JP2008000754A - Method and structure of joining different kinds of metal - Google Patents

Method and structure of joining different kinds of metal Download PDF

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JP2008000754A
JP2008000754A JP2006169567A JP2006169567A JP2008000754A JP 2008000754 A JP2008000754 A JP 2008000754A JP 2006169567 A JP2006169567 A JP 2006169567A JP 2006169567 A JP2006169567 A JP 2006169567A JP 2008000754 A JP2008000754 A JP 2008000754A
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joining
joint
sealing material
materials
dissimilar metals
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JP4961531B2 (en
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Kenji Miyamoto
健二 宮本
Nariyuki Nakagawa
成幸 中川
Akira Fukushima
晃 福島
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Nissan Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of joining different metals by which the corrosion (electric corrosion) caused by contact of the different metals is prevented and a different material joint excellent in corrosion resistance and bonding strength is obtained in a member which is composed by joining the different metals, and to provide a joining structure by such a method. <P>SOLUTION: When superimposing and joining the different metals, welding is performed in the state where a sealant 5 is arranged so as to encircle the predetermined joining part 1a between the different metal materials 1, 2. At this time, desirably, after forming a recessed part 3a or a projecting part 4a so as to encircle the predetermined joining part 1a on the joint surface of the material 1, the sealant 5 is arranged around the recessed part 3a or the projecting part 4a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、イオン化傾向の異なる金属からなる異種材料の接合方法と、このような方法によって得られる異種金属の接合構造に関するものである。   The present invention relates to a method for joining dissimilar materials made of metals having different ionization tendencies and a dissimilar metal joining structure obtained by such a method.

例えば、自動車車体には、従来から鋼材が広く使用されているが、これに加えて、近年、車体の軽量化を目的として、アルミニウム合金などの軽金属の利用が進んでおり、アルミニウム合金等で形成された車体部材(例えば、アルミニウム合金製ルーフパネル等)の車体への適用が行われている。   For example, steel materials have been widely used for automobile bodies, but in addition to this, in recent years, the use of light metals such as aluminum alloys has been promoted for the purpose of reducing the weight of automobile bodies, and formed of aluminum alloys and the like. The applied vehicle body member (for example, an aluminum alloy roof panel) is applied to the vehicle body.

これら部材の接合部位に上記のような異種金属を組み合わせて用いると、異種金属が互いに接触して電気的に導通するために腐食が促進されることが知られている。
このような異種金属の接触による腐食は、金属のイオン化傾向の違いによってこれら金属間に電位差が生じ、腐食電流が流れることによって発生するとされており、従来、異種金属接触による腐食を防止するために、以下のような対策が知られている。
It is known that when different kinds of metals as described above are used in combination at the joint portions of these members, the different kinds of metals come into contact with each other and are electrically connected to accelerate corrosion.
Corrosion due to contact of different metals is considered to occur when a potential difference occurs between these metals due to the difference in the ionization tendency of the metals, and a corrosion current flows. Conventionally, in order to prevent corrosion due to different metal contacts, The following measures are known.

すなわち、特許文献1には、例えばスチール製の第1の部材と、例えばアルミニウムやその合金から成る第2の部材を両部材の間にシール材を介在させた状態で、例えばリベットや補強部材などの接合手段によって接合するようにした車体部材の接合構造が提案されている。
また、特許文献2には、鉄系材料とアルミニウム又はアルミニウム合金材料が接合された部材をフルオロ錯イオン及び亜鉛イオンを含有する溶液中に浸漬して、接合部近傍に緻密かつ強固で密着性が高く、しかもアルミニウムと鉄との中間的なイオン化傾向を有する金属亜鉛を析出させ、もって接合部における異種金属接触耐食性を向上させることが記載されている。
特開2000−272541号公報 特開2005−154844号公報
That is, in Patent Document 1, for example, a first member made of steel and a second member made of aluminum or an alloy thereof, for example, with a sealant interposed between the two members, for example, a rivet or a reinforcing member There has been proposed a joining structure for vehicle body members that is joined by the joining means.
In Patent Document 2, a member in which an iron-based material and aluminum or an aluminum alloy material are bonded is immersed in a solution containing a fluoro complex ion and zinc ion, and a dense, strong, and adhesive layer is formed in the vicinity of the bonded portion. It is described that metal zinc having a high ionization tendency between aluminum and iron is deposited, thereby improving the corrosion resistance of different metals at the joint.
JP 2000-272541 A JP 2005-154844 A

しかしながら、上記特許文献1に記載の技術においては、両材料の融点や線膨張係数が異なることから、スポット溶接等の溶融接合を避け、リベットやボルトなどの機械的締結を採用しているため、接合された部材の重量やコストが増加するという問題点がある。
また、特許文献2に記載の技術においては、接合された部材をフルオロ錯イオン及び亜鉛イオンを含有する溶液中に浸漬するようにしているが、接合材表面に析出した亜鉛だけでは、自動車部品に求められる耐食性能を十分に満足させることができないばかりでなく、自動車の生産工程の過程において、車体部品をこのような溶液中に浸漬する工程を組み込むことは、浸漬タンク等の新たな設備投資を必要とし、コストが増加することが問題となる。
However, in the technique described in Patent Document 1, since the melting point and the linear expansion coefficient of both materials are different, it avoids fusion bonding such as spot welding and employs mechanical fastening such as rivets and bolts. There is a problem that the weight and cost of the joined members increase.
Further, in the technique described in Patent Document 2, the joined member is immersed in a solution containing a fluoro complex ion and zinc ion. However, only zinc deposited on the surface of the joining material is used for an automobile part. In addition to not being able to fully satisfy the required corrosion resistance performance, incorporating a process of immersing car body parts in such a solution during the production process of automobiles will lead to new capital investments such as immersion tanks. Necessary and cost increases.

本発明は、従来の異種金属の接合技術における上記課題に鑑みてなされたものであって、その目的とするところは、異種金属接触による腐食を防止することができ、耐食性及び接合強度に優れた異材継手を安価に得ることができる異種金属の接合方法と、このような方法による接合構造を提供することにある。   The present invention has been made in view of the above-mentioned problems in conventional dissimilar metal joining technology, and the object of the present invention is to prevent corrosion due to dissimilar metal contact and to be excellent in corrosion resistance and joint strength. It is an object to provide a joining method of dissimilar metals that can obtain a dissimilar material joint at low cost, and a joining structure by such a method.

本発明者らは、上記目的を達成すべく鋭意検討を重ねた結果、重ね合わせた異種金属材料の間の接合部が形成される部位以外の部分にシール材を介在させることによって、上記目的が解決できることを見出し、本発明を完成するに到った。   As a result of intensive investigations to achieve the above object, the present inventors have achieved the above object by interposing a sealing material in a portion other than the part where the joint between the different dissimilar metal materials is formed. The inventors have found that this can be solved, and have completed the present invention.

すなわち、本発明は上記知見に基づくものであって、本発明の異種金属の接合方法においては、異種金属から成る材料を重ね接合するに際して、重ね合わせた両材料の間に、接合予定部位を囲むようにシール材を配置したうえで、溶接することを特徴としている。
また、本発明の異種金属の接合構造は、このような方法によって得られるものであって、重ね合わせた両材料間に、接合部を囲んだ状態にシール材が介在していることを特徴とする。
That is, the present invention is based on the above knowledge, and in the method for joining dissimilar metals according to the present invention, when materials composed of dissimilar metals are lap-joined, a portion to be joined is surrounded between the overlapped materials. As described above, the sealing material is arranged and then welded.
In addition, the dissimilar metal joining structure of the present invention is obtained by such a method, and is characterized in that a sealing material is interposed between the overlapped materials so as to surround the joining portion. To do.

本発明によれば、異種金属材料を重ね接合するに際して、重ね合わせた両材料の間に、接合予定部位を囲むようにシール材を配置し、この状態で溶接するようにしていることから、イオン化傾向の異なる金属同士が接触したり、接合部にシール材が残存したりするようなことがなく、耐食性及び接合強度に優れた異種金属継手を低コストに作製することができる。   According to the present invention, when different metal materials are lap-joined, a sealing material is disposed between the two overlapped materials so as to surround a site to be joined, and welding is performed in this state. It is possible to produce a dissimilar metal joint excellent in corrosion resistance and bonding strength at low cost without contacting metals having different tendencies or leaving a sealing material at the joint.

以下に、本発明の異種金属の接合方法や接合構造について、さらに詳細かつ具体的に説明する。   The dissimilar metal bonding method and bonding structure of the present invention will be described in more detail and specifically below.

本発明の異種金属接合方法においては、上記したように、重ね合わせた異種金属材料の間に、接合予定部位を囲むように、言い換えると接合部が形成される位置を避けて、その周りにシール材を配置し、接合部位にシール材がない状態で溶接するようにしているので、接合界面にシール材が残存することによる継手強度の低下が防止されると共に、シール材によってイオン化傾向の異なる金属同士の接触を防止することができ、強度と耐食性の両立が可能となる。このとき、新たな設備の増設なども特に必要とせず、シール材のコストや、その配置工数など、コストアップ要因も最小限に抑えることができる。   In the dissimilar metal bonding method according to the present invention, as described above, a portion to be bonded is surrounded between the overlapped dissimilar metal materials, in other words, a position where the bonding portion is formed is avoided and the periphery is sealed. Since the material is arranged and welded in a state where there is no sealing material at the joining site, it is possible to prevent the joint strength from being lowered due to the sealing material remaining at the joining interface, and to have different ionization tendency depending on the sealing material. Contact between each other can be prevented, and both strength and corrosion resistance can be achieved. At this time, it is not particularly necessary to add new equipment, and cost increase factors such as the cost of the sealing material and the number of man-hours for the sealing can be minimized.

本発明の接合方法において、上記シール材としては、例えば、エポキシ樹脂系、合成ゴム系、合成ゴム/PVC系材料などを用いることができ、このような材料を溶液状にして被接合材料の接合面に塗布したり、シート状にしたものを両材料の間に挟んだりすることができる。
この場合、シール材の塗布に際しては、被接合材の接合予定部位、つまり接合部が形成される位置を避けて塗布することが必要であり、シート状のシール材には、接合予定部位に相当する個所に貫通孔を予め形成しておくことが必要となる。
In the joining method of the present invention, as the sealing material, for example, an epoxy resin-based material, a synthetic rubber-based material, a synthetic rubber / PVC-based material, or the like can be used. It can be applied to the surface or sandwiched between the two materials.
In this case, when applying the sealing material, it is necessary to apply the portion to be bonded to avoid joining the portion to be bonded, that is, the position where the bonding portion is formed. It is necessary to form a through hole in advance at the location to be performed.

なお、本発明の目的を達成できるものであれば、これらに限定されることはない。
また、当該シール材に接着機能を有する材料を用いることによって、電食を防止するシール効果に加えて、接合強度を向上させることが可能となる。
In addition, as long as the objective of this invention can be achieved, it will not be limited to these.
Further, by using a material having an adhesive function for the sealing material, it is possible to improve the bonding strength in addition to the sealing effect for preventing electrolytic corrosion.

また、本発明の接合方法においては、被接合材の接合予定部位に接合面側に突出する凸部を形成したり、被接合材の接合面に凸部や凹部を接合予定部位を取り囲む状態に形成したりすることが望ましく、このような凸部や凹部を接合面に予め形成しておくことによって、シール材塗布の位置決めや、塗布量の制御、貫通孔を備えたシート状シール材の位置決めが容易なものとなり、作業効率の向上、工数低減などが可能になる。
なお、被接合材の接合予定部位に形成する凸部の形状としては、例えば円弧状に湾曲した面を備えていることが望ましく、これによって、接合面に介在する酸化皮膜や接合過程で生じる種々の反応生成物などの接合部からの排出性が向上し、高強度な接合部を得ることができる。
Further, in the joining method of the present invention, a convex portion protruding toward the joining surface is formed at the planned joining portion of the material to be joined, or the convex portion or the concave portion is surrounded on the joining surface of the joined material around the planned joining portion. It is desirable to form such protrusions and recesses on the joint surface in advance, thereby positioning the sealing material, controlling the coating amount, and positioning the sheet-like sealing material with through holes. This makes it easy to improve work efficiency and reduce man-hours.
In addition, as a shape of the convex part formed in the to-be-joined site | part of a to-be-joined material, it is desirable to provide the surface curved, for example in circular arc shape, and, thereby, the oxide film which intervenes in a joining surface, and various kinds produced in joining processes The discharge property of the reaction product and the like from the joint is improved, and a high-strength joint can be obtained.

本発明の異種金属の接合方法において、溶接方法については特に限定されることはなく、抵抗溶接、レーザ溶接、高周波溶接などの溶融溶接だけでなく、摩擦攪拌接合、超音波接合、拡散接合などの固相接合まで、種々の溶接施工方法の適用が可能であり、接合施工方法に限定されるものではない。   In the dissimilar metal joining method of the present invention, the welding method is not particularly limited, and includes not only fusion welding such as resistance welding, laser welding, and high frequency welding, but also friction stir welding, ultrasonic joining, diffusion joining, and the like. Various welding methods can be applied up to the solid phase bonding, and the method is not limited to the bonding method.

本発明の異種金属の接合構造は、重ね合わせた異種金属材料の間に、接合部を囲んだ状態にシール材が介在しているものであって、上記した本発明の接合方法によって得ることができ、上記したように、優れた耐食性と強度を兼ね備えたものとなる。   The joining structure of dissimilar metals according to the present invention is such that a sealing material is interposed between the dissimilar metal materials overlapped so as to surround the joint, and can be obtained by the joining method of the present invention described above. And as described above, it has excellent corrosion resistance and strength.

本発明の接合構造においては、接合部を点(スポット)状のものとし、この点状接合部を囲んで凹部又は凸部が形成され、当該凹部又は凸部の周囲にシール材が介在するようにすることができ、次に述べる複数の点接合部を纏めて取り囲む構造に較べて、接合部により近い位置にシール材を配置することができるので、より高い防水、耐食性能を発揮させることができる。
一方、上記した凹部又は凸部を隣接する複数の点状接合部の周囲を囲むように設けることもでき、この場合には、シール材によって複数の点接合部を纏めて外気と遮断することができることから、作業効率が向上することになる。
In the joint structure of the present invention, the joint is made into a spot (spot) shape, and a concave portion or a convex portion is formed surrounding the dotted joint portion, and a sealing material is interposed around the concave portion or the convex portion. Compared to the structure that collectively encloses the plurality of point joints described below, the seal material can be disposed at a position closer to the joint part, so that higher waterproof and corrosion resistance can be exhibited. it can.
On the other hand, it is also possible to provide the above-described recesses or projections so as to surround the periphery of a plurality of adjacent point-like joints. In this case, the plurality of point-joint parts can be collectively blocked from the outside by a sealing material. As a result, work efficiency is improved.

さらには、接合部を線状のものとし、この線状接合部を囲んで凹部又は凸部が形成され、当該凹部又は凸部の周囲にシール材が介在するようにすることもでき、連続した線接合や、断続線状(ステッチ)の接合においても、優れた耐食性と強度を両立させることが可能になる。   Furthermore, the joint portion is linear, and a concave portion or a convex portion is formed surrounding the linear joint portion, and a sealing material can be interposed around the concave portion or the convex portion, and is continuous. It is possible to achieve both excellent corrosion resistance and strength in wire bonding and intermittent wire (stitch) bonding.

また、上記凹部又は凸部を押し潰し、その周囲に介在するシール材を両材料に密着させることもでき、このような接合構造とすることによって、両材料、接合部、シール材相互の密着性が高まり、より高い防水、耐食性能を発揮することができるようになる。
さらに、接合部の周囲に形成した凹部の接合部側の縁を接合面に対して略垂直に立ち上がり、接合部の内部にシール材が侵入していかない構造とすることができ、これによって接合後の接合界面にはシール材が残存せず、しかも接合部に近い位置にシール材を位置させることができるので、より高い防水、耐食性能を発揮することができ、強度低下の防止と優れた耐食性を両立することが可能となる。
In addition, the concave portion or the convex portion can be crushed and the sealing material interposed around the concave portion or the convex portion can be adhered to both materials. By adopting such a joint structure, the adhesiveness between the two materials, the joint portion, and the sealing material can be obtained. As a result, higher waterproofness and corrosion resistance can be exhibited.
Furthermore, the edge on the joint side of the recess formed around the joint can rise substantially perpendicular to the joint surface so that the sealing material does not enter the inside of the joint. No sealant remains at the joint interface, and the sealant can be located at a position close to the joint, so it can exhibit higher waterproofing and corrosion resistance, preventing strength reduction and excellent corrosion resistance It is possible to achieve both.

以下、本発明を実施例に基づいて具体的に説明する。なお、本発明は、これら実施例に限定されるものではない。例えば、下記実施例においては、アルミニウム合金と亜鉛めっき鋼板の接合例を示したが、異種金属の組み合わせとしては、上記組み合わせ以外にも、マグネシウム合金とアルミニウム合金、鋼材とマグネシウム合金など、電食が問題となる全ての異種金属接合に適用することができる。
また、次に述べるように、点接合には抵抗スポット溶接、線接合には抵抗シーム溶接といった接合工法を用いたが、接合工法に関してもこれらのみに限定される訳ではなく、このような重ね接合が実施可能な全ての接合工法を適用することができる。
Hereinafter, the present invention will be specifically described based on examples. The present invention is not limited to these examples. For example, in the following examples, an example of joining an aluminum alloy and a galvanized steel sheet was shown. However, as a combination of different metals, in addition to the above combinations, electrolytic corrosion such as magnesium alloy and aluminum alloy, steel material and magnesium alloy, etc. It can be applied to all dissimilar metal joints in question.
In addition, as described below, the joining method such as resistance spot welding and resistance seam welding was used for spot joining, but the joining method is not limited to these. All the bonding methods that can be implemented are applicable.

図1及び図2は、本発明の実施例に用いた抵抗スポット溶接装置及び抵抗シーム溶接装置の全体構造をそれぞれ示すものであって、ここでは、いずれも交流電源タイプのものを使用し、板厚0.55mmの亜鉛めっき鋼板1と板厚1.0mmの6000系アルミニウム合金板材2を接合した。   1 and 2 show the overall structures of a resistance spot welding device and a resistance seam welding device used in the embodiments of the present invention, respectively, where both are AC power supply type plates, A galvanized steel sheet 1 having a thickness of 0.55 mm and a 6000 series aluminum alloy sheet 2 having a thickness of 1.0 mm were joined.

(実施例1)
図3(a)及び(b)に示すように、亜鉛めっき鋼板1の接合面側に、凹部3aを接合予定部位1aを囲むようなリング状に形成し、この凹部3aの内側を除く外側部分に、エポキシ樹脂系接着剤をシール材5としてを塗布した。
なお、この凹部3aの接合予定部位側の内側縁Wは、接合面に対してほぼ垂直に立ち上がっており、凹部3aの内側、すなわち接合予定部位1aの内部にシール材4が侵入していかない構造となっている。
(Example 1)
As shown in FIGS. 3 (a) and 3 (b), on the joining surface side of the galvanized steel sheet 1, the recess 3a is formed in a ring shape surrounding the planned joining portion 1a, and the outer portion excluding the inside of the recess 3a. Then, an epoxy resin adhesive was applied as the sealing material 5.
In addition, the inner edge W of the concave portion 3a on the planned joining portion side rises substantially perpendicular to the joining surface, and the seal material 4 does not penetrate into the concave portion 3a, that is, inside the planned joining portion 1a. It has become.

そして、アルミニウム合金材2と重ねあわせ、図1に示した抵抗スポット溶接装置を用いて、300kgfの加圧力を加えながら、24000Aの交流電流を0.24秒間通電することによって、両材料1,2を接合予定部位1aにおいてスポット溶接したのち、形成された溶接ナゲット部6(接合部)の周囲にリング状に突出した部分(凹部3aの裏面側)を矢印方向に押し潰しシール材5を両材料1,2に密着させた。   Then, by superposing the aluminum alloy material 2 and applying a 24000 A alternating current for 0.24 seconds while applying a pressure of 300 kgf using the resistance spot welding apparatus shown in FIG. After spot welding at the site to be joined 1a, the portion projecting in a ring shape (the back side of the recess 3a) around the formed weld nugget 6 (joint) is crushed in the direction of the arrow, and the sealing material 5 is used as both materials. It was made to adhere to 1 and 2.

この実施例においては、亜鉛めっき鋼板1に凹部3aを設けたことによって、シール材5を塗布する際の位置決め、塗布量の制御が容易となり作業効率が向上した。そして、凹部3aを点接合部6の周囲を囲んで設けることによって、接合部6に近い位置にシール材5を配置することができるのでより高い防水、耐食性能を発揮することができた。
そして、この場合、接合部6に近い側の縁Wが接合面に対して略垂直に立ち上がっていることから、シール材が侵入せず、接合後の接合界面にシール剤が残存することがなく、しかも、上記のように接合部6に近い位置にシール5を配置することができるので、より高い防水、耐食性能を発揮することができた。
In this embodiment, the provision of the recesses 3a in the galvanized steel sheet 1 facilitates the positioning and application amount control when applying the sealing material 5 and improves the working efficiency. And by providing the recessed part 3a surrounding the circumference | surroundings of the point junction part 6, since the sealing material 5 can be arrange | positioned in the position close | similar to the junction part 6, higher waterproof and corrosion resistance performance could be exhibited.
In this case, since the edge W on the side close to the joining portion 6 stands substantially perpendicular to the joining surface, the sealing material does not enter and the sealing agent does not remain at the joining interface after joining. And since the seal | sticker 5 can be arrange | positioned in the position close | similar to the junction part 6 as mentioned above, the higher waterproof and corrosion resistance performance was able to be exhibited.

さらに、接合部6の周囲を囲んで設けた凹部3aを表面側から押し潰しシール材5を被接合材料1,2に密着させることによって、被接合材料1,2及び接合部6とシール材5の密着性が高まり、より高い防水、耐食性能を発揮することができた。
これらの結果、接合界面におけるシール材残存による強度低下の防止と優れた耐食性を両立することができた。
Further, by crushing the concave portion 3a provided surrounding the periphery of the joint portion 6 from the surface side and bringing the seal material 5 into close contact with the material to be joined 1 and 2, the material to be joined 1, 2 and the joint portion 6 and the seal material 5 As a result, it was possible to achieve higher waterproofness and corrosion resistance.
As a result, it was possible to achieve both the prevention of strength reduction due to the remaining sealing material at the joint interface and excellent corrosion resistance.

なお、この実施例においては、図3(b)に示したように、亜鉛めっき鋼板1の接合面に、接合予定部位1aを取り囲む凹部3aを形成した例を示したが、図3(c)に示すように、亜鉛めっき鋼板1に、接合面側に突出する凸部4aを接合予定部位1aを囲むリング状に形成しても同様の効果が得られることが確認されている。   In addition, in this Example, as shown in FIG.3 (b), although the example which formed the recessed part 3a surrounding the joining plan site | part 1a in the joining surface of the galvanized steel plate 1 was shown, FIG.3 (c) As shown in FIG. 5, it has been confirmed that the same effect can be obtained even if the galvanized steel sheet 1 is formed in a ring shape surrounding the part to be joined 1a with the convex part 4a protruding to the joining surface side.

(実施例2)
図4(a)及び(b)に示すように、亜鉛めっき鋼板1の接合面側に、凹部3bを複数の接合予定部位1a(図では2個所)を囲むような矩形状に形成し、この凹部3bの内側を除く外側部分に、上記同様のシール材4を塗布した。
そして、これ以降は、上記実施例1と同様に、両材料1,2を接合予定部位1aにおいてスポット溶接したのち、凹部3bによる突出部を表面側から押し潰し、同様にシール材5を被接合材料1,2に密着させた。
(Example 2)
As shown in FIGS. 4 (a) and 4 (b), on the joining surface side of the galvanized steel sheet 1, the recesses 3b are formed in a rectangular shape surrounding a plurality of planned joining portions 1a (two places in the figure). The sealing material 4 similar to the above was applied to the outer portion excluding the inner side of the recess 3b.
Thereafter, as in the first embodiment, after both the materials 1 and 2 are spot-welded at the planned joining portion 1a, the protruding portion by the concave portion 3b is crushed from the surface side, and the sealing material 5 is similarly joined. The materials 1 and 2 were adhered.

この実施例においては、上記同様の効果が得られると共に、凹部3bを複数の接合予定部位1aを囲んで設けたことによって、シール材によって複数の接合部6を纏めて外気と遮断できるため、作業効率が向上した。   In this embodiment, the same effect as described above can be obtained, and since the recesses 3b are provided so as to surround the plurality of joints 1a, the plurality of joints 6 can be collectively blocked by the sealing material by the sealing material. Increased efficiency.

なお、上記凹部3bに換えて、図4(c)に示すように、亜鉛めっき鋼板1に、接合面側に突出する凸部4bを複数の接合予定部位1aを囲むように矩形状に形成するようになすことも可能である。   In addition, it replaces with the said recessed part 3b, and as shown in FIG.4 (c), the convex part 4b which protrudes in the joining surface side is formed in the rectangular shape so that the some joining plan site | part 1a may be enclosed in the galvanized steel plate 1. It is also possible to do so.

(実施例3)
図5(a)及び(b)に示すように、亜鉛めっき鋼板1の接合面側に、凹部3cを線状の接合予定部位1aに沿って、これを囲むような矩形状に形成し、この凹部3cの内側を除く外側部分に、上記同様のシール材4を塗布した。
そして、アルミニウム合金材2と重ねあわせ、図2に示した抵抗シーム溶接装置を用いて、両ローラ電極の間に400kgfの一定な加圧力を加え、30000Aの交流電流を通電しながら、1.8m/分の速度で、両材料1,2を接合予定部位1aにおいてシーム溶接したのち、形成された溶接線16(接合部)の周囲に突出した凹部3cの裏面側を矢印方向に押し潰しシール材5を両材料1,2に密着させた。
(Example 3)
As shown in FIGS. 5 (a) and 5 (b), on the joining surface side of the galvanized steel sheet 1, a concave portion 3c is formed in a rectangular shape surrounding the linear joining planned portion 1a. The sealing material 4 similar to the above was applied to the outer portion excluding the inner side of the recess 3c.
Then, the aluminum alloy material 2 is overlapped, and a resistance seam welding apparatus shown in FIG. 2 is used, a constant pressure of 400 kgf is applied between both roller electrodes, and an alternating current of 30000 A is applied, and 1.8 m After seam welding the two materials 1 and 2 at the planned joining site 1a at a speed of / min, the back surface side of the recessed portion 3c protruding around the formed weld line 16 (joined portion) is crushed in the direction of the arrow and the sealing material 5 was adhered to both materials 1 and 2.

このように、凹部3cを線状をなす接合予定部位1aを囲むように、当該接合予定部位1aに沿って伸びる長尺矩形状に形成することによって、シーム溶接についてもシール材残存による強度低下の防止と、異種金属接触による耐食性劣化の防止を両立することができた。
なお、上記凹部3cに換えて、図5(c)に示すように、接合面側に突出する凸部4cを線状の接合予定部位1aを囲む矩形状に形成しても同様の効果が得られることは、上記実施例1,2と全く同様である。
In this way, by forming the concave portion 3c into a long rectangular shape extending along the planned joining portion 1a so as to surround the joining planned portion 1a having a linear shape, the strength of the seam welding is reduced due to the remaining sealing material. It was possible to achieve both prevention and deterioration of corrosion resistance due to contact with different metals.
In place of the recess 3c, as shown in FIG. 5C, the same effect can be obtained even if the protrusion 4c protruding toward the bonding surface is formed in a rectangular shape surrounding the linear bonding planned site 1a. This is exactly the same as in the first and second embodiments.

(実施例4)
図6(a)及び(b)は、本発明の第4の実施例に関する説明図であって、ここでは、板厚0.8mmの亜鉛めっき鋼板から成るハット型断面部材1と、板厚1.0mmの6000系アルミニウム合金板材2とをシート状のシール材15を介してスポット溶接する例を示している。
Example 4
6 (a) and 6 (b) are explanatory views relating to a fourth embodiment of the present invention. Here, a hat-shaped cross-sectional member 1 made of a galvanized steel sheet having a thickness of 0.8 mm, and a thickness 1 An example is shown in which a 0.0 mm 6000 series aluminum alloy sheet 2 is spot-welded via a sheet-like sealing material 15.

アルミニウム合金板材2の両端部の接合予定部位には、図6(b)に示すように、接合面側に突出する円弧状の凸部2aがそれぞれ形成してあり、シート状をなすシール材15には、上記接合予定部位、すなわち凸部2aに相当する位置に貫通孔15aが予め設けてある。
次に、アルミニウム合金板材2の両端部に、シール材15を載置し、板材2の凸部2aがシール材15の貫通孔15aに嵌合するように位置合せをし、この上に亜鉛めっき鋼板部材1のフランジ部を重ねた。
As shown in FIG. 6 (b), arc-shaped convex portions 2a projecting toward the joining surface are respectively formed at the planned joining portions at both ends of the aluminum alloy sheet material 2, and a sealing material 15 having a sheet shape is formed. Is provided with a through-hole 15a in advance at the position to be joined, that is, at a position corresponding to the convex portion 2a.
Next, the sealing material 15 is placed on both ends of the aluminum alloy plate material 2 and aligned so that the convex portion 2a of the plate material 2 fits into the through hole 15a of the sealing material 15, and galvanized thereon. The flange part of the steel plate member 1 was overlapped.

そして、図1に示したような抵抗スポット溶接装置を用いて300kgfの加圧力を加えながら、20000Aの交流電流を0.24秒間通電することによって、両材料1,2を接合予定部位(凸部2a)においてそれぞれスポット溶接することによって接合した。
当該実施例においては、シール材として接合予定部位に相当する箇所に貫通孔15aを備えたシート状のものを用いることによって、シール材の塗布工程が省略でき、しかも両材料間に挟み込むだけで、一度に多数の接合部に対して耐食機能を付与することができる。また、凸部2aによって、シート状シール材15の位置決めが容易にできるようになり、高い生産性のもとに、シール材残存による強度低下の防止と優れた耐食性を両立することができた。
Then, while applying a pressure of 300 kgf using a resistance spot welding apparatus as shown in FIG. 1, an alternating current of 20000 A is energized for 0.24 seconds, whereby both materials 1 and 2 are to be joined (projection) In 2a), each was joined by spot welding.
In this embodiment, by using a sheet-like material provided with through-holes 15a at a location corresponding to the site to be joined as the sealing material, the sealing material application step can be omitted, and only sandwiched between both materials, Corrosion resistance can be imparted to many joints at once. Further, the convex portion 2a makes it easy to position the sheet-like sealing material 15, and it is possible to achieve both the prevention of strength reduction due to the remaining sealing material and excellent corrosion resistance with high productivity.

このような凸部2aの突出面をなだらかな円弧状の湾曲面とすることによって、鋼板表面にめっき層として存在する亜鉛とアルミニウムの共晶溶融物やアルミニウムの酸化皮膜、その他接合過程で生ずる種々の反応生成物などの接合界面からの排出性を向上して、より強固な接合が可能になる。
なお、ここでは、アルミニウム合金板材2の接合面に凸部2aを設けた例を示したが、鋼材1の側や、これらの両方に凸部を設けても構わない。
By making the projecting surface of the convex portion 2a a gentle arc-shaped curved surface, a zinc-aluminum eutectic melt existing as a plating layer on the steel sheet surface, an oxide film of aluminum, and various other processes generated in the joining process As a result, the discharge property of the reaction product from the bonding interface is improved, and a stronger bonding becomes possible.
In addition, although the example which provided the convex part 2a in the joining surface of the aluminum alloy board | plate material 2 was shown here, you may provide a convex part in the steel material 1 side or both of these.

(比較例)
実施例1で使用した亜鉛めっき鋼板1とアルミニウム合金板材2を用いて、接合面にシール材を塗布することなく、実施例1と同様の条件でスポット溶接した(比較例1)。
一方、上記亜鉛めっき鋼板1の接合予定部位をも含めた接合面全体にシール材5を塗布した状態で、同様の条件でスポット溶接し(比較例2)、これらを比較した。その結果を図7(a)及び(b)に示す。
(Comparative example)
Using the galvanized steel sheet 1 and the aluminum alloy sheet 2 used in Example 1, spot welding was performed under the same conditions as in Example 1 without applying a sealing material to the joint surfaces (Comparative Example 1).
On the other hand, spot welding was performed under the same conditions in a state where the sealing material 5 was applied to the entire joint surface including the planned joining portion of the galvanized steel sheet 1 (Comparative Example 2), and these were compared. The results are shown in FIGS. 7 (a) and (b).

シール材を塗布することなく接合した場合には、図7(a)に示すように、接合部に拡散反応層Dが生成されると共に、その周囲にめっき層の亜鉛とアルミニウムの共晶溶融物Eの排出が認められ、良好な接合状態が確認されたが、両材料のイオン化傾向の相違によって両材料間に電位差が生じ、腐食電流が流れることによって腐食が生じる。
これに対し、接合面全体にシール材5を塗布した状態で接合した場合には、水等の浸入を防ぎ、耐食性能は得られるものの、図7(b)に示すように、拡散反応層が部分的に形成されているに過ぎなく、接合界面にシール材5が残存しているため、接合強度が低下してしまい、これらの場合は共に、接合界面におけるシール材残存による強度低下の防止と、電食による耐食性劣化の防止の両立を実現することができない。表1に、これら比較例と、本発明の上記実施例1の性能を比較して示す。
When bonded without applying a sealing material, as shown in FIG. 7A, a diffusion reaction layer D is formed at the bonded portion, and a zinc and aluminum eutectic melt around the plating layer is formed around the diffusion reaction layer D. E was observed, and a good bonding state was confirmed. However, a difference in ionization tendency between the two materials caused a potential difference between the two materials, and a corrosion current flowed to cause corrosion.
On the other hand, when bonded in a state where the sealing material 5 is applied to the entire bonding surface, although the penetration of water and the like is prevented and corrosion resistance is obtained, as shown in FIG. Since the sealing material 5 is only partially formed and remains at the bonding interface, the bonding strength is reduced. In both cases, the strength is prevented from being reduced due to the remaining sealing material at the bonding interface. In addition, it is impossible to realize both prevention of deterioration of corrosion resistance due to electric corrosion. Table 1 shows a comparison between these comparative examples and the performance of Example 1 of the present invention.

Figure 2008000754
Figure 2008000754

本発明の実施例に用いた抵抗スポット溶接装置の構成を示す概略ずである。It is the outline which shows the structure of the resistance spot welding apparatus used for the Example of this invention. 本発明の実施例に用いた抵抗シーム溶接装置の構成を示す概略ずである。It is the outline which shows the structure of the resistance seam welding apparatus used for the Example of this invention. 本発明の実施例1により得られた接合部の平面図(a)、断面図(b)及び凹部に替えて凸部を形成した場合の断面図(c)である。It is sectional drawing (c) at the time of forming a convex part instead of the top view (a), sectional drawing (b), and recessed part of the junction part obtained by Example 1 of this invention. 本発明の実施例2により得られた接合部の平面図(a)、断面図(b)及び凹部に替えて凸部を形成した場合の断面図(c)である。It is sectional drawing (c) at the time of replacing with a top view (a), sectional drawing (b), and a recessed part of the junction part obtained by Example 2 of this invention. 本発明の実施例3により得られた接合部の平面図(a)、断面図(b)及び凹部に替えて凸部を形成した場合の断面図(c)である。It is sectional drawing (c) at the time of replacing with the top view (a) of sectional part obtained by Example 3 of this invention, sectional drawing (b), and a recessed part, and forming a convex part. 本発明の第4の実施例における接合要領を示す斜視図(a)及び断面図(b)である。It is the perspective view (a) and sectional drawing (b) which show the junction point in the 4th Example of this invention. 比較例としてシール材を用いることなく溶接して得られる接合構造(a)と、シール材を接合面の全体に塗布して溶接した接合構造(b)を示す断面図である。It is sectional drawing which shows the joining structure (a) obtained by welding without using a sealing material as a comparative example, and the joining structure (b) which apply | coated and welded the sealing material to the whole joining surface.

符号の説明Explanation of symbols

1 亜鉛めっき鋼板
1a 接合予定部位
2 アルミニウム合金材
2a 凸部
3a、3b、3c 凹部
4a、4b、4c 凸部
5、15 シール材
6、16 接合部
15a 貫通孔
DESCRIPTION OF SYMBOLS 1 Galvanized steel plate 1a Joining part 2 Aluminum alloy material 2a Convex part 3a, 3b, 3c Concave part 4a, 4b, 4c Convex part 5,15 Seal material 6,16 Joint part 15a Through-hole

Claims (11)

異種金属から成る材料を重ね接合するに際して、重ね合わせた両材料の間に、接合予定部位を囲んでシール材を配置した状態で溶接することを特徴とする異種金属の接合方法。   A method for joining dissimilar metals, characterized in that when a material composed of dissimilar metals is lap-joined, welding is performed in a state where a sealing material is disposed between the overlapped materials so as to surround a site to be joined. 上記両材料の少なくとも一方の接合面における接合予定部位に凸部を形成することを特徴とする請求項1に記載の異種金属の接合方法。   The method for joining dissimilar metals according to claim 1, wherein a projecting portion is formed at a planned joining site on at least one joining surface of the both materials. 上記凸部が湾曲面を有していることを特徴とする請求項2に記載の異種金属の接合方法。   The method for joining dissimilar metals according to claim 2, wherein the convex portion has a curved surface. 上記両材料の少なくとも一方の接合面に、上記接合予定部位を囲繞する凹部又は凸部を形成することを特徴とする請求項1に記載の異種金属の接合方法。   2. The method for joining dissimilar metals according to claim 1, wherein a concave portion or a convex portion surrounding the portion to be joined is formed on at least one joint surface of the two materials. 重ね合わせた両材料の間に、接合部に相当する部位に貫通孔を備えたシート状シール材を介在させることを特徴とする請求項1〜3のいずれか1つの項に記載の異種金属の接合方法。   The dissimilar metal according to any one of claims 1 to 3, wherein a sheet-like sealing material having a through-hole is interposed between the overlapped materials at a portion corresponding to the joint portion. Joining method. 請求項1〜5のいずれか1つの項に記載の方法によって得られる接合構造であって、重ね合わせた両材料間に、接合部を囲んでシール材が介在していることを特徴とする異種金属の接合構造。   It is a joining structure obtained by the method according to any one of claims 1 to 5, wherein a sealing material is interposed between the superposed materials so as to surround the joining portion. Metal junction structure. 上記接合部が点状をなし、該点状接合部を囲んで凹部又は凸部が形成され、該凹部又は凸部の周囲にシール材が介在していることを特徴とする請求項6に記載の異種金属の接合構造。   7. The joint according to claim 6, wherein the joint has a dot shape, a recess or a projection is formed surrounding the spot joint, and a sealing material is interposed around the recess or the projection. Bonding structure of dissimilar metals. 上記接合部が点状をなし、複数の点状接合部を囲んで凹部又は凸部が形成され、該凹部又は凸部の周囲にシール材が介在していることを特徴とする請求項6に記載の異種金属の接合構造。   7. The joint according to claim 6, wherein the joint is formed in a dot shape, and a plurality of dot joints are formed to form a recess or a projection, and a sealing material is interposed around the recess or the projection. The junction structure of the dissimilar metals described. 上記接合部が線状をなし、該線状接合部を囲んで凹部又は凸部が形成され、該凹部又は凸部の周囲にシール材が介在していることを特徴とする請求項6に記載の異種金属の接合構造。   The said joining part comprises linear form, a recessed part or a convex part is formed surrounding this linear joined part, and the sealing material is interposing the said recessed part or convex part, It is characterized by the above-mentioned. Bonding structure of dissimilar metals. 上記凹部又は凸部が押し潰され、周囲のシール材が両材料に密着していることを特徴とする請求項7〜9のいずれか1つの項に記載の異種金属の接合構造。   The joint structure of dissimilar metals according to any one of claims 7 to 9, wherein the concave portion or the convex portion is crushed and a surrounding sealing material is in close contact with both materials. 接合部の周囲に凹部を備え、該凹部の接合部側の縁が接合面に対して略垂直に立ち上がっていることを特徴とする請求項7〜10のいずれか1つの項に記載の異種金属の接合構造。   The dissimilar metal according to any one of claims 7 to 10, wherein a concave portion is provided around the joint portion, and an edge on the joint portion side of the concave portion rises substantially perpendicular to the joint surface. Bonding structure.
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EP2314408A1 (en) * 2009-10-23 2011-04-27 Mazda Motor Corporation Method of welding and adhesive bonding of dissimilar metal plates with pre-heating, cooling and welding steps; Dissimilar metal joined body
JP2012071631A (en) * 2010-09-27 2012-04-12 Unipres Corp Panel-forming-member structure constituting frame member of automobile
JP2013130238A (en) * 2011-12-21 2013-07-04 Nippon Steel & Sumitomo Metal Corp Dissimilar metal bonded joint, and method of manufacturing the same
WO2013108354A1 (en) * 2012-01-16 2013-07-25 トヨタ自動車株式会社 Panel joining structure
JP2014094390A (en) * 2012-11-08 2014-05-22 Konica Minolta Inc Laser welding method for plated steel sheet
US9505084B2 (en) 2011-09-22 2016-11-29 Nissan Motor Co., Ltd. Joining method and joining component
US10583629B2 (en) * 2015-02-06 2020-03-10 Kobe Steel, Ltd. Joining structure
JP2020175434A (en) * 2019-04-22 2020-10-29 株式会社神戸製鋼所 Method of manufacturing metal structural member and metal structural member

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Publication number Priority date Publication date Assignee Title
JP2009190051A (en) * 2008-02-13 2009-08-27 Mazda Motor Corp Joining method of different kind of metal sheet
US8502105B2 (en) 2009-10-23 2013-08-06 Mazda Motor Corporation Joining method of dissimilar metal plates and dissimilar metal joined body
EP2314408A1 (en) * 2009-10-23 2011-04-27 Mazda Motor Corporation Method of welding and adhesive bonding of dissimilar metal plates with pre-heating, cooling and welding steps; Dissimilar metal joined body
JP2012071631A (en) * 2010-09-27 2012-04-12 Unipres Corp Panel-forming-member structure constituting frame member of automobile
US9505084B2 (en) 2011-09-22 2016-11-29 Nissan Motor Co., Ltd. Joining method and joining component
JP2013130238A (en) * 2011-12-21 2013-07-04 Nippon Steel & Sumitomo Metal Corp Dissimilar metal bonded joint, and method of manufacturing the same
JP5382233B1 (en) * 2012-01-16 2014-01-08 トヨタ自動車株式会社 Panel joint structure
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WO2013108354A1 (en) * 2012-01-16 2013-07-25 トヨタ自動車株式会社 Panel joining structure
JP2014094390A (en) * 2012-11-08 2014-05-22 Konica Minolta Inc Laser welding method for plated steel sheet
US10583629B2 (en) * 2015-02-06 2020-03-10 Kobe Steel, Ltd. Joining structure
JP2020175434A (en) * 2019-04-22 2020-10-29 株式会社神戸製鋼所 Method of manufacturing metal structural member and metal structural member
JP7227063B2 (en) 2019-04-22 2023-02-21 株式会社神戸製鋼所 metal structural member

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