WO2024224712A1 - アーク溶接継手およびその製造方法 - Google Patents

アーク溶接継手およびその製造方法 Download PDF

Info

Publication number
WO2024224712A1
WO2024224712A1 PCT/JP2024/001190 JP2024001190W WO2024224712A1 WO 2024224712 A1 WO2024224712 A1 WO 2024224712A1 JP 2024001190 W JP2024001190 W JP 2024001190W WO 2024224712 A1 WO2024224712 A1 WO 2024224712A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
welding
bead
pulse
weld
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2024/001190
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
恭平 小西
央海 澤西
公一 谷口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP2024515388A priority Critical patent/JP7677536B2/ja
Priority to KR1020257034586A priority patent/KR20250168363A/ko
Priority to CN202480025912.6A priority patent/CN121001844A/zh
Priority to EP24796471.1A priority patent/EP4681852A1/en
Publication of WO2024224712A1 publication Critical patent/WO2024224712A1/ja
Priority to MX2025012410A priority patent/MX2025012410A/es
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/06—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
    • 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 that has a small amount of slag adhesion, a stable penetration depth, and excellent weld joint strength and corrosion resistance of the weld, and a method for manufacturing the same.
  • components used in corrosive environments are subjected to anti-rust treatments such as chemical conversion coating and electrocoating after welding to ensure corrosion resistance.
  • anti-rust treatments such as chemical conversion coating and electrocoating after welding to ensure corrosion resistance.
  • rust and corrosion may be observed at the weld and its vicinity.
  • corrosion that occurs in components that have been electrocoated tends to start at the weld, and over time it spreads over a wide area at the weld and its surroundings, accompanied by blistering of the paint film, and also progresses in the thickness direction.
  • the plate thickness at the weld and its vicinity decreases, resulting in a decrease in the strength of the weld and ultimately the strength of the component.
  • a load acts on the weld (such as an automobile's suspension components)
  • a chemical conversion treatment (such as zinc phosphate treatment) is applied to the base steel sheet and weld metal as a pretreatment to improve adhesion between the electrodeposition coating and the base steel sheet and weld metal, and then electrodeposition painting is performed.
  • Zinc phosphate treatment a widely used example of a chemical conversion treatment, is a technique in which zinc phosphate crystals are grown on the surface of the base steel sheet and weld metal to improve the adhesion of the coating during electrodeposition painting.
  • paint blistering frequently occurs over a wide area at and around the weld over time.
  • the starting point of corrosion from the weld is (a) Slag adhering to the weld (mainly the surface of the weld bead), (b) Welding fumes adhering to the welded part; (c) Oxides formed on the surface of steel plates exposed to high temperatures by welding; has been known for some time. Even if a member having the above-mentioned deposits (a) and (b) or oxides (c) present in the welded portion is subjected to chemical conversion treatment, these deposits and products will cause localized areas that are not covered with a chemical conversion treatment layer made of zinc phosphate crystals to remain, starting from these deposits and products.
  • Patent Document 1 discloses a technique in which after arc welding and before electrocoating, the weld and its vicinity are sprayed or immersed in a non-oxidizing acidic solution with a pH of 2 or less and a liquid temperature of 30 to 90°C. This technique removes the above-mentioned (a) slag, (b) welding fumes, and (c) oxides by dissolving the weld beads and base steel plate in a non-oxidizing solution.
  • Patent Document 2 discloses a technology that reduces the total Si content of the welding wire and base material used in arc welding, and increases the total Mn content of the welding wire and base material, thereby improving the corrosion resistance of the weld and its vicinity after painting.
  • Patent Document 3 discloses a technology for forming a sufficient chemical conversion layer by adjusting the components of the treatment liquid used in the chemical conversion treatment, even in weld beads that contain slag, welding fumes, and oxides. Specifically, the formation of the chemical conversion layer is facilitated by performing surface treatment using a surface adjustment liquid containing zinc phosphate colloid. Furthermore, by performing chemical conversion treatment using a zinc phosphate treatment liquid with an F content of 100 mass ppm or more, slag, welding fumes, and oxides are dissolved and removed, improving the adhesion of the coating film formed by electrocoating.
  • Patent Document 3 uses a zinc phosphate treatment solution that contains fluorine, which is designated as a toxic substance, so when the waste liquid is discharged outside the factory, the fluorine content must be reduced to a level that meets environmental standards. Therefore, in addition to the parts manufacturing equipment, large-scale waste liquid treatment equipment is required.
  • the present invention was made in consideration of these problems, and aims to provide an arc welded joint that has a small amount of slag adhesion, a stable penetration depth, and excellent weld joint strength and corrosion resistance of the weld, as well as a method for manufacturing the same.
  • the inventors have discovered that the most effective way to improve the corrosion resistance of the weld and stably obtain welded joints with a stable penetration depth is to reduce the amount of slag that adheres to the weld and to achieve periodic short-circuit transfer using pulse welding.
  • the penetration depth becomes unstable. Therefore, the inventors have discovered a technology that uses pulse welding to reduce the crawling of the cathode spot and realizes periodic short-circuit transfer that is not easily affected by the wobbling of the arc, and by using a pulse current waveform, a welded joint with less slag adhesion, stable penetration, and excellent welded joint strength and corrosion resistance can be obtained.
  • the present invention is based on the above findings, and the gist of the present invention is as follows.
  • the arc welded joint has an upper plate, a lower plate, and a weld portion that joins the upper plate and the lower plate and penetrates into the upper plate and the lower plate,
  • the thickness t1 of the upper plate and the thickness t2 of the lower plate are each 5.0 mm or less
  • the plate thickness t2 of the lower plate and the penetration depth d which is the distance from the boundary between the upper plate and the lower plate in the cross section of the weld to the lower surface of the weld bead, satisfy the following formula (1): and a slag coverage area ratio S RATIO calculated by the following formula (2) using a bead surface area S BEAD of the weld bead surface and a slag surface area S SLAG , which is the area of a region covered with slag
  • t 2 (mm) represents the plate thickness of the lower plate
  • d (mm) represents the penetration depth
  • S RATIO S SLAG /S BEAD ⁇ 100...(2)
  • S BEAD (mm 2 ) is the bead surface area
  • S SLAG (mm 2 ) is the slag surface area, which is the area of the region covered with slag
  • S RATIO (%) is the slag coverage area ratio.
  • the average welding current I AVE is 100 A or more and 320 A or less
  • the pulse peak current Ip is 400 A or more and 600 A or less
  • the pulse peak time Tp is 1.5 ms or more and 3.5 ms or less
  • Ar gas having a volume percentage of 98% or more is used as a shielding gas during welding, A method for manufacturing an arc welded joint in which droplet transfer is achieved by short-circuiting the welding wire and the base metal.
  • stable penetration ensures excellent weld joint strength, and by suppressing slag generation, it is possible to obtain a weld joint with excellent corrosion resistance at the welded portion.
  • the above effects can be obtained without making special changes to the specifications of the welding equipment used in conventional carbon dioxide welding, MAG welding using a mixture of inert gas and active gas, or MIG welding using a gas mainly composed of inert gas.
  • FIG. 1 is a schematic diagram showing an example of a welded joint produced by arc welding.
  • 2(a) and 2(b) are schematic diagrams showing droplet transfer in conventional arc welding.
  • 3(a) and 3(b) are schematic diagrams illustrating short-circuit transfer in accordance with the present invention.
  • FIG. 2 is a schematic diagram illustrating the penetration depth and throat thickness in a cross section of a welded portion.
  • FIG. 2 is a schematic diagram showing a pulse current waveform in arc welding according to the present invention.
  • FIG. 2 is a schematic diagram showing the bead area and slag coverage area of a weld bead.
  • FIG. 2 is a schematic diagram showing a corrosion resistance test of a weld bead.
  • FIG. 1 is a schematic diagram showing an example of a welded joint produced by arc welding, illustrating an embodiment of the present invention.
  • fillet arc welding of a lap joint joining a corner made of two steel plates is shown as a representative example, but the shape of the welded joint and the welding position are not limited in the present invention.
  • the welding wire 1 which is continuously fed from the welding torch 2 through the center of the welding torch 2 to the base material 3 (more specifically, a weld line consisting of the corner of a step formed by stacking two layers of base material 3), is used as the anode, and the base material 3 is used as the cathode, and a welding voltage is applied from a welding power source (not shown).
  • a contact tip is attached to the welding torch 2, and serves to supply power to the welding wire 1 and to guide the feed.
  • An arc 5B is formed between the welding wire 1 and the base material 3 by ionizing a portion of the Ar shielding gas (not shown) supplied from inside the welding torch 2 and turning it into plasma.
  • the portion of the Ar shielding gas that does not ionize and flows from the welding torch 2 to the base material 3 serves to isolate the arc 5B and the molten pool (not shown in FIG. 1) formed by melting the base material 3 from the outside air.
  • Heat input from the arc 5B melts the tip of the welding wire 1 into a droplet, which is then transported to the molten pool by electromagnetic force, gravity, etc. This phenomenon occurs continuously as the welding torch 2 or base material 3 moves, causing the molten pool to solidify behind the weld line and forming a weld bead 6. This achieves the joining of at least two steel plates (base material 3).
  • the cathode spot is not fixed in MIG welding, which does not generate oxides derived from O 2 or CO 2 , and the cathode spot moves around the surface of the base material vigorously in search of a place with a low work function. For this reason, the heat input to the base material cannot be obtained stably, and a welded joint with an excessively small penetration depth or a large variation in the penetration depth is obtained.
  • the shielding property of the Ar shielding gas that blocks the intrusion of oxidizing gas into the molten pool is reduced, and the generation of slag may increase.
  • FIG. 2(a) and 2(b) are schematic diagrams illustrating droplet transfer in conventional MIG welding.
  • the welding wire 1 melts and is continuously transported from a long and thin liquid column to the molten pool 8 as shown in Fig. 2(a), and large droplets 7 are generated at the tip of the welding wire 1 and are transported to the molten pool 8 by falling or short-circuiting as shown in Fig. 2(b).
  • an effective means for stabilizing droplet transfer is to complete joining by so-called periodic short-circuit transfer, in which the non-short-circuit state of Fig. 3(a) and the short-circuit state of Fig. 3(b) are regularly repeated between the tip of the welding wire 1 and the base metal 3, and droplets 7 are transferred to the base metal 3 during the short-circuit state.
  • the penetration depth of the weld cross section as shown in Fig. 4 can be controlled to a predetermined value, and a predetermined welded joint strength can be obtained.
  • the arc welded joint has an upper plate 20, a lower plate 21, and a weld bead 6 that joins the upper plate 20 and the lower plate 21 and penetrates into the upper plate 20 and the lower plate 21.
  • the penetration depth 23 refers to the distance from the boundary 24 between the upper plate 20 and the lower plate 21 in the cross section of the weld to the underside of the weld bead 6.
  • the plate thickness t2 of the lower plate is designated by the symbol 22.
  • the thickness t2 of the lower plate and the penetration depth d satisfy the formula (1): 0.20 ⁇ d/ t2 ⁇ 0.80 (1)
  • t 2 (mm) represents the plate thickness of the lower plate
  • d (mm) represents the penetration depth. If d/t 2 is less than 0.20, poor penetration of the welded portion occurs, and the strength of the welded joint decreases. Therefore, d/t 2 is set to 0.20 or more.
  • d/t 2 is preferably 0.25 or more.
  • d/t 2 is more preferably 0.30 or more.
  • d/t 2 is even more preferably 0.32 or more. Most preferably 0.35 or more.
  • d/t 2 is set to 0.80 or less.
  • d/t 2 is preferably 0.75 or less.
  • d/t 2 is more preferably 0.70 or less.
  • d/t 2 is even more preferably 0.68 or less.
  • d/t 2 is most preferably 0.65 or less.
  • the thickness t1 of the upper plate and the thickness t2 of the lower plate are 5.0 mm or less. If the thickness t1 of the upper plate and the thickness t2 of the lower plate are greater than 5.0 mm, the penetration is insufficient due to the diffusion of heat input, and the throat thickness 25 shown in FIG. 4 is reduced, and the cross-sectional area (throat thickness x weld length) that bears the external load is insufficient, leading to a decrease in the strength of the welded joint. Therefore, the thickness t1 of the upper plate and the thickness t2 of the lower plate are set to 5.0 mm or less. It is preferable that the thickness t1 of the upper plate and the thickness t2 of the lower plate are set to 4.8 mm or less.
  • the thickness t1 of the upper plate and the thickness t2 of the lower plate are set to 4.5 mm or less. It is even more preferable that the thickness t2 of the upper plate and the thickness t2 of the lower plate are set to 4.2 mm or less. It is most preferable that the thickness t1 of the upper plate and the thickness t2 of the lower plate are set to 0.5 mm or more. It is more preferable that the thickness t2 of the upper plate and the thickness t2 of the lower plate are set to 0.8 mm or more, although there is no particular limit to the lower limit. It is more preferable that the weld length is 1.0 mm or more, and most preferable that the weld length is 1.2 mm or more. Note that the weld length refers to the length of the weld bead 6 in the weld line direction 11 shown in FIG.
  • Slag coverage area ratio S RATIO is 15% or less
  • the slag coverage area ratio S RATIO calculated by the following formula (2) using the bead surface area S BEAD of the weld bead surface and the slag surface area S SLAG , which is the area of the region covered with slag in the bead surface area S BEAD , exceeds 15%, rust and corrosion starting from the slag progress over a wide range of the welded part, and the strength of the welded joint may decrease due to a decrease in plate thickness. Therefore, the slag coverage area ratio S RATIO is set to 15% or less.
  • the slag coverage area ratio S RATIO is preferably 14% or less.
  • the slag coverage area ratio S RATIO is more preferably 12% or less.
  • the slag coverage area ratio S RATIO is further preferably 10% or less.
  • the slag coverage area ratio S RATIO is most preferably 8% or less.
  • the lower limit is not particularly limited and may be 0%.
  • S RATIO S SLAG /S BEAD ⁇ 100...(2)
  • S BEAD (mm 2 ) is the bead surface area
  • S SLAG (mm 2 ) is the slag surface area, which is the area of the region covered with slag
  • S RATIO (%) is the slag coverage area ratio.
  • FIG. 5 shows a schematic diagram of a pulse current waveform in the arc welding of the present invention.
  • Pulse welding is a method in which a pulse peak current (I p ) and a pulse base current (I b ) are periodically repeated to perform welding.
  • the average welding current I AVE is a value obtained by taking a time average of a welding current that changes periodically as shown in the pulse waveform of FIG. 5.
  • the average welding current I AVE is set to 100A or more.
  • the average welding current I AVE is preferably 120A or more.
  • the average welding current I AVE is more preferably 140A or more.
  • the average welding current I AVE is even more preferably 160A or more.
  • the average welding current I AVE is most preferably 180A or more.
  • the average welding current I AVE is set to 320 A or less.
  • the average welding current I AVE is preferably 300 A or less.
  • the average welding current I AVE is more preferably 270 A or less.
  • the average welding current I AVE is further preferably 260 A or less.
  • the average welding current I AVE is most preferably 250 A or less.
  • Pulse peak current I p is 400A or more and 600A or less When the pulse peak current I p is less than 400A, the heat input becomes too small, and the penetration depth decreases. Therefore, the pulse peak current I p is set to 400A or more.
  • the pulse peak current I p is preferably 450A or more.
  • the pulse peak current I p is more preferably 470A or more.
  • the pulse peak current I p is further preferably 490A or more.
  • the pulse peak current I p is most preferably 500A or more.
  • the pulse peak current I p is greater than 600A, the instantaneous heat input becomes too large, and a burn-through, which is a welding defect, may occur.
  • the pulse peak current I p is set to 600A or less.
  • the pulse peak current I p is preferably 590A or less.
  • the pulse peak current I p is more preferably 580A or less.
  • the pulse peak current Ip is more preferably 570 A or less.
  • the pulse peak current Ip is most preferably 560 A or less.
  • the pulse base current (I b ) is preferably 30 A or more.
  • the pulse base current (I b ) is more preferably 40 A or more.
  • the pulse base current (I b ) is even more preferably 45 A or more.
  • the pulse base current (I b ) is most preferably 50 A or more.
  • the pulse base current (I b ) is preferably 120 A or less. It is more preferable that the pulse base current (I b ) is 110 A or less. The pulse base current (I b ) is even more preferably 100 A or less. It is most preferable that the pulse base current (I b ) is 90 A or less.
  • Pulse peak time Tp is 1.5 ms or more and 3.5 ms or less
  • the pulse peak time Tp is set to 1.5 ms or more.
  • the pulse peak time Tp is preferably set to 1.8 ms or more.
  • the pulse peak time Tp is more preferably set to 2.0 ms or more.
  • the pulse peak time Tp is even more preferably set to 2.1 ms or more.
  • the pulse peak time Tp exceeds 3.5 ms, the heat input becomes too large, and burn-through, which is a welding defect, may occur.
  • the pulse peak time Tp is set to 3.5 ms or less.
  • the pulse peak time Tp is preferably set to 3.2 ms or less.
  • the pulse peak time Tp is more preferably set to 3.0 ms or less.
  • the pulse peak time Tp is even more preferably set to 2.9 ms or less.
  • the pulse peak time Tp is more preferably 2.8 ms or less.
  • the pulse peak current Ip , the pulse base current Ib , the pulse peak time Tp , the rise time Tup from the pulse base current to the pulse peak current, the fall time Tdown from the pulse peak current to the pulse base current, the arc voltage V, and the welding speed W satisfy the following formula (3) (preferable condition): ( 3 ) Ip (A): pulse peak current, Ib (A): pulse base current, Tp (ms): pulse peak time, Tup (ms): rise time, Tdown (ms): fall time, V (V): arc voltage, W (cm/s): welding speed If ( Ip x ( Tp + Tup + Tdown ) - (Ip - Ib ) x ( Tup + Tdown )/2)/( Tp + Tup + Tdown ) x V/W/1000 is less than 5.8 kJ/cm, the heat input at the peak which affects the penetration becomes too small, and the penetration depth 23 decreases.
  • (Ip x (Tp + Tup + Tdown ) - (Ip - Ib ) x ( Tup + Tdown ) / 2) / ( Tp + Tup + Tdown ) x V/W/1000 is preferably 5.8 kJ/cm or more. More preferably, it is 6.5 kJ/cm or more. Even more preferably, it is 7.0 kJ/cm or more. Most preferably, it is 7.5 kJ/cm or more. Furthermore, if it exceeds 14.4 kJ/cm, the heat input becomes too large, and burn-through, which is a welding defect, may occur.
  • (Ip x ( Tp + Tup + Tdown ) - (Ip - Ib ) x ( Tup + Tdown ) / 2) / ( Tp + Tup + Tdown ) x V/W/1000 is preferably 14.4 kJ/cm or less. More preferably, it is 12.8 kJ/cm or less. Even more preferably, it is 11.5 kJ/cm or less. Most preferably, it is 10.2 kJ/cm or less.
  • the Ar gas ratio of the shielding gas is set to 98% by volume or more.
  • the Ar gas ratio of the shielding gas is preferably 99% by volume or more. There is no particular upper limit, and the Ar gas ratio may be 100%.
  • the welding wire 1 used in the present invention is not particularly limited.
  • a solid wire for MAG welding as described in JIS Z 3312 can be used.
  • the base material 3 of the present invention is intended for steel sheets and plated steel sheets.
  • the composition of the steel sheets is not limited, but for example, a steel sheet containing C: 0.02-0.3 mass%, Si: 0.01 mass% or more, Mn: 0.5% mass% or more, P: 0.05 mass% or less, and S: 0.05 mass% or less is preferable, and other alloy elements such as Cu, Ni, Cr, and Ti may be contained.
  • Si is preferably 3.0 mass% or less
  • Mn is preferably 5.0 mass% or less.
  • the lower limit of P is not particularly limited, but is preferably 0.0005 mass% or more
  • the lower limit of S is not particularly limited, but is preferably 0.0005 mass% or more.
  • the plating composition of plated steel sheets is not particularly limited, but an example is Zn.
  • the welded steel plates obtained in the above manner were evaluated for slag coverage area ratio, penetration depth, corrosion resistance of the weld, and weld joint strength according to the following test methods.
  • FIG. 6 is a schematic diagram showing the bead area and the slag-covered area in a weld bead.
  • the bead surface area S BEAD and the slag-covered surface area S SLAG shown in Fig. 6 are calculated by photographing the surface of the region of the weld bead 6 excluding the bead start and end portions 10 (each 15 mm long) from directly above and measuring the projected areas from the top surface of the weld bead 6 and the slag.
  • the length of the weld bead 6 is less than 130 mm, the surface of the entire length excluding the bead start and end portions 10 is photographed.
  • the penetration depth d was measured by observing a cross section in the plate thickness direction perpendicular to the weld line (parallel to the straight line AA in FIG. 6) at five arbitrary points of the weld bead 6 as shown in FIG. 4 in an area excluding the bead start and end points 10 (each 15 mm long). However, the five arbitrary points were located at positions 5 mm or more apart from each other.
  • the arbitrary points of the weld bead 6 were cut in the plate thickness direction perpendicular to the weld line, and the penetration depths 23 of each were obtained, and the average value of these was taken as the "penetration depth d (mm)".
  • a value of d/ t2 ( t2 is the plate thickness of the lower plate) of 0.20 to 0.80 was considered to be acceptable.
  • FIG. 7 is a schematic diagram showing the state of the corrosion resistance test in the weld bead.
  • the arc welded joint after the corrosion test was immersed in an immersion stripper to remove the electrocoating, and then the corrosion products were removed in accordance with ISO8407.
  • the weld bead 6 included the bead start and end portions 10 (each 15 mm long)
  • the surface of the area excluding the bead start and end portions 10 was photographed, and the obtained photograph was analyzed to measure the maximum corrosion width H MAX in the corroded area 12 in the direction perpendicular to the weld line direction 11 from the bead toe.
  • the corrosion resistance was evaluated as excellent when the maximum corrosion width H MAX was less than 6.0 mm, and insufficient when the maximum corrosion width H MAX was 6.0 mm or more, and was evaluated as insufficient when the maximum corrosion width H MAX was 6.0 mm or more.
  • a tensile test piece according to JIS Z 2241 was obtained from the welded joint by machining.
  • the tensile test piece was prepared so that the welded part was in the center.
  • a tensile test of the prepared tensile test piece a tensile test was performed at room temperature with a tensile speed of 10 mm/min to obtain the tensile strength of the joint.
  • the value obtained by dividing this value by the tensile strength of the base material (here, simply referred to as the strength ratio) was used as an evaluation parameter of the welded joint strength.
  • the evaluation of the welded joint strength was performed as follows: when the strength ratio was 0.6 or more, it was judged to be more excellent and was marked with " ⁇ ", when it was 0.5 or more and less than 0.6, it was judged to be excellent and was marked with " ⁇ ", and when it was less than 0.5, it was judged that the welded joint strength was insufficient and was marked with " ⁇ ".
  • the S RATIO was 15% or less and the d/ t2 was 0.20 or more and 0.80 or less, and weld joints excellent in corrosion resistance and weld joint strength were obtained.
  • Weld Nos. 1 to 4 and 12 to 14 had an S RATIO of 15% or less and d/ t2 of 0.30 to 0.70, and thus weld joints with superior corrosion resistance and weld joint strength were obtained.
  • the S RATIO was greater than 15%, or d/ t2 was less than 0.20 or greater than 0.80, and good weld joints were not obtained.
  • the evaluation was A when "S RATIO is 15% or less, d/ t2 is 0.30 to 0.70, and the welded joint strength is 'A'"
  • the evaluation was B when "S RATIO is 15% or less, d/ t2 is 0.20 to 0.30, or S RATIO is 15% or less, d/ t2 is more than 0.70 and 0.80 or less, and the welded joint strength is ' ⁇ '”
  • Evaluation F was considered to be a failure, and evaluations A and B were considered to be passes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
PCT/JP2024/001190 2023-04-25 2024-01-18 アーク溶接継手およびその製造方法 Ceased WO2024224712A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2024515388A JP7677536B2 (ja) 2023-04-25 2024-01-18 アーク溶接継手およびその製造方法
KR1020257034586A KR20250168363A (ko) 2023-04-25 2024-01-18 아크 용접 조인트 및 그의 제조 방법
CN202480025912.6A CN121001844A (zh) 2023-04-25 2024-01-18 电弧焊接接头及其制造方法
EP24796471.1A EP4681852A1 (en) 2023-04-25 2024-01-18 Arc welded joint and method for manufacturing same
MX2025012410A MX2025012410A (es) 2023-04-25 2025-10-16 Junta soldada por arco y metodo para fabricar la misma

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023-071307 2023-04-25
JP2023071307 2023-04-25

Publications (1)

Publication Number Publication Date
WO2024224712A1 true WO2024224712A1 (ja) 2024-10-31

Family

ID=93255831

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/001190 Ceased WO2024224712A1 (ja) 2023-04-25 2024-01-18 アーク溶接継手およびその製造方法

Country Status (6)

Country Link
EP (1) EP4681852A1 (https=)
JP (1) JP7677536B2 (https=)
KR (1) KR20250168363A (https=)
CN (1) CN121001844A (https=)
MX (1) MX2025012410A (https=)
WO (1) WO2024224712A1 (https=)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0833997A (ja) 1994-07-21 1996-02-06 Sumitomo Metal Ind Ltd 溶接部およびその近傍の塗装後耐食性を高めるガスシールドメタルアーク溶接方法
JPH0920994A (ja) 1995-07-03 1997-01-21 Sumitomo Metal Ind Ltd アーク溶接部及びその近傍の塗装後耐食性改善方法
JP5549615B2 (ja) 2011-02-04 2014-07-16 Ｊｆｅスチール株式会社 鋼製部材の化成処理方法、電着塗装を施した鋼製塗装部材の製造方法、および鋼製塗装部材
JP2017164798A (ja) * 2016-03-17 2017-09-21 Ｊｆｅスチール株式会社 ガスシールドアーク溶接方法及び溶接構造部品
WO2021210335A1 (ja) * 2020-04-15 2021-10-21 Ｊｆｅスチール株式会社 アーク溶接継手およびアーク溶接方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0833997A (ja) 1994-07-21 1996-02-06 Sumitomo Metal Ind Ltd 溶接部およびその近傍の塗装後耐食性を高めるガスシールドメタルアーク溶接方法
JPH0920994A (ja) 1995-07-03 1997-01-21 Sumitomo Metal Ind Ltd アーク溶接部及びその近傍の塗装後耐食性改善方法
JP5549615B2 (ja) 2011-02-04 2014-07-16 Ｊｆｅスチール株式会社 鋼製部材の化成処理方法、電着塗装を施した鋼製塗装部材の製造方法、および鋼製塗装部材
JP2017164798A (ja) * 2016-03-17 2017-09-21 Ｊｆｅスチール株式会社 ガスシールドアーク溶接方法及び溶接構造部品
WO2021210335A1 (ja) * 2020-04-15 2021-10-21 Ｊｆｅスチール株式会社 アーク溶接継手およびアーク溶接方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4681852A1

Also Published As

Publication number Publication date
KR20250168363A (ko) 2025-12-02
MX2025012410A (es) 2025-12-01
JP7677536B2 (ja) 2025-05-15
JPWO2024224712A1 (https=) 2024-10-31
EP4681852A1 (en) 2026-01-21
CN121001844A (zh) 2025-11-21

Similar Documents

Publication Publication Date Title
JP7238990B2 (ja) アーク溶接継手およびアーク溶接方法
EP1964638B1 (en) MIG welded joint between aluminium and steel members and MIG welding process
CN1448240A (zh) Mag焊接用钢丝及使用它的mag焊接方法
KR102910129B1 (ko) 아크 용접 이음매 및 아크 용접 방법
CN107848058A (zh) 镀锌钢板的焊接方法
JP7574948B2 (ja) 重ね隅肉アーク溶接方法および溶接継手の製造方法
JP7677536B2 (ja) アーク溶接継手およびその製造方法
JP2009262198A (ja) 鋼材とアルミニウム材のｍｉｇ溶接継手の製造方法及び鋼材とアルミニウム材のｍｉｇ溶接継手
JP7364089B2 (ja) アーク溶接継手およびアーク溶接方法
JP7508016B1 (ja) アーク溶接継手およびその製造方法
JP5173558B2 (ja) 鋼材とアルミニウム材のｍｉｇ溶接継手の製造方法
JP7435932B1 (ja) 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
JP7435931B1 (ja) 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
WO2024224713A1 (ja) アーク溶接継手およびその製造方法
WO2024095613A1 (ja) 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) 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
JP7364088B2 (ja) アーク溶接継手およびアーク溶接方法
WO2026083719A1 (ja) ガスシールドアーク溶接継手の製造方法
EP4541497A1 (en) Method for manufacturing arc welded joint, arc welded joint, and automotive component

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 2024515388

Country of ref document: JP

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24796471

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2501006948

Country of ref document: TH

WWE Wipo information: entry into national phase

Ref document number: 2024796471

Country of ref document: EP

Ref document number: 202517099752

Country of ref document: IN

ENP Entry into the national phase

Ref document number: 1020257034586

Country of ref document: KR

Free format text: ST27 STATUS EVENT CODE: A-0-1-A10-A15-NAP-PA0105 (AS PROVIDED BY THE NATIONAL OFFICE)

WWE Wipo information: entry into national phase

Ref document number: KR1020257034586

Country of ref document: KR

Ref document number: 1020257034586

Country of ref document: KR

Ref document number: MX/A/2025/012410

Country of ref document: MX

ENP Entry into the national phase

Ref document number: 2024796471

Country of ref document: EP

Effective date: 20251015

ENP Entry into the national phase

Ref document number: 2024796471

Country of ref document: EP

Effective date: 20251015

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2024796471

Country of ref document: EP

Effective date: 20251015

WWP Wipo information: published in national office

Ref document number: MX/A/2025/012410

Country of ref document: MX

WWP Wipo information: published in national office

Ref document number: 1020257034586

Country of ref document: KR

WWP Wipo information: published in national office

Ref document number: 202517099752

Country of ref document: IN

ENP Entry into the national phase

Ref document number: 2024796471

Country of ref document: EP

Effective date: 20251015

ENP Entry into the national phase

Ref document number: 2024796471

Country of ref document: EP

Effective date: 20251015