WO2022004032A1 - ガスシールドアーク溶接方法、構造物の製造方法及びシールドガス - Google Patents

ガスシールドアーク溶接方法、構造物の製造方法及びシールドガス Download PDF

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WO2022004032A1
WO2022004032A1 PCT/JP2021/003997 JP2021003997W WO2022004032A1 WO 2022004032 A1 WO2022004032 A1 WO 2022004032A1 JP 2021003997 W JP2021003997 W JP 2021003997W WO 2022004032 A1 WO2022004032 A1 WO 2022004032A1
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volume
mass
gas
less
welding
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PCT/JP2021/003997
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English (en)
French (fr)
Japanese (ja)
Inventor
直樹 迎井
真弓 阿部
正道 鈴木
崇功 上月
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株式会社神戸製鋼所
川崎重工業株式会社
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Application filed by 株式会社神戸製鋼所, 川崎重工業株式会社 filed Critical 株式会社神戸製鋼所
Priority to CN202180042685.4A priority Critical patent/CN115916445A/zh
Priority to AU2021299003A priority patent/AU2021299003C1/en
Priority to KR1020227040039A priority patent/KR20230003531A/ko
Publication of WO2022004032A1 publication Critical patent/WO2022004032A1/ja

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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
    • 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
    • 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
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
    • 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
    • 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

Definitions

  • the present invention relates to a gas shielded arc welding method for welding using a shield gas containing Ar as a main component, a structure manufacturing method, and a shield gas.
  • a shield gas is used to protect the molten metal (hereinafter, also referred to as a molten pool) from the adverse effects of nitrogen and oxygen in the atmosphere.
  • the composition of the shield gas is variously optimized depending on the steel type of the welding wire and the welding base material (hereinafter, also simply referred to as “base material” or “work”) used, and the application of the structure to be manufactured.
  • base material also simply referred to as “base material” or “work”
  • Ar is mainly used for the purpose of suppressing the oxygen content of the weld metal after welding and ensuring excellent mechanical performance, especially toughness.
  • As a component it is common to use a mixed gas containing a small amount of O 2 or CO 2 as a shield gas.
  • Patent Document 1 discloses a flux-containing wire made of a metal oxide, a carbonate, a metal fluoride and a metal powder with a stainless steel or nickel alloy as an outer skin.
  • the flux-cored wire according to Reference 1 as a flux component, a TiO 2 5 ⁇ 10% by weight relative to the total wire weight, the SiO 2 0 ⁇ 1.5 wt%, the carbonate 0.1-1 wt% It is characterized by containing 1 to 30% by weight of a metal powder mixture having a metal fluoride content of 0.05 to 0.5% by weight in terms of the amount of fluorine and a silicon content of 0.1 to 1.5% by weight.
  • Patent Document 2 a mug for welding high Cr steel containing 8% by weight or more and 13% by weight or less of Cr using a solid wire containing 8% by weight or more and 13% by weight or less of Cr.
  • Welding shield gas is disclosed.
  • the shield gas for MAG welding has one layer and one pass, and the ratio of the thickness H1 of the pair of base materials and the groove distance W1 between these base materials is 0.4 or less. This is for welding a narrow groove having a tip angle ⁇ 1 of 10 ° or less.
  • Patent Document 2 is characterized in that the shield gas is composed of a three-kind mixed gas of carbon dioxide gas of 17% by volume or less, helium gas of 30% by volume or more and 80% by volume or less, and the balance of argon gas. It is disclosed that the penetration is improved.
  • Patent Document 1 assumes only a shield gas having an Ar gas of 80% or less, and does not consider the toughness of the weld metal. Further, the welding material used is limited to the flux-cored wire, and no consideration is given to the solid wire. For example, when a wire containing flux is used, the flux itself contains a large amount of an oxide having a low work function, and this oxide acts as a cathode point for emitting electrons, so that high arc stability can be obtained. On the other hand, when a solid wire is used, the higher the ratio of Ar in the shield gas, the more difficult it is for the cathode point to be formed on the surface of the molten metal, so that arc deflection occurs frequently and the arc becomes unstable. Therefore, when a solid wire is used, fusion failure is more likely to occur in a high Ar atmosphere than when a flux-cored wire is used.
  • the shield gas described in Patent Document 2 is composed of a three-kind mixed gas of carbon dioxide gas (CO 2 ), helium gas (He) and argon gas (Ar), and the content of He gas is 30 to 30.
  • the composition is 80% by volume, and He gas occupies most of the shield gas.
  • He gas is known to be in short supply worldwide these days, and since it is a high-cost gas, it cannot be said to be a gas that can be used for general purposes.
  • the welding condition to which the shield gas described in Patent Document 2 is applied is one layer and one pass, and the ratio of the thickness H1 of the pair of base materials and the groove distance W1 between these base materials is 0.4 or less.
  • the groove angle ⁇ 1 is limited to welding to narrow grooves of 10 ° or less. Therefore, there is a demand for the development of a welding method capable of performing welding without using He gas and without particularly limiting the welding conditions.
  • the present invention has been made in view of the above problems, and has Ar as a main component, which is a general-purpose gas, and has high arc stability regardless of conditions such as the type and shape of the welding material and the welding base material. It is an object of the present invention to provide a gas shielded arc welding method capable of suppressing fusion defects, a method for manufacturing a structure using the welding method, and a shield gas used in the welding method.
  • the present inventors have reduced the amount of molecular gas having oxygen atoms such as CO 2 and O 2, which is a shield gas containing Ar as a main component, and CO. It has been found that it is effective to use a shield gas in which the contents of 2 and H 2 and their relative ratios are appropriately controlled.
  • the above object of the present invention is achieved by the configuration of the following [1] according to the gas shielded arc welding method.
  • a gas shielded arc welding method in which a welding wire is used as an electrode and a shield gas is flowed through a welded region of a welding base material for welding.
  • the shield gas is based on the total volume of the shield gas.
  • CO 2 0.5% by volume or more and 2.0% by volume or less
  • H 2 0.5% by volume or more and 3.0% by volume or less
  • Contains The rest is Ar and unavoidable impurities
  • preferred embodiments of the present invention relating to the gas shielded arc welding method relate to the following [2] to [6].
  • the welding wire is used with respect to the total mass of the welding wire.
  • Cr 18% by mass or more and 28.5% by mass or less
  • Ni 8.0% by mass or more and 37.0% by mass or less
  • Contains The gas shielded arc welding method according to [1] or [2], which has a structure having a ferrite percentage of 15.3% or less based on a DeLong organization chart.
  • the welding wire is used with respect to the total mass of the welding wire.
  • C 0.20% by mass or less (including 0% by mass)
  • Si 1.00% by mass or less (including 0% by mass)
  • Mn 4.8% by mass or less (including 0% by mass)
  • P 0.03% by mass or less (including 0% by mass)
  • S 0.03% by mass or less (including 0% by mass)
  • Cu 4.0% by mass or less (including 0% by mass)
  • Mo 4.0% by mass or less (including 0% by mass)
  • Nb 1.0% by mass or less (including 0% by mass)
  • N 0.30% by mass or less (including 0% by mass)
  • the gas shielded arc welding method according to [3].
  • the welded region of the welding base material has a groove and has a groove.
  • the groove has one type of groove shape selected from V type, Les type, I type, K type, X type, J type and U type.
  • the gas shielded arc welding method according to any one of [1] to [4], wherein the groove angle of the groove is 0 to 90 °.
  • the gas flow rate Q of the shield gas is 10 to 30 (liters / minute) or less.
  • the protrusion length L of the welding wire is 10 to 30 (mm) or less, and the welding wire has a protrusion length L of 10 to 30 (mm) or less. Described in any one of [1] to [5], wherein the ratio of the gas flow rate Q (liters / minute) to the protrusion length L (mm) satisfies the following formula (4).
  • Gas shield arc welding method 0.5 ⁇ Q / L ⁇ 2.2 ... (4)
  • the shield gas is based on the total volume of the shield gas.
  • CO 2 0.5% by volume or more and 2.0% by volume or less
  • H 2 0.5% by volume or more and 3.0% by volume or less
  • Contains The rest is Ar and unavoidable impurities
  • the content of the CO 2 with respect to the total volume of the shield gas is [CO 2 ] by volume%
  • the content of the H 2 with respect to the total volume of the shield gas is [H 2 ] by volume
  • the following formula (1) is [H 2 ] by volume
  • a method for manufacturing a structure which is characterized by satisfying the formula (2). 1.30 ⁇ [CO 2 ] + [H 2 ] ⁇ 4.40 ... (1) 0.35 ⁇ [H 2 ] / ([CO 2 ] + [H 2 ]) ⁇ 0.74 ...
  • arc stability is high and fusion failure can be suppressed regardless of conditions such as the type and shape of the welding material and the welding base material. Further, according to the method for manufacturing a structure according to the present invention, it is possible to manufacture a good joint in which the occurrence of fusion defects is suppressed.
  • FIG. 1 is an organizational chart of DeLong when the vertical axis is nickel equivalent (%) and the horizontal axis is chromium equivalent (%).
  • FIG. 2 is a schematic view showing an example of a welding apparatus that can be used in the present invention.
  • FIG. 3 shows the test No. Sample No. in T1 It is a drawing substitute photograph which shows the cross section of the weld metal of B1 (welding current 150A).
  • FIG. 4 shows the test No. Sample No. in T16. It is a drawing substitute photograph which shows the cross section of the weld metal of B16 (welding current 150A).
  • FIG. 5 is a drawing substitute photograph showing the appearance of the bead of the test plate welded by the method of the present invention.
  • FIG. 6 is a drawing substitute photograph showing a cross section of the weld metal of the test plate welded by the method of the present invention.
  • the gas shielded arc welding method according to the present invention is a method in which a consumable electrode (hereinafter, also referred to as a welding wire) is supplied via a welding torch and welding is performed while the shield gas is allowed to flow in the welded region of the welding base material. Become. Since the present invention also relates to the shield gas used in the above welding method, first, the shield gas according to the present invention will be described.
  • the shield gas according to the present invention contains CO 2 (carbon dioxide) and H 2 (hydrogen), and the balance is composed of Ar (argon) and unavoidable impurities.
  • the shield gas is used to protect the molten metal from the adverse effects of atmospheric nitrogen and oxygen, while the shield gas contains molecular gases having oxygen atoms such as CO 2 and O 2. If so, oxygen atoms contained in the shield gas enter the molten metal.
  • the shield gas according to the present invention contains Ar gas, which is a general-purpose inert gas, as a main component while minimizing the amount of molecular gas having an oxygen atom.
  • the shield gas which is dominated by Ar gas, has a problem that fusion failure occurs due to arc instability and decrease in arc force due to arc deflection.
  • the low oxygen content of the weld metal is maintained by appropriately controlling the contents of CO 2 gas and H 2 gas and using Ar gas of 95% by volume or more as the balance. While maintaining arc stability and arc force, it is possible to achieve suppression of fusion defects.
  • the CO 2 gas is a gas that contributes to arc stability
  • the H 2 gas is a gas that contributes to arc force.
  • ⁇ CO 2 0.5% by volume or more and 2.0% by volume or less>
  • CO 2 easily dissociates into atoms in the arc and takes dissociation heat from the arc, which contributes to the contraction effect of the arc.
  • the ratio of the potential gradient of CO 2 when air is 1 is 1.5.
  • the dissociated O oxygen atom
  • the dissociated O reacts with the deoxidizing element on the molten pool to form an oxide on the surface of the molten pool, and this oxide acts as a cathode point to suppress arc deflection and arc. Is stable.
  • the dissociated O enters the molten metal, the amount of oxygen in the weld metal may increase as a result, so that CO 2 in the shield gas needs to be appropriately controlled.
  • the CO 2 content in the shield gas is 0.5% by volume or more, preferably 0.6% by volume or more, and more preferably 0.9% by volume or more with respect to the total volume of the shield gas. ..
  • the CO 2 content in the shield gas shall be 2.0% by volume or less with respect to the total volume of the shield gas. Further, when the CO 2 content in the shield gas is preferably 1.5% by volume or less, more preferably 1.1% by volume or less with respect to the total volume of the shield gas, oxygen entering the molten metal is further suppressed. Therefore, more excellent toughness can be ensured.
  • the shield gas contains CO 2
  • C (carbon) or CO (carbon monoxide) is generated at the time of dissociation, and the action of reducing O adsorbed on the surface of the molten pool works.
  • CO 2 carbon
  • CO carbon monoxide
  • it is a molecular gas, it can suppress oxygen entering the molten metal as much as possible.
  • Such an effect of CO 2 cannot be replaced by a molecular gas having another oxygen atom, for example, O 2 which is mentioned as a general-purpose one for welding.
  • CO 2 is selected as a molecular gas having an oxygen atom that ensures arc stability while suppressing an increase in oxygen content of the weld metal and maintaining a good bead appearance.
  • H 2 is a molecule having a higher potential gradient than other molecules, and the ratio of the potential gradient of H 2 when air is 1 is set to 10. This is because the dissociation voltage of H 2 is extremely low, and a large amount of dissociation heat is taken away, which greatly contributes to the contraction effect of the arc.
  • H 2 has a reducing effect and also has an effect of suppressing oxygen entering the molten metal.
  • the H 2 content in the shield gas is 0.5% by volume or more, preferably 0.8% by volume or more, and more preferably 1.0% by volume or more with respect to the total volume of the shield gas. ..
  • the H 2 content in the shield gas is 3.0% by volume or less, preferably 2.8% by volume or less, based on the total volume of the shield gas.
  • Ar gas is also called an inert gas or a noble gas because Ar is a monatomic molecule and has a property of not forming a stable chemical bond.
  • Ar gas contains the above CO 2 and H 2 , and the balance is Ar and unavoidable impurities, and the Ar content is not particularly limited.
  • the Ar content in the shield gas is preferably 95% by volume or more, more preferably more than 95% by volume, and further preferably 96% by volume or more with respect to the total volume of the shield gas. ..
  • the Ar content in the shield gas is preferably 98.5% by volume or less, more preferably 98.1% by volume or less, based on the total volume of the shield gas.
  • the ratio of the potential gradient of Ar when air is 1 is 0.5.
  • Examples of the unavoidable impurities that can be contained in the shield gas according to the present invention include oxygen, nitrogen, water and the like. Of the above unavoidable impurities, the smaller the oxygen content, the better, and if the O 2 content in the shield gas is 0.02% by volume or less with respect to the total volume of the shield gas, the effect of the present invention is hindered. No. Further, the content of other unavoidable impurities is also better as it is smaller, and if the content of each component other than O 2 in the shield gas is 0.03% by volume or less with respect to the total volume of the shield gas, respectively. , Does not interfere with the effect of the present invention.
  • the total amount of unavoidable impurities contained in the shield gas is preferably 0.05% by volume or less, more preferably 0.03% by volume or less, based on the total volume of the shield gas. ..
  • both CO 2 and H 2 are components that contribute to the arc contraction effect and have the effect of improving the arc stability. Therefore, in the present invention, the optimum range of the total amount thereof is also limited. do.
  • the CO 2 content with respect to the total volume of the shield gas is [CO 2 ] by volume% and the H 2 content is [H 2 ] by volume%
  • [CO 2 ] + [H 2 ] is less than 1.30. If there is, one or both of the effect of suppressing fusion failure and the effect of improving arc stability due to the arc contraction effect cannot be obtained.
  • [CO 2 ] + [H 2 ] exceeds 4.40, the austerity effect of the arc becomes excessive and arc instability occurs.
  • the CO 2 content and the H 2 content shall satisfy the following formula (1).
  • the value obtained by [CO 2 ] + [H 2 ] is preferably 1.50 or more, more preferably 1.90 or more, and preferably 4.30 or less, 3.90. The following is more preferable.
  • the present invention also limits the optimum range for the ratio of the H 2 content to the total amount of the CO 2 content and the H 2 content. That is, the total amount of the CO 2 content and the H 2 content satisfies the above formula (1), and the ratio of H 2 to the total amount satisfies the following formula (2). Only in certain cases, the effect of suppressing fusion defects and the arc stability, which are the effects of the present invention, are exhibited.
  • the CO 2 content and the H 2 content shall satisfy the following formula (2).
  • the value obtained by [H 2 ] / ([CO 2 ] + [H 2 ]) is preferably 0.40 or more, more preferably 0.47 or more, and 0.70 or less. It is preferably 0.67 or less, and more preferably 0.67 or less.
  • the present invention by appropriately controlling the CO 2 content, H 2 content, and Ar content in the shield gas, the occurrence of fusion defects can be suppressed and the arc stability can be improved. Can be improved.
  • the effect of each of these gases on suppressing fusion defects and improving arc stability is determined by the potential gradient ratio when air is 1.
  • the value obtained by 0.5 ⁇ [Ar] + 1.5 ⁇ [CO 2 ] + 10 ⁇ [H 2 ] is more preferably 59.0 or more, further preferably 63.0 or more. It is more preferably 79.0 or less, and further preferably 78.0 or less.
  • the shield gas according to the present invention is a mixed gas in which the CO 2 content and the H 2 content are appropriately controlled and the balance is composed of Ar and unavoidable impurities. It is preferable to use a gas cylinder (hereinafter, also referred to as a gas cylinder) in which the gas is enclosed, or a method in which these gases are mixed and used using a gas mixer. A method of ejecting the mixed gas from one nozzle using a mixer is more preferable. On the other hand, in the method of mixing in the vicinity of the molten metal using the double shield gas method using two nozzles on the outside and the inside, the composition of the gas becomes non-uniform, and the effect of the present invention may not work. ..
  • the active gas is locally present, which may adversely affect the familiarity and glossiness. There can be sex. Therefore, it is desirable not to use the method of mixing in the vicinity of the molten metal because the effect of the present invention may not be fully exhibited.
  • the form of the welding wire used in the welding method according to the present invention is not particularly limited, and may be a solid wire or a flux-cored wire.
  • the solid wire is a wire-like wire having a solid wire cross section.
  • the surface of the solid wire may or may not be copper-plated, but it may be in either form.
  • the flux-cored wire is composed of a tubular outer skin and a flux filled inside the outer skin.
  • the flux-cored wire may be in either a seamless type having no seam on the outer skin or a seam type having a seam on the outer skin.
  • the flux-cored welding wire may or may not be copper-plated on the wire surface (outside of the outer skin).
  • the material of the outer skin is not particularly limited, and may be mild steel or stainless steel, and the composition with respect to the total mass of the weld wire can be selected according to the required characteristics of the welded structure, and is not particularly limited.
  • the total mass of the welding wire refers to the total mass of the components in the outer skin and the flux.
  • the outer skin include ordinary steel, SUH409L (JIS G 4312: 2001), SUS430, SUS304L, SUS316L, SUS310S (all JIS G 4305: 2012) and the like.
  • the welding wire is preferably austenitic stainless steel.
  • the Cr content and Ni content in the welding wire are both JIS Z3321: 2013 (stainless steel filler rod for welding, solid wire and steel strip) or JIS Z3323: 2007 (stainless steel arc welding flux-containing wire and wire and steel strip). It is preferably within the range specified by the filler rod). Specifically, the Cr content in the welding wire is preferably 18% by mass or more and 28.5% by mass or less with respect to the total mass of the welding wire.
  • the Ni content in the welding wire is preferably 8.0% by mass or more and 37.0% by mass or less with respect to the total mass of the welding wire.
  • FIG. 1 is an organizational chart of DeLong when the vertical axis is nickel equivalent (%) and the horizontal axis is chromium equivalent (%).
  • the weld wire has a structure of 15.3% or less in a ferrite percentage, and austenitic base material is used to shield the weld wire. Even when hydrogen is contained in the gas, it is preferable because it can suppress the occurrence of cracks in the weld metal.
  • the region exceeding the range of nickel equivalent and chromium equivalent shown in the DeLong organization chart shown in FIG. 1 is based on the straight line shown in the DeLong organization chart.
  • the weld wire has a structure consisting only of austenite, or a structure consisting of austenite and ferrite and having a structure having a ferrite percentage of 15.3% or less. It is preferable because it can further prevent cracking of the weld metal.
  • the welding wire that can be used in the present invention contains C, Si, Mn, P, S, Cu, Mo, Nb and N as optional elements in addition to the above-mentioned Cr and Ni. You may.
  • the steel grade of the welding wire suitable for combination with the shield gas according to the present invention is austenitic stainless steel. Therefore, the preferred range of the content of these arbitrary elements is JIS Z3321: 2013 (stainless steel filler rod for welding, solid wire and steel strip) or JIS Z3323: 2007 (wire and filler rod containing stainless steel arc welding flux). It is preferable that the content is not more than the maximum value of the content of each element specified in 1. Further, it is more preferable that the welding wire contains these optional elements and the balance is Fe and unavoidable impurities.
  • C 0.20% by mass or less (including 0% by mass)>
  • C is a component that affects the strength or corrosion resistance of the weld metal, and the lower the C content in the weld wire, the better the corrosion resistance. Therefore, the smaller the C content in the weld wire, the more preferably 0% by mass. May be.
  • the C content in the welded wire is 0.20 mass with respect to the total mass of the wire. % Or less is more preferable.
  • Si 1.00% by mass or less (including 0% by mass)>
  • Si is an element that is a component that improves the strength of the weld metal, but on the other hand, it is also a component that deteriorates the toughness, so the Si content in the weld wire may be 0% by mass.
  • the welding wire contains Si as an arbitrary element in order to adjust the mechanical performance of the obtained weld metal, specifically, the Si content in the welding wire is 1.00 mass with respect to the total mass of the wire. % Or less is more preferable.
  • Mn is a component that improves the strength of the weld metal, but in the present invention, the Mn content in the weld wire may be 0% by mass.
  • the Mn content in the welded wire is 4.8 mass with respect to the total weight of the wire. % Or less is more preferable.
  • Cu is a component that improves the strength and corrosion resistance of the weld metal, but in the present invention, the Cu content in the welded wire may be 0% by mass.
  • the total Cu content in the welded wire and plated is more preferably 4.0% by mass or less with respect to the total mass of the wire.
  • Mo 4.0% mass or less (including 0%)> Mo is a component that improves high-temperature strength and corrosion resistance, but on the other hand, it is also a component that promotes ⁇ embrittlement, so that the Mo content in the weld wire may be 0% by mass.
  • the welded wire contains Mo as an optional element in order to adjust the mechanical performance and corrosion resistance of the obtained weld metal, specifically, the Mo content in the welded wire is 4 with respect to the total mass of the welded wire. More preferably, it is 0.0% by mass or less.
  • Nb has the effect of stabilizing C by forming carbides, and is a component that suppresses the formation of Cr oxides and improves corrosion resistance.
  • the carbides referred to here also include complex compounds containing C such as charcoal sulfides and charcoal nitrides.
  • the Nb content in the welding wire is 0% by mass. You may.
  • the Nb content in the welding wire is 1.0% by mass with respect to the total mass of the welding wire.
  • Ti may be contained in the same range as Nb.
  • N 0.30% by mass or less (including 0%)>
  • N is a component that penetrates into the crystal structure and solid-solves to improve the strength and pitting corrosion resistance.
  • the N content in the weld wire may be 0% by mass.
  • the welded wire contains N as an optional element in order to adjust the mechanical performance and porcelain resistance of the obtained weld metal, specifically, the N content in the welded wire is relative to the total mass of the welded wire. It is preferably 0.30% by mass or less.
  • the welding wire that can be used in the gas shielded arc welding method according to the present invention contains V, Sn, Na, Co, Ca, Li, Sb, W, As and the like as unavoidable impurities in addition to the above elements. Will be done.
  • O is also contained as an impurity.
  • the welding device is not particularly limited as long as it is a welding device that performs gas shielded arc welding, and a welding device used for conventional gas shielded arc welding can be used.
  • a semi-automatic welding device, an automatic welding device using a mobile carriage, a welding robot system, and the like can be mentioned.
  • FIG. 2 is a schematic view showing an example of a welding apparatus that can be used in the present invention.
  • a welding torch 11 is attached to the tip thereof, and a robot 10 for moving the welding torch 11 along a welding line of a work W and a welding wire are supplied to the welding torch 11.
  • a wire supply unit (not shown)
  • a welding power supply unit 30 that supplies a current to the consumable electrode via the wire supply unit to generate an arc between the consumable electrode and the material to be welded.
  • the welding device includes a robot control unit 20 that controls the robot operation for moving the welding torch 11, and further includes a teaching pendant 40 that serves as an interface for inputting a command from the operator to the robot control unit 20. ..
  • the posture of the welding torch may be perpendicular to the base metal or may be tilted.
  • the angle formed by the vertical line with respect to the base metal and the torch is called the advance angle
  • the vertical line with respect to the base metal is tilted.
  • the angle formed by the torch is called the receding angle.
  • shield gas flow rate Q 10 to 30 (liters / minute)>
  • the shield gas flow rate Q contributes to the shielding property for protecting the molten metal from the atmosphere.
  • the shield gas flow rate Q is 10 (liters / minute) or more, sufficient shielding properties can be ensured.
  • the shield gas flow rate Q is 30 (liters / minute) or less, the gas flow suppresses turbulence and becomes a stable laminar flow. Therefore, from the viewpoint of ensuring the shielding property, the shield gas flow rate Q is preferably 10 to 30 (liters / minute), and from the viewpoint of further ensuring the familiarity and glossiness of the beads, the shield gas flow rate Q is 15. More preferably, it is ⁇ 25 (liters / minute).
  • the protruding length L of the weld wire also contributes to the shielding property for protecting the molten metal from the atmosphere.
  • the protruding length L of the welding wire is 30 mm or less, it is possible to suppress the change in the gas composition due to the entrainment of the atmosphere and secure sufficient shielding property. Further, when the protrusion length L of the welding wire is 10 mm or more, damage to the contact tip and the shield nozzle due to arc heat can be suppressed.
  • the protrusion length L of the welding wire is preferably 10 to 30 mm, and the arc stability is ensured after suppressing the thermal damage and ensuring the weldability for a long time.
  • the protrusion length L of the weld wire is more preferably 15 to 20 mm.
  • the shield gas flow rate Q and the protrusion length L of the welding wire it is preferable to appropriately control the shield gas flow rate Q and the protrusion length L of the welding wire, and control the ratio of the shield gas flow rate Q to the protrusion length L.
  • the Q / L is 0.5 or more, a more preferable shielding property can be secured, and when the Q / L is 2.2 or less, the gas flow can protect the arc region in a more stable laminar flow state. Therefore, the ratio of the shield gas flow rate Q to the protrusion length L preferably satisfies the following equation (4).
  • the groove shape of the welding base material is not particularly limited, but is selected from, for example, V type, Les type, I type, K type, X type, J type and U type. It can be one type of groove shape.
  • the groove angle is not limited, but the groove angle is preferably 0 ° or more because an I-shaped groove shape can be applied.
  • the groove angle is preferably 0 to 90 °.
  • the present invention also relates to a method for manufacturing a structure manufactured by gas shielded arc welding using a welding wire and a shield gas whose composition is controlled as described above. It is also preferable that the composition of the welding wire is controlled as described above.
  • Welding was performed according to the welding test method and welding conditions shown below, and the melting performance, familiarity, glossiness and droplet transfer were evaluated by the methods shown below.
  • the low current welding condition with a welding current of 100 A is a condition usually applied to difficult welding postures such as vertical welding and upward welding. Welding in such a posture usually has a very slow welding speed, so that the heat input to the weld is high, and thus fusion defect defects are unlikely to occur. In this embodiment, downward welding is simply used.
  • flank angle is 90 ° or more, which will be shaped like a fillet joint in the construction of the next pass, it is possible to melt the weld toe to create a joint without fusion defects. Therefore, if the value obtained by (bead width / bead height) is within the above range as a range in which defects can be prevented with a margin, it is accepted.
  • the glossiness was also evaluated as a sensory evaluation when the welding current was 100 A and when the welding current was 150 A.
  • the glossiness at each welding current is evaluated in three stages of 1 to 3, and the total of the glossiness score when the welding current is 100A and the glossiness score when the welding current is 150A is comprehensively evaluated. And said.
  • the evaluation criteria for glossiness are shown in Table 6 below, and the evaluation criteria for comprehensive evaluation of glossiness are shown in Table 7 below.
  • Test No. T1 to T13 have a melting performance because the composition of the shield gas is within the range of the present invention and the formulas (1) and (2) obtained by the CO 2 content and the H 2 content are satisfied. Excellent results were obtained in all of the items of arc stability, familiarity and glossiness.
  • FIG. 3 shows the test No. Sample No. in T1 It is a drawing substitute photograph which shows the cross section of the weld metal of B1 (welding current 150A).
  • FIG. 3 shows an example in which the melting performance test is passed. Test No. In T1 (Sample No. B1), the welding current was 150 A, the value obtained by (bead width / bead height) was 5.2, and the flank angle was 155 °. In the construction in which such a smooth bead toe is formed, it was judged that the resistance to the fusion defect is extremely good.
  • the test No. for T2 to T13 the test No. As with T1, excellent melting performance could be obtained.
  • T1 to T6 especially the test No. In T1 to T3, T5 and T6, since the protrusion length L of the weld wire is in the more preferable range of the present invention, excellent arc stability can be obtained without changing the gas composition due to the entrainment of the atmosphere. rice field.
  • the test No. T7, T8, T11 and T12 are excellent arcs because the values obtained by the formula (2) using the CO 2 content and the H 2 content in the shield gas exceed the more preferable lower limit value of the present invention. I was able to obtain stability.
  • the test No. In T14 the H 2 content in the shield gas exceeds the upper limit of the range of the present invention, and also exceeds the upper limits specified in the formulas (1) and (2) obtained by the CO 2 content and the H 2 content. Therefore, the arc stability was lowered.
  • the H 2 content in the shield gas is less than the lower limit of the range of the present invention, and is also less than the lower limit specified in the formulas (1) and (2) obtained by the CO 2 content and the H 2 content. Therefore, the melting performance was low.
  • FIG. 4 shows the test No. Sample No. in T16. It is a drawing substitute photograph which shows the cross section of the weld metal of B16 (welding current 150A).
  • FIG. 4 shows an example in which the melting performance test fails.
  • Test No. In T16 (Sample No. B16), the welding current was 150 A, the value obtained by (bead width / bead height) was 3.2, and the flank angle was 125 °.
  • Test No. No. 17 has a melting performance because the CO 2 content in the shield gas exceeds the upper limit of the range of the present invention and is less than the lower limit specified in the formula (2) obtained by the CO 2 content and the H 2 content. Became low.
  • Test No. Reference numeral 18 is that the H 2 content in the shield gas is less than the lower limit of the range of the present invention, and is also less than the lower limit specified in the formulas (1) and (2) obtained by the CO 2 content and the H 2 content. Therefore, the melting performance was low.
  • FIG. 5 is a drawing substitute photograph showing the appearance of the bead of the test plate welded by the method of the present invention.
  • FIG. 6 is a drawing substitute photograph showing a cross section of the weld metal of the test plate shown in FIG.
  • SUS304L having a plate thickness of 12 mm is used as a welding base material, the groove angle is 45 °, and the above test No. This is a three-layer, three-pass vertical welding performed under the conditions of T1.
  • the joint obtained by the method of the present invention was able to obtain sufficient penetration and a smooth bead shape.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Arc Welding In General (AREA)
  • Nonmetallic Welding Materials (AREA)
PCT/JP2021/003997 2020-06-29 2021-02-03 ガスシールドアーク溶接方法、構造物の製造方法及びシールドガス WO2022004032A1 (ja)

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CN202180042685.4A CN115916445A (zh) 2020-06-29 2021-02-03 气体保护电弧焊方法、结构物的制造方法和保护气体
AU2021299003A AU2021299003C1 (en) 2020-06-29 2021-02-03 Gas shielded arc welding method, structure object production method, and shielding gas
KR1020227040039A KR20230003531A (ko) 2020-06-29 2021-02-03 가스 실드 아크 용접 방법, 구조물의 제조 방법 및 실드 가스

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60130496A (ja) * 1983-12-20 1985-07-11 Mitsubishi Heavy Ind Ltd ステンレス鋼溶接材料
JP2005515899A (ja) * 2002-02-01 2005-06-02 レール・リキード−ソシエテ・アノニム・ア・ディレクトワール・エ・コンセイユ・ドゥ・スールベイランス・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード 亜鉛めっき部品のブレーズ溶接に用いることができる三元ガス混合物
JP2007296535A (ja) * 2006-04-27 2007-11-15 Kobe Steel Ltd ガスシールドアーク溶接フラックス入りワイヤ及び溶接方法

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JP2001025893A (ja) 1999-07-15 2001-01-30 Nof Corp ステンレス鋼またはニッケル合金溶接用フラックス入りワイヤ
JP2013046932A (ja) 2012-10-18 2013-03-07 Toshiba Corp マグ溶接用シールドガス，マグ溶接方法，および溶接構造物

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60130496A (ja) * 1983-12-20 1985-07-11 Mitsubishi Heavy Ind Ltd ステンレス鋼溶接材料
JP2005515899A (ja) * 2002-02-01 2005-06-02 レール・リキード−ソシエテ・アノニム・ア・ディレクトワール・エ・コンセイユ・ドゥ・スールベイランス・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード 亜鉛めっき部品のブレーズ溶接に用いることができる三元ガス混合物
JP2007296535A (ja) * 2006-04-27 2007-11-15 Kobe Steel Ltd ガスシールドアーク溶接フラックス入りワイヤ及び溶接方法

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