JPS594229B2 - Tungsten electrode welding prevention control device - Google Patents
Tungsten electrode welding prevention control deviceInfo
- Publication number
- JPS594229B2 JPS594229B2 JP10360581A JP10360581A JPS594229B2 JP S594229 B2 JPS594229 B2 JP S594229B2 JP 10360581 A JP10360581 A JP 10360581A JP 10360581 A JP10360581 A JP 10360581A JP S594229 B2 JPS594229 B2 JP S594229B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- arc
- voltage
- tungsten electrode
- arc voltage
- 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
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
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Description
【発明の詳細な説明】
本発明は、溶接中に発生するタングステン電極と溶着金
属あるいは母材開先面との溶着を未然に防止するための
タングステン電極溶着防止制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tungsten electrode welding prevention control device for preventing welding between a tungsten electrode and a weld metal or a groove surface of a base material that occurs during welding.
ＴＩＧ溶接法は、アーク溶接方法の中ではスパ１０ ツ
タの発生が無く、ピーク外観が良好であることや溶接電
流、電圧、速度、溶加ワイヤ量を任意独立に設定可能で
あわ、また、近年、アーク電圧を検出してアーク長を一
定に保持するアーク長制御（ＡＶＣ制御）との組合せが
普及するなど、自動１５溶接方法として優れた特性を有
している。Among the arc welding methods, the TIG welding method does not generate ivy, has a good peak appearance, and allows the welding current, voltage, speed, and amount of filler wire to be set arbitrarily and independently. It has excellent characteristics as an automatic 15 welding method, such as the combination with arc length control (AVC control) that detects the arc voltage and maintains the arc length constant.
ＴＩＧ自動溶接において、溶接中にタングステン電極と
溶着金属あるいは母材開先面との溶着が生じると、溶接
を中断させるとともに溶着したタングステン電極の開先
面からの除去及びタングス２０ チッが溶融した溶着金
属の除去、さらに溶接の再スタートのためのビード゛整
形等の繁雑な作業を要する。これらの作業には、グライ
ンダ加工やガウジング加工を要するが、溶接部がこれら
の工具を使用するのに狭すぎる場合や、作業に際して発
生２５する粉塵の処理に注意を要する溶接箇所の場合、
更にはビード手直し作業を皆無にするためには、溶着を
未然に防止することが必要となる。本発明は上記事情に
鑑みてなされたものであり、その目的は、ＴＩＧ自動溶
接装置において、溶接３０中のアーク電圧を検出し、ア
ーク電圧値が使用電流により定まる適正電圧値以下とな
つた時に溶接を停止するように制御することにより、Ｔ
ＩＧ自動溶接装置の誤動作や、何らかの外乱によつて発
生するタングステン電極と溶着金属あるいは母材３５開
先面との溶着を未然に防止することで、ＴＩＧ自動溶接
の無監視溶接化を一歩進めることができるタングステン
電極溶着防止制御装置を提供することである。In TIG automatic welding, if welding occurs between the tungsten electrode and the weld metal or the groove surface of the base metal during welding, the welding is interrupted, the welded tungsten electrode is removed from the groove surface, and the tungsten electrode is removed from the groove surface. It requires complicated work such as metal removal and bead shaping to restart welding. These operations require grinding or gouging, but if the welded area is too narrow to use these tools, or if the welded area requires careful handling of the dust generated during the operation,
Furthermore, in order to completely eliminate bead repair work, it is necessary to prevent welding. The present invention has been made in view of the above circumstances, and its purpose is to detect the arc voltage during welding 30 in a TIG automatic welding device, and to detect the arc voltage during welding 30 when the arc voltage value falls below the appropriate voltage value determined by the working current. By controlling the welding to stop, T
By preventing welding between the tungsten electrode and the weld metal or the groove surface of the base material 35 caused by malfunction of the IG automatic welding equipment or some kind of disturbance, we can take one step forward in unmonitored welding of TIG automatic welding. It is an object of the present invention to provide a tungsten electrode welding prevention control device that can prevent welding of tungsten electrodes.
ＴＩＧ自動溶接における溶接条件パラメータとしては、
アーク電流、電圧及び溶加ワイヤ量等があるが、本発明
者が検討した結果、タングステン電極の溶着に関係する
パラメータはアーク電圧値であつた。The welding condition parameters for TIG automatic welding are:
There are arc current, voltage, filler wire amount, etc., but as a result of the inventor's study, the parameter related to welding of the tungsten electrode was the arc voltage value.
すなわち、ＡＶＣ制御が組み合されたＴＩＧ自動溶接装
置を用いて試験を行うと、５０〜１００アンペアの低い
溶接電流範囲では約９ボルトの適正アーク電圧値に対し
て、アーク電圧を約８．５ボルト以下に低下させると、
アークの電流電圧平衡特性から外れるために、ＡＶＣ制
御の効果で溶接トーチはＡＶＣ制御用スライダの上でハ
ンチングを始め、ハンチングが続くとタングステン電極
は溶融クレータと溶着する。That is, when tested using a TIG automatic welding system combined with AVC control, in the low welding current range of 50 to 100 amperes, the arc voltage was reduced to about 8.5 volts for a proper arc voltage value of about 9 volts. When lowered below volts,
Because the arc deviates from the current-voltage equilibrium characteristic, the welding torch begins to hunt above the AVC control slider due to the effect of AVC control, and as the hunting continues, the tungsten electrode welds to the molten crater.
１００〜４００アンペアの高い電流範囲では１１〜１３
ボルトの適正電圧値に対してアーク電圧を約１０ボルト
以下に低下させると、同様にして溶接トーチのハンチン
グが起り、ハンチングが続くとタングステン電極は溶融
クレータと溶着する。11-13 in the high current range of 100-400 amps
When the arc voltage is lowered to about 10 volts or less with respect to the proper voltage value of the volt, hunting of the welding torch similarly occurs, and if the hunting continues, the tungsten electrode is welded to the molten crater.
また、溶接トーチのハンチングが始まると、それにとも
なつてアーク電圧値はより大きく振れた。更に検討を加
え、１０ボルトの適正アーク電圧値より約１ボルト低い
９ボルトの電圧値となつた時に、溶接停止信号を発生す
る制御を行なつて、溶着再現試験を実施した結果、タン
グステン電極が溶融金属や開先面に異常に接近した場合
や、溶接トーチがハンチングを起した場合には瞬時に溶
接停止動作が実行され、タングステン電極と溶着金属ま
たは母材開先面との溶着が未然に防止されることを確認
した。Furthermore, when hunting of the welding torch began, the arc voltage value fluctuated even more. After further consideration, we conducted a welding reproduction test by generating a welding stop signal when the voltage reached 9 volts, which is about 1 volt lower than the appropriate arc voltage of 10 volts, and found that the tungsten electrode If the welding torch comes abnormally close to the molten metal or groove surface, or if the welding torch causes hunting, a welding stop operation is executed instantly, preventing welding between the tungsten electrode and the weld metal or base metal groove surface. It has been confirmed that this can be prevented.
一般に、適正アーク電圧は使用電流によつて異なる。Generally, the appropriate arc voltage varies depending on the current used.
これは同一アーク長であつても、電流が増大すればアー
ク電圧が上昇するためである。第１図にタングステン電
極と母材との間隔すなわちアーク長ケパラメータとした
アーク電圧とアーク電流との関係を示すが、ここで、ア
ーク長０ｍｍは計算によつて求めたものである。このア
ーク長０ｍｍに相当する曲線はアーク電圧をＶ、アーク
電流をＩとすると、Ｖ＝０．００３１１１１＋８．８２
７・・・・・・（１）なる直線に近似できる。This is because even if the arc length is the same, as the current increases, the arc voltage increases. FIG. 1 shows the relationship between arc voltage and arc current, with the distance between the tungsten electrode and the base metal, that is, the arc length, as a parameter, where the arc length of 0 mm was determined by calculation. The curve corresponding to this arc length of 0 mm is V=0.0031111+8.82, where the arc voltage is V and the arc current is I.
7...It can be approximated by a straight line (1).
上述の関係を用いると、アーク電流を検出することによ
つて、適正電圧の設定を自動的に行なうことができる。Using the above relationship, it is possible to automatically set the appropriate voltage by detecting the arc current.
以下、本発明によるタングステン電極溶着防止制御装置
の一実施例について、図面にもとづいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tungsten electrode welding prevention control device according to the present invention will be described below with reference to the drawings.
第２図に示すように、溶接電源１とタングステン電極２
とが接続され、また、溶接電源１と母材３とが電流検出
器４を介して接続される。As shown in Figure 2, welding power source 1 and tungsten electrode 2
Further, the welding power source 1 and the base material 3 are connected via the current detector 4.
タングステン電極２と母材３との間に比較器５が接続さ
れ、電流検出器４は関数発生器６に接続され、関数発生
器６は比較器５に接続され、さらに、比較器５には出力
リレー７が接続される。また、第３図に示すシーケンス
制御回路に卦いて、常時開である溶接開始押釦スイツチ
８と直列に常時閉である溶接停止押釦スイツチ９が接続
され、さらに、溶接停止押釦スイツチ９と直列にリレー
１０が接続され、このリレー１０と並列にタイマー１１
が接続される。A comparator 5 is connected between the tungsten electrode 2 and the base metal 3, the current detector 4 is connected to a function generator 6, the function generator 6 is connected to the comparator 5, and the comparator 5 is connected to the Output relay 7 is connected. Further, in the sequence control circuit shown in FIG. 3, a normally closed welding stop pushbutton switch 9 is connected in series with a normally open welding start pushbutton switch 8, and a relay is connected in series with the welding stop pushbutton switch 9. 10 is connected, and a timer 11 is connected in parallel with this relay 10.
is connected.
また、溶接開始押釦スイツチ８と並列にリレー１０のＡ
接点１０ａと上記出力リレー７のＢ接点７ａとの直列回
路が接続され、また、Ｂ接点７ａと並列にタイマー１１
のオンデイレ一Ｂ接点１１ａが接続される。いま、溶接
開始押釦スイツチ８を押すと、リレー一１０が励磁虹れ
てリレー１０のＡ接点１０ａが閉じ、また、このときＢ
接点１１ａが閉じているのでリレー１０は自己保持され
、ここで溶接が開始される。In addition, A of the relay 10 is connected in parallel with the welding start push button switch 8.
A series circuit between the contact 10a and the B contact 7a of the output relay 7 is connected, and a timer 11 is connected in parallel with the B contact 7a.
The on-day delay-B contact 11a is connected. Now, when the welding start push button switch 8 is pressed, the relay 10 is energized and the A contact 10a of the relay 10 is closed, and at this time, the B
Since the contact point 11a is closed, the relay 10 is self-held, and welding is started now.
また、リレー１０が励磁されると同時にタイマー１１が
動作を開始し、タイマー１１のアンディレーＢ接点１１
ａはアーク発生後の一定時間後に開く。溶接が開始され
て、タングステン電極２と母材３の間にアークが発生す
るぎ、アークが発生すると比較器５の出力リレー７はオ
フ状態となわ、そのＢ接点７ａは閉じ、この接点を介し
てリレー１０の自己保持が続く。なお、タイマー１１は
、溶接開始時のアーク電圧の過渡的な変動によつて、比
較器５が動作して出力リレー７が励磁され、そのＢ接点
７ａが開いてリレー１０がオフとなつて溶接が停止岱れ
るのを溶接開始から一定時間防止するために設けられる
。いま、タングステン電極２と母材３との間にアークが
発生すると、このアーク電流を電流検出器４によつて検
出し、この電流値が関数発生器６に入力され、式（１）
の演算が行なわれて適正アーク電圧設定値ＶＲＯ，が出
力されてこれが比較器５に入力される。Also, at the same time as the relay 10 is energized, the timer 11 starts operating, and the unrelay B contact 11 of the timer 11
A opens after a certain period of time after the arc occurs. When welding is started and an arc is generated between the tungsten electrode 2 and the base metal 3, the output relay 7 of the comparator 5 is turned off, its B contact 7a is closed, and the The self-holding of the relay 10 continues. In addition, the timer 11 is activated by the transient fluctuation of the arc voltage at the start of welding, which causes the comparator 5 to operate and the output relay 7 to be energized, the B contact 7a of which is opened, and the relay 10 to be turned off, thereby starting the welding process. This is provided to prevent the welding from stopping for a certain period of time from the start of welding. Now, when an arc occurs between the tungsten electrode 2 and the base metal 3, this arc current is detected by the current detector 4, and this current value is input to the function generator 6, and the equation (1)
The calculation is performed to output the appropriate arc voltage setting value VRO, which is input to the comparator 5.
比較器５に訃いて、タングステン電極２と母材３との間
のアーク電圧Ｖａとアーク電圧設定値Ｖ３８ｆとが比較
され、Ｖａ＞ＶＲ８ｆならば出力カレー７がオフ状態を
保つて第３図に示す回路によつて溶接が続行され、Ｖａ
＜ＶＲｅｆになると出力リレー７がオン状態となつて溶
接が停止される。例えば、アーク電流１が２００Ａの場
合、式（１）よりアーク電圧設定ＲＯｆは、ＶＲｅｆ＝
０．０３１１１×２００＋８．８２７＝９．４４９Ｍす
なわち、アーク電圧Ｖａが約９．５Ｖ以下になると比較
器５が動作し、出力リレー７がオン状態となつて溶接が
停止される。The comparator 5 compares the arc voltage Va between the tungsten electrode 2 and the base metal 3 with the arc voltage set value V38f, and if Va>VR8f, the output curry 7 remains off and the voltage shown in FIG. Welding continues with the circuit shown, Va
<VRef, the output relay 7 is turned on and welding is stopped. For example, when the arc current 1 is 200A, the arc voltage setting ROf is calculated from equation (1) as VRef=
0.03111×200+8.827=9.449M That is, when the arc voltage Va becomes approximately 9.5V or less, the comparator 5 is activated, the output relay 7 is turned on, and welding is stopped.
以上説明したように、本発明によるタングステン電極溶
着防止制御装置においては、アーク電流を検出して、関
数発生器を用いてこのアーク電流に対する適正アーク電
圧を算出し、これを設定値として実際のアーク電圧と比
較して、実際のアーク電圧が設定電圧よりも小さくなる
と、溶接を停止するようにしたから、溶接条件を変更し
た場合でも、適正電圧値の設定力迫動的に行なえ、ＡＣ
Ｖ制御が組み合されたＴＩＣ自動溶接装置に訃いて、ア
ーク電圧低下によるハンチングによつて起るタングステ
ン電極と開先面との溶着を防止することができ、また、
ＡＶＣ制御が組み合されていないＴＩＧ自動溶接装置に
卦いても、本発明を用いるとタングステン電極と溶接部
の異常な接近を検出して溶接停止動作を実行でき、電極
と開先との溶着を防止することができる。As explained above, in the tungsten electrode welding prevention control device according to the present invention, an arc current is detected, a function generator is used to calculate an appropriate arc voltage for this arc current, and this is used as a set value to control the actual arc. Compared to the voltage, welding is stopped when the actual arc voltage becomes smaller than the set voltage, so even if the welding conditions are changed, the appropriate voltage value can be set dynamically, and the AC
By using a TIC automatic welding device combined with V control, it is possible to prevent welding between the tungsten electrode and the groove surface caused by hunting due to a drop in arc voltage, and
Even with TIG automatic welding equipment that is not combined with AVC control, the present invention can detect abnormal proximity between the tungsten electrode and the welding area and execute a welding stop operation, preventing welding between the electrode and the groove. It can be prevented.
第１図はアーク電圧とアーク電流との関係を示すグラフ
、第２図は本発明の一実施例を示すプロツク図、第３図
は本発明の一実施例を示す回路図である。
２・・・・・・タングステン電極、３・・・・・・母材
、４・・・・・・電流検出器、５・・・・・・比較器、
６・・・・・・関数発生器、７・・・・・・出力リレー
。FIG. 1 is a graph showing the relationship between arc voltage and arc current, FIG. 2 is a block diagram showing one embodiment of the present invention, and FIG. 3 is a circuit diagram showing one embodiment of the present invention. 2... Tungsten electrode, 3... Base material, 4... Current detector, 5... Comparator,
6...Function generator, 7...Output relay.
Claims (1)
させて被溶接材を溶接するＴＩＧ自動溶接装置において
、タングステン電極と被溶接材との間のアーク電圧を検
出するアーク電圧検出部と、アーク電流を検出するアー
ク電流検出部と、このアーク電流検出部からの信号に応
じた適正なアーク電圧を所定の演算式により算出する演
算部と、算出したアーク電圧を設定電圧として設定する
電圧設定部と、上記検出されたアーク電圧と上記設定電
圧とを比較して、アーク電圧が設定電圧よりも低い場合
に溶接を停止するための信号を出力する比較部とを備え
たことを特徴とするタングステン電極溶着防止制御装置
。1. In a TIG automatic welding device that generates an arc between a tungsten electrode and a workpiece to weld the workpieces, an arc voltage detection section that detects an arc voltage between the tungsten electrode and the workpiece; An arc current detection section that detects current, a calculation section that calculates an appropriate arc voltage according to a signal from this arc current detection section using a predetermined calculation formula, and a voltage setting section that sets the calculated arc voltage as a set voltage. and a comparison unit that compares the detected arc voltage and the set voltage and outputs a signal for stopping welding when the arc voltage is lower than the set voltage. Electrode welding prevention control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10360581A JPS594229B2 (en) | 1981-06-30 | 1981-06-30 | Tungsten electrode welding prevention control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10360581A JPS594229B2 (en) | 1981-06-30 | 1981-06-30 | Tungsten electrode welding prevention control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS583787A JPS583787A (en) | 1983-01-10 |
| JPS594229B2 true JPS594229B2 (en) | 1984-01-28 |
Family
ID=14358399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10360581A Expired JPS594229B2 (en) | 1981-06-30 | 1981-06-30 | Tungsten electrode welding prevention control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS594229B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4492841A (en) * | 1983-04-18 | 1985-01-08 | Arcair Company | Constant potential/constant current automatic control system for air-carbon arc metal removal |
| JPS6068165A (en) * | 1983-09-21 | 1985-04-18 | Matsushita Electric Ind Co Ltd | Power source device for welding |
| US4531045A (en) * | 1984-06-27 | 1985-07-23 | Hobart Brothers Company | Trigger hold circuit for welding power supply |
-
1981
- 1981-06-30 JP JP10360581A patent/JPS594229B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS583787A (en) | 1983-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4100390A (en) | Control means for tig type torches and the like | |
| US20100224608A1 (en) | Control method for arc welding apparatus and arc welding apparatus | |
| US20040262280A1 (en) | Arc welding method | |
| JPH10277740A (en) | Pulse arc welding equipment | |
| US20200130094A1 (en) | Systems and methods to start arc welding | |
| CA1230166A (en) | Constant potential/constant current automatic control system for air-carbon arc metal removal systems | |
| JPS594229B2 (en) | Tungsten electrode welding prevention control device | |
| JPH0116606B2 (en) | ||
| US4456813A (en) | Hot wire type arc welding system | |
| JP3110135B2 (en) | Control method of consumable electrode type AC arc welding machine | |
| US4575604A (en) | Constant potential/constant current automatic control system for air-carbon arc metal removal | |
| KR880000950B1 (en) | Arc welder for short circuiting | |
| JPH0471629B2 (en) | ||
| KR880000912B1 (en) | Arc welder for short circuiting | |
| JP2686183B2 (en) | AC TIG welding machine | |
| JPH0329503B2 (en) | ||
| JPS6255472B2 (en) | ||
| JP2010247224A (en) | Arc welding method | |
| JPH0647547A (en) | Method and device for controlling arc welding robot | |
| JPH1177298A (en) | Arc spot welding control device | |
| KR880000949B1 (en) | Arc welder for short circuiting | |
| JPH08215846A (en) | Arc welding equipment | |
| JP2534373B2 (en) | Arc welding machine | |
| JPH07314136A (en) | Consumable electrode type arc voltage automatic control method and controller therefor | |
| JPS6247108B2 (en) |