NO20161607A1 - Metallic flux-cored wire for Ar-CO2 mixed gas shielded ARC welding - Google Patents
Metallic flux-cored wire for Ar-CO2 mixed gas shielded ARC welding Download PDFInfo
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- NO20161607A1 NO20161607A1 NO20161607A NO20161607A NO20161607A1 NO 20161607 A1 NO20161607 A1 NO 20161607A1 NO 20161607 A NO20161607 A NO 20161607A NO 20161607 A NO20161607 A NO 20161607A NO 20161607 A1 NO20161607 A1 NO 20161607A1
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- flux
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- welding
- outer skin
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- 238000003466 welding Methods 0.000 title claims description 58
- 229910000831 Steel Inorganic materials 0.000 claims description 58
- 239000010959 steel Substances 0.000 claims description 58
- 230000004907 flux Effects 0.000 claims description 43
- 150000001875 compounds Chemical class 0.000 claims description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 239000000843 powder Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 4
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 description 69
- 239000002184 metal Substances 0.000 description 69
- 238000005336 cracking Methods 0.000 description 30
- 239000011324 bead Substances 0.000 description 26
- 239000002893 slag Substances 0.000 description 17
- 238000012360 testing method Methods 0.000 description 15
- 239000007789 gas Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 239000011734 sodium Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 150000002222 fluorine compounds Chemical class 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 235000019353 potassium silicate Nutrition 0.000 description 4
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910006639 Si—Mn Inorganic materials 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000009863 impact test Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910002551 Fe-Mn Inorganic materials 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 2
- 239000004111 Potassium silicate Substances 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 2
- 229910052913 potassium silicate Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 235000013024 sodium fluoride Nutrition 0.000 description 2
- 239000011775 sodium fluoride Substances 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910020440 K2SiF6 Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910018594 Si-Cu Inorganic materials 0.000 description 1
- 229910008465 Si—Cu Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229940060037 fluorine Drugs 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 235000019000 fluorine Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- 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
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
-
- 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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- 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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
-
- 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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3607—Silica or silicates
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
- Arc Welding In General (AREA)
Description
METALLIC FLUX-CORED WIRE FOR Ar-C02MIXED GAS SHIELDED ARC
WELDING
BACKGROUND
Technical Field
[0001] The present invention relates to a metallic flux-cored wire for Ar-C02mixed gas shielded are welding (hereinafter, referred to as a metallic flux-cored wire for Ar-C02welding) suitable for obtaining a weld metal providing a stable are and an extremely small amount of spatter occurring, and håving excellent slag removability, an excellent bead appearance/shape, excellent cracking resistance, proper proof stress, proper strength, and proper low-temperature toughness when short are welding (short circuit transfer) in a low current region is performed in gas shielded are welding of high tension steel in a class of a proof stress of 460 MPa or more.
Related Art
[0002] In welding execution for an oceanic structure, a line pipe, or the like, vertical welding or overhead welding is required because a member cannot be rotated or inverted. When an initial layer of a welding joint is executed by single side penetration welding, stable short circuit transfer is required in welding without a backing material or a backing metal, but an are becomes unstable easily and penetration welding is dif f icult in a rutile flux-cored wire. Therefore, gas shielded are welding using a solid wire or a metallic flux-cored wire is mainly applied.
[0003] Above all, a metallic flux-cored wire for Ar-C02welding has a smaller globule than a solid wire or a metallic flux-cored wire for C02gas shielded are welding, and therefore can make a bead shape flat and excellent without generating a large spatter. The metallic flux-cored wire for Ar-C02welding has a low degree of slagging due to oxidation of an alloying agent or a deoxidizer such as Mn or Si, and therefore can reduce the amount of slag formation. Furthermore, the metallic flux-cored wire for Ar-C02welding is also effective for improving low-temperature toughness of a weld metal due to a low content of oxygen in a weld metal, and therefore is widely applied.
[0004] Various developments have been performed for the metallic flux-cored wire for Ar-C02welding. For example, JP 2009-255164 A discloses a metallic flux-cored wire for Ar-C02welding providing a reduced amount of slag formation by reduction of a content of a metal oxide or the like, an extremely small amount of spatter occurring, an excellent bead shape, and excellent low-temperature toughness of a weld metal due to regulation of a content of oxygen in iron powder to a low value. However, the metallic flux-cored wire for Ar-C02welding described in JP 2009-255164 A is a flux-cored wire for welding soft steel or high tension steel in a class of 490 MPa, and has such a problem that a sufficient proof stress of a weld metal cannot be obtained and low-temperature toughness is not sufficient in welding steel in a class of 4 60 MPa.
[0005] JP 2000-197991 A discloses a flux-cored wire for mixed gas shielded are welding providing a small amount of slag formation and capable of obtaining a flat bead shape in horizontal fillet welding. However, the flux-cored wire described in JP 2000-197991 A has such a problem that a sufficient proof stress of a weld metal, sufficient tensile strength thereof, or sufficient low-temperature toughness thereof cannot be obtained.
[0006] JP 2007-144516 A discloses a metallic flux-cored wire for Ar-C02welding containing a large amount of alloy powder. However, the metallic flux-cored wire for Ar-C02welding described in JP 2007-144516 A contains Ti, and therefore generates a large amount of Ti oxide, resulting in occurring of a large amount of slag on a surface of a welding bead to deteriorate welding weldability disadvantageously.
SUMMARY
[0008] Therefore, the present invention has been achieved in view of the above problems. An object thereof is to provide a metallic flux-cored wire for Ar-C02mixed gas shielded are welding providing a stable are, an extremely small amount of spatter occurring, excellent slag removability, an excellent bead appearance/shape, excellent cracking resistance, excellent proof stress of a weld metal, excellent strength thereof, and excellent low-temperature toughness thereof, in short are welding in a low current region in gas shielded are welding of high tension steel at a proof stress of 460 MPa or more used for a steel structure or the like.
[0009]
In order to solve the above problems, the present inventors made various studies for obtaining a component
composition of a metallic flux-cored wire for Ar-C02welding capable of securing a proof stress of 460 MPa or more of a weld metal, strength thereof, and low-temperature toughness thereof, and providing excellent cracking resistance, a stable are, an extremely small amount of spatter occurring, and excellent
welding weldability such as excellent slag removability or an excellent bead appearance/shape, in short are welding (short circuit transfer) in a low current region in Ar-C02mixed gas shielded are welding of high tension steel at a proof stress of 460 MPa or more.
[0010] As a result, the present inventors have found that it is effective to adjust a total content of a Na compound and a K compound in terms of Na20 and K20, a total content of a fluor ine compound in terms of F, and a content of iron powder in order to obtain a stable are and reduce the amount of spatter occurring. In addition, the present inventors have found that a small content of Si02makes a bead appearance/shape excellent and adjustment of an Si content further makes the bead appearance/shape excellent. Furthermore, the present inventors have found that adjustment of an S content in a wire can improve slag removability.
[0011] In addition, the present inventors have found that adjustment of contents of C, Si, Mn, Cu, and Ni in a wire can secure a proof stress of a weld metal and strength thereof, and can improve low-temperature toughness at the same time.
[0012] Furthermore, the present inventors have found that further adjustment of contents of Ni and S can prevent high-temperature cracking and elimination of a seam of a steel outer skin can prevent low temperature cracking.
[0013] That is, an abstract of the present invention is as follows.
[0014]
(1) A metallic flux-cored wire for Ar-C02mixed gas
shielded are welding obtained by filling a flux into a steel outer skin, including, in terms of % by mass with respect to a total mass of the wire, as a total in the steel outer skin and the flux, 0.1 to 0.2% of C, 0.5 to 1.8% of Si, 1.3 to 3.0% of Mn, 0.05 to 0.45% of Cu, and 0.005 to 0.015% of S, and further including, in terms of % by mass with respect to the total mass of the wire, in the flux, 0.005 to 0.050% of a fluorine compound in terms of F in total, 0.01 to 0.20% of Si02, 0.02 to 0.15% of
a Na compound and a K compound in terms of Na20 and K20 in total, and4.0 to 10.5% of iron powder, the balance being Fe in the steel outer skin, a Fe component of an iron alloy, and inevitable impurities.
[0015] (2) The metallic flux-cored wire for Ar-C02mixed gas shielded are welding according to (1), further including 0,5 to 1.5% of Ni in terms of % by mass with respect to a total mass of the wire, as a total in the steel outer skin and the flux.
[0016] (3) The metallic flux-cored wire for Ar-C02mixed gas shielded are welding according to (1) or (2) , in which a seam in the molded steel outer skin is eliminated by welding a joint of the steel outer skin.
[0017] According to the metallic flux-cored wire for Ar-C02mixed gas shielded are welding to which the present invention is applied, a welding efficiency and a quality of a welded part can be improved. For example, a weld metal providing a stable are, capable of largely reducing a work for removing a slag or a spatter, håving an excellent bead shape and excellent cracking resistance, capable of securing a proper proof stress and proper strength, and håving excellent low-temperature toughness can be obtained in short are welding in a low current region.
DETAILED DESCRIPTION
[0018] Hereinafter, compositions of components of a metallic flux-cored wire for Ar-C02welding according to an embodiment of the present invention, contents thereof, and a reason for limiting the contents of the components will be described. The content of each component will be represented by % by mass with respect to a total mass of the wire. The % by mass will be represented simply by %.
[0019]
(C: 0.1 to 0.2% as a total in steel outer skin and flux)
C improves a proof stress of a weld metal and strength thereof. However, when a content of C is less than 0.1%, this effeet cannot be obtained, and a sufficient proof stress of a weld metal or sufficient strength thereof cannot be obtained. On the other hand, when the content of C is more than 0.2%, C remains in a weld metal excessively, and therefore a proof stress of the weld metal and strength thereof become too high, and low-temperature toughness thereof is reduced. When the content of C is more than 0.2%, an are is unstable, and the amount of spatter occurring is increased. Therefore, the content of C is set to be from 0.1 to 0.2% as a total in the steel outer skin and the flux. C can be added from metal powder, alloy powder, or the like in the flux in addition to a component
included in the steel outer skin.
[0020]
(Si: 0.5 to 1.8% as a total in steel outer skin and flux)
Si improves a proof stress of a weld metal, strength thereof, and low-temperature toughness thereof, increases viscosity of a molten metal, and adjusts a bead shape. However, when a content of Si is less than 0.5%, a proof stress of the weld metal, strength thereof, and low-temperature toughness thereof are reduced. When the content of Si is less than 0.5%, viscosity of the molten metal is insufficient ( and a bead has a protruding shape. On the other hand, when the content of Si is more than 1. 8%, a proof stress of the weld metal and strength thereof become too high, and low-temperature toughness thereof is reduced. Therefore, the content of Si is set to be from 0.5 to 1.8% as a total in the steel outer skin and the flux. Si can be added from metal Si or alloy powder such as Fe-Si or Fe-Si-Mn in the flux in addition to a component included in the steel outer skin.
[0021]
(Mn: 1.3 to 3.0% as a total in steel outer skin and flux)
Mn remains in a weld metal, and thereby increases a proof stress of the weld metal, strength thereof, and low-temperature toughness thereof. Mn generates MnS in the weld metal, and increases high-temperature cracking resistance of the weld metal. However, when a content of Mn is less than 1.3%, these effects cannot be obtained, a sufficient proof stress of the weld metal, sufficient strength thereof, or sufficient low-temperature toughness thereof cannot be obtained, and high-temperature cracking resistance is reduced. On the other hand, when the content of Mn is more than 3.0%, Mn remains in the weld metal excessively, a proof stress of the weld metal and strength thereof become too high, and low-temperature toughness thereof is reduced. Therefore, the content of Mn is set to be from 1.3 to 3.0% as a total in the steel outer skin and the flux. Mn can be added from metal Mn or alloy powder such as Fe-Mn or Fe-Si-Mn in the flux in addition to a component included in the steel outer skin.
[0022]
(Cu: 0.05 to 0.45% as a total in steel outer skin and flux)
Cu has a precipitation strengthening action, lowers a trans formation temperature, makes a structure of a weld metal fine, and stabilizes low-temperature toughness. However, when a content of Cu is less than 0.05%, this ef feet cannot be obtained, and stable low-temperature toughness of the weld metal cannot be obtained. On the other hand, when the content of Cu is more than 0.45%, precipitation embrittlement occurs, and low-temperature toughness of the weld metal is reduced. When the content of Cu is more than 0.45%, high-temperature cracking occurs easily. Therefore, the content of Cu is set to be from 0.05 to 0.45% as a total in the steel outer skin and the flux. Cu can be added from metal Cu or alloy powder such as Fe-Si-Cu in the flux in addition to a component included in the steel outer skin and a Cu plating component formed on a surface of the steel outer skin.
[0023]
(S: 0.005 to 0.015% as a total in steel outer skin and flux)
S acts as a slag flocculant and a slag removing agent. However, when a content of S is less than 0.005%, the effects cannot be obtained, and slag removability thereof is deteriorated. On the other hand, when the content of S is more than 0.015%, low-temperature toughness of a weld metal is reduced, and high-temperature cracking occurs easily. Therefore, the content of S is set to be from 0.005 to 0.015% as a total in the steel outer skin and the flux. S can be added from iron sulfide or the like in the flux in addition to a component included in the steel outer skin.
[0024]
(Si02included in flux: 0.01 to 0.20%)
Si02makes fitting at a bead toe of weld excellent and makes a bead appearance/shape excellent, but increases the amount of slag formation and increases a content of oxygen in a weld metal. Therefore, it is necessary to limit an addition amount of Si02. However, when a content of Si02is less than 0.01%, fitting of a weld bead at a bead toe of weld is poor, and a bead appearance/shape is poor. On the other hand, when the content of Si02is more than 0.20%, a content of oxygen in the weld metal is increased, and low-temperature toughness is reduced. Therefore, the content of Si02in the flux is set to be from 0.01 to 0.20%. Si02can be added from silica sand in the flux, a solid component of water glass formed of sodium silicate and potassium silicate, and the like.
[0025]
(Total content of fluorine compound in terms of F in flux: 0.005 to 0.050%)
A fluorine compound stabilizes an are. However, when a total content of the fluorine compound in terms of F is less than 0.005%, this effect cannot be obtained sufficiently, and the are is unstable. On the other hand, when the total content of the f luorine compound in terms of F is more than 0.050%, the are is unstable, and the amount of spatter occurring is
increased. Therefore, the total content of the fluorine
compound in terms of F is set to be from 0.005 to 0.050%. The f luorine compound can be added from CaF2, NaF, Li F, MgF2, K2SiF6, Na3AlF6, A1F3, or the like. The content in terms of F is a total content of F included therein.
[0026]
(Na compound and K compound in flux in terms of Na20 and K20 in total: 0.02 to 0.15%)
A Na compound and a K compound make an are soft and
stabilize the are. However, when a total content of the Na compound and the K compound in terms of Na20 and K20 is less than 0.02%, the are is unstable, and the amount of spatter occurring is increased. On the other hand, when the total
content of the Na compound and the K compound in terms of Na20 and K20 is more than 0.15%, the are is strong, and the amount of spatter occurring is increased. In addition, fitting at a bead toe of weld is poor, and a bead appearance/shape is poor. Therefore, the total content of the Na compound and the K
compound in terms of Na20 and K20 in the flux is set to be from 0.02 to 0.15%. The Na compound and the K compound can be added from potassium feldspar in the flux, a solid component of water glass formed of sodium silicate and potassium silicate, and powder of sodium fluoride, potassium silicofluoride, or the
like.
[0027]
{Iron powder in flux: 4.0 to 10.5%)
Iron powder is added from the flux in order to secure a high welding property which is a characteristic of a metallic flux-cored wire and to adjust components. However, when a content of iron powder is less than 4.0%, the high welding property is reduced, and a bead appearance/shape is poor. In addition, when the content of iron powder is less than 4.0%, an are is unstable, and the amount of spatter occurring is increased. On the other hand, when the content of iron powder is more than 10.5%, a flux filling ratio is varied in a wire longitudinal direction in a stretching step in manufacturing, the are is unstable, and the amount of spatter occurring is increased. Therefore, the content of iron powder in the flux is set to be from 4.0 to 10.5%.
[0028] The metallic flux-cored wire for Ar-C02 welding according to an embodiment of the present invention more preferably uses hydrogen-reduced iron powder, atomized iron powder, or the like håving a content of oxygen of 0.25% or less. Use of the iron powder håving a low content of oxygen makes it possible to suppress a content of oxygen in a weld metal to 0.05% or less without adding a strong deoxidizer to increase the amount of slag formation, such as Ti, Al, Mg, or Zr, and therefore makes it possible to further improve low-temperature toughness of the weld metal.
[0029]
(Ni: 0.5 to 1.5% as a total in steel outer skin and flux)
Ni secures low-temperature toughness of a weld metal, and improves hardenability of the weld metal, a proof stress thereof, and strength thereof. However, when a content of Ni is less than 0.5%, this effect cannot be obtained sufficiently, and a required proof stress of the weld metal, required strength thereof, or required low-temperature toughness thereof cannot be obtained. On the other hand, when the content of Ni is more than 1.5%, a proof stress of the weld metal and strength thereof are too high, and low-temperature toughness thereof is reduced. When the content of Ni is more than 1.5%, high-temperature cracking occurs easily. Therefore, the content of Ni in the flux is set to be from 0.5 to 1.5%. Ni can be added from metal Ni or metal powder such as Fe-Ni in the flux in addition to a component included in the steel outer skin. In a metallic flux-cored wire for Ar-C02welding to which an embodiment of the present invention is applied, it is not essential to set the content of Ni to a range of 0.5 to 1.5% as a total in the steel outer skin and the flux. Even when the content of Ni is outside this range or no Ni is included, hardenability of a weld metal, a proof stress thereof, strength thereof, and low-temperature toughness thereof satisfy performance expected by an embodiment of the present invention.
[0030]
(Elimination of seam of steel outer skin)
The metallic flux-cored wire for Ar-C02welding according to an embodiment of the present invention has a structure
obtained by molding a steel outer skin into a pipe-like shape and filling a flux thereinto. The kind of the wire is roughly classified into a wire håving no seam in a molded steel outer skin obtained by welding a joint of the steel outer skin, and a wire håving a seam in a steel outer skin without welding a joint of the steel outer skin. The wire håving no seam in the steel outer skin is preferable because the wire håving no seam in the steel outer skin can be subjected to a heat treatment for reducing a total content of hydrogen in the wire, a flux after manufacturing does not absorb moisture, and therefore it is possible to reduce a content of diffusion hydrogen in the weld metal and to improve low-temperature cracking resistance.
[0031] The balance of the metallic flux-cored wire for Ar-C02welding to which an embodiment of the present invention is applied is Fe in the steel outer skin, a Fe component of iron alloy powder such as a Fe-Mn alloy, a Fe-Si-Mn alloy, or an Fe-Ni alloy, and inevitable impurities. The inevitable impurities are not particularly specif ied, but a content of P is pref erably 0.010% or less from a viewpoint of high-temperature cracking. Ti generates a Ti oxide and increases the amount of slag formation to deteriorate welding weldability. Therefore, it is preferable to add no Ti.
[0032]
A flux filling ratio is not particularly specified, but is pref erably from 8 to 20% with respect to the total mass of
the wire from a viewpoint of productivity.
[0033] The shielding gas during welding is a mixed gas of Ar-5 to 25% C02for reducing a content of oxygen in a weld metal.
[Examples]
[0034] Hereinafter, effeets of an embodiment of the present invention will be described in more detail with Examples.
[0035] First, a steel outer skin made of JIS G3141 SPCCband steel was molded into a U-shape, and was dried to remove water sufficiently therefrom. A flux was filled into the steel outer skin. Thereafter, a seamless wire obtained by welding a joint of the steel outer skin and a seamed wire obtained by crimping steel outer skins were formed into pipes and were stretched to experimentally manufacture flux-cored wires including various components and each håving a wire diameter of 1.2 mm as indicated in Table 1. A flux filling ratio was from 10 to 18%.
[0036]
[0037] The experimentally manufactured wires were subjected to examination of welding weldability, a welding cracking test, and a deposited metal test using a steel plate def ined by JIS G 3126 SLA 365. Welding conditions for these tests are
indicated in Table 2.
[0038]
[0039] For the evaluation of welding weldability, an are state, the amount of spatter occurring, slag removability, and a bead appearance/shape were examined under welding conditions indicated in Table 2 using horizontal fillet welding.
[0040] In the welding cracking test, a test body was welded under welding conditions indicated in Table 2 at a preheated temperature of 50°C in conformity with a y-shape welding cracking test method (JIS Z 3158), and presence of high-temperature cracking was examined. Thereafter, presence of low-temperature cracking of surface cracking or cross section cracking (f ive cross sections) was examined for the test body 72 hours after welding by penetrant testing (JIS Z 2343) .
[0041] In the deposited metal test, welding was performed in conformity with JIS Z 3111 under welding conditions indicated in Table 2 . Test pieces for a tensile test (No. AO) and an impact test (V notch test piece) were collected from a center part of a deposited metal in a plate thickness direction, and were subjected to a mechanical test. In evaluation of a proof stress and tensile strength, a test piece håving a 0.2% proof stress of 460 to 600 MPa and tensile strength of 570 to 680 MPa was evaluated as being excellent. In evaluation of toughness, a Charpy impact test was performed at -60°C, each test piece was subjected to a Charpy impact test repeatedly, and a test piece håving an average of three absorption energies of 65 J or more was evaluated as being excellent. Results of these tests are indicated in Table 3 collectively.
[0042]
[0043] In Tables 1 and 3, wire Nos. Al to A9 indicate Examples of the present invention, and wire Nos. Bl to B14 indicate Comparative Examples. The wire Nos. Al to A9 as Examples of the present invention had compositions of components within a range specified in an embodiment of the present invention. Therefore, the wire Nos. Al to A9 had excellent welding weldability, caused no high-temperature cracking or low-temperature cracking, and had an excellent proof stress of a deposited metal, excellent tensile strength thereof, and an excellent absorption energy thereof. In this way, the wire Nos. Al to A9 obtained extremely satisfactory results. Each of the wire symbols A2, A5, and A8 had a seam in a steel outer skin, but had a proper proof stress of a weld metal and proper tensile strength thereof, and therefore caused no low-temperature cracking. Each of the wire symbols A5 and A7 included no Ni, but included other components at compositions within a range of an embodiment of the present invention. Therefore, in the wire symbols A5 and A7, hardenability of a weld metal, a proof stress thereof, strength thereof, and low-temperature toughness thereof satisfied performance expected by an embodiment of the present invention.
[0044] The wire symbol Bl in Comparative Examples included a large amount of C, and therefore had a high proof stress of a deposited metal, high tensile strength thereof, and a low absorption energy thereof. In addition, an are was unstable,
and the amount of spatter occurring was large.
[0045] The wire symbol B2 included a small amount of C, and therefore had a low proof stress of a deposited metal and low tensile strength thereof. In addition, the wire symbol B2 included a large total amount of a fluorine compound in terms of F. Therefore, an are was unstable, and the amount of spatter occurring was large.
[0046] The wire symbol B3 included a large amount of Si, and therefore had a high proof stress of a deposited metal, high tensile strength thereof, and a low absorption energy thereof. In addition, the wire symbol B3 had a seam in a steel outer skin, and therefore caused low-temperature cracking.
[0047] The wire symbol B4 included a small amount of Si, and therefore had a low proof stress of a deposited metal, low tensile strength thereof, a low absorption energy thereof, and poor bead appearance/shape. In addition, a total content in terms of Na20 and K20 was small, and therefore an are was unstable and the amount of spatter occurring was large. Furthermore, the wire symbol B4 included no Ni for improving a proof stress of a deposited metal, tensile strength thereof, and low-temperature toughness thereof, and therefore did not exhibit these effeets.
[0048]
The wire symbol B5 included a large amount of Mn, and therefore had a high proof stress of a deposited metal, high tensile strength thereof, and a low absorption energy thereof . In addition, the wire symbol B5 included a large amount in terms of Na20 and K20 as a total. Therefore, an are was unstable, the amount of spatter occurring was large, and a bead
appearance/shape was poor. In addition, the wire symbol B5 had a seam in a steel outer skin, and therefore caused low-temperature cracking.
[0049] The wire symbol B6 included a small amount of Mn, and therefore had a low proof stress of a deposited metal, low tensile strength thereof, and a low absorption energy thereof. In addition, the wire symbol B6 caused high-temperature cracking. The wire symbol B6 included Ni for improving a proof stress of a deposited metal, tensile strength thereof, and low-temperature toughness thereof, but the content thereof was small. Therefore, the wire symbol B6 did not exhibit these effects sufficiently.
[0050] The wire symbol B7 included a large amount of Cu, therefore had a low absorption energy of a deposited metal, and caused high-temperature cracking.
[0051] The wire symbol B8 included a large amount of Si02, and therefore had a large content of oxygen in a deposited metal and a low absorption energy.
[0052] The wire symbol B9 included a large total amount of a f luorine compound in terms of F. Therefore, an are was unstable, and the amount of spatter occurring was large. The wire symbol B10 included a small amount of Si02/and therefore had a poor bead appearance/shape. In addition, the wire symbol B10
included a large amount of Ni, and therefore had a high proof stress of a deposited metal, high tensile strength thereof, and a low absorption energy thereof. In addition, the wire symbol B10 caused high-temperature cracking. In addition, the wire symbol B10 had a seam in a steel outer skin, and therefore caused low-temperature cracking.
[0053] The wire symbol Bil included a small amount of Cu, and therefore had a low absorption energy of a deposited metal. In addition, the wire symbol Bli included a large amount of iron powder. Therefore, an are was unstable, and the amount of
spatter occurring was large.
[0054] The wire symbol B12 included a small amount of S, and therefore had poor slag removability. In addition, the wire symbol B12 included a small amount of iron powder. Therefore, an are was unstable, the amount of spatter occurring was large, and a bead appearance/shape was poor.
[0055] The wire symbol B13 included a large amount of S, and therefore had a low absorption energy of a deposited metal. In addition, the wire symbol B13 caused high-temperature cracking. Furthermore, the wire symbol B13 included a small total amount of a f luorine compound in terms of F. Therefore, an are was unstable.
[0056] The wire symbol B14 included a small amount of Si, and therefore had a low proof stress of a deposited metal, low tensile strength thereof, a low absorption energy thereof, and a poor bead appearance/shape. The wire symbol B14 included no Ni for improving a proof stress of the deposited metal, tensile strength thereof, and low-temperature toughness thereof, and therefore did not exhibit these effeets.
Claims (3)
1. A metallic flux-cored wire for Ar-C02mixed gas shielded are welding obtained by filling a flux into a steel outer skin, comprising: in terms of % by mass with respect to a total mass of the wire, as a total in the steel outer skin and the flux, 0.1 to 0.2% of C; 0.5 to 1.8% Of Si; 1.3 to 3.0% of Mn; 0.05 to 0.45% Of Cu; and 0.005 to 0.015% of S, and further comprising: in terms of % by mass with respect to the total mass of the wire, in the flux, 0.005 to 0.050% of a f luorine compound in terms of P in total; 0.01 to 0.20% of Si02; 0.02 to 0.15% of a Na compound and a K compound in terms of Na20 and K20 in total; and 4.0 to 10.5% of iron powder, the balance being Fe in the steel outer skin, a Fe component of iron alloy powder, and inevitable impurities.
2. The metallic flux-cored wire for Ar-C02mixed gas shielded are welding according to claim 1, further comprising 0.5 to 1.5% of Ni, in terms of % by mass with respect to a total mass of the wire, as a total in the steel outer skin and the flux.
3. The metallic flux-cored wire for Ar-C02mixed gas shielded are welding according to claim 1 or 2, wherein a seam in the molded steel outer skin is eliminated by welding a joint of the steel outer skin.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015202789A JP6377591B2 (en) | 2015-10-14 | 2015-10-14 | Metal flux cored wire for Ar-CO2 mixed gas shielded arc welding |
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| Publication Number | Publication Date |
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| NO20161607A1 true NO20161607A1 (en) | 2017-04-17 |
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| NO20161607A NO20161607A1 (en) | 2015-10-14 | 2016-10-06 | Metallic flux-cored wire for Ar-CO2 mixed gas shielded ARC welding |
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| Country | Link |
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| JP (1) | JP6377591B2 (en) |
| NO (1) | NO20161607A1 (en) |
| SG (1) | SG10201608334VA (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3970909A4 (en) * | 2019-07-09 | 2022-10-19 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Flux-cored wire for ar-co2 mixed gas |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107186379A (en) * | 2017-05-12 | 2017-09-22 | 天长市通联焊业有限公司 | A kind of low-alloy structural steel flux-cored wire and preparation method thereof |
| CN107350659B (en) * | 2017-07-17 | 2019-10-25 | 洛阳双瑞特种合金材料有限公司 | 460MPa grade seamless flux-cored wire and manufacturing method suitable for all-position welding |
| JP7260316B2 (en) * | 2019-02-05 | 2023-04-18 | 日鉄溶接工業株式会社 | High current density gas-shielded arc welding method |
| JP7221812B2 (en) * | 2019-06-17 | 2023-02-14 | 日鉄溶接工業株式会社 | Flux-cored wire for Ar-CO2 mixed gas shielded arc welding of high-strength steel |
| JP7247081B2 (en) * | 2019-12-12 | 2023-03-28 | 日鉄溶接工業株式会社 | Metallic flux-cored wire for gas-shielded arc welding |
| CN113579549B (en) * | 2021-08-11 | 2023-07-04 | 山东索力得焊材股份有限公司 | Metal powder core type flux-cored wire |
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| JP4603399B2 (en) * | 2005-03-29 | 2010-12-22 | 新日本製鐵株式会社 | Metal-based flux-cored wire and welding method |
| JP4676940B2 (en) * | 2005-10-20 | 2011-04-27 | 新日本製鐵株式会社 | Manufacturing method of metal-based flux cored wire with low slag and high fatigue strength welded joint |
| JP5207994B2 (en) * | 2008-03-26 | 2013-06-12 | 日鐵住金溶接工業株式会社 | Metal flux cored wire for Ar-CO2 mixed gas shielded arc welding |
| JP2012081514A (en) * | 2010-10-14 | 2012-04-26 | Nippon Steel Corp | Fillet arc welding method of galvanized steel sheet |
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Cited By (1)
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|---|---|---|---|---|
| EP3970909A4 (en) * | 2019-07-09 | 2022-10-19 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Flux-cored wire for ar-co2 mixed gas |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2017074599A (en) | 2017-04-20 |
| SG10201608334VA (en) | 2017-05-30 |
| JP6377591B2 (en) | 2018-08-22 |
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| CHAD | Change of the owner's name or address (par. 44 patent law, par. patentforskriften) |
Owner name: NIPPON STEEL WELDING & ENGINEERING CO., JP |