JPH11239880A - Arc welding method for galvanized steel sheet - Google Patents

Arc welding method for galvanized steel sheet

Info

Publication number
JPH11239880A
JPH11239880A JP4052198A JP4052198A JPH11239880A JP H11239880 A JPH11239880 A JP H11239880A JP 4052198 A JP4052198 A JP 4052198A JP 4052198 A JP4052198 A JP 4052198A JP H11239880 A JPH11239880 A JP H11239880A
Authority
JP
Japan
Prior art keywords
arc welding
galvanized steel
steel sheet
zinc
gas
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.)
Granted
Application number
JP4052198A
Other languages
Japanese (ja)
Other versions
JP3513382B2 (en
Inventor
Tsuyoshi Kurokawa
剛志 黒川
Fusaki Koshiishi
房樹 輿石
Hajime Uchiyama
肇 内山
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP04052198A priority Critical patent/JP3513382B2/en
Publication of JPH11239880A publication Critical patent/JPH11239880A/en
Application granted granted Critical
Publication of JP3513382B2 publication Critical patent/JP3513382B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Nonmetallic Welding Materials (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a welding method for a galvanized steel plate wherein a fused metal is not blown away by vaporized zinc gas, weld beads having an excellent shape are formed, spatters are hardly generated and gas shielded arc welding having excellent pit resistance is executed even for an object to be welded which consists of a galvanized steel sheet having a large quantity of stuck zinc such as the quantity of stuck zinc of >=300 g/m<2> . SOLUTION: In a method for arc welding a galvanized steel sheet, a quantity of oxygen in a weld metal is specified to <=200 ppm by the use of a gas shielded arc welding flux cored wire wherein flux is filled into a steel made sheath, and the gas shielded arc welding is executed with a DC straight polarity.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、亜鉛付着量が30
0g/m2 以上のような亜鉛付着量の多い亜鉛めっき鋼
板よりなる被溶接物でも、良好な形状の溶接ビードを形
成でき、スパッタ発生量が少なく、また、ピット欠陥の
発生が大幅に少なく耐ピット性に優れたガスシールドア
ーク溶接を行うことができるようにした、亜鉛めっき鋼
板のアーク溶接方法に関するものである。
BACKGROUND OF THE INVENTION The present invention relates to a method for producing a steel sheet having a zinc deposition amount of 30.
Even a work piece made of a galvanized steel sheet having a large zinc adhesion amount such as 0 g / m 2 or more can form a weld bead of a good shape, has a small amount of spatter, and has a significantly reduced generation of pit defects. The present invention relates to an arc welding method for galvanized steel sheet, which can perform gas shielded arc welding with excellent pitting properties.

【0002】[0002]

【従来の技術】防錆処理を施した耐食性に優れた鋼材と
して、表面に亜鉛めっきを施した亜鉛めっき鋼板があ
る。亜鉛めっき鋼板の主な用途は建築材料や自動車車体
などの薄板分野であるが、最近では、耐食性をさらに向
上させるために亜鉛付着量の多い厚目付け材として水道
・ガスの配管材などにも多く使用されるようになってき
ている。
2. Description of the Related Art A galvanized steel sheet whose surface is galvanized is an example of a steel material which has been subjected to rust prevention and has excellent corrosion resistance. The main use of galvanized steel sheet is in the field of thin sheets such as building materials and automobile bodies, but recently, in order to further improve corrosion resistance, it has been used as a thickening material with a large amount of zinc in water and gas piping materials. Is being used.

【0003】このような、亜鉛付着量が例えば300g
/m2 以上のような亜鉛付着量の多い亜鉛めっき鋼板の
アーク溶接を行うと、アーク熱で亜鉛が急激に気化し、
気化した亜鉛ガスによって溶融プールや溶滴などの溶融
金属が吹き飛ばされることにより、スパッタが大量に発
生したり、また、溶接ビードに亜鉛の気化によるピット
(ビード表面に現れた気孔欠陥)が多発したりする。そ
して、スパッタの発生が著しい場合には、溶融金属が大
量に吹き飛ばされて溶接ビードが形成できないようなこ
ともある。
[0003] Such a zinc adhesion amount is, for example, 300 g
Arc welding of galvanized steel sheet with a large amount of zinc adhesion such as / m 2 or more, zinc is rapidly vaporized by arc heat,
Molten metal such as molten pools and droplets is blown off by the vaporized zinc gas, causing a large amount of spatter, and pits (porous defects appearing on the bead surface) due to zinc vaporization in the weld bead. Or If the generation of spatter is remarkable, the molten metal may be blown off in large quantities and a weld bead may not be formed.

【0004】このような亜鉛の害を回避するには、予め
溶接線上から亜鉛を例えばグラインダーによって機械的
に除去することが有効であるものの、このような手段で
は大幅に手間がかかり能率が極めて悪い。そのため、ピ
ット等の溶接欠陥を防止し、また、スパッタの発生を抑
制して溶接作業性を向上させることを目的として、特開
昭61−169196号公報では、外部からシールドガ
スやフラックスを供給することなく溶接を行うセルフシ
ールドアーク溶接用フラックス入りワイヤが提案されて
いる。また特開平6−15484号公報では、スラグ生
成剤、金属チタン又は金属チタンと金属ボロンとの混合
物、及びフッ化物を含有するフラックスを鋼製外皮内に
充填してなるガスシールドアーク溶接フラックス入りワ
イヤが提案されている。しかしながら、これらのワイヤ
を用いた溶接では、亜鉛の害をなくす点において十分で
なかった。
In order to avoid such harm of zinc, it is effective to mechanically remove zinc from the welding line in advance by, for example, a grinder. However, such a method requires much labor and is extremely inefficient. . Therefore, in order to prevent welding defects such as pits and to suppress the generation of spatter to improve welding workability, Japanese Patent Application Laid-Open No. 61-169196 discloses that a shielding gas or flux is supplied from the outside. A flux-cored wire for self-shielded arc welding that performs welding without welding has been proposed. Japanese Patent Application Laid-Open No. 6-15484 discloses a gas-shielded arc welding flux-cored wire obtained by filling a steel sheath with a flux containing a slag forming agent, titanium metal or a mixture of titanium metal and boron, and a fluoride. Has been proposed. However, welding using these wires was not sufficient in eliminating the harm of zinc.

【0005】[0005]

【発明が解決しようとする課題】そこで本発明の目的
は、亜鉛付着量が300g/m2 以上のような亜鉛付着
量の多い亜鉛めっき鋼板よりなる被溶接物でも、気化し
た亜鉛ガスによって溶融金属が吹き飛ばされるようなこ
とがなく、良好な形状の溶接ビードを形成でき、スパッ
タ発生量が少なく、また、ピット欠陥の発生が極めて少
なく耐ピット性に優れたガスシールドアーク溶接を行う
ことができる、亜鉛めっき鋼板のアーク溶接方法を提供
することにある。
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for welding a molten metal made of a galvanized steel sheet having a large zinc deposition amount such as 300 g / m 2 or more by vaporized zinc gas. It is possible to form a weld bead of a good shape without being blown off, to generate a small amount of spatter, and to perform gas shield arc welding with extremely low occurrence of pit defects and excellent pit resistance. An object of the present invention is to provide an arc welding method for a galvanized steel sheet.

【0006】[0006]

【課題を解決するための手段】前記の目的を達成するた
めに、請求項1の発明は、鋼製外皮内にフラックスを充
填してなるガスシールドアーク溶接フラックス入りワイ
ヤを用いて、溶接金属中の酸素量を200ppm以下と
するとともに、直流正極性でガスシールドアーク溶接を
行う亜鉛めっき鋼板のアーク溶接方法である。
Means for Solving the Problems In order to achieve the above object, the invention of claim 1 uses a gas-shielded arc welding flux-cored wire formed by filling a steel sheath with a flux, thereby forming a welded metal in a welding metal. The method is an arc welding method for galvanized steel sheet, in which the oxygen content of the steel is 200 ppm or less and gas shielded arc welding is performed with DC positive polarity.

【0007】請求項2の発明は、前記請求項1の発明に
おいて、亜鉛めっき鋼板はその亜鉛付着量が300g/
2 以上のものである亜鉛めっき鋼板のアーク溶接方法
である。請求項3の発明は、前記請求項1又は2の発明
において、ガスシールドアーク溶接フラックス入りワイ
ヤが、ワイヤ全重量に対する重量%で、Al+3Mg+5Z
r:1.5〜15重量%を満足するものである亜鉛めっ
き鋼板のアーク溶接方法である。請求項4の発明は、前
記請求項1、2又は3の発明において、溶接金属中の窒
素量を150ppm以下とする亜鉛めっき鋼板のアーク
溶接方法である。請求項5の発明は、前記請求項1、
2、3又は4の発明において、溶接金属中のP 量を10
0ppm以上とする亜鉛めっき鋼板のアーク溶接方法で
ある。
According to a second aspect of the present invention, in the first aspect of the invention, the galvanized steel sheet has a zinc adhesion amount of 300 g / g.
This is an arc welding method for galvanized steel sheets having a diameter of not less than m 2 . According to a third aspect of the present invention, in the first or the second aspect of the present invention, the gas-shielded arc welding flux cored wire is Al + 3Mg + 5Z in weight% based on the total weight of the wire.
r: An arc welding method for galvanized steel sheets satisfying 1.5 to 15% by weight. A fourth aspect of the present invention is the arc welding method for a galvanized steel sheet according to the first, second, or third aspect, wherein the amount of nitrogen in the weld metal is 150 ppm or less. The invention according to claim 5 is the invention according to claim 1,
In the invention of 2, 3 or 4, the P content in the weld metal is set at 10
This is an arc welding method for a galvanized steel sheet at 0 ppm or more.

【0008】[0008]

【発明の実施の形態】本願発明による亜鉛めっき鋼板の
アーク溶接方法では、亜鉛付着量が300g/m2 以上
のような亜鉛付着量の多い亜鉛めっき鋼板の溶接におい
ても、良好な形状の溶接ビードを形成できるととも
に、スパッタの発生を少なくできること、また、ピッ
トの発生を極めて少なくできること、について以下のよ
うな手段を講じている。
BEST MODE FOR CARRYING OUT THE INVENTION In the arc welding method for a galvanized steel sheet according to the present invention, a weld bead having a good shape can be obtained even when welding a galvanized steel sheet having a large zinc adhesion amount such as 300 g / m 2 or more. The following measures are taken to reduce the occurrence of spatters and to minimize the occurrence of pits.

【0009】まず、前記に関しては、気化した亜鉛ガ
スによって溶融金属が吹き飛ばされないようにすべく溶
融金属の粘性を高めることに着眼し、フラックス中に強
力な脱酸剤を含有させたガスシールドアーク溶接フラッ
クス入りワイヤを使用し、脱酸剤の効果により溶融金属
中の酸素量を低減させることで粘性を高めるようにして
いる。また、直流正極性(ワイヤを負極、亜鉛めっき鋼
板よりなる被溶接物を正極とする直流のアーク溶接)を
採用することにより、ワイヤ先端で形成されている溶滴
に亜鉛の陽イオンが衝突することで、該溶滴の粘性が高
くその表面張力が大きいものでも、ワイヤ先端から溶滴
が離脱し易く、かつ前記衝突による細かな溶滴が、被溶
接物へとスムーズに移行するので、これによってアーク
の安定化、スパッタ発生量の低減を図るようにしてい
る。なお、一般に、ガスシールドアーク溶接フラックス
入りワイヤを使用する場合には直流逆極性(ワイヤ:正
極、被溶接物:負極)を採用するが、この直流逆極性で
は被溶接物に亜鉛の陽イオンが衝突し、溶融プールが大
きく波立ち乱れることとなる。
[0009] First, with regard to the above, the present invention focuses on increasing the viscosity of the molten metal so as to prevent the molten metal from being blown away by the vaporized zinc gas, and uses gas shielded arc welding in which a strong deoxidizing agent is contained in the flux. A flux-cored wire is used, and the viscosity is increased by reducing the amount of oxygen in the molten metal by the effect of a deoxidizing agent. In addition, by adopting DC positive polarity (DC arc welding using a negative electrode as a wire and a positive electrode as an object to be welded made of galvanized steel plate), zinc cations collide with droplets formed at the wire tip. Thus, even if the droplet has a high viscosity and a high surface tension, the droplet is easily detached from the wire tip, and the fine droplet due to the collision smoothly moves to the workpiece. Thus, the arc is stabilized and the amount of spatter generated is reduced. In general, when a gas-shielded arc welding flux cored wire is used, a DC reverse polarity (wire: positive electrode, work piece: negative electrode) is adopted. In this DC reverse polarity, zinc cations are added to the work piece. The collision causes a large turbulence of the molten pool.

【0010】そして、溶接金属中の酸素量が200pp
m以下となるように脱酸剤を含有させたガスシールドア
ーク溶接フラックス入りワイヤを用いることにより、気
化した亜鉛ガスによって溶融金属が吹き飛ばされるよう
なことがなく、良好な形状の溶接ビードを形成できる。
より好ましくは、溶接金属中の酸素量が150ppm以
下となるようにすることがよい。
[0010] The amount of oxygen in the weld metal is 200 pp.
m or less by using a gas-shielded arc welding flux-cored wire containing a deoxidizing agent so that the molten metal is not blown off by vaporized zinc gas, and a weld bead having a good shape can be formed. .
More preferably, the amount of oxygen in the weld metal should be 150 ppm or less.

【0011】溶融金属の粘性を高めるためには、ガスシ
ールドアーク溶接フラックス入りワイヤとして、ワイヤ
全重量に対する重量%で、Al+3Mg+5Zrの量が1.5
〜15重量%の範囲を満足するものが有効である。Al、
Mg及びZrはともに、強力な脱酸剤で溶融金属の粘性を高
めるとともに、直流正極性でのアークを安定にする効果
がある。しかし、Al+3Mg+5Zrの量が1.5重量%未
満ではそのような効果が十分でなく、一方、15重量%
を超えると溶融金属の粘性が高すぎビードのなじみが悪
く凸ビードとなってビード形状が悪化する。したがっ
て、Al+3Mg+5Zrの量は、1.5〜15重量%の範囲
を満足するものがよい。なお、Al、Mg及びZrは単独、あ
るいは2種又は3種の複合添加でも構わないものの、最
も良い溶接ビード形状を得るにはこれら3種全てを添加
することが最良である。
In order to increase the viscosity of the molten metal, the amount of Al + 3Mg + 5Zr is 1.5% by weight based on the total weight of the gas shielded arc welding flux cored wire.
Those satisfying the range of 15 to 15% by weight are effective. Al,
Both Mg and Zr are powerful deoxidizing agents that increase the viscosity of the molten metal and have the effect of stabilizing the arc with DC positive polarity. However, if the amount of Al + 3Mg + 5Zr is less than 1.5% by weight, such an effect is not sufficient.
Exceeding the viscosity, the viscosity of the molten metal is too high, so that the bead does not fit well and becomes a convex bead and the bead shape deteriorates. Therefore, the amount of Al + 3Mg + 5Zr preferably satisfies the range of 1.5 to 15% by weight. Al, Mg and Zr may be used alone or in combination of two or three, but it is best to add all three in order to obtain the best weld bead shape.

【0012】ここで、溶接金属中の酸素量とワイヤ成分
との関係については、Al,Mg,Zrなどの強力な脱酸剤の
量が多いほど酸素量が減る傾向があるほかに、酸素量を
決定するその他の要因として、これらの脱酸剤とスラグ
剤(フッ化物,酸化物)とのバランス、及びスラグの塩
基度があるため、一義的には定められないものの、前記
したAl+3Mg+5Zrの量が溶接金属中の酸素量を決定す
る最も有力な要因である。なお、Al,Mg,Zr以外の強力
な脱酸剤として、適宜、Ca,Ti,Si,C ,Mnなどをフラ
ックス又は/及び鋼製外皮に含有させることができる。
また、その他のフラックス成分としては、スラグ剤とし
てフッ化物(BaF2,SrF2,CaF2など)や酸化物(MgO ,
Fe2O3 など)を添加することができる。とりわけ、BaF2
は直流正極性でのアークを安定にしてスパッタ発生量を
減らす効果もある。ただし、これらの添加は、当然なが
ら溶接金属中の酸素量が200ppmを超えない範囲と
する必要がある。
Here, regarding the relationship between the amount of oxygen in the weld metal and the wire component, the amount of oxygen tends to decrease as the amount of a strong deoxidizing agent such as Al, Mg, or Zr increases. Other factors that determine the balance are the deoxidizing agent and the slag agent (fluoride, oxide), and the basicity of the slag, which cannot be uniquely determined, but the amount of Al + 3Mg + 5Zr described above. Is the most influential factor in determining the amount of oxygen in the weld metal. In addition, as a strong deoxidizing agent other than Al, Mg, and Zr, Ca, Ti, Si, C, Mn, and the like can be appropriately contained in the flux and / or the steel sheath.
Further, as other flux components, fluoride as slag agent (such as BaF 2, SrF 2, CaF 2 ) and oxide (MgO,
Fe 2 O 3 ). Above all, BaF 2
Has the effect of reducing the amount of spatter generated by stabilizing the arc at DC positive polarity. However, these additions naturally need to be in a range in which the oxygen content in the weld metal does not exceed 200 ppm.

【0013】次に前記に関しては、本願発明による方
法では、ピットの発生を抑制するために、溶接金属中の
窒素量を150ppm以下となるようにし、また、溶接
金属中のP 量を100ppm以上となるようにしてい
る。
[0013] Regarding the above, in the method according to the present invention, in order to suppress the generation of pits, the amount of nitrogen in the weld metal is set to 150 ppm or less, and the amount of P in the weld metal is set to 100 ppm or more. I am trying to become.

【0014】溶融金属から発生する窒素量が多いほどピ
ット発生を助長し、窒素量が少ないほど耐ピットが良
い。本願発明による方法では、セルフシールド溶接法で
なくガスシールド溶接法を採用して溶接部が周囲の空気
に触れないようにシールドを施すようにし、また、前述
したように、本発明に係るガスシールドアーク溶接フラ
ックス入りワイヤによる直流正極性の溶接を行うことで
細かな溶滴をスムーズに移行させて大気の巻き込みをな
くすことにより、溶接金属中の窒素量を150ppm以
下となるようし、これによって優れた耐ピット性を得る
ことができる。溶接金属中の窒素量は、100ppm以
下とすることがより好ましい。
The larger the amount of nitrogen generated from the molten metal, the more pit generation is promoted. The smaller the amount of nitrogen, the better the pit resistance. The method according to the present invention employs a gas shield welding method instead of a self shield welding method so as to provide a shield so that the welded portion does not come into contact with the surrounding air, and as described above, the gas shield according to the present invention. By performing direct current positive polarity welding with an arc welding flux cored wire, fine droplets are smoothly transferred to eliminate entrainment in the atmosphere, so that the nitrogen content in the weld metal is reduced to 150 ppm or less, which is excellent. Pit resistance can be obtained. More preferably, the amount of nitrogen in the weld metal is 100 ppm or less.

【0015】P は、亜鉛との安定な化合物(P −Zn系、
P −Zn−Fe系)を生成し、これにより亜鉛ガスの発生量
を減少させ、ピット発生を抑制する効果がある。ただ
し、当然ながら、このP による効果は、気化した亜鉛ガ
スによって溶融金属が吹き飛ばされるような悪い状態で
は発揮されないものである。本願発明による方法では、
溶接金属中の酸素量が200ppm以下となるように脱
酸剤を含有させ、さらに溶接金属中のP 量が100pp
m以上となるようにP を含有させたガスシールドアーク
溶接フラックス入りワイヤを用いることがよい。
P is a stable compound with zinc (P-Zn system,
P—Zn—Fe system), which has the effect of reducing the amount of zinc gas generated and suppressing pit generation. However, the effect of P is, of course, not exhibited in a bad state in which the molten metal is blown off by the vaporized zinc gas. In the method according to the present invention,
A deoxidizing agent is contained so that the oxygen content in the weld metal is 200 ppm or less, and the P content in the weld metal is 100 pp.
It is preferable to use a gas-shielded arc welding flux-cored wire containing P 2 so as to be at least m.

【0016】本願発明による方法では、シールドガスと
して、炭酸ガスの他に、アルゴンを主体とする混合ガス
(Ar−CO2 混合ガス、Ar−O2混合ガス)、ヘリウムを主
体とする混合ガスが使用可能で、経済性の点からは炭酸
ガスがよい。使用するフラックス入りワイヤのワイヤ断
面形状については、例えば図1(a)〜(d)に示す種
々の形状のものが採用できる。
In the method according to the present invention, in addition to carbon dioxide gas, a mixed gas mainly composed of argon (Ar-CO 2 mixed gas, Ar-O 2 mixed gas) and a mixed gas mainly composed of helium are used as the shielding gas. Carbon dioxide is preferable from the viewpoint of economy and economy. As the wire cross-sectional shape of the flux-cored wire to be used, for example, various shapes shown in FIGS. 1A to 1D can be adopted.

【0017】また、亜鉛めっき鋼板での亜鉛付着量の測
定方法は、JIS H 0401に規定される塩化アン
チモン法によるものである。通常、溶接は継手を構成す
る2枚の鋼板同士を接合するものであり、そのうちの亜
鉛付着量の多い方の値を本発明でいう亜鉛付着量とす
る。溶接継手としては、T継手のすみ肉溶接継手、重ね
継手のすみ肉溶接継手、突合せ継手などの通常の各種溶
接継手の溶接に適用できる。また、溶接金属中の酸素
量、窒素量及びP 量については、JIS Z 3184
による溶着金属の化学分析用試料の作製方法により各分
析用試料をつくり、その値を測定している。
Further, the method for measuring the amount of zinc attached to a galvanized steel sheet is based on the antimony chloride method specified in JIS H0401. Normally, welding is to join two steel plates forming a joint, and the value of the larger amount of zinc adhesion is defined as the amount of zinc adhesion in the present invention. As a welded joint, the present invention can be applied to welding of various ordinary welded joints such as a fillet welded joint of a T joint, a fillet welded joint of a lap joint, and a butt joint. The oxygen content, the nitrogen content and the P content in the weld metal were determined according to JIS Z 3184.
Each analytical sample is made by the method of preparing a sample for chemical analysis of the deposited metal according to the method described above, and the value is measured.

【0018】[0018]

【実施例】表2に示す化学成分の鋼製外皮(JIS G 3141
SPCC-SD相当)を用いて、表3に示す構成のガスシール
ドアーク溶接フラックス入りワイヤを製作した。表3に
おけるwt%はワイヤ全重量に対する重量比である。ま
た、各ワイヤはいずれも、ワイヤ径:φ1.4mm、ワ
イヤ断面形状は図1(b)である。
[Examples] Steel skins (JIS G 3141) having the chemical components shown in Table 2
Using SPCC-SD), gas-shielded arc welding flux cored wires having the configuration shown in Table 3 were produced. The wt% in Table 3 is a weight ratio to the total weight of the wire. Further, each wire has a wire diameter of φ1.4 mm and a wire cross-sectional shape as shown in FIG.

【0019】これらのワイヤを用いて、表1に示す溶接
試験条件で、亜鉛付着量600g/m2 の亜鉛めっき鋼
板を直流正極性で炭酸ガスアーク溶接し、溶接ビード形
状(形状(凹凸)、平滑性及びビード幅の均一性)、ス
パッタ発生量(耐スパッタ性)、及び耐ピット性につい
て評価した。評価は、◎(極めて良好)、○(良好)、
△(やや劣る)、×(劣る)とした。なお、耐ピット性
の評価は溶接長500mmでのピット発生数がゼロを
「○」、1〜2個を「△」としている。溶接試験結果に
ついては、溶接金属中の酸素量、窒素量及びP 量を表3
に示し、評価を表4に示す。
Using these wires, under the welding test conditions shown in Table 1, a galvanized steel sheet having a zinc adhesion amount of 600 g / m 2 was subjected to carbon dioxide gas arc welding with a DC positive polarity to form a weld bead shape (shape (irregularity), smoothness. Properties and bead width uniformity), spatter generation (sputter resistance), and pit resistance. The evaluation was ◎ (very good), ○ (good),
△ (slightly inferior), × (poor). In the evaluation of pit resistance, the number of pits generated at a welding length of 500 mm is zero (○), and one or two pits are “△”. Table 3 shows the amounts of oxygen, nitrogen and P in the weld metal.
And the evaluation is shown in Table 4.

【0020】[0020]

【表1】 [Table 1]

【0021】[0021]

【表2】 [Table 2]

【0022】[0022]

【表3】 [Table 3]

【0023】[0023]

【表4】 [Table 4]

【0024】No.3の比較例は、溶接金属中の酸素量
が本発明で規定する上限値を上回って粘性が低いため、
亜鉛ガスによって溶融金属が吹き飛ばされ、スパッタが
大量に発生し、使えるような溶接ビードが形成されなか
った。No.4の比較例は、直流逆極性を採用したた
め、溶融プールが大きく波立ち乱れて溶接ビード形状が
悪く、スパッタも多発した。なお、このNo.3,N
o.4の比較例では、溶接ビード形状が悪すぎるため
に、ピットについては評価していない。
No. Comparative Example 3 has a low viscosity because the oxygen content in the weld metal exceeds the upper limit specified in the present invention.
The molten metal was blown off by the zinc gas, spatter was generated in large quantities, and no usable weld bead was formed. No. In the comparative example of No. 4, since the direct current reverse polarity was adopted, the molten pool was largely disturbed, the weld bead shape was bad, and spatter occurred frequently. Note that this No. 3, N
o. In Comparative Example 4, the pit was not evaluated because the shape of the weld bead was too bad.

【0025】これに対して、No.1、No.7、N
o.8の各発明例は、亜鉛付着量(600g/m2 )の
多い亜鉛めっき鋼板よりなる被溶接物でも、気化した亜
鉛ガスによって溶融金属が吹き飛ばされるようなことが
なく、良好な形状の溶接ビードを形成でき、スパッタ発
生量が少なく、また、ピットの発生のない溶接を行うこ
とができ、特に、強力な脱酸剤としてAl、Mg及びZrの3
種全てを含むワイヤを用いたNo.8の発明例は、溶接
ビードの形状が極めて良好であった。なお、No.2の
発明例は、溶接金属中の酸素量は上限値を下回り低いも
のの、Al+3Mg+5Zrの量が推奨範囲を下回りアーク安
定性の点でやや劣るため、溶接ビード幅の揃いがやや悪
く、スパッタの発生も少し多く、一方、No.6の発明
例は、Al+3Mg+5Zrの量が推奨範囲を上回って粘性が
やや高く、溶接ビードが凸気味となった。また、No.
5の発明例は、P 量が推奨下限値を下回り、耐ピット性
の点でやや劣っている。
On the other hand, no. 1, No. 7, N
o. In the invention examples 8 described above, a weld bead having a good shape can be obtained even when the molten metal is not blown off by the vaporized zinc gas, even in the case of a workpiece to be formed of a galvanized steel sheet having a large zinc deposition amount (600 g / m 2 ). Can be formed, the amount of spatter generated is small, and welding without pits can be performed. Particularly, strong deoxidizing agents such as Al, Mg and Zr are used.
No. using a wire containing all the seeds. In the invention example No. 8, the shape of the weld bead was extremely good. In addition, No. In the invention example 2, although the amount of oxygen in the weld metal is lower than the upper limit and lower, the amount of Al + 3Mg + 5Zr is lower than the recommended range and the arc stability is slightly inferior, so that the weld bead width is somewhat poor and spatter is generated. A little more, while No. In the invention example No. 6, the amount of Al + 3Mg + 5Zr exceeded the recommended range, the viscosity was slightly higher, and the weld bead became slightly convex. In addition, No.
In the invention example No. 5, the P content is lower than the recommended lower limit, and the pit resistance is slightly inferior.

【0026】[0026]

【発明の効果】以上述べたように、本発明による亜鉛め
っき鋼板のアーク溶接方法によると、亜鉛付着量が30
0g/m2 以上のような亜鉛付着量の多い亜鉛めっき鋼
板よりなる被溶接物でも、気化した亜鉛ガスによって溶
融金属が吹き飛ばされるようなことがなく、良好な形状
の溶接ビードを形成でき、スパッタ発生量が少なく、ま
た、ピットの発生が極めて少なく耐ピット性に優れたガ
スシールドアーク溶接を行うことができ、予め溶接線上
から亜鉛を例えばグラインダーによって機械的に除去し
たり、溶接ビードの手直しをしたりする必要がなく、近
年使用が増加している亜鉛付着量の多い亜鉛めっき鋼板
の溶接の高能率化に貢献することができる。
As described above, according to the arc welding method for galvanized steel sheet according to the present invention, the amount of zinc deposition is 30%.
Even a work piece made of a galvanized steel sheet having a large zinc adhesion amount such as 0 g / m 2 or more can form a weld bead of a good shape without causing molten metal to be blown off by vaporized zinc gas, and It is possible to perform gas shielded arc welding with a small amount of generation and extremely low pits and excellent pit resistance, and mechanically remove zinc from the welding line in advance using a grinder, for example, or modify welding beads. Therefore, it is possible to contribute to the improvement of the efficiency of welding of a galvanized steel sheet having a large amount of zinc adhesion, which has been increasingly used in recent years.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明による方法に用いるフラックス入りワイヤの断面
形状の例を模式的に示す図である。
FIG. 1 is a diagram schematically showing an example of a cross-sectional shape of a flux-cored wire used in a method according to the present invention.

【符号の説明】[Explanation of symbols]

M…鋼製外皮 F…フラックス M: steel skin F: flux

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 亜鉛めっき鋼板をアーク溶接する方法に
おいて、鋼製外皮内にフラックスを充填してなるガスシ
ールドアーク溶接フラックス入りワイヤを用いて、溶接
金属中の酸素量を200ppm以下とするとともに、直
流正極性でガスシールドアーク溶接を行うことを特徴と
する亜鉛めっき鋼板のアーク溶接方法。
1. A method for arc welding a galvanized steel sheet, wherein a gas-shielded arc welding flux-cored wire formed by filling a steel shell with a flux is used to reduce the oxygen content in the weld metal to 200 ppm or less. An arc welding method for a galvanized steel sheet, comprising performing gas shielded arc welding with a DC positive polarity.
【請求項2】 前記亜鉛めっき鋼板はその亜鉛付着量が
300g/m2 以上のものであることを特徴とする請求
項1記載の亜鉛めっき鋼板のアーク溶接方法。
2. The arc welding method for a galvanized steel sheet according to claim 1, wherein the galvanized steel sheet has a zinc adhesion amount of 300 g / m 2 or more.
【請求項3】 前記ガスシールドアーク溶接フラックス
入りワイヤが、ワイヤ全重量に対する重量%で、Al+3
Mg+5Zr:1.5〜15重量%を満足するものであるこ
とを特徴とする請求項1又は請求項2に記載の亜鉛めっ
き鋼板のアーク溶接方法。
3. The gas-shielded arc welding flux cored wire according to claim 1, wherein the weight percentage of the total weight of the wire is Al + 3.
The arc welding method for a galvanized steel sheet according to claim 1 or 2, wherein Mg + 5Zr: 1.5 to 15% by weight is satisfied.
【請求項4】 溶接金属中の窒素量を150ppm以下
とすることを特徴とする請求項1から請求項3のいずれ
か1項に記載の亜鉛めっき鋼板のアーク溶接方法。
4. The arc welding method for a galvanized steel sheet according to claim 1, wherein the amount of nitrogen in the weld metal is set to 150 ppm or less.
【請求項5】 溶接金属中のP 量を100ppm以上と
することを特徴とする請求項1から請求項4のいずれか
1項に記載の亜鉛めっき鋼板のアーク溶接方法。
5. The arc welding method for a galvanized steel sheet according to claim 1, wherein the P content in the weld metal is set to 100 ppm or more.
JP04052198A 1998-02-23 1998-02-23 Arc welding method for galvanized steel sheet Expired - Lifetime JP3513382B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04052198A JP3513382B2 (en) 1998-02-23 1998-02-23 Arc welding method for galvanized steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04052198A JP3513382B2 (en) 1998-02-23 1998-02-23 Arc welding method for galvanized steel sheet

Publications (2)

Publication Number Publication Date
JPH11239880A true JPH11239880A (en) 1999-09-07
JP3513382B2 JP3513382B2 (en) 2004-03-31

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ID=12582820

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3513382B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105189031A (en) * 2013-03-13 2015-12-23 林肯环球股份有限公司 Consumable for specially coated metals
CN109226938A (en) * 2017-07-10 2019-01-18 株式会社神户制钢所 Multielectrode gas-shielded electric arc single side soldering method
JP2019013980A (en) * 2017-07-10 2019-01-31 株式会社神戸製鋼所 Multi-electrode gas shield arc single-sided welding method
JP2019089099A (en) * 2017-11-14 2019-06-13 日新製鋼株式会社 Composite welding method of zinc-based plated steel sheet

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105189031A (en) * 2013-03-13 2015-12-23 林肯环球股份有限公司 Consumable for specially coated metals
CN109226938A (en) * 2017-07-10 2019-01-18 株式会社神户制钢所 Multielectrode gas-shielded electric arc single side soldering method
JP2019013980A (en) * 2017-07-10 2019-01-31 株式会社神戸製鋼所 Multi-electrode gas shield arc single-sided welding method
CN109226938B (en) * 2017-07-10 2021-06-15 株式会社神户制钢所 Multi-electrode gas shielded arc single-side welding method
JP2019089099A (en) * 2017-11-14 2019-06-13 日新製鋼株式会社 Composite welding method of zinc-based plated steel sheet

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