JPH03297564A - Pulse arc welding machine - Google Patents
Pulse arc welding machineInfo
- Publication number
- JPH03297564A JPH03297564A JP9775490A JP9775490A JPH03297564A JP H03297564 A JPH03297564 A JP H03297564A JP 9775490 A JP9775490 A JP 9775490A JP 9775490 A JP9775490 A JP 9775490A JP H03297564 A JPH03297564 A JP H03297564A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- welding
- outputs
- constant current
- arc
- 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.)
- Granted
Links
- 238000003466 welding Methods 0.000 title claims abstract description 76
- 239000010953 base metal Substances 0.000 claims abstract description 8
- 230000007704 transition Effects 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241000282472 Canis lupus familiaris Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業−１−の利用分野）
本発明は消耗電極である溶接用ワイヤを自動送給してパ
ルスアーク溶接を行う溶接用電源に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Application in Industry-1-) The present invention relates to a welding power source that performs pulse arc welding by automatically feeding a welding wire, which is a consumable electrode.
（従来の技術）
パルスアーク溶接機の従来の技術は、アークスター１〜
時において、アークの状態に関係なくパルスピークとパ
ルスベースを交互に繰り返し出力するパルス波形出力を
行って溶接を開始していた。(Conventional technology) The conventional technology of pulse arc welding machines is Arcstar 1~
At the time, welding was started by outputting a pulse waveform that alternately outputs a pulse peak and a pulse base regardless of the state of the arc.
（発明が解決しようとする課題）
従来のパルスアーク溶接機はＲｆ述のように、溶接開始
直後のアークの状態に関係なく所定のパルス出力を行っ
ていたが、アーク発生直後のアークは不安定な状態で、
維持が難しく時として長いアーク長となってしまうが、
この状態においてベース電流出力となると電流値の不足
によるアークの消滅が発生し、アーク切れとなり、引き
続き行なわれるワイヤの送給によって母材に短絡したワ
イヤは、パルス電流の強力なピンチ力によって多大なス
パッタの飛散をともない、短絡解除が行なわれ、そのス
パッタは被溶接部周辺に付着し、被溶接物の品質を著し
くそこなっていた。(Problem to be solved by the invention) As mentioned in Rf, conventional pulse arc welding machines output a predetermined pulse regardless of the state of the arc immediately after starting welding, but the arc immediately after arc generation is unstable. In a state of
Although it is difficult to maintain and sometimes results in a long arc length,
In this state, when the base current is output, the arc disappears due to insufficient current, the arc breaks, and the wire that is short-circuited to the base metal due to the subsequent feeding of the wire is severely pinched by the strong pinching force of the pulse current. The short circuit was released with the scattering of spatter, and the spatter adhered to the periphery of the welded part, significantly deteriorating the quality of the welded part.
本発明は、このような従来技術による問題点に対し、溶
接開始時にアーク切れにより発生するスパッタを抑制し
、良好なアークスタートが行なえるパルスアーク溶接機
を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems with the prior art and to provide a pulse arc welding machine that suppresses spatter caused by arc breakage at the start of welding and can perform a good arc start.
（課題を解決するための手段）
前記課題を解決するため、消耗電極である溶接用ワイヤ
が被溶接物である母材に、接触短絡と非接触でアーク発
生とを交互に繰り返しながら行なわれる短絡移行溶接の
出力電流波形を指示する第１−信号を出力する短絡移行
溶接指示部と、溶接用ワイヤが接触短絡を起こさず常に
アーク発生の状態となるようパルス状の出力電流波形を
指示する第２信号を出力するパルス溶接指示部と、溶接
開始後のアーク発生により計時を始め、所定の時限が経
過するまでは第１のレベルとなり、所定の時限が経過す
ると第２のレベルとなるタイマー信号を出力するタイマ
ーと、前記第］−信号と前記第２信号を入力とし、前記
タイマー信号を切換信号として受け、前記第１信号か前
記第２信号のいずれかを第３信号として出力する切換素
子部と、前記第３信号を入力として溶接出力制御素子を
駆動する駆動信号を出力する駆動回路部を備えてなるも
のである。(Means for Solving the Problems) In order to solve the above problems, a welding wire, which is a consumable electrode, is short-circuited to a base metal, which is a workpiece, by alternately repeating contact short-circuiting and non-contact arc generation. A short-circuit transition welding instruction section that outputs a first signal that instructs the output current waveform of transition welding, and a second section that instructs a pulsed output current waveform so that the welding wire is always in an arc generation state without causing a contact short circuit. A pulse welding instruction section that outputs two signals, and a timer signal that starts timing when an arc occurs after welding starts, remains at the first level until a predetermined time period has elapsed, and becomes the second level when the predetermined time period has elapsed. a switching element that receives the timer signal as a switching signal, receives the timer signal as a switching signal, and outputs either the first signal or the second signal as a third signal; and a drive circuit section that receives the third signal and outputs a drive signal for driving the welding output control element.
−
（作 用）
上記構成により、溶接開始のアーク発生より所定の時限
内は前記アーク短絡判定信号により定電流軌跡部と定電
圧部と交互に繰り返す短絡移行溶接電流波形出力指示を
行い、所定の時限後は所定のクロック入力に従った周期
で高域定電流部と低域定電流部を交互に繰り返すパルス
溶接電流波形出力指示を出力する作用を行う。- (Function) With the above configuration, within a predetermined time period from the occurrence of an arc at the start of welding, the short circuit transition welding current waveform output is instructed to alternately repeat the constant current locus section and the constant voltage section by the arc short circuit judgment signal, and the After the time limit, a pulse welding current waveform output instruction is output which alternately repeats a high range constant current section and a low range constant current section at a period according to a predetermined clock input.
（実施例） 第１図は本発明の１実施例のブロック図である。(Example) FIG. 1 is a block diagram of one embodiment of the present invention.
］−は短絡移行溶接指示部、２はパルス溶接指示部、３
は切換素子部、４はタイマー、５は駆動回路部、６は溶
接出力制御素子、Ｓｌは第」−信号、Ｓ２は第２信号、
Ｓ３は第３信号、ＳＴはタイマー信号、ＤＳは駆動信号
を示す。次に各部の具体的な動作説明を行う。]- is a short-circuit transition welding instruction section, 2 is a pulse welding instruction section, 3
1 is a switching element section, 4 is a timer, 5 is a drive circuit section, 6 is a welding output control element, SL is a 1st signal, S2 is a 2nd signal,
S3 represents a third signal, ST represents a timer signal, and DS represents a drive signal. Next, a detailed explanation of the operation of each part will be given.
溶接開始より所定の時限内はタイマー４よりタイマー信
号ＳＴが第１のレベルとしてローレベル出力されており
切換素子部３は、溶接用ワイヤが母材と接触短絡ないし
アーク発生を交互に繰り返しながら行なわれる短絡移行
溶接となるような電流波形を指示する短絡移行溶接指示
部１より出力される第１− （ｒｊ″；′ｒＳ１を選択
して第３信号Ｓ３として駆動回路部５へ出力する。Within a predetermined time period from the start of welding, the timer signal ST is outputted from the timer 4 at a low level as the first level, and the switching element section 3 alternately repeats the welding wire contacting the base metal and causing a short circuit or arc generation. The first -(rj'';'rS1) output from the short-circuit transition welding instructing section 1, which instructs a current waveform that will result in short-circuit transition welding, is selected and output to the drive circuit section 5 as a third signal S3.
溶接開始後所定の時限が経過するとタイマー４が動作し
タイマー信号ＳＴを第１のレベルであるローレベルより
第２のレベルであるハイレベルに変化する。When a predetermined time period elapses after the start of welding, the timer 4 operates and changes the timer signal ST from the first low level to the second high level.
これに従い切換素子部３は、常にアーク発生状態である
スプレー移行溶接を行うためのパルス型電流波形を指示
するパルス溶接指示部２より出力される第２信号Ｓ２を
選択して第３信号Ｓ３として駆動回路部５へ出力する。Accordingly, the switching element section 3 selects the second signal S2 outputted from the pulse welding instruction section 2, which instructs the pulsed current waveform for performing spray transfer welding in which an arc is always generated, as the third signal S3. Output to the drive circuit section 5.
以」二の動作により溶接開始より所定の時限は短絡移行
の溶接出力を行い、所定の時限後はスプレー移行の溶接
出力を行うことができる。By the above two operations, welding output for short circuit transition can be performed for a predetermined time period from the start of welding, and welding output for spray transition can be performed after the predetermined time limit.
第２踵１に、第１図で示した短絡移行溶接指示部」の−
実施例のブロック図を示す。On the second heel 1, the short circuit transition welding instruction part shown in FIG.
A block diagram of an embodiment is shown.
１１は定電流軌跡指示部、１２は定電圧指示部、１３は
第１切換素子部、１４はアーク短絡判定回路部、Ｉｓは
定電流軌跡信号、工ａは定電圧信号、Ａ、 Ｓはアーク
短絡判定信号、Ｓｌは第１信号を示す。11 is a constant current trajectory indicating section, 12 is a constant voltage indicating section, 13 is a first switching element section, 14 is an arc short circuit determination circuit section, Is is a constant current trajectory signal, a is a constant voltage signal, A and S are arcs. A short circuit determination signal, Sl indicates a first signal.
次に各部の詳細な説明を行う。Next, each part will be explained in detail.
定電流軌跡指示部１１は、パルス電流の立ち」二かり速
度より速くない所定の軌跡に従って溶接出力電流波形を
指示する定電流軌跡信号Ｉｓを出力し、定電圧指示部は
アーク出力電圧が所定の定電圧となるような導通角を与
える定電圧信号Ｉａを出力する。The constant current trajectory instruction section 11 outputs a constant current trajectory signal Is that instructs the welding output current waveform according to a predetermined trajectory that is not faster than the rising speed of the pulse current, and the constant voltage instruction section outputs a constant current trajectory signal Is that indicates the welding output current waveform according to a predetermined trajectory that is not faster than the rising speed of the pulse current. A constant voltage signal Ia is output that provides a conduction angle that provides a constant voltage.
アーク短絡判定回路部１４ては、溶接出力電流及び電圧
を元にして溶接用ワイヤと母材とがアーク発生中である
か接触短絡中であるかを判定し、アーク短絡判定信号Ａ
、 Ｓとして第１−切換素子部１３へ出力する。The arc short circuit determination circuit unit 14 determines whether an arc is occurring or a contact short circuit is occurring between the welding wire and the base metal based on the welding output current and voltage, and generates an arc short circuit determination signal A.
, S to the first switching element section 13.
第１切換素子部１３は前記アーク短絡判定信号ＡＳを切
換信号人力としてアーク発生時は定電圧信号Ｉａを、接
触短絡時は定電流軌跡信号ＩＳを第１信号Ｓ１−とじて
出力する。The first switching element section 13 uses the arc short circuit determination signal AS as a switching signal and outputs a constant voltage signal Ia when an arc occurs, and a constant current trajectory signal IS as a first signal S1- when a contact short circuit occurs.
第３［ソ］に第］−１ＳＩ＋で示したパルス溶接指示部
２の一実施例のブロック図を示す。A block diagram of an embodiment of the pulse welding instruction section 2 indicated by 1-1SI+ is shown in 3rd [S].
２１ば高域定電流指示部、２２は低域定電流指示部、２
３は第２切換素子部、Ｉｐは高域定電流信号、Ｉ、は低
域定電流信号、ＣＬＫはクロック１、Ｓ２は第２信号を
示す。21 is a high range constant current instruction section, 22 is a low range constant current instruction section, 2
3 is a second switching element section, Ip is a high range constant current signal, I is a low range constant current signal, CLK is a clock 1, and S2 is a second signal.
次に各部の詳細な説明を行う。Next, each part will be explained in detail.
高域定電流指示部２１はパルス溶接におけるパルスピー
ク電流値を指示する高域定電流信号Ｉｐを出力し、低域
定電流指示部２２はパルス溶接におけるベース電流値を
指示する低域定電流信号■６を出力する。The high range constant current instruction section 21 outputs a high range constant current signal Ip that indicates the pulse peak current value in pulse welding, and the low range constant current instruction section 22 outputs a low range constant current signal that indicates the base current value in pulse welding. ■Output 6.
第２切換素子部２３は所定の周期で与えられるクロック
ＩＣＬＫを入力として高域定電流信号ＩＰと低域定電流
信号■８を交互に第２信号Ｓ２として出力する。The second switching element section 23 receives the clock ICLK given at a predetermined cycle and alternately outputs the high range constant current signal IP and the low range constant current signal 8 as the second signal S2.
第４図に各信号のタイミングチャートを示す。FIG. 4 shows a timing chart of each signal.
アーク短絡判定信号ＡＳによって定電流軌跡信号Ｉｓと
定電圧信号Ｉａの波形が合成されて第１−信号Ｓ１とな
り、クロック１− ＣＬ Ｋによって高域定電流信号（
ｐと低域定電流信号■。の波形が合成されて第２信号Ｓ
２となり、第１信号Ｓ１と第２信号Ｓ２はタイマー信号
ＳＴによって切換えられて第３信号Ｓ３となり駆動回路
部へ出力される。駆動回路部で第３信号Ｓ３は駆動信号
ＤＳに交換され溶接出力制御素子を駆動して溶接出力電
流Ｉ ＯＩＪ ｔを出力し、溶接を行う。The waveforms of the constant current trajectory signal Is and the constant voltage signal Ia are synthesized by the arc short circuit determination signal AS to become the first signal S1, and the high range constant current signal (
p and low range constant current signal■. The waveforms of are synthesized and the second signal S
2, the first signal S1 and the second signal S2 are switched by the timer signal ST to become a third signal S3 and output to the drive circuit section. In the drive circuit section, the third signal S3 is exchanged with the drive signal DS to drive the welding output control element to output the welding output current I OIJ t to perform welding.
（発明の効果）
以上のような手段、作用、実施例によれば、パルスアー
ク溶接機によるパルス溶接において、溶接開始よりパル
ス出力を始めた時のアーク不安定によるアーク切れやス
パッタ発生などの不良に対し、アーク発生直後のアーク
不安定時に溶接用ワイヤと母材が接触短絡してもアーク
切れや巨大スパッタの発生を抑制でき、良好なアークス
ター１へが実現可能となり、本発明の産業界に及ぼす貢
献は犬である。(Effects of the Invention) According to the above means, effects, and embodiments, defects such as arc breakage and spatter generation due to arc instability when pulse output is started from the start of welding in pulse welding using a pulse arc welding machine can be avoided. On the other hand, even if the welding wire and the base metal contact and short-circuit when the arc is unstable immediately after arc generation, arc breakage and generation of giant spatter can be suppressed, and a good arc star 1 can be realized. The contribution that dogs make to the.
第１図は本発明の溶接出力指令の一実施例を示すブロッ
ク図、第２図は、第１図中の短絡移行溶接指示部内部の
一実施例を示すブロック図、第３図は、第１図中のパル
ス溶接指示部内部の−実施例を示すブロック図、第４図
は各信号のタイミングを示すタイミングチャートである
。
１−・・短絡移行溶接指示部、 ２・・・パルス溶接指
示部、 ３・・切換素子部、 ４・・・タイマー、 ５
・・・駆動回路部、 ６・溶接出力制御素子、 １１・
・・定電流軌跡指示部、 １２・定電圧指示部、 １３
・・・第１切換素子部、 ２１・・・高域定電流指示部
、２２・低域定電流指示部、 ２３・・・第２切換素子
部。FIG. 1 is a block diagram showing an embodiment of the welding output command of the present invention, FIG. 2 is a block diagram showing an embodiment of the inside of the short-circuit transition welding instruction section in FIG. 1, and FIG. FIG. 4 is a block diagram showing an embodiment of the inside of the pulse welding instruction section in FIG. 1, and FIG. 4 is a timing chart showing the timing of each signal. DESCRIPTION OF SYMBOLS 1--Short circuit transition welding instruction section, 2...Pulse welding instruction section, 3.Switching element section, 4.Timer, 5
... Drive circuit section, 6. Welding output control element, 11.
・・Constant current trajectory instruction section, 12・Constant voltage instruction section, 13
...first switching element section, 21.. high range constant current instruction section, 22.. low range constant current instruction section, 23.. second switching element section.
Claims (3)
材に接触短絡と非接触でアーク発生とを交互に繰り返し
ながら行なわれる短絡移行溶接の出力電流波形を指示す
る第１信号を出力する短絡移行溶接指示部と、 溶接用ワイヤが接触短絡を起こさず常にアーク発生の状
態となるようパルス状の出力電流波形を指示する第２信
号を出力するパルス溶接指示部と、溶接開始後のアーク
発生により計時を始め、所定の時限が経過するまでは第
１のレベルとなり、所定の時限が経過すると第２のレベ
ルとなるタイマー信号を出力するタイマーと、 前記第１信号と前記第２信号を入力とし、前記タイマー
信号を切換信号として受け、前記第１信号か前記第２信
号のいずれかを第３信号として出力する切換素子部と、 前記第３信号を入力として溶接出力制御素子を駆動する
駆動信号を出力する駆動回路部と、を備えてもつことを
特徴とするパルスアーク溶接機。(1) The welding wire, which is a consumable electrode, outputs a first signal that instructs the output current waveform of short-circuit transition welding, which is performed while alternately repeating contact short-circuiting and non-contact arc generation to the base metal, which is the workpiece. a pulse welding instruction section that outputs a second signal that instructs a pulsed output current waveform so that the welding wire does not cause a contact short circuit and is always in a state of arc generation; a timer that outputs a timer signal that starts measuring when an arc occurs, remains at a first level until a predetermined time period elapses, and becomes a second level when the predetermined time period elapses; and the first signal and the second signal. a switching element section that receives the timer signal as an input, receives the timer signal as a switching signal, and outputs either the first signal or the second signal as a third signal; and the third signal is used as an input to drive a welding output control element. 1. A pulse arc welding machine comprising: a drive circuit section that outputs a drive signal to generate a pulse arc welding machine.
イヤが被溶接物である母材に接触短絡しているか非接触
でアーク発生中であるかを判定してアーク短絡判定信号
を出力するアーク短絡判定回路部と、 パルス電流の立ち上がり速度より速くない所定の軌跡に
従って定電流軌跡信号を出力する定電流軌跡指示部と、 アーク出力電圧が所定の定電圧となるような導通角を与
える定電圧信号を出力する定電圧指示部と、 前記定電流軌跡信号と、前記定電圧信号を入力とし、前
記アーク短絡判定信号を切換信号として受け、前記定電
流軌跡信号か前記定電圧信号のいずれかを第１信号とし
て出力する第１切換素子部と、 から成ることを特徴とする請求項（１）記載のパルスア
ーク溶接機。(2) The short-circuit transition welding instruction unit determines whether the welding wire, which is a consumable electrode, is in contact with the base metal, which is the object to be welded, or if an arc is being generated without contact, and outputs an arc short-circuit determination signal. a constant current trajectory indicator that outputs a constant current trajectory signal according to a predetermined trajectory that is not faster than the rising speed of the pulse current; and a constant current trajectory indicator that provides a conduction angle such that the arc output voltage becomes a predetermined constant voltage. a constant voltage instruction section that outputs a constant voltage signal; the constant current trajectory signal and the constant voltage signal are input, the arc short circuit determination signal is received as a switching signal, and either the constant current trajectory signal or the constant voltage signal is input; The pulse arc welding machine according to claim 1, further comprising: a first switching element section that outputs the signal as the first signal.
高域定電流信号を出力する高域定電流指示部と、 所定の低電流値を指示する低域定電流信号を出力する低
域定電流指示部と、 前記高域定電流信号と、前記低域定電流信号を入力とし
、所定のクロック１を切換信号として受け、前記高域定
電流信号か前記低域定電流信号のいずれかを第２信号と
して出力する第２切換素子部とから成ることを特徴とす
る請求項（１）記載のパルスアーク溶接機。(3) The pulse welding instruction section includes a high range constant current instruction section that outputs a high range constant current signal that indicates a predetermined high current value, and a low range constant current instruction section that outputs a low range constant current signal that indicates a predetermined low current value. a range constant current instruction section, which receives the high range constant current signal and the low range constant current signal as input, receives a predetermined clock 1 as a switching signal, and selects either the high range constant current signal or the low range constant current signal. 2. The pulse arc welding machine according to claim 1, further comprising a second switching element section that outputs the signal as a second signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2097754A JP2655005B2 (en) | 1990-04-16 | 1990-04-16 | Pulse arc welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2097754A JP2655005B2 (en) | 1990-04-16 | 1990-04-16 | Pulse arc welding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03297564A true JPH03297564A (en) | 1991-12-27 |
| JP2655005B2 JP2655005B2 (en) | 1997-09-17 |
Family
ID=14200672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2097754A Expired - Lifetime JP2655005B2 (en) | 1990-04-16 | 1990-04-16 | Pulse arc welding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2655005B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005120758A1 (en) * | 2004-06-08 | 2005-12-22 | Kabushiki Kaisha Yaskawa Denki | Robot-welding controlling device and method |
| US7414222B2 (en) | 2003-05-07 | 2008-08-19 | Illinois Tool Works Inc. | Method and apparatus for pulse and short circuit arc welding |
| WO2012032703A1 (en) | 2010-09-10 | 2012-03-15 | パナソニック株式会社 | Arc welding control method |
| US8581146B2 (en) | 2008-10-22 | 2013-11-12 | Lincoln Global, Inc. | Automatic wire feeding system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58159977A (en) * | 1982-03-19 | 1983-09-22 | Matsushita Electric Ind Co Ltd | Dc arc welding machine |
| JPH01321078A (en) * | 1988-06-23 | 1989-12-27 | Mitsubishi Electric Corp | Pulse arc welding power source |
-
1990
- 1990-04-16 JP JP2097754A patent/JP2655005B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58159977A (en) * | 1982-03-19 | 1983-09-22 | Matsushita Electric Ind Co Ltd | Dc arc welding machine |
| JPH01321078A (en) * | 1988-06-23 | 1989-12-27 | Mitsubishi Electric Corp | Pulse arc welding power source |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7414222B2 (en) | 2003-05-07 | 2008-08-19 | Illinois Tool Works Inc. | Method and apparatus for pulse and short circuit arc welding |
| US8669490B2 (en) | 2003-05-07 | 2014-03-11 | Illinois Tool Works Inc. | Method and apparatus for pulse and short circuit arc welding |
| WO2005120758A1 (en) * | 2004-06-08 | 2005-12-22 | Kabushiki Kaisha Yaskawa Denki | Robot-welding controlling device and method |
| US7960672B2 (en) * | 2004-06-08 | 2011-06-14 | Kabushiki Yaskawa Denki | Robot welding controller and control method |
| US8581146B2 (en) | 2008-10-22 | 2013-11-12 | Lincoln Global, Inc. | Automatic wire feeding system |
| WO2012032703A1 (en) | 2010-09-10 | 2012-03-15 | パナソニック株式会社 | Arc welding control method |
| US8901454B2 (en) | 2010-09-10 | 2014-12-02 | Panasonic Corporation | Arc welding control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2655005B2 (en) | 1997-09-17 |
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