JP3513382B2 - Arc welding method for galvanized steel sheet - Google Patents
Arc welding method for galvanized steel sheetInfo
- Publication number
- JP3513382B2 JP3513382B2 JP04052198A JP4052198A JP3513382B2 JP 3513382 B2 JP3513382 B2 JP 3513382B2 JP 04052198 A JP04052198 A JP 04052198A JP 4052198 A JP4052198 A JP 4052198A JP 3513382 B2 JP3513382 B2 JP 3513382B2
- Authority
- JP
- Japan
- Prior art keywords
- arc welding
- galvanized steel
- amount
- steel sheet
- zinc
- 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.)
- Expired - Lifetime
Links
- 238000003466 welding Methods 0.000 title claims description 58
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 30
- 239000008397 galvanized steel Substances 0.000 title claims description 30
- 238000000034 method Methods 0.000 title claims description 26
- 239000011701 zinc Substances 0.000 claims description 37
- 229910052725 zinc Inorganic materials 0.000 claims description 36
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 35
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 239000007789 gas Substances 0.000 claims description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 230000004907 flux Effects 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000011324 bead Substances 0.000 description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910052726 zirconium Inorganic materials 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910016036 BaF 2 Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 150000002222 fluorine compounds Chemical class 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- -1 zinc cations Chemical class 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000000538 analytical sample Substances 0.000 description 1
- FAPDDOBMIUGHIN-UHFFFAOYSA-K antimony trichloride Chemical compound Cl[Sb](Cl)Cl FAPDDOBMIUGHIN-UHFFFAOYSA-K 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
- Nonmetallic Welding Materials (AREA)
Description
【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。TECHNICAL FIELD The present invention has a zinc deposition amount of 30.
Even a welded object made of a galvanized steel sheet with a large amount of zinc adhered such as 0 g / m 2 or more can form a weld bead with a good shape, the amount of spatter is small, and the occurrence of pit defects is significantly small. The present invention relates to an arc welding method for galvanized steel sheets, which enables 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 known as a steel material which is anticorrosive and has excellent corrosion resistance. The main application of galvanized steel sheets is in the field of thin plates such as building materials and automobile bodies, but recently, in order to further improve corrosion resistance, it is often used as a thick coating material with a large amount of zinc, such as water and gas piping materials. It is becoming 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 zinc adhesion amount is, for example, 300 g
When arc welding of galvanized steel sheet with a large amount of zinc deposited such as / m 2 or more, zinc is rapidly vaporized by arc heat,
Molten metal such as molten pool and droplets is blown off by the vaporized zinc gas, which causes a large amount of spatter, and pits (pore defects appearing on the bead surface) due to the vaporization of zinc in the welding beads. Or When the spatter is remarkably generated, a large amount of molten metal may be blown off and the 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 beforehand by, for example, a grinder, but such a method requires much labor and is extremely inefficient. . Therefore, for the purpose of preventing welding defects such as pits and suppressing the generation of spatter to improve welding workability, in JP-A-61-169196, a shield gas or flux is supplied from the outside. There has been proposed a flux-cored wire for self-shielded arc welding that performs welding without the need for welding. Further, in Japanese Patent Laid-Open No. 6-15484, a gas shielded arc welding flux cored wire obtained by filling a flux containing a slag forming agent, metallic titanium or a mixture of metallic titanium and metallic boron, and a fluoride in a steel shell. Is proposed. However, welding using these wires was not sufficient in eliminating the damage 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。OBJECTS OF THE INVENTION It is an object of The present invention is also a welded object zinc coating weight is more than galvanized steel sheet 300 g / m 2 or more such zinc coating weight, the molten metal by the vaporized zinc gas Is not blown away, it is possible to form a weld bead with a good shape, the amount of spatter is small, and the occurrence of pit defects is extremely small, and it is possible to perform gas shield arc welding with excellent pit resistance. An object is to provide an arc welding method for galvanized steel sheets.
【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。In order to achieve the above-mentioned object, the invention of claim 1 uses a gas shielded arc welding flux cored wire obtained by filling a steel shell with a flux in a weld metal. Is an arc welding method for galvanized steel sheets in which the amount of oxygen is 200 ppm or less and gas shielded arc welding is performed with direct current 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／
ｍ2 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 the invention of claim 2, in the invention of claim 1, the galvanized steel sheet has a zinc adhesion amount of 300 g /
This is an arc welding method for galvanized steel sheets of m 2 or more. According to a third aspect of the present invention, in the first or second aspect of the invention, the gas shielded arc welding flux-cored wire is Al + 3Mg + 5Z in weight% with respect to the total weight of the wire.
r: An arc welding method for galvanized steel sheet satisfying 1.5 to 15% by weight. A fourth aspect of the invention is the arc welding method for galvanized steel sheet according to the first, second or third aspect of the invention, wherein the amount of nitrogen in the weld metal is 150 ppm or less. The invention of claim 5 is the same as claim 1,
In the invention of 2, 3 or 4, the amount of P in the weld metal is 10
This is an arc welding method for a galvanized steel sheet with 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 galvanized steel sheet according to the present invention, a weld bead having a good shape is formed even in the welding of a galvanized steel sheet having a large zinc deposit such as a zinc deposit of 300 g / m 2 or more. The following measures have been taken to reduce the generation of spatters and the generation of pits in addition to the formation 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。First, regarding the above, focusing on increasing the viscosity of the molten metal so that the molten metal is not blown off by the vaporized zinc gas, gas shielded arc welding in which a strong deoxidizer is contained in the flux A flux-cored wire is used to increase the viscosity by reducing the amount of oxygen in the molten metal due to the effect of the deoxidizer. Further, by adopting DC positive polarity (DC arc welding in which the wire is the negative electrode and the object to be welded is a galvanized steel sheet is the positive electrode), zinc cations collide with the droplets formed at the tip of the wire. Therefore, even if the droplet has a high viscosity and a large surface tension, the droplet easily separates from the wire tip, and the fine droplet due to the collision smoothly transfers to the welded object. By doing so, the arc is stabilized and the amount of spatter generated is reduced. In general, when using a gas shielded arc welding flux-cored wire, the reverse polarity of DC (wire: positive electrode, work piece: negative electrode) is adopted. The collision will cause a large fluctuation in 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。The oxygen content in the weld metal is 200 pp
By using a gas shielded arc welding flux-cored wire containing a deoxidizer so as to be m or less, a molten bead 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, a gas shielded arc welding flux-cored wire is used in which the amount of Al + 3Mg + 5Zr is 1.5% by weight based on the total weight of the wire.
Those satisfying the range of up to 15% by weight are effective. Al,
Both Mg and Zr are strong deoxidizers and have the effects of increasing the viscosity of the molten metal and stabilizing the arc in the DC positive polarity. However, if the amount of Al + 3Mg + 5Zr is less than 1.5% by weight, such an effect is not sufficient, while 15% by weight
When it exceeds, the viscosity of the molten metal is too high and the bead is not well-fitted to form a convex bead and the bead shape is deteriorated. Therefore, it is preferable that the amount of Al + 3Mg + 5Zr satisfies the range of 1.5 to 15% by weight. Although Al, Mg and Zr may be added singly or in combination of two or three kinds, it is best to add all three kinds 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 components, the amount of oxygen tends to decrease as the amount of a strong deoxidizer such as Al, Mg and Zr increases, and Other factors that determine the balance of these deoxidizers and slag agents (fluorides, oxides), and the basicity of the slag cannot be uniquely determined, but the amount of Al + 3Mg + 5Zr mentioned above Is the most influential factor that determines the amount of oxygen in the weld metal. As a strong deoxidizing agent other than Al, Mg, and Zr, Ca, Ti, Si, C, Mn, etc. can be appropriately contained in the flux or / and the steel shell.
Other flux components include fluorides (BaF 2 , SrF 2 , CaF 2, etc.) and oxides (MgO 2, etc.) as slag agents.
Fe 2 O 3 etc.) can be added. Above all, BaF 2
Also has the effect of stabilizing the arc with DC positive polarity and reducing the amount of spatter generated. However, as a matter of course, it is necessary to add these within a range in which the amount of oxygen 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。Regarding the above, in the method according to the present invention, the nitrogen content in the weld metal is set to 150 ppm or less and the P content in the weld metal is set to 100 ppm or more in order to suppress the generation of pits. 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。A larger amount of nitrogen generated from the molten metal promotes pit formation, and a smaller amount of nitrogen results in better pit resistance. In the method according to the present invention, the gas shield welding method is adopted instead of the self-shield welding method so that the welded portion is shielded from contact with the surrounding air. By arc-welding flux-cored wire for direct current positive welding, fine droplets are smoothly transferred to eliminate the entrainment of the atmosphere, so that the amount of nitrogen in the weld metal is 150 ppm or less, which is excellent. The pit resistance can be obtained. The amount of nitrogen in the weld metal is more preferably 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) is generated, and this has the effect of reducing the amount of zinc gas generated and suppressing pit generation. However, as a matter of course, the effect of P is not exerted in a bad state where the molten metal is blown off by the vaporized zinc gas. In the method according to the present invention,
A deoxidizer is added 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 so as to have m or more.
【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, as the shield gas, in addition to carbon dioxide gas, a mixed gas mainly containing argon (Ar—CO 2 mixed gas, Ar—O 2 mixed gas) and a mixed gas mainly containing helium are used. Carbon dioxide is good because it is usable and economical. With respect to the wire cross-sectional shape of the flux-cored wire used, for example, various wire 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。The zinc adhesion amount on the galvanized steel sheet is measured by the antimony chloride method specified in JIS H 0401. Usually, welding joins two steel plates forming a joint, and the value with the larger zinc adhesion amount is taken as the zinc adhesion amount in the present invention. As the welded joint, it is applicable to welding of various ordinary welded joints such as a fillet welded joint for a T joint, a fillet welded joint for a lap joint, and a butt joint. Regarding the amount of oxygen, the amount of nitrogen and the amount of P in the weld metal, JIS Z 3184
Each analytical sample is prepared by the method for preparing a sample for chemical analysis of deposited metal according to, 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 having the chemical composition shown in Table 2 (JIS G 3141
(Corresponding to SPCC-SD) was used to manufacture a gas shielded arc welding flux-cored wire having the configuration shown in Table 3. The wt% in Table 3 is the weight ratio with respect to the total weight of the wire. Each wire has a wire diameter of φ1.4 mm and a wire cross-sectional shape as shown in FIG. 1 (b).
【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, galvanized steel sheets having a zinc adhesion amount of 600 g / m 2 were subjected to carbon dioxide arc welding with direct current positive polarity to obtain a weld bead shape (shape (unevenness), smoothness). And uniformity of bead width), spatter generation amount (sputter resistance), and pit resistance were evaluated. The evaluation is ◎ (extremely good), ○ (good),
It was rated as Δ (slightly inferior) or × (inferior). In the evaluation of pit resistance, the number of pits generated at a welding length of 500 mm was zero, and the number of pits was one, and the number of pits was 1-2. As for the welding test results, 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. In the comparative example of 3, since the amount of oxygen in the weld metal exceeds the upper limit defined by the present invention and the viscosity is low,
Molten metal was blown away by the zinc gas, a large amount of spatter was generated, and a usable welding bead was not formed. No. In the comparative example of 4, since the DC reverse polarity was adopted, the molten pool was greatly disturbed, the weld bead shape was bad, and spatter frequently occurred. In addition, this No. 3, N
o. In the comparative example of 4, the pits were not evaluated because the weld bead shape 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, in No. 1, No. 7, N
o. Each of the invention examples of No. 8 is a weld bead having a good shape, even if the object to be welded is made of a galvanized steel sheet having a large amount of deposited zinc (600 g / m 2 ) without the molten metal being blown off by the vaporized zinc gas. Can be formed, the amount of spatter generated is small, and welding can be performed without the formation of pits. In particular, Al, Mg, and Zr, which are strong deoxidizers, can be used.
No. using a wire containing all seeds In the invention example of 8, the shape of the weld bead was extremely good. In addition, No. In Example 2 of the invention, the amount of oxygen in the weld metal is lower than the upper limit and low, but the amount of Al + 3Mg + 5Zr is lower than the recommended range and the arc stability is slightly inferior. A little more, while No. In the invention example of 6, the amount of Al + 3Mg + 5Zr exceeded the recommended range, the viscosity was slightly high, and the weld bead became convex. In addition, No.
In the invention example of 5, the P content is below the recommended lower limit value, 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 deposited is 30.
Even for a welded object made of a galvanized steel sheet with a large amount of zinc attached, such as 0 g / m 2 or more, a molten bead is not blown off by vaporized zinc gas, and a weld bead with a good shape can be formed, resulting in spattering. It is possible to perform gas shielded arc welding with a small amount of pits and extremely few pits and excellent pit resistance, and mechanically remove zinc from the welding line beforehand, for example, by a grinder, or rework the welding beads. It is possible to contribute to higher welding efficiency of galvanized steel sheets with a large amount of zinc deposited, which has been increasingly used in recent years.
【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.
Ｍ…鋼製外皮 Ｆ…フラックス M ... Steel skin F ... Flux
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−55696（ＪＰ，Ａ) 特開 平10−180487（ＪＰ，Ａ) 特開 平９−206945（ＪＰ，Ａ) 特開 平５−228691（ＪＰ，Ａ) 特開 平４−294869（ＪＰ，Ａ) 特公 昭63−57155（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 35/368 B23K 9/23 B23K 35/30 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-2-55696 (JP, A) JP-A-10-180487 (JP, A) JP-A-9-206945 (JP, A) JP-A-5- 228691 (JP, A) JP-A-4-294869 (JP, A) JP-B-63-57155 (JP, B2) (58) Fields investigated (Int.Cl. 7 , DB name) B23K 35/368 B23K 9 / 23 B23K 35/30
Claims (5)
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 having a steel shell filled with a flux is used to reduce the oxygen content in the weld metal to 200 ppm or less. An arc welding method for galvanized steel sheet, which comprises performing gas shield arc welding with direct current positive polarity.
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 of 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.
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, in wt% relative to the total weight of the wire, is Al + 3.
Mg + 5Zr: 1.5-15 weight% is satisfied, The arc welding method of the galvanized steel plate of Claim 1 or Claim 2 characterized by the above-mentioned.
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 galvanized steel sheet according to claim 1, wherein the amount of nitrogen in the weld metal is 150 ppm or less.
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 galvanized steel sheet according to any one of claims 1 to 4, wherein the amount of P 2 in the weld metal is 100 ppm or more.
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 JPH11239880A (en) | 1999-09-07 |
| JP3513382B2 true JP3513382B2 (en) | 2004-03-31 |
Family
ID=12582820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04052198A Expired - Lifetime JP3513382B2 (en) | 1998-02-23 | 1998-02-23 | Arc welding method for galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3513382B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140263259A1 (en) * | 2013-03-13 | 2014-09-18 | Lincoln Global, Inc. | Consumable for specially coated metals |
| JP6875232B2 (en) * | 2017-07-10 | 2021-05-19 | 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 |
-
1998
- 1998-02-23 JP JP04052198A patent/JP3513382B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11239880A (en) | 1999-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20060096966A1 (en) | Self-shielded flux cored electrode for fracture critical applications | |
| JP2000233296A (en) | Metallic core welding wire rod | |
| US11426824B2 (en) | Aluminum-containing welding electrode | |
| WO2016175154A1 (en) | Flux cored wire for gas-shielded arc welding and welding method | |
| JPS61286089A (en) | Gas shielded arc welding method | |
| KR100343750B1 (en) | Pit and blow hole resistant flux-cored wire electrode for gas-shielded arc-welding of galvanized steel sheet | |
| JPS5913955B2 (en) | Composite wire for stainless steel welding | |
| CN113613829A (en) | Ni-based alloy flux-cored wire | |
| JPWO2020110856A1 (en) | Flux-filled wire and welded joint manufacturing method | |
| JP3513382B2 (en) | Arc welding method for galvanized steel sheet | |
| JP2006035294A (en) | Joining method for zinc-based alloy-plated steel sheets with excellent corrosion resistance at joints | |
| JP2711077B2 (en) | Flux-cored wire for gas shielded arc welding | |
| JP2019042782A (en) | Gas shield arc-welding flux-cored wire and manufacturing method of welding joint | |
| JP3513380B2 (en) | Carbon dioxide arc welding flux cored wire for DC positive polarity and welding method | |
| WO2020012925A1 (en) | Flux-cored wire for two-phase stainless steel welding, welding method and welding metal | |
| JPH09206984A (en) | Gas shield arc welding method for thin plates | |
| JP2005230912A (en) | Flux-cored wire for arc welding having excellent resistance to liquid metal embrittlement cracking and arc welding method | |
| JP2668125B2 (en) | Welding method of galvanized steel sheet | |
| JPH0771760B2 (en) | Self shielded arc welding flux cored wire for all position welding | |
| JP2694034B2 (en) | Flux-cored wire for high current density gas shielded arc welding | |
| JPH05228691A (en) | Flux-cored wire for self-shielded arc welding | |
| JPH0510199B2 (en) | ||
| JP3512340B2 (en) | Flux-cored wire for gas shielded arc welding | |
| JP3223259B2 (en) | Flux-cored wire for galvanized steel welding | |
| JP3512313B2 (en) | Flux-cored wire for gas shielded arc welding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20031224 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040109 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080116 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090116 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100116 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110116 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120116 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130116 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130116 Year of fee payment: 9 |
|
| EXPY | Cancellation because of completion of term |