JP2008246577A - Method for joining precoated metallic sheets - Google Patents
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本発明は、家電、建材、自動車などに用いられる有機被覆金属板、無機被覆金属板、有機・無機被覆金属板など（本明細書ではこれらを総称して「プレコート金属板」という）の接合方法に関する。 The present invention relates to a method for joining organic coated metal plates, inorganic coated metal plates, organic / inorganic coated metal plates, etc. (generally referred to herein as “pre-coated metal plates”) used in home appliances, building materials, automobiles, etc. About.
家電、建材、自動車などのメーカーにおける塗装工程、あるいは施工現場における塗装工程を省略するために、あらかじめ鉄鋼メーカーや塗装メーカーで金属板上に必要な有機系や無機系の被覆層を形成したプレコート金属板の需要が増加している。しかし、このプレコート金属板は、一般的に被覆層に導電性がないため、スポット溶接による接合ができないという欠点を有している。このため、プレコート金属板の接合には、スポット溶接に代わって、かしめ、ビス、リベットなどによる機械的な接合が主流となっているが、その生産性は必ずしも高くなく、また、溶接に比べて継手強度も低い。 Pre-coated metal with an organic or inorganic coating layer formed on a metal plate in advance by a steel manufacturer or paint manufacturer in order to omit the painting process at manufacturers such as home appliances, building materials, and automobiles, or at the construction site The demand for plates is increasing. However, this precoated metal sheet generally has a drawback that it cannot be joined by spot welding because the coating layer is not electrically conductive. For this reason, mechanical joining by caulking, screws, rivets, etc. is the mainstream for joining precoated metal sheets, instead of spot welding, but its productivity is not necessarily high, and compared to welding The joint strength is also low.
一方、例えば、特許文献１や特許文献２に記載があるように、プレコート鋼板やクロム酸処理鋼板を接合する方法として、常温硬化型接着剤やポリアミド系接着剤を用いる接合方法が提案されている。
しかしながら、特許文献１や特許文献２などに提案されている接着剤を用いる接合方法によれば、生産性をかなり上げることは可能であるが、継手強度が低いために継手構造の設計に工夫が必要であり、高い生産性と高い継手強度とをともに安定して実現することが困難である。
金属板同士をレーザビームを用いて溶接接合する方法は広く用いられているが、この方法をプレコート金属板に適用すると、プレコート金属板表面に形成された有機、無機あるいは両者からなる被覆層がレーザビームにより激しく蒸発し、この被覆層を構成する物質の蒸気により溶融池の溶融金属が吹き飛ばされたり、この蒸気が溶融金属中に侵入して溶接部に多数のブローホールが発生する。また、被覆層が有機層の場合には、レーザビームにより分解した炭素が溶融金属中に入り、溶融部が硬化して、溶接部の延性や靭性などが劣化するという問題点がある。
However, according to the joining method using an adhesive proposed in
A method of welding and joining metal plates using a laser beam is widely used. However, when this method is applied to a pre-coated metal plate, a coating layer made of organic, inorganic, or both is formed on the surface of the pre-coated metal plate. The molten metal is vaporized vigorously by the beam, and the molten metal in the molten pool is blown off by the vapor of the material constituting the coating layer, or the vapor penetrates into the molten metal and a large number of blow holes are generated in the weld. Further, when the coating layer is an organic layer, there is a problem that carbon decomposed by the laser beam enters the molten metal, the molten portion is cured, and the ductility and toughness of the welded portion are deteriorated.
本発明は、高い生産性を有し、安定して高い継手強度が得られ、かつ外観にも優れるプレコート金属板の接合方法を提供することを目的とする。 An object of this invention is to provide the joining method of the precoat metal plate which has high productivity, can obtain stably high joint strength, and is excellent also in an external appearance.
上記目的は、２枚の金属板のうちの少なくとも１枚の少なくとも片面に有機または無機被覆層が形成されており、この被覆層を形成した面を重ね合わせ面に向けて隅肉溶接する２枚の金属板の重ね隅肉接合方法において、重ね合わせた隅肉接合部の上側の金属板の端部と、下側の金属板との間に隙間を形成した後、接合用ワイヤをレーザビームの照射により溶融させて隅肉接合するプレコート金属板の接合方法であって、上側の金属板の裏面の被覆層と下側の金属板の表面の被覆層の合計の膜厚ａに対し、接合箇所である重ね隅肉接合部の上側の金属板端部と下側の金属板との隙間ｄがａ／３≦ｄ≦1.0を満足し、かつ上板厚ｔ、ワイヤ径ｒ、ワイヤ供給速度ｖ、加工速度Ｗとしたときに、1.6×Ｗ（ｔ＋ｄ）2／ｒ2≦ｖ≦4.8×Ｗ（ｔ＋ｄ）2／ｒ2の関係を満足させることにより実現できる。 The object is to form an organic or inorganic coating layer on at least one surface of at least one of the two metal plates, and to weld fillet with the surface on which the coating layer is formed facing the overlapping surface In this method, the gap between the end of the upper metal plate of the overlapped fillet joint and the lower metal plate is formed, and then the bonding wire is connected to the laser beam. A method of joining a pre-coated metal plate that is melted by irradiation and is joined to the fillet, wherein the joining location is the total thickness a of the coating layer on the back surface of the upper metal plate and the coating layer on the surface of the lower metal plate. The gap d between the upper metal plate end and the lower metal plate of the overlapped fillet joint is a / 3 ≦ d ≦ 1.0, and the upper plate thickness t, the wire diameter r, and the wire supply speed v When the processing speed is W, 1.6 × W (t + d) 2 / r 2 ≦ v ≦ 4.8 × W (t + d) 2 / It can be realized by satisfying the relation r 2.
本発明により、導電性のない被覆層が形成されたプレコート金属板を高い生産性で接合でき、また、溶接欠陥もなく、安定して高い継手強度が得られる。 According to the present invention, a precoated metal sheet on which a coating layer having no conductivity is formed can be joined with high productivity, and there is no welding defect, and a high joint strength can be obtained stably.
本発明者らはさきに、このような導電性のない被覆層が形成されたプレコート金属板を、レーザビームの照射により被覆層を除去し、接合用ワイヤを供給して前記レーザにより溶融させて接合させ、高い生産性で、継手強度の高い接合部が得られるという知見を得、その内容は特願2005-191552号、特願2005-191553号に記載されている。
この接合法（以下「レーザブレージング法」という）では、金属板は表面から数μｍ程度の部分のみが溶融するだけで、金属板の内部は溶融しない。レーザ照射により金属板の接合界面の被覆層を十分に除去すれば、ろうの鋼板に対するぬれ性が確保できるため、接合は可能である。溶融金属中に接合界面の被覆層を構成する物質の蒸気が侵入することはないので、接合部に多数のブローホールが発生することはない。
The present inventors previously removed a pre-coated metal plate on which such a non-conductive coating layer has been formed by removing the coating layer by irradiating a laser beam, supplying a bonding wire, and melting it with the laser. The knowledge that joints with high productivity and high joint strength can be obtained is obtained, and the contents are described in Japanese Patent Application Nos. 2005-191552 and 2005-191553.
In this joining method (hereinafter referred to as “laser brazing method”), only a portion of the metal plate having a thickness of about several μm from the surface is melted, and the inside of the metal plate is not melted. If the coating layer at the bonding interface of the metal plate is sufficiently removed by laser irradiation, the wettability of the brazing steel plate can be ensured, so that bonding is possible. Since the vapor | steam of the substance which comprises the coating layer of a joining interface does not penetrate | invade in a molten metal, many blow holes do not generate | occur | produce in a junction part.
しかし、ビード表面のピット生成を完全に防止することはできないという問題点が残る。レーザ照射中に接合界面の被覆層は十分に除去されるものの、図３に示す説明図において、接合する上側の金属板（上板）１と下側の金属板（下板）２との重ね合わせ部で符号Ｒで示す「ルート部」付近に存在する被覆層が、レーザ照射が通過した後においても気化し続け、気化した蒸気４が図４のように凝固途中のろうに侵入することで、ピットが生成される。これは被覆層が金属板と比べ低融点であるため、余熱により気化し続けるためである。
However, there remains a problem that pit generation on the bead surface cannot be completely prevented. In the explanatory view shown in FIG. 3, the upper metal plate (upper plate) 1 and the lower metal plate (lower plate) 2 to be joined are overlapped in the explanatory view shown in FIG. The coating layer existing in the vicinity of the “root portion” indicated by the symbol R at the mating portion continues to vaporize even after the laser irradiation has passed, and the vaporized
そこで、本発明ではこのピット生成の防止対策として、上下板間に隙間を設けるようにした。図１に示すように、上下板間の被覆層１１、２１がレーザ照射の通過後に余熱により気化しても、矢印のようにこの隙間から排出されるため、ピットは生成されない。
隙間をつくる手段としては、さまざまの方法が考えられる。例えば上下板間に予め別の薄板をはさむ方法、上下板間に小塊あるいは小球を一様に配置する方法等である。上板あるいは下板に予め突起をつける方法もある。
Therefore, in the present invention, a gap is provided between the upper and lower plates as a countermeasure for preventing this pit generation. As shown in FIG. 1, even if the covering
Various methods can be considered as means for creating the gap. For example, there are a method in which another thin plate is sandwiched in advance between the upper and lower plates, a method in which small lumps or small spheres are uniformly arranged between the upper and lower plates, and the like. There is also a method of providing protrusions on the upper plate or the lower plate in advance.
このようにして隙間をつくり、ピットの生成を防止するには、上板の裏面の被覆層と下板の表面の被覆層の合計の膜厚ａ（mm）に対し、接合箇所である重ね隅肉接合部の上側の金属板端部と下側の金属板との隙間ｄ（mm）が
ａ／３≦ｄ≦1.0
を満足する必要がある。ｄが1.0mmを超えると隙間が大きすぎ、接合可能なレーザブレージングの条件を見出すことが困難となる。またｄがａ／３未満では蒸気の排出が十分に行われず、ピットが生成する。
In order to create a gap and prevent the formation of pits in this way, the overlapping corner, which is a joint, is applied to the total film thickness a (mm) of the coating layer on the back surface of the upper plate and the coating layer on the surface of the lower plate. The gap d (mm) between the upper metal plate end of the meat joint and the lower metal plate is a / 3 ≦ d ≦ 1.0.
Need to be satisfied. If d exceeds 1.0 mm, the gap is too large, and it becomes difficult to find a laser brazing condition that can be joined. If d is less than a / 3, the steam is not sufficiently discharged and pits are generated.
また上板厚ｔmm、ワイヤ径ｒmm、ワイヤ供給速度ｖｍ／min、加工速度Ｗｍ／minとしたとき、
1.6×Ｗ（ｔ＋ｄ）2／ｒ2≦ｖ≦4.8×Ｗ（ｔ＋ｄ）2／ｒ2 ・・・（ａ）
の関係を満足する必要がある。ｖ＜1.6×Ｗ（ｔ＋ｄ）2／ｒ2では、隙間を持つ板を接合するための「ろう（溶着金属）」の供給量が不十分であるため入熱過多となり、下板に熱変形が生じる。ｖ＞4.8×Ｗ（ｔ＋ｄ）2／ｒ2では「ろう」の供給量が多すぎるため、ろうが完全に溶融しない部分が生じ、ビード形成が不安定となる。
When the upper plate thickness is tmm, the wire diameter is rmm, the wire supply speed is vm / min, and the processing speed is Wm / min,
1.6 × W (t + d) 2 / r 2 ≦ v ≦ 4.8 × W (t + d) 2 / r 2 (a)
It is necessary to satisfy the relationship. When v <1.6 × W (t + d) 2 / r 2 , the amount of “brazing (welded metal)” for joining the plates with gaps is insufficient, resulting in excessive heat input and thermal deformation of the lower plate Arise. When v> 4.8 × W (t + d) 2 / r 2 , the supply amount of “wax” is too large, so that a portion where the braze does not melt completely occurs and bead formation becomes unstable.
以下に上記の（ａ）式を導入した過程を説明する。本発明で用いるワイヤの断面積はπｒ2／４であり、レーザブレージング後の接合部のろうの、接合進行方向に垂直な面の平均断面積（以下、接合部のろうの断面積とする）は、ワイヤ供給速度ｖに比例し、加工速度Ｗに反比例するため、πｖｒ2／４Ｗとなる。
一方、（ｔ＋ｄ）が増加すると、安定した形状を得るには、接合部のろうの断面積は（上板＋隙間）側と下板側との２次元的な増量が必要である。
The process of introducing the above formula (a) will be described below. Sectional area of the wire used in the present invention is pi] r 2/4, the brazing of the joint after the laser brazing, the average cross-sectional area of the plane perpendicular to the joining direction of travel (hereinafter, the wax of the cross-sectional area of the joint) Is proportional to the wire supply speed v and inversely proportional to the machining speed W, and is πvr 2 / 4W.
On the other hand, when (t + d) increases, in order to obtain a stable shape, the cross-sectional area of the solder at the joint needs to be increased two-dimensionally on the (upper plate + gap) side and the lower plate side.
したがって、接合部のろうの断面積を（ｔ＋ｄ）2に比例して増減させる必要があるため、πｖｒ2／４Ｗ∝（ｔ＋ｄ）2となり、Ａを定数として、
ｖ＝ＡＷ（ｔ＋ｄ）2／ｒ2
が成立する。
さらに実験によりＡの適正範囲を検討した結果、上記（ａ）式が得られたのである。
Therefore, since it is necessary to increase or decrease the cross-sectional area of the solder at the joint in proportion to (t + d) 2 , πvr 2 / 4W∝ (t + d) 2 , where A is a constant,
v = AW (t + d) 2 / r 2
Is established.
Furthermore, as a result of examining the appropriate range of A by experiment, the above formula (a) was obtained.
本発明で対象とするプレコート金属板は、金属板上の片面に、少なくとも１層の有機、無機、あるいは有機・無機複合型の被覆層が形成されているものである。また、プレコート金属板上に形成された被覆層のうち少なくとも片面の被覆層は、導電性がなく、通常のスポット溶接などの直接通電による接合ができない。接合の相手となる金属板は、プレコート金属板でもよいし、プレコート金属板とは異なる金属板でもよい。 The pre-coated metal plate to be used in the present invention has at least one organic, inorganic, or organic / inorganic composite coating layer formed on one surface of the metal plate. Further, at least one of the coating layers formed on the precoated metal plate is not electrically conductive and cannot be joined by direct energization such as normal spot welding. The metal plate to be joined may be a pre-coated metal plate or a metal plate different from the pre-coated metal plate.
プレコート金属板の原板や接合相手の金属板としては、たとえば、熱延鋼板、冷延鋼板や、鉛めっき鋼板、合金化溶融亜鉛めっき鋼板、亜鉛合金めっき鋼板、アルミめっき鋼板、クロムめっき鋼板、ニッケルめっき鋼板、銅めっき鋼板などのめっき鋼板、およびステンレス鋼板、アルミ板、銅板、アルミ合金板などが挙げられる。
被覆層としては、例えば、ポリエステル樹脂系、エポキシ樹脂系、アクリル樹脂系、ウレタン樹脂系、フッ素樹脂系、エーテル樹脂系、硫黄樹脂系、塩化ビニル樹脂系、オレフィン樹脂系、ケトン樹脂系、シリコン樹脂などの有機被覆層や、シロキサン系、ボロン系、ボロシロキサン系などの無機被覆層が挙げられる。シロキサン、ボロシロキサンなどの無機材料を有機樹脂中に導入したような有機・無機複合被覆層にも本発明は適用できる。
Examples of the pre-coated metal plate and the metal plate to be joined include hot-rolled steel plate, cold-rolled steel plate, lead-plated steel plate, alloyed hot-dip galvanized steel plate, zinc alloy-plated steel plate, aluminum-plated steel plate, chrome-plated steel plate, nickel Examples thereof include plated steel sheets such as plated steel sheets and copper plated steel sheets, and stainless steel sheets, aluminum plates, copper plates, and aluminum alloy plates.
Examples of the coating layer include polyester resin, epoxy resin, acrylic resin, urethane resin, fluorine resin, ether resin, sulfur resin, vinyl chloride resin, olefin resin, ketone resin, and silicon resin. And organic coating layers such as siloxane-based, boron-based, and borosiloxane-based inorganic coating layers. The present invention can also be applied to an organic / inorganic composite coating layer in which an inorganic material such as siloxane or borosiloxane is introduced into an organic resin.
こうした被覆層は、塗料を金属板上に塗布して硬化乾燥したり、あらかじめ被覆材料をフィルム状にしたものを金属板上に貼り付ける方法で形成できる。
本発明に用いるレーザ発振機は、溶接に用いるため200ワット以上、好ましくは数キロワットの出力が必要である。レーザの種類としては、レーザ光生成媒体としてYAGロッドを用いてハロゲンランプなどでレーザ光を励起するタイプや、レーザダイオード（LD）でレーザ光を励起するタイプのYAGレーザが好ましい。その他に、炭酸ガスレーザ、スラブレーザ、ルビーレーザ、エキシマレーザ、半導体レーザなどを用いることができる。光学系には、偏向用反射ミラーと数枚の正負の収束レンズを組み合わせた光学系を備えるものが好ましいが、レンズ系を用いずに凹面鏡と凸面鏡との組み合わせだけでレーザ光を収束させても良い。
Such a coating layer can be formed by applying a paint on a metal plate and curing and drying, or by pasting a coating material in the form of a film on the metal plate.
The laser oscillator used in the present invention requires an output of 200 watts or more, preferably several kilowatts, for use in welding. As the type of laser, a YAG laser that excites laser light with a halogen lamp or the like using a YAG rod as a laser light generation medium or a type that excites laser light with a laser diode (LD) is preferable. In addition, a carbon dioxide laser, a slab laser, a ruby laser, an excimer laser, a semiconductor laser, or the like can be used. The optical system preferably includes an optical system that combines a deflecting reflecting mirror and several positive and negative converging lenses, but even if the laser beam is converged only by a combination of a concave mirror and a convex mirror without using a lens system. good.
接合用ワイヤについては、純Cuろう、Cu-Zn合金ろう、Cu-Ｐ合金ろう、Cu-Si合金ろう、Cu-Sn合金ろう、Cu-Ni合金ろうなどのCu系ろう材やAg-Cu合金ろうなどのAg系ろう材など、いずれのろう材も使用可能である。ろう付け時のシールドガスには、溶融金属の酸化防止のために、アルゴンガスなどの不活性ガスを用いることが望ましいが、アルゴンガス中に炭酸ガスを10〜100％の範囲で混合させたガス（100％の場合は炭酸ガスのみ）、あるいはアルゴンガス中に水素ガスやヘリウムガスを２〜20％の範囲で混合させたガスを用いることもできる。 For joining wires, Cu-based brazing materials such as pure Cu brazing, Cu-Zn alloy brazing, Cu-P alloy brazing, Cu-Si alloy brazing, Cu-Sn alloy brazing, Cu-Ni alloy brazing, and Ag-Cu alloys Any brazing material can be used, such as an Ag-based brazing material such as brazing. In order to prevent oxidation of molten metal, it is desirable to use an inert gas such as argon gas as the shielding gas at the time of brazing, but a gas in which carbon dioxide gas is mixed in the range of 10 to 100% in argon gas. (In the case of 100%, only carbon dioxide gas) or a gas in which hydrogen gas or helium gas is mixed in the range of 2 to 20% in argon gas can also be used.
プレコート金属板の原板として、厚みが0.8mm、片面のめっき付着量が60ｇ／ｍ2の溶融亜鉛めっき鋼板に、20ｇ／ｍ2のクロム付着量となるようにクロメート処理を両面に施した鋼板を用いた。この鋼板の表面に、ポリエステル樹脂系のプライマ塗料を両面に乾燥塗膜が７〜20μｍとなるように塗布し、乾燥・硬化させてプレコート金属板を作製した。
このプレコート金属板を２枚重ねて、YAGレーザを用いて表１に示す条件でレーザブレージングによる隅肉接合を行って試料No.１〜２1を作製した。ろう材には線径1.2mmのCu-3.5mass％Si-１mass％Mn系ワイヤ（JIS Z 3341、ワイヤ種ＹCuSiＢ）を用いた。ワイヤ供給速度ｖ、加工速度Ｗ、上下間の隙間ｄを表１のように変化させた。
As a pre-coated metal sheet, a steel sheet that has a thickness of 0.8 mm and one side coated with a galvanized steel sheet with a coating amount of 60 g / m 2 and chromate treatment on both sides to a chromium coating amount of 20 g / m 2. Using. A polyester resin primer coating was applied to the surface of this steel plate so that the dry coating film would be 7 to 20 μm on both sides, and dried and cured to prepare a precoated metal plate.
Samples Nos. 1 to 21 were prepared by stacking two precoated metal plates and performing fillet joining by laser brazing under the conditions shown in Table 1 using a YAG laser. A Cu-3.5 mass% Si-1 mass% Mn-based wire (JIS Z 3341, wire type YCuSiB) having a wire diameter of 1.2 mm was used as the brazing material. The wire supply speed v, the processing speed W, and the gap d between the upper and lower sides were changed as shown in Table 1.
接合部の外観を評価するために、目視により溶接ビード表面のピットを調査した。溶接長300ｍｍで直径１ｍｍ以上のピットが3つ以上形成された場合、母材の熱変形が大きかった場合、ビード幅が一定とならずビード形状が不安定であった場合、あるいは接合しなかった場合は×と評価した。一方直径１ｍｍ以上のピットが2つ以下で、ビード幅がほぼ一定であった場合は○と評価した。 In order to evaluate the appearance of the joint, the pits on the surface of the weld bead were visually examined. When 3 or more pits with a weld length of 300 mm and a diameter of 1 mm or more were formed, when the base material had large thermal deformation, when the bead width was not constant and the bead shape was unstable, or did not join The case was evaluated as x. On the other hand, when the number of pits having a diameter of 1 mm or more was 2 or less and the bead width was almost constant, the evaluation was “good”.
また、図２に示すような形状の引張試験を行い、JIS Z 3136に準じた引張せん断試験を行い継手強度を求めた。継手強度が270ＭPa以上の場合は○、270ＭPa未満の場合は×と評価した。結果を表１に示す。試料No.１〜４では、隙間を設定していない、もしくは隙間ｄmmがｄ＜ａ／３であるため、気化した皮膜を十分に除去することができず、ビード表面にピットが生成する。試料No.５、６では、隙間ｄがｄ＞１ｍｍと大きすぎるため、安定したビード幅を得られる条件、もしくは接合が可能な条件を見出すことが困難である。 Moreover, the tensile test of the shape as shown in FIG. 2 was conducted, the tensile shear test according to JIS Z 3136 was conducted, and the joint strength was obtained. When the joint strength was 270 MPa or more, it was evaluated as ◯, and when it was less than 270 MPa, it was evaluated as ×. The results are shown in Table 1. In Samples Nos. 1 to 4, the gap was not set or the gap dmm was d <a / 3, so the vaporized film could not be sufficiently removed, and pits were generated on the bead surface. In Samples Nos. 5 and 6, since the gap d is too large as d> 1 mm, it is difficult to find a condition for obtaining a stable bead width or a condition capable of joining.
試料No.７ではワイヤ供給速度ｖがｖ＜1.6×Ｗ（ｔ＋ｄ）2/ｒ2であるため、ワイヤ供給量の不足により入熱量が過多となり、下板に熱変形が生じる。試料No.８、９では、ｖ＞4.8×Ｗ（ｔ＋ｄ）2/ｒ2と、ろうの供給量が過多であるため、ろうが完全に溶融しない部分が生じ、ビード形状が不安定になる。
一方、本発明の接合方法により作製された試料No.１０〜２１では、隙間ｄがａ/３≦ｄ≦1.0mmを満たし、かつワイヤ供給速度ｖが1.6×Ｗ（ｔ＋ｄ）2／ｒ2≦ｖ≦4.8×Ｗ（ｔ＋ｄ）2／ｒ2を満たすため、直径１ｍｍ以上のピットが２つ以下で、ビード幅がほぼ一定の良好なビード外観となり、引張せん断試験における継手強度が270ＭPa以上となる。
In sample No. 7, since the wire supply speed v is v <1.6 × W (t + d) 2 / r 2 , the heat input amount is excessive due to the shortage of the wire supply amount, and the lower plate is thermally deformed. In Samples Nos. 8 and 9, v> 4.8 × W (t + d) 2 / r 2, and the brazing supply amount is excessive, so that a portion where the brazing is not completely melted occurs and the bead shape becomes unstable.
On the other hand, in sample Nos. 10 to 21 produced by the joining method of the present invention, the gap d satisfies a / 3 ≦ d ≦ 1.0 mm, and the wire supply speed v is 1.6 × W (t + d) 2 / r 2 ≦ In order to satisfy v ≦ 4.8 × W (t + d) 2 / r 2 , a good bead appearance is obtained with two or less pits having a diameter of 1 mm or more and a bead width almost constant, and a joint strength in a tensile shear test is 270 MPa or more. .
１ 上板（金属板）
２ 下板（金属板）
３ ろう（溶着金属）
４ （被覆層の）蒸気
１１、２１ 被覆層
Ｒ ルート部
1 Upper plate (metal plate)
2 Lower plate (metal plate)
3 Brazing (welded metal)
4
Claims (1)
上側の金属板の裏面の被覆層と下側の金属板の表面の被覆層との合計の膜厚ａ（ｍｍ）に対し、接合箇所である重ね隅肉接合部の上側の金属板端部と下側の金属板との隙間ｄ（ｍｍ）が
ａ／３≦ｄ≦1.0
を満足し、かつ上板厚ｔ（ｍｍ）、ワイヤ径ｒ（ｍｍ）、ワイヤ供給速度ｖ（ｍ／min）、加工速度Ｗ（ｍ／min）としたときに、
1.6×Ｗ（ｔ＋ｄ）2／ｒ2≦ｖ≦4.8×Ｗ（ｔ＋ｄ）2／ｒ2
の関係を満足させることを特徴とするプレコート金属板の接合方法。 An organic or inorganic coating layer is formed on at least one surface of at least one of the two metal plates, and the two metal plates that are fillet welded with the surface on which the coating layer is formed facing the overlapping surface In the overlapped fillet joining method, after forming a gap between the upper metal plate end of the overlapped fillet joint and the lower metal plate, the bonding wire is melted by laser beam irradiation. A pre-coated metal plate joining method for fillet joining,
For the total film thickness a (mm) of the coating layer on the back surface of the upper metal plate and the coating layer on the surface of the lower metal plate, The gap d (mm) between the lower metal plate is a / 3 ≦ d ≦ 1.0
And an upper plate thickness t (mm), a wire diameter r (mm), a wire supply speed v (m / min), and a processing speed W (m / min),
1.6 × W (t + d) 2 / r 2 ≦ v ≦ 4.8 × W (t + d) 2 / r 2
A pre-coated metal sheet joining method characterized by satisfying the relationship:
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011031298A (en) * | 2009-08-06 | 2011-02-17 | Suzuki Motor Corp | Laser beam brazing apparatus and method |
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|---|---|---|---|---|
| JPH10193149A (en) * | 1997-01-16 | 1998-07-28 | Hitachi Lighting Ltd | Laser welding method |
| JP2004082214A (en) * | 2002-06-27 | 2004-03-18 | Sumitomo Metal Ind Ltd | Joining raw material, method for manufacturing the same, joined articles and method for manufacturing the same |
| JP2005059009A (en) * | 2003-08-11 | 2005-03-10 | Nissan Motor Co Ltd | Laser brazing method and device |
| JP2007007690A (en) * | 2005-06-30 | 2007-01-18 | Jfe Steel Kk | Method for joining precoated metallic sheet |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10193149A (en) * | 1997-01-16 | 1998-07-28 | Hitachi Lighting Ltd | Laser welding method |
| JP2004082214A (en) * | 2002-06-27 | 2004-03-18 | Sumitomo Metal Ind Ltd | Joining raw material, method for manufacturing the same, joined articles and method for manufacturing the same |
| JP2005059009A (en) * | 2003-08-11 | 2005-03-10 | Nissan Motor Co Ltd | Laser brazing method and device |
| JP2007007690A (en) * | 2005-06-30 | 2007-01-18 | Jfe Steel Kk | Method for joining precoated metallic sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011031298A (en) * | 2009-08-06 | 2011-02-17 | Suzuki Motor Corp | Laser beam brazing apparatus and method |
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