JP4326492B2 - Dissimilar materials joining method using laser welding - Google Patents

Dissimilar materials joining method using laser welding Download PDF

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JP4326492B2
JP4326492B2 JP2005105156A JP2005105156A JP4326492B2 JP 4326492 B2 JP4326492 B2 JP 4326492B2 JP 2005105156 A JP2005105156 A JP 2005105156A JP 2005105156 A JP2005105156 A JP 2005105156A JP 4326492 B2 JP4326492 B2 JP 4326492B2
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heat source
aluminum
zinc
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JP2006281279A (en
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松本  剛
誠二 笹部
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Kobe Steel Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/346Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
    • B23K26/348Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma welding

Description

本発明は、自動車の各種構造材等として使用されるアルミニウム系材料と鉄系材料との複合構造体を得るための異材接合方法において、特に、ろう材及びフラックスを使用しない異材接合方法に関する。   The present invention relates to a dissimilar material joining method for obtaining a composite structure of an aluminum-based material and an iron-based material used as various structural materials for automobiles, and more particularly to a dissimilar material joining method that does not use brazing material and flux.

自動車の各種構造材は、その軽量化のために、一部アルミニウム系材料が使用されており、このため、鉄系材料とアルミニウム系材料との異材同士を接合する方法の開発が要望されている。従来の異材接合方法としては、アルミニウム系のろう材を使用するろう付けが一般的である(特許文献1及び2、非特許文献1)。同種材料同士を接合する方法として一般的に使用されているレーザ溶接等の溶融溶接方法を、アルミニウム系被溶接材と鉄系被溶接材との異材接合に適用すると、アルミニウム系材料と鉄系材料との界面に、AlFe等の脆いAl−Fe系金属間化合物が生成し、これがアルミニウム系被溶接材と鉄系被溶接材との間の接合強度を著しく低下させるからである。 Various structural materials for automobiles use some aluminum-based materials to reduce their weight. For this reason, development of a method for joining different materials of iron-based materials and aluminum-based materials is desired. . As a conventional dissimilar material joining method, brazing using an aluminum brazing material is common (Patent Documents 1 and 2, Non-Patent Document 1). When a fusion welding method such as laser welding, which is generally used as a method for joining the same kind of materials, is applied to dissimilar joining of an aluminum-based welded material and an iron-based welded material, an aluminum-based material and an iron-based material This is because a brittle Al—Fe-based intermetallic compound such as Al 3 Fe is formed at the interface between the aluminum-based weld and the joint strength between the aluminum-based welded material and the iron-based welded material.

また、ろう付けではなく、スポット溶接によりアルミニウム系材料と鉄系材料とを接合する方法もある。更に、異種金属のレーザロール方法も提案されている(特許文献3)。この方法は、第1金属板のみをレーザ照射によって加熱した後、その第1金属板の加熱部を圧接ローラによって第2金属板に押圧して密着させ、塑性変形を与えることによって両金属板を接合するものである。   There is also a method of joining an aluminum material and an iron material by spot welding instead of brazing. Furthermore, a laser roll method of dissimilar metals has also been proposed (Patent Document 3). In this method, after heating only the first metal plate by laser irradiation, the heated portion of the first metal plate is pressed against the second metal plate by a pressure roller, and both metal plates are subjected to plastic deformation. It is what is joined.

特開平7−148571号公報JP 7-148571 A 特開平10−314933号公報JP 10-314933 A 特許第3535152号公報Japanese Patent No. 3535152 溶接学会論文集第22巻第2号p315−322(2004)Journal of the Japan Welding Society Vol.22, No.2, p315-322 (2004)

しかしながら、上記従来の異材接合方法は、以下に示す欠点を有する。先ず、ろう付けによる異材接合方法は、アルミニウム系被溶接材と鉄系被溶接材との間に、ろう材を挿入する必要があるため、接合コストが高くなるという問題点がある。   However, the conventional dissimilar material joining method has the following drawbacks. First, the dissimilar material joining method by brazing has a problem that the joining cost increases because it is necessary to insert a brazing material between the aluminum-based welded material and the iron-based welded material.

また、スポット溶接の場合は、線接合ではなく、点接合であるため、接合点間の部分で、液体又は気体が通過するため、被接合材間を、気密的又は液密的に封止することができない。また、スポット溶接は、片面からのみ接合作業するということができず、重ね部の両面に電極を配置する必要があるため、接合作業に制約がある。   Moreover, in the case of spot welding, since it is not line bonding but point bonding, liquid or gas passes between the bonding points, so that the materials to be bonded are sealed airtight or liquidtight. I can't. In addition, spot welding cannot be performed from one side only, and it is necessary to dispose electrodes on both sides of the overlapping portion, so that there is a limitation in the joining operation.

更に、ロール接合においては、異材同士をロールにより加圧する必要があり、大がかりな装置が必要であるという難点がある。   Furthermore, in roll joining, it is necessary to press different materials with a roll, and there exists a difficulty that a large-scale apparatus is required.

ところで、公知技術ではないが、被覆層を有する鉄系被溶接材を用いて、その被覆層を溶融させて接合する方法が考えられる。しかしながら、主に自動車用として一般に使われる亜鉛系被覆鉄系被溶接材では、その亜鉛系被覆層が合金化して融点が高い組織となっており、そのため被覆層の溶融に多くの熱量を必要とする。このため、アルミニウム系被溶接材だけでなく鉄系被溶接材も溶融して脆い金属間化合物が生成する虞があるため、接合部強度が低下しないように接合することは困難である。   By the way, although it is not a well-known technique, the method of melt | dissolving and joining the coating layer using the iron-type to-be-welded material which has a coating layer can be considered. However, in the zinc-based coated iron-based welded materials generally used mainly for automobiles, the zinc-based coating layer is alloyed and has a high melting point structure, so that a large amount of heat is required for melting the coating layer. To do. For this reason, since not only an aluminum-type to-be-welded material but an iron-type to-be-welded material may be melted and a brittle intermetallic compound may be generated, it is difficult to join so that the joint strength does not decrease.

本発明はかかる問題点に鑑みてなされたものであって、アルミニウム系被溶接材と鉄系被溶接材とを、ろう材及びフラックスを使用せずに、複合溶接することができ、容易かつ高強度に異材同士を接合することができる異材方法を提供することを目的とする。   The present invention has been made in view of such a problem, and can be combined and welded with an aluminum-based welded material and an iron-based welded material without using a brazing material and a flux. It aims at providing the different material method which can join different materials in intensity | strength.

本発明に係る異材接合方法は、アルミニウム又はアルミニウム合金からなるアルミニウム系被溶接材と、表面に亜鉛又は亜鉛合金からなる亜鉛系被覆層を有する鉄系被溶接材とを、前記アルミニウム系被溶接材の端部を前記鉄系被溶接材上に重ねて重ね継手を形成し、この重ね部を接合する異材接合方法において、レーザ光を前記重ね部の端部近傍の前記鉄系被溶接材の表面にアルミニウム系被溶接材側から照射して加熱する第1熱源と、前記重ね部の前記アルミニウム系被溶接材の表面を加熱する第2熱源とを、前記重ね部の端部に沿って前記第1熱源を前記第2熱源に先行させて移動させることにより、先行の第1熱源により前記重ね部の端部近傍の前記亜鉛系被覆層のみを溶融させた後、後行の第2熱源により前記重なり部の前記亜鉛系被覆層及び前記アルミニウム系被溶接材を溶融させることを特徴とする。   The dissimilar material joining method according to the present invention includes an aluminum-based welded material made of aluminum or an aluminum alloy and an iron-based welded material having a zinc-based coating layer made of zinc or a zinc alloy on the surface. In the dissimilar material joining method in which the end portion of the overlapped portion is formed by overlapping the end portion of the overlapped portion on the surface of the iron-based welded material, the surface of the iron-based welded material in the vicinity of the end of the overlapped portion is irradiated with laser light. A first heat source that irradiates and heats from the side of the aluminum-based workpiece and a second heat source that heats the surface of the aluminum-based workpiece of the overlap portion along the end of the overlap portion. By moving one heat source ahead of the second heat source, only the zinc-based coating layer in the vicinity of the end of the overlapped portion is melted by the preceding first heat source, and then the second heat source following the second heat source Overlap zinc The covering layer and the aluminum-based workpieces, characterized in that to melt.

この異材接合方法において、例えば、前記第1熱源は、CO、YAG、又は半導体のレーザ光熱源であり、前記第2熱源は、レーザ光、MIG溶接、TIG溶接、又はプラズマ溶接の熱源である。 In this dissimilar material joining method, for example, the first heat source is a CO 2 , YAG, or semiconductor laser light heat source, and the second heat source is a laser light, MIG welding, TIG welding, or plasma welding heat source. .

本発明によれば、ろう材を使用せずにアルミニウム系被溶接材と鉄系被溶接材とをレーザ溶接することができるので、容易で且つ高強度に異材同士を接合することができる。そして、本発明は、点接合ではなく、線接合であるので、異材同士を接合部が封密的になるように接合することができる。   According to the present invention, since the aluminum-based workpiece and the iron-based workpiece can be laser-welded without using the brazing material, different materials can be joined easily and with high strength. And since this invention is not a point joining but a line joining, it can join dissimilar materials so that a junction part may become sealed.

以下、本発明の実施の形態について添付の図面を参照して具体的に説明する。図1は、本発明の実施形態に係る異材接合方法を示す斜視図、図2はその接合部の断面図で、先行レーザ溶接後の状況、図3は同じくその接合部の断面図で、後行熱源による溶接後の状況である。鉄系被溶接材としての鋼板1と、アルミニウム系(アルミニウム又はアルミニウム合金)被溶接材としてのアルミニウム系板2とをその端部で重ね合わせ、重ね部3を、その端部に沿って溶接する。   Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a perspective view showing a dissimilar material joining method according to an embodiment of the present invention, FIG. 2 is a sectional view of the joining portion, a state after preceding laser welding, and FIG. 3 is a sectional view of the joining portion, This is the situation after welding with a row heat source. A steel plate 1 as an iron-based workpiece and an aluminum-based plate 2 as an aluminum-based (aluminum or aluminum alloy) workpiece are overlapped at the end, and the overlap portion 3 is welded along the end. .

鋼板1には、その表面に亜鉛系被覆層4が被覆されている。この被覆層4は、溶融めっき又は溶射等の手段により形成することができる。この被覆層4は、純亜鉛又はアルミニウム、マグネシウム又は鉄等を含む亜鉛合金である。鋼板1としては、軟鋼、高張力鋼、ステンレス鋼等種々の鋼材を適用することができ、また、鉄系被溶接材としては、その形状は板材に限らず、形鋼等にも適用できる。   A surface of the steel plate 1 is covered with a zinc-based coating layer 4. This coating layer 4 can be formed by means such as hot dipping or thermal spraying. The covering layer 4 is pure zinc or a zinc alloy containing aluminum, magnesium, iron or the like. As the steel plate 1, various steel materials such as mild steel, high-tensile steel, and stainless steel can be applied. Further, as the iron-based welded material, the shape is not limited to the plate material, and can be applied to a shape steel or the like.

アルミニウム系板2としては、純アルミニウム及び種々のアルミニウム合金を適用することができる。また、アルミニウム系板2の形状としては、全体が板材である場合に限らず、重ね部3において、板状になっていればよく、種々の形状の形材等にも適用することができる。   As the aluminum-based plate 2, pure aluminum and various aluminum alloys can be applied. In addition, the shape of the aluminum-based plate 2 is not limited to the case where the whole is a plate material, but may be a plate shape in the overlapping portion 3 and can be applied to various shapes and the like.

第1熱源10及び第2熱源11は、夫々先行熱源及び後行熱源であり、いずれも重ね部3の端部に沿って移動し、重ね部3を溶接する。第1熱源10は重ね部3の近傍の鋼板1の表面を加熱するものであり、例えば、CO、YAG、半導体等のレーザ光熱源である。一方、第2熱源11は重ね部3におけるアルミニウム系板2の表面を加熱するものであり、例えば、レーザ光、MIG溶接、TIG溶接、プラズマ溶接等の熱源である。第1熱源10のエネルギー密度は、第2熱源11のエネルギー密度よりも高くする。そして、これらのレーザ光10,11は、先ず、レーザ光10が先行して重ね部3の端部に沿って移動し、その後、レーザ光11がレーザ光10から若干遅れてレーザ光10と同一方向に重ね部3の端部に沿って移動する。よって、このレーザ光10,11の移動方向に垂直の方向については、先ず、重ね部3の端部近傍の鋼板1の表面が加熱され、その後、重ね部3のアルミニウム系板2の表面が加熱される。 The first heat source 10 and the second heat source 11 are a leading heat source and a trailing heat source, respectively, and both move along the end of the overlapping portion 3 and weld the overlapping portion 3. The first heat source 10 heats the surface of the steel plate 1 in the vicinity of the overlapped portion 3, and is, for example, a laser light heat source such as CO 2 , YAG, or semiconductor. On the other hand, the 2nd heat source 11 heats the surface of the aluminum-type board 2 in the overlap part 3, for example, heat sources, such as a laser beam, MIG welding, TIG welding, and plasma welding. The energy density of the first heat source 10 is set higher than the energy density of the second heat source 11. The laser beams 10 and 11 are first moved along the end portion of the overlapping portion 3 with the laser beam 10 first, and then the laser beam 11 is the same as the laser beam 10 with a slight delay from the laser beam 10. Move along the end of the overlap 3 in the direction. Therefore, in the direction perpendicular to the moving direction of the laser beams 10 and 11, first, the surface of the steel plate 1 in the vicinity of the end of the overlapping portion 3 is heated, and then the surface of the aluminum-based plate 2 of the overlapping portion 3 is heated. Is done.

次に、本実施形態の異材接合方法の動作について説明する。先ず、アルミニウム系板2をレーザ光の照射源側に配置して、その端部を鋼板1の端部上に重ね、重ね部3に重ね隅肉継手を構成する。そして、図2に示すように、先ず、先行して重ね部3近傍の鋼板1の表面にCO、YAG、半導体等のレーザ光を照射して重ね部3近傍の鋼板1の表面を第1熱源10により加熱すると、レーザ光による熱集中型の加熱によって、被覆層4のみが溶融して溶融部12が形成される。 Next, the operation of the dissimilar material joining method of this embodiment will be described. First, the aluminum-based plate 2 is arranged on the laser beam irradiation source side, and its end portion is overlapped on the end portion of the steel plate 1, and a lap fillet joint is formed on the overlap portion 3. As shown in FIG. 2, first, the surface of the steel sheet 1 near the overlapped portion 3 is irradiated with laser light such as CO 2 , YAG, or semiconductor in advance to make the surface of the steel plate 1 near the overlapped portion 3 first. When heated by the heat source 10, only the coating layer 4 is melted and the melted part 12 is formed by the heat-concentrated heating by the laser beam.

その直後、図3に示すように、後行のレーザ光、MIG溶接、TIG溶接、プラズマ溶接等の第2熱源11を主にアルミニウム系板2に付与する。これにより、アルミニウム系板2が部分的に溶融し、溶融部13が形成され、先行レーザ加熱により鋼板1の表面に形成された亜鉛系被覆層4の溶融部12との相乗効果により、亜鉛系被覆層4が広い範囲で溶融し、結果として安定した品質の異材接合継手を容易に得ることができる。この鋼板1はその表面に亜鉛系被覆層4が形成されているので、先行レーザ光照射による第1熱源10と後行第2熱源11との相乗効果により、アルミニウム系板2と共に亜鉛系被覆層4も溶融するため、両被溶接材は、極めて親和性が高く、安定した溶接接合継手が得られる。   Immediately thereafter, as shown in FIG. 3, a second heat source 11 such as subsequent laser light, MIG welding, TIG welding, plasma welding or the like is mainly applied to the aluminum-based plate 2. Thereby, the aluminum-based plate 2 is partially melted to form the melted portion 13, and due to the synergistic effect with the melted portion 12 of the zinc-based coating layer 4 formed on the surface of the steel plate 1 by the preceding laser heating, The covering layer 4 melts in a wide range, and as a result, a dissimilar joint joint with stable quality can be easily obtained. Since the zinc-based coating layer 4 is formed on the surface of the steel plate 1, the zinc-based coating layer is formed together with the aluminum-based plate 2 by the synergistic effect of the first heat source 10 and the succeeding second heat source 11 by the preceding laser light irradiation. Since 4 also melts, both welded materials have extremely high affinity, and a stable welded joint can be obtained.

次に、本実施形態の効果について説明する。本実施形態においては、第1熱源10として、CO、YAG、半導体等のレーザ光熱源を使用している。レーザ光熱源を使用すれば、溶込深さ等の溶融部の精密なコントロールが可能となる。特に、レーザ出力を抑えつつ、レーザ光のエネルギー密度を高くすることにより、前述のコントロールが容易になる。例えば、レーザ出力を1.2kWと低くしても、レーザビームを集光してスポット径を小さく絞ることにより、エネルギー密度を高めることができる。これにより、第1熱源10により、鋼板1上の亜鉛系被覆層4のみを溶融させることが可能となる。これに対して、第1熱源としてアーク等のレーザ光熱源以外の熱源を使用すると、溶融部を精密にコントロールすることが極めて困難である。 Next, the effect of this embodiment will be described. In the present embodiment, a laser light heat source such as CO 2 , YAG, or semiconductor is used as the first heat source 10. If a laser light source is used, precise control of the melted part such as the penetration depth becomes possible. In particular, the aforementioned control is facilitated by increasing the energy density of the laser beam while suppressing the laser output. For example, even if the laser output is lowered to 1.2 kW, the energy density can be increased by condensing the laser beam and reducing the spot diameter. As a result, only the zinc-based coating layer 4 on the steel plate 1 can be melted by the first heat source 10. On the other hand, when a heat source other than a laser light heat source such as an arc is used as the first heat source, it is extremely difficult to precisely control the melting portion.

そして、第2熱源11として、例えば、第1熱源10よりもエネルギー密度が小さい熱源を使用することにより、溶接部の温度の上昇を抑制しながら溶接を行う。これにより、アルミニウム系板2を溶融させつつも、金属間化合物の生成を抑制することができる。このように、本実施形態においては、第1熱源10と第2熱源11とに相互に異なる役割を持たせることにより、鋼板1とアルミニウム系板2とを良好に溶接することができる。   For example, by using a heat source having an energy density smaller than that of the first heat source 10 as the second heat source 11, welding is performed while suppressing an increase in the temperature of the welded portion. Thereby, the production | generation of an intermetallic compound can be suppressed, melting the aluminum-type board 2. FIG. Thus, in this embodiment, the steel plate 1 and the aluminum plate 2 can be favorably welded by giving the first heat source 10 and the second heat source 11 different roles.

なお、鋼板1の下面側から同様に第2熱源11を付加しても、亜鉛系被覆層4(めっき層)は溶融するものの、アルミニウム系板2は先行レーザ光照射部以外の領域の温度が低いため、一部しか溶融しない。このため、両者を強固に接合することができない。   In addition, even if the 2nd heat source 11 is similarly added from the lower surface side of the steel plate 1, although the zinc-type coating layer 4 (plating layer) melts, the aluminum-type plate 2 has the temperature of areas other than the preceding laser light irradiation part. Because it is low, only part of it melts. For this reason, both cannot be joined firmly.

本発明においては、重ね部3の重ね代及び後行熱源11の狙い位置は特に制約を受けるものではない。先行レーザ光と後行熱源の距離も、板厚、接合速度及び材料に応じて適切な間隔とすればよい。また、溶加材についても、アルミニウム系溶加材であれば、その添加の有無、溶加材の種類、及び径等は、特に制約がない。しかし、先行のレーザ溶接時には溶加材は添加しない方が望ましい。   In the present invention, the overlap margin of the overlapping portion 3 and the target position of the subsequent heat source 11 are not particularly limited. The distance between the preceding laser beam and the subsequent heat source may be set to an appropriate interval according to the plate thickness, the joining speed, and the material. In addition, regarding the filler material, if it is an aluminum-based filler material, the presence or absence of the addition, the type of filler material, the diameter, and the like are not particularly limited. However, it is desirable not to add a filler material during the preceding laser welding.

以下、本発明の実施例について説明する。図1に示す重ね隅肉継手を構成した。供試材は、アルミニウム系板2がJISA5182P−O材であり、その板厚は1mmである。鋼板1は亜鉛めっき鋼板であり、板厚は1mmである。亜鉛めっき層4のめっき量は、50g/cmであった。一方、比較例としては、めっきを施さない鋼板(板厚1mm)を使用した。 Examples of the present invention will be described below. The lap fillet joint shown in FIG. 1 was constructed. In the test material, the aluminum-based plate 2 is a JIS A5182P-O material, and the plate thickness is 1 mm. The steel plate 1 is a galvanized steel plate and the plate thickness is 1 mm. The plating amount of the galvanized layer 4 was 50 g / cm 2 . On the other hand, as a comparative example, a steel plate (plate thickness 1 mm) not subjected to plating was used.

図1に示すように、アルミニウム系板2と鋼板1の両端部を6mmの重ね代で重ね合わせ、先行して鉄系板1にYAGレーザ光を照射して、鉄系板1の表面層のみを溶融加熱し、後行熱源11として、アルミニウム系板2側から、MIG溶接を使用して加熱し、複合溶接を行った。溶接条件は、先行のレーザ出力が1.2kW、後行のMIG溶接が、電流80A、溶加材がJIS A4043WY ワイヤ径が1.2mm、溶接速度が1.5m/分とした。一方、比較例として、先行レーザ光をアルミニウム系板2側に照射した場合と、MIG溶接のみを行った場合とで重ね隅肉溶接した。   As shown in FIG. 1, both ends of the aluminum plate 2 and the steel plate 1 are overlapped with a 6 mm overlap, and the iron plate 1 is irradiated with YAG laser light in advance, and only the surface layer of the iron plate 1 is irradiated. Was melt-heated and heated as a trailing heat source 11 from the aluminum-based plate 2 side using MIG welding to perform composite welding. As for welding conditions, the preceding laser output was 1.2 kW, the subsequent MIG welding was an electric current of 80 A, the filler metal was JIS A4043 WY, the wire diameter was 1.2 mm, and the welding speed was 1.5 m / min. On the other hand, as a comparative example, overlapped fillet welding was performed when the preceding laser beam was applied to the aluminum-based plate 2 side and when only MIG welding was performed.

このようにして溶接した重ね隅肉継手について、JIS Z2201 5号試験片に加工した後、引張試験を行った。接合長単位長さあたりの引張破断強度及び破断位置を下記表1に示す。なお、表1の評価欄は引張強度を分類したものであり、○は「良好に接合」、△は「接合するが接合強度が弱い」、×は「全く接合せず」を示す。   The lap fillet joint thus welded was processed into a JIS Z2201 No. 5 test piece and then subjected to a tensile test. Table 1 below shows the tensile strength at break and the break position per unit length of the joining length. The evaluation column in Table 1 classifies the tensile strength, where ◯ indicates “good bonding”, Δ indicates “bonded but weak bonding strength”, and x indicates “not bonded at all”.

この表1に示すように、複合溶接でもレーザ光の照射位置が異なる場合(比較例2)及びレーザ光の照射がない場合(比較例3)は、亜鉛系被覆層が十分に溶融せず、アルミニウム系材との溶融接合部が少なかったために、界面で剥がれやすくなった。また、亜鉛系被覆層(めっき層)4を有しない比較例4の場合は、鋼板とアルミニウム系板とが直接接触しているので、レーザ光を照射しても、重ね部で溶融接合が生じることはない。   As shown in Table 1, when the laser beam irradiation position is different even in composite welding (Comparative Example 2) and when there is no laser light irradiation (Comparative Example 3), the zinc-based coating layer is not sufficiently melted, Since there were few fusion-bonding parts with an aluminum-type material, it became easy to peel at the interface. Moreover, in the case of the comparative example 4 which does not have the zinc-type coating layer (plating layer) 4, since a steel plate and the aluminum-type board are directly contacting, even if it irradiates with a laser beam, a melt-bonding will arise in an overlap part. There is nothing.

これに対し、実施例1は亜鉛系被覆層(めっき層)を有すると共に、先行レーザ光で亜鉛系被覆層のみが広い範囲で溶融したので、接合部の強度が十分に高く、破断位置がアルミニウム系板2側の母材部であった。   On the other hand, Example 1 has a zinc-based coating layer (plating layer) and only the zinc-based coating layer was melted in a wide range by the preceding laser beam, so that the strength of the joint is sufficiently high and the fracture position is aluminum. It was a base material part on the system board 2 side.

本発明の実施形態に係る異材接合方法を示す斜視図である。It is a perspective view which shows the different material joining method which concerns on embodiment of this invention. 同じくその接合部の断面図で、先行レーザ溶接後の状況を示す。Similarly, the cross-sectional view of the joint shows the situation after the preceding laser welding. 同じくその接合部の断面図で、後行熱源による溶接後の状況を示す。Similarly, the cross-sectional view of the joint shows the situation after welding with a subsequent heat source.

符号の説明Explanation of symbols

1:鋼板
2:アルミニウム系板
3:重ね部
4:亜鉛系被覆層
10:第1熱源
11:第2熱源
12,13:溶融部
1: Steel plate 2: Aluminum-based plate 3: Overlapping portion 4: Zinc-based coating layer 10: First heat source 11: Second heat source 12, 13: Melting portion

Claims (2)

アルミニウム又はアルミニウム合金からなるアルミニウム系被溶接材と、表面に亜鉛又は亜鉛合金からなる亜鉛系被覆層を有する鉄系被溶接材とを、前記アルミニウム系被溶接材の端部を前記鉄系被溶接材上に重ねて重ね継手を形成し、この重ね部を接合する異材接合方法において、レーザ光を前記重ね部の端部近傍の前記鉄系被溶接材の表面にアルミニウム系被溶接材側から照射して加熱する第1熱源と、前記重ね部の前記アルミニウム系被溶接材の表面を加熱する第2熱源とを、前記重ね部の端部に沿って前記第1熱源を前記第2熱源に先行させて移動させることにより、先行の第1熱源により前記重ね部の端部近傍の前記亜鉛系被覆層のみを溶融させた後、後行の第2熱源により前記重なり部の前記亜鉛系被覆層及び前記アルミニウム系被溶接材を溶融させることを特徴とする異材接合方法。 An aluminum-based welded material made of aluminum or an aluminum alloy, and an iron-based welded material having a zinc-based coating layer made of zinc or a zinc alloy on the surface, and an end portion of the aluminum-based welded material is welded to the iron-based welded material In a dissimilar material joining method in which a lap joint is formed by overlapping on a material, and the overlap portion is joined, a laser beam is irradiated on the surface of the iron-based welded material near the end of the overlapped portion from the aluminum-based welded material side A first heat source for heating and a second heat source for heating the surface of the aluminum-based welded material of the overlapped portion, and the first heat source preceding the second heat source along the end of the overlapped portion. And moving only the zinc-based coating layer in the vicinity of the end portion of the overlapping portion by the preceding first heat source, and then moving the zinc-based coating layer in the overlapping portion by the subsequent second heat source and Aluminum Dissimilar materials bonded method characterized by melting the material to be welded. 前記第1熱源は、CO、YAG、又は半導体のレーザ光熱源であり、前記第2熱源は、レーザ光、MIG溶接、TIG溶接、又はプラズマ溶接の熱源であることを特徴とする請求項1に記載の異材接合方法。 The first heat source is a CO 2 , YAG, or semiconductor laser light heat source, and the second heat source is a laser light, MIG welding, TIG welding, or plasma welding heat source. The dissimilar material joining method described in 1.
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