JPH0243568Y2 - - Google Patents
Info
- Publication number
- JPH0243568Y2 JPH0243568Y2 JP1983113607U JP11360783U JPH0243568Y2 JP H0243568 Y2 JPH0243568 Y2 JP H0243568Y2 JP 1983113607 U JP1983113607 U JP 1983113607U JP 11360783 U JP11360783 U JP 11360783U JP H0243568 Y2 JPH0243568 Y2 JP H0243568Y2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- setting
- arc length
- voltage
- 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.)
- Expired
Links
- 238000003466 welding Methods 0.000 claims description 46
- 238000002789 length control Methods 0.000 claims description 12
- 239000010953 base metal Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 13
- 239000010937 tungsten Substances 0.000 description 13
- 229910052721 tungsten Inorganic materials 0.000 description 13
- 239000003990 capacitor Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Landscapes
- Arc Welding Control (AREA)
Description
【考案の詳細な説明】
技術分野
この考案は溶接装置に用いられるスロープダウ
ン制御装置に関する。[Detailed Description of the Invention] Technical Field This invention relates to a slope-down control device used in a welding device.
従来技術
不活性ガス中において例えば非消耗電極である
タングステン溶接電極を所定速度で降下させ母材
との間でアークを発生させながら溶接を行ういわ
ゆるTIG自動溶接装置において、一般に高周波ス
タートあるいはスクラツチスタートによりタング
ステン電極よりアークが発生され直ちにあるいは
時限後アーク長制御が行われる。この種の溶接装
置においては、タングステン電極と母材との間の
アーク長は所定設定電圧とアーク電圧とを比較し
てその差に応じてモータを駆動し、タングステン
電極の昇降速度を制御することにより、アーク長
が設定電圧と比例したものとなるように制御され
ている。Prior Art In so-called TIG automatic welding equipment, which performs welding by lowering a tungsten welding electrode, which is a non-consumable electrode, at a predetermined speed in an inert gas and generating an arc between it and the base metal, high-frequency start or scratch start is generally used. An arc is generated from the tungsten electrode, and arc length control is performed immediately or after a time limit. In this type of welding equipment, the arc length between the tungsten electrode and the base metal is determined by comparing the arc voltage with a predetermined set voltage and driving the motor according to the difference to control the lifting and lowering speed of the tungsten electrode. The arc length is controlled to be proportional to the set voltage.
従来、アーク長制御開始以前において、タング
ステン電極と母材間の距離（l0）（第２図ｂ参照）
が溶接実行時でのアーク長（l1）にくらべて長過
ぎる場合、アーク長制御が開始されると、アーク
長がl0からl1へと急激に短くなるように、タング
ステン電極を移送するモータが高速で駆動される
のでその慣性によりタングステン電極の行き過ぎ
が生じてタングステン電極が母材に短絡しやすい
という問題がある。一度短絡するとその短絡を補
修するために手間がかかり、かつ溶接欠陥にも繋
がる恐れがあるため、極力短絡を防止するように
しなければならない。しかるに従来のこの種の
TIG溶接装置においては、上述の欠点を改善する
ための対策が何ら講じられていなかつた。 Conventionally, before starting arc length control, the distance between the tungsten electrode and the base metal (l 0 ) (see Figure 2b)
is too long compared to the arc length (l 1 ) at the time of welding, when arc length control is started, the tungsten electrode is transferred so that the arc length is rapidly shortened from l 0 to l 1 . Since the motor is driven at high speed, there is a problem in that the tungsten electrode tends to overshoot due to its inertia, causing the tungsten electrode to short-circuit to the base material. Once a short circuit occurs, it takes time and effort to repair the short circuit, and it may also lead to welding defects, so it is necessary to prevent short circuits as much as possible. However, this type of conventional
In TIG welding equipment, no measures have been taken to improve the above-mentioned drawbacks.
目 的
この考案は上述の問題を解決するためになされ
たものであつて、起動時において設定電圧を時間
とともにスロープダウンさせることにより徐々に
溶接実行時の設定値へ変化させ、溶接電極の行過
ぎを防止し、溶接電極の損傷や母材との短絡をな
くし、円滑な起動動作を行える制御装装置を提供
することを目的とするものである。Purpose This invention was made to solve the above-mentioned problem, and by decreasing the slope of the set voltage over time at startup, it gradually changes to the set value at the time of welding, and prevents the welding electrode from overshooting. The object of the present invention is to provide a control device that can prevent damage to the welding electrode and short circuit with the base metal, and can perform a smooth startup operation.
考案の要点
この考案は、(イ)非消耗溶接電極と母材との間の
アーク電圧を検出するアーク電圧検出手段と、(ロ)
このアーク電圧検出手段の検出値と設定値との比
較値で非消耗溶接電極を指向方向へ昇降させるア
ーク長制御部と、(ハ)このアーク長制御部で比較す
る設定値を出力する設定部に、本溶接時の所定ア
ーク長い相当する溶接電圧の設定値を設定する第
１の設定手段と、(ニ)この第１の設定手段で設定さ
れた設定値に加算する設定値を設定する第２の設
定手段と、(ホ)この第２の設定手段で設定された設
定値を溶接起動信号にて減少させつつ前記第１の
設定手段の設定値に加算する設定値加算手段とを
備えた非消耗電極式溶接装置のスロープダウン制
御装置である。Key points of the invention This invention consists of (a) arc voltage detection means for detecting the arc voltage between the non-consumable welding electrode and the base metal; and (b)
an arc length control section that raises and lowers the non-consumable welding electrode in the pointing direction based on a comparison value between the detection value of the arc voltage detection means and the set value; and (c) a setting section that outputs the set value to be compared with this arc length control section. (d) a first setting means for setting a set value of a welding voltage corresponding to a predetermined arc length during main welding; and (d) a first setting means for setting a set value to be added to the set value set by the first setting means. and (e) set value adding means for adding the set value set by the second setting means to the set value of the first setting means while decreasing the set value by the welding start signal. This is a slope-down control device for non-consumable electrode type welding equipment.
実施例
以下にこの考案の一実施例を図面とともに説明
する。Embodiment An embodiment of this invention will be described below with reference to the drawings.
第１図において、１はアーク長設定部、２はア
ーク長制御部、３はタングステン溶接電極、４は
母材、５はアーク電圧検出器である。 In FIG. 1, 1 is an arc length setting section, 2 is an arc length control section, 3 is a tungsten welding electrode, 4 is a base material, and 5 is an arc voltage detector.
アーク長制御部２はアーク長設定部１から印加
される設定電圧Vsと、溶接トーチ６と母材４と
の間のアーク電圧Vaとを入力されて、両者の差
に対応した値でモータ７を速度制御して溶接トー
チ６の昇降速度を制御し、アーク長ｌが設定電圧
Vsと対応した長さとなるように制御する。この
種の制御動作は公知のTIG溶接におけるものと同
じであり詳細な説明は省略する。 The arc length control section 2 receives the set voltage Vs applied from the arc length setting section 1 and the arc voltage Va between the welding torch 6 and the base metal 4, and controls the motor 7 at a value corresponding to the difference between the two. The vertical speed of the welding torch 6 is controlled by controlling the speed of the welding torch 6, and the arc length l is the set voltage.
Control so that the length corresponds to Vs. This type of control operation is the same as that in known TIG welding, and detailed explanation will be omitted.
アーク長設定部１において、１０は本溶接時の
アーク長を設定する第１設定器であり、たとえば
可変抵抗器が用いられる。第１設定器１０の出力
は抵抗１１を介して、第１演算増幅器１２の一方
の入力端子に接続される。 In the arc length setting section 1, 10 is a first setting device for setting the arc length during main welding, and for example, a variable resistor is used. The output of the first setting device 10 is connected to one input terminal of a first operational amplifier 12 via a resistor 11.
１３はアーク溶接起動時の第２図に示す設定電
圧Vcを出力する第２設定器であり、可変抵抗器
が用いられる。第２設定器１３の出力は溶接起動
直前までオン、溶接起動後オフとなる溶接リレー
のｂ接点１４ｂを介して、コンデンサ１５に接続
されるとともに、抵抗１６を介して第２演算増幅
器１７に接続される。 13 is a second setting device that outputs the set voltage Vc shown in FIG. 2 at the time of starting arc welding, and a variable resistor is used. The output of the second setting device 13 is connected to the capacitor 15 via the b contact 14b of the welding relay, which is on until just before welding starts and turns off after welding starts, and is also connected to the second operational amplifier 17 via a resistor 16. be done.
１８はコンデンサ１５の放電時間を設定する可
変抵抗器であり、上記溶接リレーのａ接点１４ａ
を介してコンデンサ１５に接続される。 18 is a variable resistor that sets the discharge time of the capacitor 15, and is connected to the a contact 14a of the welding relay.
It is connected to the capacitor 15 via.
第１演算増幅器１２の出力は抵抗２０を介し
て、また第２演算増幅器１７の出力は抵抗２１を
介して、それぞれ、第３演算増幅器２２に接続さ
れ、第１、第２演算増幅器１２，１７の出力電圧
の和が第３演算増幅器の出力端子に得られ、この
出力電圧はアーク長設定電圧Vsとして、アーク
長制御部２に入力される。 The output of the first operational amplifier 12 is connected to a third operational amplifier 22 via a resistor 20, and the output of the second operational amplifier 17 is connected to a third operational amplifier 22 via a resistor 21. The sum of the output voltages is obtained at the output terminal of the third operational amplifier, and this output voltage is input to the arc length control section 2 as the arc length setting voltage Vs.
上記の構成において、タングステン溶接電極３
と母材４間の距離がl0（第２図ｂ）となつている
ものとする。 In the above configuration, the tungsten welding electrode 3
It is assumed that the distance between the base material 4 and the base material 4 is l 0 (Fig. 2b).
第１設定器１０は、本溶接時の所定アーク長l1
に相当する電圧Vb（第２図ａ）が設定されてい
て、また、第２設定器１３は、Vi−Vbに相当す
る電圧Vcが設定されている。 The first setting device 10 has a predetermined arc length l 1 during main welding.
A voltage Vb (FIG. 2a) corresponding to Vi-Vb is set in the second setter 13, and a voltage Vc corresponding to Vi-Vb is set.
また、溶接リレーのｂ接点１４ｂがオン状態で
第２設定器１３からの電圧Vcがコンデンサ１５
に充電され、第２演算増幅器１７には、この電圧
Vcが印加されている。 Also, when the b contact 14b of the welding relay is in the ON state, the voltage Vc from the second setting device 13 is applied to the capacitor 15.
The second operational amplifier 17 receives this voltage.
Vc is applied.
一方第１演算器１２２の出力電圧と第２演算増
幅器１７の出力電圧が第３演算増幅器２２で加算
され、Vi＝Vc＋Vbが設定電圧Vsとしてアーク
長制御部２に印加されている。 On the other hand, the output voltage of the first operational unit 122 and the output voltage of the second operational amplifier 17 are added by the third operational amplifier 22, and Vi=Vc+Vb is applied to the arc length control section 2 as the set voltage Vs.
ここでは、溶接機を起動すると、溶接リレーの
ｂ接点１４ｂがオフし、ａ接点１４ａがオンとな
つて、コンデンサ１５の電圧は可変抵抗器１８を
介して放電され、このコンデンサ１５の容量Ｃと
可変抵抗器１８の抵抗Ｒの時定数にしたがつて漸
次低下する。 Here, when the welding machine is started, the B contact 14b of the welding relay is turned off, the A contact 14a is turned on, the voltage of the capacitor 15 is discharged via the variable resistor 18, and the capacitance C of this capacitor 15 and It gradually decreases according to the time constant of the resistance R of the variable resistor 18.
それ故第２演算増幅器１７の出力電圧も漸減
し、第３演算増幅器２２の出力電圧Vsも第２図
ａのＰ−Ｑで示すようにスロープダウンする。そ
れ故、アーク長ｌもl0からl1へ徐々に低下する。 Therefore, the output voltage of the second operational amplifier 17 also gradually decreases, and the output voltage Vs of the third operational amplifier 22 also slopes down as shown by PQ in FIG. 2a. Therefore, the arc length l also gradually decreases from l 0 to l 1 .
このようにアーク長ｌが徐々に変化するので、
溶接トーチ６が急激に移動せず、慣性による溶接
電極３の行き過ぎが防止され、短絡が防止され
る。 As the arc length l changes gradually in this way,
The welding torch 6 does not move suddenly, the welding electrode 3 is prevented from overshooting due to inertia, and short circuits are prevented.
なお、アーク長をl0からl1へのスロープダウン
変化率は可変抵抗１８の調整によつて変えること
ができる。なお、溶接条件によつて可変抵抗器１
３の設定電圧を変更することができる。 Note that the slope-down change rate of the arc length from l 0 to l 1 can be changed by adjusting the variable resistor 18. In addition, depending on the welding conditions, variable resistor 1
3 setting voltage can be changed.
考案の効果
以上詳述したように、この考案は、設定電圧に
対応してアーク長を制御しながら溶接を行なうア
ーク溶接装置において起動時に上記設定電圧をス
ロープダウンさせるようにしたから、溶接電極が
急激に母材に対して突出することがなく、タング
ステン電極の損傷や母材との短絡を防止でき、起
動時の短絡が防止され、良好な溶接を能率的に行
なうことができる。Effects of the invention As detailed above, this invention is based on an arc welding device that performs welding while controlling the arc length in accordance with the set voltage.Since the set voltage is sloped down at startup, the welding electrode is The tungsten electrode does not suddenly protrude relative to the base material, and damage to the tungsten electrode and short circuit with the base metal can be prevented. Short circuit at startup is prevented, and good welding can be performed efficiently.
第１図はこの考案の一実施例を示す回路図、第
２図ａはアーク長設定電圧の変化を示すグラフ、
第２図ｂはアーク長の変化を示すグラフである。
１……アーク長設定部、２……アーク長制御
部、３……タングステン電極、４……母材、５…
…アーク電圧検出器、６……溶接トーチ、７……
モータ、１０……第１設定器、１３……第２設定
器、１５……コンデンサ、１７……第２演算増幅
器、１８……可変抵抗器、２２……第３演算増幅
器、Vcc……基準電圧。
Fig. 1 is a circuit diagram showing an embodiment of this invention, Fig. 2a is a graph showing changes in arc length setting voltage,
FIG. 2b is a graph showing changes in arc length. DESCRIPTION OF SYMBOLS 1... Arc length setting part, 2... Arc length control part, 3... Tungsten electrode, 4... Base material, 5...
...Arc voltage detector, 6...Welding torch, 7...
Motor, 10...First setting device, 13...Second setting device, 15...Capacitor, 17...Second operational amplifier, 18...Variable resistor, 22...Third operational amplifier, Vcc...Reference Voltage.
Claims (1)
検出するアーク電圧検出手段と、 (ロ) このアーク電圧検出手段の検出値と設定値と
の比較値で非消耗溶接電極を指向方向へ昇降さ
せるアーク長制御部と、 (ハ) このアーク長制御部で比較する設定値を出力
する設定部に、本溶接時の所定アーク長に相当
する溶接電圧の設定値を設定する第１の設定手
段と、 (ニ) この第１の設定手段で設定された設定値に加
算する設定値を設定する第２の設定手段と、 (ホ) この第２の設定手段で設定された設定値を溶
接起動信号にて減少させつつ前記第１の設定手
段の設定値に加算する設定値加算手段とを備え
た非消耗電極式溶接装置のスロープダウン制御
装置。[Scope of Claim for Utility Model Registration] (a) Arc voltage detection means for detecting the arc voltage between the non-consumable welding electrode and the base metal, and (b) A comparison between the detected value and the set value of this arc voltage detection means. an arc length control section that raises and lowers the non-consumable welding electrode in the directional direction according to the value, and (c) a setting section that outputs a set value to be compared with this arc length control section, and a welding voltage corresponding to the predetermined arc length during main welding. (d) a second setting means for setting a setting value to be added to the setting value set by this first setting means; (e) this second setting means A slope-down control device for a non-consumable electrode type welding device, comprising set value adding means for decreasing the set value set by the setting means using a welding start signal and adding it to the set value of the first setting means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11360783U JPS6020363U (en) | 1983-07-20 | 1983-07-20 | Slope down control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11360783U JPS6020363U (en) | 1983-07-20 | 1983-07-20 | Slope down control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6020363U JPS6020363U (en) | 1985-02-12 |
| JPH0243568Y2 true JPH0243568Y2 (en) | 1990-11-20 |
Family
ID=30262919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11360783U Granted JPS6020363U (en) | 1983-07-20 | 1983-07-20 | Slope down control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6020363U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52100347A (en) * | 1976-02-20 | 1977-08-23 | Matsushita Electric Ind Co Ltd | Method of arc start |
-
1983
- 1983-07-20 JP JP11360783U patent/JPS6020363U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52100347A (en) * | 1976-02-20 | 1977-08-23 | Matsushita Electric Ind Co Ltd | Method of arc start |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6020363U (en) | 1985-02-12 |
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