JPH0813424B2 - Spot welding electrode - Google Patents

Spot welding electrode

Info

Publication number
JPH0813424B2
JPH0813424B2 JP3151006A JP15100691A JPH0813424B2 JP H0813424 B2 JPH0813424 B2 JP H0813424B2 JP 3151006 A JP3151006 A JP 3151006A JP 15100691 A JP15100691 A JP 15100691A JP H0813424 B2 JPH0813424 B2 JP H0813424B2
Authority
JP
Japan
Prior art keywords
electrode
spot welding
tip
coating layer
copper
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
Application number
JP3151006A
Other languages
Japanese (ja)
Other versions
JPH04356375A (en
Inventor
精 野世渓
圭三 難波
啓路 佐野
誠 米光
正樹 熊谷
雅功 常川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Light Metal Industries Ltd
Original Assignee
Sumitomo Light Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Light Metal Industries Ltd filed Critical Sumitomo Light Metal Industries Ltd
Priority to JP3151006A priority Critical patent/JPH0813424B2/en
Priority claimed from US07/890,017 external-priority patent/US5334814A/en
Publication of JPH04356375A publication Critical patent/JPH04356375A/en
Publication of JPH0813424B2 publication Critical patent/JPH0813424B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、スポット溶接用電極、
とくにアルミニウムおよびアルミニウム合金(以下、ア
ルミニウムという)のスポット溶接用電極に関する。
FIELD OF THE INVENTION The present invention relates to an electrode for spot welding,
In particular, it relates to an electrode for spot welding of aluminum and an aluminum alloy (hereinafter referred to as aluminum).

【0002】[0002]

【従来の技術】スポット溶接用電極としては高導電性、
高熱伝導性および優れた高温強度が要求され、硬銅やク
ロム銅、ジルコニウム銅、ジルコニウムクロム銅などの
析出硬化型銅合金の電極が広く使用されている。
2. Description of the Related Art Electrodes for spot welding have high conductivity,
High thermal conductivity and excellent high-temperature strength are required, and electrodes of precipitation hardening copper alloys such as hard copper, chromium copper, zirconium copper, and zirconium chromium copper are widely used.

【0003】アルミニウムおよびアルミニウム合金(以
下、アルミニウム)のスポット溶接に対しても一般にこ
れらの銅または銅合金製電極が用いられているが、最近
のように高度に自動化され、連続的かつ高速のスポット
溶接作業に適用された場合、短時間で電極先端部が損耗
するとともに、スポット溶接部の強度も低下してしまう
という問題点がある。
These copper or copper alloy electrodes are also generally used for spot welding of aluminum and aluminum alloys (hereinafter referred to as aluminum), but recently, highly automated, continuous and high-speed spots are used. When it is applied to welding work, there is a problem that the tip portion of the electrode is worn in a short time and the strength of the spot welded portion is reduced.

【0004】この問題を解決するために、銅合金電極の
被溶接部材と接触する部分にW等の高融点、高硬度の薄
膜を形成した電極が提案されている(特開昭63−260684
号公報) が、この電極は高価であり、加工性も十分でな
いため、実用上問題を残している。
In order to solve this problem, there has been proposed an electrode in which a thin film having a high melting point and high hardness such as W is formed on a portion of a copper alloy electrode which comes into contact with a member to be welded (Japanese Patent Laid-Open No. 63-260684).
However, since this electrode is expensive and its workability is not sufficient, there is a problem in practical use.

【0005】電極チップの先端表面にCo基合金やCr
基合金を被覆した電極(特開昭63−30185 号公報) 、あ
るいはAlを被覆した電極(特公昭60−48275 号公報)
も開発されているが、CoやCrは価格的に問題があ
り、電極の耐久性の点でもやや不安が残る。Alを被覆
した電極の場合、電極寿命を確実に向上させ高強度の溶
接部を得るためには、被溶接部材であるアルミニウムの
表面から酸化皮膜を除くための十分な前処理を必要と
し、ときにはワイヤーブラシで機械的に処理するなどし
てアルミニウム表面の酸化皮膜を完全に除去しなければ
ならないため前処理に手間がかかる。
On the tip surface of the electrode tip, Co-based alloy or Cr
Electrodes coated with base alloy (JP-A-63-30185) or electrodes coated with Al (JP-B-60-48275)
However, Co and Cr have problems in terms of price, and there is some concern about the durability of the electrode. In the case of an electrode coated with Al, in order to reliably improve the electrode life and obtain a high-strength welded portion, sufficient pretreatment for removing an oxide film from the surface of aluminum, which is the member to be welded, is required, and sometimes Since the oxide film on the aluminum surface must be completely removed by mechanically treating it with a wire brush, pretreatment is troublesome.

【0006】[0006]

【発明が解決しようとする課題】本発明は、上記従来の
問題点を解消するためになされたもので、その目的は、
アルミニウムを被溶接材として連続してスポット溶接を
行った場合、電極損耗が少なく、溶接部の強度の低下も
小さく、かつ被溶接部材のアルミニウムの前処理にも比
較的手間のかからないスポット溶接用電極を提供するこ
とにある。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to:
When spot welding is performed continuously using aluminum as the material to be welded , the electrode wear is small, the strength of the weld is not significantly reduced, and the pretreatment of the aluminum of the welded member is relatively labor-free. To provide.

【0007】[0007]

【課題を解決するための手段】上記の目的を達成するた
めの本発明によるスポット溶接用電極は、スポット溶接
用銅または銅合金電極の被溶接部材に接触する部分にS
nの被覆層を設けたことを構成上の特徴とする。
The electrode for spot welding according to the present invention for achieving the above-mentioned object is provided with S in the portion of the spot welding copper or copper alloy electrode which comes into contact with the member to be welded.
A structural feature is that an n coating layer is provided.

【0008】硬銅、クロム銅、ジルコニウム銅、ジルコ
ニウムクロム銅等からなる公知のスポット溶接用銅また
は銅合金材料を電極チップ形状に加工後、チップ先端部
にSnを被覆する。被覆方法としては、電気めっき、無
電解めっき、置換めっき、溶融めっき等めっきによる方
法、Snをはんだ付けする方法が用いられる。なお、S
n被覆中に少量のAg、B、Bi、Co、Cr、Fe、
In、Mo、Ni、P、Sb、Te、Ti、Pb、Z
r、Wの1種以上が含まれていても性能上変りはない。
[0008] A known spot welding copper or copper alloy material such as hard copper, chrome copper, zirconium copper, zirconium chrome copper or the like is processed into an electrode tip shape, and then the tip end portion is coated with Sn. As a coating method, electroplating, electroless plating, displacement plating, hot dipping, or other plating method, or a Sn soldering method is used. In addition, S
n, a small amount of Ag, B, Bi, Co, Cr, Fe,
In, Mo, Ni, P, Sb, Te, Ti, Pb, Z
Even if at least one of r and W is contained, there is no change in performance.

【0009】Sn被覆層の厚さは、0.03〜400 μm の範
囲に設定することが望ましい。0.03μm 未満ではSn被
覆による電極先端部の摩擦減少の効果が小さく、400 μ
m を越えるとスポット溶接中に被覆層が変形し、電極チ
ップ先端部の形状が不適正となり易い。
The thickness of the Sn coating layer is preferably set in the range of 0.03 to 400 μm. If it is less than 0.03 μm, the effect of reducing the friction of the electrode tip by Sn coating is small,
If it exceeds m, the coating layer is deformed during spot welding, and the shape of the tip of the electrode tip tends to be incorrect.

【0010】Sn被覆後、適当な熱処理を施してSnを
電極内に拡散させ、Cu−Sn合金の金属間化合物ε相
(Cu3 Sn)を形成させることにより一層耐久性の優
れた電極を得ることができる。好ましい熱処理条件は加
熱温度200 ℃以上、加熱時間10分以上である。
After the Sn coating, an appropriate heat treatment is performed to diffuse Sn into the electrode and form an intermetallic compound ε phase (Cu 3 Sn) of Cu—Sn alloy to obtain an electrode having more excellent durability. be able to. Preferred heat treatment conditions are a heating temperature of 200 ° C. or higher and a heating time of 10 minutes or longer.

【0011】[0011]

【作用】本発明によるスポット溶接用電極は上記の構成
を備え、電極チップの先端に形成されたSnの被覆層
が、溶接中において電極チップの先端に被溶接部材のア
ルミニウムがピックアップされるのを防止して電極の損
耗を少なくする機能を有するから、電極寿命の長いもの
となる。
The spot welding electrode according to the present invention has the above-mentioned structure, and the Sn coating layer formed on the tip of the electrode tip makes the electrode of the member to be welded on the tip of the electrode tip during welding.
Since it has a function of preventing the aluminum from being picked up and reducing the wear of the electrode, the life of the electrode becomes long.

【0012】[0012]

【実施例】以下、本発明の実施例を比較例と対比して説
明する。 実施例1 Cu−1wt%Cr合金材料から外径16mm、先端R100mm
のスポット溶接用電極チップを成形し、電極チップ先端
部に置換Snめっきにより、0.06μm および3μm 厚さ
のSn被覆層を設けた。380 μm のSn被覆層の形成は
溶融めっきによりおこなった。置換めっき方法:材料を
脱脂、水洗後、硫酸と硝酸からなる酸溶液中でエッチン
グ処理し、水洗した後、奥野製薬(株)製“サブスター
SN”−P2、L2の浴中で60℃でめっき処理した。溶
融めっき方法:材料を脱脂後、溶融Sn浴中に浸漬し
た。
Hereinafter, examples of the present invention will be described in comparison with comparative examples. Example 1 From Cu-1 wt% Cr alloy material, outer diameter 16 mm, tip R 100 mm
The electrode tip for spot welding was molded, and the Sn coating layer of 0.06 μm and 3 μm thickness was provided on the tip of the electrode tip by displacement Sn plating. The 380 μm Sn coating layer was formed by hot dip plating. Displacement plating method: The material is degreased, washed with water, etched in an acid solution consisting of sulfuric acid and nitric acid, washed with water, and then in a bath of "Substar SN" -P2, L2 manufactured by Okuno Seiyaku Co. at 60 ° C. It was plated. Hot dipping method: After degreasing the material, it was immersed in a hot Sn bath.

【0013】実施例2 実施例1と同様の方法で作製した厚さ0.05μm 、2μm
および370 μm のSn被覆層付電極チップを大気中で20
0 ℃に5h加熱し、金属Snの1部を電極内に拡散させ
た。熱処理後チップ先端部断面を顕微鏡で観察したとこ
ろ、組織の1部にCu−Sn合金の金属間化合物ε相が
形成しているのが認められた。
Example 2 Thickness of 0.05 μm, 2 μm manufactured by the same method as in Example 1
And 370 μm Sn coating layer electrode tip in air
It was heated to 0 ° C. for 5 hours to diffuse a part of metal Sn into the electrode. After the heat treatment, the tip cross section of the tip was observed with a microscope, and it was confirmed that an intermetallic compound ε phase of a Cu—Sn alloy was formed in a part of the structure.

【0014】実施例3 Cu−1wt%Cr合金材料から外径16mm、先端R100mm
のスポット溶接用電極チップを成形し、電極チップ先端
部にはんだ付けにより0.06μm 、3μm および380 μm
厚さのSnの被覆層を設けた。はんだ付けによるSnの
被覆は、フラックスを用いて電極チップ先端部にのせた
Snはんだをトーチによって加熱して溶融させ、肉盛り
する方法によりおこなった。
Example 3 From Cu-1 wt% Cr alloy material, outer diameter 16 mm, tip R100 mm
0.06μm, 3μm and 380μm by molding the electrode tip for spot welding and soldering to the tip of the electrode tip.
A thick Sn coating layer was provided. The Sn coating by soldering was carried out by a method of heating the Sn solder placed on the tip of the electrode chip using a flux with a torch to melt and then overlaying it.

【0015】実施例4 実施例3と同様の方法で作製した厚さ0.05μm 、2μm
および370 μm のSn被覆層付電極チップを大気中で20
0 ℃に5h加熱し、金属Snの1部を電極内に拡散させ
た。熱処理後チップ先端部断面を顕微鏡で観察したとこ
ろ、組織の1部にCu−Sn合金の金属間化合物ε相が
形成しているのが認められた。
Example 4 Thickness of 0.05 μm, 2 μm manufactured by the same method as in Example 3
And 370 μm Sn coating layer electrode tip in air
It was heated to 0 ° C. for 5 hours to diffuse a part of metal Sn into the electrode. After the heat treatment, the tip cross section of the tip was observed with a microscope, and it was confirmed that an intermetallic compound ε phase of a Cu—Sn alloy was formed in a part of the structure.

【0016】比較例1〜2 Cu−1wt%Cr合金材料から外径16mm、先端R100mm
のスポット溶接用電極チップを成形し、電極チップの先
端部に実施例1および実施例3と同様の置換めっき、溶
融めっきおよびはんだ付けにより厚さ0.02μm および43
0 μm のSn被覆層を設けた。
Comparative Examples 1-2: Cu-1 wt% Cr alloy material, outer diameter 16 mm, tip R100 mm
Of the spot welding electrode tip, and the tip of the electrode tip was subjected to displacement plating, hot dipping and soldering in the same manner as in Example 1 and Example 3 to a thickness of 0.02 μm and 43.
A 0 μm Sn coating was applied.

【0017】比較例3 比較例2と同様のはんだ付けにより作製したSnの被覆
層付電極チップを大気中で200 ℃に5h加熱し、金属S
nの1部を電極内に拡散させた。熱処理後、チップ先端
部断面を顕微鏡で観察したところ、組織の1部にCu−
Sn合金の金属間化合物ε相が形成しているのが認めら
れた。
Comparative Example 3 An electrode chip with a Sn coating layer prepared by soldering similar to that of Comparative Example 2 was heated at 200 ° C. for 5 hours in the atmosphere to obtain a metal S.
Part of n was diffused into the electrode. After heat treatment, when observing the cross section of the tip of the chip with a microscope, Cu-
It was confirmed that the intermetallic compound ε phase of the Sn alloy was formed.

【0018】被溶接部材として板厚1mmの5083合金軟化
材(O材) を用い、前処理として市販の溶剤に浸漬して脱
脂し、水洗した後、アルカリクリーナ( インヒビターと
してケイ酸ソーダを含む炭酸ソーダ溶液、80℃) に5分
間浸漬し、水洗乾燥した。
As the member to be welded, a 5083 alloy softening material (O material) having a plate thickness of 1 mm was used, as a pretreatment, it was immersed in a commercially available solvent to degrease it, followed by washing with water, and then an alkali cleaner (carbonic acid containing sodium silicate as an inhibitor). It was immersed in a soda solution (80 ° C) for 5 minutes, washed with water and dried.

【0019】つぎに、実施例1〜4および比較例1〜3
により作製した電極のそれぞれ一対を前記前処理を行っ
た被溶接アルミニウム部材の表裏対称位置に置き、三相
低周波式スポット溶接機を使用し、溶接電流(実効電
流)2.2KA 、通電時間0.083 秒、予加圧900kgf、溶接圧
300kgfの溶接条件で1000回の連続スポット溶接をおこな
い、溶接回数10回毎にスポット溶接部の引張り剪断荷重
を測定した。さらに、スポット溶接部の引張り剪断荷重
がJIS Z 3140A級の171kgf/点未満となる連続スポット
溶接回数を測定し、その回数に達するまでのスポット溶
接部の引張り剪断荷重を溶接回数10回毎に測定してそれ
らの平均値を求めた。その結果を、表1に示した。
Next, Examples 1 to 4 and Comparative Examples 1 to 3
Place each pair of electrodes prepared in accordance with the above-mentioned pretreatment on the front and back symmetrical positions of the aluminum member to be welded, using a three-phase low-frequency spot welder, welding current (effective current) 2.2KA, energizing time 0.083 seconds , Preload 900kgf, welding pressure
Continuous spot welding was performed 1000 times under the welding condition of 300 kgf, and the tensile shear load of the spot weld was measured every 10 times of welding. Furthermore, the number of continuous spot weldings where the tensile shear load of the spot welds is less than 171kgf / point of JIS Z 3140A class is measured, and the tensile shear load of the spot welds until reaching the number is measured every 10th welding. Then, the average value of them was obtained. The results are shown in Table 1.

【0020】[0020]

【表1】 [Table 1]

【0021】表1の結果から、本発明による電極は、連
続スポット溶接試験において溶接部の強度の低下が小さ
く、連続使用に耐える良好な性能を示していることが認
められる。
From the results shown in Table 1, it is recognized that the electrode according to the present invention shows a small decrease in the strength of the welded portion in the continuous spot welding test and exhibits a good performance capable of withstanding continuous use.

【0022】[0022]

【発明の効果】以上のとおり、本発明により提供される
スポット溶接用電極は、連続かつ高速スポット溶接作業
における電極先端部の短時間損耗および溶接部の強度低
下の問題を解決する。特に、はんだ付けにより金属Sn
を被覆する方式を用いれば、スポット溶接現場において
も損耗した電極の修復を容易に行うことができる。
INDUSTRIAL APPLICABILITY As described above, the spot welding electrode provided by the present invention solves the problems of short-term wear of the electrode tip and reduced strength of the weld during continuous and high-speed spot welding work. Especially, metal Sn by soldering
If the method of coating the electrode is used, the worn electrode can be easily repaired even at the spot welding site.

フロントページの続き (72)発明者 米光 誠 愛知県名古屋市港区千年3丁目1番12号 住友軽金属工業株式会社技術研究所内 (72)発明者 熊谷 正樹 愛知県名古屋市港区千年3丁目1番12号 住友軽金属工業株式会社技術研究所内 (72)発明者 常川 雅功 愛知県名古屋市港区千年3丁目1番12号 住友軽金属工業株式会社技術研究所内 (56)参考文献 特開 昭61−226190(JP,A) 特開 平3−151170(JP,A) 特開 昭52−96946(JP,A)Front Page Continuation (72) Inventor Makoto Yonemitsu 3-12, 1000, Minen-ku, Aichi Prefecture, Nagoya, Japan Technical Research Institute, Sumitomo Light Metal Industry Co., Ltd. (72) Masaki Kumagai 3-chome, 3 years, Minato-ku, Aichi Prefecture No. 12 Sumitomo Light Metal Industry Co., Ltd. Technical Research Laboratory (72) Inventor Masanori Tsunekawa 3-1, 12th, Sennen, Minato-ku, Nagoya, Aichi Prefecture Sumitomo Light Metal Co., Ltd. Technical Research Laboratory (56) Reference JP-A-61-226190 ( JP, A) JP-A-3-151170 (JP, A) JP-A-52-96946 (JP, A)

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 アルミニウムまたはアルミニウム合金材
を被溶接部材とするスポット溶接用銅または銅合金電極
の被溶接部材に接触する部分にSnの被覆層を設けたこ
とを特徴とするスポット溶接用電極。
1. An aluminum or aluminum alloy material
An electrode for spot welding, characterized in that a coating layer of Sn is provided on a portion of a copper or copper alloy electrode for spot welding, which is a member to be welded, in contact with the member to be welded.
【請求項2】 Sn被覆層の厚さが0.03〜400 μm であ
る請求項1記載のスポット溶接用電極。
2. The electrode for spot welding according to claim 1, wherein the Sn coating layer has a thickness of 0.03 to 400 μm.
【請求項3】 Sn被覆層がめっきにより形成されてい
る請求項1または2記載のスポット溶接用電極。
3. The spot welding electrode according to claim 1, wherein the Sn coating layer is formed by plating.
【請求項4】 Sn被覆層がはんだ付けにより形成され
ている請求項1または2記載のスポット溶接用電極。
4. The electrode for spot welding according to claim 1, wherein the Sn coating layer is formed by soldering.
【請求項5】 Sn被覆層の1部が電極内に拡散し、C
u−Sn合金の金属間化合物ε相が形成されている請求
項1記載のスポット溶接用電極。
5. A portion of the Sn coating layer diffuses into the electrode to form C
The electrode for spot welding according to claim 1, wherein an intermetallic compound ε phase of a u-Sn alloy is formed.
JP3151006A 1991-05-27 1991-05-27 Spot welding electrode Expired - Lifetime JPH0813424B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3151006A JPH0813424B2 (en) 1991-05-27 1991-05-27 Spot welding electrode

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3151006A JPH0813424B2 (en) 1991-05-27 1991-05-27 Spot welding electrode
US07/890,017 US5334814A (en) 1991-05-27 1992-05-27 Electrode for spot welding
DE4217617A DE4217617A1 (en) 1991-05-27 1992-05-27 Spot welding electrode for welding aluminium@ parts - made of copper@ body with tin@ coated tips for holding parts to be welded

Publications (2)

Publication Number Publication Date
JPH04356375A JPH04356375A (en) 1992-12-10
JPH0813424B2 true JPH0813424B2 (en) 1996-02-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP3151006A Expired - Lifetime JPH0813424B2 (en) 1991-05-27 1991-05-27 Spot welding electrode

Country Status (1)

Country Link
JP (1) JPH0813424B2 (en)

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JP5018752B2 (en) * 2008-11-27 2012-09-05 富士通株式会社 Conductive material and method for producing conductive material
JP5252050B2 (en) * 2011-09-09 2013-07-31 富士通株式会社 Circuit board and method for manufacturing circuit board
JP5435095B2 (en) * 2012-09-12 2014-03-05 富士通株式会社 Circuit board and method for manufacturing circuit board
JP5257539B2 (en) * 2012-09-12 2013-08-07 富士通株式会社 Circuit board manufacturing method
JP5257546B2 (en) * 2012-10-23 2013-08-07 富士通株式会社 Manufacturing method of electronic equipment

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JPS61226190A (en) * 1985-03-30 1986-10-08 Nippon Mekki Kogyo Kk Electrode for spot welding
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