JPH01306078A - Resistance spot welding method - Google Patents
Resistance spot welding methodInfo
- Publication number
- JPH01306078A JPH01306078A JP63136196A JP13619688A JPH01306078A JP H01306078 A JPH01306078 A JP H01306078A JP 63136196 A JP63136196 A JP 63136196A JP 13619688 A JP13619688 A JP 13619688A JP H01306078 A JPH01306078 A JP H01306078A
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- oil
- welding
- tips
- spot welding
- 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.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910001335 Galvanized steel Inorganic materials 0.000 claims abstract description 18
- 239000008397 galvanized steel Substances 0.000 claims abstract description 18
- 229910001297 Zn alloy Inorganic materials 0.000 abstract description 4
- 230000008016 vaporization Effects 0.000 abstract description 4
- 238000009834 vaporization Methods 0.000 abstract description 4
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Resistance Welding (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は亜鉛めっき鋼板の抵抗スポット溶接方法に係り
、特に電極に亜鉛が付着することを防止するに好適な抵
抗スポット溶接方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a resistance spot welding method for galvanized steel sheets, and particularly to a resistance spot welding method suitable for preventing zinc from adhering to electrodes.
従来、亜鉛めっき鋼板の抵抗スポット溶接を行なう場合
、上下電極間に亜鉛めっき鋼板を挿入し、加圧力を加え
ながら溶接電流を流してジュール発熱によりスポット溶
接を行なっていた。このとき電極先端部に亜鉛が付着し
て溶接品質が低下する。Conventionally, when performing resistance spot welding of galvanized steel sheets, the galvanized steel sheet was inserted between upper and lower electrodes, and welding current was applied while applying pressure to perform spot welding using Joule heat generation. At this time, zinc adheres to the tip of the electrode, reducing welding quality.
この溶接品質の低下を防止するため、従来は電極の研磨
または交換を頻繁に行なう必要があった。In order to prevent this deterioration in welding quality, it has conventionally been necessary to frequently polish or replace the electrodes.
また、この種の抵抗スポット溶接における溶接品質の低
下を防ぐ手段としては、特開昭５７−９４４７７号公報
に記載されたように、ステンレス板の点溶接時に電極に
冷却水を供給して、ステンレス板の点溶接部の外表面の
酸化黒変を防止する方法や特開昭６２−２０７５８８号
公報に記載されたように、小熱容量被溶接材料の溶接す
べき個所を冷却用液体でぬらした状態で抵抗溶接を行な
い溶接部の昇温速度の抑制及び強度の向上を図る方法な
どが公知である。In addition, as a means to prevent deterioration of welding quality in this type of resistance spot welding, as described in Japanese Patent Application Laid-Open No. 57-94477, cooling water is supplied to the electrode during spot welding of stainless steel plates, and the stainless steel As described in the method for preventing oxidation blackening on the outer surface of spot welded parts of plates and in Japanese Patent Application Laid-Open No. 62-207588, the welding area of the material to be welded with a small heat capacity is wetted with a cooling liquid. A known method is to perform resistance welding to suppress the temperature rise rate and improve the strength of the welded part.
しかしながら、上記従来の亜鉛めっき鋼板の抵抗スポッ
ト溶接方法によると、電極先端に亜鉛が付着し、溶接品
質を低下させ電極寿命を低下させるという問題があった
。そのため溶接品質を維持するには電極の研磨または交
換を頻繁に行なわなければならず、生産性が低下しコス
トが上昇するという欠点があった。However, according to the conventional resistance spot welding method for galvanized steel sheets, there is a problem in that zinc adheres to the tip of the electrode, deteriorating welding quality and shortening the life of the electrode. Therefore, in order to maintain welding quality, the electrodes must be polished or replaced frequently, which has the disadvantage of decreasing productivity and increasing costs.
また、前記２件の公報に記載された提案のうち、前者は
ステンレス板の点溶接部の外表面の酸化黒変を防止する
ためのものであり、後者は小熱容量溶接材料の溶接部の
強度の向上を図るものであり。Furthermore, among the proposals described in the above two publications, the former is for preventing oxidation blackening on the outer surface of spot welds of stainless steel plates, and the latter is for improving the strength of welds of small heat capacity welding materials. The aim is to improve the
いずれも冷却水により電極を冷却するもので、亜鉛めっ
き鋼板の抵抗スポット溶接時の電極への亜鉛の付着防止
については配慮されていなかった。In both methods, the electrodes are cooled with cooling water, and no consideration was given to preventing zinc from adhering to the electrodes during resistance spot welding of galvanized steel sheets.
本発明は上記事情に鑑みてなされたものであり、溶接品
質を確保しつつ電極寿命の向上を図ることのできる抵抗
スポット溶接方法を提供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resistance spot welding method that can improve electrode life while ensuring welding quality.
本発明は上記目的を達成するために、亜鉛めっき鋼板の
抵抗スポット溶接方法において、溶接を行なう前に電極
先端の前記亜鉛めっき鋼板との当接部分に油を塗布する
ことを特徴とした方法である。In order to achieve the above object, the present invention provides a method for resistance spot welding galvanized steel sheets, which is characterized in that before welding, oil is applied to the contact portion of the electrode tip with the galvanized steel sheet. be.
〔作用〕
上記の方法によると、電極先端に塗布された油が溶接時
に発生するジュール熱によって気化し、その結果この気
化熱によって電極先端の温度上昇を抑えることができ、
亜鉛めっき鋼板の表面の亜鉛合金の溶融を抑制するとと
もに、塗布された油のため電極への付着量は少なくなる
。[Operation] According to the above method, the oil applied to the electrode tip is vaporized by the Joule heat generated during welding, and as a result, the temperature rise at the electrode tip can be suppressed by this vaporization heat.
This suppresses melting of the zinc alloy on the surface of the galvanized steel sheet, and reduces the amount of adhesion to the electrodes due to the applied oil.
以下、本発明に係る抵抗スポット溶接方法の一実施例を
図面を参照して説明する。An embodiment of the resistance spot welding method according to the present invention will be described below with reference to the drawings.
第１図に本発明の一実施例を示す６本実施例では１対の
上下電極１，２の間に被溶接部材である２枚の亜鉛めっ
き鋼板３，４が挿入されている。FIG. 1 shows one embodiment of the present invention. In this embodiment, two galvanized steel plates 3 and 4, which are members to be welded, are inserted between a pair of upper and lower electrodes 1 and 2.
上記の下部電極２は溶接機本体に固定されており、上部
電極１はエアシリンダ５によって昇降し、前記２枚の亜
鉛めっき鋼板３，４を下部電極２との間に挾持加圧し、
図示せぬ溶接電源から溶接電流を供給して抵抗スポット
溶接が行なわれる。The lower electrode 2 mentioned above is fixed to the welding machine main body, and the upper electrode 1 is raised and lowered by an air cylinder 5, and pressurizes the two galvanized steel plates 3 and 4 between it and the lower electrode 2.
Resistance spot welding is performed by supplying welding current from a welding power source (not shown).
また、前記エアシリンダ５には切替バルブ６が接続され
ており、この切替バルブ６を駆動させることにより図示
しない圧力空気室からの圧力エアによってエアシリンダ
５が作動し、前記上部電極１の昇降加圧が行なわれる。Further, a switching valve 6 is connected to the air cylinder 5, and by driving the switching valve 6, the air cylinder 5 is actuated by pressure air from a pressure air chamber (not shown), and the upper electrode 1 is raised and lowered. Pressure is applied.
一方、上下部電極１，２にはそれぞれの先端部に向かっ
て開口するノズル７．８が取り付けられており、これら
のノズル７．８の基端はそれぞれエアホース９を介して
前記切替バルブ６の開放側に接続されている。またノズ
ル７．８の基端近傍はそれぞれ管路１０．１１を介して
油タンク１２゜１３に接続されており、ノズル７．８を
通過するエアにより霧吹き状に油を吸入するようになっ
ている。On the other hand, nozzles 7.8 that open toward the tips of the upper and lower electrodes 1 and 2 are attached to each, and the base ends of these nozzles 7.8 are connected to the switching valve 6 through air hoses 9, respectively. Connected to the open side. The vicinity of the base ends of the nozzles 7.8 are connected to oil tanks 12 and 13 via pipes 10.11, respectively, and the air passing through the nozzles 7.8 sucks in oil in a mist-like manner. There is.
本実施例においては、スポット溶接を行なう前に切替バ
ルブ６の開放側から噴出する圧力エアをエアホース９を
介してノズル７．８に通し、油タンク１２．１３内の油
を吸入してノズル７．８の先端からエアとともに上下部
電極１，２の先端の亜鉛めっき鋼板３，４との当接部分
に吹き付けて油を塗布する。このときに塗布される油量
は、１回の溶接を行なった後に若干油が残る程度とする
ことが望ましい。In this embodiment, before spot welding, the pressure air jetted from the open side of the switching valve 6 is passed through the nozzle 7.8 via the air hose 9, and the oil in the oil tank 12.13 is sucked into the nozzle 7. Apply oil by spraying air from the tip of the .8 to the contact portions of the tips of the upper and lower electrodes 1 and 2 with the galvanized steel plates 3 and 4. The amount of oil applied at this time is preferably such that some oil remains after one welding.
本実施例によれば、溶接前に上下部電極１，２の先端の
亜鉛めっき鋼板３，４との当接部分に油が塗布されてい
るので、溶接時に発生するジュール熱によって油が気化
し、この気化熱によって電極１，２の先端の温度上昇を
抑えることができ、亜鉛めっき鋼板３，４の表面の亜鉛
合金の溶融を抑制するとともに、塗布された油によって
電極１゜２に付着する亜鉛の量を少なくすることができ
る。According to this embodiment, oil is applied to the tips of the upper and lower electrodes 1 and 2 that contact the galvanized steel plates 3 and 4 before welding, so that the oil is not vaporized by the Joule heat generated during welding. This heat of vaporization can suppress the temperature rise at the tips of the electrodes 1 and 2, suppressing the melting of the zinc alloy on the surface of the galvanized steel plates 3 and 4, and also preventing the zinc alloy from adhering to the electrodes 1 and 2 due to the applied oil. The amount of zinc can be reduced.
その結果、電極１，２の寿命を長くすることができ、電
極１，２の研磨、交換の頻度を少なくし、溶接品質を維
持しつつ生産性の向上とコストの低減を図ることができ
る。As a result, the life of the electrodes 1 and 2 can be extended, the frequency of polishing and replacement of the electrodes 1 and 2 can be reduced, and it is possible to improve productivity and reduce costs while maintaining welding quality.
なお、電極１，２の先端当接部分に塗布する油は適宜の
ものを選択して使用する。Note that an appropriate oil is selected and used for applying the abutting portions of the tips of the electrodes 1 and 2.
以上説明したように、本発明に係る亜鉛めっき鋼板の抵
抗スポット溶接方法によれば、溶接前に電極先端に油を
塗布するようにしたので、溶接時に油がジュール熱によ
り気化し、この気化熱によって電極の温度上昇を抑制す
ることができるとともに、塗布された油によって電極に
付着する亜鉛の量を少なくすることができる。その結果
電極の寿命を長くすることができ、電極の研磨、交換の
頻度を少なくし、溶接品質を維持しつつ生産性の向上と
コストの低減を図ることができる。As explained above, according to the resistance spot welding method for galvanized steel sheets according to the present invention, since oil is applied to the tip of the electrode before welding, the oil is vaporized by Joule heat during welding, and this vaporization heat This makes it possible to suppress the rise in temperature of the electrode, and also to reduce the amount of zinc that adheres to the electrode due to the applied oil. As a result, the life of the electrode can be extended, the frequency of electrode polishing and replacement can be reduced, and it is possible to improve productivity and reduce costs while maintaining welding quality.
第１図は本発明に係る抵抗スポット溶接方法の一実施例
に用いる装置を示す構成図である。
１．２・・・電極、
３．４・・・亜鉛めっき鋼板、
１２、１３・・・油タンク。FIG. 1 is a configuration diagram showing an apparatus used in an embodiment of the resistance spot welding method according to the present invention. 1.2... Electrode, 3.4... Galvanized steel plate, 12, 13... Oil tank.
Claims (1)
、溶接を行なう前に電極先端の前記亜鉛めっき鋼板との
当接部分に油を塗布することを特徴とする抵抗スポット
溶接方法。(1) A resistance spot welding method for galvanized steel sheets, the method comprising: applying oil to the contact portion of the electrode tip with the galvanized steel sheet before welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63136196A JPH01306078A (en) | 1988-06-02 | 1988-06-02 | Resistance spot welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63136196A JPH01306078A (en) | 1988-06-02 | 1988-06-02 | Resistance spot welding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01306078A true JPH01306078A (en) | 1989-12-11 |
Family
ID=15169587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63136196A Pending JPH01306078A (en) | 1988-06-02 | 1988-06-02 | Resistance spot welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01306078A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008254053A (en) * | 2007-04-09 | 2008-10-23 | Nippon Steel Corp | Spot welding method of tinned steel sheet |
| CN103357965A (en) * | 2012-03-31 | 2013-10-23 | 襄阳东昇机械有限公司 | Semi-automatic grinding machine for spot-welding electrode |
| KR101891724B1 (en) * | 2018-02-01 | 2018-08-27 | 김정규 | Apparatus for automatic spraying rust preventing oil of spot welder |
-
1988
- 1988-06-02 JP JP63136196A patent/JPH01306078A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008254053A (en) * | 2007-04-09 | 2008-10-23 | Nippon Steel Corp | Spot welding method of tinned steel sheet |
| CN103357965A (en) * | 2012-03-31 | 2013-10-23 | 襄阳东昇机械有限公司 | Semi-automatic grinding machine for spot-welding electrode |
| KR101891724B1 (en) * | 2018-02-01 | 2018-08-27 | 김정규 | Apparatus for automatic spraying rust preventing oil of spot welder |
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