JP2685952B2 - Plasma torch cleaning method - Google Patents
Plasma torch cleaning methodInfo
- Publication number
- JP2685952B2 JP2685952B2 JP2029182A JP2918290A JP2685952B2 JP 2685952 B2 JP2685952 B2 JP 2685952B2 JP 2029182 A JP2029182 A JP 2029182A JP 2918290 A JP2918290 A JP 2918290A JP 2685952 B2 JP2685952 B2 JP 2685952B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- nozzle member
- plasma torch
- injection port
- electrode rod
- 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
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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/328—Cleaning of weld torches, i.e. removing weld-spatter; Preventing weld-spatter, e.g. applying anti-adhesives
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、溶接，切断，加熱等の加工を行なうプラズ
マトーチに関し、特に、その使用中に加工対象材等から
飛散又は蒸発してトーチのガス噴射口等に付着した溶着
金属等の付着物を除去するクリーニング方法に関する。Description: TECHNICAL FIELD The present invention relates to a plasma torch that performs processing such as welding, cutting, and heating, and particularly to a torch that scatters or evaporates from a material to be processed during use. The present invention relates to a cleaning method for removing deposits such as weld metal attached to a gas injection port or the like.
プラズマトーチによる加工例えば鋼材の溶接において
は、トーチからの噴射プラズマが鋼材に当たってその部
位が溶融し、そこで溶融金属が飛散したり蒸発したし
て、それらの一部がプラズマトーチのノズル部材の端面
（鋼材に対向する面），ガス噴射口および電極棒の先端
部等に溶着する。この付着量が多くなると、アークの指
向点が偏位したり動揺したりするなど、不安定になっ
て、溶接不良をもたらす。そこで従来は１〜３時間おき
に、プラズマトーチの使用を停止して、工具で溶着金属
を掻き落すなどにより、トーチのガス噴射口まわりを掃
除している。Processing by plasma torch For example, in welding of steel material, injection plasma from the torch hits the steel material and melts that portion, where the molten metal is scattered or evaporated, and part of them is the end surface of the nozzle member of the plasma torch ( It is welded to the surface facing the steel), the gas injection port and the tip of the electrode rod. If this amount of adhesion increases, the arc pointing point becomes unstable or swayed, resulting in instability and poor welding. Therefore, conventionally, the use of the plasma torch is stopped every 1 to 3 hours, and the weld metal is scraped off with a tool to clean the area around the gas injection port of the torch.
このような掃除は手作業であるので、トーチが冷えて
から行なわなければならず、付着金属が凝固しているの
で除去しにくく、また、ガス噴射口等を傷付けないよう
に行なわなければならないので、かなりわずらわしい作
業である。Since such cleaning is a manual work, it must be done after the torch has cooled down, it is difficult to remove because the adhered metal is solidified, and it must be done so as not to damage the gas injection port. It's a very troublesome task.
本発明では、加工対象物に対する該プラズマトーチの
使用の終了時に、パイロットアークを維持するためにノ
ズル部材へのガス供給と電極棒への通電を継続し、使用
終了時の加工対象材の加工位置に対してプラズマトーチ
が非作用となる時間後に、パイロットアークがガス流に
より弧状に曲って延びる流量に、前記ノズル部材へのガ
ス供給流量を高くして、高温，高速のガス流により前記
ガス噴射口および電極棒の付着物を吹飛ばす。In the present invention, at the end of use of the plasma torch for the object to be processed, gas supply to the nozzle member and energization to the electrode rod are continued to maintain the pilot arc, and the processing position of the object to be processed at the end of use After the time when the plasma torch becomes inactive, the pilot arc increases the gas supply flow rate to the nozzle member to a flow rate extending in an arc shape by the gas flow, and the gas injection is performed by the high temperature and high speed gas flow. Blow away deposits on mouth and electrode rod.
電極棒に通電を継続しているので、ガス噴射口部およ
び電極棒の付着物は溶融状態にあり、かつノズル部材か
らそのガス噴射口を通して噴射するガス量が多量であっ
てパイロットアークがガス流により弧状に曲ってアーク
長が延び、噴射口まわりを周回移動又は動揺移動し、こ
れにより噴射口周りの比較的に広い面積に渡って、付着
物が溶融して吹飛ばされる。ガス吹きの力が大きいの
で、付着物がノズル部材の外部に、吹飛ばされる。Since the electrode rod continues to be energized, the deposits on the gas injection port and the electrode rod are in a molten state, and the amount of gas injected from the nozzle member through the gas injection port is large and the pilot arc produces a gas flow. Due to this, the arc length is extended by bending in an arc shape, and the arc moves around or oscillates around the injection port, whereby the adhered matter is melted and blown off over a relatively large area around the injection port. Since the force of gas blowing is large, the adhered matter is blown off to the outside of the nozzle member.
したがって本発明の実施によれば、プラズマトーチの
使用を終了したときには、ガス噴射口まわりの付着物の
残留量が少なくなり、ガス噴射口まわりの目視点検や手
作業によるクリーニング作業は、長期間の使用毎に行え
ばよい。また手作業によるるクリーニング作業におい
て、付着物の残留量が少いので作業量が低減する。Therefore, according to the implementation of the present invention, when the use of the plasma torch is finished, the residual amount of the deposit around the gas injection port is reduced, and the visual inspection around the gas injection port and the manual cleaning work are performed for a long time. It should be done after each use. Further, in the manual cleaning work, the amount of remaining adhered substances is small, so the work amount is reduced.
本発明の他の目的および特徴は、図面を参照した以下
の実施例の説明より明らかになろう。Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.
第１図に、本発明を一態様で実施する装置構成を示
す。プラズマトーチ10のノズル部分１には、流量調節弁
AV1および電磁開閉弁SOL1を通して、センターガスが供
給されて、ノズル部材１の先端のガス噴射口２より噴射
される。ノズル部材１の外側の空間に、流量調節弁AV3
および電磁開閉弁SOL3を通して、シールドガスが供給さ
れて、ノズル部材１の先端の外側のリング状のガス噴射
口より噴射される。アークを起動するときには、パイロ
ット接片Rpcが閉じられこれによりパイロット電源４の
電圧がノズル部材１と電極棒３の間に印加されて、両者
間にパイロットアークを発生する。この状態でメイン接
片Rmc1が閉じられるとこれによりメイン電源６の電圧が
加工対象材５と電極棒３の間に印加されて、両者間にメ
インアークを発生する。このメインアークにより電離さ
れたプラズマがガス噴射口２から加工対象材５に噴射す
る。なお、第１図は移行型のプラズマトーチを示してい
る。非移行型の場合には、電源６が省略され、パイロッ
ト電源４がメイン電源とされる。FIG. 1 shows an apparatus configuration for implementing the present invention in one embodiment. The nozzle part 1 of the plasma torch 10 has a flow control valve.
The center gas is supplied through the AV1 and the solenoid on-off valve SOL1 and is injected from the gas injection port 2 at the tip of the nozzle member 1. In the space outside the nozzle member 1, the flow rate control valve AV3
Further, the shield gas is supplied through the electromagnetic on-off valve SOL3 and is injected from the ring-shaped gas injection port outside the tip of the nozzle member 1. When the arc is started, the pilot contact Rpc is closed, whereby the voltage of the pilot power supply 4 is applied between the nozzle member 1 and the electrode rod 3, and the pilot arc is generated between the two. When the main contact piece Rmc 1 is closed in this state, the voltage of the main power supply 6 is applied between the workpiece 5 and the electrode rod 3 to generate a main arc therebetween. The plasma ionized by the main arc is jetted from the gas jet port 2 to the workpiece 5. Incidentally, FIG. 1 shows a transfer type plasma torch. In the non-transition type, the power supply 6 is omitted and the pilot power supply 4 is used as the main power supply.
以上の構成は、従来のプラズマトーチにおいて公知の
ものである。次に本発明の実施のために付加された要素
を説明すると、流量調節弁AV1と電磁開閉弁SOL1の直列
回路に並列に、流量調節弁AV2と電磁開閉弁SOL2の直列
回路が接続されており、流量調節弁AV2は、高流量F2で
センターガスをノズル部材１に供給するように設定され
ている。The above configuration is well known in the conventional plasma torch. Explaining the elements added for implementing the present invention, the series circuit of the flow rate control valve AV1 and the solenoid on-off valve SOL2 is connected in parallel to the series circuit of the flow rate control valve AV1 and the solenoid on-off valve SOL1. The flow rate control valve AV2 is set to supply the center gas to the nozzle member 1 at a high flow rate F2.
プラズマトーチ10へのガス供給および通電を制御する
電気回路すなわち制御回路20のパイロットスイッチSWP
が閉じられると、電磁開閉弁SOL1が通電されて開になっ
てノズル部材１にセンターガスが供給されると共に、リ
レーコイルRpが通電されてパイロット接片Rpcが閉じて
パイロット電源４の電圧がノズル部材１と電極棒３の間
に印加されて両者間にパイロットアークを発生する。Electric circuit for controlling gas supply and energization to the plasma torch 10, that is, the pilot switch SWP of the control circuit 20
When is closed, the solenoid on-off valve SOL1 is energized and opened to supply the center gas to the nozzle member 1, and the relay coil Rp is energized to close the pilot contact piece Rpc and the voltage of the pilot power supply 4 is changed to the nozzle. It is applied between the member 1 and the electrode rod 3 to generate a pilot arc between them.
次に、メインスイッチSWMが閉じられると、電磁開閉
弁SOL3が通電されて開になってトーチ10にシールドガス
が供給されると共に、リレーコイルRmが通電されてメイ
ン接片Rmc1が閉じこれによりメイン電源６の電圧が加工
対象材５と電極棒３の間に印加されて、両者間にメイン
アークを発生する。このメインアークにより電離された
プラズマがガス噴射口２から加工対象材５に噴射する。
ここでプラズマトーチ10により加工対象材５に溶接加工
が施こされる。なお、リレーコイルRmの通電により、接
片Rmc2が閉じRmc3が開く。接片Rmc2の閉によりリレーコ
イルR1が通電されて自己保持接片R1cを閉じる。接片Rcm
3が開いたので、タイマT1はスタートしない。Then, the main switch SWM is closed, the shielding gas is supplied to the torch 10 solenoid valve SOL3 is in the open is energized and relay coil Rm is energized main contact piece Rmc 1 closed thereby The voltage of the main power source 6 is applied between the workpiece 5 and the electrode rod 3 to generate a main arc between them. The plasma ionized by the main arc is jetted from the gas jet port 2 to the workpiece 5.
Here, the plasma torch 10 welds the material 5 to be processed. When the relay coil Rm is energized, the contact piece Rmc 2 is closed and Rmc 3 is opened. By closing the contact piece Rmc 2, the relay coil R 1 is energized and the self-holding contact piece R 1c is closed. Contact piece Rcm
Since 3 is opened, the timer T1 does not start.
メインスイッチSWMが開に戻る（溶接が終了する）
と、メイン接片Rmc1が開いてこれによりメイン電源６が
遮断されて加工対象材５と電極棒３の間のメインアーク
が消滅し、かつ、電磁開閉弁SOL3の通電が止まり、シー
ルドガスの噴射が停止する。同時に、接片Rmc3が閉じ
て、自己保持接片R1c−接片T2c−接片Rmc3のループでタ
イマT1が通電されて、時限動作をスタートする。なお、
スイッチSWPが閉じているので、リレーコイルRpの通電
は継続しまた電磁開閉弁SOL1の通電も継続するので、セ
ンターガスは継続して流量F1でノズル部材１に供給さ
れ、ノズル部材１の噴射口２と電極棒３の間のパイロッ
トアークも継続する。Main switch SWM returns to open (welding ends)
Then, the main contact piece Rmc 1 is opened, which shuts off the main power source 6 to extinguish the main arc between the workpiece 5 and the electrode rod 3, and the electromagnetic on-off valve SOL 3 is deenergized to shield the shield gas. Injection stops. At the same time, closes the contact piece Rmc 3, the timer T1 is energized by the loop of the self-holding contact piece R1c- contact piece T2c- contact piece Rmc 3, start the timed operation. In addition,
Since the switch SWP is closed, the relay coil Rp continues to be energized and the solenoid on-off valve SOL1 also continues to be energized, so that the center gas is continuously supplied to the nozzle member 1 at the flow rate F1 and the injection port of the nozzle member 1 is continued. The pilot arc between 2 and the electrode rod 3 also continues.
スイッチSWMの閉から開への切換わりからt1が経過す
ると、タイマT1がタイムオーバして接片T1cが閉じ、こ
れにより電磁開閉弁SOL2と流量調節弁AV2を通して、高
流量F2でセンターガスが供給されると共に、タイマT2が
スタートする。F1＋F2の流量でセンターガスがガス噴射
口２から噴射するので、ガス噴射口２におけるセンター
ガスの噴射速度が高くなり、センターガスの流量が多い
ことと流速が高いことにより、ガス噴射口２まわりおよ
び電極棒３先端部の付着物が噴射口２の外に吹飛ばされ
ると共に、パイロットアークがガス流により弧状に曲っ
てアーク長が延び、噴射口２まわりを周回移動又は動揺
移動し、これにより噴射口２周りの比較的に広い面積に
渡って、付着物が溶融して吹飛ばされる。When t 1 from switching of the closed switch SWM to open has elapsed, the timer T1 is timed over closed contact piece T1c, thereby through the solenoid valve SOL2 and flow control valve AV2, the center gas at a high flow rate F2 At the same time as the supply, the timer T2 starts. Since the center gas is injected from the gas injection port 2 at the flow rate of F1 + F2, the injection speed of the center gas at the gas injection port 2 is high, and the high center gas flow rate and the high flow velocity cause The deposits at the tip of the electrode rod 3 are blown out of the injection port 2 and the pilot arc is bent in an arc shape by the gas flow to extend the arc length, and the pilot arc moves around the injection port 2 or oscillates. The deposit is melted and blown off over a relatively large area around the mouth 2.
タイマT1がタイムオーバしてからt2が経過すると、タ
イマT2がタイムオーバして接片T2cを開く。これによ
り、リレーコイルR1およびタイマT1の通電が止まり、自
己保持接片R1cが開きかつ接片T1cが開いてタイマT2の通
電が止まり、電磁開閉弁SOL2の通電が止まって、高流量
F2のセンターガス供給が停止する。When t 2 elapses after the timer T1 times out, the timer T2 times out and the contact piece T2 c is opened. As a result, the relay coil R1 and the timer T1 are de-energized, the self-holding contact piece R1 c is opened and the contact piece T1 c is opened, the timer T2 is de-energized, and the solenoid on-off valve SOL2 is de-energized, and the high flow rate is reached.
F2 center gas supply is stopped.
以上のように、加工対象材５の加工を終了してスイッ
チSWMを開に戻すと、それからt1後にセンターガス流量
が溶接時の低流量F1からF1＋F2の高流量となり、それか
らt2後に低流量F1に戻る。t1は、トーチ10が加工対象材
５から外れた位置に移動するに要する時間、t2は、ガス
噴射口２まわりの付着物を外に吹飛ばす時間である。As described above, when the processing of the workpiece 5 is finished and the switch SWM is returned to the open state, the center gas flow rate becomes a high flow rate from the low flow rate F1 to F1 + F2 at the time of welding t 1 after that, and the low flow rate after t 2 Return to F1. t 1 is the time required for the torch 10 to move to a position away from the processing target material 5, and t 2 is the time for blowing off the deposit around the gas injection port 2.
パイロットスイッチSWPが開かれると、パイロット接
片Rpcが開いてこれによりパイロット電源４が遮断され
て、ノズル部材１と電極棒３の間のパイロットアークが
消滅し、かつ電磁開閉弁SOL1の通電が止まり、センター
ガスの噴射が停止する。When the pilot switch SWP is opened, the pilot contact piece Rpc is opened to shut off the pilot power source 4, the pilot arc between the nozzle member 1 and the electrode rod 3 is extinguished, and the solenoid opening / closing valve SOL1 is deenergized. , Center gas injection stops.
第２図に、パイロットスイッチSWPおよびメインスイ
ッチSWMの開閉およびそれに対応したアークの発生およ
びガス供給のタイミングを示す。FIG. 2 shows the timing of opening / closing the pilot switch SWP and the main switch SWM and the corresponding arc generation and gas supply.
亜鉛メッキ鋼板の溶接において、従来は延べ0.5〜1.0
時間の溶接毎にノズル部材１および電極棒３のクリーニ
ング又は交換を要したところ、本発明により、パイロッ
トアークおよびセンターガスの供給（F1）を継続したま
ま、溶接終了毎に３秒間、F2＝4l/minでセンターガスを
供給することにより、ノズル部材１および電極棒５のク
リーニング又は交換は、延べ1.0〜3.0時間毎に行なえば
よくなった。また、通常の軟鋼材の溶接の場合、従来は
2.0〜4.0時間毎にクリーニング又は交換を要したとこ
ろ、本発明により、パイロットアークおよびセンターガ
スの供給（F1）を継続したまま、溶接終了毎に３秒間、
F2＝4l/minでセンターガスを供給することにより、ノズ
ル部材１および電極棒５のクリーニング又は交換は、延
べ3.0〜7.5時間毎に行なえばよくなった。なお、溶接時
のセンターガス流量（F1）は一般的には0.3〜3.0l/min
であり、クリーニングのための付加流量（F2）は、１〜
20l/minとすればよい。In welding galvanized steel sheets, the conventional total is 0.5 to 1.0.
When cleaning or replacement of the nozzle member 1 and the electrode rod 3 was required every time welding, according to the present invention, F2 = 4l for 3 seconds each time welding was completed while continuing the supply of the pilot arc and the center gas (F1). By supplying the center gas at / min, cleaning or replacement of the nozzle member 1 and the electrode rod 5 should be performed every 1.0 to 3.0 hours in total. In addition, when welding ordinary mild steel,
When cleaning or replacement was required every 2.0 to 4.0 hours, according to the present invention, 3 seconds each time welding was completed with the pilot arc and the center gas supply (F1) continued.
By supplying the center gas at F2 = 4 l / min, cleaning or replacement of the nozzle member 1 and the electrode rod 5 should be performed every 3.0 to 7.5 hours in total. The center gas flow rate (F1) during welding is generally 0.3 to 3.0 l / min.
The additional flow rate (F2) for cleaning is 1 to
It should be 20 l / min.
以上の通り本発明によれば、プラズマトーチの使用を
終えたとき自動的にガス噴射口まわりの付着物が吹飛ば
されて、付着物の残留量が少なくなり、ガス噴射口まわ
りの目視点検や手作業によるクリーニング作業は、長期
間の使用毎に行なえばよい。また、手作業によるクリー
ニング作業において、付着物の残留量が少いので、作業
量が低減する。As described above, according to the present invention, when the use of the plasma torch is finished, the deposits around the gas injection port are automatically blown off, the residual amount of the deposits is reduced, and the visual inspection around the gas injection port and The manual cleaning work may be performed after each long-term use. Further, in the manual cleaning work, the amount of remaining adhered material is small, so the work amount is reduced.
第１図は、本発明を一態様で実施する装置構成を示す電
気回路図である。 第２図は、第１図に示すパイロットスイッチSWPおよび
メインスイッチSWMの開閉およびそれに対応したアーク
の発生およびガス供給のタイミングを示すタイムチャー
トである。 1:ノズル部材、2:ガス噴射口 3:電極棒、4:パイロット電源 5:加工対象物、6:メイン電源 Rpc:パイロット接片、Rmc1：メイン接片 SOL1〜SOL3:電磁開閉弁、AV1〜AV3:流量調節弁 20:制御回路、SWP:パイロットスイッチ SWM:メインスイッチFIG. 1 is an electric circuit diagram showing a device configuration for implementing the present invention in one aspect. FIG. 2 is a time chart showing the timing of opening / closing the pilot switch SWP and the main switch SWM shown in FIG. 1 and the corresponding arc generation and gas supply. 1: Nozzle member, 2: Gas injection port 3: Electrode rod, 4: Pilot power supply 5: Object to be processed, 6: Main power supply Rpc: Pilot contact piece, Rmc 1 : Main contact piece SOL1 to SOL3: Solenoid open / close valve, AV1 ~ AV3: Flow control valve 20: Control circuit, SWP: Pilot switch SWM: Main switch
Claims (1)
ノズル部材の内部にあって先端が前記ガス噴射口に対向
する電極棒，電極棒に通電する手段およびノズル部材に
ガスを供給する手段を有するプラズマトーチにおいて、 加工対象物に対する該プラズマトーチの使用の終了時
に、パイロットアークを維持するためにノズル部材への
ガス供給と電極棒への通電を継続し、使用終了時の加工
対象材の加工位置に対してプラズマトーチが非作用とな
る時間後に、パイロットアークがガス流により弧状に曲
って延びる流量に、前記ノズル部材へのガス供給流量を
高くして、高温，高速のガス流により前記ガス噴射口お
よび電極棒の付着物を吹飛ばすことを特徴とする、プラ
ズマトーチのクリーニング方法。1. A nozzle member having a gas injection port at its tip, an electrode rod inside the nozzle member whose tip faces the gas injection port, a means for energizing the electrode rod, and a means for supplying gas to the nozzle member. In a plasma torch having, at the end of use of the plasma torch for the object to be processed, gas supply to the nozzle member and energization to the electrode rod are continued to maintain the pilot arc, and the material to be processed at the end of use is After the time when the plasma torch does not act on the processing position, the flow rate of gas supplied to the nozzle member is increased to a flow rate at which the pilot arc bends in an arc shape by the gas flow, and the high temperature and high speed gas flow causes A method for cleaning a plasma torch, which comprises blowing off deposits on a gas injection port and an electrode rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2029182A JP2685952B2 (en) | 1990-02-08 | 1990-02-08 | Plasma torch cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2029182A JP2685952B2 (en) | 1990-02-08 | 1990-02-08 | Plasma torch cleaning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03234373A JPH03234373A (en) | 1991-10-18 |
| JP2685952B2 true JP2685952B2 (en) | 1997-12-08 |
Family
ID=12269069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2029182A Expired - Lifetime JP2685952B2 (en) | 1990-02-08 | 1990-02-08 | Plasma torch cleaning method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2685952B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003053548A (en) * | 2001-08-17 | 2003-02-26 | Koike Sanso Kogyo Co Ltd | Discharge regulator and processing equipment |
| US6777638B2 (en) * | 2002-11-14 | 2004-08-17 | The Esab Group, Inc. | Plasma arc torch and method of operation for reduced erosion of electrode and nozzle |
| JP5364631B2 (en) * | 2010-03-31 | 2013-12-11 | アイシン・エィ・ダブリュ株式会社 | Cleaning device and cleaning method for plasma arc welding torch |
| KR101173088B1 (en) * | 2011-02-24 | 2012-08-10 | (주) 엠에이케이 | Plasma Touch |
| JP6591247B2 (en) * | 2015-09-25 | 2019-10-16 | 株式会社ダイヘン | Plasma arc welding method and plasma arc welding apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5148640Y2 (en) * | 1971-07-08 | 1976-11-24 | ||
| JPS4930238A (en) * | 1972-07-20 | 1974-03-18 | ||
| JPS5137266A (en) * | 1974-09-25 | 1976-03-29 | Gen Corp | JIKOKUHYO JISOCHI |
| JPS59165779U (en) * | 1983-04-18 | 1984-11-07 | 古河鉱業株式会社 | Welding torch nozzle cleaning device |
-
1990
- 1990-02-08 JP JP2029182A patent/JP2685952B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03234373A (en) | 1991-10-18 |
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