JP2754898B2 - Spot welding of Al-Fe based dissimilar metals - Google Patents
Spot welding of Al-Fe based dissimilar metalsInfo
- Publication number
- JP2754898B2 JP2754898B2 JP2268035A JP26803590A JP2754898B2 JP 2754898 B2 JP2754898 B2 JP 2754898B2 JP 2268035 A JP2268035 A JP 2268035A JP 26803590 A JP26803590 A JP 26803590A JP 2754898 B2 JP2754898 B2 JP 2754898B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- plate
- spot welding
- spot
- alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Resistance Welding (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、AlとFeを重ね合わせてスポット溶接するAl
−Fe系異種金属のスポット溶接法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an Al that is spot-welded by overlapping Al and Fe.
The present invention relates to a spot welding method for Fe-based dissimilar metals.
近年、自動車等の軽量化指向にともない、AlとFeのス
ポット溶接技術の確立が必要となっている。In recent years, with the trend toward weight reduction of automobiles and the like, it has become necessary to establish spot welding technology for Al and Fe.
ところで、AlとFeは熱を加えると容易に合金を形成す
る性質を有しているため、AlとFeをスポット溶接等で接
合する場合、溶接熱によって溶着面に必ずAlとFeの合金
化合物層ができてしまう。この金属間化合物は硬くて脆
く、ほとんど塑性変形能を有しているため、繰り返し応
力や震動が負荷されると母材強度よりもはるかに弱い力
で破壊されてしまう欠点を有している。By the way, since Al and Fe have the property of easily forming an alloy when heat is applied, when Al and Fe are joined by spot welding or the like, an alloy compound layer of Al and Fe must be formed on the welding surface by welding heat. Can be done. Since this intermetallic compound is hard and brittle and has almost plastic deformability, it has a drawback that when it is repeatedly subjected to stress or vibration, it is broken by a force much smaller than the strength of the base material.
従って、AlとFe板を溶接する場合、通常はスポット溶
接やレーザ溶接のように接合面に熱が関与する方法を避
け、AlとFe板を重ね合わせ、溶接しようとする箇所にリ
ベット用貫通孔を開け、リベット止め等していた。Therefore, when welding Al and Fe plates, usually avoid heat-related methods such as spot welding and laser welding on the joint surface, overlap the Al and Fe plates, and place rivet through holes at the locations to be welded. Was opened and riveted.
しかし、リベット止め法は、スポット溶接法に比べて
非常に生産性が低いため、効率の良い接合法の開発が強
く望まれていた。However, since the riveting method has much lower productivity than the spot welding method, it has been strongly desired to develop an efficient joining method.
そこで本発明の目的は、前記した従来技術の欠点を解
消し、生産速度を大幅に向上させることができるスポッ
ト溶接法を提供することにある。Therefore, an object of the present invention is to provide a spot welding method that can solve the above-mentioned disadvantages of the conventional technology and can greatly improve the production speed.
本発明は、AlとFeを高い生産速度によって接合するた
め、その溶接面にMg又はMg合金を介在させて三層構造と
してスポット溶接するものである。Mg又はMg合金は板状
部材であってもよく、あるいはAl又はFeにクラッド法あ
るいはめっき法によって形成された被覆層であってもよ
い。In the present invention, in order to join Al and Fe at a high production rate, spot welding is performed as a three-layer structure with Mg or an Mg alloy interposed on the weld surface. The Mg or Mg alloy may be a plate-like member or a coating layer formed on Al or Fe by a cladding method or a plating method.
本発明においては、AlとFeを重ね合わせてスポット溶
接する際，その溶接面にMgまたはMg合金を介在させ、三
層構造としてスポット溶接することにより、AlとFeが溶
接の初期には直接接触していないので、両者が溶接時の
熱によって形成する有害な金属間化合物層の発生が抑止
される。このとき、接合部にあったMg又はMg層は、溶接
時の熱によって溶融飛散し、最終的にはAlとFeとが直接
接合することとなり、接合面の引張強度も十分となる。In the present invention, when Al and Fe are overlapped and spot-welded, Mg or Mg alloy is interposed on the weld surface and spot-welded as a three-layer structure, so that Al and Fe are in direct contact at the beginning of welding. As a result, the generation of a harmful intermetallic compound layer formed by the heat generated during welding is suppressed. At this time, the Mg or Mg layer in the joint portion is melted and scattered by the heat at the time of welding, and finally Al and Fe are directly joined, and the joining surface has sufficient tensile strength.
以下、本発明の実施例について図を参照しながら説明
する。Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は、本発明のスポット溶接法の一例を示す説明
図である。図において、Al板１（Al100P、1.0t×20w−
ｌ）とFe板２（SPCC.1.0t×20w−ｌ）とは間にMg板３
（MP1、0.5t×20w−20L）を挟んで重ね合わせた三層状
板を構成し、この三層状板の溶接スポット６を、スポッ
ト溶接機本体４に接続した溶接用電極5a,5bによりスポ
ット溶接するものである。溶接条件として、電極先端径
9.5mmを用い、溶接電圧AC200v×短絡電流7,500A、通電
時間約1secにおいて加圧力80Kgで溶接を行った。FIG. 1 is an explanatory view showing an example of the spot welding method of the present invention. In the figure, Al plate 1 (Al100P, 1.0 t × 20 w −
l) and Fe plate 2 (SPCC.1.0 t × 20 w- l)
(MP1, 0.5 t × 20 w− 20 L ) are sandwiched to form a three-layer plate, and the welding spot 6 of the three-layer plate is connected to the welding electrodes 5 a and 5 b connected to the spot welding machine body 4. It is spot welding. Electrode tip diameter as welding conditions
Using 9.5 mm, welding was performed at a welding voltage of 200 V × short-circuit current of 7,500 A and a pressing force of 80 kg at a conduction time of about 1 sec.
第２図は、前記溶接条件でスポット溶接した場合の接
合部の断面図である。接合部にあったMg板は溶融飛散し
ており、Al板とFe板とが直接接合していることが分か
る。従って、有害な金属間化合物層が見られない。FIG. 2 is a cross-sectional view of the joint when spot welding is performed under the welding conditions. It can be seen that the Mg plate at the joint was melted and scattered, and the Al plate and the Fe plate were directly joined. Therefore, no harmful intermetallic compound layer is observed.
第３図は、第２図と同一条件でAl板とFe板を直接重ね
合わせ、上記と同一の溶接条件でスポット溶接した場合
の断面図である。この場合、接合面には明らかに金属化
合物層が生成しており、Al板とFe板の間にMg板等を挿入
してスポット溶接する方法は、金属間化合物層の生成防
止に有効な手段であることが確認できた。FIG. 3 is a cross-sectional view when an Al plate and an Fe plate are directly overlapped under the same conditions as in FIG. 2 and spot-welded under the same welding conditions as above. In this case, a metal compound layer is clearly formed on the joint surface, and a method of spot welding by inserting an Mg plate or the like between the Al plate and the Fe plate is an effective means for preventing generation of the intermetallic compound layer. That was confirmed.
次に、本発明の方法によりスポット溶接した試験片
（No.1,2）の引張試験を行った結果、１スポット当たり
64.8Kgf（No.1）及び75.2Kgf（No.2）と、各試験片はい
ずれも60Kgf以上の引張強度を有していることが分かっ
た。しかも、破断状況は第４図（ａ）及び（ｂ）に示す
ように、破断がいずれも母材内で起こっており、接合は
完全であったことも確認できた。Next, a tensile test was performed on the test pieces (Nos. 1 and 2) spot-welded by the method of the present invention.
64.8 Kgf (No. 1) and 75.2 Kgf (No. 2), each of which had a tensile strength of 60 kgf or more. Moreover, as shown in FIGS. 4 (a) and 4 (b), it was also confirmed that the fracture occurred in the base material and that the joining was complete.
一方、Mg板を挟まないでAl板とFe板とを直接重ね合わ
せてスポット溶接した試験片を上記と同様に試験したと
ころ、引張強度は、１スポット当たり50〜60Kgfと前者
に近い値を示すが、破断は金属間化合物層内で起こって
いた。従って、この試験片に実用状態における繰り返し
応力や震動を負荷した場合の引張強度は、今回の試験結
果で得られた引張強度の値50〜60Kgfをはるかに下回る
ことは必至である。On the other hand, when the Al plate and the Fe plate were directly overlapped and spot-welded without interposing the Mg plate and tested in the same manner as above, the tensile strength showed a value close to the former, which was 50 to 60 kgf per spot. However, the fracture occurred in the intermetallic compound layer. Therefore, it is inevitable that the tensile strength when the test piece is subjected to repeated stress or vibration in a practical state is much lower than the tensile strength value of 50 to 60 kgf obtained in the present test results.
なお、Al板の材質は、上記実施例のAl100Pに限らず、
その他のAl合金板でもよい。また、Fe板についても、SP
CC以外のFe合金板で、しかもZnやSnめっきした鋼材であ
ってもよい。さらに、Mg板についても、MP1以外のMg合
金板を用いることができ、これらを種々組み合わせて用
いても上記実施例と同様の効果が得られる。The material of the Al plate is not limited to Al100P of the above embodiment,
Other Al alloy plates may be used. Also, for Fe plates, SP
It may be a Fe alloy plate other than CC and a steel material plated with Zn or Sn. Further, as for the Mg plate, Mg alloy plates other than MP1 can be used, and the same effects as in the above embodiment can be obtained by using these in various combinations.
さらに、AlまたはFe母材のいずれか一方の接合面に、
Mg又はMg合金をクラッド法やめっき法で被覆したもので
あっても上記と同じ効果を得ることができる。Furthermore, on the joining surface of either Al or Fe base material,
The same effect as described above can be obtained even when the alloy is coated with Mg or Mg alloy by a cladding method or a plating method.
以上説明した通り、本発明により、AlとFeのスポット
溶接が容易に行え、しかも確実に接合することができ
る。さらに、金属間化合物層の生成を完全に防止できる
上、リベット止め法に比べて、接合効率を大幅に向上さ
せることができる。As described above, according to the present invention, spot welding of Al and Fe can be easily performed, and moreover, reliable joining can be achieved. Further, the formation of the intermetallic compound layer can be completely prevented, and the joining efficiency can be greatly improved as compared with the riveting method.
第１図は本発明に係るAl−Fe系異種金属のスポット溶接
の一実施例を示す説明図、第２図は本発明の溶接法によ
りAl板とFe板の間にMg板を挿入してスポット溶接した場
合の接合部の断面図、第３図は従来の溶接法によりAl板
とFe板とをスポット溶接した場合の接合部の断面図、第
４図（ａ）及び（ｂ）は本発明の溶接法で溶接して得た
試験片の破断状況を示す断面図である。 符号の説明 １……Al板 ２……Fe板 ３……Mg板 ４……スポット溶接機本体 5a,5b……溶接用電極 ６……溶接スポットFIG. 1 is an explanatory view showing one embodiment of spot welding of Al-Fe based dissimilar metals according to the present invention, and FIG. FIG. 3 is a cross-sectional view of the joint when the Al plate and the Fe plate are spot-welded by a conventional welding method, and FIGS. 4 (a) and 4 (b) are sectional views of the present invention. It is sectional drawing which shows the fracture | rupture situation of the test piece obtained by welding by the welding method. DESCRIPTION OF SYMBOLS 1 ... Al plate 2 ... Fe plate 3 ... Mg plate 4 ... Spot welding machine body 5a, 5b ... Welding electrode 6 ... Welding spot
Claims (2)
接法において、AlとFeの間にMg又はMg合金を介在させて
三層構造とし、その三層構造にスポット溶接を施すこと
を特徴とするAl−Fe系異種金属のスポット溶接法。In a welding method for overlapping and spot welding Al and Fe, Mg or Mg alloy is interposed between Al and Fe to form a three-layer structure, and the three-layer structure is subjected to spot welding. Spot welding method for Al-Fe based dissimilar metals.
前記Al又はFeの一方あるいは両方に施された被覆材であ
る請求項第１項記載のAl−Fe系異種金属のスポット溶接
法。2. The spot welding method according to claim 1, wherein said Mg or Mg alloy is a plate-like member or a coating material applied to one or both of Al and Fe. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2268035A JP2754898B2 (en) | 1990-10-05 | 1990-10-05 | Spot welding of Al-Fe based dissimilar metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2268035A JP2754898B2 (en) | 1990-10-05 | 1990-10-05 | Spot welding of Al-Fe based dissimilar metals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04143083A JPH04143083A (en) | 1992-05-18 |
| JP2754898B2 true JP2754898B2 (en) | 1998-05-20 |
Family
ID=17452972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2268035A Expired - Lifetime JP2754898B2 (en) | 1990-10-05 | 1990-10-05 | Spot welding of Al-Fe based dissimilar metals |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2754898B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6994920B2 (en) * | 2003-10-31 | 2006-02-07 | General Electric Company | Fusion welding method and welded article |
| KR100790638B1 (en) | 2004-04-21 | 2008-01-02 | 가부시키가이샤 고베 세이코쇼 | Joined body of dissimilar materials comprising steel material and aluminum material, and joining method therefor |
| JP4555160B2 (en) | 2005-06-01 | 2010-09-29 | 株式会社神戸製鋼所 | Steel plate for dissimilar welding with aluminum material and dissimilar material joint |
| EP2340910B1 (en) | 2006-02-23 | 2015-04-08 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Joint product between steel product and aluminum material and spot welding method for the joint product |
| JP2009072812A (en) * | 2007-09-20 | 2009-04-09 | Honda Motor Co Ltd | Joining method for ferrous material and aluminum material, and iron-aluminum joined member |
| JP5495093B2 (en) * | 2008-01-17 | 2014-05-21 | 日産自動車株式会社 | Joining method and structure of dissimilar metals |
| JP5326862B2 (en) | 2008-09-08 | 2013-10-30 | 日産自動車株式会社 | Dissimilar metal joining method of magnesium alloy and steel |
-
1990
- 1990-10-05 JP JP2268035A patent/JP2754898B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04143083A (en) | 1992-05-18 |
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