JPH03472A - Method and equipment for ac tig welding - Google Patents
Method and equipment for ac tig weldingInfo
- Publication number
- JPH03472A JPH03472A JP13455489A JP13455489A JPH03472A JP H03472 A JPH03472 A JP H03472A JP 13455489 A JP13455489 A JP 13455489A JP 13455489 A JP13455489 A JP 13455489A JP H03472 A JPH03472 A JP H03472A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- output
- arc voltage
- value
- welding
- 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 41
- 238000000034 method Methods 0.000 title claims description 11
- 239000010953 base metal Substances 0.000 claims abstract description 6
- 230000007423 decrease Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims 2
- 230000035515 penetration Effects 0.000 abstract description 19
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003079 width control Methods 0.000 description 2
- 241000283986 Lepus Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
- Arc Welding Control (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、アルミニウムやその合金などの溶接に用いら
れる交流ティグ溶接方法および装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an AC TIG welding method and apparatus used for welding aluminum, its alloys, etc.
溶接条件によって溶接結果が大きく左右されることは広
く知られており、例えば溶込み深さと溶接条件の間には
JacksonO式、
ここで、k:溶接方法により決まる定数I:溶接電流
■:溶接速度
vl :アーク電圧
が成立することが、安藤・長谷用;「溶接アーク現象」
増補版、産業出版(1967年)、p、368〜369
などで紹介されている。It is widely known that welding results are greatly influenced by welding conditions. For example, the relationship between penetration depth and welding conditions is expressed by the Jackson O equation, where k: constant determined by the welding method I: welding current ■: welding speed vl: For Ando and Hase, the establishment of arc voltage is the "welding arc phenomenon"
Expanded edition, Sangyo Publishing (1967), p. 368-369
It is introduced in etc.
Jacksonの式から明らかなように、非消耗電極を
用いるティグ溶接では、アーク電圧■1が溶込み深さに
大きく影響するため、水平固定管の全姿勢裏波溶接など
に適用する場合には、特開昭49−20044号に記載
のように、アーク電圧と設定電圧の偏差をとってトーチ
位置をフィードバック制御し、所定の溶込み深さが得ら
れるようにしている。As is clear from Jackson's equation, in TIG welding using non-consumable electrodes, the arc voltage (1) greatly affects the penetration depth. As described in Japanese Patent Application Laid-Open No. 49-20044, the torch position is feedback-controlled by taking the deviation between the arc voltage and the set voltage to obtain a predetermined penetration depth.
しかし、アーク電圧すなわちアーク長を一定に保つよう
にトーチ位置を制御するためには、スライドベースおよ
び駆動モータなどから構成されるトーチ移動機構が必要
であり、装置が複雑になるとともに、水平固定管の自動
溶接装置などでは溶接部の周辺スペースが狭いために使
用上制約を受ける場合がある。However, in order to control the torch position so as to keep the arc voltage, or arc length, constant, a torch moving mechanism consisting of a slide base and a drive motor is required, which makes the device complex and requires a horizontally fixed tube. In automatic welding equipment, etc., the space around the welding part is narrow, so there may be restrictions on its use.
本発明の目的は、アーク電圧が変化した場合に、トーク
移動機構によるトーチ位置制御を行わなくても溶込み深
さを所定の値に保ことができる交流ティグ溶接方法およ
び装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an AC TIG welding method and apparatus that can maintain the penetration depth at a predetermined value without controlling the torch position using a talk moving mechanism when the arc voltage changes. be.
〔課題を解決するための手段)
上記目的を達成するために本発明の交流ティグ溶接方法
は、非消耗電極と母材の間に溶接電源の交流出力を印加
することによって発生するアークを用いて母材を溶接す
る際に、前記交流出力の周波数をアーク電圧の増減に対
応して変化させることを特徴とする。[Means for Solving the Problems] In order to achieve the above object, the AC TIG welding method of the present invention uses an arc generated by applying an AC output of a welding power source between a non-consumable electrode and a base metal. The present invention is characterized in that the frequency of the AC output is changed in accordance with an increase or decrease in arc voltage when welding the base metal.
具体的には、交流出力の周波数をアーク電圧に略比例し
て変化させればよい。Specifically, the frequency of the AC output may be changed approximately in proportion to the arc voltage.
本発明の交流ティグ溶接装置は、上記方法を実施するた
めに、直流を可変周波数の交流に変換する手段、その交
流周波数が変化しても交流に変換される前の直流電流値
を一定に保つ手段、アーク電圧を検出する手段およびア
ーク電圧と交流周波数の所定の関係に従いアーク電圧の
検出値に応じて前記直交変換手段の出力周波数を規定す
る手段を備え、前記直交変換手段の交流出力を電極・母
材間に印加するようにしたものである。In order to carry out the above method, the AC TIG welding device of the present invention has a means for converting direct current into alternating current with a variable frequency, and maintains a constant value of the direct current before being converted to alternating current even if the alternating current frequency changes. means for detecting an arc voltage, and means for defining an output frequency of the orthogonal conversion means according to a detected value of the arc voltage according to a predetermined relationship between the arc voltage and the AC frequency, the AC output of the orthogonal conversion means being connected to an electrode.・It is designed to be applied between the base materials.
溶接電流、溶接速度およびアーク長を一定としたままで
電極・母材間に印加される交流出力の周波数(以下、交
流周波数と称する)を変化させて、溶込み深さと密接な
関係を持つアーク圧力を測定すると、第3図のようであ
り、交流周波数の増加とともにアーク圧力は上昇し、直
流溶接でのアーク圧力に近付く。The welding current, welding speed, and arc length are kept constant, but the frequency of the AC output applied between the electrode and the base metal (hereinafter referred to as AC frequency) is varied to create an arc that has a close relationship with the penetration depth. When the pressure is measured, it is as shown in Figure 3, and as the AC frequency increases, the arc pressure increases and approaches the arc pressure in DC welding.
このような交流周波数によるアーク圧力の変化が溶込み
深さに与える影響の一例を示すと、第4図のようであり
、交流周波数を商用周波数より高くすると溶込み深さが
深くなり、低くすると溶込み深さが浅くなる。An example of the effect that changes in arc pressure due to AC frequency have on penetration depth is shown in Figure 4. When the AC frequency is higher than the commercial frequency, the penetration depth becomes deeper, and when it is lower than the commercial frequency, the penetration depth becomes deeper. Penetration depth becomes shallower.
第4図において、商用周波数での交流溶接について考え
ると、アーク電圧が基準値■1゜から■a+に変化した
際に溶込み深さはPoからP、に増加する。また、アー
ク電圧がV、。からVatに変化すすると、溶込み深さ
はPoからP+に減少する。In FIG. 4, considering AC welding at a commercial frequency, the penetration depth increases from Po to P when the arc voltage changes from the reference value ■1° to ■a+. Also, the arc voltage is V. When changing from Po to Vat, the penetration depth decreases from Po to P+.
しかし、アーク電圧が■、、となった場合の交流周波数
を25H2に設定すると、その溶込み深さはPoとなり
、商用周波数によるアーク電圧■、。での溶込み深さと
同じ値にすることができる。同様に、アーク電圧がVa
ffiとなった場合には、交流周波数を250Hzに設
定すると、溶込み深さは変化しない。すなわち、第2図
のようにアーク電圧に略比例して交流周波数を変化させ
ることにより、溶込み深さを所定の値に保つことができ
る。However, if the AC frequency is set to 25H2 when the arc voltage becomes ■, , the penetration depth becomes Po, and the arc voltage at the commercial frequency becomes ■. It can be set to the same value as the penetration depth in . Similarly, if the arc voltage is Va
ffi, the penetration depth does not change if the AC frequency is set to 250 Hz. That is, by changing the AC frequency approximately in proportion to the arc voltage as shown in FIG. 2, the penetration depth can be maintained at a predetermined value.
本発明のティグ溶接方法を実施するための溶接装置の構
成の一例を第1図に示す、第1図において、1.2はそ
れぞれ商用交流入力を高周波交流に変換するための整流
器および一次インバータ回路で、−次インバータ回路2
はパルス幅制御回路3で制御された高周波交流を溶接変
圧器5に入力する。6は変圧器5の二次側出力を直流に
変換するための整流器、7は直流に変換された電流値i
の検出回路、9は交流溶接を行うために直流を再び交流
に変換するための二次インバータ回路である。出力電流
値は、二次インバータ回路9で交流に変換される前の直
流電圧値iを電流検出回路7で検出し、その値が出力電
流設定器8で設定された値Iと一致するように、誤差増
幅器4を介してパルス制御回路3をフィードバック制御
することにより、所定の値に保たれる。An example of the configuration of a welding apparatus for implementing the TIG welding method of the present invention is shown in FIG. 1. In FIG. 1, 1.2 is a rectifier and a primary inverter circuit for converting commercial AC input into high frequency AC, respectively. So, -order inverter circuit 2
inputs the high frequency alternating current controlled by the pulse width control circuit 3 to the welding transformer 5. 6 is a rectifier for converting the secondary output of the transformer 5 into direct current, and 7 is a current value i converted to direct current.
9 is a secondary inverter circuit for converting direct current back into alternating current for performing alternating current welding. The output current value is determined by detecting the DC voltage value i before being converted to AC by the secondary inverter circuit 9 using the current detection circuit 7, and adjusting the output current value so that it matches the value I set by the output current setting device 8. , is maintained at a predetermined value by feedback-controlling the pulse control circuit 3 via the error amplifier 4.
二次インバータ回路9で生成される交流の周波数および
電極プラス時間比率(d、、は、関数発生器16および
d6.は設定器11からの信号でパルス周波数、パルス
幅を規定される矩形波発生器12の出力信号に基づいて
駆動回路lOで制御され、所定の交流出力が溶接トーチ
13と母材14の間に印加される。The frequency and electrode plus time ratio (d) of the alternating current generated in the secondary inverter circuit 9 are the function generators 16 and d6. The function generators 16 and d6 generate a rectangular wave whose pulse frequency and pulse width are defined by the signal from the setting device 11. A predetermined alternating current output is applied between the welding torch 13 and the base material 14 under the control of the drive circuit IO based on the output signal of the welding torch 12 .
15はアーク電圧検出回路で、その検出値V、に基づい
て関数発生器16は、例えば第2図に示すようなアーク
電圧と交流周波数の所定の関係に従い、交流周波数を規
定する信号を矩形波発生器12に送る。Reference numeral 15 denotes an arc voltage detection circuit, and based on the detected value V, a function generator 16 generates a signal defining the AC frequency into a rectangular wave according to a predetermined relationship between the arc voltage and the AC frequency as shown in FIG. to generator 12.
このような構成とすることによって、アーク電圧の増減
に対応して交流周波数が自動的に変化し、溶込み深さを
所定の値に保ことができる。With such a configuration, the alternating current frequency is automatically changed in response to increases and decreases in arc voltage, and the penetration depth can be maintained at a predetermined value.
交流周波数は、第2図に示すような所定の関係に従いア
ーク電圧に略比例して変化させることが望ましいが、直
線近似あるいは段階的に変化させても略同様の効果が得
られる。Although it is desirable that the alternating current frequency be changed approximately in proportion to the arc voltage according to a predetermined relationship as shown in FIG. 2, substantially the same effect can be obtained by changing it by linear approximation or in steps.
本発明によれば。トーチ位置制御を行わなくても、交流
ティグ溶接における溶込み深さを所定の値に保つことが
できるため、スライドベースおよび駆動モータなどで構
成されるトーチ移動機構を省略することができる。According to the invention. Since the penetration depth in AC TIG welding can be maintained at a predetermined value without performing torch position control, a torch moving mechanism composed of a slide base, a drive motor, etc. can be omitted.
トーチ移動機構の省略は、溶接装置の簡略化とともに、
狭隘な場所で使用される固定管の自動溶接装置などを小
形・軽量化できるといった長所を持つことになる。The omission of the torch moving mechanism simplifies the welding equipment, and
It has the advantage of being able to make automatic welding equipment for fixed pipes used in confined spaces smaller and lighter.
第1図は本発明のティグ溶接方法を実施するための溶接
装置の構成例を示すブロック図、第2図は溶込み深さを
一定とするためのアーク電圧と交流周波数の関係の一例
を示す図、第3図および第4図は本発明の基になる現象
についての説明図である。
2・・・出力電流制御用−次インバータ回路、3・・・
パルス幅制御回路、4・・・誤差増幅器、7・・・電流
検出回路、8・・・出力電流設定器、9・・・交流出力
用二次インバータ回路、10・・・駆動回路、12・・
・矩形波発生器、13・・・溶接トーチ、14・・・母
材、15・・・アーク電圧検出回路、16・・・交流周
波数を規定する関数発生器。Fig. 1 is a block diagram showing an example of the configuration of a welding device for carrying out the TIG welding method of the present invention, and Fig. 2 shows an example of the relationship between arc voltage and AC frequency to maintain a constant penetration depth. FIG. 3, and FIG. 4 are explanatory diagrams of the phenomenon on which the present invention is based. 2... Output current control - next inverter circuit, 3...
Pulse width control circuit, 4... Error amplifier, 7... Current detection circuit, 8... Output current setting device, 9... Secondary inverter circuit for AC output, 10... Drive circuit, 12.・
- Rectangular wave generator, 13... Welding torch, 14... Base material, 15... Arc voltage detection circuit, 16... Function generator that defines AC frequency.
Claims (1)
することによって発生するアークを用いて母材を溶接す
る交流ティグ溶接において、前記交流出力の周波数をア
ーク電圧の増減に対応して変化させることを特徴とする
交流ティグ溶接方法。 2、交流出力の周波数を、アーク電圧に略比例して変化
させることを特徴とする請求項1記載の交流ティグ溶接
方法。 3、請求項1または2記載の方法を実施するために、直
流を可変周波数の交流に変換する手段、その交流周波数
が変化しても交流に変換される前の直流電流値を一定に
保つ手段、アーク電圧を検出する手段およびアーク電圧
と交流周波数の所定の関係に従いアーク電圧の検出値に
応じて前記直交変換手段の出力周波数を規定する手段を
備え、前記直交変換手段の交流出力を電極・母材間に印
加するようにした交流ティグ溶接装置。[Claims] 1. In AC TIG welding, in which base metals are welded using an arc generated by applying AC output of a welding power source between a non-consumable electrode and a base metal, the frequency of the AC output is set to An AC TIG welding method characterized by changes in response to increases and decreases in voltage. 2. The AC TIG welding method according to claim 1, wherein the frequency of the AC output is changed approximately in proportion to the arc voltage. 3. In order to carry out the method according to claim 1 or 2, means for converting direct current into alternating current with variable frequency, and means for keeping the value of the direct current constant before being converted to alternating current even if the alternating current frequency changes. , comprising means for detecting an arc voltage and means for defining an output frequency of the orthogonal transformation means according to a detected value of the arc voltage according to a predetermined relationship between the arc voltage and the AC frequency, the AC output of the orthogonal transformation means being connected to an electrode or AC TIG welding equipment that applies voltage between base materials.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13455489A JP2675624B2 (en) | 1989-05-30 | 1989-05-30 | AC TIG welding method and apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13455489A JP2675624B2 (en) | 1989-05-30 | 1989-05-30 | AC TIG welding method and apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03472A true JPH03472A (en) | 1991-01-07 |
JP2675624B2 JP2675624B2 (en) | 1997-11-12 |
Family
ID=15131037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13455489A Expired - Lifetime JP2675624B2 (en) | 1989-05-30 | 1989-05-30 | AC TIG welding method and apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2675624B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6630949B1 (en) | 1992-12-01 | 2003-10-07 | Canon Kabushiki Kaisha | Image processing system and information processing apparatus |
CN103182592A (en) * | 2011-12-28 | 2013-07-03 | 哈尔滨学兴科技开发有限公司 | Alternating current and direct current hybrid welding method and device |
US9093879B2 (en) | 2010-06-10 | 2015-07-28 | Mitsubishi Electric Corporation | Method and device for reducing concentrations of ozone and nitric acid generated in cooling air flowing through circulating airflow paths in rotary electric machines |
-
1989
- 1989-05-30 JP JP13455489A patent/JP2675624B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6630949B1 (en) | 1992-12-01 | 2003-10-07 | Canon Kabushiki Kaisha | Image processing system and information processing apparatus |
US7268800B2 (en) | 1992-12-01 | 2007-09-11 | Canon Kabushiki Kaisha | Image processing system and information processing apparatus |
US9093879B2 (en) | 2010-06-10 | 2015-07-28 | Mitsubishi Electric Corporation | Method and device for reducing concentrations of ozone and nitric acid generated in cooling air flowing through circulating airflow paths in rotary electric machines |
CN103182592A (en) * | 2011-12-28 | 2013-07-03 | 哈尔滨学兴科技开发有限公司 | Alternating current and direct current hybrid welding method and device |
Also Published As
Publication number | Publication date |
---|---|
JP2675624B2 (en) | 1997-11-12 |
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