WO2016194400A1 - Arc welding method for hot-dip galvanized steel plate having excellent appearance of welded part and high welding strength, method for manufacturing welding member, and welding member - Google Patents

Arc welding method for hot-dip galvanized steel plate having excellent appearance of welded part and high welding strength, method for manufacturing welding member, and welding member Download PDF

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Publication number
WO2016194400A1
WO2016194400A1 PCT/JP2016/053048 JP2016053048W WO2016194400A1 WO 2016194400 A1 WO2016194400 A1 WO 2016194400A1 JP 2016053048 W JP2016053048 W JP 2016053048W WO 2016194400 A1 WO2016194400 A1 WO 2016194400A1
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Prior art keywords
hot
welding
plated steel
dip
steel sheet
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PCT/JP2016/053048
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French (fr)
Japanese (ja)
Inventor
和昭 細見
延時　智和
仲子　武文
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日新製鋼株式会社
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Priority claimed from JP2015154570A external-priority patent/JP6114785B2/en
Priority to SG11201709785QA priority Critical patent/SG11201709785QA/en
Priority to RU2017145145A priority patent/RU2701700C2/en
Priority to US15/577,474 priority patent/US10906113B2/en
Priority to MYPI2017704451A priority patent/MY187145A/en
Priority to EP16802839.7A priority patent/EP3305453B1/en
Application filed by 日新製鋼株式会社 filed Critical 日新製鋼株式会社
Priority to BR112017025443-3A priority patent/BR112017025443A2/en
Priority to KR1020177035271A priority patent/KR102190331B1/en
Priority to AU2016271967A priority patent/AU2016271967C1/en
Priority to MX2017015217A priority patent/MX2017015217A/en
Priority to CN201680031198.7A priority patent/CN107921570B/en
Priority to CA2987380A priority patent/CA2987380A1/en
Publication of WO2016194400A1 publication Critical patent/WO2016194400A1/en
Priority to PH12017502162A priority patent/PH12017502162A1/en

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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
    • B23K9/09—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
    • 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
    • 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

Definitions

  • the present invention relates to an arc welding method, a manufacturing method for a welded member, and a welded member for a hot-dip Zn-based plated steel sheet, which generates less spatter and blowholes and has an excellent appearance and weld strength.
  • the hot-dip Zn-based plated steel sheet Since the hot-dip Zn-based plated steel sheet has good corrosion resistance, it is used in a wide range of applications including building and automobile parts. Among them, a hot-dip Zn—Al—Mg-based steel sheet having an Al concentration of 1% by mass or more maintains excellent corrosion resistance for a long period of time, and therefore, the demand is increasing as a substitute for a conventional hot-dip Zn-plated steel sheet. In addition, the Al concentration in the plating layer in the conventional hot-dip Zn-plated steel sheet is usually 0.3% by mass or less (see JIS G3302).
  • blowholes include pits unless otherwise specified
  • blowholes include pits unless otherwise specified
  • the boiling point of Zn is as low as about 906 ° C. compared with the melting point of Fe of about 1538 ° C., so that Zn vapor is generated during arc welding, the arc becomes unstable due to this Zn vapor, and spatter is generated.
  • blowholes are generated when the molten pool solidifies before the Zn vapor can escape.
  • a hot-dip Zn-based plated steel sheet having a coating adhesion amount of 120 g / m 2 or more is used for members that require long-term durability. Sputtering and blowholes are significantly generated.
  • a pulse arc welding method has been proposed as a method of suppressing spatter and blowholes in a hot-dip Zn-based plated steel sheet.
  • the pulse arc welding method the droplets are reduced in size and spatter is suppressed.
  • the molten pool is agitated by the pulse arc and the molten pool is pushed down to make the molten pool thinner, and the release of Zn vapor is promoted to suppress blowholes.
  • Patent Document 1 discloses a pulse arc welding method in which the welding wire composition, the peak current of the pulse current waveform, the peak time, and the base current are controlled within appropriate ranges to suppress spatter and blowholes.
  • Patent Document 1 only discloses an embodiment of a thin-walled hot-dip Zn-plated steel sheet having a coating adhesion amount of 45 g / m 2 per side, and a method for suppressing spatter and blowholes of a thick-hot-working hot-dip Zn-plated steel sheet. Is not described.
  • Patent Document 1 targets a welded Zn-plated steel sheet whose Al concentration in the plating layer is usually 0.3% by mass or less. Since the melting point of the plating layer varies depending on the Al concentration, the Al concentration in the plating layer affects the behavior of the plating layer during welding. Therefore, the technique of Patent Document 1 cannot be applied as it is to a hot-dip Zn-based plated steel sheet (for example, hot-melted Zn—Al—Mg-based steel sheet) containing an Al concentration of 1% by mass or more.
  • a hot-dip Zn-based plated steel sheet for example, hot-melted Zn—Al—Mg-based steel sheet
  • an object of the present invention is to provide an arc welding method and a welding member for a hot-dip Zn-based plated steel sheet, which has an excellent weld appearance and weld strength and contains an Al concentration of 1% by mass or more.
  • the average welding current, average welding voltage, pulse period, in the plating layer using a pulsed arc welding method in arc welding of a hot-dip Zn-based plated steel sheet containing Al concentration of 1% by mass or more has been completed by obtaining the knowledge that sputtering and blowholes can be suppressed without impairing the appearance of the welded part by controlling the Al concentration and the plating adhesion amount within appropriate ranges.
  • the composition of the plating layer of the hot-dip Zn-plated steel sheet contains Zn as a main component and contains Al: 1.0 to 22.0% by mass, Plating adhesion amount W is 15 to 250 g / m 2 , average welding current is 100 to 350 A, average welding voltage is 20 to 35 V, and the current waveform of the welding current is a pulse with a peak current and a base current of 1 to 50 ms.
  • This is an arc welding method for a hot-dip Zn-based plated steel sheet by performing arc welding, which is a pulse current waveform that repeats periodically.
  • the present invention it is possible to suppress spatter and blowholes in arc welding of a hot-dip Zn-based plated steel sheet, and to provide a welded member that is excellent in appearance, weld strength, and corrosion resistance.
  • the figure which showed the pulse current waveform and the pulse voltage waveform typically.
  • the figure which showed the pulse arc welding phenomenon typically.
  • Fig. 1 schematically shows the current waveform and voltage waveform in the pulse arc welding method.
  • the pulsed arc welding method is an arc welding method in which the peak current IP and the base current IB are alternately repeated, and the peak current IP is set to be equal to or higher than the critical current at which the droplets are sprayed.
  • the peak current IP is equal to or higher than the critical current
  • a constriction occurs in the droplet at the tip of the welding wire due to the pinch effect due to electromagnetic force
  • the droplet is reduced in size, and regular droplet transfer is performed at each pulse period, thereby suppressing spattering.
  • the peak current IP is equal to or lower than the critical current, the droplet transfer becomes irregular and the droplet grows large, so that the short circuit with the molten pool causes spattering.
  • Fig. 2 schematically shows the welding phenomenon in the pulse arc welding method.
  • the small droplets 5 are transferred from the welding wire 2 to the molten pool 3, a short circuit does not occur and spattering is suppressed.
  • the molten pool 3 directly under the arc is pushed down by the pulse arc 4 and becomes thin, Zn vapor is easily discharged, and blow holes are suppressed.
  • the average welding current, the average welding voltage, and the pulse period are controlled within an appropriate range, and the viscosity of the molten pool is reduced by appropriately managing the plating adhesion amount and the Al concentration of the plating layer, thereby reducing the amount of Zn vapor. Discharge is promoted to suppress spatter and blowholes.
  • FIG. 4 shows the results of investigating the influence of the Al concentration in the plating layer and the amount of plating applied on the blow hole occupancy Br and the number of sputters attached.
  • the blowhole occupancy Br is 30% or less, there is no problem in welding strength. Further, if the number of sputters deposited is 20 or less, the spatter is not noticeable and the influence on the corrosion resistance is small. Therefore, in FIG. 4, the case where the blowhole occupancy is 30% or less and the number of sputter deposits of 20 or less is indicated by ⁇ , and the case where the blowhole occupancy exceeds 30% or the amount of sputter adherence exceeds 20 is plotted by ⁇ . In the region surrounded by the four straight lines in FIG. 4, the blow hole occupancy Br is 30% or less and the number of sputter depositions is 20 or less. It can be seen that blowholes can be suppressed.
  • a hot dip Zn-based plated steel sheet having a plating layer containing an Al concentration of 1 to 22% by mass and having a plating adhesion amount of 15 to 250 g / m 2 per side, an average welding current of 100 to 350 A, Sputtering and blowholes can be suppressed by performing pulse arc welding after appropriately setting the average welding voltage in the range of 20 to 35 V and the pulse period in the range of 1 to 50 ms.
  • the blowhole occupancy is within a range where the Al concentration C Al (mass%) in the plating layer and the plating adhesion amount W (g / m 2 ) satisfy C Al ⁇ 0.0085W + 0.87. It has been shown that the amount of spatter deposition exceeds 30% or 20 spatter deposits.
  • the average welding current in the range of C Al ⁇ 0.0085 W + 0.87 In addition to the average welding voltage and pulse period, adjustment of the welding speed and shield gas composition other than these is necessary, but in the range of 0.0085W + 0.87 ⁇ C Al , the average welding current, average welding voltage, and pulse period Adjustment is sufficient. Therefore, in order to suppress the blow hole occupation ratio to 30% or less and the number of sputtered deposits to 20 or less, it is preferable that the range is 0.0085W + 0.87 ⁇ C Al .
  • the current waveform is a pulse waveform that repeats the peak current and the base current, and the average welding current IA is preferably in the range of 100 to 350A.
  • the average welding current IA is represented by the following formula (3).
  • IA ((IP ⁇ TIP) + (IB ⁇ TIB)) / (TIP + TIB) (3) here, IP: Peak current (A) IB: Base current (A) TIP: Peak current period (ms) TIB: Base current period (ms) If the average welding current is less than 100 A, heat input is insufficient, the temperature of the molten pool decreases, the viscosity increases, Zn vapor is difficult to be discharged, Zn vapor remains in the molten pool, and blowholes are generated. The welding current is linked to the feed amount of the welding wire, and if the welding current is increased more than necessary, the droplets become coarse and short-circuit with the molten pool to cause spattering.
  • the average welding voltage EA is preferably in the range of 20 to 35V.
  • the average welding voltage EA is expressed by the following equation (4).
  • EA ((EP ⁇ TEP) + (EB ⁇ TEB)) / (TEP + TEB) (4) here, EP: Peak voltage (V) EB: Base voltage (V) TEP: Peak voltage period (ms) TEB: Base voltage period (ms)
  • EA Peak voltage period (ms)
  • the pulse period PF is in the range of 1 to 50 ms. If it is less than 1 ms, droplet transfer becomes unstable and spatter occurs. On the other hand, if it exceeds 50 ms, the period during which no arc is generated becomes too long, and the effect of depressing the molten pool becomes weak, and Zn vapor is hardly discharged, resulting in spatter and blowholes.
  • the welding speed is not particularly limited. It selects suitably by the plate
  • an Ar—CO 2 mixed gas is used for spray transfer of droplets. Also in the present invention, Ar—CO 2 mixed gas is used as the shielding gas.
  • Ar-30 vol% CO 2 gas, Ar-20 vol% CO 2 gas, or Ar-5 vol% CO 2 gas with a lower CO 2 concentration is preferable because it has a great sputtering suppression effect.
  • the hot-dip Zn-based plated steel sheet according to the present invention has a plating layer composition containing Zn as a main component, and contains Al: 1.0 to 22.0% by mass, and a plating adhesion W is 15 to 250 g / m 2 . is there.
  • the plating adhesion amount W and the Al concentration C Al in the plating layer satisfy the relationship of the following formula (1).
  • the plated layer of the hot-dip Zn-plated steel sheet is further mass%, Mg: 0.05 to 10.0%, Ti: 0.002 to 0.10%, B: 0.001 to 0.05%, Si: One or two or more selected from the group consisting of 0 to 2.0% and Fe: 0 to 2.5% can be contained.
  • the method of hot dip plating is not particularly limited, but generally it is advantageous in terms of cost to use an in-line annealing type hot dip plating facility.
  • the plating layer composition substantially reflects the hot-dip plating bath composition.
  • component elements of the plating layer will be described. “%” Of the plating layer component element means “mass%” unless otherwise specified.
  • Al is effective in improving the corrosion resistance of the plated steel sheet and suppresses the generation of Mg oxide dross in the plating bath. Furthermore, as shown in FIG. 5, Al has the effect of lowering the viscosity of Fe when added in a small amount, and during arc welding, Al in the plating layer is taken into the molten pool to lower the viscosity of the molten pool and promote the discharge of Zn vapor. Thus, spatter and blowholes are suppressed. In order to fully exhibit these actions, it is necessary to secure an Al content of 1.0% or more, and it is more preferable to secure an Al content of 4.0% or more.
  • the Al content is more preferably 22.0% or less, and may be controlled to 15.0% or less, or even 10.0% or less.
  • Mg exhibits the effect of significantly increasing the corrosion resistance of the plated steel sheet by generating a uniform corrosion product on the surface of the plated layer.
  • the Mg content is more preferably 0.05% or more, and more preferably 1.0% or more.
  • the Mg content in the plating bath increases, Mg oxide-based dross is likely to occur, which causes a deterioration in the quality of the plating layer, so the Mg content is set to a range of 10.0% or less.
  • Mg has a boiling point of about 1091 ° C., which is lower than the melting point of Fe, and, like Zn, is considered to evaporate during arc welding and cause spatter and blowholes. Therefore, the Mg content is preferably 10.0% or less.
  • the amount of Ti added is less than 0.002%, the suppression effect is insufficient, and if it exceeds 0.1%, the appearance of the plating layer surface due to the formation and growth of Ti-Al-based precipitates during plating become. Therefore, in the present invention, the amount of Ti added is limited to 0.002 to 0.1%.
  • B like Ti, has the effect of suppressing the formation and growth of Zn 11 Mg 2 phase. In the case of B, it is more effective to make the addition amount 0.001% or more. However, excessive addition of B causes poor appearance of the plating layer surface due to Ti-B or Al-B-based precipitates, so it is desirable that B is in the range of 0.05% or less.
  • Si When Si is contained in the hot dipping bath, excessive growth of the Fe—Al alloy layer formed at the interface between the plating original plate surface and the plating layer is suppressed, and the workability of the hot-dip Zn—Al—Mg plated steel sheet is improved. This is advantageous. Therefore, Si can be contained as necessary. In that case, it is more effective to set the Si content to 0.005% or more. However, since excessive Si content causes an increase in the dross amount in the hot dipping bath, the Si content is preferably 2.0% or less.
  • Fe is likely to be mixed because the steel sheet is immersed and passed.
  • the corrosion resistance is lowered, so the Fe content is preferably 2.5% or less.
  • blow hole occupancy, number of spatters attached According to the Architectural Thin Plate Welded Joint Design and Construction Manual (Architecture of Thin Plate Welded Joint Design and Construction Manual Editorial Committee), measurement of the integrated value ⁇ di (mm) of blowhole length schematically shown in FIG. If the blow hole occupancy Br calculated by the following equation (2) from the value is 30% or less, there is no problem in the welding strength.
  • the welded member of the present invention is excellent in weld strength when the blowhole occupation ratio Br is 30% or less.
  • the welded member of the present invention has a sputter adhesion number of 20 or less, and is excellent in welded portion appearance and corrosion resistance.
  • the composition of the plating layer of the hot-dip Zn-plated steel sheet is mainly composed of Zn and is Al: 1.0-22 by mass%. 0.0%, with a coating weight W of 15 to 250 g / m 2 , an average welding current of 100 to 350 A, an average welding voltage of 20 to 35 V, and a current waveform of the welding current corresponding to the peak current and the base current
  • arc welding method for a hot-dip Zn-based plated steel sheet by performing arc welding which is a pulse current waveform in which current is repeated at a pulse period of 1 to 50 ms.
  • the arc welding method of the hot-dip Zn-based plated steel sheet according to the present embodiment is such that the coating weight W (g / m 2 ) of the hot-dip Zn-plated steel sheet and the Al concentration C Al (mass%) in the plated layer are Formula (1) below 0.0085W + 0.87 ⁇ C Al ⁇ 22 (1) It is preferable to satisfy this relationship.
  • the plating layer of the hot-dip Zn-plated steel sheet is further mass%, Mg: 0.05 to 10.0%, Ti: 0.002 Or 0.10%, B: 0.001 to 0.05%, Si: 0 to 2.0%, Fe: 1 to 2 or more selected from the group consisting of 0 to 2.5% it can.
  • the blowhole occupancy ratio Br shown by the following formula (2) is 30% or less, and the length is 100 mm and the width is 100 mm centering on the weld bead.
  • This is an arc welding method for a hot-dip Zn-based plated steel sheet, which is arc-welded so that the number of sputters deposited in this region is 20 or less.
  • hot-dip Zn-based plated steel sheets in which the composition of the plating layer is mainly composed of Zn and contains Al: 1.0 to 22.0% by mass%.
  • a method for producing a welded member joined by arc welding wherein the adhesion amount W per side of the hot-dip Zn-based plated steel sheet is 15 to 250 g / m 2 , the average welding current is 100 to 350 A, and the average welding
  • arc welding in which the voltage is 20 to 35 V and the current waveform of the welding current is a pulse current waveform in which the peak current and the base current are repeated at a pulse period of 1 to 50 ms, is performed between the hot-dip Zn-based plated steel sheets.
  • the composition of the plating layer is composed of Zn as a main component, and hot-dip Zn-based plated steel sheets containing Al: 1.0 to 22.0% by mass% are made of each other.
  • the sputter adhesion number in the region of 100 mm in length and 100 mm in width is 20 or less, and the welded portion appearance and corrosion resistance are excellent.
  • a cold rolled steel strip having a plate thickness of 3.2 mm and a plate width of 1000 mm was used as a plating original plate, and this was passed through a hot dipping line to produce a hot-dip Zn—Al—Mg plated steel plate.
  • a sample having a width of 100 mm and a length of 200 mm was cut out from the plated steel sheet, and pulsed arc welding was performed with a lap fillet welded joint.
  • As the solid wire JIS Z3312 YGW12 was used, the welding speed was 0.4 m / min, the bead length was 180 mm, and the overlap margin was 30 mm.
  • Other welding conditions are shown in Tables 1 and 2. After the pulse arc welding, an X-ray transmission photograph was taken, and the blow hole occupation ratio Br was measured by the method described above. Moreover, the number of spatter adhesion was measured visually.
  • Table 1 shows examples of pulse arc welding according to the present invention.
  • Table 2 shows a reference example in which the Al concentration C Al (mass%) in the plating layer and the plating adhesion amount W (g / m 2 ) are in the range of C Al ⁇ 0.0085W + 0.87, and in the plating layer A comparative example in which pulsed arc welding is performed with an Al concentration outside the range of the present invention is shown.
  • the blowhole occupancy was 30% or less and the number of sputters deposited was 20 or less. From this example, it can be seen that the present invention can provide a hot-dip Zn—Al—Mg-based plated steel-iron-welded member with excellent weld appearance, corrosion resistance, and weld strength.

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Abstract

A method for arc welding a hot-dip galvanized steel plate (1,1'), wherein: the average welding current is 100-350 A; the average welding voltage is 20-35 V; the waveform is a pulse current waveform including a peak current and a base current alternately repeated at a pulse cycle of 1-50 ms; a plated layer of the hot-dip galvanized steel plate (1,1') has a composition comprising Zn as a main component and containing 1.0-22.0 mass% of Al; and the plating deposition amount W is 15-250 g/m2.

Description

溶接部外観と溶接強度に優れた溶融Ｚｎ系めっき鋼板のアーク溶接方法、溶接部材の製造方法および溶接部材Arc welding method for hot-dip Zn-plated steel sheet excellent in weld appearance and weld strength, manufacturing method for welded member, and welded member
　本発明は、スパッタとブローホールの発生量が少なく溶接部外観と溶接強度に優れた溶融Ｚｎ系めっき鋼板のアーク溶接方法、溶接部材の製造方法および溶接部材に関する。 The present invention relates to an arc welding method, a manufacturing method for a welded member, and a welded member for a hot-dip Zn-based plated steel sheet, which generates less spatter and blowholes and has an excellent appearance and weld strength.
　溶融Ｚｎ系めっき鋼板は耐食性が良好であるため建築部材や自動車部材をはじめとする広範な用途に使用されている。なかでもＡｌ濃度が１質量％以上含む溶融Ｚｎ－Ａｌ－Ｍｇ系めっき鋼板は長期間にわたり優れた耐食性を維持することから、従来の溶融Ｚｎめっき鋼板に代わる材料として需要が増加している。なお、従来の溶融Ｚｎめっき鋼板におけるめっき層中のＡｌ濃度は通常０．３質量％以下である（ＪＩＳ　Ｇ３３０２参照）。 Since the hot-dip Zn-based plated steel sheet has good corrosion resistance, it is used in a wide range of applications including building and automobile parts. Among them, a hot-dip Zn—Al—Mg-based steel sheet having an Al concentration of 1% by mass or more maintains excellent corrosion resistance for a long period of time, and therefore, the demand is increasing as a substitute for a conventional hot-dip Zn-plated steel sheet. In addition, the Al concentration in the plating layer in the conventional hot-dip Zn-plated steel sheet is usually 0.3% by mass or less (see JIS G3302).
　溶融Ｚｎ系めっき鋼板を建築部材、自動車部材等に用いる場合、アーク溶接法で組み立てられることが多い。しかし、溶融Ｚｎ系めっき鋼板をアーク溶接するとスパッタおよびピット、ブローホール（以下、特に記述しない限りブローホールはピットを含める）の発生が著しく、アーク溶接性に劣る。これは、Ｆｅの融点約１５３８℃に比べてＺｎの沸点が約９０６℃と低いため、アーク溶接時にＺｎ蒸気が発生し、このＺｎ蒸気によりアークが不安定になり、スパッタが発生する。また、Ｚｎ蒸気が抜けきらない内に溶融池が凝固するとブローホールが発生する。スパッタがめっき面に付着すると溶接部外観が低下するだけでなく、その部分が腐食の起点となるので耐食性が低下する。一方、ブローホールの発生が著しいと溶接強度が低下して問題となる。 When using hot-dip Zn-based plated steel sheets for building members, automobile members, etc., they are often assembled by arc welding. However, when arc welding is performed on a hot-dip Zn-based plated steel sheet, spatter, pits and blowholes (hereinafter, blowholes include pits unless otherwise specified) are remarkably inferior in arc weldability. This is because the boiling point of Zn is as low as about 906 ° C. compared with the melting point of Fe of about 1538 ° C., so that Zn vapor is generated during arc welding, the arc becomes unstable due to this Zn vapor, and spatter is generated. In addition, blowholes are generated when the molten pool solidifies before the Zn vapor can escape. When spatter adheres to the plated surface, not only the appearance of the welded portion is lowered, but also the corrosion resistance is lowered because that portion becomes a starting point of corrosion. On the other hand, if the occurrence of blowholes is significant, the welding strength decreases, which causes a problem.
　特に、長期耐久性が要求される部材ではめっき付着量１２０ｇ／ｍ２以上の厚目付の溶融Ｚｎ系めっき鋼板が使用されるが、厚目付になるほどアーク溶接時のＺｎ蒸気量が多くなるのでよりスパッタ、ブローホールの発生が著しくなる。 In particular, for members that require long-term durability, a hot-dip Zn-based plated steel sheet having a coating adhesion amount of 120 g / m 2 or more is used. Sputtering and blowholes are significantly generated.
　溶融Ｚｎ系めっき鋼板のスパッタ、ブローホールを抑制する方法としてパルスアーク溶接法が提案されている。パルスアーク溶接法によれば、溶滴が小粒化してスパッタが抑制される。また、パルスアークにより溶融池が攪拌されるとともに溶融池が押し下げられて溶融池が薄くなり、Ｚｎ蒸気の離脱が促進されてブローホールが抑制される。 A pulse arc welding method has been proposed as a method of suppressing spatter and blowholes in a hot-dip Zn-based plated steel sheet. According to the pulse arc welding method, the droplets are reduced in size and spatter is suppressed. In addition, the molten pool is agitated by the pulse arc and the molten pool is pushed down to make the molten pool thinner, and the release of Zn vapor is promoted to suppress blowholes.
　例えば、特許文献１には溶接ワイヤー組成とパルス電流波形のピーク電流、ピーク時間、ベース電流を適正範囲内に制御してスパッタ、ブローホールを抑制するパルスアーク溶接法が開示されている。 For example, Patent Document 1 discloses a pulse arc welding method in which the welding wire composition, the peak current of the pulse current waveform, the peak time, and the base current are controlled within appropriate ranges to suppress spatter and blowholes.
日本国公開特許公報「特開平９－２０６９８４号公報」Japanese Patent Publication “JP 9-206984 A”
　しかし、特許文献１は片面当たりめっき付着量４５ｇ／ｍ２の薄目付溶融Ｚｎめっき鋼板の実施例が開示されているのみであり、厚目付の溶融Ｚｎ系めっき鋼板のスパッタ、ブローホールの抑制方法については記載されていない。 However, Patent Document 1 only discloses an embodiment of a thin-walled hot-dip Zn-plated steel sheet having a coating adhesion amount of 45 g / m 2 per side, and a method for suppressing spatter and blowholes of a thick-hot-working hot-dip Zn-plated steel sheet. Is not described.
　また、特許文献１は、めっき層中のＡｌ濃度が通常０．３質量％以下の溶融Ｚｎめっき鋼板を溶接対象としている。Ａｌ濃度によってめっき層の融点が異なるため、めっき層中のＡｌ濃度は、溶接時におけるめっき層の挙動に影響する。そのため、特許文献１の技術を、Ａｌ濃度が１質量％以上含む溶融Ｚｎ系めっき鋼板（例えば、溶融Ｚｎ－Ａｌ－Ｍｇ系めっき鋼板）にそのまま適用することができない。 Further, Patent Document 1 targets a welded Zn-plated steel sheet whose Al concentration in the plating layer is usually 0.3% by mass or less. Since the melting point of the plating layer varies depending on the Al concentration, the Al concentration in the plating layer affects the behavior of the plating layer during welding. Therefore, the technique of Patent Document 1 cannot be applied as it is to a hot-dip Zn-based plated steel sheet (for example, hot-melted Zn—Al—Mg-based steel sheet) containing an Al concentration of 1% by mass or more.
　上記のように、Ａｌ濃度が１質量％以上含む溶融Ｚｎ系めっき鋼板は耐食性に優れるが、アーク溶接時にスパッタ、ブローホールが発生して溶接部外観と溶接強度が低下する。本発明はこのような現状に鑑み、溶接部外観と溶接強度に優れた、Ａｌ濃度が１質量％以上含む溶融Ｚｎ系めっき鋼板のアーク溶接方法および溶接部材を提供することを目的とする。 As described above, a hot-dip Zn-based plated steel sheet having an Al concentration of 1% by mass or more is excellent in corrosion resistance, but spatter and blowholes are generated during arc welding, and the welded portion appearance and weld strength are reduced. In view of such a current situation, an object of the present invention is to provide an arc welding method and a welding member for a hot-dip Zn-based plated steel sheet, which has an excellent weld appearance and weld strength and contains an Al concentration of 1% by mass or more.
　発明者らの詳細な研究の結果、Ａｌ濃度が１質量％以上含む溶融Ｚｎ系めっき鋼鈑のアーク溶接においてパルスアーク溶接法を用いて平均溶接電流、平均溶接電圧、パルス周期、めっき層中のＡｌ濃度、めっき付着量を適正範囲内に制御することで、溶接部外観を損なうことなくスパッタとブローホールを抑制できるという知見を得て本発明を完成したものである。 As a result of detailed researches by the inventors, the average welding current, average welding voltage, pulse period, in the plating layer using a pulsed arc welding method in arc welding of a hot-dip Zn-based plated steel sheet containing Al concentration of 1% by mass or more. The present invention has been completed by obtaining the knowledge that sputtering and blowholes can be suppressed without impairing the appearance of the welded part by controlling the Al concentration and the plating adhesion amount within appropriate ranges.
　本発明に係る溶融Ｚｎ系めっき鋼板のアーク溶接方法は、溶融Ｚｎ系めっき鋼板のめっき層の組成が、Ｚｎを主成分とし、質量％でＡｌ：１．０～２２．０％を含有し、めっき付着量Ｗが１５～２５０ｇ／ｍ２で、平均溶接電流が１００～３５０Ａであり、平均溶接電圧が２０～３５Ｖであり、溶接電流の電流波形がピーク電流とベース電流を１～５０ｍｓのパルス周期で繰り返すパルス電流波形であるアーク溶接を行うことによる溶融Ｚｎ系めっき鋼板のアーク溶接方法である。 In the arc welding method for a hot-dip Zn-plated steel sheet according to the present invention, the composition of the plating layer of the hot-dip Zn-plated steel sheet contains Zn as a main component and contains Al: 1.0 to 22.0% by mass, Plating adhesion amount W is 15 to 250 g / m 2 , average welding current is 100 to 350 A, average welding voltage is 20 to 35 V, and the current waveform of the welding current is a pulse with a peak current and a base current of 1 to 50 ms. This is an arc welding method for a hot-dip Zn-based plated steel sheet by performing arc welding, which is a pulse current waveform that repeats periodically.
　本発明によれば、溶融Ｚｎ系めっき鋼板のアーク溶接におけるスパッタとブローホールを抑制でき、溶接部外観と溶接強度および耐食性に優れる溶接部材を提供することができる。 According to the present invention, it is possible to suppress spatter and blowholes in arc welding of a hot-dip Zn-based plated steel sheet, and to provide a welded member that is excellent in appearance, weld strength, and corrosion resistance.
パルス電流波形、パルス電圧波形を模式図的に示した図。The figure which showed the pulse current waveform and the pulse voltage waveform typically. パルスアーク溶接現象を模式図的に示した図。The figure which showed the pulse arc welding phenomenon typically. スパッタ付着個数の測定方法とブローホール占有率の定義を説明する図。The figure explaining the measurement method of a sputter | spatter adhesion number, and the definition of a blowhole occupation rate. 本発明のめっき層中の適正Ａｌ濃度の下限値を示した図。The figure which showed the lower limit of the appropriate Al concentration in the plating layer of this invention. Ｆｅの粘度におよぼす添加元素の影響を示す図。The figure which shows the influence of the additive element on the viscosity of Fe.
　図１にパルスアーク溶接方法における電流波形と電圧波形を模式図的に示す。パルスアーク溶接方法はピーク電流ＩＰとベース電流ＩＢを交互に繰り返すアーク溶接方法で、ピーク電流ＩＰは溶滴がスプレー移行する臨界電流以上に設定される。ピーク電流ＩＰが臨界電流以上では、電磁力によるピンチ効果で溶接ワイヤー先端の溶滴にくびれが生じ、溶滴が小粒化してパルス周期ごとに規則正しい溶滴移行が行われ、スパッタが抑制される。それに対して、ピーク電流ＩＰが臨界電流以下では、溶滴移行が不規則になり、溶滴が大きく成長するので溶融池と短絡してスパッタが発生する。 Fig. 1 schematically shows the current waveform and voltage waveform in the pulse arc welding method. The pulsed arc welding method is an arc welding method in which the peak current IP and the base current IB are alternately repeated, and the peak current IP is set to be equal to or higher than the critical current at which the droplets are sprayed. When the peak current IP is equal to or higher than the critical current, a constriction occurs in the droplet at the tip of the welding wire due to the pinch effect due to electromagnetic force, the droplet is reduced in size, and regular droplet transfer is performed at each pulse period, thereby suppressing spattering. On the other hand, when the peak current IP is equal to or lower than the critical current, the droplet transfer becomes irregular and the droplet grows large, so that the short circuit with the molten pool causes spattering.
　図２にパルスアーク溶接方法における溶接現象を模式図的に示す。パルスアーク溶接では小粒の溶滴５が溶接ワイヤー２から溶融池３にスプレー移行するので短絡が発生せず、スパッタが抑制される。また、パルスアーク４によりアーク直下の溶融池３が押し下げられて薄くなるのでＺｎ蒸気が排出されやすくなり、ブローホールが抑制される。 Fig. 2 schematically shows the welding phenomenon in the pulse arc welding method. In the pulse arc welding, since the small droplets 5 are transferred from the welding wire 2 to the molten pool 3, a short circuit does not occur and spattering is suppressed. Moreover, since the molten pool 3 directly under the arc is pushed down by the pulse arc 4 and becomes thin, Zn vapor is easily discharged, and blow holes are suppressed.
　しかし、めっき付着量が多い厚目付材になるとＺｎ蒸気の発生量が多くなるため、パルスアーク溶接方法でも溶融池からＺｎ蒸気が抜けきらず溶融池内に滞留してブローホールが発生しやすくなる。また、溶融池内に滞留したＺｎ蒸気が一気に噴出してアークが乱れてスパッタが発生しやすくなる。そこで、本発明では平均溶接電流、平均溶接電圧、パルス周期を適正範囲内に制御するとともに、めっき付着量およびめっき層のＡｌ濃度を適正に管理することにより溶融池の粘性を下げてＺｎ蒸気の排出を促進してスパッタ、ブローホールを抑制する。 However, when a thick coating material with a large amount of plating is deposited, the amount of Zn vapor generated increases, so that the Zn vapor does not escape from the molten pool even in the pulse arc welding method, and it tends to stay in the molten pool and easily generate blow holes. Further, Zn vapor staying in the molten pool is ejected all at once, the arc is disturbed, and sputtering is likely to occur. Therefore, in the present invention, the average welding current, the average welding voltage, and the pulse period are controlled within an appropriate range, and the viscosity of the molten pool is reduced by appropriately managing the plating adhesion amount and the Al concentration of the plating layer, thereby reducing the amount of Zn vapor. Discharge is promoted to suppress spatter and blowholes.
　めっき層のＭｇ濃度を３質量％と一定にし、Ａｌ濃度を１～２２質量％と変化させた片面当りのめっき付着量１５～２５０ｇ／ｍ２の溶融Ｚｎ系めっき鋼板サンプルを実験室的に作製した。なお、サンプルサイズは板厚３．２ｍｍ、幅１００ｍｍ、長さ２００ｍｍとした。このサンプルを重ね代３０ｍｍ、溶接ビード長さＬ＝１８０ｍｍで重ね隅肉溶接した。ここでは、平均溶接電流を１００～３５０Ａ、平均溶接電圧を２０～３５Ｖ、パルス周期を１～５０ｍｓの範囲で適宜設定し、パルスアーク溶接を行うことで、溶融Ｚｎ系めっき鋼板同士が接合された溶接部材を製造した。アーク溶接部のＸ線透過写真を撮影し、図３に模式図的に示すように、溶接ビード６の長手方向に沿ったブローホールの長さｄ１～ｄｉを測定して、その積算値Σｄｉ（ｍｍ）を求め、（２）式からブローホール占有率Ｂｒを算出した。また、図３の点線で示す溶接ビード６を中心とした幅１００ｍｍ、長さ１００ｍｍの領域７のスパッタ付着個数を目視で計測した。領域７は、溶接ビード６の長手方向に平行であり、その中央に溶接ビード６が位置する２辺と、溶接ビード６の長手方向に垂直な２辺で囲まれた、１辺の長さが１００ｍｍの正方形の領域である。
Ｂｒ＝（Σｄｉ／Ｌ）×１００　…　（２）。 Laboratory production of hot-dip Zn-based plated steel sheet samples with 15 to 250 g / m 2 plating coverage per side with the Mg concentration of the plating layer kept constant at 3% by mass and the Al concentration varied from 1 to 22% by mass did. The sample size was 3.2 mm thick, 100 mm wide, and 200 mm long. This sample was lap fillet welded with an overlap margin of 30 mm and a weld bead length L = 180 mm. Here, an average welding current of 100 to 350 A, an average welding voltage of 20 to 35 V, a pulse period of 1 to 50 ms are set as appropriate, and pulse arc welding is performed to join the molten Zn-based plated steel sheets together. A welded member was produced. Taking an X-ray radiograph of the arc welding unit, as schematically shown diagrammatically in Figure 3, to measure the length d 1 ~ d i of blowholes in the longitudinal direction of the weld bead 6, the integrated value Σdi (mm) was obtained, and the blowhole occupation rate Br was calculated from the equation (2). Further, the number of sputter adhesions in the region 7 having a width of 100 mm and a length of 100 mm centered on the weld bead 6 indicated by a dotted line in FIG. 3 was visually measured. The region 7 is parallel to the longitudinal direction of the weld bead 6, and has a length of one side surrounded by two sides where the weld bead 6 is located at the center and two sides perpendicular to the longitudinal direction of the weld bead 6. It is a 100 mm square area.
Br = (Σdi / L) × 100 (2).
　図４にブローホール占有率Ｂｒ、スパッタ付着個数におよぼすめっき層中のＡｌ濃度とめっき付着量の影響を調査した結果を示す。建築用薄板溶接接合部設計・施工マニュアル（建築用薄板溶接接合部設計・施工マニュアル編集委員会）によればブローホール占有率Ｂｒが３０％以下であれば溶接強度に問題ないとされている。また、スパッタ付着個数が２０個以下であればスパッタが目立たず、耐食性への影響も小さい。そこで、図４ではブローホール占有率３０％以下、かつスパッタ付着個数２０個以下を○で、ブローホール占有率が３０％かスパッタ付着量が２０個の少なくともどちらかを越える場合を●でプロットした。図４の４本の直線で囲まれた領域内ではブローホール占有率Ｂｒが３０％以下、かつスパッタ付着個数が２０個以下であり、めっき付着量およびＡｌ濃度を適切に管理することによりスパッタとブローホールを抑制することができることがわかる。 FIG. 4 shows the results of investigating the influence of the Al concentration in the plating layer and the amount of plating applied on the blow hole occupancy Br and the number of sputters attached. According to the architectural thin plate welded joint design and construction manual (architecture thin plate welded joint design and construction manual editorial committee), if the blowhole occupancy Br is 30% or less, there is no problem in welding strength. Further, if the number of sputters deposited is 20 or less, the spatter is not noticeable and the influence on the corrosion resistance is small. Therefore, in FIG. 4, the case where the blowhole occupancy is 30% or less and the number of sputter deposits of 20 or less is indicated by ○, and the case where the blowhole occupancy exceeds 30% or the amount of sputter adherence exceeds 20 is plotted by ● . In the region surrounded by the four straight lines in FIG. 4, the blow hole occupancy Br is 30% or less and the number of sputter depositions is 20 or less. It can be seen that blowholes can be suppressed.
　すなわち、図４に示されるように、Ａｌ濃度を１～２２質量％含むめっき層を片面当りのめっき付着量１５～２５０ｇ／ｍ２有する溶融Ｚｎ系めっき鋼板を、平均溶接電流を１００～３５０Ａ、平均溶接電圧を２０～３５Ｖ、パルス周期を１～５０ｍｓの範囲で適宜設定したうえでパルスアーク溶接することにより、スパッタとブローホールを抑制することができる。 That is, as shown in FIG. 4, a hot dip Zn-based plated steel sheet having a plating layer containing an Al concentration of 1 to 22% by mass and having a plating adhesion amount of 15 to 250 g / m 2 per side, an average welding current of 100 to 350 A, Sputtering and blowholes can be suppressed by performing pulse arc welding after appropriately setting the average welding voltage in the range of 20 to 35 V and the pulse period in the range of 1 to 50 ms.
　なお、図４において、めっき層中のＡｌ濃度ＣＡｌ（質量％）とめっき付着量Ｗ（ｇ／ｍ２）とが、ＣＡｌ＜０．００８５Ｗ＋０．８７を満たす範囲において、ブローホール占有率が３０％かスパッタ付着量が２０個の少なくともどちらかを越えることが示されているが、平均溶接電流、平均溶接電圧、パルス周期以外のパルスアーク溶接条件を適宜調整することにより、ブローホール占有率３０％以下、かつスパッタ付着個数２０個以下に抑制することができる。すなわち、めっき付着量１５～２５０ｇ／ｍ２において、ブローホール占有率３０％以下、かつスパッタ付着個数２０個以下に抑制するために、ＣＡｌ＜０．００８５Ｗ＋０．８７の範囲では、平均溶接電流、平均溶接電圧、パルス周期に加えて、これら以外の溶接速度、シールドガス組成の調整が必要であるが、０．００８５Ｗ＋０．８７≦ＣＡｌの範囲では、平均溶接電流、平均溶接電圧、パルス周期の調整でよい。そのため、ブローホール占有率３０％以下、かつスパッタ付着個数２０個以下に抑制するためには、０．００８５Ｗ＋０．８７≦ＣＡｌの範囲であることが好ましい。 In FIG. 4, the blowhole occupancy is within a range where the Al concentration C Al (mass%) in the plating layer and the plating adhesion amount W (g / m 2 ) satisfy C Al <0.0085W + 0.87. It has been shown that the amount of spatter deposition exceeds 30% or 20 spatter deposits. By appropriately adjusting the pulse arc welding conditions other than the average welding current, average welding voltage, and pulse period, the blowhole occupancy rate It can be suppressed to 30% or less and the number of sputtered deposits to 20 or less. That is, in order to suppress the blow hole occupancy ratio to 30% or less and the number of sputter deposits to 20 or less at a plating adhesion amount of 15 to 250 g / m 2 , the average welding current in the range of C Al <0.0085 W + 0.87 In addition to the average welding voltage and pulse period, adjustment of the welding speed and shield gas composition other than these is necessary, but in the range of 0.0085W + 0.87 ≦ C Al , the average welding current, average welding voltage, and pulse period Adjustment is sufficient. Therefore, in order to suppress the blow hole occupation ratio to 30% or less and the number of sputtered deposits to 20 or less, it is preferable that the range is 0.0085W + 0.87 ≦ C Al .
　以下に本発明のパルスアーク溶接条件を詳述する。 Hereinafter, the pulse arc welding conditions of the present invention will be described in detail.
　〔平均溶接電流〕
　本発明では、図１に示すように電流波形がピーク電流とベース電流を繰り返すパルス波形であって、平均溶接電流ＩＡを１００～３５０Ａの範囲とすることが好ましい。本発明で、平均溶接電流ＩＡは下記（３）式とする。
ＩＡ＝（（ＩＰ×ＴＩＰ）＋（ＩＢ×ＴＩＢ））／（ＴＩＰ＋ＴＩＢ）…（３）
ここで、
　ＩＰ：ピーク電流（Ａ）
　ＩＢ：ベース電流（Ａ）
　ＴＩＰ：ピーク電流期間（ｍｓ）
　ＴＩＢ：ベース電流期間（ｍｓ）
　平均溶接電流が１００Ａ未満では入熱不足で溶融池の温度が下がって粘度が高くなり、Ｚｎ蒸気が排出されにくくなって溶融池内にＺｎ蒸気が残存してブローホールが発生する。溶接電流は溶接ワイヤーの送給量とリンクしており、必要以上に溶接電流を大きくすると溶滴が粗大化し、溶融池と短絡してスパッタが発生するので３５０Ａ以下が好ましい。 [Average welding current]
In the present invention, as shown in FIG. 1, the current waveform is a pulse waveform that repeats the peak current and the base current, and the average welding current IA is preferably in the range of 100 to 350A. In the present invention, the average welding current IA is represented by the following formula (3).
IA = ((IP × TIP) + (IB × TIB)) / (TIP + TIB) (3)
here,
IP: Peak current (A)
IB: Base current (A)
TIP: Peak current period (ms)
TIB: Base current period (ms)
If the average welding current is less than 100 A, heat input is insufficient, the temperature of the molten pool decreases, the viscosity increases, Zn vapor is difficult to be discharged, Zn vapor remains in the molten pool, and blowholes are generated. The welding current is linked to the feed amount of the welding wire, and if the welding current is increased more than necessary, the droplets become coarse and short-circuit with the molten pool to cause spattering.
　〔平均溶接電圧〕
　本発明では、平均溶接電圧ＥＡを２０～３５Ｖの範囲とすることが好ましい。本発明で、平均溶接電圧ＥＡは下記（４）式とする。
ＥＡ＝（（ＥＰ×ＴＥＰ）＋（ＥＢ×ＴＥＢ））／（ＴＥＰ＋ＴＥＢ）…（４）
ここで、
　ＥＰ：ピーク電圧（Ｖ）
　ＥＢ：ベース電圧（Ｖ）
　ＴＥＰ：ピーク電圧期間（ｍｓ）
　ＴＥＢ：ベース電圧期間（ｍｓ）
　平均溶接電圧ＥＡが２０Ｖ未満ではアーク長が短くなって溶滴と溶融池が短絡してスパッタが発生する。平均溶接電圧が３５Ｖを超えると入熱過多で溶け落ちが発生する。 [Average welding voltage]
In the present invention, the average welding voltage EA is preferably in the range of 20 to 35V. In the present invention, the average welding voltage EA is expressed by the following equation (4).
EA = ((EP × TEP) + (EB × TEB)) / (TEP + TEB) (4)
here,
EP: Peak voltage (V)
EB: Base voltage (V)
TEP: Peak voltage period (ms)
TEB: Base voltage period (ms)
When the average welding voltage EA is less than 20V, the arc length becomes short, the droplet and the molten pool are short-circuited, and spatter is generated. If the average welding voltage exceeds 35V, it will burn out due to excessive heat input.
　〔パルス周期〕
　パルス周期ＰＦは１～５０ｍｓの範囲とする。１ｍｓ未満では溶滴移行が不安定になり、スパッタが発生する。一方、５０ｍｓを超えるとアークが発生していない期間が長くなりすぎて溶融池の押し下げ効果が弱くなり、Ｚｎ蒸気が排出されにくくなってスパッタ、ブローホールが発生する。 [Pulse period]
The pulse period PF is in the range of 1 to 50 ms. If it is less than 1 ms, droplet transfer becomes unstable and spatter occurs. On the other hand, if it exceeds 50 ms, the period during which no arc is generated becomes too long, and the effect of depressing the molten pool becomes weak, and Zn vapor is hardly discharged, resulting in spatter and blowholes.
　〔溶接速度〕
　本発明で溶接速度は特に限定されない。溶融Ｚｎ系めっき鋼板の板厚によって適宜選択される。 [Welding speed]
In the present invention, the welding speed is not particularly limited. It selects suitably by the plate | board thickness of a hot-dip Zn type plated steel plate.
　〔シールドガス〕
　パルスアーク溶接法では溶滴をスプレー移行させるためにＡｒ－ＣＯ２混合ガスが用いられる。本発明でもシールドガスは、Ａｒ－ＣＯ２混合ガスを用いる。Ａｒ－３０体積％ＣＯ２ガスやＡｒ－２０体積％ＣＯ２ガス、あるいはさらにＣＯ２濃度を下げたＡｒ－５体積％ＣＯ２ガス等はスパッタ抑制効果が大きいので好適である。 〔Shielding gas〕
In the pulse arc welding method, an Ar—CO 2 mixed gas is used for spray transfer of droplets. Also in the present invention, Ar—CO 2 mixed gas is used as the shielding gas. Ar-30 vol% CO 2 gas, Ar-20 vol% CO 2 gas, or Ar-5 vol% CO 2 gas with a lower CO 2 concentration is preferable because it has a great sputtering suppression effect.
　〔溶融Ｚｎ系めっき鋼板〕　
　本発明に係る溶融Ｚｎ系めっき鋼板はめっき層の組成がＺｎを主成分とし、質量％でＡｌ：１．０～２２．０％を含有し、めっき付着量Ｗが１５～２５０ｇ／ｍ２である。 [Hot Zn-plated steel sheet]
The hot-dip Zn-based plated steel sheet according to the present invention has a plating layer composition containing Zn as a main component, and contains Al: 1.0 to 22.0% by mass, and a plating adhesion W is 15 to 250 g / m 2 . is there.
　また、めっき付着量Ｗとめっき層中のＡｌ濃度ＣＡｌが下記（１）式の関係を満足することが好ましい。 Moreover, it is preferable that the plating adhesion amount W and the Al concentration C Al in the plating layer satisfy the relationship of the following formula (1).
　　０．００８５Ｗ＋０．８７≦ＣＡｌ≦２２　…（１）
　ここで、
　　　Ｗ：めっき付着量（ｇ／ｍ２）
　　　ＣＡｌ:めっき層中のＡｌ濃度（質量％）。 0.0085W + 0.87 ≦ C Al ≦ 22 (1)
here,
W: Plating adhesion amount (g / m 2 )
C Al : Al concentration (mass%) in the plating layer.
　前記溶融Ｚｎ系めっき鋼板のめっき層は更に質量％で、Ｍｇ：０．０５～１０．０％、Ｔｉ：０．００２～０．１０％、Ｂ：０．００１～０．０５％、Ｓｉ：０～２．０％、Ｆｅ：０～２．５％からなる群から選ばれる１あるいは２以上を含有することができる。 The plated layer of the hot-dip Zn-plated steel sheet is further mass%, Mg: 0.05 to 10.0%, Ti: 0.002 to 0.10%, B: 0.001 to 0.05%, Si: One or two or more selected from the group consisting of 0 to 2.0% and Fe: 0 to 2.5% can be contained.
　溶融めっきの方法は特に限定されないが、一般的にはインライン焼鈍型の溶融めっき設備を使用することがコスト的に有利となる。めっき層組成は溶融めっき浴組成をほぼ反映したものとなる。以下、めっき層の成分元素について説明する。めっき層成分元素の「％」は特に断らない限り「質量％」を意味する。 The method of hot dip plating is not particularly limited, but generally it is advantageous in terms of cost to use an in-line annealing type hot dip plating facility. The plating layer composition substantially reflects the hot-dip plating bath composition. Hereinafter, the component elements of the plating layer will be described. “%” Of the plating layer component element means “mass%” unless otherwise specified.
　Ａｌは、めっき鋼板の耐食性向上に有効であり、また、めっき浴においてＭｇ酸化物系ドロスの発生を抑制する。さらに、図５に示すようにＡｌは微量添加でＦｅの粘度を下げる効果があり、アーク溶接時にめっき層中のＡｌは溶融池に取り込まれて溶融池の粘度を下げてＺｎ蒸気の排出を促進してスパッタ、ブローホールを抑制する。これらの作用を十分に発揮させるためには１.０％以上のＡｌ含有量を確保する必要があり、４.０％以上のＡｌ含有量を確保することがより好ましい。一方、Ａｌ含有量が多くなるとめっき層の下地に脆いＦｅ－Ａｌ合金層が成長しやすくなり、Ｆｅ－Ａｌ合金層の過剰な成長はめっき密着性の低下を招く要因となる。種々検討の結果、Ａｌ含有量は２２.０％以下とすることがより好ましく、１５.０％以下、あるいはさらに１０.０％以下に管理しても構わない。 Al is effective in improving the corrosion resistance of the plated steel sheet and suppresses the generation of Mg oxide dross in the plating bath. Furthermore, as shown in FIG. 5, Al has the effect of lowering the viscosity of Fe when added in a small amount, and during arc welding, Al in the plating layer is taken into the molten pool to lower the viscosity of the molten pool and promote the discharge of Zn vapor. Thus, spatter and blowholes are suppressed. In order to fully exhibit these actions, it is necessary to secure an Al content of 1.0% or more, and it is more preferable to secure an Al content of 4.0% or more. On the other hand, when the Al content increases, a brittle Fe—Al alloy layer is likely to grow on the base of the plating layer, and excessive growth of the Fe—Al alloy layer causes a decrease in plating adhesion. As a result of various studies, the Al content is more preferably 22.0% or less, and may be controlled to 15.0% or less, or even 10.0% or less.
　Ｍｇは、めっき層表面に均一な腐食生成物を生成させてめっき鋼板の耐食性を著しく高める作用を呈する。Ｍｇ含有量は０.０５％以上とすることがより効果的であり、１.０％以上とすることがさらに好ましい。一方、めっき浴中のＭｇ含有量が多くなるとＭｇ酸化物系ドロスが発生し易くなり、めっき層の品質低下を招く要因となるのでＭｇ含有量は１０.０％以下の範囲とする。また、Ｍｇは沸点が約１０９１℃とＦｅの融点よりも低く、Ｚｎと同様にアーク溶接時に蒸発してスパッタ、ブローホールの原因になると考えられるのでＭｇ含有量は１０．０％以下が望ましい。 Mg exhibits the effect of significantly increasing the corrosion resistance of the plated steel sheet by generating a uniform corrosion product on the surface of the plated layer. The Mg content is more preferably 0.05% or more, and more preferably 1.0% or more. On the other hand, if the Mg content in the plating bath increases, Mg oxide-based dross is likely to occur, which causes a deterioration in the quality of the plating layer, so the Mg content is set to a range of 10.0% or less. Further, Mg has a boiling point of about 1091 ° C., which is lower than the melting point of Fe, and, like Zn, is considered to evaporate during arc welding and cause spatter and blowholes. Therefore, the Mg content is preferably 10.0% or less.
　溶融めっき浴中にＴｉを含有させると、めっき層外観と耐食性を低下させる原因となるＺｎ１１Ｍｇ２系相の生成、成長が抑制されるので好適である。Ｔｉ添加量が０．００２％未満では抑制効果が不十分で、０．１％を越えるとめっき時にＴｉ－Ａｌ系の析出物の生成、成長に起因しためっき層表面の外観不良を引き起こす要因となる。このため、本発明ではＴｉ添加量を０．００２～０．１％に限定する。 When Ti is contained in the hot dipping bath, it is preferable because generation and growth of a Zn 11 Mg 2 phase that causes deterioration of the plating layer appearance and corrosion resistance are suppressed. If the amount of Ti added is less than 0.002%, the suppression effect is insufficient, and if it exceeds 0.1%, the appearance of the plating layer surface due to the formation and growth of Ti-Al-based precipitates during plating Become. Therefore, in the present invention, the amount of Ti added is limited to 0.002 to 0.1%.
　ＢもＴｉと同様にＺｎ１１Ｍｇ２系相の生成、成長を抑制する効果を有する。Ｂの場合、添加量を０.００１％以上とすることがより効果的である。ただし、Ｂも過剰添加するとＴｉ－ＢあるいはＡｌ－Ｂ系の析出物に起因しためっき層表面の外観不良を引き起こすのでＢ：０.０５％以下の範囲とすることが望ましい。 B, like Ti, has the effect of suppressing the formation and growth of Zn 11 Mg 2 phase. In the case of B, it is more effective to make the addition amount 0.001% or more. However, excessive addition of B causes poor appearance of the plating layer surface due to Ti-B or Al-B-based precipitates, so it is desirable that B is in the range of 0.05% or less.
　溶融めっき浴中にＳｉを含有させると、めっき原板表面とめっき層の界面に生成するＦｅ－Ａｌ合金層の過剰な成長が抑制され、溶融Ｚｎ－Ａｌ－Ｍｇ系めっき鋼板の加工性を向上させる上で有利となる。したがって、必要に応じてＳｉを含有させることができる。その場合、Ｓｉ含有量を０.００５％以上とすることがより効果的である。ただし、過剰のＳｉ含有は溶融めっき浴中のドロス量を増大させる要因となるので、Ｓｉ含有量は２.０％以下とすることが望ましい。 When Si is contained in the hot dipping bath, excessive growth of the Fe—Al alloy layer formed at the interface between the plating original plate surface and the plating layer is suppressed, and the workability of the hot-dip Zn—Al—Mg plated steel sheet is improved. This is advantageous. Therefore, Si can be contained as necessary. In that case, it is more effective to set the Si content to 0.005% or more. However, since excessive Si content causes an increase in the dross amount in the hot dipping bath, the Si content is preferably 2.0% or less.
　溶融めっき浴中には、鋼板を浸漬・通過させる関係上、Ｆｅが混入しやすい。Ｚｎ－Ａｌ－Ｍｇ系めっき層中にＦｅが混入すると耐食性が低下するのでＦｅ含有量は２.５％以下とすることが好ましい。 In the hot dipping bath, Fe is likely to be mixed because the steel sheet is immersed and passed. When Fe is mixed in the Zn—Al—Mg plating layer, the corrosion resistance is lowered, so the Fe content is preferably 2.5% or less.
　〔めっき付着量〕
　溶融Ｚｎ－Ａｌ－Ｍｇ系めっき鋼板のめっき付着量が少ないと、めっき面の耐食性および犠牲防食作用を長期にわたって維持するうえで不利となる。種々検討の結果、片面当たりのめっき付着量は１５ｇ／ｍ２以上とすることがより効果的である。一方、めっき付着量が２５０ｇ／ｍ２を超えるとＺｎ蒸気の発生量が多くなり過ぎ、本発明法でもスパッタ、ブローホールを抑制することが困難になるので上限を２５０ｇ／ｍ２とする。 [Amount of plating]
If the coating amount of the molten Zn—Al—Mg based steel sheet is small, it is disadvantageous for maintaining the corrosion resistance and sacrificial anticorrosive action of the plated surface over a long period of time. As a result of various studies, it is more effective to set the amount of plating deposited on one surface to 15 g / m 2 or more. On the other hand, if the plating adhesion amount exceeds 250 g / m 2 , the generated amount of Zn vapor becomes too large, and it becomes difficult to suppress spatter and blow holes even in the method of the present invention, so the upper limit is set to 250 g / m 2 .
　〔ブローホール占有率、スパッタ付着個数〕
　建築用薄板溶接接合部設計・施工マニュアル（建築用薄板溶接接合部設計・施工マニュアル編集委員会）によれば、図３に模式図的に示すブローホール長さの積算値Σｄｉ（ｍｍ）の測定値から下記（２）式により算出されるブローホール占有率Ｂｒが３０％以下であれば溶接強度に問題ないとされている。本発明の溶接部材は、ブローホール占有率Ｂｒが３０％以下で溶接強度に優れる。 [Blow hole occupancy, number of spatters attached]
According to the Architectural Thin Plate Welded Joint Design and Construction Manual (Architecture of Thin Plate Welded Joint Design and Construction Manual Editorial Committee), measurement of the integrated value Σdi (mm) of blowhole length schematically shown in FIG. If the blow hole occupancy Br calculated by the following equation (2) from the value is 30% or less, there is no problem in the welding strength. The welded member of the present invention is excellent in weld strength when the blowhole occupation ratio Br is 30% or less.
　　Ｂｒ＝（Σｄi／Ｌ）×１００　…（２）
　　　Σｄi：ブローホール長さの積算値（ｍｍ）
　　　Ｌ：溶接ビード長さ（ｍｍ）。 Br = (Σdi / L) × 100 (2)
Σdi: Integrated value of blowhole length (mm)
L: weld bead length (mm).
　図３の点線で示す、溶接ビードを中心とした幅１００ｍｍ、長さ１００ｍｍの領域７のスパッタ付着個数が２０個以下であればスパッタが目立たず、耐食性への影響も小さい。本発明の溶接部材はスパッタ付着個数が２０個以下で溶接部外観と耐食性に優れる。 3 If the number of sputter deposits in the region 7 having a width of 100 mm and a length of 100 mm centered on the weld bead as indicated by the dotted line in FIG. 3 is 20 or less, the spatter is not noticeable and the influence on the corrosion resistance is small. The welded member of the present invention has a sputter adhesion number of 20 or less, and is excellent in welded portion appearance and corrosion resistance.
　以上のように、本実施の形態に係る溶融Ｚｎ系めっき鋼板のアーク溶接方法は、溶融Ｚｎ系めっき鋼板のめっき層の組成が、Ｚｎを主成分とし、質量％でＡｌ：１．０～２２．０％を含有し、めっき付着量Ｗが１５～２５０ｇ／ｍ２で、平均溶接電流が１００～３５０Ａであり、平均溶接電圧が２０～３５Ｖであり、溶接電流の電流波形がピーク電流とベース電流を１～５０ｍｓのパルス周期で繰り返すパルス電流波形であるアーク溶接を行うことによる溶融Ｚｎ系めっき鋼板のアーク溶接方法である。 As described above, in the arc welding method for a hot-dip Zn-based plated steel sheet according to the present embodiment, the composition of the plating layer of the hot-dip Zn-plated steel sheet is mainly composed of Zn and is Al: 1.0-22 by mass%. 0.0%, with a coating weight W of 15 to 250 g / m 2 , an average welding current of 100 to 350 A, an average welding voltage of 20 to 35 V, and a current waveform of the welding current corresponding to the peak current and the base current This is an arc welding method for a hot-dip Zn-based plated steel sheet by performing arc welding, which is a pulse current waveform in which current is repeated at a pulse period of 1 to 50 ms.
　また、本実施の形態に係る溶融Ｚｎ系めっき鋼板のアーク溶接方法は、前記溶融Ｚｎ系めっき鋼板のめっき付着量Ｗ（ｇ／ｍ２）とめっき層中のＡｌ濃度ＣＡｌ（質量％）が下記（１）式
　　０．００８５Ｗ＋０．８７≦ＣＡｌ≦２２　…（１）
の関係を満足することが好ましい。 Moreover, the arc welding method of the hot-dip Zn-based plated steel sheet according to the present embodiment is such that the coating weight W (g / m 2 ) of the hot-dip Zn-plated steel sheet and the Al concentration C Al (mass%) in the plated layer are Formula (1) below 0.0085W + 0.87 ≦ C Al ≦ 22 (1)
It is preferable to satisfy this relationship.
　また、本実施の形態に係る溶融Ｚｎ系めっき鋼板のアーク溶接方法は、前記溶融Ｚｎ系めっき鋼板のめっき層が更に質量％で、Ｍｇ：０．０５～１０．０％、Ｔｉ：０．００２～０．１０％、Ｂ：０．００１～０．０５％、Ｓｉ：０～２．０％、Ｆｅ：０～２．５％からなる群から選ばれる１あるいは２種以上を含有することができる。 Further, in the arc welding method of the hot-dip Zn-plated steel sheet according to the present embodiment, the plating layer of the hot-dip Zn-plated steel sheet is further mass%, Mg: 0.05 to 10.0%, Ti: 0.002 Or 0.10%, B: 0.001 to 0.05%, Si: 0 to 2.0%, Fe: 1 to 2 or more selected from the group consisting of 0 to 2.5% it can.
　さらに、本実施の形態に係る溶融Ｚｎ系めっき鋼板のアーク溶接方法は、下記（２）式で示されるブローホール占有率Ｂｒが３０％以下となり、かつ溶接ビードを中心とした縦１００ｍｍ、横１００ｍｍの領域のスパッタ付着個数が２０個以下となるようにアーク溶接する溶融Ｚｎ系めっき鋼板のアーク溶接方法である。 Furthermore, in the arc welding method of the hot-dip Zn-based plated steel sheet according to the present embodiment, the blowhole occupancy ratio Br shown by the following formula (2) is 30% or less, and the length is 100 mm and the width is 100 mm centering on the weld bead. This is an arc welding method for a hot-dip Zn-based plated steel sheet, which is arc-welded so that the number of sputters deposited in this region is 20 or less.
　　Ｂｒ＝（Σｄi／Ｌ）×１００　…（２）
　ここで、
　ｄi：観察されたｉ番目のブローホールの長さ
　 Ｌ：溶接ビード長さ、である。 Br = (Σdi / L) × 100 (2)
here,
di: observed i-th blowhole length L: weld bead length.
　また、本実施の形態に係る溶接部材の製造方法は、めっき層の組成が、Ｚｎを主成分とし、質量％でＡｌ：１．０～２２．０％を含有する溶融Ｚｎ系めっき鋼板同士をアーク溶接により接合する、溶接部材の製造方法であって、前記溶融Ｚｎ系めっき鋼板の片面あたりの付着量Ｗが１５～２５０ｇ／ｍ２であり、平均溶接電流が１００～３５０Ａであり、平均溶接電圧が２０～３５Ｖであり、溶接電流の電流波形がピーク電流とベース電流を１～５０ｍｓのパルス周期で繰り返すパルス電流波形であるアーク溶接を前記溶融Ｚｎ系めっき鋼板同士に行う製造方法である。 Further, in the method for manufacturing a welded member according to the present embodiment, hot-dip Zn-based plated steel sheets in which the composition of the plating layer is mainly composed of Zn and contains Al: 1.0 to 22.0% by mass%. A method for producing a welded member joined by arc welding, wherein the adhesion amount W per side of the hot-dip Zn-based plated steel sheet is 15 to 250 g / m 2 , the average welding current is 100 to 350 A, and the average welding This is a manufacturing method in which arc welding, in which the voltage is 20 to 35 V and the current waveform of the welding current is a pulse current waveform in which the peak current and the base current are repeated at a pulse period of 1 to 50 ms, is performed between the hot-dip Zn-based plated steel sheets.
　また、本実施の形態に係る本発明の溶接部材は、めっき層の組成が、Ｚｎを主成分とし、質量％でＡｌ：１．０～２２．０％を含有する溶融Ｚｎ系めっき鋼板同士が溶接されてなる溶接部材であって、前記溶融Ｚｎ系めっき鋼板の片面あたりの付着量Ｗが１５～２５０ｇ／ｍ２であり、ブローホール含有率Ｂｒが３０％以内であり、かつ溶接ビードを中心とした縦１００ｍｍ、横１００ｍｍの領域のスパッタ付着個数が２０個以下で溶接部外観と耐食性に優れる。 Further, in the welded member of the present invention according to the present embodiment, the composition of the plating layer is composed of Zn as a main component, and hot-dip Zn-based plated steel sheets containing Al: 1.0 to 22.0% by mass% are made of each other. A welded member formed by welding, wherein the adhesion amount W per side of the hot-dip Zn-based plated steel sheet is 15 to 250 g / m 2 , the blowhole content Br is within 30%, and the weld bead is the center The sputter adhesion number in the region of 100 mm in length and 100 mm in width is 20 or less, and the welded portion appearance and corrosion resistance are excellent.
　板厚３.２ｍｍ、板幅１０００ｍｍの冷延鋼帯をめっき原板とし、これを溶融めっきラインに通板して溶融Ｚｎ－Ａｌ－Ｍｇ系めっき鋼板を製造した。 A cold rolled steel strip having a plate thickness of 3.2 mm and a plate width of 1000 mm was used as a plating original plate, and this was passed through a hot dipping line to produce a hot-dip Zn—Al—Mg plated steel plate.
　上記めっき鋼板から幅１００ｍｍ、長さ２００ｍｍのサンプルを切り出し、重ね隅肉溶接継手でパルスアーク溶接を行った。ソリッドワイヤーにはＪＩＳ　Ｚ３３１２ ＹＧＷ１２を用い、溶接速度０．４ｍ／ｍｉｎ、ビード長さは１８０ｍｍ、重ね代は３０ｍｍとした。その他の溶接条件を表１、２に示す。パルスアーク溶接後、Ｘ線透過写真を撮影し、前述の方法でブローホール占有率Ｂｒを測定した。また、目視によりスパッタ付着個数を測定した。 A sample having a width of 100 mm and a length of 200 mm was cut out from the plated steel sheet, and pulsed arc welding was performed with a lap fillet welded joint. As the solid wire, JIS Z3312 YGW12 was used, the welding speed was 0.4 m / min, the bead length was 180 mm, and the overlap margin was 30 mm. Other welding conditions are shown in Tables 1 and 2. After the pulse arc welding, an X-ray transmission photograph was taken, and the blow hole occupation ratio Br was measured by the method described above. Moreover, the number of spatter adhesion was measured visually.
　表１に、本発明によるパルスアーク溶接の実施例を示す。また、表２に、めっき層中のＡｌ濃度ＣＡｌ（質量％）とめっき付着量Ｗ（ｇ／ｍ２）とがＣＡｌ＜０．００８５Ｗ＋０．８７の範囲である参考例と、めっき層中のＡｌ濃度が本発明の条件範囲外でパルスアーク溶接した比較例とを示す。 Table 1 shows examples of pulse arc welding according to the present invention. Table 2 shows a reference example in which the Al concentration C Al (mass%) in the plating layer and the plating adhesion amount W (g / m 2 ) are in the range of C Al <0.0085W + 0.87, and in the plating layer A comparative example in which pulsed arc welding is performed with an Al concentration outside the range of the present invention is shown.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表１のＮｏ．１～３０に示すように、パルスアーク溶接条件、めっき層中のＡｌ濃度が本発明の範囲内の実施例では、ブローホール占有率は３０％以下、スパッタ付着個数は２０以下であった。本実施例から、本発明により溶接部外観と耐食性および溶接強度に優れた溶融Ｚｎ－Ａｌ－Ｍｇ系めっき鋼鈑アーク溶接部材が得られることがわかる。 No. in Table 1. As shown in 1 to 30, in the examples in which the pulse arc welding conditions and the Al concentration in the plating layer are within the range of the present invention, the blowhole occupancy was 30% or less and the number of sputters deposited was 20 or less. From this example, it can be seen that the present invention can provide a hot-dip Zn—Al—Mg-based plated steel-iron-welded member with excellent weld appearance, corrosion resistance, and weld strength.
　表２のＮｏ．３１～３４に示される、めっき層中のＡｌ濃度ＣＡｌ（質量％）とめっき付着量Ｗ（ｇ／ｍ２）とがＣＡｌ＜０．００８５Ｗ＋０．８７の範囲である参考例では、スパッタおよびブローホールの発生が見られた。ただし、ＣＡｌ＜０．００８５Ｗ＋０．８７を満たす範囲では、平均溶接電流、平均溶接電圧、パルス周期以外のパルスアーク溶接条件を適宜調整することにより、ブローホール占有率３０％以下、かつスパッタ付着個数２０個以下に抑制することができる。 No. in Table 2 In the reference examples shown in 31 to 34, in which the Al concentration C Al (mass%) in the plating layer and the plating adhesion amount W (g / m 2 ) are in the range of C Al <0.0085W + 0.87, sputtering and The occurrence of blowholes was observed. However, in the range satisfying C Al <0.0085W + 0.87, by appropriately adjusting the pulse arc welding conditions other than the average welding current, average welding voltage, and pulse period, the blow hole occupancy is 30% or less and the number of spatters deposited It can be suppressed to 20 or less.
　これに対し、Ｎｏ．３５～３９の平均溶接電流、平均溶接電圧、パルス周期が本発明の範囲外の比較例ではスパッタ、ブローホールが著しく発生した。また、Ｎｏ．４０のめっき付着量が本発明の範囲を超える比較例でもスパッタ、ブローホールが著しく発生した。 On the other hand, No. In the comparative examples in which the average welding current, average welding voltage, and pulse period of 35 to 39 were outside the range of the present invention, spatter and blowholes were remarkably generated. No. Even in the comparative example in which the plating adhesion amount of 40 exceeded the range of the present invention, spatter and blow holes were remarkably generated.
　１、１’　　溶融Ｚｎ系めっき鋼板
　２　　溶接ワイヤー
　３　　溶融池
　４　　パルスアーク
　５　　溶滴
　６　　溶接ビード
　７　　スパッタ個数を数える領域 1, 1 ′ Hot-dip Zn-based plated steel plate 2 Welding wire 3 Weld pool 4 Pulse arc 5 Droplet 6 Weld bead 7 Area for counting the number of spatters

Claims (6)

  1. 　めっき層の組成が、Ｚｎを主成分とし、質量％でＡｌ：１．０～２２．０％を含有する溶融Ｚｎ系めっき鋼板同士を接合する溶融Ｚｎ系めっき鋼板のアーク溶接方法であって、
    　前記溶融Ｚｎ系めっき鋼板の片面あたりの付着量Ｗが１５～２５０ｇ／ｍ２で、
    　平均溶接電流が１００～３５０Ａであり、平均溶接電圧が２０～３５Ｖであり、溶接電流の電流波形がピーク電流とベース電流を１～５０ｍｓのパルス周期で繰り返すパルス電流波形であるアーク溶接を行う溶融Ｚｎ系めっき鋼板のアーク溶接方法。     The composition of the plating layer is an arc welding method of a hot-dip Zn-based plated steel sheet for joining hot-dip Zn-based plated steel sheets containing Zn as a main component and containing Al: 1.0 to 22.0% by mass,
    The adhesion amount W per side of the hot-dip Zn-based plated steel sheet is 15 to 250 g / m 2 ,
    Melting is performed by arc welding in which the average welding current is 100 to 350 A, the average welding voltage is 20 to 35 V, and the current waveform of the welding current is a pulse current waveform in which the peak current and the base current are repeated with a pulse period of 1 to 50 ms. Arc welding method for Zn-based plated steel sheet.
  2. 　前記溶融Ｚｎ系めっき鋼板のめっき付着量Ｗ（ｇ／ｍ２）とめっき層中のＡｌ濃度ＣＡｌ（質量％）が下記（１）式の関係を満足することを特徴とする、請求項１に記載の溶融Ｚｎ系めっき鋼板のアーク溶接方法。
    　　０．００８５Ｗ＋０．８７≦ＣＡｌ≦２２　…（１）     The plating adhesion amount W (g / m 2 ) of the hot-dip Zn-based plated steel sheet and the Al concentration C Al (mass%) in the plating layer satisfy the relationship of the following formula (1): An arc welding method for a hot-dip Zn-based plated steel sheet as described in 1.
    0.0085W + 0.87 ≦ C Al ≦ 22 (1)
  3. 　前記溶融Ｚｎ系めっき鋼板のめっき層の組成が、さらに質量％でＭｇ：０．０５～１０．０％、Ｔｉ：０．００２～０．１０％、Ｂ：０．００１～０．０５％、Ｓｉ：０～２．０％、Ｆｅ：０～２．５％からなる群から選ばれる１あるいは２以上を含有する、請求項１または２に記載の溶融Ｚｎ系めっき鋼板のアーク溶接方法。 The composition of the plated layer of the hot-dip Zn-plated steel sheet is further Mg: 0.05 to 10.0%, Ti: 0.002 to 0.10%, B: 0.001 to 0.05% in terms of mass%, 3. The arc welding method for a hot dip Zn-plated steel sheet according to claim 1, comprising 1 or 2 or more selected from the group consisting of Si: 0 to 2.0% and Fe: 0 to 2.5%.
  4. 　下記（２）式で示されるブローホール占有率Ｂｒが３０％以下となり、
    　かつ溶接ビードを中心とした縦１００ｍｍ、横１００ｍｍの領域のスパッタ付着個数が２０個以下となるようにアーク溶接する、請求項１～３のいずれか１項に記載の溶融Ｚｎ系めっき鋼板のアーク溶接方法。
    　　Ｂｒ＝（Σｄi／Ｌ）×１００　…（２）
    　ここで、
    　　　　ｄi：観察されたｉ番目のブローホールの長さ
    　　　　 Ｌ：溶接ビード長さ     The blow hole occupancy ratio Br shown by the following formula (2) is 30% or less,
    The arc of the hot dip Zn-based plated steel sheet according to any one of claims 1 to 3, wherein arc welding is performed so that the number of spatters in a region of 100 mm length and 100 mm width centering on the weld bead is 20 or less. Welding method.
    Br = (Σdi / L) × 100 (2)
    here,
    di: observed i-th blowhole length L: weld bead length
  5. 　めっき層の組成が、Ｚｎを主成分とし、質量％でＡｌ：１．０～２２．０％を含有する溶融Ｚｎ系めっき鋼板同士をアーク溶接により接合する、溶接部材の製造方法であって、
    　前記溶融Ｚｎ系めっき鋼板の片面あたりの付着量Ｗが１５～２５０ｇ／ｍ２であり、
    　平均溶接電流が１００～３５０Ａであり、平均溶接電圧が２０～３５Ｖであり、溶接電流の電流波形がピーク電流とベース電流を１～５０ｍｓのパルス周期で繰り返すパルス電流波形であるアーク溶接を前記溶融Ｚｎ系めっき鋼板同士に行う、溶接部材の製造方法。     The composition of the plating layer is a method for producing a welded member in which hot-dip Zn-based plated steel sheets containing Zn as a main component and containing Al: 1.0 to 22.0% by mass are joined by arc welding,
    The adhesion amount W per side of the hot-dip Zn-based plated steel sheet is 15 to 250 g / m 2 ,
    Melting arc welding in which the average welding current is 100 to 350 A, the average welding voltage is 20 to 35 V, and the current waveform of the welding current is a pulse current waveform in which the peak current and the base current are repeated with a pulse period of 1 to 50 ms. The manufacturing method of the welding member performed between Zn type plated steel plates.
  6. 　めっき層の組成が、Ｚｎを主成分とし、質量％でＡｌ：１．０～２２．０％を含有する溶融Ｚｎ系めっき鋼板同士が溶接されてなる溶接部材であって、
    　前記溶融Ｚｎ系めっき鋼板の片面あたりの付着量Ｗが１５～２５０ｇ／ｍ２であり、
    　下記（２）式で示されるブローホール占有率Ｂｒが３０％以下であり、
    　かつ溶接ビードを中心とした縦１００ｍｍ、横１００ｍｍの領域のスパッタ付着個数が２０個以下である、溶融Ｚｎ系めっき鋼板の溶接部材。
    　　Ｂｒ＝（Σｄi／Ｌ）×１００　…（２）
    　ここで、
    　　　　ｄi：観察されたｉ番目のブローホールの長さ
    　　　　 Ｌ：溶接ビード長さ     The composition of the plating layer is a welding member formed by welding hot-dip Zn-based plated steel sheets containing Zn as a main component and containing Al: 1.0 to 22.0% by mass,
    The adhesion amount W per side of the hot-dip Zn-based plated steel sheet is 15 to 250 g / m 2 ,
    The blowhole occupation rate Br shown by the following formula (2) is 30% or less,
    A welded member of a hot-dip Zn-based plated steel sheet, in which the number of sputter deposits in a region of 100 mm length and 100 mm width centering on the weld bead is 20 or less.
    Br = (Σdi / L) × 100 (2)
    here,
    di: observed i-th blowhole length L: weld bead length
PCT/JP2016/053048 2015-05-29 2016-02-02 Arc welding method for hot-dip galvanized steel plate having excellent appearance of welded part and high welding strength, method for manufacturing welding member, and welding member WO2016194400A1 (en)

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