JP2000176644A - ARC WELDING METHOD OF Al BASE PLATED STEEL SHEET - Google Patents
ARC WELDING METHOD OF Al BASE PLATED STEEL SHEETInfo
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- JP2000176644A JP2000176644A JP10355262A JP35526298A JP2000176644A JP 2000176644 A JP2000176644 A JP 2000176644A JP 10355262 A JP10355262 A JP 10355262A JP 35526298 A JP35526298 A JP 35526298A JP 2000176644 A JP2000176644 A JP 2000176644A
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- Prior art keywords
- gas
- plated steel
- welding
- steel sheet
- brazing
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車の燃料タン
クや排気系部品、建築物の外壁、などの材料として用い
られるＡｌ系めっき鋼板のアーク溶接方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc welding method for an Al-based plated steel sheet used as a material for a fuel tank and exhaust system parts of an automobile, an outer wall of a building, and the like.
【０００２】[0002]
【従来の技術】自動車に搭載される燃料タンクの材料と
しては、従来まで、Ｐｂ−Ｓｎ合金めっき鋼板が使用さ
れてきた。しかし、最近、環境保護の立場から、Ｐｂに
対する規制が一段と厳しくなり、これに対応して、Ｐｂ
−Ｓｎ合金めっき鋼板の代わりに、Ａｌ−Ｓｉ合金めっ
き鋼板を使おうという動きが出てきている。一方、自動
車の組立では、主にスポット溶接やシーム溶接などの抵
抗溶接が使われており、めっき鋼板を素材とする燃料タ
ンクの製造でも、主にこれらの接合法が使われている。
しかし、口金部や燃料供給パイプなど形状的に抵抗溶接
が難しい箇所では、ろう付やはんだ付が使われている。2. Description of the Related Art As a material for a fuel tank mounted on an automobile, a Pb-Sn alloy-plated steel sheet has hitherto been used. However, recently, from the standpoint of environmental protection, regulations on Pb have become even more stringent.
There has been a movement to use an Al—Si alloy plated steel sheet instead of a —Sn alloy plated steel sheet. On the other hand, resistance welding such as spot welding and seam welding is mainly used in assembling automobiles, and these joining methods are also mainly used in manufacturing a fuel tank using plated steel sheets as a material.
However, brazing or soldering is used in places where resistance welding is difficult due to its shape, such as a base or a fuel supply pipe.
【０００３】ろう付とは、母材より融点が低い金属（ろ
う）を用い、加熱によってろうのみを溶融させて母材同
士を接合する方法である。ろう付の中で、４５０℃より
融点が低い金属（はんだ）を用いて接合する方法を、特
にはんだ付と呼んでいる。ろう付やはんだ付を用いれ
ば、簡便な手段で精密な接合が可能となり、また、コス
ト低減にもつながるため、車体の接合では既に一部で実
用化されている。今後、燃料タンクなどの自動車部品に
Ａｌ系めっき鋼板が適用されるようになると、Ａｌ系め
っき鋼板をろう付やはんだ付する必要性が高まるものと
考えられる。[0003] Brazing is a method of using a metal (brazing) having a lower melting point than a base material and melting only the brazing by heating to join the base materials together. The method of joining using a metal (solder) having a melting point lower than 450 ° C. during brazing is particularly called soldering. If brazing or soldering is used, precise joining can be achieved by simple means, and this also leads to cost reduction. Therefore, some joining of vehicle bodies has already been put to practical use. If Al-based plated steel sheets are applied to automobile parts such as fuel tanks in the future, it is considered that the necessity of brazing or soldering Al-based plated steel sheets will increase.
【０００４】しかし、Ａｌ−Ｓｉ合金めっき鋼板などに
代表されるＡｌ系めっき鋼板のろう付性、はんだ付性は
非常に悪いことが知られている。すなわち、従来、Ｐｂ
−Ｓｎ合金めっき鋼板のろう付、はんだ付で用いられて
いたろう、はんだとそれ用のフラックスを用いても、十
分なぬれ性（広がり性）が得られないのである。これ
は、Ａｌ系めっき鋼板の表面に緻密なＡｌ酸化膜が存在
するためであり、この酸化膜が、従来のめっき鋼板で使
用していたフラックスでは除去できないためである。[0004] However, it is known that the brazing property and the solderability of an Al-based plated steel sheet represented by an Al-Si alloy-plated steel sheet are very poor. That is, conventionally, Pb
Even if the solder and the flux used for brazing and soldering of the Sn alloy plated steel sheet are used, sufficient wettability (spreadability) cannot be obtained. This is because a dense Al oxide film exists on the surface of the Al-based plated steel sheet, and this oxide film cannot be removed by the flux used in the conventional plated steel sheet.
【０００５】Ａｌ系めっき鋼板をろう付、はんだ付する
ひとつの方法として、Ａｌ系めっき鋼板のめっき層を鋼
板表面から除去する方法が考えられる。しかし、鋼板表
面に形成されたＡｌ系めっき層は、鋼板の耐食性を向上
させる上で重要である。したがって、このようなめっき
層を安易に除去することは、耐食性を低下させる原因と
なる。また、一旦形成されたＡｌ系めっき層を除去する
ことは、組立行程時の工数増加および生産性の低下を招
く。この意味から、この方法を採用することはできな
い。As one method of brazing and soldering an Al-based plated steel sheet, a method of removing a plating layer of the Al-based plated steel sheet from the surface of the steel sheet can be considered. However, the Al-based plating layer formed on the steel sheet surface is important for improving the corrosion resistance of the steel sheet. Therefore, easily removing such a plating layer causes a reduction in corrosion resistance. Further, removing the Al-based plating layer once formed causes an increase in man-hours during the assembling process and a decrease in productivity. In this sense, this method cannot be adopted.
【０００６】Ａｌ系めっき鋼板をろう付、はんだ付する
別の方法として、ＡｌおよびＡｌ系合金のろう付、はん
だ付に用いられているろう（Ａｌ−Ｓｉ系）、はんだ
（Ｚｎ−Ａｌ系、Ｚｎ−Ｃｄ系、Ｚｎ−Ｓｎ系、など）
とフラックスを用いてろう付、はんだ付を行う方法も考
えられる。しかし、これらの方法を用いた場合には、い
ずれもろう付、はんだ付部の接合強度が低くなるという
問題点がある。ろう付の場合に接合強度が低くなるの
は、ろう付加熱中にＡｌ系めっき層が溶融し、めっき層
と鋼板との間でＦｅ−Ａｌ−Ｓｉ系金属間化合物層が成
長して、Ａｌ系めっき層が剥離し易くなるからである。
また、はんだ付の場合に接合強度が低くなるのは、十分
なぬれ性が得られなかったり、はんだ自身の強度が低い
ためである。As another method of brazing and soldering an Al-based plated steel sheet, brazing of Al and an Al-based alloy, brazing (Al-Si based) used for soldering, solder (Zn-Al based, Zn-Cd system, Zn-Sn system, etc.)
It is also conceivable to perform brazing and soldering using a flux. However, when any of these methods is used, there is a problem that the joining strength of the brazed and soldered portions is reduced. In the case of brazing, the bonding strength decreases because the Al-based plating layer melts during the heat of brazing, the Fe-Al-Si-based intermetallic compound layer grows between the plated layer and the steel sheet, and the Al-based plating layer grows. This is because the plating layer is easily peeled.
In addition, the reason why the bonding strength is low in the case of soldering is that sufficient wettability cannot be obtained or the strength of the solder itself is low.
【０００７】これらの方法とは別に、特開平８−２９０
２９３号公報に開示されているように、アルミニウムよ
り融点が高い金属をろう材として使用し、弗化アルミニ
ウムを含む塩化物フラックスを使用してめっき層を排除
し、直接Ａｌ系めっき鋼板の下地鋼板にろう付する方法
も考えられている。しかし、この方法では、ろう付温度
が高いため、ろう付部周辺のめっき層が損傷を受けて耐
食性が低下する恐れがある。また、フラックスの活性温
度に比べて、ろう付温度がはるかに高いため、ろう付中
にフラックスが多量に蒸発し、作業環境が悪くなるとい
う問題点もある。さらに、ろう付後に腐食性が高いフラ
ックスが残留するため、十分な洗浄性を必要とするとい
う問題点もある。特に、後行程で塗装を行う場合には、
フラックスの完全除去は必須となる。この意味から、フ
ラックスの洗浄性は重要である。Apart from these methods, Japanese Patent Application Laid-Open No. 8-290
As disclosed in Japanese Patent No. 293, a metal plate having a melting point higher than that of aluminum is used as a brazing filler metal, and a plating layer is eliminated by using a chloride flux containing aluminum fluoride, so that a base steel plate of an Al-based plated steel plate is directly used. Brazing methods have also been considered. However, in this method, since the brazing temperature is high, the plating layer around the brazed portion may be damaged and the corrosion resistance may be reduced. Further, since the brazing temperature is much higher than the activation temperature of the flux, a large amount of the flux evaporates during the brazing, which causes a problem that the working environment is deteriorated. Furthermore, since a highly corrosive flux remains after brazing, there is a problem that sufficient cleaning properties are required. In particular, when painting in the later process,
Complete removal of flux is essential. In this sense, the detergency of the flux is important.
【０００８】また、Ｃｕ−Ｓｉ合金系のワイヤー（ろ
う）を用い、シールドガスとしてＡｒを用いたアーク中
でこのワイヤーを溶融させることによりろう付する方法
（アークろう付）を用いることも考えられる。しかし、
Ａｌ系めっき鋼板をアークろう付すると、ビード（ろ
う）の部分で割れが発生し易いという問題点がある。そ
れに加え、円形の口金部をアークろう付する場合には、
ビードの始端と終端でラップ部が生じるが、この部分の
溶融は不完全になるため、この部分で欠陥が発生し、機
密性が悪くなる（漏れが発生する）という問題も抱えて
いる。It is also conceivable to use a method in which a Cu-Si alloy-based wire (brazing) is used and brazing is performed by melting the wire in an arc using Ar as a shielding gas (arc brazing). . But,
When the Al-plated steel sheet is arc-brazed, there is a problem that a crack is easily generated at a bead (brazing) portion. In addition, when arc brazing a circular base,
Although a wrap portion is formed at the beginning and end of the bead, the melting of this portion is incomplete, so that a defect is generated at this portion and the security is deteriorated (leakage occurs).
【０００９】[0009]
【発明が解決しようとする課題】そこで、本発明の目的
は、今後、自動車への適用が拡大すると考えられるＡｌ
系めっき鋼板の接合法として、ろう付、はんだ付以外の
方法を提供することにある。すなわち、上記で述べたろ
う付やはんだ付と異なり、Ａｌ系めっき鋼板の接合にお
いて施工性が良く、接合部の特性（接合強度、機密性、
耐食性）に優れ、かつ、コスト上昇や生産性低下の大き
な問題となる後処理が不要な接合法を提供することにあ
る。また、Ａｌ系めっき鋼板とＡｌ系以外のめっき（例
えば、Ｚｎ系めっき、Ｓｎ−Ｚｎ系めっき、Ｎｉめっ
き、など）が施された鋼板あるいはパイプとの接合にも
適用可能な接合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 an aluminum alloy which is expected to be applied to automobiles in the future.
An object of the present invention is to provide a method other than brazing and soldering as a joining method for a system-plated steel sheet. That is, unlike the brazing and soldering described above, the workability of joining Al-based plated steel sheets is good, and the characteristics of the joining parts (joining strength, confidentiality,
It is an object of the present invention to provide a bonding method which is excellent in corrosion resistance) and does not require a post-treatment which causes a major problem of cost increase and productivity reduction. Also, the present invention provides a bonding method applicable to bonding between an Al-based plated steel sheet and a steel sheet or pipe plated with a plating other than Al-based (for example, Zn-based plating, Sn—Zn-based plating, Ni plating, etc.). It is in.
【００１０】[0010]
【課題を解決するための手段】上記で述べた課題を解決
するために、本発明では、Ａｌ系めっき鋼板の接合法と
して、ＣＯ2 ガスをシールドガスに用いるＭＩＧ溶接
法、およびＡｒ＋ＣＯ2ガスをシールドガスに用いると
ＭＡＧ溶接法を提案する。従来、Ａｌ系めっき鋼板をア
ーク溶接する場合には、ＴＩＧ溶接法が主に用いられて
きた。これは、Ａｌ系めっき鋼板では、板厚が薄い
（０．６〜１．６ｍｍ）場合が多いため、ＭＩＧ溶接や
ＭＡＧ溶接では入熱が大き過ぎて、Ａｌ系めっき鋼板自
体が溶け落ちてしまうからである。しかし、Ａｌ系めっ
き鋼板のＴＩＧ溶接では、溶接中にＡｌ系めっきが鋼板
中に混入するため、フェライト組織が安定化されて、溶
接後の冷却中にフェライトの結晶粒が粗大化し、その部
分の強度が大幅に低下するという問題があった。In order to solve the above-mentioned problems, according to the present invention, as a joining method of an Al-based plated steel sheet, a MIG welding method using CO 2 gas as a shielding gas and an Ar + CO 2 gas are used. A MAG welding method is proposed when used for shielding gas. Conventionally, in the case of arc welding of an Al-based plated steel sheet, a TIG welding method has been mainly used. This is because, in the case of Al-based plated steel sheets, the sheet thickness is often thin (0.6 to 1.6 mm), so that the heat input is too large in MIG welding or MAG welding, and the Al-based plated steel sheets themselves melt off. Because. However, in TIG welding of an Al-based plated steel sheet, since the Al-based plating is mixed into the steel sheet during welding, the ferrite structure is stabilized, and the crystal grains of the ferrite become coarse during cooling after welding, so that the There was a problem that the strength was significantly reduced.
【００１１】一方、最近、ＭＩＧ溶接やＭＡＧ溶接で
も、直径０．６〜０．８ｍｍの細径ワイヤーが用いられ
るようになり、この細径ワイヤーを用いれば、板厚が薄
い鋼板の溶接も可能である。そこで、Ａｌ系めっき鋼板
の溶接にＭＩＧ溶接法やＭＡＧ溶接法を用いたところ、
溶接部の結晶粒の粗大化が防止されることがわかった。
これは、ＭＩＧ溶接やＭＡＧ溶接では、ＴＩＧ溶接と異
なり、シールドガスにＣＯ2 ガスやＡｒ＋ＣＯ2 ガスを
用いるため、ＣＯ2 ガスがアーク中で分解してＯ 2 ガス
となり、これがＡｌ系めっき中のＡｌと反応してＡｌ2
Ｏ3 を生成し、鋼板中へのＡｌの混入が防止されるため
と考えられる。ここに、本発明の要旨とするところは、
Ａｌ系めっき鋼板のアーク溶接において、ＣＯ2 ガスま
たはＡｒとＣＯ2 が混合されたガスをシールドガスに用
い、ＭＩＧ溶接またはＭＡＧ溶接を行うことを特徴とす
るＡｌ系めっき鋼板のアーク溶接方法である。On the other hand, recently, MIG welding and MAG welding
Also, a thin wire with a diameter of 0.6 to 0.8 mm is used
When using this small diameter wire, the plate thickness becomes thin.
Welding of steel sheets is also possible. Therefore, Al-based plated steel sheet
When MIG welding and MAG welding were used for welding
It was found that the coarsening of the crystal grains at the weld was prevented.
This is different from TIG welding in MIG welding and MAG welding.
And CO as shielding gasTwoGas or Ar + COTwoGas
To use, COTwoThe gas decomposes in the arc and O Twogas
Which reacts with Al in the Al-based plating andTwo
OThreeTo prevent Al from being mixed into the steel sheet
it is conceivable that. Here, the gist of the present invention is:
In arc welding of Al-based plated steel sheets, COTwoGas
Or Ar and COTwoIs used as shielding gas
It is characterized by performing MIG welding or MAG welding.
This is an arc welding method for an Al-based plated steel sheet.
【００１２】[0012]
【発明の実施の形態】次に、図面に基づいて、本発明に
かかるＡｌ系めっき鋼板のアーク溶接方法について、作
用とともに具体的に説明する。図１は、本発明にかかる
アーク溶接方法の説明図であり、ＭＩＧ溶接またはＭＡ
Ｇ溶接でＡｌ系めっき鋼板同士を溶接する方法について
示してある。図に示すように、ＭＩＧ溶接またはＭＡＧ
溶接すべきＡｌ系めっきが施された鋼板１同士を重ね合
わせ、この重ね合わせた部分を溶接トーチ２で隅肉溶接
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an arc welding method for an Al-based plated steel sheet according to the present invention will be described specifically with reference to the drawings. FIG. 1 is an explanatory view of an arc welding method according to the present invention.
It shows a method of welding Al-based plated steel sheets by G welding. As shown, MIG welding or MAG
The steel plates 1 to which Al plating is to be welded are overlapped with each other, and the overlapped portion is fillet welded with a welding torch 2.
【００１３】Ａｌ系めっき鋼板をＭＩＧ溶接する時のシ
ールドガス３としては、ＣＯ2 ガスを用いる。また、Ｍ
ＡＧ溶接する時のシールドガス３としては、ＡｒとＣＯ
2 が混合されたガスを用いる。シールドガスとして、い
ずれのガスを用いてもかまわないが、スパッターを出来
るだけ低減させるためには、ＣＯ2 ガスよりもＡｒとＣ
Ｏ2 が混合されたガスを用いた方が良い。また、Ａｒと
ＣＯ2 が混合されたガスにおいては、組成は特に問わな
いが、アークを安定化させ、スパッターを低減させる意
味から、１０〜３０％のＣＯ2 ガスが混合されたＡｒガ
スを用いることが望ましい。[0013] CO 2 gas is used as the shield gas 3 when MIG welding an Al-based plated steel sheet. Also, M
Ar and CO are used as shielding gas 3 for AG welding.
2 is used as a mixed gas. Any gas may be used as the shielding gas, but in order to reduce sputtering as much as possible, Ar and C are more preferable than CO 2 gas.
It is better to use a gas mixed with O 2 . The composition of the gas in which Ar and CO 2 are mixed is not particularly limited, but an Ar gas in which 10 to 30% of CO 2 gas is mixed is used from the viewpoint of stabilizing the arc and reducing spatter. It is desirable.
【００１４】本発明で用いるワイヤー４としては、Ａｌ
系めっき鋼板の母材に適した組成のワイヤーであればど
のようなものでも良い。また、他のめっき鋼板やめっき
パイプなどと溶接する場合には、それぞれの鋼板の組成
に適したワイヤーを選択すれば良い。ワイヤーの直径
は、板厚にもよるが、アークを安定化させ、Ａｌ系めっ
き鋼板の溶け落ちが起こらず、かつ、十分な溶け込みが
得られるように、０．６〜１．６ｍｍ程度の範囲内で選
択すれば良い。As the wire 4 used in the present invention, Al
Any wire may be used as long as it has a composition suitable for the base material of the system-plated steel sheet. When welding with another plated steel sheet or plated pipe, a wire suitable for the composition of each steel sheet may be selected. The diameter of the wire depends on the thickness of the wire, but is in the range of about 0.6 to 1.6 mm so as to stabilize the arc, prevent the Al-based plated steel sheet from being burnt out, and obtain sufficient penetration. You can select within.
【００１５】本発明におけるＡｌ系めっき鋼板として
は、純Ａｌめっき鋼板のほか、Ａｌ−Ｓｉ合金めっき鋼
板、Ａｌ−Ｍｎ合金めっき鋼板、Ａｌ−Ｚｎ合金めっき
鋼板、などが上げられる。Ａｌ系めっき層は、通常、溶
融めっき法で形成されるが、電気めっき法、蒸着法、溶
射法などの方法で形成しても良い。めっきの目付量とし
ては、片面で、３〜３００ｇ／ｍ2 程度のものを用いる
ことができる。また、Ａｌ系めっき鋼板とアーク溶接す
る他のめっき鋼板やパイプとしては、純Ｚｎめっき、Ｚ
ｎ−Ｆｅ系めっき、Ｚｎ−Ａｌ系めっき、Ｚｎ−Ｎｉ系
めっきなどのＺｎ系めっきが施されたものや、Ｓｎ系め
っき、Ｎｉ系めっき、Ｐｂ系めっき、などが施されたも
のが上げられる。これらのめっき層は、溶融めっき法、
電気めっき法、蒸着法、溶射法などのいずれの方法で形
成しても良い。めっきの目付量は、Ａｌ系めっきと同程
度のもので良い。Examples of the Al-based plated steel sheet in the present invention include a pure Al-plated steel sheet, an Al-Si alloy-plated steel sheet, an Al-Mn alloy-plated steel sheet, and an Al-Zn alloy-plated steel sheet. The Al-based plating layer is usually formed by a hot-dip plating method, but may be formed by a method such as an electroplating method, a vapor deposition method, or a thermal spraying method. The basis weight of plating may be about 3 to 300 g / m 2 on one side. Other plated steel sheets and pipes to be arc-welded with Al-based plated steel sheets include pure Zn plating and Z-plated steel.
Examples include those on which Zn-based plating such as n-Fe-based plating, Zn-Al-based plating, and Zn-Ni-based plating have been applied, and those on which Sn-based plating, Ni-based plating, Pb-based plating, and the like have been applied. . These plating layers are formed by hot-dip plating,
It may be formed by any method such as an electroplating method, a vapor deposition method, and a thermal spraying method. The basis weight of plating may be about the same as that of Al-based plating.
【００１６】[0016]
【実施例】以下、実施例によって、本発明を具体的に説
明する。 （実施例１）初めに、下記に示す３種類のＡｌ系めっき
鋼板（母材ＳＰＣＣ、引張強さ２９０ＭＰａ）を用い、
ＭＩＧ溶接とＭＡＧ溶接を実施した。図１に示したよう
に、試験片サイズが５０×３００×０．８ｍｍ（上板）
と１００×３００×０．８ｍｍ（下板）のＡｌ系めっき
鋼板同士を、同種のめっき鋼板同士の組み合わせで重ね
合わせ、ＭＩＧ溶接ではＣＯ2 ガスを、また、ＭＡＧ溶
接ではＡｒ＋２０％ＣＯ2 ガスをシールドガスに用い、
軟鋼用のワイヤーを用いて、表１に示した条件で長手方
向に溶接した。また、比較のため、シールドガスにＡｒ
ガスを用いて、ＴＩＧ溶接を行った。The present invention will be described below in detail with reference to examples. (Example 1) First, the following three types of Al-based plated steel sheets (base material SPCC, tensile strength 290 MPa) were used,
MIG welding and MAG welding were performed. As shown in FIG. 1, the test piece size is 50 × 300 × 0.8 mm (upper plate)
And 100 × 300 × 0.8 mm (lower plate) Al-based plated steel sheets are superimposed on each other in the combination of the same type of plated steel sheets. CO 2 gas is used for MIG welding, and Ar + 20% CO 2 gas is used for MAG welding. Used for shielding gas,
Using a mild steel wire, welding was performed in the longitudinal direction under the conditions shown in Table 1. For comparison, Ar gas was used as the shielding gas.
TIG welding was performed using gas.
【００１７】供試材 純Ａｌめっき鋼板；両面めっき材−目付量４ｇ／
ｍ2 、蒸着めっき Ａｌ−１０％Ｓｉめっき鋼板；両面めっき材−付着量
６０ｇ／ｍ2 、溶融めっき Ａｌ−２５％Ｍｎめっき鋼板；両面めっき材−付着量
２０ｇ／ｍ2 、電気めっき 溶接後、それぞれの試験片の断面組織観察を行い、溶接
部付近における結晶粒の粗大化状況を観察した。その結
果を表１に示す。なお、結晶粒の粗大化状況の評価は、
通常の裸鋼板同士を溶接した場合を基準に４段階で行
い、裸鋼板同士の場合を◎として、結晶粒が大きくなる
とともに、◎−○−△−×、と記した。Test material Pure Al-plated steel sheet; double-sided plated material-basis weight 4 g /
m 2 , vapor-deposited Al-10% Si plated steel sheet; double-sided plated material-adhesion amount 60 g / m 2 , hot-dip plated Al-25% Mn plated steel plate; double-sided plated material-adhesion amount 20 g / m 2 , electroplating The cross-sectional structure of each test piece was observed, and the state of coarsening of crystal grains near the weld was observed. Table 1 shows the results. The evaluation of the state of coarsening of the crystal grains
The process was performed in four steps based on the case where ordinary bare steel plates were welded, and the case where bare steel plates were welded was marked with ◎, and the crystal grain size was increased, and ◎ − ○ − △ − ×.
【００１８】[0018]
【表１】 [Table 1]
【００１９】表１からわかるように、シールドガスとし
てＣＯ2 ガスを用いたＭＩＧ溶接およびＡｒ＋２０％Ｃ
Ｏ2 ガスを用いたＭＡＧ溶接では、Ａｌ系めっき鋼板の
種類に関わらず、溶接部の結晶粒の大きさは裸鋼板同士
を溶接した場合と同レベルであり、結晶粒の粗大化は起
こっていなかった。一方、シールドガスとしてＡｒガス
を用いたＴＩＧ溶接では、いずれのＡｌ系めっき鋼板で
も、溶接部で結晶粒の粗大化が起こっていた。ＭＡＧ溶
接において、ＡｒとＣＯ2 ガスの組成を変化させても、
結果は同様であり、結晶粒の粗大化は起こっていなかっ
た。As can be seen from Table 1, MIG welding using CO 2 gas as a shielding gas and Ar + 20% C
In MAG welding using O 2 gas, regardless of the type of Al-plated steel sheet, the size of the crystal grains in the welded portion is at the same level as when bare steel sheets are welded to each other, and the crystal grains have become coarse. Did not. On the other hand, in TIG welding using Ar gas as a shielding gas, in any of the Al-based plated steel sheets, crystal grains were coarsened in the welded portions. In MAG welding, even if the composition of Ar and CO 2 gas is changed,
The results were similar, and no coarsening of the crystal grains occurred.
【００２０】（実施例２）実施例１において、Ａｌ系め
っき鋼板同士の組み合わせを同種材同士だけでなく、異
種材同士（例えば、と）で組み合わせても、結晶粒
の粗大化は起こっていなかった。また、図１に示した上
板側のめっき鋼板を、Ａｌ系めっき鋼板以外のめっき鋼
板、例えば、Ｚｎめっき鋼板、Ｚｎ−Ｆｅめっき鋼板、
Ｓｎ−１０％Ｚｎめっき鋼板、Ｎｉめっき鋼板、などに
代えても、下板側のＡｌ系めっき鋼板の溶接部で結晶粒
の粗大化は起こっていなかった。(Example 2) In Example 1, even if the combination of Al-based plated steel sheets is combined not only with the same kind of material but also with different kinds of material (for example, with), the crystal grains are not coarsened. Was. In addition, the plated steel sheet on the upper plate side shown in FIG. 1 is a plated steel sheet other than the Al-based plated steel sheet, for example, a Zn plated steel sheet, a Zn-Fe plated steel sheet,
Even when a Sn-10% Zn-plated steel sheet, a Ni-plated steel sheet, or the like was used, no coarsening of crystal grains occurred in the welded portion of the Al-based plated steel sheet on the lower plate side.
【００２１】（実施例３）次に、実施例１で作製した重
ね隅肉継手から、図２に示したような、幅３０ｍｍ、長
さ１００ｍｍの引張せん断試験片をそれぞれ３本ずつ切
り出し、引張速度０．１６ｍｍ／ｓで矢印６方向に荷重
をかけて引張試験を実施した。その結果、ＭＩＧ溶接お
よびＭＡＧ溶接を行った試験片では、Ａｌ系めっき鋼板
の種類に関わらず、いずれも溶接部から離れた母材の部
分７で破断した。一方、これに対して、ＴＩＧ溶接した
試験片では、いずれの場合も、溶接部付近の結晶粒が粗
大化した部分８で破断し、引張強さも、ＭＩＧ溶接およ
びＭＡＧ溶接した試験片に比べて、８０〜９５％程度の
値であった。(Example 3) Next, from the lap fillet joint prepared in Example 1, three tensile shear test pieces each having a width of 30 mm and a length of 100 mm as shown in FIG. A tensile test was performed by applying a load in the direction of arrow 6 at a speed of 0.16 mm / s. As a result, in each of the test pieces subjected to the MIG welding and the MAG welding, regardless of the type of the Al-based plated steel sheet, the fracture occurred at the portion 7 of the base material away from the weld. On the other hand, in the case of the TIG-welded test piece, on the other hand, in each case, the crystal grains near the welded portion fractured at the coarse portion 8, and the tensile strength was lower than that of the MIG- and MAG-welded test piece. , 80 to 95%.
【００２２】[0022]
【発明の効果】以上説明した通り、本発明によれば、Ａ
ｌ系めっき鋼板のアーク溶接において、結晶粒の粗大化
を起こさせることなく、高い継手強度（母材破断）を得
ることができる。したがって、これまで適用できなかっ
た自動車分野に対してもＡｌ系めっき鋼板を使用するこ
とが可能となる。この意味から、本発明の実用上の意義
は大きい。As described above, according to the present invention, A
In arc welding of l-plated steel sheets, high joint strength (base metal fracture) can be obtained without causing coarsening of crystal grains. Therefore, it is possible to use the Al-based plated steel sheet even in the automotive field, which has not been applicable up to now. In this sense, the present invention has great practical significance.
【図１】Ａｌ系めっき鋼板同士のＭＩＧ溶接とＭＡＧ溶
接を説明するための概略図である。FIG. 1 is a schematic diagram for explaining MIG welding and MAG welding between Al-based plated steel sheets.
【図２】引張せん断試験片を説明するための概略図であ
る。FIG. 2 is a schematic diagram illustrating a tensile shear test piece.
１ Ａｌ系めっき鋼板 ２ 溶接トーチ ３ シールドガス ４ 溶接ワイヤー ５ 溶接ビード ６ 荷重をかける方向 ７ 母材の破断部 ８ 溶接部の破断部 REFERENCE SIGNS LIST 1 Al-plated steel sheet 2 Welding torch 3 Shielding gas 4 Welding wire 5 Weld bead 6 Direction of applying load 7 Base metal break 8 Weld break
Claims (1)
て、ＣＯ2 ガスまたはＡｒとＣＯ2 が混合されたガスを
シールドガスに用い、ＭＩＧ溶接またはＭＡＧ溶接を行
うことを特徴とするＡｌ系めっき鋼板のアーク溶接方
法。In an arc welding of an Al-based plated steel sheet, MIG welding or MAG welding is performed by using CO 2 gas or a mixed gas of Ar and CO 2 as a shielding gas. Arc welding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10355262A JP2000176644A (en) | 1998-12-15 | 1998-12-15 | ARC WELDING METHOD OF Al BASE PLATED STEEL SHEET |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10355262A JP2000176644A (en) | 1998-12-15 | 1998-12-15 | ARC WELDING METHOD OF Al BASE PLATED STEEL SHEET |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000176644A true JP2000176644A (en) | 2000-06-27 |
Family
ID=18442916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10355262A Withdrawn JP2000176644A (en) | 1998-12-15 | 1998-12-15 | ARC WELDING METHOD OF Al BASE PLATED STEEL SHEET |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000176644A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1676663A2 (en) * | 2003-06-26 | 2006-07-05 | Linde Aktiengesellschaft | Shielding gases and methods for gas-shielded metal arc welding with polarity changing |
| KR100743025B1 (en) * | 2001-08-23 | 2007-07-26 | 주식회사 포스코 | Method for manufac turing lpg container by mig welding providing enhanced corrosion resistance in the welded parts |
| CN110253165A (en) * | 2019-05-21 | 2019-09-20 | 安徽工程大学 | A kind of steel aluminium joint welder |
| CN110253166A (en) * | 2019-05-21 | 2019-09-20 | 安徽工程大学 | A kind of device for eliminating aluminum steel dissimilar metal weld crack and stomata |
| CN112756747A (en) * | 2021-01-06 | 2021-05-07 | 陈潮强 | Welding process of aluminum magnesium alloy plate |
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-
1998
- 1998-12-15 JP JP10355262A patent/JP2000176644A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100743025B1 (en) * | 2001-08-23 | 2007-07-26 | 주식회사 포스코 | Method for manufac turing lpg container by mig welding providing enhanced corrosion resistance in the welded parts |
| EP1676663A2 (en) * | 2003-06-26 | 2006-07-05 | Linde Aktiengesellschaft | Shielding gases and methods for gas-shielded metal arc welding with polarity changing |
| EP1676663A3 (en) * | 2003-06-26 | 2006-07-26 | Linde Aktiengesellschaft | Shielding gases and methods for gas-shielded metal arc welding with polarity changing |
| CN110253165A (en) * | 2019-05-21 | 2019-09-20 | 安徽工程大学 | A kind of steel aluminium joint welder |
| CN110253166A (en) * | 2019-05-21 | 2019-09-20 | 安徽工程大学 | A kind of device for eliminating aluminum steel dissimilar metal weld crack and stomata |
| CN112756747A (en) * | 2021-01-06 | 2021-05-07 | 陈潮强 | Welding process of aluminum magnesium alloy plate |
| CN113500275A (en) * | 2021-07-22 | 2021-10-15 | 南京航空航天大学 | GMAW (gas metal arc welding) welding process for improving formation and performance of high-speed electric arc lap welding seam of sheet steel |
| CN113500275B (en) * | 2021-07-22 | 2022-06-21 | 南京航空航天大学 | GMAW (gas metal arc welding) welding process for improving formation and performance of high-speed electric arc lap welding seam of sheet steel |
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