JP3333423B2 - Seam welding method for fuel tank made of resin-coated aluminum-based steel sheet - Google Patents
Seam welding method for fuel tank made of resin-coated aluminum-based steel sheetInfo
- Publication number
- JP3333423B2 JP3333423B2 JP8129197A JP8129197A JP3333423B2 JP 3333423 B2 JP3333423 B2 JP 3333423B2 JP 8129197 A JP8129197 A JP 8129197A JP 8129197 A JP8129197 A JP 8129197A JP 3333423 B2 JP3333423 B2 JP 3333423B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- steel sheet
- fuel tank
- coated
- coating layer
- 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 - Fee Related
Links
Landscapes
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Coating With Molten Metal (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、優れたプレス成形
性、耐食性を兼備する樹脂被覆Ａｌ系めっき鋼板を用い
て自動車の燃料タンクを製造する際の適切なシーム溶接
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an appropriate seam welding method for manufacturing a fuel tank of an automobile using a resin-coated Al-based steel sheet having both excellent press formability and corrosion resistance.
【０００２】[0002]
【従来の技術】自動車の燃料タンクは複雑な形状を有す
る場合が多いことから優れた加工性(深絞り特性)が要求
される。また、自動車の重要保安部品であるため、その
使用材料には、フィルター目詰まりにつながるような腐
食生成物が無く、穴あき腐食の懸念のない材料で、しか
も容易に安定して溶接できる材料であることが重要であ
る。これら様々な特性を有する材料として、Ｐｂ−Ｓｎ
合金めっき鋼板（特公昭５７−６１８３３号公報）が自
動車燃料タンク素材として幅広く使用されてきている。
この材料はガソリンに対して安定な化学的性質を有し、
かつめっきが潤滑性に優れるためプレス成形性に優れ、
また、スポット溶接やシーム溶接等の抵抗溶接性にも優
れている。しかし、近年環境への負荷という意味から鉛
を使用しない材料が求められている。2. Description of the Related Art In many cases, a fuel tank of an automobile has a complicated shape, so that excellent workability (deep drawing property) is required. In addition, since it is an important safety component for automobiles, the material used is free from corrosion products that could lead to filter clogging, free from concerns about perforated corrosion, and a material that can be easily and stably welded. It is important that there is. Materials having these various properties include Pb-Sn
Alloy plated steel sheets (Japanese Patent Publication No. 57-61833) have been widely used as a material for automobile fuel tanks.
This material has stable chemistry to gasoline,
In addition, since the plating is excellent in lubricity, it is excellent in press formability,
It is also excellent in resistance weldability such as spot welding and seam welding. However, in recent years, materials that do not use lead have been demanded from the viewpoint of load on the environment.
【０００３】この様なＰｂを使用せず、良好な耐食性及
び加工性を有する素材の一つがＡｌ系のめっき鋼板であ
る。Ａｌはその表面に安定な酸化皮膜が形成されるた
め、ガソリンを始めとして、アルコールや、ガソリンが
劣化した際に生じる有機酸に対し、良好な耐食性を示
す。しかしながら、Ａｌめっき鋼板を燃料タンクに製造
する際に、課題となるのが溶接性である。被覆金属のＡ
ｌは通常電極として使用されるＣｕとの親和性が高く、
溶接時に電極表面に脆いＡｌ−ＣｕもしくはＡｌ−Ｃｕ
−Ｆｅ合金を形成し、これが連続作業中に次第に欠損し
ていって早期に溶接不良に陥るといった問題を有してい
る。[0003] One of the materials which does not use such Pb and has good corrosion resistance and workability is an Al-based plated steel sheet. Since Al forms a stable oxide film on its surface, it exhibits good corrosion resistance to gasoline, alcohol, and organic acids generated when gasoline is deteriorated. However, when manufacturing an Al-plated steel sheet into a fuel tank, the problem is weldability. A of coated metal
l has a high affinity for Cu which is usually used as an electrode,
Al-Cu or Al-Cu brittle on electrode surface during welding
-There is a problem that an Fe alloy is formed, which is gradually broken during continuous operation, resulting in early welding failure.
【０００４】従来、Ａｌ系めっき鋼板は、耐食性を向上
させる目的で一般にクロム酸とシリカを主体とするクロ
メート処理を施して用いられており、その開示例として
は、例えば特公平４−６８３９９号公報、特開昭５８−
６９７６号公報、特開昭５８−４８６７９号公報、特開
昭６０−５６０７２号公報がある。しかし、これらの方
法は、いずれも電極との反応が無処理材の場合とそれほ
ど変わらず生じ、連続作業性向上にはあまり寄与しな
い。特公平４−６８３９９号公報はＣｒ換算で３５〜７
０ｍｇ／ｍ2 形成させることを特徴としているが、この
付着量では燃料タンクとしての耐食性は得られるもの
の、スポット溶接やシーム溶接において、無処理材と同
様めっき層中のＡｌが電極Ｃｕと合金化し易く、連続作
業中に電極先端が合金化し、電極寿命を低下させるとい
った欠点がある。[0004] Conventionally, Al-based plated steel sheets are generally used after being subjected to a chromate treatment mainly composed of chromic acid and silica for the purpose of improving corrosion resistance. For example, Japanese Patent Publication No. 4-68399 discloses the disclosed example. JP-A-58-
6976, JP-A-58-48679, and JP-A-60-56072. However, in these methods, the reaction with the electrode occurs in the same manner as in the case of the untreated material, and does not contribute much to the improvement of the continuous workability. Japanese Patent Publication No. 4-68399 discloses that the Cr equivalent is 35-7.
Although it is characterized by forming 0 mg / m 2, although the corrosion resistance as a fuel tank can be obtained with this amount of adhesion, in the spot welding or seam welding, the Al in the plating layer is alloyed with the electrode Cu like the untreated material. This is disadvantageous in that the end of the electrode is easily alloyed during continuous operation and the life of the electrode is shortened.
【０００５】また、特開昭５８−６９７６号公報、特開
昭５８−４８６７９号公報では５〜４０ｍｇ／ｍ2 のク
ロメート付着量を特徴とする例が開示され、特開昭６０
−５６０７２号公報ではクロメート付着量１０ｍｇ／ｍ
2 未満を特徴とする例が開示されているが、特公平４−
６８３９９号公報と同様抵抗溶接性に問題がある。その
ため、これら従来技術では燃料タンク製造時に要求され
る良好な抵抗溶接性、連続作業性を満たすことが困難な
のが現状であった。Further, JP-A-58-6976 and JP-A-58-48679 disclose examples characterized by a chromate adhesion amount of 5 to 40 mg / m 2.
No. 56072 discloses a chromate adhesion amount of 10 mg / m.
Although an example characterized by less than 2 is disclosed,
There is a problem in resistance weldability as in JP-A-68399. Therefore, it has been difficult at present to satisfy satisfactory resistance weldability and continuous workability required in the production of fuel tanks with these conventional techniques.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、従来のＡｌ
めっき鋼板では適用が困難であった燃料タンク用防錆鋼
板に対し、課題である抵抗溶接性を改善し、かつ良好な
連続作業性を達成できるシーム溶接方法を提供する事を
目的とする。SUMMARY OF THE INVENTION The present invention relates to a conventional Al
It is an object of the present invention to provide a seam welding method that can improve resistance welding property, which is a problem, and achieve good continuous workability for a rust-preventive steel sheet for a fuel tank, which has been difficult to apply with a plated steel sheet.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、抵抗溶接
性に優れ、連続作業可能なＡｌめっき鋼板の表面処理及
び溶接方法を種々検討した結果、片面もしくは両面に樹
脂被覆層もしくはクロメート含有する樹脂被覆層をＡｌ
系めっき鋼板に形成すること、及びその鋼板を適正な組
合せ方で溶接することにより、前述した溶接時の課題を
解決するとともに、連続作業性が格段に向上することを
見出した。具体的には、鋼板の片面または両面に、Ａｌ
及び不可避的不純物、またはＳｉを２重量％〜１３重量
％含有し残部Ａｌ及び不可避的不純物からなるめっき層
を形成し、さらにその片面または両面にＣｒ量換算で１
０〜２００ｍｇ／ｍ 2 のクロメートを含む樹脂被覆層を
形成した樹脂被覆Ａｌ系めっき鋼板を２枚重ねて一対の
電極輪の間でシーム溶接するにあたって、少なくとも燃
料タンクの内面に相当する面がＡｌ系めっき層を有し、
かつ鋼板どうし重なった面の少なくとも片方の鋼板表面
に樹脂被覆層を有すること。The present inventors have conducted various studies on the surface treatment and welding method of an Al-plated steel sheet which is excellent in resistance weldability and can be continuously worked. As a result, one side or both sides contains a resin coating layer or a chromate-containing layer. Resin coating layer
It has been found that, by forming a system-plated steel sheet and welding the steel sheet in an appropriate combination, the above-mentioned problem at the time of welding is solved and continuous workability is remarkably improved. Specifically, on one or both sides of a steel plate, Al
And a plating layer containing 2 to 13% by weight of inevitable impurities or Si and a balance of Al and inevitable impurities is formed, and one or both surfaces thereof have a Cr content of 1%.
When two resin-coated Al-based plated steel sheets each having a resin coating layer containing 0 to 200 mg / m 2 chromate are overlapped and seam-welded between a pair of electrode rings, at least a surface corresponding to the inner surface of the fuel tank is made of aluminum. Having a system plating layer,
In addition, a resin coating layer must be provided on at least one of the steel sheet surfaces on which the steel sheets overlap.
【０００８】もしくは、鋼板の片面または両面に、Ａｌ
及び不可避的不純物、またはＳｉを２重量％〜１３重量
％含有し残部Ａｌ及び不可避的不純物からなるめっき層
を形成し、さらにその片面または両面にＣｒ量換算で１
０〜２００ｍｇ／ｍ 2 のクロメートを含む樹脂被覆層を
形成した樹脂被覆Ａｌ系めっき鋼板を２枚重ねて一対の
電極輪の間でシーム溶接するにあたって、少なくとも燃
料タンクの内面に相当する面がＡｌ系めっき層を有し、
かつ電極輪と接する面のいずれか片方が樹脂被覆層を有
すること。[0008] Alternatively, on one or both sides of a steel plate,
And a plating layer containing 2 to 13% by weight of inevitable impurities or Si and a balance of Al and inevitable impurities is formed, and one or both surfaces thereof have a Cr content of 1%.
When two resin-coated Al-based plated steel sheets each having a resin coating layer containing 0 to 200 mg / m 2 chromate are overlapped and seam-welded between a pair of electrode rings, at least a surface corresponding to the inner surface of the fuel tank is made of aluminum. Having a system plating layer,
One of the surfaces in contact with the electrode ring has a resin coating layer.
【０００９】もしくは、鋼板の片面または両面に、Ａｌ
及び不可避的不純物、またはＳｉを２重量％〜１３重量
％含有し残部Ａｌ及び不可避的不純物からなるめっき層
を形成し、さらにその片面または両面にＣｒ量換算で１
０〜２００ｍｇ／ｍ 2 のクロメートを含む樹脂被覆層を
形成した樹脂被覆Ａｌ系めっき鋼板を２枚重ねて一対の
電極輪の間でシーム溶接するにあたって、少なくとも燃
料タンクの内面に相当する面がＡｌ系めっき層を有し、
かつ電極輪と接する面の両方が樹脂被覆層を有するこ
と、もしくは鋼板どうし重なった面の少なくとも片方の
鋼板表面に樹脂被覆層を有すること、好ましくは樹脂被
覆層が、Ｃｒ量換算で８０〜１４０ｍｇ／ｍ2 のクロメ
ートを含むこと、もしくは樹脂被覆層の厚みが０．１〜
２μｍであること、もしくはアルミ系めっき層の付着量
が１０ｇ／ｍ2 〜５０ｇ／ｍ2 であることを特徴とす
る。Alternatively, on one or both sides of a steel plate, Al
And a plating layer containing 2 to 13% by weight of inevitable impurities or Si and a balance of Al and inevitable impurities is formed, and one or both surfaces thereof have a Cr content of 1%.
When two resin-coated Al-based plated steel sheets each having a resin coating layer containing 0 to 200 mg / m 2 chromate are overlapped and seam-welded between a pair of electrode rings, at least a surface corresponding to the inner surface of the fuel tank is made of aluminum. Having a system plating layer,
And both of the surfaces in contact with the electrode rings have a resin coating layer, or have a resin coating layer on at least one steel plate surface of the overlapping surfaces of the steel plates, preferably the resin coating layer is 80 to 140 mg in terms of Cr amount / M 2 , or the thickness of the resin coating layer is 0.1 to
It is 2 [mu] m, or the amount of deposition of the aluminum-based plating layer is characterized in that it is a 10g / m 2 ~50g / m 2 .
【００１０】以下に本発明を詳細に説明する。前述した
ように、鋼板被覆金属のＡｌは電極のＣｕと反応しやす
く、電極損耗を早め連続作業性を低下させるといった問
題点を有している。よって、連続作業性を向上させるた
めには、電極損耗を抑制すること、及び効率的なナゲッ
トを形成させるため鋼板間の接触抵抗値を増大させるこ
と、の２点が重要になる。本発明者らはこれらの目的に
対し、片面もしくは両面に樹脂被覆層をＡｌ系めっき鋼
板に形成すること、及びその鋼板を適正な組合せ方で溶
接することが良好な抵抗溶接性確保と連続作業性向上に
有効に作用することを見出し、本発明を完成させた。Hereinafter, the present invention will be described in detail. As described above, Al in the metal coated with the steel sheet easily reacts with Cu of the electrode, and has a problem that electrode wear is accelerated and continuous workability is reduced. Therefore, in order to improve the continuous workability, two important points are to suppress the electrode wear and to increase the contact resistance value between the steel plates to form an efficient nugget. For these purposes, the present inventors have found that forming a resin coating layer on one or both sides of an Al-based plated steel sheet, and welding the steel sheet in an appropriate combination, ensures good resistance weldability and continuous work. The present inventors have found that the present invention effectively works to improve the performance, and completed the present invention.
【００１１】すなわち、図１に示すように、鋼板間に樹
脂皮膜面が存在する場合、鋼板間の接触抵抗値は高くな
っている。したがって、樹脂被覆面を鋼板間に配置する
ことにより、鋼板間の接触抵抗値は向上するため、発熱
促進による良好なナゲット形成が期待できる。また、鋼
板−電極間に樹脂皮膜面が存在する場合、間に皮膜が1
層存在するにも関わらず無処理材とほとんど変わらない
抵抗値を示す。したがって、鋼板−電極側に樹脂被覆面
を配置することにより、皮膜の保護作用による電極損耗
抑制効果が期待できる。これは、樹脂が軟質で強靱な皮
膜を形成するため加圧時に均一な薄層化が可能であり、
均一な通電点形成を生じることによると考えられる。こ
れらの作用は、鋼板どうし重なった面の少なくとも一方
の鋼板表面に樹脂皮膜が存在すること、もしくは鋼板が
電極輪と接する面に樹脂皮膜が存在していれば効果が期
待できる。両面処理の場合はこれらの効果が加味され、
さらに効果大となる。That is, as shown in FIG. 1, when a resin film surface exists between steel plates, the contact resistance value between the steel plates is high. Therefore, by arranging the resin-coated surface between the steel plates, the contact resistance value between the steel plates is improved, so that good nugget formation by promoting heat generation can be expected. If a resin film surface exists between the steel plate and the electrode,
The resistance value is almost the same as that of the untreated material despite the existence of the layer. Therefore, by arranging the resin-coated surface on the steel plate-electrode side, an effect of suppressing electrode wear due to the protective action of the film can be expected. This is because the resin forms a soft and tough film, which enables uniform thinning during pressurization.
This is considered to be caused by the formation of a uniform current-carrying point. These effects can be expected if a resin film is present on at least one of the steel sheet surfaces where the steel sheets overlap, or if a resin film is present on the surface of the steel sheet in contact with the electrode wheel. In the case of double-sided treatment, these effects are taken into account,
The effect is further enhanced.
【００１２】上記のような効果を発現する樹脂被覆量と
して、膜厚で０．１μｍ以上２μｍ以下とする。０．１
μｍ未満では抵抗溶接性への寄与が充分でなく、２μｍ
超では、両面処理の場合鋼板間で４μｍ以上となり、接
触抵抗値が高くなりすぎ、通電不良等を生じる。本発明
で用いる樹脂としては、水溶性及び溶剤系のどちらの樹
脂でも可能である。例えばポリアクリル酸とその共重化
合物、マレイン酸共重化合物、酢酸ビニル共重化合物、
ポリエチレン化合物、ポリウレタン化合物、エポキシ樹
脂化合物等が使用される。これらの樹脂は、主として単
独で添加、使用されるが、二種以上を複合添加して使用
しても構わない。[0012] The resin coating amount that exerts the above-mentioned effects is 0.1 μm or more and 2 μm or less in film thickness. 0.1
If less than μm, the contribution to resistance weldability is not sufficient, and
If it is more than 2 μm, the thickness between the steel plates becomes 4 μm or more in the case of the double-sided treatment, and the contact resistance value becomes too high, which results in poor conduction. As the resin used in the present invention, any of a water-soluble resin and a solvent-based resin can be used. For example, polyacrylic acid and its co-polymer, maleic acid co-polymer, vinyl acetate co-polymer,
Polyethylene compounds, polyurethane compounds, epoxy resin compounds and the like are used. These resins are mainly added and used alone, but two or more of them may be used in combination.
【００１３】また、樹脂皮膜単独でも十分な効果を発揮
するが、特に樹脂系が水溶性の場合、クロム酸を主成分
とするクロメート処理液を複合添加した処理液を塗布
し、有機と無機の複合皮膜を形成することにより、上記
と同様良好な抵抗溶接性が得られ、かつ良好な耐食性も
得られる。このクロム酸添加量は、Ｃｒ量換算で１０ｍ
ｇ／ｍ2 以上２００ｍｇ／ｍ2 以下とする。１０ｍｇ／
ｍ2 未満ではその添加効果は不十分であり、１０ｍｇ／
ｍ2 以上の付着量で燃料タンクとしての耐食性、及び抵
抗溶接性を有するようになるが、７０ｍｇ／ｍ2 超では
抵抗溶接性がさらに良好となる。一方、付着量が２００
ｍｇ／ｍ2 超では皮膜中に占める無機物の比率を増大さ
せ、耐食性は良好となるものの、局部過大通電が生じや
すくなり、連続作業性を低下させる等の問題を生じる。
好ましくは１４０ｍｇ／ｍ2 以下である。従ってこれら
の観点から、本発明者らはその範囲を１０ｍｇ／ｍ2 以
上２００ｍｇ／ｍ2 以下、さらに好ましくは８０ｍｇ／
ｍ2 以上１４０ｍｇ／ｍ2 以下とする。 これら樹脂と
クロメートとの複合処理液には、さらに耐食性、塗料密
着性、均一被覆性を向上させるために、シリカ、リン酸
を添加することも可能である。Although a resin film alone can provide a sufficient effect, particularly when the resin system is water-soluble, a treatment solution containing a complex addition of a chromate treatment solution containing chromic acid as a main component is applied to form an organic and inorganic solution. By forming the composite film, good resistance weldability and good corrosion resistance can be obtained as described above. The amount of chromic acid added is 10 m in terms of Cr amount.
g / m 2 or more and 200 mg / m 2 or less. 10mg /
If less than m 2 , the effect of the addition is insufficient, and 10 mg /
When the adhesion amount is at least m 2 , the fuel tank has corrosion resistance and resistance weldability, but when it exceeds 70 mg / m 2 , resistance weldability is further improved. On the other hand, when the adhesion amount is 200
If it exceeds mg / m 2 , the ratio of the inorganic substance occupying in the film is increased, and the corrosion resistance is improved. However, local excessive current is likely to occur, causing problems such as a decrease in continuous workability.
Preferably it is 140 mg / m 2 or less. Therefore, from these viewpoints, the present inventors set the range from 10 mg / m 2 to 200 mg / m 2 , more preferably 80 mg / m 2.
m 2 or more and 140 mg / m 2 or less. Silica and phosphoric acid can be added to the composite treatment liquid of these resins and chromate in order to further improve the corrosion resistance, paint adhesion and uniform coverage.
【００１４】本発明においては、めっきの後工程で上記
の樹脂被覆層形成を行うものであるが、その製造方法
は、塗布、浸漬、スプレーなど公知の方法で可能であ
る。次に、めっき層の限定理由を説明する。めっき被覆
層中のＳｉ添加量であるが、この元素は通常合金層を薄
くする目的から１０重量％程度添加されている。溶融Ａ
ｌめっきで生成する合金層は非常に硬質で、かつ脆性で
あるために破壊の起点となりやすく、鋼板自体の延性も
阻害する。通常の２〜３μｍ程度の合金層でも延性は３
ポイント程度低下する。したがって、この合金層は薄け
れば薄いほど加工に対して有利に働く。Ｓｉは２重量％
以上添加しないと合金層低減効果が薄く、また１３重量
％を越えるとその効果が飽和することに加えてＳｉが電
気化学的にカソードとなりやすい事からＳｉ量の増加は
めっき層の耐食性劣化につながる。このためＳｉ量は２
〜１３重量％に限定する。In the present invention, the above-described resin coating layer is formed in a post-plating step, and the production method can be a known method such as coating, dipping, or spraying. Next, the reasons for limiting the plating layer will be described. The amount of Si added to the plating coating layer is usually about 10% by weight for the purpose of thinning the alloy layer. Melt A
Since the alloy layer formed by plating is very hard and brittle, it tends to be a starting point of fracture, and also impairs the ductility of the steel sheet itself. The ductility is 3 even with a normal alloy layer of about 2-3 μm.
About a point. Therefore, the thinner this alloy layer is, the better it works for processing. Si is 2% by weight
If not added, the effect of reducing the alloy layer is thin, and if it exceeds 13% by weight, the effect is saturated, and in addition, Si is easily electrochemically used as a cathode, so an increase in the amount of Si leads to deterioration of the corrosion resistance of the plating layer. . Therefore, the amount of Si is 2
Limited to ~ 13% by weight.
【００１５】Ａｌ系めっき被覆層の製造方法は、溶融め
っき、溶融塩電解、蒸着等、公知の方法で可能である。
また、一般にめっき付着量が増大すると耐食性は向上す
るが、めっき密着性、溶接性は低下する。種々の溶接を
必要とする燃料タンク材にＡｌ系めっき鋼板を適用する
場合においては、溶接性の確保が重要であることから付
着量の上限を片面５０ｇ／ｍ2 とする。望ましくは片面
４０ｇ／ｍ2 以下である。また、１０ｇ／ｍ2 未満では
燃料タンク内面側の耐食性が不十分であるため、Ａｌ系
めっき層の付着量を片面あたり１０ｇ／ｍ2 〜５０ｇ／
ｍ2 、望ましくは１０ｇ／ｍ2 〜４０ｇ／ｍ2 とする。
Ａｌめっきのそれ以外の条件については特に限定するも
のではない。しかし、合金層厚みは厚くなると加工特性
を低下させるため薄い方が好ましい。The method for producing the Al-based plating coating layer can be a known method such as hot-dip plating, molten salt electrolysis, and vapor deposition.
In general, as the amount of plating increases, corrosion resistance improves, but plating adhesion and weldability decrease. In the case where an Al-based plated steel sheet is applied to a fuel tank material that requires various types of welding, the upper limit of the amount of adhesion is set to 50 g / m 2 on one side because it is important to ensure weldability. Desirably, it is 40 g / m 2 or less on one side. If the amount is less than 10 g / m 2 , the corrosion resistance on the inner surface side of the fuel tank is insufficient, so that the adhesion amount of the Al-based plating layer per one side is 10 g / m 2 to 50 g / m 2 .
m 2, preferably to 10g / m 2 ~40g / m 2 .
Other conditions of the Al plating are not particularly limited. However, as the thickness of the alloy layer increases, the processing characteristics deteriorate.
【００１６】使用するめっき原板の組成については特に
限定するものではない。しかし、高度な加工性を要求さ
れる部位だけに、加工性に優れたＩＦ鋼の適用が望まし
く、さらには溶接後の気密性、二次加工性等を確保する
ためにＢを数ｐｐｍ添加した鋼板が望ましい。また、鋼
板の製造法としては通常の方法によるものとする。鋼成
分は例えば転炉−真空脱ガス処理により調節され溶製さ
れ、鋼片は連続鋳造法で製造され、熱間圧延される。熱
間圧延、またそれに続く冷間圧延の条件は鋼板の深絞り
性に影響を与える。特に優れた深絞り性を付与するため
には、熱延時の加熱温度を１１５０℃程度と低めに、ま
た、熱延の仕上温度は８００℃程度と低めに巻取温度は
６００℃以上と高めに、冷延の圧下率は８０％程度と高
めに設定するのが良い。The composition of the plating base plate to be used is not particularly limited. However, it is desirable to apply IF steel excellent in workability only to the parts where high workability is required, and furthermore, B is added by several ppm to secure airtightness after welding, secondary workability, and the like. Steel plates are preferred. In addition, a normal steel plate manufacturing method is used. The steel component is adjusted and melted by, for example, a converter-vacuum degassing process, and the steel slab is manufactured by a continuous casting method and hot-rolled. The conditions of hot rolling and subsequent cold rolling affect the deep drawability of the steel sheet. In order to impart particularly excellent deep drawability, the heating temperature during hot rolling should be as low as about 1150 ° C, the finishing temperature of hot rolling should be as low as about 800 ° C, and the winding temperature should be as high as 600 ° C or more. The rolling reduction of the cold rolling is preferably set as high as about 80%.
【００１７】次に実施例により本発明をさらに詳細に説
明する。Next, the present invention will be described in more detail with reference to examples.
【実施例】表１に示す成分の鋼を通常の転炉−真空脱ガ
ス処理により溶製し、鋼片とした後、通常の条件で熱間
圧延、冷延を行い、冷延鋼板（板厚０．８ｍｍ）を得
た。これを材料として溶融Ａｌめっきを行った。溶融Ａ
ｌめっきは無酸化炉−還元炉型のラインを使用し、焼鈍
もこの溶融めっきライン内で行った。焼鈍温度は８００
〜８５０℃とした。めっき後ガスワイピング法でめっき
付着量を調節した。この際のめっき温度は６６０℃と
し、めっき浴組成としては基本的にＡｌ−２％Ｆｅと
し、これにＳｉを添加した。この浴中のＦｅは浴中のめ
っき機器やストリップから供給されるものである。この
両面Ａｌめっき材の片面をベルダー研削することにより
片面被覆材も作製した。こうして製造した各種Ａｌ系め
っき鋼板に各種処理液をロールコーターもしくは浸漬後
のリンガーロールにより所定の付着量塗布し、２００℃
の温風にて焼付乾燥を行った。それらの樹脂被覆Ａｌ系
めっき鋼板のシーム溶接性を下記に示す方法により評価
した。その結果を表２に示す。EXAMPLES Steel having the components shown in Table 1 was melted by a normal converter-vacuum degassing process to obtain billets, which were then hot-rolled and cold-rolled under normal conditions to obtain cold-rolled steel sheets (sheets). 0.8 mm). Using this as a material, hot-dip Al plating was performed. Melt A
The l-plating was performed using a line of a non-oxidizing furnace-reducing furnace type, and the annealing was also performed in the hot-dip plating line. Annealing temperature is 800
~ 850 ° C. After plating, the amount of plating was adjusted by a gas wiping method. The plating temperature at this time was 660 ° C., and the plating bath composition was basically Al-2% Fe, to which Si was added. The Fe in the bath is supplied from plating equipment or strips in the bath. A single-sided coated material was also prepared by subjecting one side of this double-sided Al-plated material to bevel grinding. A variety of treatment liquids were applied to the various Al-plated steel sheets manufactured in this manner by a roll coater or a ringer roll after immersion in a predetermined amount, and the temperature was 200 ° C.
Baking and drying with warm air. The seam weldability of these resin-coated Al-based plated steel sheets was evaluated by the following method. Table 2 shows the results.
【００１８】[0018]
【表１】 [Table 1]
【００１９】（１）シーム溶接性評価 Ｒ６ｍｍ−φ２５０ｍｍの電極輪を用い、溶接電流１３
ｋＡ、加圧力４００ｋｇ、通電２ｏｎ−２ｏｆｆで１０
ｍのシーム溶接を行った後、ＪＩＳ−Ｚ−３１４１に示
す試験片を作製し、漏れ試験を実施すると共に、断面溶
け込み部状況、電極表面の汚染状況を観察した。 ◎：漏れ無し(溶け込み部良好、電極表面の汚れほとん
どなし) ○：漏れ無し(溶け込み部良好、電極表面の汚れ小) △：漏れ無し(溶け込み部良好、電極表面の汚れ大) ×：漏れ発生(穴あき多数もしくは溶け込み不良、電極
表面の汚れ大) 表２に示すように、本発明ではいずれも良好なシーム溶
接性を示す。(1) Evaluation of seam weldability Using an electrode wheel of R6 mm-φ250 mm, welding current 13
kA, pressure 400kg, energization 2on-2off, 10
After performing the seam welding of m, a test piece shown in JIS-Z-3141 was prepared, a leakage test was performed, and a cross-section penetration state and a contamination state of the electrode surface were observed. ：: no leakage (good penetration, almost no electrode surface contamination) ○: no leakage (good penetration, small electrode surface contamination) △: no leakage (good penetration, large electrode surface contamination) ×: leakage occurred (Many holes or poor penetration, large contamination on the electrode surface) As shown in Table 2, the present invention shows good seam weldability.
【００２０】[0020]
【表２】 [Table 2]
【００２１】[0021]
【発明の効果】本発明は、自動車燃料タンク素材として
必要なシーム溶接方法を提供したものであり、今後Ｐｂ
系材料が環境問題で使用が困難になったときに、新しい
タンク素材及びその製造方法として非常に有望であり、
産業上の寄与も大きい。The present invention provides a seam welding method required as a fuel tank material for automobiles.
When the system material becomes difficult to use due to environmental problems, it is very promising as a new tank material and its manufacturing method,
The industrial contribution is also large.
【図１】各種樹脂被覆材及び無処理材の接触抵抗値を示
した図である。FIG. 1 is a diagram showing contact resistance values of various resin coating materials and untreated materials.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ２３Ｃ 28/00 Ｂ６０Ｋ 15/02 Ａ (56)参考文献 特開 平７−284952（ＪＰ，Ａ) 特開 平３−60876（ＪＰ，Ａ) 特開 平５−228641（ＪＰ，Ａ) 特開 平６−210792（ＪＰ，Ａ) 特開 平10−95436（ＪＰ，Ａ) 特開 昭59−104279（ＪＰ，Ａ) 特開 平９−239549（ＪＰ，Ａ) 特公 平４−68399（ＪＰ，Ｂ２) 実公 昭52−55466（ＪＰ，Ｙ２) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 9/022 B23K 11/06 B23K 11/16 B60K 15/03 C23C 2/12 C23C 28/00 ──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. 7 Identification symbol FI C23C 28/00 B60K 15/02 A (56) References JP-A-7-284852 (JP, A) JP-A-3-60876 ( JP, A) JP-A-5-228641 (JP, A) JP-A-6-210792 (JP, A) JP-A-10-95436 (JP, A) JP-A-59-104279 (JP, A) 9-239549 (JP, A) JP 4-68399 (JP, B2) JT 52-55466 (JP, Y2) (58) Fields studied (Int. Cl. 7 , DB name) B23K 9 / 022 B23K 11/06 B23K 11/16 B60K 15/03 C23C 2/12 C23C 28/00
Claims (6)
避的不純物、またはＳｉを２重量％〜１３重量％含有し
残部Ａｌ及び不可避的不純物からなるめっき層を形成
し、さらにその片面または両面にＣｒ量換算で１０〜２
００ｍｇ／ｍ 2 のクロメートを含む樹脂被覆層を形成し
た樹脂被覆Ａｌ系めっき鋼板を２枚重ねて一対の電極輪
の間でシーム溶接するにあたって、少なくとも燃料タン
クの内面に相当する面がＡｌ系めっき層を有し、かつ鋼
板どうし重なった面の少なくとも片方の鋼板表面に樹脂
被覆層を有することを特徴とする樹脂被覆Ａｌ系めっき
鋼板製燃料タンクのシーム溶接方法。1. A plating layer containing Al and inevitable impurities or Si in an amount of 2 to 13% by weight and a balance of Al and inevitable impurities is formed on one or both surfaces of a steel sheet, and further on one or both surfaces thereof. 10 to 2 in terms of Cr amount
When two resin-coated Al-based plated steel sheets having a resin coating layer containing 00 mg / m 2 chromate are overlapped and seam-welded between a pair of electrode wheels, at least the surface corresponding to the inner surface of the fuel tank is Al-plated. A seam welding method for a fuel tank made of a resin-coated Al-based plated steel sheet, comprising a layer and a resin coating layer on at least one of the steel sheet surfaces on which the steel sheets overlap.
避的不純物、またはＳｉを２重量％〜１３重量％含有し
残部Ａｌ及び不可避的不純物からなるめっき層を形成
し、さらにその片面または両面にＣｒ量換算で１０〜２
００ｍｇ／ｍ 2 のクロメートを含む樹脂被覆層を形成し
た樹脂被覆Ａｌ系めっき鋼板を２枚重ねて一対の電極輪
の間でシーム溶接するにあたって、少なくとも燃料タン
クの内面に相当する面がＡｌ系めっき層を有し、かつ電
極輪と接する面のいずれか片方が樹脂被覆層を有するこ
とを特徴とする樹脂被覆Ａｌ系めっき鋼板製燃料タンク
のシーム溶接方法。2. A plating layer containing Al and inevitable impurities or Si in an amount of 2 to 13% by weight and a balance of Al and inevitable impurities is formed on one or both surfaces of the steel sheet, and further on one or both surfaces thereof. 10 to 2 in terms of Cr amount
When two resin-coated Al-based plated steel sheets having a resin coating layer containing 00 mg / m 2 chromate are overlapped and seam-welded between a pair of electrode wheels, at least the surface corresponding to the inner surface of the fuel tank is Al-plated. A seam welding method for a fuel tank made of a resin-coated Al-based plated steel sheet, comprising a layer and a surface in contact with an electrode wheel having a resin coating layer.
避的不純物、またはＳｉを２重量％〜１３重量％含有し
残部Ａｌ及び不可避的不純物からなるめっき層を形成
し、さらにその片面または両面にＣｒ量換算で１０〜２
００ｍｇ／ｍ 2 のクロメートを含む樹脂被覆層を形成し
た樹脂被覆Ａｌ系めっき鋼板を２枚重ねて一対の電極輪
の間でシーム溶接するにあたって、少なくとも燃料タン
クの内面に相当する面がＡｌ系めっき層を有し、かつ電
極輪と接する面の両方が樹脂被覆層を有することを特徴
とする樹脂被覆Ａｌ系めっき鋼板製燃料タンクのシーム
溶接方法。3. A plating layer containing 2% by weight to 13% by weight of Al and inevitable impurities or Si and the balance of Al and inevitable impurities is formed on one or both sides of the steel sheet, and further on one or both sides thereof. 10 to 2 in terms of Cr amount
When two resin-coated Al-based plated steel sheets having a resin coating layer containing 00 mg / m 2 chromate are overlapped and seam-welded between a pair of electrode wheels, at least the surface corresponding to the inner surface of the fuel tank is Al-plated. A seam welding method for a fuel tank made of a resin-coated Al-based plated steel sheet, comprising a resin coating layer on both sides of the fuel tank.
０ｍｇ／ｍ 2 のクロメートを含むことを特徴とする請求
項１〜請求項３に記載の樹脂被覆Ａｌ系めっき鋼板製燃
料タンクのシーム溶接方法。 4. The resin coating layer has a Cr content of 80 to 14
Claims characterized by containing 0 mg / m 2 of chromate
Combustion of resin-coated Al-based steel sheet according to claim 1 to claim 3
Seam welding method for fuel tank.
ることを特徴と する請求項１〜請求項３に記載の樹脂被
覆Ａｌ系めっき鋼板製燃料タンクのシーム溶接方法。 5. The resin coating layer has a thickness of 0.1 to 2 μm.
The resin according to claims 1 to 3, characterized in Rukoto
A seam welding method for a fuel tank made of a coated Al-plated steel sheet.
2 〜５０ｇ／ｍ 2 であることを特徴とする請求項１〜請
求項３に記載の樹脂被覆Ａｌ系めっき鋼板製燃料タンク
のシーム溶接方法。 6. The coating weight of the aluminum-based plating layer is 10 g / m.
Claim 1請which is a 2 to 50 g / m 2
The fuel tank made of the resin-coated Al-based plated steel sheet according to claim 3
Seam welding method.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8129197A JP3333423B2 (en) | 1997-03-31 | 1997-03-31 | Seam welding method for fuel tank made of resin-coated aluminum-based steel sheet |
| CA002261749A CA2261749C (en) | 1996-07-31 | 1997-07-31 | Rustproof steel sheet for automobile fuel tank with excellent resistance weldability corrosion resistance and press moldability |
| US09/230,834 US6361881B1 (en) | 1996-07-31 | 1997-07-31 | Preservative steel plate having high resistance weldability, corrosion resistance and press formability for automobile fuel tanks |
| AU37077/97A AU718855B2 (en) | 1996-07-31 | 1997-07-31 | Rustproof steel sheet for automobile fuel tank with excellent resistance weldability corrosion resistance and press moldability |
| EP97933869A EP0916746A1 (en) | 1996-07-31 | 1997-07-31 | Preservative steel plate having high resistance weldability, corrosion resistance and press formability for automobile fuel tanks |
| PCT/JP1997/002673 WO1998004760A1 (en) | 1996-07-31 | 1997-07-31 | Preservative steel plate having high resistance weldability, corrosion resistance and press formability for automobile fuel tanks |
| KR10-1999-7000833A KR100453387B1 (en) | 1996-07-31 | 1997-07-31 | Preservative steel plate having high resistance weldability, corrosion resistance and press formability for automobile fuel tanks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8129197A JP3333423B2 (en) | 1997-03-31 | 1997-03-31 | Seam welding method for fuel tank made of resin-coated aluminum-based steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10272582A JPH10272582A (en) | 1998-10-13 |
| JP3333423B2 true JP3333423B2 (en) | 2002-10-15 |
Family
ID=13742288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8129197A Expired - Fee Related JP3333423B2 (en) | 1996-07-31 | 1997-03-31 | Seam welding method for fuel tank made of resin-coated aluminum-based steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3333423B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000203588A (en) * | 1998-10-19 | 2000-07-25 | Nisshin Steel Co Ltd | A1-plated steel sheet for fuel tank and production of fuel tank using the same |
-
1997
- 1997-03-31 JP JP8129197A patent/JP3333423B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10272582A (en) | 1998-10-13 |
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