JP2003112262A - Spacing member, electrode holder, and plasma torch using them - Google Patents
Spacing member, electrode holder, and plasma torch using themInfo
- Publication number
- JP2003112262A JP2003112262A JP2001307097A JP2001307097A JP2003112262A JP 2003112262 A JP2003112262 A JP 2003112262A JP 2001307097 A JP2001307097 A JP 2001307097A JP 2001307097 A JP2001307097 A JP 2001307097A JP 2003112262 A JP2003112262 A JP 2003112262A
- Authority
- JP
- Japan
- Prior art keywords
- plasma torch
- spacing member
- electrodes
- electrode holder
- ceramics
- 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.)
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- Arc Welding In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はプラズマ切断、プラ
ズマ溶接、プラズマ溶射、プラズマ加熱等において用い
るプラズマトーチに関し、特にプラズマトーチ内の電極
間を電気的に絶縁しながら電極間の距離を一定に保つ間
隔保持部材および前記機能に加え電極を保持する機能を
有する電極ホルダに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma torch used in plasma cutting, plasma welding, plasma spraying, plasma heating, and the like, and particularly maintains a constant distance between electrodes while electrically insulating the electrodes in the plasma torch. The present invention relates to a space holding member and an electrode holder having a function of holding an electrode in addition to the above function.
【０００２】[0002]
【従来の技術】図１にプラズマトーチ１の外観とその先
端部の縦断面を示す。インサートチップ３には、絶縁耐
火物製の間隔保持部材２が装入されており、間隔保持部
材２の中心軸部の穴をタングステン電極棒４が貫通して
いる。この間隔保持部材２により、タングステン電極棒
４は、インサートチップ３の中心軸位置に位置決めされ
ている。2. Description of the Related Art FIG. 1 shows an external view of a plasma torch 1 and a longitudinal section of its tip. A spacing member 2 made of an insulating refractory material is inserted in the insert tip 3, and a tungsten electrode rod 4 penetrates through a hole in a central shaft portion of the spacing member 2. The tungsten electrode rod 4 is positioned at the central axis position of the insert tip 3 by the spacing member 2.
【０００３】パイロットアークの着火手順を述べると、
先ず、タングステン電極棒４とインサートチップ３との
間にＡｒ等の作動ガスを流す。次に高周波発生器によ
り、タングステン電極棒４とインサートチップ３との間
に高周波電圧（３０００〜４０００Ｖ、１〜２ＭＨｚ）
を印加する。この印加と同時にパイロットアーク電源よ
り、タングステン電極棒４とインサートチップ３との間
にパイロット電流（ＤＣ１０〜２０Ａ）を印加する。タ
ングステン電極棒４の先端部より、高圧高周波による放
電（絶縁破壊）が発生し作動ガス（Ａｒ）がイオン化
し、パイロット電流によるパイロットアークが発生し、
作動ガスのモーメンタム（運動エネルギ）によって、イ
ンサートチップ３のノズルよりアークが放出される。プ
ラズマアーク電源よりタングステン電極棒４と被加工材
５との間にプラズマアーク電流を流すことにより、タン
グステン電極棒４と被加工材５との間にアークが生じ、
被加工材５に向けてインサートチップ３のノズルよりプ
ラズマが噴射する。The ignition procedure of the pilot arc will be described below.
First, a working gas such as Ar is flown between the tungsten electrode rod 4 and the insert tip 3. Next, with a high frequency generator, a high frequency voltage (3000 to 4000 V, 1 to 2 MHz) was applied between the tungsten electrode rod 4 and the insert tip 3.
Is applied. Simultaneously with this application, a pilot current (DC 10 to 20 A) is applied between the tungsten electrode rod 4 and the insert tip 3 from the pilot arc power source. From the tip of the tungsten electrode rod 4, discharge (insulation breakdown) due to high voltage and high frequency occurs, the working gas (Ar) is ionized, and a pilot arc due to a pilot current is generated.
Due to the momentum (kinetic energy) of the working gas, an arc is emitted from the nozzle of the insert tip 3. By passing a plasma arc current between the tungsten electrode rod 4 and the workpiece 5 from the plasma arc power source, an arc is generated between the tungsten electrode rod 4 and the workpiece 5,
Plasma is jetted from the nozzle of the insert tip 3 toward the workpiece 5.
【０００４】[0004]
【発明が解決しようとする課題】パイロットアークの着
火のために、上述のようにタングステン電極棒４とイン
サートチップ３との間に作動ガスを流し、タングステン
電極棒４とインサートチップ３との間に高周波電圧を印
加しこれと同時に、タングステン電極棒４とインサート
チップ３との間にパイロット電流を流すための電圧を印
加しても、アークがインサートチップ３の内部の間隔保
持部材２の下端面近傍の空間に発生したままインサート
チップ３のノズルからアークが出ないこと（ミス着火）
がある。この状態が継続するとインサートチップ３、間
隔保持部材２およびタングステン電極棒４がトーチ内部
で過熱し、間隔保持部材２が溶損し場合によってはイン
サートチップ３まで溶損することがある。一方で、間隔
保持部材２はインサートチップ３と接触しているため、
インサートチップ３を冷却する冷却水により間接的に冷
却される。このように間隔保持部材２は過熱と冷却の影
響を同時に受けるため、部材内に大きな熱勾配を生じて
破損することがある。ミス着火時ほどではないものの、
インサートチップ３のノズルよりプラズマが正常に噴射
する通常使用時においても間隔保持部材２は過熱と冷却
の影響を同時に受けるため、長期間の使用により破損す
ることがある。To ignite the pilot arc, a working gas is caused to flow between the tungsten electrode rod 4 and the insert tip 3 as described above, so that the tungsten electrode rod 4 and the insert tip 3 are ignited. Even if a high-frequency voltage is applied and at the same time, a voltage for flowing a pilot current between the tungsten electrode rod 4 and the insert tip 3 is applied, the arc is in the vicinity of the lower end surface of the spacing member 2 inside the insert tip 3. Arc from the nozzle of insert tip 3 as it is generated in the space of
There is. If this state continues, the insert tip 3, the spacing member 2 and the tungsten electrode rod 4 are overheated inside the torch, and the spacing member 2 may be melted and, in some cases, even the insert tip 3. On the other hand, since the spacing member 2 is in contact with the insert tip 3,
It is indirectly cooled by the cooling water that cools the insert chip 3. As described above, since the spacing member 2 is affected by overheating and cooling at the same time, it may be damaged due to a large thermal gradient in the members. Although not as bad as at the time of ignition,
Even during normal use in which plasma is normally ejected from the nozzle of the insert tip 3, the spacing member 2 is affected by overheating and cooling at the same time, and therefore may be damaged by long-term use.
【０００５】本発明の目的は、ミス着火時または通常使
用時においても溶損および破損しにくく使用寿命の長い
間隔保持部材および電極ホルダもしくはそれを用いるプ
ラズマトーチを提供することである。An object of the present invention is to provide an interval holding member and an electrode holder or a plasma torch using the same which are less likely to be melted and damaged even during misfire or during normal use and have a long service life.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に鋭意検討したところ、本願発明者は電気的絶縁性を有
し且つ耐熱衝撃性の優れたセラミックスで前記間隔保持
部材または電極ホルダを形成すると過熱と冷却の影響を
同時に受けても破損しにくいことを見出した。ここで耐
熱衝撃性は４００デルタＴ℃以上であることが好まし
い。[Means for Solving the Problems] As a result of intensive studies to achieve the above object, the inventors of the present invention formed the spacing member or the electrode holder from ceramics having electrical insulation and excellent thermal shock resistance. Then, it has been found that even if it is affected by overheating and cooling at the same time, it is not easily damaged. Here, the thermal shock resistance is preferably 400 delta T ° C. or higher.
【０００７】したがって本願第１の発明の間隔保持部材
は、プラズマトーチ内の電極間を電気的に絶縁しながら
電極間の距離を一定に保つ間隔保持部材であり、電気的
絶縁性を有し且つ耐熱衝撃性が４００デルタＴ℃以上の
セラミックスで形成することを特徴とする。Therefore, the spacing member according to the first invention of the present application is a spacing member that maintains a constant distance between the electrodes in the plasma torch while electrically insulating the electrodes in the plasma torch. It is characterized by being formed of ceramics having a thermal shock resistance of 400 delta T ° C or higher.
【０００８】本願第２の発明の電極ホルダは、プラズマ
トーチ内の電極間を電気的に絶縁しながら電極間の距離
を一定に保ち且つ電極を保持する電極ホルダであり、電
気的絶縁性を有し且つ耐熱衝撃性が４００デルタＴ℃以
上のセラミックスで形成することを特徴とする。The electrode holder according to the second invention of the present application is an electrode holder that maintains a constant distance between the electrodes while electrically insulating the electrodes in the plasma torch and holds the electrodes, and has an electrical insulation property. In addition, it is characterized by being formed of a ceramic having a thermal shock resistance of 400 delta T ° C. or higher.
【０００９】本願第３の発明のプラズマトーチは、プラ
ス電極とマイナス電極との間に電極間を電気的に絶縁し
ながら電極間の距離を一定に保つ間隔保持部材を有する
プラズマトーチであり、間隔保持部材を電気的絶縁性を
有し且つ耐熱衝撃性が４００デルタＴ℃以上のセラミッ
クスで形成することを特徴とする。The plasma torch of the third invention of the present application is a plasma torch having a space holding member between the positive electrode and the negative electrode for electrically insulating the electrodes and keeping the distance between the electrodes constant. It is characterized in that the holding member is made of ceramics having an electrical insulating property and a thermal shock resistance of 400 delta T ° C. or more.
【００１０】本願第４の発明のプラズマトーチは、プラ
ス電極とマイナス電極との間を電気的に絶縁しながら電
極間の距離を一定に保ち且つ電極を保持する電極ホルダ
を有するプラズマトーチであり、電極ホルダを電気的絶
縁性を有し且つ耐熱衝撃性が４００デルタＴ℃以上のセ
ラミックスで形成することを特徴とする。The plasma torch of the fourth invention of the present application is a plasma torch having an electrode holder for holding a constant distance between electrodes while electrically insulating the positive electrode and the negative electrode from each other, It is characterized in that the electrode holder is made of ceramics having an electrical insulation property and a thermal shock resistance of 400 delta T ° C. or more.
【００１１】上記の特性を満たすセラミックスとしては
窒化ケイ素系セラミックスが好適であり、具体的には窒
化ケイ素やサイアロンを使用することができる。また、
一部のジルコニアも使用することができる。Silicon nitride ceramics are suitable as ceramics satisfying the above characteristics, and specifically, silicon nitride or sialon can be used. Also,
Some zirconia can also be used.
【００１２】[0012]
【発明の実施の形態】本発明の実施の形態を図面を参照
して説明する。図１はプラズマトーチ１の外観とその先
端部の縦断面を示す。各部の機能および動作については
既に説明したので、ここでは説明を省略する。間隔保持
部材２は、タングステン電極棒４とインサートチップ３
とを電気的に絶縁しながら電極間の距離を一定に保つ間
隔保持部材であり、電気的絶縁性を有し且つ耐熱衝撃性
が４００デルタＴ℃以上のセラミックス、例えば日立金
属社製サイアロンＨＣＮ−１０で形成する。このサイア
ロンは電気抵抗率１０１１Ω・ｃｍ以上、耐熱衝撃性７
１０デルタＴ℃の特性を有する。この間隔保持部材２を
装入した図１のプラズマトーチ１を用いてプラズマの噴
射実験を行ったところ、本発明の間隔保持部材は、従来
の絶縁耐火物製の間隔保持部材よりミス着火時および通
常使用時においても溶損および破損しにくく、使用寿命
は２０倍以上に延びた。他に日立金属社製ジルコニアＨ
ＣＺ−４０で形成しても同様の効果を得ることができ
る。本材料は電気抵抗率１０１０Ω・ｃｍ以上、耐熱衝
撃性４３０デルタＴ℃の特性を有する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an external view of a plasma torch 1 and a vertical cross section of its tip. Since the function and operation of each unit have already been described, the description thereof will be omitted here. The spacing member 2 includes a tungsten electrode rod 4 and an insert tip 3
Is a spacing member that keeps a constant distance between electrodes while electrically insulating and, and has electrical insulation and thermal shock resistance of 400 delta T ° C. or higher, for example, Hitachi Metals' Sialon HCN- It is formed by 10. This sialon has an electrical resistivity of 10 11 Ω · cm or more and a thermal shock resistance of 7
It has a characteristic of 10 delta T ° C. When a plasma injection test was performed using the plasma torch 1 of FIG. 1 in which the spacing member 2 was inserted, the spacing member of the present invention showed that the spacing member of the present invention was more misfired than the conventional spacing member made of an insulating refractory material. Even during normal use, it is less likely to melt and break, and the service life is extended 20 times or more. Zirconia H manufactured by Hitachi Metals
The same effect can be obtained by using CZ-40. This material has characteristics of electrical resistance of 10 10 Ω · cm or more and thermal shock resistance of 430 Delta T ° C.
【００１３】上記サイアロンに代えてアルミナ（耐熱衝
撃性２１０デルタＴ℃）で作製した間隔保持部材を装入
した図１のプラズマトーチ１を用いてプラズマの噴射実
験を行ったところ、溶損および破損しやすく使用寿命は
従来の絶縁耐火物製の間隔保持部材と同等であった。A plasma injection experiment was carried out using the plasma torch 1 of FIG. 1 in which a spacing member made of alumina (heat shock resistance 210 Delta T ° C.) was inserted in place of the sialon, and melting loss and damage were found. It was easy to use and had a service life equivalent to that of the conventional spacing member made of insulating refractory material.
【００１４】このプラズマの噴射実験で本発明の間隔保
持部材は摩耗が少ないことも明らかになった。作動ガス
は高速度で間隔保持部材２の孔を通過するが、その際に
作動ガスの中に微量でも塵埃が含まれていると間隔保持
部材２を摩耗させることがある。作動ガスはパイロット
アークのミス着火を防ぐために、間隔保持部材２に設け
た孔により旋回流となってタングステン電極棒４とイン
サートチップ３との間に供給されることがある。作動ガ
ス中の塵埃で間隔保持部材２が摩耗して、この孔の形状
が変化すると旋回流に乱れが生じる。磨耗を防ぐには間
隔保持部材２をスラリー摩耗による耐磨耗性が摩耗体積
５ｍｍ３以下のセラミックスで形成することが好まし
い。この摩耗体積の定義は４００♯ダイヤ研削した１５
ｍｍ×１５ｍｍ×５ｔの試験片を１５ｍｍ×１５ｍｍの
面を周方向に向けて、Ａｌ２Ｏ３粉末（６０mesh）中、
周速７ｍ／ｓで１ｈ回転させた時の体積の減少量であ
る。サイアロンＨＣＮ−１０の摩耗体積は１．４ｍ
ｍ３、ジルコニアＨＣＺ−４０の摩耗体積は０．８ｍｍ
３である。In this plasma injection experiment, it was also revealed that the spacing member of the present invention has little wear. The working gas passes through the holes of the spacing member 2 at a high speed, but if the working gas contains a small amount of dust, the spacing member 2 may be worn. The working gas may be supplied between the tungsten electrode rod 4 and the insert tip 3 as a swirling flow due to the holes provided in the spacing member 2 in order to prevent misfiring of the pilot arc. If the spacing member 2 is worn by dust in the working gas and the shape of the holes changes, the swirling flow is disturbed. In order to prevent abrasion, it is preferable that the spacing member 2 is made of ceramics having abrasion resistance of 5 mm 3 or less due to abrasion of slurry. The definition of this wear volume is 15 with 400 # diamond grinding.
A test piece of 15 mm × 15 mm × 5 t was placed in Al 2 O 3 powder (60 mesh) with the surface of 15 mm × 15 mm facing in the circumferential direction.
It is the amount of reduction in volume when rotated for 1 h at a peripheral speed of 7 m / s. Wear volume of Sialon HCN-10 is 1.4m
m 3 , wear volume of zirconia HCZ-40 is 0.8 mm
It is 3 .
【００１５】図２は別のプラズマトーチ１０の縦断面の
模式図を示す。図２では図１のプラズマトーチ１の部位
に相当する部位には同じ符号を付し、シールドガスと冷
却水を流すための構成は図示を省略した。プラズマトー
チ１０は、タングステン電極棒４とインサートチップ３
とを電気的に絶縁しながら電極間の距離を一定に保ち且
つ電極（タングステン電極棒４とインサートチップ３）
を保持する電極ホルダ６を有するプラズマトーチであ
り、電極ホルダ６を電気的絶縁性を有し且つ耐熱衝撃性
が４００デルタＴ℃以上のセラミックスで形成する。こ
のようなセラミックスとして前記の間隔保持部材を形成
するセラミックスと同様のものを採用することができ
る。FIG. 2 is a schematic view of a vertical cross section of another plasma torch 10. In FIG. 2, parts corresponding to the parts of the plasma torch 1 of FIG. 1 are denoted by the same reference numerals, and the structure for flowing the shield gas and the cooling water is omitted. The plasma torch 10 includes a tungsten electrode rod 4 and an insert tip 3
Maintains a constant distance between electrodes while electrically insulating the electrodes and electrodes (tungsten electrode rod 4 and insert tip 3)
Is a plasma torch having an electrode holder 6 for holding the electrode holder, and the electrode holder 6 is made of ceramics having electrical insulation and thermal shock resistance of 400 delta T ° C. or more. As such ceramics, the same ceramics as those forming the spacing member can be adopted.
【００１６】本発明の間隔保持部材や電極ホルダの作製
方法について説明する。間隔保持部材や電極ホルダの外
周面や内周面の寸法は、ある程度の加工精度を必要とす
る。先ず、原料となる粉末をラバープレスで成形してグ
リーンと呼ばれる成形体を得る。次いでグリーンを加工
してできるだけ仕上げ寸法に近い焼結体が得られるよう
な寸法にする。これを焼結し焼結体の必要箇所を加工し
て仕上げ寸法とする。このようにして難加工性材料であ
るセラミックスの加工代を少なくすることができる。A method of manufacturing the spacing member and the electrode holder of the present invention will be described. The dimensions of the outer peripheral surface and the inner peripheral surface of the spacing member and the electrode holder require a certain degree of processing accuracy. First, powder as a raw material is molded by a rubber press to obtain a molded body called a green. Then, the green is processed into a size such that a sintered body as close to the finished size as possible is obtained. This is sintered and the required parts of the sintered body are processed to obtain the finished dimensions. In this way, it is possible to reduce the machining allowance of the difficult-to-machine material ceramics.
【００１７】本発明を移行型プラズマトーチの例を用い
て説明したが、本発明は非移行型プラズマトーチにも適
用できる。Although the present invention has been described using the example of a transfer type plasma torch, the present invention can be applied to a non-transfer type plasma torch.
【００１８】[0018]
【発明の効果】本発明は上記した構成としたから、ミス
着火時または通常使用時においても溶損および破損しに
くく使用寿命の長い間隔保持部材、電極ホルダ及びそれ
を用いるプラズマトーチを提供することができる。EFFECTS OF THE INVENTION Since the present invention has the above-described structure, it is possible to provide an interval holding member, an electrode holder, and a plasma torch using the same which are less likely to be melted and damaged even during misfire or during normal use. You can
【図１】本発明に係わるプラズマトーチの要部を示した
縦断面図である。FIG. 1 is a vertical sectional view showing a main part of a plasma torch according to the present invention.
【図２】本発明に係わる別のプラズマトーチの要部を示
した縦断面図である。FIG. 2 is a vertical cross-sectional view showing a main part of another plasma torch according to the present invention.
１，１０ プラズマトーチ ３ インサートチップ ２ 間隔保持部材 ４ 電極棒 ５ 被加工材 ６ 電極ホルダ 1,10 Plasma torch 3 insert tip 2 spacing member 4 electrode rod 5 Work material 6 electrode holder
Claims (7)
縁しながら電極間の距離を一定に保つ間隔保持部材であ
り、電気的絶縁性を有し且つ耐熱衝撃性が４００デルタ
Ｔ℃以上のセラミックスで形成することを特徴とする間
隔保持部材。1. A spacing member for maintaining a constant distance between electrodes while electrically insulating between electrodes in a plasma torch, having electrical insulation and thermal shock resistance of 400 Delta T ° C. or more. A spacing member characterized by being formed of ceramics.
ックスである請求項１に記載の間隔保持部材。2. The spacing member according to claim 1, wherein the ceramic is silicon nitride ceramics.
縁しながら電極間の距離を一定に保ち且つ電極を保持す
る電極ホルダであり、電気的絶縁性を有し且つ耐熱衝撃
性が４００デルタＴ℃以上のセラミックスで形成するこ
とを特徴とする電極ホルダ。3. An electrode holder for electrically insulating between electrodes in a plasma torch while maintaining a constant distance between the electrodes and holding the electrodes. The electrode holder has electrical insulation and thermal shock resistance of 400 Delta. An electrode holder characterized by being formed of ceramics having a temperature of T ° C. or higher.
ックスである請求項３に記載の電極ホルダ。4. The electrode holder according to claim 3, wherein the ceramic is silicon nitride ceramics.
間を電気的に絶縁しながら電極間の距離を一定に保つ間
隔保持部材を有するプラズマトーチであり、間隔保持部
材を電気的絶縁性を有し且つ耐熱衝撃性が４００デルタ
Ｔ℃以上のセラミックスで形成することを特徴とするプ
ラズマトーチ。5. A plasma torch having a space holding member for electrically insulating the space between the positive electrode and the negative electrode while maintaining a constant distance between the electrodes, wherein the space holding member is electrically insulated. A plasma torch, which is made of a ceramic having a thermal shock resistance of 400 Delta T ° C. or higher.
的に絶縁しながら電極間の距離を一定に保ち且つ電極を
保持する電極ホルダを有するプラズマトーチであり、電
極ホルダを電気的絶縁性を有し且つ耐熱衝撃性が４００
デルタＴ℃以上のセラミックスで形成することを特徴と
するプラズマトーチ。6. A plasma torch having an electrode holder for maintaining a constant distance between the electrodes and electrically holding the electrodes while electrically insulating the positive electrode and the negative electrode from each other. Has and thermal shock resistance of 400
A plasma torch characterized by being formed of ceramics having a delta T ° C. or higher.
ックスである請求項５又は６に記載のプラズマトーチ。7. The plasma torch according to claim 5, wherein the ceramic is silicon nitride ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001307097A JP2003112262A (en) | 2001-10-03 | 2001-10-03 | Spacing member, electrode holder, and plasma torch using them |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001307097A JP2003112262A (en) | 2001-10-03 | 2001-10-03 | Spacing member, electrode holder, and plasma torch using them |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003112262A true JP2003112262A (en) | 2003-04-15 |
Family
ID=19126621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001307097A Pending JP2003112262A (en) | 2001-10-03 | 2001-10-03 | Spacing member, electrode holder, and plasma torch using them |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003112262A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140018250A (en) * | 2011-02-25 | 2014-02-12 | 히다치 겡키 가부시키 가이샤 | Construction machine |
| JP2016107307A (en) * | 2014-12-08 | 2016-06-20 | 大陽日酸株式会社 | Welding equipment and plasma welding method |
| US10131013B2 (en) | 2014-03-19 | 2018-11-20 | Taiyo Nippon Sanso Corporation | Non-transferred plasma arc system, conversion adapter kit, and non-transferred plasma arc torch |
-
2001
- 2001-10-03 JP JP2001307097A patent/JP2003112262A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140018250A (en) * | 2011-02-25 | 2014-02-12 | 히다치 겡키 가부시키 가이샤 | Construction machine |
| KR101885233B1 (en) | 2011-02-25 | 2018-08-03 | 히다치 겡키 가부시키 가이샤 | Construction machine |
| US10131013B2 (en) | 2014-03-19 | 2018-11-20 | Taiyo Nippon Sanso Corporation | Non-transferred plasma arc system, conversion adapter kit, and non-transferred plasma arc torch |
| JP2016107307A (en) * | 2014-12-08 | 2016-06-20 | 大陽日酸株式会社 | Welding equipment and plasma welding method |
| US10610954B2 (en) | 2014-12-08 | 2020-04-07 | Taiyo Nippon Sanso Corporation | Welding apparatus and plasma welding method |
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