JPS6150710B2 - - Google Patents
Info
- Publication number
- JPS6150710B2 JPS6150710B2 JP1654879A JP1654879A JPS6150710B2 JP S6150710 B2 JPS6150710 B2 JP S6150710B2 JP 1654879 A JP1654879 A JP 1654879A JP 1654879 A JP1654879 A JP 1654879A JP S6150710 B2 JPS6150710 B2 JP S6150710B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- chip
- tip
- main body
- 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.)
- Expired
Links
- 238000003466 welding Methods 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 229910001335 Galvanized steel Inorganic materials 0.000 description 15
- 239000008397 galvanized steel Substances 0.000 description 15
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 14
- 239000010937 tungsten Substances 0.000 description 14
- 229910052721 tungsten Inorganic materials 0.000 description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 11
- 239000011701 zinc Substances 0.000 description 11
- 229910052725 zinc Inorganic materials 0.000 description 11
- 229910000881 Cu alloy Inorganic materials 0.000 description 7
- 238000005336 cracking Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- ZTXONRUJVYXVTJ-UHFFFAOYSA-N chromium copper Chemical compound [Cr][Cu][Cr] ZTXONRUJVYXVTJ-UHFFFAOYSA-N 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0205—Non-consumable electrodes; C-electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Resistance Welding (AREA)
- Arc Welding In General (AREA)
Description
本発明は、スポツト溶接用電極の改良に関する
ものである。
The present invention relates to improvements in spot welding electrodes.
亜鉛メツキ鋼板は、近年、耐蝕性を備えた安価
な材料として評価され、その需要が増加してい
る。しかし、亜鉛メツキ鋼板のスポツト溶接に
は、溶接時に電極チツプと鋼板との間に介在する
亜鉛層が、電極チツプに付着したり、電極材料金
属と合金化したりするなどの悪影響を与え、電極
チツプの変形、導電性の低下ひいては被溶接材中
の電流密度の低下を起し、電極チツプが早期に消
耗し、あるいは亜鉛層が剥離するという問題があ
る。従来、この問題を解決するために、種々の努
力がなされているが、未だに十分に克服されてい
ない。
スポツト溶接の電極チツプは、被溶接材に直接
接触してこれに電流と加圧力と伝えるものであ
る。このため、電極チツプの先端部は、圧縮応力
を受けつつ被溶接材の昇温によつて加熱され、ま
た急速に冷却される。この熱履歴の一例として、
第１図に示した先端面の外径が12mmφ、長さが15
mmの円錐台形の電極チツプ１をチツプ本体２の先
端部に嵌着し、この本体２の外径を15mmφ、内径
を８mmφとし、本体２内に冷却水管３を挿入した
下部電極を用い、厚さ1.6mmの軟鋼板のスポツト
溶接を行つた場合の前記チツプ１の先端部ａ、末
端冷却面ｂ、冷却水管３の先端部ｃの各部の温度
変化は、第２図に示す通りである。
この場合の溶接条件は、電流11500A、通電時
間16サイクル、加圧力360Kg、ホールド時間４サ
イクル、溶接速度１点／１秒、冷却水量1.35／
分である。第２図から明らかなように、電極チツ
プ１先端部は１点の溶接で約250℃に達し、以後
溶接点数の増加に従つて５〜６点の溶接で約400
℃の最高加熱温度に達する。
そして、亜鉛メツキ鋼板のスポツト溶接は、溶
接条件を高めにすることが好ましいとされてい
る。そこで、上記の厚さ1.6mmの軟鋼板よりかな
り薄い厚さ1.0mmの亜鉛メツキ鋼板ではあるが、
溶接条件を上記軟鋼板の場合より高めにするため
電流、通電時間だけを、それぞれ10400A、19サ
イクルに変えたところ、第１図の電極のチツプ先
端部は、１点の溶接で、第３図に示すような熱履
歴を有することが測定された。
これによればチツプ先端部は、１点の溶接で亜
鉛の融点である419℃よりも遥かに高い600℃の温
度に達している。従つて、第２図の軟鋼板の例か
ら多点連続して溶接した場合には、チツプ先端部
の温度は600℃よりさらに上昇すると類推され
る。
従来のこの種の電極チツプの材料としては、ク
ロム銅のような銅合金が使用されているが、クロ
ム銅の電極チツプを用いて亜鉛メツキ鋼板を溶接
した場合の下部電極側の前記鋼板の凹みを測定す
ると、第４図のようになる。この凹みａは、主と
して亜鉛層の電極チツプへの付着による剥離に起
因しており、この剥離は初期の溶接打点では起こ
らないが、300点では既に烈しく剥離が生じてい
ることがわかる。また、一般にSPCC−１の電極
チツプでは、400〜800点の溶接打点を周期として
研磨するのが標準となつている。
前述したように、従来の電極チツプに使用され
ていた材料はクロム銅などの銅合金で、銅合金は
亜鉛との親和力が強く、溶融亜鉛との濡れもよ
く、また、前述したように電極チツプの先端部は
亜鉛の融点以上の温度に加熱されるので、銅合金
や銅からなる電極チツプへの亜鉛の付着は避けら
れない。
そこで、近年、銅合金以外の材料を用いた電極
チツプの研究が行われて、既に米国特許第
3779714号明細書cl 29（1973）には、焼結合金を
溶接機の電極チツプとして用いることが開示され
ており、さらに、第５図に示すようにタングステ
ンＷを用いた電極チツプ１１を電極本体１２の先
端部に嵌着したものも開発された。
タングステンは、第６図から明らかなように熱
伝導率と比抵抗が銅Cuと鉄Feのそれらの中間に
あり、タングステンからなる電極チツプを用いて
前記第４図の場合と同様な実験を行つたところ、
亜鉛メツキ鋼板の凹みについて第７図の結果が得
られた。そして第７図から明らかなように、650
点の溶接打点でもタングステンの電極チツプでは
亜鉛層の剥離がほとんど生じないので、亜鉛メツ
キ鋼板のスポツト溶接用電極の電極チツプとして
タングステンは有望な材料と考えられる。
In recent years, galvanized steel sheets have been evaluated as corrosion-resistant and inexpensive materials, and the demand for them is increasing. However, when spot welding galvanized steel sheets, the zinc layer interposed between the electrode tip and the steel sheet during welding has negative effects such as adhering to the electrode tip or alloying with the electrode material metal. This causes problems such as deformation of the electrode, a decrease in conductivity and a decrease in current density in the welded material, premature wear of the electrode tip, and peeling of the zinc layer. Conventionally, various efforts have been made to solve this problem, but it has not yet been satisfactorily overcome. The electrode tip for spot welding directly contacts the material to be welded and transmits current and pressure to it. Therefore, the tip of the electrode tip is heated by the temperature rise of the welded material while being subjected to compressive stress, and is rapidly cooled. As an example of this thermal history,
The outer diameter of the tip surface shown in Figure 1 is 12mmφ, and the length is 15mm.
A truncated cone-shaped electrode chip 1 with a diameter of When spot welding mild steel plates with a diameter of 1.6 mm, temperature changes at each part of the tip a of the chip 1, the end cooling surface b, and the tip c of the cooling water pipe 3 are as shown in FIG. The welding conditions in this case are: current 11500A, energization time 16 cycles, pressurizing force 360Kg, hold time 4 cycles, welding speed 1 point/1 second, cooling water amount 1.35/1.
It's a minute. As is clear from Fig. 2, the tip of the electrode tip 1 reaches approximately 250°C with one welding point, and thereafter, as the number of welding points increases, the temperature reaches approximately 400°C with welding of 5 to 6 points.
Reach maximum heating temperature of °C. When spot welding galvanized steel sheets, it is said that it is preferable to use high welding conditions. Therefore, although it is a galvanized steel sheet with a thickness of 1.0 mm, which is much thinner than the above-mentioned 1.6 mm thick mild steel sheet,
In order to make the welding conditions higher than in the case of the above-mentioned mild steel plate, we changed only the current and energization time to 10,400 A and 19 cycles, respectively. It was determined that the material had a thermal history as shown in . According to this, the tip of the chip reaches a temperature of 600°C, which is much higher than the melting point of zinc, 419°C, when welding at one point. Therefore, from the example of the mild steel plate in FIG. 2, it can be inferred that if multiple points are continuously welded, the temperature at the tip end will rise even further than 600°C. Conventionally, a copper alloy such as chromium copper is used as the material for this type of electrode tip, but when a galvanized steel plate is welded using a chromium copper electrode tip, there is a dent in the steel plate on the lower electrode side. When measured, the results are as shown in Figure 4. This depression a is mainly caused by peeling of the zinc layer due to its adhesion to the electrode chip, and although this peeling does not occur at the initial welding points, it can be seen that severe peeling has already occurred at the 300th welding point. In general, it is standard for SPCC-1 electrode chips to be polished at intervals of 400 to 800 welding points. As mentioned above, the material used for conventional electrode chips is copper alloy such as chromium copper. Copper alloy has a strong affinity with zinc and wets well with molten zinc. Since the tip of the electrode is heated to a temperature above the melting point of zinc, adhesion of zinc to the copper alloy or copper electrode tip is unavoidable. Therefore, in recent years, research has been carried out on electrode chips using materials other than copper alloys, and a US patent has already been published.
3779714 specification cl 29 (1973) discloses the use of a sintered alloy as an electrode tip for a welding machine, and furthermore, as shown in FIG. A type that fits on the tip of 12 was also developed. As is clear from Figure 6, the thermal conductivity and resistivity of tungsten are between those of copper (Cu) and iron (Fe), and an experiment similar to that shown in Figure 4 was conducted using an electrode tip made of tungsten. At the end of the day,
The results shown in Figure 7 were obtained regarding the dents in the galvanized steel sheet. And as is clear from Figure 7, 650
Since tungsten electrode tips hardly cause peeling of the zinc layer even at spot welding points, tungsten is considered to be a promising material for electrode tips for spot welding electrodes for galvanized steel sheets.
しかし、タングステンの電極チツプは、タング
ステンの粒子を素材とした焼結金属から構成され
ているので、脆く割れた生じ易く、寿命が短いと
いう欠点があり、このため、その実用化が妨げら
れていた。
そこで本発明は、前記のような焼結金属からな
る電極チツプの割れの発生原因を究明し、この割
れを防止した新規な電極チツプを得ることによ
り、完成されたものである。
すなわち、焼結金属からなる電極チツプに割れ
が発生する原因について検討したところ、
(i) 被溶接材に加圧力を伝えることにより生じ、
時には衝撃的に働く圧縮応力
(ii) 不均一なチツプ内部の温度分布
(iii) 急激な温度の上昇と下降
などが挙げられる。そしてこれらの因子は、いず
れもスポツト溶接では必然的に発生するものであ
る。また、割れが発生する２次的な要因として
は、焼結金属からなる電極チツプは脆く、このチ
ツプの側面方向の変形が比較的容易であるためと
考えられる。
従つて、本発明では、焼結金属からなるチツプ
主体の側面方向への変形を拘束すれば割れの発生
を阻止できることに鑑み、チツプ主体を、金属製
の保持リング内でチツプ主体素材を加圧、加熱し
て焼結させたものとし、前記保持リングと一体化
することにより変形や割れが起こりにくく、かつ
亜鉛メツキ鋼板の溶接時に亜鉛の付着が生じにく
い電極チツプの実用化を可能にしたスポツト溶接
用電極を容易に提供できるようにすることを目的
とするものである。
However, since tungsten electrode chips are made of sintered metal made from tungsten particles, they have the drawbacks of being brittle, prone to cracking, and having a short lifespan, which has hindered their practical use. . Therefore, the present invention was completed by investigating the cause of cracks in electrode chips made of sintered metal as described above, and by obtaining a new electrode chip that prevents such cracks. In other words, when we investigated the causes of cracks in electrode tips made of sintered metal, we found that (i) cracks occur due to the transmission of pressure to the material to be welded;
Examples include compressive stress that sometimes acts as an impact, (ii) uneven temperature distribution inside the chip, and (iii) rapid temperature rises and falls. All of these factors inevitably occur in spot welding. Further, a secondary cause of cracking is thought to be that the electrode chip made of sintered metal is brittle and deforms in the lateral direction relatively easily. Therefore, in the present invention, in view of the fact that cracking can be prevented by restraining the deformation of the chip main body made of sintered metal in the lateral direction, the chip main body is pressurized within a metal retaining ring. A spot that is heated and sintered, and is integrated with the retaining ring, making it difficult to deform or crack, and to make it possible to put into practical use an electrode tip that is less prone to adhesion of zinc during welding of galvanized steel sheets. The purpose is to make it possible to easily provide welding electrodes.
前記目的を達成するために、本発明によるスポ
ツト溶接用電極は、金属製の保持リング内にチツ
プ主体の素材を充填し、これを加圧、加熱して焼
結することにより、前記リングと一体にチツプ主
体を成型した電極チツプを備え、この電極チツプ
は、先端面ではチツプ主体と保持リングとが同一
平面上に位置し、チツプ主体の末端面から保持リ
ングの末端部が突出しており、この突出部を電極
本体の先端部に形成した環状溝に嵌着し、チツプ
主体の後端面を電極本体の先端面に密着当接した
ことを特徴とするものである。
In order to achieve the above object, the spot welding electrode according to the present invention is integrated with the ring by filling a metal retaining ring with a chip-based material and pressurizing, heating and sintering the material. The electrode tip has an electrode tip whose tip body is molded on the tip, and the tip body and the retaining ring are located on the same plane at the distal end surface, and the distal end of the retaining ring protrudes from the distal end surface of the tip body. The protrusion is fitted into an annular groove formed at the tip of the electrode body, and the rear end surface of the chip body is brought into close contact with the tip surface of the electrode body.
以下、図面を参照して本発明の一実施例を具体
的に説明する。
第８図において、符号２１は電極チツプで、こ
のチツプ２１は、タングステンの粒子を必要に応
じてバインダーと共に析出硬化型ステンレス鋼で
あるSUS630鋼からなる保持リング２４を型とし
てその内部に充填し充填物を軸方向から加圧しつ
つ全体を加熱することにより、タングステン粒子
を焼結させてチツプ主体２５を前記リング２４内
にこれと一体に成型させたものである。
前記電極チツプ２１は、先端面ではチツプ主体
２５とリング２４とが同一平面上に位置している
が、チツプ主体２５の末端面からリング２４の末
端部が突出しており、この突出部を、圧入嵌合に
よつて銅または銅合金からなる電極本体２２の先
端部に形成した環状溝２６に嵌着し、電極本体２
２の先端面外周部から電極チツプ２１を突出させ
たものである。
なお、電極チツプ２１の製造に当り、保持リン
グ２４を弾性変形させてその径を拡げ、チツプ主
体２５を外周側から中心に向つて押圧するような
残留応力をもたせておくことが好ましい。
以上のように構成された電極は、亜鉛メツキ鋼
板を被溶接材２７とする溶接時に、第９図に示す
ようにタングステンからなるチツプ主体２５に作
用する外力は、電極本体２２からの加圧力F1
と、被溶接材２７からの反力F2と、これらによ
るチツプ主体２５外側に作用する力に対するリン
グ２４からの拘束力F3であり、この拘束力F3に
よつてチツプ主体２５に作用する外力は、静水圧
状態に近づく。従つて、チツプ主体２５がタング
ステンの焼結金属から構成してあつても、これに
割れが生じにくい。
なお、本発明のチツプ主体は、前述したタング
ステンからなるものに限られることなく、モリブ
テンや、タングステン、モリブデンの合金などの
焼結合金を含む焼結金属からなるチツプ主体に広
く適用できる。
また、保持リングは、常温から電極チツプの最
高上昇温度すなわち700℃程度までの温度範囲で
比較的高い強度と靭性を有する金属であれば、必
ずしも実施例の材料に限られるものではない。
さらに、電極チツプは、電極本体に焼嵌めして
固定してもよい。
Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In FIG. 8, reference numeral 21 denotes an electrode chip, and this chip 21 is filled with tungsten particles using a retaining ring 24 made of SUS630 steel, which is a precipitation hardening type stainless steel, as a mold, along with a binder as necessary. By heating the entire body while applying pressure in the axial direction, the tungsten particles are sintered and the chip main body 25 is integrally molded into the ring 24. In the electrode tip 21, the tip main body 25 and the ring 24 are located on the same plane at the distal end surface, but the distal end of the ring 24 protrudes from the distal end surface of the tip main body 25, and this protrusion is press-fitted. By fitting, the electrode body 22 is fitted into an annular groove 26 formed at the tip of the electrode body 22 made of copper or copper alloy.
An electrode chip 21 is made to protrude from the outer periphery of the distal end surface of 2. In manufacturing the electrode chip 21, it is preferable that the retaining ring 24 is elastically deformed to enlarge its diameter and to have a residual stress that presses the chip main body 25 from the outer periphery toward the center. In the electrode configured as described above, when welding a galvanized steel plate as the material to be welded 27, the external force acting on the chip main body 25 made of tungsten is the pressure force F from the electrode main body 22, as shown in FIG. 1
, a reaction force F 2 from the material to be welded 27, and a restraining force F 3 from the ring 24 against the force acting on the outside of the chip main body 25 due to these, and this restraining force F 3 acts on the chip main body 25. The external force approaches a hydrostatic pressure condition. Therefore, even if the chip main body 25 is made of sintered tungsten metal, it is unlikely to be cracked. The chip main body of the present invention is not limited to the one made of tungsten described above, but can be widely applied to chip main bodies made of sintered metals including molybdenum and sintered alloys such as tungsten and molybdenum alloys. Further, the material of the retaining ring is not necessarily limited to the material of the embodiment, as long as it is a metal that has relatively high strength and toughness in the temperature range from room temperature to the maximum temperature rise of the electrode chip, that is, about 700°C. Furthermore, the electrode chip may be fixed by shrink-fitting to the electrode body.
【発明の効果】
以上説明したように、本発明のスポツト溶接用
電極は、金属性の保持リングを型としてこのリン
グ内でチツプ主体の素材を加圧、加熱してチツプ
主体を焼結し、これを前記リングと一体に成型し
たものであるから、例えばタングステンなどの脆
い金属でチツプ主体を構成しても、その割れを保
持リングで阻止することができ、チツプ主体と保
持リングが一体化しているのでこれらの密着性が
よく、割れの阻止が確実であり、タングステン、
モリブデンまたはこれらの合金などからなるチツ
プ主体を用いることにより、亜鉛メツキ鋼板の溶
接時に、亜鉛層の剥離がなく、チツプ主体の消耗
が少なくかつ割れも防止されるのでその寿命が長
いという利点が得られ、さらに、チツプ主体を容
易かつ確実に保持リング内に設けることができる
ので、焼結金属からなるチツプ主体を備えたチツ
プを容易に提供できる。
また、電極チツプは、チツプ主体の末端面から
保持リングの末端部を突出してこれを電極本体の
先端部に形成した環状溝に嵌着し、チツプ主体の
後端面を電極本体の先端面に密着当接したので、
その消耗時には、電極本体に対して電極チツプの
みを交換すれば良く、従つて、経済的である。
なお、本発明の溶接用電極は、亜鉛メツキ鋼板
の上下電極として使用できるだけではなく、それ
以外の被溶接材のスポツト溶接にも使用でき、こ
の場合でも電極チツプの寿命が長いという効果が
得られる。[Effects of the Invention] As explained above, the spot welding electrode of the present invention uses a metallic retaining ring as a mold, pressurizes and heats a material mainly consisting of chips within this ring, and sinters the mainly chips. Since this is molded integrally with the ring, even if the chip main body is made of a brittle metal such as tungsten, the retaining ring can prevent the chip from cracking, and the chip main body and the retaining ring are integrated. These materials have good adhesion and are sure to prevent cracking.
By using chips mainly made of molybdenum or these alloys, there is no peeling of the zinc layer when welding galvanized steel sheets, and there is less wear and tear on the chips, which prevents cracking, resulting in a long life. Furthermore, since the chip main body can be easily and reliably provided within the retaining ring, it is possible to easily provide a chip with the chip main body made of sintered metal. In addition, the electrode tip has the distal end of the retaining ring protruding from the distal end surface of the chip body, and is fitted into an annular groove formed at the distal end of the electrode body, so that the rear end surface of the chip body is tightly attached to the distal end surface of the electrode body. Because I came into contact with
When it wears out, it is only necessary to replace the electrode tip with respect to the electrode body, which is therefore economical. Furthermore, the welding electrode of the present invention can be used not only as upper and lower electrodes for galvanized steel sheets, but also for spot welding of other materials to be welded, and even in this case, the effect of long life of the electrode tip can be obtained. .
第１図は銅合金からなる電極チツプを備えたス
ポツト溶接用電極の要部を示す側断面図、第２図
は第１図の電極による軟鋼板溶接時の電極チツプ
の時間−温度特性図、第３図は同亜鉛メツキ鋼板
の１回の溶接の温度特性図、第４図は第１図の電
極による亜鉛メツキ鋼板溶接時の溶接回数−亜鉛
メツキ鋼板の凹み特性図、第５図はタングステン
からなる電極チツプを備えたスポツト溶接用電極
の要部を示す側断面図、第６図は各種金属材料の
熱伝導率−比抵抗特性図、第７図は第６図の電極
による亜鉛メツキ鋼板溶接時の溶接回数−亜鉛メ
ツキ鋼板の凹み特性図、第８図は本発明の一実施
例によるスポツト溶接用電極の要部を示す側断面
図、第９図は同作用説明図である。
１，１１，２１……電極チツプ、２，１２，２
２……電極本体、３……冷却水管、２４……保持
リング、２５……チツプ主体、２６……環状溝、
２７……被溶接材。
Fig. 1 is a side sectional view showing the main parts of a spot welding electrode equipped with an electrode tip made of copper alloy, Fig. 2 is a time-temperature characteristic diagram of the electrode tip when welding a mild steel plate with the electrode of Fig. 1, Figure 3 is a temperature characteristic diagram for one welding of the galvanized steel sheet, Figure 4 is a diagram of the number of welds vs. denting of the galvanized steel plate when welding the galvanized steel plate using the electrode in Figure 1, and Figure 5 is a tungsten steel sheet welding temperature characteristic diagram. 6 is a thermal conductivity-resistivity characteristic diagram of various metal materials, and FIG. 7 is a galvanized steel plate using the electrode shown in FIG. 6. FIG. 8 is a sectional side view showing the essential parts of a spot welding electrode according to an embodiment of the present invention, and FIG. 9 is an explanatory diagram of the same action. 1, 11, 21...electrode chip, 2, 12, 2
2... Electrode body, 3... Cooling water pipe, 24... Retaining ring, 25... Chip main body, 26... Annular groove,
27... Material to be welded.
Claims (1)
充填し、これを加圧、加熱して焼結することによ
り、前記リングと一体にチツプ主体を成型した電
極チツプを備え、この電極チツプは、先端面では
チツプ主体と保持リングとが同一平面上に位置
し、チツプ主体の末端面から保持リングの末端部
が突出しており、この突出部を電極本体の先端部
に形成した環状溝に嵌着し、チツプ主体の後端面
を電極本体の先端面に密着当接したことを特徴と
するスポツト溶接用電極。1. A metal holding ring is filled with a chip-based material, and the material is pressurized, heated, and sintered to form an electrode chip that is made of a chip-based material integrally with the ring. At the distal end surface, the tip main body and the retaining ring are located on the same plane, and the distal end of the retaining ring protrudes from the distal end surface of the tip main body, and this protruding portion is fitted into the annular groove formed at the distal end of the electrode main body. A spot welding electrode characterized in that the rear end surface of the chip is brought into close contact with the front end surface of the electrode body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1654879A JPS55109584A (en) | 1979-02-15 | 1979-02-15 | Electrode for spot welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1654879A JPS55109584A (en) | 1979-02-15 | 1979-02-15 | Electrode for spot welding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55109584A JPS55109584A (en) | 1980-08-23 |
| JPS6150710B2 true JPS6150710B2 (en) | 1986-11-05 |
Family
ID=11919315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1654879A Granted JPS55109584A (en) | 1979-02-15 | 1979-02-15 | Electrode for spot welding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55109584A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632587U (en) * | 1986-06-19 | 1988-01-09 | ||
| CN103350277A (en) * | 2013-07-22 | 2013-10-16 | 哈尔滨凌云汽车零部件有限公司 | Combination electrode for welding gun for welding vehicle door galvanized sheet |
| CN115138956A (en) * | 2022-07-20 | 2022-10-04 | 湖北超卓航空科技股份有限公司 | Steel core composite electrode for high-elasticity alloy and spot welding process thereof |
-
1979
- 1979-02-15 JP JP1654879A patent/JPS55109584A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55109584A (en) | 1980-08-23 |
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