JP2004002931A - Aluminum plated steel sheet having excellent resistance weldability and worked parts obtained by using the same - Google Patents
Aluminum plated steel sheet having excellent resistance weldability and worked parts obtained by using the same Download PDFInfo
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、自動車用部品などに使用されるスポット溶接に代表される抵抗溶接を用いて接合されるアルミニウムめっき鋼板および前記アルミニウムめっき鋼板を用いて加工された部品に関する。
【０００２】
【従来の技術】
従来、薄鋼板を使用した自動車加工部品の多くは、車体組立工程にてスポット溶接に代表される抵抗溶接にて接合され車体を構成する。また、近年、車体防錆性能向上の要求から鋼板表面にめっきなどを施した表面処理鋼板の使用が拡大しているが、一的般に裸鋼板と比較して、表面処理鋼板は溶接性が低下する。低下する溶接性としては▲１▼適正溶接電流範囲が縮小すること、▲２▼電極寿命が低下すること、の２点が挙げられる。前者は、めっき金属の溶融に伴って通電面積が拡大し、充分なナゲットを得るために必要な電流・通電サイクルは裸鋼板よりも大きくなるが、チリ発生電流や溶着電流はナゲット形成電流の上昇ほど大きくならずに、結果として適正溶接電流範囲は縮小するというものである。後者は、電極として用いられる銅合金とめっき金属が溶接中に反応して合金層を形成して、電極表面が合金層に覆われて溶接品質が低下するというものである。
【０００３】
スポット溶接では電極先端径が拡大して電流密度が低下しナゲットが形成しなくなる現象が見られる。また、シーム溶接やプロジェクション溶接では合金層により電極表面の形状や抵抗が不均一となって通電が偏り、チリ発生やナゲット形状が悪化して接合強度が低下したり、穴明きが生じたりするなどの問題が生じる。この特性を改善する方法としては▲１▼皮膜によるバリア効果で合金化反応を抑制すること、▲２▼皮膜や溶接条件にて溶接時の抵抗を低減して、電極表面での合金化反応を抑制することが挙げられる。
【０００４】
めっき鋼板の中でもアルミニウムめっき鋼板は電極の銅合金との反応が顕著であり、溶接時の電極寿命を短かくせしめる鋼板である。このアルミニウムめっき鋼板の電極寿命を向上させる技術としては、特開平１０−１８３３６８号公報、特開平１０−４６３５８号公報、特開平１０−３３０９５７号公報などに開示された技術のように、アルミニウムめっき鋼板の表面に後処理皮膜を付与することで電極寿命を向上させるものがある。ただ、これらの技術でも得られる電極寿命は裸鋼板と比べると小さいものとなっていた。
【０００５】
【発明が解決しようとする課題】
本発明は、前記の溶接性の課題を解決して、抵抗溶接性に優れたアルミニウムめっき鋼板およびこれを用いた加工部品を提供するものである。
【０００６】
【課題を解決するための手段】
本発明者らは、上記課題を解決するために基礎的な検討を実施した。その結果、鋼板表面にＦｅ，Ａｌを主成分とする組成の異なる金属間化合物層を２種類以上層状に存在せしめ、その表面のＦｅ濃度を大きくすると、電極寿命が向上することを知見した。その原因は明確では無いが以下のように推定される。めっき金属と電極である銅合金との合金化は発熱によりめっき金属が拡散することによって抑制されるが、これはアルミニウムめっき層がＦｅ−Ａｌ系の金属間化合物となって融点を上昇させることによりめっき表面の溶融が抑制されて、合金化が著しく抑制されるためと考えられる。
【０００７】
また、その金属間化合物層が２種類以上の組成が異なる金属間化合物層が層状に存在している状態となると、アルミニウムの表面への拡散は、変態を伴うために抑制されて合金化が抑制されるものと推察される。アルミニウムめっき鋼板を加熱してめっき層をＦｅ−Ａｌ合金とするという知見は特開昭６０−２５１２６７号公報、特開２０００−３８６４０号公報、特開平９−１１８９７０号公報に示されているが、表面のＦｅ濃度や金属間化合物の存在状態については言及していない。表面のＦｅ濃度が低く、多種類の金属間化合物の存在状態が層状で無い場合、拡散が抑制されずに溶接性が向上しないものと考えられる。
【０００８】
本発明の要旨とするところは下記のとおりである。
（１）鋼板表面にＦｅ，Ａｌを主成分とする組成の異なる金属間化合物層が２種類以上層状に存在し、金属間化合物層表面から５μｍまでの平均Ｆｅ濃度が質量％で３０％以上であることを特徴とする抵抗溶接性に優れたアルミニウムめっき鋼板。
（２）鋼板表面の金属間化合物層にＳｉを含有することを特徴とする前記（１）に記載の抵抗溶接性に優れたアルミニウムめっき鋼板。
（３）前記（１）、（２）に記載のアルミニウムめっき鋼板を使用することを特徴とする抵抗溶接性に優れたアルミニウムめっき鋼板を用いた加工部品にある。
【０００９】
【発明の実施の形態】
以下に本発明の制限範囲について詳細に説明する。
金属間化合物層の表面から５μｍまでのＦｅの平均濃度を３０％以上としたのは、これ以下のＦｅ濃度であると、めっき層表面の融点が充分上昇せず、抵抗溶接時にめっき層表面が溶融してめっき金属が電極材料である銅合金と合金化しやすくなり、電極寿命が低下するためである。そのＦｅの平均濃度については３０％以上で電極寿命は良好であるが、望ましくは４０％以上である。
【００１０】
金属間化合物層が２種類以上の組成の異なる金属間化合物層が層状にする状態であるとしたのは、１種類では金属間化合物層中のアルミニウムの表面への拡散が抑制されずに電極寿命が向上しないためであり、金属間化合物の存在状態を層状としたのは層状で無い場合、アルミニウムの表面への拡散が抑制されずに電極寿命が向上しないためである。
上記の金属間化合物層を有する鋼板を加工した部品、また鋼板を高温に加熱した状態で成形するホットプレスなどにより上記の金属間化合物層を形成した部品は、抵抗溶接時にめっき層表面の溶融が抑制され、めっき金属と電極の合金化が抑制されて、優れた電極寿命を示す。鋼板の化学成分やミクロ組織は特に制限しないが、上記の金属間化合物層のめっき層を有していれば、優れた電極寿命を示す。
【００１１】
通常、アルミめっき鋼板は溶融めっき法で製造されることが多く、このとき鋼板とめっき層の界面での金属間化合物層（合金層と称する）が成長しやすい。この層が成長しすぎると鋼板の加工性を損なうため、浴中にＳｉを１０％程度添加して製造されている。本発明においては、浴中にＳｉを添加することで、あるいは他の方法でＳｉを金属間化合物中に存在せしめる。
めっき層の構成としては、Ａｌを主成分としているが、前述したようにＳｉの添加も可能である。この他の添加元素としてＣｒ，Ｍｇ，Ｔｉ，Ｓｂ，Ｓｎ，Ｚｎ等が考えられるが、めっき層がＡｌを主体とする限り、適用可能である。しかし、Ｚｎは沸点が低く、大量に添加すると加熱時に表面に粉体状のＺｎを生成して、プレス時のカジリを惹起するため、６０％以上の添加は望ましくない。
【００１２】
本発明において、アルミニウムめっきの付着量、めっき前処理、後処理については特に限定するものではない。めっき付着量は片面３０〜１００ｇ／ｍ２の範囲である。めっき後処理として一次防錆、潤滑性を目的としてクロメート処理、樹脂被覆処理等適用可能であるが、有機樹脂は加熱すると消失してしまうため好ましくない。クロメート処理も近年の６価クロム規制を考慮すると、電解クロメート等の３価の処理皮膜が好ましい。
アルミニウムめっき鋼板の製造法についても何ら限定するものではない。通常の製鋼、熱延条件が適用可能である。アルミニウムめっきは通常溶融めっき法で施されるが、これに限定せず、非水溶媒からの電気めっき、蒸着処理等も使用可能である。めっき前処理としてＮｉプレめっき等のプレめっきもありうるが、これも適用可能である。
【００１３】
また、本発明のめっき層を実現するための手段も特に制限しないが、本発明の範囲を満足していれば優れた電極寿命を示す。考えられる方法としては、鋼板を高温で加熱して本発明を満足する金属間化合物層をめっき層とすることが考えられ、小型電気炉、連続焼鈍ライン、バッチ焼鈍ライン、高周波加熱など方法は問わない。表面の組成は熱処理条件により左右され、金属間化合物層を形成する熱処理条件により制御するべきである。また、金属間化合物層の存在状態を層状にするためにはＦｅのめっき層への均一な拡散が重要である。これらはめっき前の鋼板表面の酸化物や粗度などに影響され、表面の酸化物や粗度などが不均一であると、めっき量が均一であっても本発明の層構造を実現できないことがある。本発明のめっき層を実現させるためには酸洗、めっき前の鋼板表面の洗浄、酸化−還元処理などを充分に行い、めっき前には均一な鋼板表面としておくことが重要である。
【００１４】
また、発明のめっき層を実現するための他の方法として、異なるＦｅとＡｌの比を持つ金属などで金属表面に金属間化合物を多層にコーティングする方法もある。この方法はめっき層の均一性、層構造の均一性に優れるが生産性が低いため、少量の生産に向いている。めっき層中の金属間化合物の存在状態を観察するためにはめっき層断面を研磨後にナイタール（エタノール＋２％硝酸）などで腐食すると、層構造を明確に認識できる。それらの組成を測定するためには走査型電子顕微鏡などにて位置を特定した後、電子線マイクロアナライザー（ＥＰＭＡ）やエネルギー分散型Ｘ線分光計（ＥＤＸ）で組成を分析する。
【００１５】
【実施例】
以下、本発明の実施例について説明する。
通常の熱延、冷延工程を経た、表１に示すような鋼成分の冷延鋼板（板厚１．２ｍｍ）を材料として、溶融アルミニウムめっきを行った。溶融アルミニウムめっきは無酸化炉−還元タイプのラインを使用し、めっき後ガスワイピング法でめっき付着量を両面８０ｇ／ｍ２と１２０ｇ／ｍ２に調節し、その後冷却し、ゼロスパングル処理を施した。この際のめっき浴組成を表２に示す。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不可避のものである。めっき外観は不めっき等なく良好であった。めっき後、インラインにて表３に示す後処理を施し、インラインにて圧下率０．８％のスキンパス圧延を行った。
【００１６】
【表１】
【表２】
【表３】
以上の工程で得られたアルミニウムめっき鋼板を熱処理した。熱処理条件と方法を表４、５、６に示し、いくつかの試料については加熱後、ホットプレスを行った。ホットプレスを行った実験については、表４、５、６に凡例○で示す。また、いくつかの試料については冷却後に加工を行った。冷却後に加工を行った実験については、表４、５、６に凡例○で示す。また、めっき断面を研磨した後、ナイタール腐食し、走査型電子顕微鏡・エネルギー分散型Ｘ線分光計で層構造観察と組成分析を行った。そこで得られた金属間化合物の存在状態と金属間化合物層の表面から５μｍまでの平均Ｆｅ濃度を表４、５、６にあわせて示す。金属間化合物の存在状態は層状であれば○、無ければ×という凡例で示す。
【００２０】
得られた試料について、溶接試験を行い電極寿命を検討した。用いた抵抗溶接はスポット溶接であり、それらの条件を以下に示す。評価はナゲット径が４√ｔを切った時点までの連続打点数とした。ホットプレスを実施した実験についてはホットプレス部品、冷却後に加工した実験については加工部品、その他については鋼板について溶接評価を行った。
【００２１】
（溶接条件）
溶接電源：単相交流
溶接電流：チリ発生電流の９５％
加圧力：３００ｋｇｆ
溶接時間：１２サイクル（周波数：６０Ｈｚ）
電極先端径：６ｍｍφ
電極形状：ドーム型
【００２２】
（評価基準）
◎：連続打点３０００点以上
○：連続打点１５００点以上〜３０００点未満
△：連続打点１０００点以上〜１５００点未満
×：連続打点１０００点未満
【００２３】
【表４】
【表５】
【表６】
評価結果を表４、５、６にあわせて示す。本検討では１５００打点以上を良好とした。Ｎｏ．１、２、５、９、３１、３５、３６、３９、４３、６５、６９、７７、８３、８９はめっき層表面から５μｍまでのＦｅの平均濃度が本発明の範囲外であるため、めっき層表面の溶融が促進されて電極寿命が短くなり、溶接性が低下した。Ｎｏ．４、７、１１、１９、３８、４１、４５、５３はめっき層表面から５μｍまでのＦｅの平均濃度が本発明の範囲内であるが、金属間化合物層の存在状態が層状でなくて本発明の範囲外であるため電極寿命が短くなり、溶接性が低下した。他の実験については、本発明の範囲内の金属間化合物層をめっき層に持つアルミニウムめっき鋼板、もしくはアルミニウムめっき鋼板を使用した部品であるため、電極寿命が長く、良好な溶接性を示した。
【００２７】
【発明の効果】
本発明は、抵抗溶接を用いて接合されるアルミニウムめっき鋼板とアルミニウムめっき鋼板を用いて加工された部品について、良好な溶接性をもたらすものであり、産業上の寄与は大きい。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an aluminum-plated steel sheet joined by using resistance welding typified by spot welding used for automobile parts and the like, and a part processed using the aluminum-plated steel sheet.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, many automotive processed parts using thin steel plates are joined by resistance welding typified by spot welding in a vehicle body assembling process to form a vehicle body. Also, in recent years, the use of surface-treated steel sheets with plating applied to the surface of steel sheets has been expanding due to the demand for improved body rust prevention performance, but surface-treated steel sheets generally have lower weldability than bare steel sheets. descend. As the weldability to be reduced, there are two points: (1) reduction of the appropriate welding current range, and (2) reduction of the electrode life. In the former case, the current-carrying area increases as the plating metal melts, and the current and current-carrying cycle required to obtain a sufficient nugget become larger than that of a bare steel sheet, but the dust generation current and welding current increase in the nugget formation current. Instead, the proper welding current range is reduced as a result. In the latter, a copper alloy and a plating metal used as an electrode react during welding to form an alloy layer, and the electrode surface is covered with the alloy layer to deteriorate welding quality.
[0003]
In spot welding, a phenomenon is observed in which the electrode tip diameter increases, the current density decreases, and no nugget is formed. Also, in seam welding and projection welding, the shape and resistance of the electrode surface become non-uniform due to the alloy layer, and the energization is biased, and the generation of dust and the shape of the nugget deteriorate, resulting in a decrease in bonding strength and perforation. And other problems. To improve this property, (1) suppress the alloying reaction by the barrier effect of the film, and (2) reduce the alloying reaction on the electrode surface by reducing the resistance during welding under the film and welding conditions. Suppression.
[0004]
Among the plated steel sheets, the aluminum-plated steel sheet has a remarkable reaction with the copper alloy of the electrode, and is a steel sheet that shortens the electrode life during welding. As a technique for improving the electrode life of the aluminum-plated steel sheet, as disclosed in JP-A-10-183368, JP-A-10-46358, and JP-A-10-330957, In some cases, a post-treatment film is applied to the surface of the electrode to improve the life of the electrode. However, the electrode life obtained with these techniques was shorter than that of bare steel plates.
[0005]
[Problems to be solved by the invention]
The present invention solves the above-described problem of weldability, and provides an aluminum-plated steel sheet having excellent resistance weldability and a machined part using the same.
[0006]
[Means for Solving the Problems]
The present inventors have conducted basic studies to solve the above-mentioned problems. As a result, it was found that when two or more kinds of intermetallic compound layers having different compositions mainly composed of Fe and Al were present on the surface of the steel sheet and the Fe concentration on the surface was increased, the electrode life was improved. Although the cause is not clear, it is estimated as follows. The alloying between the plating metal and the copper alloy as an electrode is suppressed by the diffusion of the plating metal due to heat generation. This is because the aluminum plating layer becomes an Fe-Al intermetallic compound and raises the melting point. It is considered that melting of the plating surface is suppressed and alloying is significantly suppressed.
[0007]
Further, when the intermetallic compound layer is in a state where two or more kinds of intermetallic compound layers having different compositions are present in a layered state, the diffusion of aluminum to the surface is suppressed due to transformation, thereby suppressing alloying. It is presumed that it will be done. The knowledge of heating an aluminum-plated steel sheet to form a plating layer into an Fe-Al alloy is disclosed in JP-A-60-251267, JP-A-2000-38640, and JP-A-9-118970, No mention is made of the Fe concentration on the surface or the presence of intermetallic compounds. When the Fe concentration on the surface is low and the existence state of the various kinds of intermetallic compounds is not laminar, it is considered that diffusion is not suppressed and weldability is not improved.
[0008]
The gist of the present invention is as follows.
(1) Two or more kinds of intermetallic compound layers having different compositions mainly composed of Fe and Al exist on the surface of the steel sheet in a layered manner, and the average Fe concentration from the surface of the intermetallic compound layer to 5 μm is 30% or more by mass%. An aluminum-plated steel sheet with excellent resistance weldability.
(2) The aluminum-plated steel sheet excellent in resistance weldability according to (1), wherein the intermetallic compound layer on the surface of the steel sheet contains Si.
(3) A machined part using an aluminum-plated steel sheet excellent in resistance weldability, characterized by using the aluminum-plated steel sheet according to (1) or (2).
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the limitation range of the present invention will be described in detail.
The reason why the average concentration of Fe up to 5 μm from the surface of the intermetallic compound layer is set to 30% or more is that if the Fe concentration is less than this, the melting point of the plating layer surface does not sufficiently increase, and the plating layer surface during resistance welding does not increase. This is because the plating metal is likely to be alloyed with the copper alloy as the electrode material by melting, and the life of the electrode is shortened. The electrode life is good when the average concentration of Fe is 30% or more, but preferably 40% or more.
[0010]
The reason that the intermetallic compound layer is in a state where two or more kinds of intermetallic compound layers having different compositions are in a layered state is that the diffusion of aluminum in the intermetallic compound layer to the surface is not suppressed and the electrode life is increased. The reason why the intermetallic compound is present in the form of a layer is that when the layer is not a layer, diffusion of aluminum to the surface is not suppressed and the life of the electrode is not improved.
Parts processed from a steel sheet having the above-mentioned intermetallic compound layer, and parts formed from the above-mentioned intermetallic compound layer by hot pressing or the like in a state where the steel sheet is heated to a high temperature, have a molten plating surface during resistance welding. Suppressed, alloying of the plating metal and the electrode is suppressed, and excellent electrode life is exhibited. The chemical composition and microstructure of the steel sheet are not particularly limited. However, if the steel sheet has the above-mentioned plating layer of the intermetallic compound layer, an excellent electrode life is exhibited.
[0011]
Usually, an aluminum-plated steel sheet is often manufactured by a hot-dip plating method, and at this time, an intermetallic compound layer (referred to as an alloy layer) at an interface between the steel sheet and the plating layer tends to grow. If this layer grows too much, the workability of the steel sheet is impaired, so that it is manufactured by adding about 10% of Si to the bath. In the present invention, Si is added to the intermetallic compound by adding Si to the bath or by another method.
The configuration of the plating layer is mainly composed of Al, but Si can be added as described above. Other additional elements include Cr, Mg, Ti, Sb, Sn, Zn, and the like, but are applicable as long as the plating layer is mainly composed of Al. However, Zn has a low boiling point, and when added in a large amount, powdered Zn is generated on the surface during heating to cause galling at the time of pressing. Therefore, addition of 60% or more is not desirable.
[0012]
In the present invention, the adhesion amount of aluminum plating, pre-plating treatment, and post-treatment are not particularly limited. The plating adhesion amount is in a range of 30 to 100 g / m 2 on one side. As a post-plating treatment, chromate treatment, resin coating treatment, etc. can be applied for the purpose of primary rust prevention and lubricity, but the organic resin is undesirably lost when heated. In consideration of recent hexavalent chromium regulations, a chromate treatment is preferably a trivalent treatment film such as electrolytic chromate.
The method for producing the aluminum-plated steel sheet is not limited at all. Normal steelmaking and hot rolling conditions can be applied. The aluminum plating is usually performed by a hot-dip plating method, but is not limited thereto, and electroplating from a non-aqueous solvent, vapor deposition, or the like can also be used. Pre-plating such as Ni pre-plating may be used as a pre-plating process, but this is also applicable.
[0013]
The means for realizing the plating layer of the present invention is not particularly limited, but if the range of the present invention is satisfied, an excellent electrode life is exhibited. As a conceivable method, it is conceivable that a steel sheet is heated at a high temperature and an intermetallic compound layer satisfying the present invention is used as a plating layer. Absent. The composition of the surface depends on the heat treatment conditions and should be controlled by the heat treatment conditions for forming the intermetallic compound layer. Further, in order to make the existing state of the intermetallic compound layer laminar, it is important to uniformly diffuse Fe into the plating layer. These are affected by the oxide and roughness of the steel sheet surface before plating. If the surface oxide and roughness are not uniform, the layer structure of the present invention cannot be realized even if the plating amount is uniform. There is. In order to realize the plating layer of the present invention, it is important to sufficiently perform pickling, cleaning of the surface of the steel sheet before plating, oxidation-reduction treatment, etc., so that the surface of the steel sheet is uniform before plating.
[0014]
Further, as another method for realizing the plating layer of the present invention, there is a method in which a metal surface is coated with an intermetallic compound in multiple layers with metals having different ratios of Fe and Al. This method is excellent in the uniformity of the plating layer and the uniformity of the layer structure, but is suitable for small-quantity production because of low productivity. In order to observe the state of the intermetallic compound in the plating layer, the layer structure can be clearly recognized by polishing the cross section of the plating layer with nital (ethanol + 2% nitric acid) or the like after polishing. In order to measure the composition, the position is specified by a scanning electron microscope or the like, and then the composition is analyzed by an electron beam microanalyzer (EPMA) or an energy dispersive X-ray spectrometer (EDX).
[0015]
【Example】
Hereinafter, examples of the present invention will be described.
Hot-rolled aluminum plating was performed using a cold-rolled steel plate (sheet thickness: 1.2 mm) having a steel composition as shown in Table 1 after normal hot rolling and cold rolling processes. Molten aluminum plating a non-oxidizing furnace - using reductive types of lines, the coating weight in plating after gas wiping method was adjusted on both sides 80 g / m 2 and 120 g / m 2, then cooled and subjected to a zero spangle treatment . Table 2 shows the plating bath composition at this time. The Fe in the bath is inevitable supplied from plating equipment and strips in the bath. The plating appearance was good without any non-plating. After plating, post-treatments shown in Table 3 were performed in-line, and skin-pass rolling was performed in-line at a rolling reduction of 0.8%.
[0016]
[Table 1]
[Table 2]
[Table 3]
The aluminum-plated steel sheet obtained in the above steps was heat-treated. The heat treatment conditions and methods are shown in Tables 4, 5, and 6. Some samples were heated and then hot pressed. Tables 4, 5, and 6 show the results of the hot-pressing experiments with the legend ○. Some of the samples were processed after cooling. The experiments performed after cooling are shown in Tables 4, 5 and 6 by the legend ○. After polishing the cross section of the plating, it was corroded by nital, and the layer structure was observed and the composition was analyzed using a scanning electron microscope and an energy dispersive X-ray spectrometer. Tables 4, 5 and 6 show the presence state of the intermetallic compound and the average Fe concentration from the surface of the intermetallic compound layer up to 5 μm. The presence state of the intermetallic compound is indicated by a legend “O” if it is layered, and “X” if it is not.
[0020]
A welding test was performed on the obtained sample to examine the electrode life. The resistance welding used was spot welding, and their conditions are shown below. The evaluation was made as the number of continuous hits until the nugget diameter fell below 4 at. Welding evaluation was performed on the hot-pressed part for the experiment in which hot pressing was performed, the processed part for the experiment performed after cooling, and the steel plate for the other parts.
[0021]
(Welding conditions)
Welding power source: Single-phase AC welding current: 95% of current generated by dust
Pressure: 300kgf
Welding time: 12 cycles (frequency: 60 Hz)
Electrode tip diameter: 6mmφ
Electrode shape: dome type
(Evaluation criteria)
：: 3000 continuous points or more 以上: 1500 points or more to less than 3000 points △: 1000 points or more to less than 1500 points ×: 1000 points or less of continuous points
[Table 4]
[Table 5]
[Table 6]
The evaluation results are shown in Tables 4, 5, and 6. In this study, 1500 points or more were determined to be good. No. 1, 2, 5, 9, 31, 35, 36, 39, 43, 65, 69, 77, 83, and 89 were plated because the average concentration of Fe up to 5 μm from the plating layer surface was outside the range of the present invention. Melting of the layer surface was promoted, the electrode life was shortened, and the weldability was reduced. No. Nos. 4, 7, 11, 19, 38, 41, 45 and 53 have an average concentration of Fe up to 5 μm from the plating layer surface within the range of the present invention. Since it is outside the range of the invention, the electrode life was shortened and the weldability was reduced. In other experiments, since the aluminum-plated steel sheet having the intermetallic compound layer in the plating layer within the scope of the present invention or a component using the aluminum-plated steel sheet, the electrode life was long and good weldability was exhibited.
[0027]
【The invention's effect】
INDUSTRIAL APPLICABILITY The present invention provides good weldability for an aluminum-plated steel sheet joined using resistance welding and a part processed using the aluminum-plated steel sheet, and has a great industrial contribution.
Claims (3)
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| JP2002160166A JP2004002931A (en) | 2002-05-31 | 2002-05-31 | Aluminum plated steel sheet having excellent resistance weldability and worked parts obtained by using the same |
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