finer and stabilizing the droplet transfer it is possible to suppress spattering and perform stable gas shield arc welding.
  • the REM content is less than 0.015% by mass, the effect of making the droplets finer and stabilizing the droplet transfer cannot be obtained.
  • the REM content of the welding wire is in the range of 0.015 to 0.100% by mass. Preferably, it is in the range of 0.025 to 0.050 mass%.
  • the components other than the above-described REM are not particularly limited, and may be appropriately selected according to the steel type of the steel material to be welded.
  • C 0.10 to 0.20 mass%
  • Si 0.05 to 2.5 mass%
  • Mn 0.25 to 3.5 mass%
  • P 0.05 mass%
  • the composition may be S: 0.02% by mass or less
  • Al 0.005 to 3.00% by mass
  • O 0.008% by mass or less
  • N 0.008% by mass or less
  • the polarity of the welding wire to be used is preferably a wire minus (positive polarity) from the viewpoint of sufficiently obtaining the effects of the refinement of droplets and the stabilization of droplet transfer by the addition of REM.
  • the angle ⁇ 1 10 ° to 45 ° with respect to the horizontal direction of the tip of the welding torch at the reference position
  • a welding torch using a welding torch having a bent portion and a tip defined by the bent portion is used.
  • tip part of the welding torch in a reference position shall be 10 degrees or more and 45 degrees or less. Preferably, it is 15 ° or more and 30 ° or less.
  • a welding torch using a welding torch having a bent portion and a tip defined by the bent portion is used.
  • the tip of the wire By weaving while swinging the tip of the wire toward the groove surface of the thick steel material, it is possible to bring the tip of the wire closer to the groove surface while avoiding contact between the power feed tip and the groove surface of the thick steel material become. Further, since the wire tip also faces the groove surface, the groove surface can be directly melted by an arc. For this reason, even if it is a case where the amount of welding heat inputs per pass is suppressed, generation
  • the spread of the arc heat input range due to the weaving of the welding torch can suppress the dripping of the molten metal and can stabilize the bead shape.
  • ⁇ 2 is less than 5 °, the above effects cannot be obtained sufficiently, and welding defects and dripping of molten metal occur.
  • [theta] 2 exceeds 60 [deg.]
  • the groove surface is excessively melted, resulting in a welding defect due to an undercut of the groove surface.
  • the rocking angle ⁇ 2 of the tip of the welding torch from the reference position is set to 5 ° to 60 °.
  • it is 10 ° or more and 45 ° or less.
  • the bending angle ⁇ 3 at the bending portion of the welding torch and the length l of the tip portion of the welding torch are not particularly limited, but from the viewpoint of controlling ⁇ 1 and ⁇ 2 within the above range, ⁇ 3 is set to 10 to It is preferable that the range is 45 ° and l is in the range of 10 to 50 mm.
  • the joining depth in the first layer welding should be It should be 10mm or more.
  • the joining depth in the first layer welding is 10 mm or more.
  • the upper limit of the joining depth in the first layer welding is the same as the upper limit of the thickness of the steel material, that is, about 100 mm.
  • the joining depth in the first layer welding is preferably 10 mm or more and 70 mm or less. More preferably, they are 20 mm or more and 60 mm or less, More preferably, they are 25 mm or more and 55 mm or less. In the case of single layer welding, it is more preferably 15 mm or more and 65 mm or less.
  • Weaving depth L in the sheet thickness direction in the weaving of the welding torch 10 mm to 70 mm
  • This welding method performs the weaving of the welding torch. It is also important to properly control the maximum weaving width M in the plate thickness direction and the direction perpendicular to the weld line, which will be described later.
  • the weaving depth L in the plate thickness direction and the maximum weaving width M in the plate thickness direction and the direction perpendicular to the weld line in various weaving patterns are as shown in FIGS. 5 (a) to 5 (d).
  • the weaving depth L and the maximum weaving width M in a direction perpendicular to the plate thickness direction and the welding line, which will be described later, do not take into account the oscillation of the tip of the welding torch, and the tip of the welding torch
  • the weaving depth and the maximum weaving width at the tip of the welding wire determined on the assumption that the welding wire is at the reference position. Further, the weaving pattern here is a locus of the welding wire tip when it is assumed that the tip of the welding torch is always at the reference position without considering the swing of the tip of the welding torch.
  • the weaving depth and the weaving width in the plate thickness direction are approximately the same in the vertical upward welding that is the basis of this welding method, if the weaving depth in the plate thickness direction is less than 10 mm, it is desired. It becomes difficult to obtain the junction depth. On the other hand, if the weaving depth in the plate thickness direction exceeds 70 mm, not only will it be difficult to obtain the desired joint depth, but also the heat input will be excessive, which will affect the heat affected zone of the weld metal or steel material. In addition, it is difficult to obtain desired mechanical characteristics, and welding defects such as hot cracking, poor fusion of the groove surfaces due to dispersion of heat during welding, and slag entrainment are likely to occur.
  • the weaving depth in the thickness direction is 10 mm or more and 70 mm or less. Preferably they are 15 mm or more and 65 mm or less.
  • the thickness is preferably 20 mm or more and 60 mm or less.
  • the thickness is preferably in the range of 25 mm to 55 mm.
  • W weld bead width in first layer welding
  • the maximum weaving width in the plate thickness direction and the direction perpendicular to the weld line must be (W ⁇ 6) mm or more.
  • the maximum weaving width in the plate thickness direction and the direction perpendicular to the weld line exceeds Wmm, the molten metal may sag and welding may not be realized. Accordingly, the maximum weaving width in the plate thickness direction and the direction perpendicular to the weld line is preferably in the range of (W ⁇ 6) mm to W mm.
  • the range is not less than (W-4) mm and not more than (W-1) mm.
  • W is a groove width on the steel material surface that becomes the surface (surface on the welding device (welding torch) side) during welding.
  • the weaving pattern of the welding torch is not particularly limited, and as shown in FIGS. 5 (a) to (d), a U-shape when viewed from the welding line direction (which coincides with the welding progress direction and is usually the vertical direction), It can be V-shaped, trapezoidal, triangular, etc.
  • the weaving at points A ⁇ B and C ⁇ D as shown in FIGS. 5A and 5B corresponds to the weaving with respect to the groove surface of the thick steel material. It will be a thing.
  • the tip of the welding torch in the weaving from point A to point B, the tip of the welding torch is swung toward the groove surface of the left thick steel material toward the paper surface, while in the weaving from point C to point D, the welding torch Is swung toward the groove surface of the thick steel material on the right side toward the paper surface.
  • the tip of the welding torch need not be swung. 5A to 5D, the trajectory of the welding torch at each point where the direction of the welding torch changes (point B and point C in FIG. 5A) may be squared. You may make it round.
  • a U-shaped or V-shaped weaving pattern without a torch operation on the welding surface side.
  • the welding torch operation is deviated from the groove surface (for example, from point A to point B in FIG. 5C).
  • the locus of the tip of the welding torch is no longer parallel to the groove surface (side close to the welding torch) and the groove surface cannot be uniformly melted, and welding defects such as poor fusion are likely to occur. Therefore, in such a case, it is optimal to use a U-shaped weaving pattern in which it is easy to operate the welding torch parallel to the groove surface.
  • the steel material at the deepest point of the welding wire tip during weaving in the plate thickness direction (for example, points B and C in FIGS. 5 (a) and 5 (b), point B in FIGS. 5 (c) and 5 (d)).
  • the distance a from the back surface is usually about 2 to 5 mm.
  • M 1 , M 2 and M 3 in FIGS. 5A and 5B are 2 to 18 mm and 0 to 10 mm, respectively. 0 to 10mm.
  • the frequency and stop time during weaving are not particularly limited.
  • the frequency is 0.25 to 0.5 Hz (preferably 0.4 to 0.5 Hz).
  • the time may be about 0 to 0.5 seconds (preferably 0.2 to 0.3 seconds).
  • the average welding current is less than 270A, the weld pool is small, and on the surface side, it becomes a state of multi-layer welding that repeats melting and solidification for each torch weaving, resulting in poor fusion, slag Entrainment is likely to occur.
  • the average welding current exceeds 360 A, the molten (welded) metal tends to sag, and it becomes difficult to check the arc point by welding fume and spatter, making adjustment during construction difficult.
  • the average welding current is preferably 270 to 360A.
  • the shielding gas composition is not particularly limited, and a gas composed of CO 2 alone or a mixed gas of Ar and CO 2 may be used.
  • the number of stacks until the completion of welding is preferably about 2 to 4 layers from the viewpoint of preventing stacking faults.
  • the welding conditions in each layer other than the first layer are not particularly limited, and may follow a regular method.
  • the welding conditions may be the same as those described above for the first layer. Note that the welding method of the present invention is based on welding of one pass per layer.
  • a welding torch ( ⁇ 3: 15 °, l: 20mm) having a bent portion in the power feed tip as shown in FIG. 3 is used on the two steel materials having the groove shape shown in Table 1 under the welding conditions shown in Table 2. Then, the gas grooved arc welding was conducted with the narrow groove standing upward.
  • all the steel materials are C: 0.04 to 0.06 mass%, Si: 0.1 to 0.2 mass%, Mn: 1.8 to 2.0 mass%, P: 0.01 mass% or less, S: 0.005 mass% or less, Al: 0.02 to A component composition containing 0.06% by mass, O: 0.003% by mass or less and N: 0.005% by mass or less, with the balance being Fe and inevitable impurities was used.
  • the welding wire a 1.2 mm ⁇ solid wire of a grade for steel strength or one rank higher than that was used.
  • the composition of the components of the welding wire other than REM shown in Table 2 is as follows: C: 0.10 to 0.20 mass%, Si: 0.6 to 0.8 mass%, Mn: 1.8 to 2.0 mass%, P: 0.01 mass% or less, S: 0.005 mass% or less, Al: 0.005 to 0.03 mass%, O: 0.003 mass% or less, and N: 0.005 mass% or less, with the balance being Fe and inevitable impurities.
  • the welding current is 260 to 340A
  • the welding voltage is 28 to 38V (increases with current)
  • the average welding speed is 2.0 to 10.1cm / min (adjusted during welding)
  • the average wire protrusion length is 30mm
  • the welding length The thickness was 400 mm. In either case, welding was performed by using a gas of CO 2 alone as the shielding gas and providing a gas shielding system different from the normal arc welding nozzle.
  • No. 9 to 11 and 14 are multi-layer welding, and in each layer other than the first layer, gas shield arc welding with weaving is performed with a welding current of 270 to 360 A and a welding voltage of 28 to 37 V. Finished the welded joint. Nos. 1 to 8, 12, 13, 15, 16, and 17 finished the welded joint as a single layer weld.
  • the bead width and the joint depth were measured by observing the cross-sectional macrostructure at 5 points arbitrarily selected.
  • the maximum value of the measured value was made into the bead width W in the first layer welding
  • the minimum value of the measured value was made into the joining depth D in the first layer welding.
  • vE0 (J) was measured, and the toughness of the weld metal was evaluated according to the following criteria. ⁇ : vE0 (J) is 47J or more ⁇ : vE0 (J) is less than 47J and 27J or more ⁇ : vE0 (J) is less than 27J

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  • Engineering & Computer Science (AREA)
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  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

L'invention concerne un procédé de soudage à l'arc sous protection gazeuse à rainure verticale étroite pour mettre en oeuvre un soudage monocouche ou un soudage multicouche utilisant un mouvement de balancement pour joindre deux matériaux d'acier épais comportant, en tant que condition de rainure prescrite, une épaisseur de plaque d'au moins 10 mm ; un fil de soudage contenant une quantité prescrite de REM est utilisé ; et le mouvement de balancement pour le soudage de la couche initiale est réalisé à l'aide d'un chalumeau de soudage pourvu d'une partie courbée et d'une partie pointe d'extrémité, délimitée par la partie courbée ; et à ce moment, lors de la mise en oeuvre du mouvement de balancement par rapport à une surface de rainure des matériaux d'acier épais, la partie pointe d'extrémité du chalumeau de soudage est amenée à osciller en direction de la surface de rainure du matériau d'acier épais dans des conditions prescrites.
PCT/JP2017/025615 2016-08-24 2017-07-13 Procédé de soudage à l'arc sous protection gazeuse à rainure verticale étroite WO2018037754A1 (fr)

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CN201780045727.3A CN109641306B (zh) 2016-08-24 2017-07-13 立式窄坡口气体保护弧焊方法
KR1020197006883A KR102126667B1 (ko) 2016-08-24 2017-07-13 수직 방향 협개선 가스 실드 아크 용접 방법
JP2017554533A JP6439882B2 (ja) 2016-08-24 2017-07-13 立向き狭開先ガスシールドアーク溶接方法

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WO2019182081A1 (fr) * 2018-03-22 2019-09-26 Ｊｆｅスチール株式会社 Procédé de soudage à l'arc à protection gazeuse pour tôles d'acier
WO2020054717A1 (fr) * 2018-09-10 2020-03-19 Ｊｆｅスチール株式会社 Procédé de fabrication d'un joint de soudure verticale sur chanfrein étroit et joint de soudure verticale sur chanfrein étroit
CN115338516A (zh) * 2022-08-31 2022-11-15 南京钢铁股份有限公司 一种适用于高强度超厚钢板的双丝气电立焊的焊接方法
WO2023169088A1 (fr) * 2022-03-07 2023-09-14 江苏科技大学 Procédé de soudage électrique sous gaz rapide à arc oscillant, et chalumeau soudeur associé et son application

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WO2020054717A1 (fr) * 2018-09-10 2020-03-19 Ｊｆｅスチール株式会社 Procédé de fabrication d'un joint de soudure verticale sur chanfrein étroit et joint de soudure verticale sur chanfrein étroit
JPWO2020054717A1 (ja) * 2018-09-10 2020-10-22 Ｊｆｅスチール株式会社 立向き狭開先溶接継手の製造方法および立向き狭開先溶接継手
WO2023169088A1 (fr) * 2022-03-07 2023-09-14 江苏科技大学 Procédé de soudage électrique sous gaz rapide à arc oscillant, et chalumeau soudeur associé et son application
CN115338516A (zh) * 2022-08-31 2022-11-15 南京钢铁股份有限公司 一种适用于高强度超厚钢板的双丝气电立焊的焊接方法

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CN109641306A (zh) 2019-04-16
JP6439882B2 (ja) 2018-12-19

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