WO2021210335A1 - アーク溶接継手およびアーク溶接方法 - Google Patents

アーク溶接継手およびアーク溶接方法 Download PDF

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Publication number
WO2021210335A1
WO2021210335A1 PCT/JP2021/010961 JP2021010961W WO2021210335A1 WO 2021210335 A1 WO2021210335 A1 WO 2021210335A1 JP 2021010961 W JP2021010961 W JP 2021010961W WO 2021210335 A1 WO2021210335 A1 WO 2021210335A1
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Prior art keywords
bead
welding
arc
slag
ratio
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PCT/JP2021/010961
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English (en)
French (fr)
Japanese (ja)
Inventor
恭平 小西
央海 澤西
松田　広志
善明 村上
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JFE Steel Corp
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JFE Steel Corp
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Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to US17/917,772 priority Critical patent/US20230132518A1/en
Priority to JP2021532233A priority patent/JP7238990B2/ja
Priority to MX2022012761A priority patent/MX2022012761A/es
Priority to EP21788603.5A priority patent/EP4137260A4/en
Priority to CN202180027750.6A priority patent/CN115427179B/zh
Priority to KR1020227034959A priority patent/KR102735015B1/ko
Publication of WO2021210335A1 publication Critical patent/WO2021210335A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • 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
    • B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
    • B23K9/073—Stabilising the arc
    • 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
    • B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
    • 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
    • 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
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys

Definitions

  • the present invention relates to an arc welded joint having excellent corrosion resistance suitable for undercarriage members of automobiles and the like, and an arc welded method for obtaining the arc welded joint.
  • rust prevention treatment such as chemical conversion treatment and electrodeposition coating after welding for the purpose of ensuring corrosion resistance.
  • rust and corrosion may be confirmed in and around the weld.
  • the corrosion that occurs in the electrodeposited member is likely to occur from the welded part, and with the passage of time, it expands in a wide range of the welded part and its surroundings with swelling of the coating film, and in the plate thickness direction. Also progresses.
  • the corrosion progresses in this way, the plate thickness of the welded portion and its vicinity is reduced, and as a result, the strength of the welded portion is lowered, and eventually the strength of the member is lowered. That is, if corrosion occurs and progresses in a member (for example, an undercarriage member of an automobile) on which a load acts on a welded portion, the member may be destroyed.
  • a chemical conversion treatment for example, zinc phosphate
  • a chemical conversion treatment for example, zinc phosphate
  • electrodeposition coating is performed.
  • Zinc phosphate treatment which is widely used as an example of chemical conversion treatment, is a technique for growing zinc phosphate crystals on the surfaces of a base steel sheet and a weld metal to improve the adhesion of a coating film in electrodeposition coating.
  • arc welding is used as a joining method as in the past. Therefore, the plating layer evaporates in the welded portion exposed to high heat by the arc plasma (hereinafter referred to as arc) which is a heat source, and the non-plated portion is locally exposed. Therefore, a significant improvement in corrosion resistance that is commensurate with the cost increase associated with the use of a steel sheet having a plating layer cannot be expected.
  • Patent Document 1 after arc welding, a non-oxidizing acidic solution having a pH of 2 or less and a liquid temperature of 30 to 90 ° C. is sprayed on the welded portion and its vicinity before electrodeposition coating is applied.
  • a technique for performing a treatment or a dipping treatment is disclosed. This technique removes the slag of (a), the welding fume of (b), and the oxide of (c) described above by dissolving the weld bead or the steel plate with a non-oxidizing solution.
  • Patent Document 1 it is necessary to wash away the acidic solution before electrodeposition coating, which complicates the manufacturing process of the member. Further, since the member formed into a desired shape is formed by superimposing and joining steel plates of various shapes, the acidic solution remaining in the superposed gap causes severe corrosion. Furthermore, since a large amount of acidic solution is used, it is necessary to prevent the scattering of fume and ensure the safety of workers, in addition to the fact that the manufacturing equipment is exposed to a corrosive environment and easily corrodes or breaks down.
  • Patent Document 2 discloses a technique for reducing an oxidizing gas (that is, CO 2 , O 2 ) contained in a gas for shielding a welded portion (hereinafter, referred to as a shield gas) in arc welding. This technique suppresses the formation of slag during welding, suppresses the oxidation of the heat-affected zone of the weld, and also suppresses the adhesion of the weld fume.
  • an oxidizing gas that is, CO 2 , O 2
  • Patent Document 3 describes a technique for suppressing the formation of slag by reducing the total content of Si and Mn of a welding wire used in arc welding and the Si and Mn contents of a steel sheet used. It is disclosed.
  • Patent Document 4 discloses a technique for sufficiently forming a chemical conversion treatment layer by adjusting the components of a treatment liquid used in a chemical conversion treatment even for a weld bead in which slag, a welding fume, and an oxide are present. Has been done. This technique facilitates the formation of a chemical conversion treatment layer by performing surface treatment with a surface conditioner containing a zinc phosphate colloid. Further, by performing a chemical conversion treatment using a zinc phosphate treatment liquid having an F content of 100 mass ppm or more, slag, welding fume, and oxides are dissolved and removed, and the adhesion of the coating film by electrodeposition coating is achieved. Is to enhance.
  • Patent Document 4 a zinc phosphate treatment liquid containing fluorine, which is designated as a poison, is used. Therefore, when the waste liquid is discharged to the outside of the factory, fluorine is used to a level that satisfies the environmental standard. Must be reduced. Therefore, a large-scale waste liquid treatment facility is required in addition to the component manufacturing facility.
  • the present invention solves the problems of the prior art, and is an arc welded joint having excellent corrosion resistance suitable for various steel members (for example, undercarriage members of automobiles) used by subjecting electrodeposition coating. , And an arc welding method for obtaining it.
  • steel coated member the cause of deterioration of corrosion resistance in the welded portion of the electrodeposited steel member (hereinafter referred to as steel coated member).
  • Deterioration of corrosion resistance of welds of steel coated members is caused by slag and weld fume adhering to welds (ie, weld beads and weld heat affected zones), and oxides formed on the surface of steel plates exposed to high temperatures by arc welding. It is due to.
  • zinc phosphate treatment is performed as a chemical conversion treatment before electrodeposition coating is applied to a member manufactured by processing a steel sheet, the steel sheet is melted by the etching action of the zinc phosphate treatment liquid.
  • the present inventors have studied a technique capable of improving corrosion resistance by precipitating zinc phosphate crystals on welds without gaps. Then, in order to improve the corrosion resistance of the welded portion, it was found that it is most effective to reduce the slag adhering to the welded portion.
  • the content of Si, Mn, Ti, etc. increases due to the high alloying of the components, so that there arises a problem that the amount of slag generated in the welded portion increases.
  • This problem can be solved by suppressing the oxidation of Si, Mn, Ti and the like contained in the steel sheet and the welding wire. That is, if a shield gas having a reduced content of oxidizing gas is used, the oxidation of these elements can be suppressed and the amount of slag produced can be reduced. However, if the oxidizing gas in the shield gas is reduced, the cathode point moves around violently during arc welding, and the arc becomes unstable. As a result, new problems such as oxygen mixing in the molten pool due to the entrainment of the atmosphere or deterioration of the shape of the weld bead occur. On the other hand, in order to increase the strength of the steel coated member, it is inevitable that the contents of Si, Mn, Ti and the like will increase.
  • the present invention has been made based on such findings. That is, the present invention, the area of the surface of the weld bead formed by welding the steel plates in arc welding and the bead surface area S BEAD (mm 2), the area of which is covered with slag of the bead surface area S BEAD Assuming that the area is the slag surface area S SLAG (mm 2 ), the slag coverage area ratio S RATIO (%) calculated by Eq. (1) is 15% or less, and the bead width in the direction perpendicular to the weld line of the weld bead. This is an arc welded joint in which the bead width ratio W RATIO (%) calculated by Eq. (2) using the maximum value W MAX (mm) and the minimum value W MIN (mm) is 60% or more.
  • a cleaning region in which oxides on the surface of the steel sheet are removed by forming a cathode point during arc welding is formed adjacent to the toe of the weld bead, and from the outer edge of the cleaning region.
  • the minimum value M MIN (mm) of the distance (hereinafter referred to as "cleaning width") M (mm) in the direction perpendicular to the welding line to the toe of the welding bead is preferably 0.5 mm or more. ..
  • the slag covering area ratio S RATIO (%) calculated by Eq. (1) using a certain slag surface area S SLAG (mm 2 ) is 15% or less, and the bead width in the direction perpendicular to the weld line of the weld bead.
  • An arc welding method for manufacturing an arc welded joint in which the bead width ratio W RATIO (%) calculated by Eq. (2) using the maximum value W MAX (mm) and the minimum value W MIN (mm) is 60% or more. be.
  • arc welding is performed with the same reverse polarity as general CO 2 welding and MAG welding, and oxides on the surface of the steel plate are removed by forming a cathode point which is a starting point of electron emission. It is preferable that the cleaning region is formed adjacent to the toe of the weld bead and the minimum value M MIN (mm) of the cleaning width M (mm) is 0.5 mm or more. Further, it is preferable to use Ar gas as the shield gas.
  • the average short-circuit frequency F AVE (Hz) is 20 ⁇ 300 Hz of the short circuit, and the maximum short-circuit period T CYC short-circuit (s) is less than 1.5s Is preferable.
  • pulse current is used as the welding current in arc welding, and the peak current I PEAK (A), base current I BASE (A), peak period t PEAK (ms), rise period t UP (ms), and standing of the pulse current are used.
  • X (A ⁇ s / m) calculated by the formula (3) using the falling period t DOWN (ms) and the distance L (mm) between the steel plate and the contact tip satisfies 50 ⁇ X ⁇ 250. Is preferable.
  • a solid wire may be used as the welding wire.
  • S RATIO 100 ⁇ S SLAG / S BEAD ⁇ ⁇ ⁇ (1)
  • W RATIO 100 x W MIN / W MAX ...
  • X (I PEAK x t PEAK / L) + (I PEAK + I BASE ) x (t UP + t DOWN ) / (2 x L) ...
  • the cathode point which is the starting point of electron emission, is formed on the steel sheet by performing arc welding with the steel sheet as the negative pole and the welding wire as the positive pole (so-called reverse polarity), which is caused by the electron emission.
  • This is the region where the phenomenon of removing oxides on the surface of the steel sheet (so-called cleaning) occurs.
  • "s" in the unit of X (A ⁇ s / m) is the second (second)
  • various members are manufactured using high-strength steel sheets having a tensile strength of 440 MPa or more (for example, 440 MPa class, 590 MPa class, 980 MPa class steel sheets), and the corrosion resistance thereof is improved. Because it can be done, it has a remarkable effect on the industry. Further, by using a high-strength steel plate, it is possible to reduce the thickness of the member.
  • FIG. 1 is a perspective view schematically showing an example in which the present invention is applied to overlap fillet welding.
  • FIG. 2 is a perspective view schematically showing an example of a weld bead formed by the overlap fillet welding of FIG. 3A and 3B are enlarged cross-sectional views showing the welding wire in FIG. 1 and its vicinity, and are schematic views showing a state of short-circuit transition.
  • FIG. 4 is a graph showing a pulse current waveform supplied as a welding current.
  • FIG. 5 is a perspective view schematically showing a toe portion and a start / end portion in the weld bead formed by the overlap fillet welding of FIG.
  • FIGS. 1 to 5 show a diagram in which two steel plates are welded as an example.
  • two steel plates (base material) 3 are formed by stacking two steel plates 3 from the welding torch 2 through the center of the welding torch 2.
  • a welding voltage is applied from a welding power source (not shown) using the welding wire 1 and the steel plate 3 continuously supplied to the welding line formed by the corner of the step as electrodes.
  • a part of the shield gas (not shown) supplied from the inside of the welding torch 2 is ionized and turned into plasma, so that an arc 5 is formed between the welding wire 1 and the steel plate 3.
  • the portion of the shield gas that flows from the welding torch 2 to the steel plate 3 without ionization has a role of blocking the molten pool (not shown in FIG.
  • a welding wire 1 or a steel plate 3 to which a non-ferrous element such as Si, Mn, or Ti is added as a deoxidizer is used. That is, the reaction between oxygen and iron is suppressed by discharging the oxygen generated by the reaction of the formula (4) or the formula (5) as a slag composed of SiO 2 , MnO, TiO 2, and the like.
  • the toe portion 9 and the start / end portion 10 of the weld bead will be described with reference to FIG.
  • the "bead start / end portion" is a region of the bead start end portion and the bead end portion.
  • the "bead start end” refers to a region within 15 mm from the bead start end (welding start position) on the welding line toward the bead end (welding end position), and the “bead end portion” refers to the bead on the welding line from the bead end. Refers to the area within 15 mm in the starting end direction.
  • the "toe portion of the bead” refers to the boundary between the weld metal and the unmelted base steel plate in the direction perpendicular to the welding line of the weld bead.
  • the amount of O 2 and CO 2 mixed is reduced by using a shield gas containing Ar gas as a main component, and as a result, the formation of slag is suppressed.
  • the surface area of the weld bead 6 is defined as the bead surface area S BEAD (mm 2 ), and the area of the slag-covered region of the bead surface area S BEAD is defined as the slag surface area S SLAG (mm 2 ).
  • the slag covering area ratio S RATIO (%) calculated by the equation (1) is set to 15% or less.
  • the slag coverage area ratio S RATIO is preferably 9% or less, and more preferably 5% or less.
  • the slag coverage area ratio S RATIO is preferably 0.1% or more.
  • S RATIO 100 ⁇ S SLAG / S BEAD ⁇ ⁇ ⁇ (1) In order to prevent the slag from being unevenly distributed on the weld bead 6, it is necessary to stabilize the shape of the weld bead 6.
  • the maximum value W MAX (mm) and the minimum value W MIN (mm) of the bead width (see FIG. 2) in the direction perpendicular to the line parallel to the welding direction of the welding bead 6 (hereinafter referred to as the welding line).
  • W RATIO the bead width ratio
  • the weld bead 6 having a uniform surface texture, it is possible to obtain a uniform chemical conversion treatment layer by chemical conversion treatment and a uniform coating film by electrodeposition coating. Further, since the difference between W MAX and W MIN is reduced, local accumulation of the treatment liquid in the W MIN portion in the chemical conversion treatment and electrodeposition coating is suppressed, so that the bead width ratio W RATIO is preferable. Is 70% or more, more preferably 80% or more.
  • the upper limit of the bead width ratio W RATIO is not particularly specified. It is preferably 100% or less.
  • W RATIO 100 x W MIN / W MAX ...
  • the arc welding is performed by using the welding wire 1 as an anode and the steel plate 3 as a cathode (so-called reverse polarity).
  • a cathode point that serves as a starting point for electron emission is formed on the steel sheet 3, and an oxide on the surface of the steel sheet 3 (for example, a black skin generated in the manufacturing process of the steel sheet 3 and heat input during welding) is generated.
  • a region 4 (so-called cleaning region) from which the oxides and the like have been removed appears.
  • the minimum value M MIN (mm) of the cleaning width M (mm) is preferably 0.5 mm or more. More preferably, it is 2.0 mm or more. More preferably, it is 4.0 mm or more.
  • the maximum value M MAX (mm) of the cleaning width M (mm) is preferably 8.0 mm or less.
  • the welding wire 1 becomes the anode and the steel plate 3 becomes the cathode. Then, a welding voltage is applied from the welding wire 1 continuously supplied to the steel plate 3 through the center of the welding torch 2, and a part of the shield gas supplied from the inside of the welding torch 2 is ionized into plasma. .. As a result, the arc 5 is formed between the welding wire 1 and the steel plate 3.
  • the balance of the shield gas (that is, the gas flowing from the welding torch 2 to the steel plate 3 without ionization) shuts off the arc 5, the molten metal 7, and the molten pool 8 from the outside air (see FIG. 3). This has a role of preventing oxygen contamination (that is, slag formation) and nitrogen contamination (that is, blowhole formation).
  • the tip of the welding wire 1 is melted by the heat of the arc 5 to become molten metal 7, and the droplets are transported to the molten pool 8 by electromagnetic force or gravity.
  • a state in which the molten metal 7 is separated from the molten pool 8 see FIG. 3A
  • a state in which the molten metal 7 is in contact with the molten pool 8 and electrically short-circuited see FIG. 3B.
  • the composition of the Ar gas means that Ar has a volume fraction of 99.0% or more.
  • the shield gas composed of the above Ar gas is also referred to as Ar shield gas.
  • the present invention limits the short-circuit period (hereinafter referred to as short-circuit cycle) and the short-circuit frequency (hereinafter referred to as short-circuit frequency) between the welding wire 1 and the steel plate 3 in arc welding. Specifically, it is preferable that the maximum value T CYC the short period (s) is not more than 1.5s, and averaging values of the short-circuit frequency (average short frequency) F AVE (Hz) and 20 ⁇ 300 Hz.
  • the molten pool 8 becomes unstable. Specifically, when the average short-circuit frequency FAVE is less than 20 Hz, large droplets move to the molten pool 8 or droplet transition forms other than short-circuit transition (for example, streaming transition) are irregularly mixed. Will be done. When the average short-circuit frequency F AVE exceeds 300 Hz, the droplets are small, but the re-ignition of the arc due to the short circuit becomes excessive. For this reason, in either case, the molten pool 8 is disturbed, and it is difficult to eliminate the meandering and waviness of the weld bead.
  • the average short circuit frequency FAVE to 20 to 300 Hz, it is possible to make the volume of droplets transported to the molten pool 8 by one short circuit about the same as that of a sphere having the same diameter as the welding wire 1. It becomes. As a result, the movement of droplets can be stabilized.
  • the average short-circuit frequency F AVE is more preferably 35 Hz or higher, and even more preferably 50 Hz or higher, in order to eliminate unevenness in the volume of droplets transported to the molten pool 8 by one short circuit and improve the uniformity of the weld bead. .. Further, when the average short-circuit frequency FAVE is large, droplets having a small volume may be scattered as a large amount of spatter at the time of short-circuiting and re-ignition. Therefore, 250 Hz or less is more preferable, and 200 Hz or less is even more preferable.
  • Maximum short-circuit period T CYC refers to the maximum value in the short-circuit period of the welding path performed to obtain an arc welded joint. That is, it means that the short-circuit period of each of the welding paths does not exceed 1.5 s.
  • the maximum short-circuit period T CYC is less being more preferred 1.0 s. More preferably, it is 0.2 s or less.
  • the maximum short-circuit period T CYC may be within a range of average short circuit frequency F AVE is 300Hz or less, is preferably at least 0.004S.
  • the preferable range of welding conditions is, for example, welding current: 150 to 300 A, arc voltage: 20 to 35 V, Ar gas flow rate: 15 to 25 Lite / min, distance L between the steel plate 3 and the contact tip (hereinafter referred to as CTWD). ): 5 to 30 mm can be mentioned.
  • the welding current and arc voltage are average values in the welding path.
  • the method for setting the average short circuit frequency and the maximum short circuit period in the above ranges is not particularly limited.
  • the current waveform control by the pulse current as shown in FIG. 4 is applied, the peak current is I PEAK (A), the base current is I BASE (A), the peak period is t PEAK (ms), and the rise period is t UP.
  • the fall period is t DOWN (ms)
  • CTWD is L (mm)
  • the value of X (A ⁇ s / m) calculated by the following formula (3) is 50 ⁇ X ⁇ 250.
  • X (I PEAK x t PEAK / L) + (I PEAK + I BASE ) x (t UP + t DOWN ) / (2 x L) ... (3) If the value of X (A ⁇ s / m) calculated by the equation (3) is too small, the arc 5 may fluctuate or the droplet transfer may become unstable. On the other hand, if the value of X is too large, the welding wire 1 may plunge into the molten pool 8 or the grown droplets may scatter at the time of a short circuit, resulting in deterioration of the bead shape or spatter adhesion. Therefore, the value of X preferably satisfies 50 ⁇ X ⁇ 250.
  • the value of X is more preferably 80 or more, and even more preferably 200 or less.
  • the value of L between the steel plate 3 and the contact tip is preferably 5 to 30 mm. More preferably, it is 8 to 20 mm.
  • I PEAK is more preferably 400 A or more, and more preferably 500 A or less.
  • I BASE is preferably 30 to 120 A because if it is too small, the arc becomes unstable, and if it is too large, it causes meltdown. I BASE is more preferably 40 A or more, and more preferably 100 A or less.
  • t PEAK is preferably 0.1 to 5.0 ms because if it is too small, sufficient heat input cannot be secured, and if it is too large, it causes melt-through.
  • t PEAK is more preferably 1.0 ms or more, and more preferably 4.5 ms or less.
  • each of t UP and t DOWN is preferably 0.1 to 3.0 ms.
  • t UP and t DOWN are each more preferably 0.5 ms or more, and more preferably 2.5 ms or less.
  • t BASE is preferably 0.1 to 10.0 ms. It is more preferably 1.0 ms or more, and more preferably 8.0 ms or less.
  • the pulse frequency of the pulse current is not particularly limited as long as one short circuit can be generated by one to several pulses.
  • the aim of introducing the pulse current is (1) to promote stable growth of droplets while suppressing the fluctuation of the arc by reducing the current in the base period, and (2) the fall period from the peak period.
  • the grown droplets are pushed down into the molten pool to promote a short circuit.
  • the present invention does not require the supply of oxygen or the addition of special elements. Therefore, by using a solid wire as the welding wire, which is cheaper than the flux-cored wire, the cost of the process can be reduced.
  • the solid wire that can be suitably used in the present invention is C: 0.020 to 0.250% by mass, Si: 0.05 to 1.50% by mass, Mn: 0.50 to 3.0% by mass. , P: 0.020% by mass or less, S: 0.03% by mass or less, and has a wire composition in which the balance is Fe and unavoidable impurities.
  • the diameter of the solid wire is preferably 0.4 mm to 2.0 mm.
  • Laminated fillet welding (see FIG. 1) was performed using two steel plates having the components shown in Table 1 (both having a plate thickness of 2.6 mm) to prepare an arc welded joint.
  • the welding conditions were as shown in Table 2.
  • the components of the welded wires (both 1.2 mm in diameter) shown as wire symbols in Table 2 were as shown in Table 4.
  • the components other than those shown in Tables 1 and 4 were unavoidable impurities.
  • the produced arc welded joint was subjected to alkaline degreasing, surface adjustment, and zinc phosphate-based chemical conversion treatment, and cationic electrodeposition coating was performed under the condition that the thickness of the base metal flat plate portion other than the welded portion was 15 ⁇ m. After that, the corrosion test of SAE J2334 was carried out up to 60 cycles.
  • the bead surface area S BEAD and the slag surface area S SLAG are obtained by photographing the surface of the region of the weld bead 6 excluding the bead start and end portions 10 (each having a length of 15 mm) from directly above, and the projected area from the upper surface of the weld bead and the slag. was measured and calculated.
  • the length of the weld bead 6 was less than 130 mm, the surface of the entire length excluding the bead start / end portion 10 was photographed.
  • the length of the weld bead 6 was 130 mm or more, the surface of an arbitrary portion (length 100 mm) except for the bead start / end portion 10 was photographed.
  • the slag coverage area ratio S RATIO was determined.
  • the obtained slag coverage area ratio S RATIO is shown in Table 3.
  • the surface of the region excluding the bead start / end portion 10 (each having a length of 15 mm) of the weld bead 6 is photographed, and the obtained photographs are analyzed. It was measured.
  • the length of the weld bead 6 was less than 130 mm, the surface of the entire length excluding the bead start / end portion 10 was photographed.
  • the length of the weld bead 6 was 130 mm or more, the surface of an arbitrary portion (length 100 mm) except for the bead start / end portion 10 was photographed.
  • the bead width ratio W RATIO was obtained by using each of the measured maximum value W MAX and minimum value W MIN of the bead width and the above equation (2).
  • the obtained bead width ratio W RATIO is shown in Table 3.
  • the surface of the region excluding the bead start / end portion 10 (each having a length of 15 mm) of the weld bead 6 is photographed, and the obtained photographs are analyzed. It was measured.
  • the length of the weld bead 6 was less than 130 mm, the surface of the entire length excluding the bead start / end portion 10 was photographed.
  • the length of the weld bead 6 was 130 mm or more, the surface of an arbitrary portion (length 100 mm) except for the bead start / end portion 10 was photographed.
  • Table 3 shows the maximum value M MAX and the minimum value M MIN of the measured cleaning width.
  • the evaluation of "corrosion resistance” shown in Table 3 was performed as follows. First, the arc welded joint after the corrosion test was immersed in a release agent for immersion to remove the electrodeposition coating, and then corrosion products were removed in accordance with ISO8407. Next, when the bead start / end portion 10 (each having a length of 15 mm) of the weld bead 6 is included, the surface of the region excluding the bead start / end portion 10 is photographed, and the obtained photograph is analyzed to analyze the bead toe end portion 9. The maximum corrosion width HMAX from was measured. The evaluation of corrosion resistance was carried out according to the following criteria, and symbols A to C and F were assigned, respectively.
  • symbol A shown in Table 3 is a case where "the maximum corrosion width H MAX from a bead toe is less than 3.0 mm".
  • symbol B is the case of "maximum corrosion width H MAX is less than 4.5mm or 3.0mm from the bead toe portion.”
  • symbol C is a case where “the maximum corrosion width H MAX from the bead toe is 4.5 mm or more and less than 6.0 mm”.
  • symbol F is a case where “the maximum corrosion width H MAX from the toe of the bead is 6.0 mm or more”.
  • the symbol A is the best, followed by B and C in that order, and the symbol F is inferior.
  • the "bead start / end portion” is a region within 15 mm from the bead start end (welding start position) on the welding line in the bead end (welding end position) direction, and from the bead end to the welding line. Refers to the area within 15 mm in the bead start end direction.
  • the “bead toe” refers to the boundary between the weld metal and the unmelted base steel plate in the direction perpendicular to the weld line of the weld bead. The evaluation results are shown in Table 3.
  • welding Nos. 5 to 15 shown as examples of the present invention have S RATIO of 15% or less and W RATIO of 60% or more, and therefore have excellent corrosion resistance. A fitting was obtained.
  • welding Nos. 1 and 2 which are comparative examples, have S RATIO exceeding 15%, and welding Nos. 3 and 4 have W RATIO less than 60%, so that chemical conversion processability and electrodeposition coating property are improved. It deteriorated, and as a result, the corrosion resistance of the arc welded joint also deteriorated.
  • the welding wire for ultra-high ten (wire symbol W1 in Table 4) and the welding wire for mild steel (wire symbol W2 in Table 4) It was confirmed that an arc welded joint having excellent corrosion resistance could be obtained by using either of them.

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  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Arc Welding In General (AREA)
  • Arc Welding Control (AREA)
  • Nonmetallic Welding Materials (AREA)
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EP21788603.5A EP4137260A4 (en) 2020-04-15 2021-03-18 ARC WELDING JOINT AND ARC WELDING PROCESS
CN202180027750.6A CN115427179B (zh) 2020-04-15 2021-03-18 电弧焊接接头及电弧焊接方法
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JP2023166120A (ja) * 2022-05-09 2023-11-21 日本製鉄株式会社 アーク溶接継手、自動車部品、及びアーク溶接継手の製造方法
JP7435931B1 (ja) * 2022-10-31 2024-02-21 Ｊｆｅスチール株式会社 ガスシールドアーク溶接方法および溶接継手の製造方法
WO2024095612A1 (ja) * 2022-10-31 2024-05-10 Ｊｆｅスチール株式会社 ガスシールドアーク溶接方法および溶接継手の製造方法
JP7508016B1 (ja) * 2023-04-25 2024-07-01 Ｊｆｅスチール株式会社 アーク溶接継手およびその製造方法
JPWO2024224712A1 (https=) * 2023-04-25 2024-10-31
WO2024224713A1 (ja) * 2023-04-25 2024-10-31 Ｊｆｅスチール株式会社 アーク溶接継手およびその製造方法
EP4541497A4 (en) * 2022-06-17 2025-10-01 Nippon Steel Corp METHOD FOR MANUFACTURING AN ARC-WELDED JOINT, ARC-WELDED JOINT, AND AUTOMOTIVE COMPONENT
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JP2023166120A (ja) * 2022-05-09 2023-11-21 日本製鉄株式会社 アーク溶接継手、自動車部品、及びアーク溶接継手の製造方法
EP4541497A4 (en) * 2022-06-17 2025-10-01 Nippon Steel Corp METHOD FOR MANUFACTURING AN ARC-WELDED JOINT, ARC-WELDED JOINT, AND AUTOMOTIVE COMPONENT
JP7435931B1 (ja) * 2022-10-31 2024-02-21 Ｊｆｅスチール株式会社 ガスシールドアーク溶接方法および溶接継手の製造方法
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EP4570410A4 (en) * 2022-10-31 2025-11-26 Jfe Steel Corp ARC WELDING METHOD FOR COVERING MESH, AND PRODUCTION METHOD FOR WELDING JOINT
JP7508016B1 (ja) * 2023-04-25 2024-07-01 Ｊｆｅスチール株式会社 アーク溶接継手およびその製造方法
JPWO2024224712A1 (https=) * 2023-04-25 2024-10-31
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WO2024224713A1 (ja) * 2023-04-25 2024-10-31 Ｊｆｅスチール株式会社 アーク溶接継手およびその製造方法
JP7677536B2 (ja) 2023-04-25 2025-05-15 Ｊｆｅスチール株式会社 アーク溶接継手およびその製造方法

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