WO2022139370A1 - 내균열성이 우수한 용접 구조 부재 및 이의 제조방법 - Google Patents
내균열성이 우수한 용접 구조 부재 및 이의 제조방법 Download PDFInfo
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- WO2022139370A1 WO2022139370A1 PCT/KR2021/019411 KR2021019411W WO2022139370A1 WO 2022139370 A1 WO2022139370 A1 WO 2022139370A1 KR 2021019411 W KR2021019411 W KR 2021019411W WO 2022139370 A1 WO2022139370 A1 WO 2022139370A1
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- plating layer
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- structural member
- weld joint
- welded structural
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000003466 welding Methods 0.000 claims description 159
- 238000007747 plating Methods 0.000 claims description 135
- 229910000831 Steel Inorganic materials 0.000 claims description 133
- 239000010959 steel Substances 0.000 claims description 133
- 229910018134 Al-Mg Inorganic materials 0.000 claims description 82
- 229910018467 Al—Mg Inorganic materials 0.000 claims description 82
- 238000001816 cooling Methods 0.000 claims description 64
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- 229910000765 intermetallic Inorganic materials 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 17
- 229910009369 Zn Mg Inorganic materials 0.000 claims description 15
- 229910007573 Zn-Mg Inorganic materials 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 3
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- 229910003023 Mg-Al Inorganic materials 0.000 description 1
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Images
Classifications
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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
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
- B23K9/232—Arc welding or cutting taking account of the properties of the materials to be welded of different metals
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
-
- 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
-
- 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
- B23K35/24—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
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/003—Cooling means
-
- 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
- B23K9/0008—Welding without shielding means against the influence of the surrounding atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- 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
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- 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
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- 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
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/34—Coated articles, e.g. plated or painted; Surface treated articles
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/16—Composite materials, e.g. fibre reinforced
- B23K2103/166—Multilayered materials
Definitions
- the present invention relates to a welded structural member having excellent crack resistance and a method for manufacturing the same.
- Zinc-coated steel sheet has excellent corrosion resistance and is used for various purposes such as automobile members, interior and exterior panels of home appliances, and construction members. Among them, Zn-Al-Mg-based plated steel sheet can secure excellent corrosion resistance for a long time, and the demand is increasing as a substitute for conventional zinc-based plated steel sheet and stainless steel.
- the reason for the improvement in the corrosion resistance of the plated layer compared to the conventional zinc-based plated steel sheet is that a dense and stable corrosion product is uniformly formed on the surface of the plated layer by the action of Mg.
- Patent Document 1 Patent No. 3149129
- Patent Document 2 Patent No. 3179401 Publication
- Patent Document 3 Patent No. 4475787 Publication
- Patent Document 4 Patent No. 3715220
- Patent Document 5 Japanese Patent Laid-Open No. 2005-230912
- One aspect of the present invention is
- At least one of the first steel sheet and the second steel sheet is a plated steel sheet having a Zn-Al-Mg-based plating layer
- the microstructure of the portion closest to the weld joint of the Zn-Al-Mg-based plating layer is an area fraction, and provides a welded structural member containing 20 to 40% of a Zn-Mg-based intermetallic compound.
- water cooling to an average cooling rate of 25 ⁇ 110 °C / s; including,
- At least one of the first steel sheet and the second steel sheet is a plated steel sheet having a Zn-Al-Mg-based plating layer, and provides a method of manufacturing a welded structural member.
- FIG. 1 schematically shows a cross section of a torch and a base material during arc welding.
- FIG. 2 schematically shows the cross-sectional structure of a fillet welded joint.
- FIG. 3 is an enlarged schematic view of a cross-sectional structure corresponding to the vicinity of the bead toe portion shown in FIG. 2 .
- FIG. 4 is an enlarged schematic view of a cross-sectional structure corresponding to the vicinity of a bead toe for a welded structural member manufactured using a conventional Zn-Al-Mg-based plated steel sheet.
- FIG. 5 is a schematic cross-sectional view of a welded structural member manufactured using a Zn-Al-Mg-based plated steel sheet of the present invention by applying water cooling to have a specific cooling rate based on the surface temperature of the weld joint in the state of FIG. 3; is shown as
- FIG. 6 schematically shows a welding method in a test piece.
- FIG 8 shows a photograph taken with an optical microscope (OM) at 500 times the magnification of the microstructure of the plating layer closest to the weld joint for Example 2 of the present invention.
- the plated layer is melted on the surface by the arc heat passing through the plated layer.
- the liquidus temperature of the Zn-Al-Mg-based plating layer is lower than the melting point of Zn at about 420°C, the molten state is maintained for a relatively long time.
- the metal of the molten plated layer during arc welding maintains a liquid phase and the residence time on the surface of the steel sheet is longer. lose
- the present inventors have disclosed that, when manufacturing a welded structural member using a plated steel sheet having a Zn-Al-Mg-based plated layer, cracks when welding using an arc welding method, particularly a solid wire, a flux-cored wire, and a covered arc welding electrode In order to solve this easily occurring problem, a careful review was made.
- the portion closest to the weld joint among the Zn-Al-Mg-based plated layer is As a microstructure, as an area fraction, it is possible to control to contain 20 to 40% of a Zn-Mg-based intermetallic compound, and through this, it was found that cracking due to intrusion of the hot-dip plated layer can be suppressed and completed the present invention. reached
- the method for manufacturing a welded structural member includes preparing a first steel plate and a second steel plate, wherein at least one of the first steel plate and the second steel plate is Zn-Al-Mg It is a plated steel sheet (or Zn-Al-Mg-based plated steel sheet) provided with a plated layer.
- the plated steel sheet having the Zn-Al-Mg-based plating layer refers to a base steel sheet; And it may mean that a Zn-Al-Mg-based plating layer is formed on at least one surface of the base steel sheet. At this time, it may further include an additional layer within the range that does not impair the object of the present invention.
- the holding steel sheet various steel types can be employed according to the purpose of the present invention, for example, a high-tensile steel sheet may be used, and a steel sheet having an overall average thickness in the range of 1 to 6 mm may be used (at this time , the thickness direction for measuring the thickness means a direction perpendicular to the rolling direction).
- the base steel sheet one having a composition of 94.5Zn-6.4Al-3.1Mg may be used.
- the counter steel sheet (ie, the remaining steel sheet) joined to the Zn-Al-Mg-based plated steel sheet among the first and second steel sheets may be a Zn-Al-Mg-based plated steel sheet, or a Zn-Al-Mg-based plated steel sheet. It is applicable to all steel plates other than steel plates. That is, the counter steel sheet may also employ various types of steel depending on the use.
- a method for manufacturing a welded structural member by arc welding the first steel plate and the second steel plate using any one welding material selected from a solid wire, a flux-cored wire, and a covered arc welding rod, welding is performed. forming a seam.
- a weld joint is formed using an additional welding material in addition to the first and second steel sheets corresponding to the base material. Therefore, since the physical properties of the weld joint change according to the composition change of the minute weld joint, as described above, in order to obtain a welded structural member excellent in corrosion resistance and crack resistance, the composition of the weld joint is also precisely controlled when arc welding is used. is needed
- the weld joint is C: 0.09 to 0.15%, Si: 0.35 to 0.39%, Mn: 0.87 to 0.90%, P: 0.004 ⁇ 0.022%, S: 0.002 ⁇ 0.014%, Cr: 0.01 ⁇ 0.11%, Ni: 0.01 ⁇ 0.08%, Cu: 0.01 ⁇ 0.06%, Mo: 0.01% or less, Al: 0.01 ⁇ 0.02%, balance Fe and other inevitable It may contain impurities.
- the weld joint is C: 0.05 to 0.10%, Si: 0.47 to 0.53%, Mn: 1.10 to 1.16%, P by weight. : 0.009 to 0.025%, S: 0.007 to 0.018%, Cr: 0.03 to 0.13%, Ni: 0.02 to 0.11%, Cu: 0.02 to 0.08%, Mo: 0.02 to 0.07%, Al: 0.005 to 0.02%, balance Fe and other unavoidable impurities.
- the weld joint is C: 0.06 to 0.14%, Si: 0.42 to 0.49%, Mn: 0.83 to 0.91%, P: 0.015 to 0.035%, S: 0.010 to 0.022%, Cr: 0.07 to 0.20%, Ni: 0.06 to 0.15%, Cu: 0.05 to 0.12%, Mo: 0.05 to 0.10%, Al: 0.01 to 0.02%, balance Fe and It may contain other unavoidable impurities.
- the composition of the weld joint according to the use of each welding material to satisfy the above-mentioned conditions, it is possible to effectively suppress the molten metal embrittlement cracking property, and at the same time, the corrosion resistance of the weld joint is excellent, and the A welded structural member excellent in crackability and bonding property can be provided.
- the step of forming the weld joint may be performed with a heat input of 5 to 8 kJ/cm. If the heat input is less than 5 kJ/cm, there may be a problem of non-uniformity of weld bead formation or poor penetration, and if the heat input is more than 8 kJ/cm, there may be a problem of overlap or leakage.
- FIG. 1 The cross section of the torch and the steel plate to be welded during arc welding used in the present invention is schematically shown in FIG. 1 .
- the welding torch is advancing in the direction of the arrow while forming the arc 4 in the welding site 3 on the surface of the welding steel sheet 1 .
- the shield gas 2 is ejected from the gas nozzle around the electrode and the welding wire located in the center of the welding torch, thereby protecting the arc 4 and the surface of the welding steel sheet 1 exposed to high temperature from the atmosphere.
- the welding torch passes through a part of the welding part 3 by the heat input from the arc 4, it solidifies rapidly and forms the welding bead (welding joint part) comprised from a weld metal.
- FIG. 2 schematically shows the cross-sectional structure of a welded joint formed in the manufacturing process of a welded structural member, and various types of welded joints by arc welding are used in construction, automobile structures, and the like.
- two steel plates to be welded ie, a first steel plate and a second steel plate; 10, 10 ′
- a weld bead 11 is formed on the cross section of one steel plate 10 ′, so that both steel plates are joined to each other.
- a bead toe part 12 an edge intersection formed by meeting the surfaces of the two steel plates 10 and 10 ′ and the surface of the welding bead 11 is called a bead toe part 12 .
- FIGS. 3 to 5 are schematic cross-sectional views of enlarged portions corresponding to the vicinity of the bead toe portion 12 shown in FIG. 2 .
- FIG. 3 schematically shows a cross-sectional state in the vicinity of a high-temperature welded portion immediately after arc heat passes during arc welding when a welded structural member using a Zn-Al-Mg-based plated steel sheet is manufactured.
- the original Zn-Al-Mg-based plating layer is melted in a portion having a certain distance from the bead toe portion 12 , and exists as a Zn-Al-Mg-based hot-dip plating layer 13 .
- the original Zn-Al-Mg-based plating layer exists as an unmelted state 14 in a portion farther from the bead tow portion 12 .
- FIG. 4 schematically shows a cross-sectional view of a welded structural member manufactured using a conventional Zn-Al-Mg-based plated steel sheet.
- the Zn-Al-Mg-based plating layer is lost in the vicinity of the high-temperature welded portion immediately after the arc heat passes during welding, thereby forming the plating layer evaporation section 15 as in FIG. 3 .
- the Zn-Al-Mg-based hot-dip plated layer 13 is wetted and diffused in the plating layer evaporation section 15, and accordingly, the surface of the steel sheet 10 is Zn-Al- It is covered with the Mg-based hot-dip plated layer (13).
- a welded structural member that is excellent in corrosion resistance and capable of suppressing cracking can be manufactured by performing water cooling while precisely controlling cooling conditions after welding. For example, after the welding, based on the surface temperature of the weld joint, water cooling may be performed to an average cooling rate of 25 to 110° C./s. At this time, when the average cooling rate is less than 25 °C / s, there is no short-time solidification effect of the molten plating layer, there may be a problem that the LME is generated. On the other hand, when the average cooling rate exceeds 110° C./s based on the surface temperature of the weld joint, there may be a problem of deterioration in toughness due to martensitic transformation of the material metal.
- FIG. 5 after welding is performed to have a weld joint having the composition of the present invention in the state of FIG. 3, and at the same time precisely controlling the surface temperature of the weld joint during cooling, water cooling is applied to have a specific cooling rate, the present invention It schematically shows a cross-sectional view of a welded structural member manufactured using a Zn-Al-Mg-based plated steel sheet.
- the Zn-Al-Mg-based plating layer evaporates and disappears immediately after welding, so that the Zn-Al-Mg-based hot-dip plating layer is solidified without reaching the surface of the steel sheet in the plating layer evaporation section 15, so that the stress is concentrated. Wetting diffusion by the Zn-Al-Mg-based hot-dip plated layer up to the portion 12 is suppressed. As a result, the plating layer evaporation section 15 is maintained even after cooling.
- the surface of the steel sheet in the vicinity of the bead toe portion 12 is cooled without contact with the Zn-Al-Mg-based hot-dip plated layer, and accordingly, the Zn-Al-Mg-based melting is performed from the bead toe portion 12 .
- a plating layer evaporation section 15 of a certain section is secured between the solidification regions 17 of the plating layer.
- the Zn-Al-Mg-based plated layer evaporates and disappears in the vicinity of the weld bead formed during arc welding. After passing through, the Zn-Al-Mg-based plating layer was melted at a position several mm away from the weld bead, and the hot-dip plating layer formed immediately began to spread to the vicinity of the weld bead.
- the weld bead By suppressing the intrusion of the molten metal layer into the vicinity, it is possible to effectively prevent cracking.
- the wet diffusion of the Zn-Al-Mg-based plated steel sheet member was prevented by applying the optimized water cooling method within a critical time after passing the welding torch.
- the present invention provides a method for manufacturing a welded structural member obtained by welding two steel plates, at least one of which is a Zn-Al-Mg-based plated steel plate, by applying water cooling within a few seconds immediately after welding (that is, after passing the welding torch).
- a welded structural member excellent in crackability can be effectively provided.
- the water cooling may be started within 3 to 10 seconds after passing through the welding torch, and more preferably within 3 to 9 seconds.
- the water cooling start time may be set to 3 seconds or more after passing through the welding torch, since it is a critical time that does not affect the progressing torch, welding performance can be secured.
- the water cooling start time can be set to 10 seconds or less after passing through the welding torch, crack resistance can be ensured by preventing the hot-dip plated layer generated after passing through the welding torch from advancing to the vicinity of the weld bead.
- the flow rate of the water cooling may be 15 ⁇ 60mm 3 /hr.
- the flow rate of the water cooling may be 15 mm 3 /hr or more.
- the cooling effect of the hot-dip plated layer generated after passing through the welding torch can be sufficiently secured.
- the flow rate of the water cooling may be set to 60 mm 3 /hr or less, it is possible to prevent contamination of the work environment due to unnecessary flow rate supply, as well as suppress problems caused by excessive cooling.
- the water cooling may be maintained for 5 to 15 seconds.
- the water cooling holding time may be set to 5 seconds or more, it is possible to sufficiently secure the cooling effect of the hot-dip plated layer by water cooling, thereby securing the effect of improving the crack resistance.
- the water cooling holding time By setting the water cooling holding time to 15 seconds or less, it is possible to prevent contamination of the work environment due to unnecessary flow rate supply, as well as suppress problems caused by excessive cooling.
- the water cooling is most preferably supplied to the torch passing portion within 3 to 10 seconds after passing through the welding torch, and 15 to 60 mm 3 /hr of water cooling flow rate for 5 to 15 seconds.
- the droplet size of the water sprayed to the weld joint can be controlled in the range of 20 ⁇ 100 ⁇ m.
- a welded structural member includes: a first steel plate; a second steel plate; and a welded joint for coupling the first steel plate and the second steel plate.
- first steel plate the second steel plate
- welded joint the description of the method for manufacturing the welded structural member described above is equally applicable.
- the microstructure of the portion closest to the weld joint of the Zn-Al-Mg-based plating layer contains 20 to 40% of the Zn-Mg-based intermetallic compound as an area fraction.
- the portion closest to the weld joint of the Zn-Al-Mg-based plating layer is a 'region in which the plating layer does not exist from the bead toe of the weld joint' corresponding to the evaporation section 15 of the plating layer. Except for up to, it may mean a region from the region closest to the weld joint in the Zn-Al-Mg-based plating layer to the point at which it becomes 10 mm in the rolling direction of the steel sheet.
- the microstructure of the portion closest to the weld joint is in the thickness direction (i.e., from the region closest to the weld joint to the point of 10 mm in the rolling direction of the steel sheet in the Zn-Al-Mg-based plating layer described above). , it can be measured by observing the cut surface in the direction perpendicular to the rolling direction of the steel sheet) with an optical microscope (OM) at 500 times magnification.
- OM optical microscope
- the Zn-Mg-based intermetallic compound corresponds to a matrix structure while the Zn-Al-Mg-based hot-dip plated layer formed immediately after arc welding in the present invention is rapidly cooled by a subsequent water cooling process.
- the Zn-Mg-based intermetallic compound may further include components such as Al in addition to Zn and Mg, for example, Zn/MgZn 2 binary phase and Zn/MgZn 2 /Al 3 An original shape etc. are mentioned.
- the microstructure of the portion closest to the weld joint of the Zn-Al-Mg-based plating layer is 20-40% ( More preferably, 24-38%) contains.
- the area fraction of the Zn-Mg-based intermetallic compound is less than 20%, it is difficult to expect the effect of preventing LME, and if it exceeds 40%, the welding structure desired in the present invention is excellent in both corrosion resistance and crack resistance The member cannot be manufactured.
- the microstructure of the portion closest to the weld joint of the Zn-Al-Mg-based plating layer may include a single Zn phase as a matrix structure, as an area fraction, for example, It may contain 60% or more of Zn single phase.
- the microstructure of the portion closest to the weld joint of the Zn-Al-Mg-based plating layer is a Zn-Al-Mg-based plating layer that has not been melted from the beginning (that is, the Zn-Al- It is formed differently from the microstructure of the Mg-based plating layer (parts other than the portion closest to the weld joint).
- the Zn-Al-Mg-based hot-dip plated layer formed immediately after the above-described arc welding is rapidly cooled by the water cooling process in which the cooling conditions are precisely controlled as described above, and is different from the Zn-Al-Mg-based plated layer that was not melted from the beginning. form microstructure.
- the average diameter of the Zn-Mg-based intermetallic compound is 1 based on the cut surface in the thickness direction (meaning the direction perpendicular to the rolling direction of the steel sheet), It may be in the range of ⁇ 30 ⁇ m.
- the microstructure of the portion closest to the weld joint satisfies the above-described characteristics, so that the molten metal embrittlement cracking property can be effectively suppressed, and thus the corrosion resistance is excellent
- a welded structural member having excellent crack resistance and bonding property can be obtained.
- the hardness of the portion closest to the weld joint of the Zn-Al-Mg-based plating layer may be 69.5% or more (100% or less) compared to the hardness of the plating layer before welding.
- the hardness of the plating layer closest to the weld joint refers to a value obtained by measuring the hardness of the plating layer at the point closest to the bead toe part 12 .
- the distance between the plating layer from the bead toe portion 12 of the weld joint may be 3 to 10 mm, and this plating layer evaporation section 15 ) length can be controlled by applying the water cooling method to meet the average cooling rate in a specific range immediately after welding.
- the length of the evaporation section 15 of the plating layer by making the length of the evaporation section 15 of the plating layer to be 3 mm or more, the occurrence of cracks due to the hot-dip plated metal layer in the vicinity of the bead toe part 12 is prevented, thereby cracking resistance can be obtained
- the length of the evaporation section 15 of the plating layer 10 mm or less it is possible to obtain the effect of securing corrosion resistance by the formation of the plating layer.
- the Zn-Al-Mg-based plating layer is, by weight, Al: 1-20.9%, Al: 1-20.9%, Mg: 0.04-10%, Ti: 0.1% or less ( 0%), B: 0.05% or less (including 0%), Si: 2% or less (including 0%), Fe: 2.5% or less (including 0%), the balance may be composed of Zn and other unavoidable impurities.
- the composition of the plating layer as described above, the object of the present invention of securing crack resistance during welding can be more effectively achieved.
- the plating adhesion per side of the Zn-Al-Mg-based plating layer may be 50 ⁇ 250 g / m 2 .
- the corrosion resistance of the plated steel sheet can be secured by setting the plating adhesion amount per side of the plating layer to 50 g/m 2 or more, and by setting it to 250 g/m 2 or less, blowholes are prevented from occurring during welding, thereby securing the strength of the welded part. have.
- the corrosion resistance effect of the plating layer can be sufficiently secured, and the effect of the anticorrosion method due to the sacrificial action of the plating layer can be sufficiently obtained.
- the evaporation section of the plating layer when the evaporation section of the plating layer is generated in the vicinity of the weld bead generated after passing through the welding torch, it is preferable to control the plating adhesion amount per one side of the plating layer to 50 to 250 g/m 2 , and 50 to 200 g/m 2 It is more preferable to control by m 2 .
- the composition of the plating layer described above reflects the composition for hot-dip plating, and the method of hot-dip plating is not particularly limited, but it is preferable from an economical point of view to use a generally known in-line annealing type hot-dip plating facility.
- the component system of the plating layer will be described preferentially.
- the content unit of each component below is weight %.
- Al improves the corrosion resistance of the plated steel sheet and suppresses the generation of Mg oxide-based dross in the plating bath.
- it is necessary to secure an Al content of 1% or more.
- it is possible to ensure corrosion resistance and dross prevention effect, and by setting it to 20.9% or less, overgrowth of a soft Fe-Al alloy layer on the underside of the plating layer is prevented, and plating adhesion can be secured.
- Mg produces a uniform corrosion product on the surface of the plated layer, thereby remarkably increasing the corrosion resistance of the plated steel sheet.
- the Mg content is more preferably 1% to 5%.
- B in the hot-dip plating bath also increases the alloy range of other components during hot-dip plating, thereby increasing the degree of freedom of manufacturing conditions.
- B by containing B at 0.1% or less, the effect of increasing the alloy range of other components can be exhibited.
- Fe is easy to mix with the characteristic of immersing the steel sheet. Accordingly, Fe may be contained in the plating layer in an amount of 2.5% or less, and by setting the Fe content to 2.5% or less, it is possible to secure the corrosion resistance and quality of the plated steel sheet. On the other hand, more preferably, the Fe content may be 0.0001 to 2.5%, and by setting the Fe content to 0.0001% or more, it is economical because additional cleaning costs do not occur.
- a cold-rolled steel strip having a plate thickness of 1.5 mm and a plate width of 1000 mm having the composition of Table 1 was passed through a hot-dip plating line showing the composition of Table 3, and hot-dip Zn-Al-Mg-based plated steel sheets having various plating layer compositions were manufactured.
- Molten Zn-Al-Mg alloy plating grater plating layer composition Plating with Zn alloy composition of 65% or more (Additional composition range Al:1.0 ⁇ 20.0%, Mg:0.05 ⁇ 10.0%, Ti:0 ⁇ 0.10%, B:0 ⁇ 0.05%, Si:0 ⁇ 2.0%, Fe:0 ⁇ 2.5%) steel plate for plating low carbon steel size Plate thickness 1.5mm, plate width 200mm, plate length 200mm Plating amount 50 ⁇ 250g/m2 on one side welding process gas metal arc welding flux cored welding clad arc welding Welding wire type solid wire flux cored wire Covered Arc Welding Rod Welding wire name / diameter KC-25M / 1.2 mm ⁇ K-71T / 1.2 mm ⁇ KR-3000 / 2.6 mm ⁇ welding gas 80% Ar + 20% CO 2 80% Ar + 20% CO 2 - Welding gas flow 15 L/min 15 L/min - welding current 150A 180A 150A welding voltage 20V 20V - welding speed
- Table 4 shows the results of crack occurrence and hardness value change rate for the above-mentioned experiments.
- arc welding was performed under the welding conditions shown in Table 2 in the center of a 200 mm ⁇ 200 mm test piece (molten Zn-Al-Mg-based plated steel sheet member) to weld between the test pieces. Specifically, after passing the welding starting point S in a clockwise direction from the welding start point S, the beads were also overlapped and the welding proceeded to create the overlapping part of the weld bead, and then welding was performed to the welding end point E. During welding, the test piece 22 was made into the state restrained on the flat plate. This test was conducted under a condition in which molten metal embrittlement cracks could easily occur by giving constraint conditions.
- radioactive non-destructive testing was performed to determine the presence or absence of "melted metal embrittlement cracking", and the results are shown in Table 4 based on the following criteria.
- a cross section perpendicular to the bead direction including the weld bead and its adjacent steel plate was subjected to mirror polishing and etching in a nitric acid concentration of 0.2% by volume nital solution, followed by observation with a scanning electron microscope.
- the length of the plating layer evaporation section 15 shown in FIG. 5 was measured by observing the vicinity of the bead toe part 12, and also the plating layer hardness near the bead toe part 12 after welding and the plating layer hardness before welding were measured, and the rate of change is shown in Table 4 below.
- the microstructure of the portion closest to the weld joint of the Zn-Al-Mg-based plating layer defined in the present invention contains 20-40% of the Zn-Mg-based intermetallic compound, .
- the crack resistance was superior to that of Comparative Examples 1 to 3 that did not satisfy this, and the rate of change of hardness value before and after welding was also 69.5% or more, indicating corrosion resistance was also confirmed to be excellent.
- the microstructure of the Zn-Al-Mg-based plated layer closest to the weld joint was observed, and Inventive Examples 4 to 59
- the microstructure of the part closest to the weld joint contains 20-40% of Zn-Mg-based intermetallic compound and 60% or more of Zn single phase (that is, the remainder Zn single phase) was confirmed.
- the length of the evaporation section 15 of the plating layer in the test piece was less than 3 mm, and the crack caused by the deepest hot-dip metal layer was from the bead toe part 12 in most samples. The distance occurred in a site
- the length of the plating layer evaporation section 15 was also 3 mm or more and 10 mm or less.
- microstructure of the plating layer closest to the weld joint was measured in the same manner as in the above-described specification, and photos using an optical microscope (OM) are shown in FIGS. 7 and 8 .
- FIG. 7 shows the microstructure of the plating layer closest to the weld joint for Comparative Example 10 of the present application, and it was confirmed that the microstructure was homogenized (corresponding to A of FIG. 7 ) under slow cooling conditions.
- FIG. 8 shows the microstructure of the plating layer closest to the weld joint for Example 2 of the present invention, and the matrix structure (corresponding to B of FIG. 8) consisting of a single Zn phase due to the rapid cooling according to the present invention (corresponding to B of FIG. 8) and Zn as a secondary phase -Mg-based intermetallic compound (including binary phase and ternary phase; corresponding to C of FIG. 8), contains the Zn-Mg-based intermetallic compound in the range of 20 to 40%, and the Zn single phase is 60% It was confirmed that the above was included. At this time, it was confirmed that the Zn-Mg-based intermetallic compound had an average diameter of 1 to 30 ⁇ m based on the cut surface in the thickness direction.
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Abstract
Description
성분 (중량%) | C | Si | Mn | Al | Ni | Cr | Mo | 특성 400MPa급 고장력강 |
강재 | 0.17 | 0.01 | 0.5 | 0.03 | 0.015 | 0.03 | 0.003 |
용융 Zn-Al-Mg계 합금도금 강판 |
도금층 조성 | 65% 이상의 Zn 합금조성을 가지는 도금 (추가 조성범위Al:1.0~20.0%, Mg:0.05~10.0%, Ti:0~0.10%, B:0~0.05%, Si:0~2.0%, Fe:0~2.5%) |
||
도금용 강판 | 저탄소강 | |||
사이즈 | 판두께 1.5mm, 판폭 200mm, 판길이 200mm | |||
도금부착량 | 편면 50 ~ 250g/㎡ | |||
용접 프로세스 | 가스 금속 아크용접 | 플럭스 코어드 용접 | 피복 아크 용접 | |
용접와이어 종류 | 솔리드 와이어 | 플럭스 코어드 와이어 | 피복아크 용접봉 | |
용접와이어명 / 직경 | KC-25M / 1.2 mmΨ | K-71T / 1. 2 mmΨ | KR-3000 / 2.6 mmΨ | |
용접가스 | 80% Ar + 20% CO2 | 80% Ar + 20% CO2 | - | |
용접가스 유량 | 15 L/min | 15 L/min | - | |
용접전류 | 150A | 180A | 150A | |
용접전압 | 20V | 20V | - | |
용접속도 | 0.5 m/min | 0.5 m/min | 0.8 m/min | |
비드길이 | 300 ㎜ | 300 ㎜ | 300 ㎜ | |
용접 입엽량 | 3.6 kJ/cm | 4.3 kJ/cm | 3.9 kJ/cm |
구분 | Zn-Al-Mg계 도금층 조성 (질량%, 잔부 Zn) | |||||
Al | Mg | Si | Ti | B | Fe | |
발명예 1 | 4.5 | 0.05 | ||||
발명예 2 | 4.5 | 0.05 | ||||
발명예 3 | 4.5 | 0.05 | ||||
비교예1 | 6.4 | 3.1 | 0.5 | 0.05 | 0.02 | |
비교예2 | 19.1 | 8.9 | 0.5 | 0.3 | ||
비교예3 | 4.4 | 1.2 | 0.5 |
구분 | 용접전 도금층 경도 (Hv) |
도금 부착량 (g/m2) |
테스트 조건 | |
용접와이어 종류 | 평균 냉각 속도 (℃/s) | |||
발명예 1 | 114.2 | 50 | 솔리드 와이어 | 85.8 |
발명예 2 | 114.2 | 50 | 플럭스 코어드 와이어 | 85.2 |
발명예 3 | 114.2 | 50 | 피복아크 용접봉 | 106.9 |
비교예1 | 148.4 | 135 | 솔리드 와이어 | 14.8 |
비교예2 | 205.9 | 135 | 플럭스 코어드 와이어 | 12.8 |
비교예3 | 130.6 | 183 | 피복아크 용접봉 | 11.3 |
구분 | 상기 Zn-Al-Mg계 도금층 중 상기 용접 이음부에 최인접한 부분 | 균열 발생 여부 |
용접후 도금층 경도 변화율 (%) |
|
Zn-Mg계 금속간 화합물의 면적분율 (%) | Zn 단상의 면적분율(%) | |||
발명예 1 | 35.1 | 64.9 | ◎ | 87.2 |
발명예 2 | 28.3 | 71.7 | ◎ | 75.5 |
발명예 3 | 25.7 | 74.3 | ◎ | 73.7 |
비교예1 | 11.2 | 88.8 | X | 55.2 |
비교예2 | 8.7 | 91.3 | X | 53.1 |
비교예3 | 5.3 | 94.7 | X | 53.2 |
성분(중량%) | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | Al |
솔리드 와이어 | 0.13 | 0.40 | 0.87 | 0.012 | 0.01 | 0.021 | 0.013 | 0.015 | - | 0.02 |
플럭스 코어드 와이어 |
0.09 | 0.48 | 1.15 | 0.022 | 0.009 | 0.042 | 0.028 | 0.021 | 0.02 | 0.012 |
피복아크 용접봉 | 0.08 | 0.45 | 0.91 | 0.02 | 0.02 | 0.09 | 0.08 | 0.05 | 0.05 | 0.01 |
구분 | Zn-Al-Mg계 도금층 조성 (질량%, 잔부 Zn) | |||||
Al | Mg | Si | Ti | B | Fe | |
발명예 4 | 6.4 | 3.1 | 0.5 | 0.05 | 0.02 | |
발명예 5 | 19.9 | 9.8 | 0.5 | 0.02 | 0.01 | 0.6 |
발명예 6 | 6.7 | 3.1 | 1.5 | 0.4 | ||
발명예 7 | 6.5 | 3.3 | 0.5 | 0.04 | 0.01 | |
발명예 8 | 14.8 | 7.6 | 1.5 | 2 | ||
발명예 9 | 18.1 | 8.3 | 2 | 2.3 | ||
발명예 10 | 19.1 | 8.9 | 0.5 | 0.3 | ||
발명예 11 | 4.8 | 0.06 | 0.8 | 0.1 | 0.02 | |
발명예 12 | 14.3 | 5.1 | 0.05 | |||
발명예 13 | 0.5 | 1.6 | ||||
발명예 14 | 6.2 | 2.9 | 0.1 | |||
발명예 15 | 20.5 | 9.5 | 0.3 | |||
발명예 16 | 4.5 | 1.1 | 0.5 | |||
발명예 17 | 8.3 | 2.5 | 2.7 | |||
발명예 18 | 21 | 9.9 | 0.11 | 0.01 | ||
발명예 19 | 6.3 | 3 | 0.5 | 0.12 | 0.01 | |
발명예 20 | 15.3 | 6.8 | 1.5 | |||
발명예 21 | 5.5 | 0.9 | ||||
발명예 22 | 21.5 | 8.1 | 2.7 | |||
발명예 23 | 18 | 9.2 | 1.3 | 0.15 | 1.2 | |
발명예 24 | 6.4 | 3.1 | 0.5 | 0.05 | 0.02 | |
발명예 25 | 4.5 | 0.04 | 0.3 | 0.5 | ||
발명예 26 | 6.7 | 3.1 | 1.5 | 0.4 | ||
발명예 27 | 6.5 | 3.3 | 0.5 | 0.04 | 0.01 | |
발명예 28 | 11.2 | 2.8 | 0.2 | |||
발명예 29 | 14.3 | 5.1 | 0.05 | |||
발명예 30 | 14.8 | 7.6 | 1.5 | 2 | ||
발명예 31 | 4.8 | 0.06 | 0.8 | 0.1 | 0.02 | |
발명예 32 | 13.8 | 9.3 | ||||
발명예 33 | 20.9 | 9.8 | 0.5 | 0.02 | 0.01 | 0.6 |
발명예 34 | 18.1 | 8.3 | 2 | 2.3 | ||
발명예 35 | 0.5 | 1.6 | ||||
발명예 36 | 6.2 | 2.9 | 0.1 | |||
발명예 37 | 20.5 | 9.5 | 0.3 | |||
발명예 38 | 4.5 | 1.1 | 0.5 | |||
발명예 39 | 8.3 | 2.5 | 2.7 | |||
발명예 40 | 21 | 9.9 | 0.11 | 0.01 | ||
발명예 41 | 6.3 | 3 | 0.5 | 0.12 | 0.01 | |
발명예 42 | 15.3 | 6.8 | 1.5 | |||
발명예 43 | 5.5 | 0.9 | ||||
발명예 44 | 21.5 | 8.1 | 2.7 | |||
발명예 45 | 18 | 9.2 | 1.3 | 0.15 | 1.2 | |
발명예 46 | 4.5 | 0.04 | 0.3 | 0.5 | ||
발명예 47 | 6.5 | 3.3 | 0.5 | 0.04 | 0.01 | |
발명예 48 | 11.2 | 2.8 | 0.2 | |||
발명예 49 | 4.8 | 0.06 | 0.8 | 0.1 | 0.02 | |
발명예 50 | 12 | 4.9 | 2 | 2.3 | ||
발명예 51 | 11.5 | 4.1 | 0.5 | 0.02 | 0.01 | 0.6 |
발명예 52 | 10.3 | 3.9 | 0.05 | |||
발명예 53 | 0.5 | 1.6 | ||||
발명예 54 | 20.5 | 9.5 | 0.3 | |||
발명예 55 | 4.5 | 1.1 | 0.5 | |||
발명예 56 | 8.3 | 2.5 | 2.7 | |||
발명예 57 | 15.3 | 6.8 | 1.5 | |||
발명예 58 | 5.5 | 0.9 | ||||
발명예 59 | 21.5 | 8.1 | 2.7 | |||
비교예4 | 17.5 | 7.1 | ||||
비교예5 | 12.5 | 0.04 | 0.3 | 0.03 | ||
비교예6 | 6.7 | 1.2 | 1.5 | 0.4 | ||
비교예7 | 6.5 | 3.3 | 0.5 | 0.04 | 0.01 | |
비교예8 | 6.3 | 2.5 | 1.2 | 0.04 | 0.01 | |
비교예9 | 4.4 | 1.2 | 0.5 | |||
비교예10 | 6.3 | 2.5 | 1.2 | 0.04 | 0.01 | |
비교예11 | 21.5 | 8.1 | 2.7 | |||
비교예12 | 14.3 | 5.1 | 0.05 | |||
비교예13 | 6.3 | 3 | 0.5 | 0.12 | 0.01 | |
비교예14 | 4.8 | 0.06 | 0.8 | 0.1 | 0.02 | |
비교예15 | 6.7 | 1.2 | 1.5 | 0.4 | ||
비교예16 | 6.5 | 3.3 | 0.5 | 0.04 | 0.01 | |
비교예17 | 6.7 | 3.1 | 1.5 | 0.4 | ||
비교예18 | 20.5 | 9.5 | 0.3 | |||
비교예19 | 14.3 | 5.1 | 0.05 | |||
비교예20 | 5.5 | 0.9 | ||||
비교예21 | 17.5 | 7.1 |
구분 | 용접전 도금층 경도 (Hv) |
도금 부착량 (g/m2) |
용접 와이어 종류 |
용접후 수냉 개시 소요 시간 (초) |
유량 (mm3/ hr) |
수냉 지속 시간 (초) |
냉각 속도 (℃/s) |
균열 발생 여부 |
용접후 도금층 경도 변화율 (%) |
발명예 4 | 148.4 | 135 | 솔리드 와이어 |
9 | 31 | 10 | 45.4 | ◎ | 71.4 |
발명예 5 | 218.2 | 60 | 솔리드 와이어 |
8 | 28 | 5 | 49.5 | ◎ | 73.5 |
발명예 6 | 166.1 | 110 | 솔리드 와이어 |
3 | 55 | 13 | 85.7 | ◎ | 88.1 |
발명예 7 | 149.9 | 85 | 솔리드 와이어 |
5 | 45 | 8 | 66.9 | ◎ | 83.2 |
발명예 8 | 228.7 | 65 | 솔리드 와이어 |
10 | 21 | 9 | 41.8 | ◎ | 73.4 |
발명예 9 | 246.6 | 125 | 솔리드 와이어 |
8 | 15 | 5 | 49.3 | ◎ | 70.1 |
발명예 10 | 205.9 | 67 | 솔리드 와이어 |
6 | 60 | 8 | 60.2 | ◎ | 71.0 |
발명예 11 | 126.6 | 148 | 솔리드 와이어 |
10 | 12 | 3 | 41.6 | ○ | 69.0 |
발명예 12 | 161.7 | 175 | 솔리드 와이어 |
5 | 48 | 11 | 66.9 | ◎ | 76.3 |
발명예 13 | 125.8 | 34 | 솔리드 와이어 |
8 | 13 | 15 | 49.5 | ○ | 65.2 |
발명예 14 | 140.5 | 92 | 솔리드 와이어 |
15 | 35 | 11 | 29.6 | ○ | 54.0 |
발명예 15 | 204.9 | 180 | 솔리드 와이어 |
5 | 33 | 1 | 66.8 | ○ | 61.3 |
발명예 16 | 129.8 | 45 | 솔리드 와이어 |
8 | 11 | 4 | 49.4 | ○ | 63.3 |
발명예 17 | 172.2 | 80 | 솔리드 와이어 |
13 | 35 | 8 | 33.6 | ○ | 62.1 |
발명예 18 | 206.1 | 40 | 솔리드 와이어 |
3 | 5 | 11 | 83.4 | ○ | 69.3 |
발명예 19 | 148.3 | 25 | 솔리드 와이어 |
4 | 31 | 3 | 75.3 | ○ | 68.1 |
발명예 20 | 195.7 | 290 | 솔리드 와이어 |
12 | 38 | 7 | 36.1 | ○ | 61.0 |
발명예 21 | 121.9 | 240 | 솔리드 와이어 |
12 | 50 | 10 | 36.0 | ○ | 57.3 |
발명예 22 | 225.1 | 155 | 솔리드 와이어 |
8 | 35 | 1 | 49.5 | ○ | 65.2 |
발명예 23 | 232.4 | 180 | 솔리드 와이어 |
4 | 32 | 3 | 75.0 | ○ | 59.1 |
발명예 24 | 148.4 | 135 | 플럭스 코어드 와이어 | 5 | 31 | 10 | 66.7 | ◎ | 70.2 |
발명예 25 | 124.7 | 89 | 플럭스 코어드 와이어 | 6 | 35 | 15 | 59.4 | ◎ | 70.5 |
발명예 26 | 166.1 | 110 | 플럭스 코어드 와이어 | 3 | 55 | 13 | 85.4 | ◎ | 75.9 |
발명예 27 | 149.9 | 85 | 플럭스 코어드 와이어 | 5 | 45 | 8 | 66.5 | ◎ | 72.5 |
발명예 28 | 142.9 | 55 | 플럭스 코어드 와이어 | 7 | 38 | 10 | 53.8 | ◎ | 70.0 |
발명예 29 | 161.7 | 175 | 플럭스 코어드 와이어 | 5 | 48 | 11 | 66.9 | ◎ | 70.7 |
발명예 30 | 228.7 | 65 | 플럭스 코어드 와이어 | 6 | 21 | 9 | 58.2 | ◎ | 69.6 |
발명예 31 | 126.6 | 148 | 플럭스 코어드 와이어 | 10 | 12 | 3 | 40.0 | ○ | 60.7 |
발명예 32 | 196.5 | 161 | 플럭스 코어드 와이어 | 6 | 31 | 7 | 57.7 | ◎ | 70.3 |
발명예 33 | 218.6 | 60 | 플럭스 코어드 와이어 | 8 | 28 | 5 | 47.3 | ◎ | 70.2 |
발명예 34 | 246.6 | 125 | 플럭스 코어드 와이어 | 8 | 15 | 5 | 48.1 | ◎ | 69.5 |
발명예 35 | 125.8 | 34 | 플럭스 코어드 와이어 | 8 | 13 | 15 | 47.4 | ○ | 67.1 |
발명예 36 | 140.5 | 92 | 플럭스 코어드 와이어 | 15 | 35 | 11 | 28.0 | ○ | 57.4 |
발명예 37 | 204.9 | 180 | 플럭스 코어드 와이어 | 5 | 33 | 1 | 64.4 | ○ | 68.8 |
발명예 38 | 129.8 | 45 | 플럭스 코어드 와이어 |
8 | 11 | 4 | 47.6 | ○ | 66.2 |
발명예 39 | 172.2 | 80 | 플럭스 코어드 와이어 |
13 | 35 | 8 | 32.0 | ○ | 60.4 |
발명예 40 | 206.1 | 40 | 플럭스 코어드 와이어 |
7 | 5 | 11 | 55.4 | ○ | 67.5 |
발명예 41 | 148.3 | 25 | 플럭스 코어드 와이어 |
7 | 20 | 3 | 55.3 | ○ | 68.8 |
발명예 42 | 195.7 | 290 | 플럭스 코어드 와이어 |
12 | 38 | 7 | 34.4 | ○ | 56.8 |
발명예 43 | 121.9 | 240 | 플럭스 코어드 와이어 |
12 | 50 | 10 | 34.6 | ○ | 59.2 |
발명예 44 | 225.1 | 155 | 플럭스 코어드 와이어 |
8 | 35 | 1 | 47.6 | ○ | 65.3 |
발명예 45 | 232.4 | 180 | 플럭스 코어드 와이어 |
4 | 20 | 3 | 72.7 | ○ | 69.2 |
발명예 46 | 124.7 | 89 | 피복아크 용접봉 |
4 | 35 | 15 | 80.6 | ◎ | 70.3 |
발명예 47 | 149.9 | 85 | 피복아크 용접봉 |
5 | 50 | 12 | 72.3 | ◎ | 70.2 |
발명예 48 | 142.9 | 55 | 피복아크 용접봉 |
5 | 35 | 10 | 72.6 | ◎ | 69.5 |
발명예 49 | 126.6 | 148 | 피복아크 용접봉 |
3 | 35 | 10 | 92.9 | ◎ | 70.0 |
발명예 50 | 215.2 | 125 | 피복아크 용접봉 |
3 | 38 | 15 | 92.6 | ◎ | 71.1 |
발명예 51 | 166.3 | 60 | 피복아크 용접봉 |
5 | 70 | 12 | 72.3 | ○ | 65 |
발명예 52 | 149.9 | 175 | 피복아크 용접봉 |
5 | 70 | 11 | 72.2 | ○ | 68 |
발명예 53 | 125.8 | 34 | 피복아크 용접봉 |
8 | 13 | 15 | 53.9 | ○ | 67.1 |
발명예 54 | 204.9 | 180 | 피복아크 용접봉 |
5 | 30 | 1 | 71.7 | ○ | 68.5 |
발명예 55 | 129.8 | 45 | 피복아크 용접봉 |
8 | 11 | 4 | 53.5 | ○ | 66.2 |
발명예 56 | 172.2 | 80 | 피복아크 용접봉 |
13 | 35 | 8 | 36.4 | ○ | 60.4 |
발명예 57 | 195.7 | 290 | 피복아크 용접봉 |
12 | 38 | 7 | 39.0 | ○ | 56.8 |
발명예 58 | 121.9 | 240 | 피복아크 용접봉 |
12 | 50 | 10 | 39.3 | ○ | 59.2 |
발명예 59 | 225.1 | 155 | 피복아크 용접봉 |
8 | 35 | 1 | 52.5 | ○ | 65.3 |
비교예4 | 179.4 | 280 | 솔리드 와이어 |
- | - | - | 16.3 | X | 56.8 |
비교예5 | 121.7 | 120 | 솔리드 와이어 |
- | - | - | 15.5 | X | 55.0 |
비교예6 | 150.0 | 230 | 솔리드 와이어 |
- | - | - | 14.4 | X | 56.9 |
비교예7 | 149.9 | 85 | 솔리드 와이어 |
- | - | - | 16.2 | X | 55.3 |
비교예8 | 152.3 | 200 | 솔리드 와이어 |
- | - | - | 16.3 | X | 54.8 |
비교예9 | 130.6 | 183 | 솔리드 와이어 |
- | - | - | 16.9 | X | 56.9 |
비교예10 | 152.3 | 200 | 플럭스 코어드 와이어 |
- | - | - | 13.1 | X | 55.4 |
비교예11 | 225.1 | 120 | 플럭스 코어드 와이어 |
- | - | - | 13.8 | X | 50.8 |
비교예12 | 161.7 | 215 | 플럭스 코어드 와이어 |
- | - | - | 12.6 | X | 52.0 |
비교예13 | 148.3 | 200 | 플럭스 코어드 와이어 |
- | - | - | 12.1 | X | 51.3 |
비교예14 | 126.6 | 183 | 플럭스 코어드 와이어 |
- | - | - | 12.4 | X | 55.4 |
비교예15 | 150.0 | 230 | 플럭스 코어드 와이어 |
- | - | - | 12.7 | X | 53.3 |
비교예16 | 149.9 | 85 | 피복아크 용접봉 |
- | - | - | 10.9 | X | 52.7 |
비교예17 | 166.1 | 180 | 피복아크 용접봉 |
- | - | - | 11.2 | X | 52.3 |
비교예18 | 204.9 | 210 | 피복아크 용접봉 |
- | - | - | 11.1 | X | 53.3 |
비교예19 | 161.7 | 215 | 피복아크 용접봉 |
- | - | - | 11.2 | X | 53.1 |
비교예20 | 121.9 | 181 | 피복아크 용접봉 |
- | - | - | 11.4 | X | 55.5 |
비교예21 | 179.4 | 280 | 피복아크 용접봉 |
- | - | - | 11.2 | X | 55.8 |
Claims (13)
- 제1 강판;제2 강판; 및상기 제1 강판과 제2 강판을 결합하는 용접 이음부;를 포함하고,상기 제1 강판 및 제2 강판 중 적어도 하나가 Zn-Al-Mg계 도금층을 구비한 도금 강판이고,상기 Zn-Al-Mg계 도금층 중 상기 용접 이음부에 최인접한 부분의 미세조직은 면적분율로, Zn-Mg계 금속간 화합물을 20~40% 포함하는, 용접 구조 부재.
- 청구항 1에 있어서,상기 Zn-Al-Mg계 도금층 중 상기 용접 이음부에 최인접한 부분의 미세조직은 면적분율로, Zn 단상을 60% 이상 더 포함하는, 용접 구조 부재.
- 청구항 1에 있어서,상기 용접 이음부의 비드토우부로부터 도금층 사이의 거리가 3~10mm인, 용접 구조 부재.
- 청구항 1에 있어서,상기 Zn-Al-Mg계 도금층 중 상기 용접 이음부에 최인접한 부분의 경도는 용접 전 도금층 경도 대비 69.5% 이상인, 용접 구조 부재.
- 청구항 1에 있어서,상기 Zn-Mg계 금속간 화합물의 평균 직경은 1~30㎛ 범위인, 용접 구조 부재.
- 제1 강판 및 제2 강판을 준비하는 단계;솔리드 와이어, 플럭스 코어드 와이어 및 피복아크 용접봉 중에서 선택된 어느 하나의 용접재료를 이용하여, 상기 제1 강판 및 제2 강판을 아크 용접함으로써 용접 이음부를 형성하는 단계; 및상기 용접 이음부의 표면 온도를 기준으로, 25~110℃/s의 평균 냉각 속도가 되도록 수냉하는 단계;를 포함하고,상기 제1 강판 및 제2 강판 중 적어도 하나는 Zn-Al-Mg계 도금층을 구비한 도금강판인, 용접 구조 부재의 제조방법.
- 청구항 6에 있어서,상기 용접 재료는 솔리드 와이어이고,상기 용접 이음부는 중량%로, C: 0.09~0.15%, Si: 0.35~0.39%, Mn: 0.87~0.90%, P: 0.004~0.022%, S: 0.002~0.014%, Cr: 0.01~0.11%, Ni: 0.01~0.08%, Cu: 0.01~0.06%, Mo: 0.01% 이하(0% 포함), Al: 0.01 ~ 0.02%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는, 용접 구조 부재의 제조방법.
- 청구항 6에 있어서,상기 용접 재료는 플럭스 코어드 와이어이고,상기 용접 이음부는 중량%로, C: 0.05~0.10%, Si: 0.47~0.53%, Mn: 1.10~1.16%, P: 0.009~0.025%, S: 0.007~0.018%, Cr: 0.03~0.13%, Ni: 0.02~0.11%, Cu: 0.02~0.08%, Mo: 0.02~0.07%, Al: 0.005~0.02%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는, 용접 구조 부재의 제조방법.
- 청구항 6에 있어서,상기 용접 재료는 피복아크 용접봉이고,상기 용접 이음부는 중량%로, C: 0.06~0.14%, Si: 0.42~0.49%, Mn: 0.83~0.91%, P: 0.015~0.035%, S: 0.010~0.022%, Cr: 0.07~0.20%, Ni: 0.06~0.15%, Cu: 0.05~0.12%, Mo: 0.05~0.10%, Al: 0.01~0.02%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는, 용접 구조 부재의 제조방법.
- 청구항 6에 있어서,상기 수냉하는 단계는 용접 토치 통과 후, 3~10초 이내에 냉각을 개시하는, 용접 구조 부재의 제조방법.
- 청구항 6에 있어서,상기 수냉하는 단계는 15~60mm3/hr의 유량으로 수행되는, 용접 구조 부재의 제조방법.
- 청구항 6에 있어서,상기 수냉하는 단계는 용접 이음부에서 수냉이 시작된 시점으로부터 5~15초간 수냉이 지속되도록 수행되는, 용접 구조 부재의 제조방법.
- 청구항 6에 있어서,상기 용접 이음부를 형성하는 단계는 3~8kJ/cm의 입열량으로 수행되는, 용접 구조 부재의 제조방법.
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EP4265361A1 (en) | 2023-10-25 |
CN116669896A (zh) | 2023-08-29 |
KR102402239B1 (ko) | 2022-05-26 |
US20240042541A1 (en) | 2024-02-08 |
JP2024502759A (ja) | 2024-01-23 |
EP4265361A4 (en) | 2024-06-05 |
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