JP2009072814A - Short circuiting arc welding method using alternating current consumable electrode - Google Patents
Short circuiting arc welding method using alternating current consumable electrode Download PDFInfo
- Publication number
- JP2009072814A JP2009072814A JP2007244603A JP2007244603A JP2009072814A JP 2009072814 A JP2009072814 A JP 2009072814A JP 2007244603 A JP2007244603 A JP 2007244603A JP 2007244603 A JP2007244603 A JP 2007244603A JP 2009072814 A JP2009072814 A JP 2009072814A
- Authority
- JP
- Japan
- Prior art keywords
- short
- circuit
- period
- polarity
- 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 98
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000000630 rising effect Effects 0.000 claims description 17
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000003321 amplification Effects 0.000 description 14
- 238000003199 nucleic acid amplification method Methods 0.000 description 14
- 238000001514 detection method Methods 0.000 description 11
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
Images
Abstract
Description
本発明は、電極プラス極性と電極マイナス極性とを交互に切り換えて溶接を行う交流消耗電極短絡アーク溶接において極性切り換えに伴う溶接状態の不安定を抑制するための交流消耗電極短絡アーク溶接方法に関するものである。 The present invention relates to an AC consumable electrode short-circuit arc welding method for suppressing instability of a welding state associated with polarity switching in AC consumable electrode short-circuit arc welding in which welding is performed by alternately switching between an electrode positive polarity and an electrode negative polarity. It is.
短絡アーク溶接は、消耗電極である溶接ワイヤを定速で送給すると共に、溶接ワイヤと母材との間で短絡期間とアーク期間とを繰り返しながら溶接が行われる。短絡期間中は予め定めた短絡電流波形パラメータに従って短絡電流を通電し、アーク期間中は溶接電源の定電圧特性に従ってアーク電流を通電する。短絡アーク溶接には、中電流域以下のＣＯ2溶接、ＭＡＧ溶接、ＭＩＧ溶接等が該当する。短絡アーク溶接は、通常は溶接ワイヤが陽極となり母材が陰極となる電極プラス極性で溶接が行われる。しかし、ワークが薄板でギャップの大きい場合には、電極プラス極性と電極マイナス極性とを交互に切り換えて溶接を行う交流消耗電極短絡アーク溶接方法が使用されることが多い。これは、交流消耗電極短絡アーク溶接方法では、電極プラス極性期間と電極マイナス極性期間との時間比率を調整することによって母材への入熱及びワイヤ溶着量を所望値に設定することができるので、ギャップのある薄板を高品質に溶接することができるからである。極性を切り換える周期は、０．２〜１０Ｈｚ程度である。 In short-circuit arc welding, a welding wire that is a consumable electrode is fed at a constant speed, and welding is performed while repeating a short-circuit period and an arc period between the welding wire and the base material. During the short-circuit period, the short-circuit current is energized according to a predetermined short-circuit current waveform parameter, and during the arc period, the arc current is energized according to the constant voltage characteristic of the welding power source. The short-circuit arc welding includes CO2 welding, MAG welding, MIG welding and the like in the middle current range or lower. In short-circuit arc welding, welding is usually performed with an electrode positive polarity in which the welding wire is the anode and the base material is the cathode. However, when the workpiece is a thin plate and has a large gap, an AC consumable electrode short-circuit arc welding method is often used in which welding is performed by alternately switching the electrode positive polarity and the electrode negative polarity. This is because, in the AC consumable electrode short-circuit arc welding method, the heat input to the base material and the amount of wire welding can be set to desired values by adjusting the time ratio between the electrode positive polarity period and the electrode negative polarity period. This is because a thin plate with a gap can be welded with high quality. The period for switching the polarity is about 0.2 to 10 Hz.
溶接中において極性を切り換えるためには、下記に説明する様々な工夫を行う必要がある。溶接中に極性を切り換える場合において、その切換タイミングがアーク状態であると、極性切換時にアーク切れが発生して不良な溶接になってしまう。このアーク切れを防止するために、極性切換時に数百Ｖの高電圧を印加する必要がある。この高電圧印加回路は回路構成が複雑であるために高価であり、かつ、大型であるという問題を有している。この問題を短絡アーク溶接において解決するために提案されたのが、以下に説明する従来技術（特許文献１、２参照）である。この従来技術では、溶接中の極性切り換えを必ず短絡期間において行うものである。アーク期間ではないのでアーク切れが発生する心配はない。このために、上記の高電圧印加回路も不要となる。以下、この従来技術について図面を参照して説明する。
In order to switch the polarity during welding, it is necessary to devise various ideas described below. When the polarity is switched during welding, if the switching timing is in an arc state, an arc break occurs during polarity switching, resulting in poor welding. In order to prevent this arc break, it is necessary to apply a high voltage of several hundred volts when switching the polarity. This high voltage application circuit has a problem that it is expensive and large because of its complicated circuit configuration. In order to solve this problem in short-circuit arc welding, the conventional techniques described below (see
図３は、従来技術の交流消耗電極短絡アーク溶接方法における電圧・電流波形図である。同図（Ａ）は極性切換信号Ｓａを示し、同図（Ｂ）は極性切換開始信号Ｓｂを示し、同図（Ｃ）は溶接ワイヤと母材との間の電圧である溶接電圧ｖを示し、同図（Ｄ）はアーク／短絡負荷を通電する溶接電流ｉを示す。同図において、ＥＰとは電極プラス極性を示し、ＥＮとは電極マイナス極性を示す。以下、同図を参照して説明する。 FIG. 3 is a voltage / current waveform diagram in the conventional AC consumable electrode short-circuit arc welding method. (A) shows the polarity switching signal Sa, (B) shows the polarity switching start signal Sb, and (C) shows the welding voltage v, which is the voltage between the welding wire and the base metal. FIG. 4D shows the welding current i for energizing the arc / short-circuit load. In the figure, EP indicates the positive polarity of the electrode, and EN indicates the negative polarity of the electrode. Hereinafter, a description will be given with reference to FIG.
短絡期間Ｔｓ中は、同図（Ｃ）に示すように、溶接電圧ｖは数Ｖ程度の短絡電圧値となり、同図（Ｄ）に示すように、溶接電流ｉは予め定めた短絡電流波形パラメータに従って通電する。すなわち、短絡が発生すると、短絡電流を予め定めた短絡初期期間Ｔｉ中は小電流値（数十Ａ）の予め定めた短絡初期電流値Ｉｉにアーク電流から減少させ、その後は予め定めた上昇特性Ｃｕに従って増加させ、これでも短絡が解除しないときは短絡発生から予め定めた短絡解除期間Ｔｋが経過した後は大電流値（400〜600Ａ程度）の予め定めた短絡解除電流値Ｉｋに急増させる。したがって、上記の短絡電流波形パラメータは、短絡初期期間Ｔｉ、短絡初期電流値Ｉｉ、上昇特性Ｃｕ、短絡解除期間Ｔｋ及び短絡解除電流値Ｉｋから形成される。短絡電流波形パラメータは、短絡期間Ｔｓ中の短絡電流の波形を定義するためのものであるので、同図に示した以外にも種々なパラメータの設定方法がある。短絡電流波形パラメータは出力極性おとに適正値に設定される。したがって、短絡電流波形パラメータの一部又は全部は、電極プラス極性期間Ｔepと電極マイナス極性期間Ｔenとは異なった値になる。この短絡期間Ｔｓ中は、短絡電流波形パラメータに従った短絡電流を通電するために、溶接電源は定電流特性となる。 During the short-circuit period Ts, the welding voltage v is a short-circuit voltage value of about several volts as shown in FIG. 5C, and the welding current i is a predetermined short-circuit current waveform parameter as shown in FIG. Energize according to. That is, when a short-circuit occurs, the short-circuit current is decreased from the arc current to a predetermined short-circuit initial current value Ii having a small current value (several tens of A) during a predetermined short-circuit initial period Ti, and thereafter, a predetermined increase characteristic If the short-circuit is not released even after the short-circuit is released, it is rapidly increased to a predetermined short-circuit release current value Ik having a large current value (about 400 to 600 A) after a predetermined short-circuit release period Tk has elapsed since the occurrence of the short-circuit. Accordingly, the short-circuit current waveform parameter is formed from the short-circuit initial period Ti, the short-circuit initial current value Ii, the rising characteristic Cu, the short-circuit release period Tk, and the short-circuit release current value Ik. The short-circuit current waveform parameter is for defining a short-circuit current waveform during the short-circuit period Ts, and there are various parameter setting methods other than those shown in FIG. The short-circuit current waveform parameter is set to an appropriate value for each output polarity. Therefore, some or all of the short-circuit current waveform parameters have different values in the electrode positive polarity period Tep and the electrode negative polarity period Ten. During this short-circuit period Ts, the short-circuit current according to the short-circuit current waveform parameter is supplied, so that the welding power source has a constant current characteristic.
短絡電流パラメータは、アーク期間Ｔａ中に溶接ワイヤ先端に形成された溶滴を短絡期間Ｔｓ中に円滑に溶融池に移行させるために適正値に設定される。溶滴の下端部が溶融池に接触すると短絡が発生する。この状態をより確実な短絡状態に導くために、短絡初期期間Ｔｉを設けて短絡初期電流Ｉｉを通電する。その後は上昇特性Ｃｕに従って短絡電流を増加させて短絡解除に導く。この上昇特性Ｃｕが急勾配過ぎると短絡解除時に大粒のスパッタが発生してビード外観が悪くなる。他方、この上昇特性Ｃｕが緩やかな勾配過ぎると短絡が解除されずに不安定な溶接状態になる。１秒間に３０〜８０回程度発生する短絡は、ほとんどこの上昇特性Ｃｕの短絡電流が通電しているときに解除されてアークが発生する。しかし、ワイヤ送給速度の変動、溶融池の不規則な運動、トーチ高さの変動等の外乱によって溶滴サイズが大きくなる場合がときたま生じる。このようなときには、上昇特性Ｃｕの短絡電流の通電では短絡が解除できない場合がある。このときは、短絡発生時点から短絡解除期間Ｔｋが経過した後は短絡解除電流Ｉｋを通電して強制的な短絡解除を行う。短絡電流波形パラメータを出力極性に応じて異なった値に設定する理由は、出力極性によって溶滴サイズが大きく異なるためである。すなわち、電極プラス極性期間Ｔep中はワイヤ直径よりも少し大きい程度の溶滴サイズになる。他方、電極マイナス極性期間Ｔen中の溶滴サイズは、電極プラス極性期間Ｔepよりも約２倍程度大きくなり、かつ、そのサイズが大きく変動する。このために、電極マイナス極性期間Ｔen中の短絡電流波形パラメータは、電極プラス極性期間Ｔep中に比べて以下のように設定される。すなわち、上昇特性Ｃｕは急勾配に、短絡解除期間Ｔｋは短く、短絡解除電流値Ｉｋは大きく設定される。 The short-circuit current parameter is set to an appropriate value in order to smoothly transfer the droplet formed on the welding wire tip during the arc period Ta to the molten pool during the short-circuit period Ts. A short circuit occurs when the lower end of the droplet contacts the molten pool. In order to lead this state to a more reliable short-circuit state, a short-circuit initial period Ti is provided to supply a short-circuit initial current Ii. Thereafter, the short-circuit current is increased according to the rising characteristic Cu, and the short-circuit is released. If this rising characteristic Cu is too steep, large spatters are generated when the short circuit is released and the bead appearance is deteriorated. On the other hand, if the rising characteristic Cu is too gentle, the short circuit is not released and an unstable welding state is obtained. Short-circuits that occur about 30 to 80 times per second are almost canceled when the short-circuit current of the rising characteristic Cu is energized, and an arc is generated. However, sometimes the droplet size increases due to disturbances such as fluctuations in the wire feed speed, irregular movement of the molten pool, fluctuations in the torch height, and the like. In such a case, the short circuit may not be released by energizing the short circuit current of the rising characteristic Cu. At this time, after the short-circuit release period Tk has elapsed since the occurrence of the short-circuit, the short-circuit release current Ik is energized to forcibly release the short-circuit. The reason for setting the short-circuit current waveform parameter to a different value depending on the output polarity is that the droplet size varies greatly depending on the output polarity. That is, the droplet size is slightly larger than the wire diameter during the electrode positive polarity period Tep. On the other hand, the droplet size during the electrode minus polarity period Ten is about twice as large as the electrode plus polarity period Tep, and the size fluctuates greatly. For this reason, the short-circuit current waveform parameter during the electrode negative polarity period Ten is set as follows compared to during the electrode positive polarity period Tep. That is, the rising characteristic Cu is set to be steep, the short-circuit release period Tk is short, and the short-circuit release current value Ik is set to be large.
次に、アーク期間Ｔａ中は、同図（Ｃ）に示すように、溶接電圧ｖは数十Ｖ程度のアーク電圧値となり、同図（Ｄ）に示すように、溶接電流ｉはアーク電流となり次第に減少する。アーク期間Ｔａ中は溶接電源は定電圧特性になるので、このアーク電流は定電圧特性とアーク負荷との関係によって変化する。アーク期間Ｔａ中は定電圧特性に設定される理由は、アーク長を適正値に制御するためである。 Next, during the arc period Ta, the welding voltage v becomes an arc voltage value of about several tens of volts as shown in FIG. 3C, and the welding current i becomes the arc current as shown in FIG. It gradually decreases. Since the welding power source has a constant voltage characteristic during the arc period Ta, the arc current varies depending on the relationship between the constant voltage characteristic and the arc load. The reason why the constant voltage characteristic is set during the arc period Ta is to control the arc length to an appropriate value.
時刻ｔ１において、同図（Ａ）に示すように、極性切換信号Ｓａが変化すると、これに応動して同図（Ｂ）に示すように、極性切換開始信号Ｓｂは時刻ｔ１以降の最初の短絡が時刻ｔ２で発生した後の短絡初期期間Ｔｉが経過した時刻ｔ３において変化する。これに応動して、同図（Ｃ）に示す溶接電圧ｖ及び同図（Ｄ）に示す溶接電流ｉの極性は、電極プラス極性ＥＰから電極マイナス極性ＥＮへと切り換わる。電極マイナス極性ＥＮから電極プラス極性ＥＰに切り換わるときも同図と同様に行う。同図では、極性切換タイミングを短絡初期期間Ｔｉが経過した時点としているが、短絡期間Ｔｓ又は短絡初期期間Ｔｉ中の任意の時点で行っても良い。 When the polarity switching signal Sa changes at time t1, as shown in FIG. 5A, the polarity switching start signal Sb is first short-circuited after time t1, as shown in FIG. Changes at time t3 when the short-circuit initial period Ti after occurrence of time t2 has elapsed. In response to this, the polarity of the welding voltage v shown in FIG. 6C and the welding current i shown in FIG. 4D is switched from the electrode positive polarity EP to the electrode negative polarity EN. The same operation is performed when the electrode negative polarity EN is switched to the electrode positive polarity EP. In the figure, the polarity switching timing is the time when the short-circuit initial period Ti has elapsed, but it may be performed at any time during the short-circuit period Ts or the short-circuit initial period Ti.
上述した従来技術では、図３に示すように、極性切換タイミングは短絡期間Ｔｓ中となる。時刻ｔ３において極性が切り換わると、それに伴って短絡電流波形パラメータも切り換わる。上述したように、短絡電流波形パラメータの値は、アーク期間Ｔａ中に形成された溶滴を円滑に移行うさせるように設定される。時刻ｔ２において溶融池と接触する溶滴はそれ以前のアーク期間Ｔａ中に形成されたものである。したがって、時刻ｔ２時点での溶滴は電極プラス極性ＥＰで形成されたものであるのでそのサイズは小さい。しかし、時刻ｔ３において短絡電流波形パラメータは電極マイナス極性ＥＮ用の値に切り換わるために、小さなサイズの溶滴に対しては不適合であり、大粒のスパッタが発生しビード外観が悪くなる。このようになる理由は、電極プラス極性ＥＰで形成された溶滴が電極マイナス極性ＥＮ用の短絡電流波形パラメータ値によって移行させられるためである。電極マイナス極性ＥＮから電極プラス極性ＥＰに切り換わるときも同様に溶接状態が不安定になる。すなわち、電極マイナス極性ＥＮのアーク期間Ｔａで形成された大きなサイズの溶滴を、電極プラス極性ＥＰ用の短絡電流波形パラメータ値によって移行させるために短絡解除に長い時間がかかり溶接状態が不安定になる。 In the prior art described above, as shown in FIG. 3, the polarity switching timing is during the short circuit period Ts. When the polarity is switched at time t3, the short-circuit current waveform parameter is switched accordingly. As described above, the value of the short-circuit current waveform parameter is set so that the droplets formed during the arc period Ta are transferred smoothly. The droplet that contacts the molten pool at time t2 is formed during the previous arc period Ta. Therefore, since the droplet at time t2 is formed with the electrode plus polarity EP, its size is small. However, since the short-circuit current waveform parameter is switched to the value for the electrode negative polarity EN at time t3, it is incompatible with small-sized droplets, large spatter is generated, and the bead appearance is deteriorated. The reason for this is that the droplet formed with the electrode positive polarity EP is shifted by the short-circuit current waveform parameter value for the electrode negative polarity EN. Similarly, when the electrode minus polarity EN is switched to the electrode plus polarity EP, the welding state becomes unstable. That is, it takes a long time to release the short circuit to make the large size droplet formed in the arc period Ta of the electrode negative polarity EN shift by the short circuit current waveform parameter value for the electrode positive polarity EP, and the welding state becomes unstable. Become.
そこで、本発明は、極性切換に伴う溶滴移行状態の不安定を抑制することができる交流消耗電極短絡アーク溶接方法を提供することを目的とする。 Then, an object of this invention is to provide the alternating current consumable electrode short circuit arc welding method which can suppress instability of the droplet transfer state accompanying polarity switching.
上述した課題を解決するために、第１の発明は、
溶接ワイヤを送給すると共に、予め定めた短絡電流波形パラメータに従った短絡電流が通電する短絡期間と予め定めた定電圧特性に従ったアーク電流が通電するアーク期間とを繰り返す短絡アーク溶接にあって、
溶接電源の出力極性を電極プラス極性と電極マイナス極性とに前記短絡期間中の所定極性切換タイミングで交互に切り換え、前記短絡電流波形パラメータを前記電極プラス極性期間と電極マイナス極性期間とで異なる値に設定して溶接を行う交流消耗電極短絡アーク溶接方法において、
前記短絡電流波形パラメータは、出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生した後に各出力極性に対応した値に切り換わる、ことを特徴とする交流消耗電極短絡アーク溶接方法である。
In order to solve the above-described problem, the first invention
It is suitable for short-circuit arc welding that feeds a welding wire and repeats a short-circuit period in which a short-circuit current is applied according to a predetermined short-circuit current waveform parameter and an arc period in which an arc current is applied according to a predetermined constant voltage characteristic. And
The output polarity of the welding power source is alternately switched between an electrode positive polarity and an electrode negative polarity at a predetermined polarity switching timing during the short circuit period, and the short circuit current waveform parameter is set to a different value between the electrode positive polarity period and the electrode negative polarity period. In the AC consumable electrode short-circuit arc welding method of setting and welding,
The alternating current consumable electrode short circuit arc welding method, wherein the short circuit current waveform parameter is switched to a value corresponding to each output polarity after the output polarity is switched during the short circuit period and the short circuit is released and an arc is generated. It is.
第２の発明は、短絡が発生すると、短絡電流を予め定めた短絡初期期間中は小電流値の予め定めた短絡初期電流値に減少させ、その後は予め定めた上昇特性に従って増加させ、短絡発生後予め定めた短絡解除期間が経過すると大電流値の予め定めた短絡解除電流値に急増させて短絡を解除させ、
前記短絡電流波形パラメータとして、前記上昇特性、前記短絡解除期間又は前記短絡解除電流値の少なくとも１つ以上を設定する、ことを特徴とする第１の発明記載の交流消耗電極短絡アーク溶接方法である。
According to a second aspect of the present invention, when a short circuit occurs, the short circuit current is decreased to a predetermined short circuit initial current value during a predetermined initial short circuit period, and thereafter increased according to a predetermined rising characteristic to generate a short circuit. After the predetermined short-circuit release period has elapsed, the short-circuit is released by rapidly increasing to a predetermined short-circuit release current value of a large current value,
The AC consumable electrode short-circuit arc welding method according to the first aspect of the invention, wherein at least one of the rising characteristic, the short-circuit release period, or the short-circuit release current value is set as the short-circuit current waveform parameter. .
第３の発明は、前記極性切換タイミングが前記短絡初期期間中である、ことを特徴とする第２の発明記載の交流消耗電極短絡アーク溶接方法である。 A third invention is the AC consumable electrode short-circuit arc welding method according to the second invention, wherein the polarity switching timing is during the short-circuit initial period.
第４の発明は、前記短絡電流波形パラメータは、出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生してから所定期間経過後に各出力極性に対応した値に切り換わる、ことを特徴とする第１〜第３の発明のいずれか１項に記載の交流消耗電極短絡アーク溶接方法である。 According to a fourth aspect of the invention, the short circuit current waveform parameter is switched to a value corresponding to each output polarity after a predetermined period has elapsed after the output polarity is switched during the short circuit period and the short circuit is released and an arc is generated. An AC consumable electrode short-circuit arc welding method according to any one of the first to third inventions.
第５の発明は、前記短絡電流波形パラメータは、出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生してから所定回数の短絡が発生した時点で各出力極性に対応した値に切り換わる、ことを特徴とする第１〜第３の発明のいずれか１項に記載の交流消耗電極短絡アーク溶接方法である。 According to a fifth aspect of the invention, the short-circuit current waveform parameter is a value corresponding to each output polarity when the output polarity is switched during the short-circuit period and the short-circuit is released and an arc is generated a predetermined number of times. The AC consumable electrode short-circuit arc welding method according to any one of the first to third inventions, wherein
上記第１の発明によれば、短絡電流波形パラメータは出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生した後に各出力極性に対応した値に切り換わる。このために、極性切換前に形成された溶滴が極性切換後もその溶滴サイズに適合した短絡電流波形パラメータに従った短絡電流によって溶滴移行が行われるので、安定した溶滴移行となり、良好な溶接品質を得ることができる。 According to the first invention, the output polarity of the short-circuit current waveform parameter is switched during the short-circuit period, and after the short-circuit is released and an arc is generated, the short-circuit current waveform parameter is switched to a value corresponding to each output polarity. For this reason, since the droplet formed before the polarity switching is performed by the short-circuit current according to the short-circuit current waveform parameter suitable for the droplet size even after the polarity switching, the droplet transfer is stable, Good welding quality can be obtained.
上記第２の発明によれば、短絡が発生すると、短絡電流を予め定めた短絡初期期間中は小電流値の予め定めた短絡初期電流値に減少させ、その後は予め定めた上昇特性に従って増加させ、短絡発生後予め定めた短絡解除期間が経過すると大電流値の予め定めた短絡解除電流値に急増させて短絡を解除させる場合において、
短絡電流波形パラメータとして上昇特性、短絡解除期間又は短絡解除電流値の少なくとも１つ以上を設定することによって、上記の効果を奏することができる。
According to the second aspect of the present invention, when a short circuit occurs, the short circuit current is reduced to a predetermined short circuit initial current value with a small current value during a predetermined initial short circuit period, and thereafter increased according to a predetermined rising characteristic. When a predetermined short-circuit release period elapses after the occurrence of a short-circuit, when the short-circuit is released by rapidly increasing to a predetermined short-circuit release current value of a large current value,
By setting at least one of the rising characteristic, the short-circuit release period, or the short-circuit release current value as the short-circuit current waveform parameter, the above effect can be obtained.
第３の発明によれば、極性切換タイミングが短絡初期期間中であるときは、小電流の状態で極性を切り換えることができるので、極性切換用スイッチング素子へのサージ電圧の印加を抑制することができる。このために溶接電源の信頼性を向上させることができる。 According to the third invention, when the polarity switching timing is in the initial short-circuit period, the polarity can be switched in a small current state, so that the application of the surge voltage to the polarity switching switching element can be suppressed. it can. For this reason, the reliability of the welding power source can be improved.
第４の発明によれば、短絡電流波形パラメータを、出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生してから所定期間経過後に各出力極性に対応した値に切り換えるようにしている。極性切換後のしばらくの間は、極性切換前に溶接ワイヤに蓄積された熱量のために溶滴形成が影響される場合がある。このために、極性切換後の短絡が解除されてから所定期間の間は極性切換前の短絡電流波形パラメータ値を使用することによって、安定した溶滴移行を行うことができる。 According to the fourth invention, the short-circuit current waveform parameter is switched to a value corresponding to each output polarity after the elapse of a predetermined period after the output polarity is switched during the short-circuit period and the short-circuit is released and the arc is generated. ing. For some time after polarity switching, droplet formation may be affected by the amount of heat stored in the welding wire before polarity switching. For this reason, stable droplet transfer can be performed by using the short-circuit current waveform parameter value before polarity switching for a predetermined period after the short-circuit after polarity switching is released.
第５の発明によれば、短絡電流波形パラメータを、出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生してから所定回数の短絡が発生したときに各出力極性に対応した値に切り換えるようにしている。極性切換後のしばらくの間は、極性切換前に溶接ワイヤに蓄積された熱量のために溶滴形成が影響される場合がある。このために、極性切換後の短絡が解除されてから所定回数の短絡が発生するまでの間は極性切換前の短絡電流波形パラメータ値を使用することによって、安定した溶滴移行を行うことができる。 According to the fifth aspect of the invention, the short-circuit current waveform parameter corresponds to each output polarity when the output polarity is switched during the short-circuit period and the short-circuit is released and an arc is generated a predetermined number of times. Switch to the value. For some time after polarity switching, droplet formation may be affected by the amount of heat stored in the welding wire before polarity switching. For this reason, stable droplet transfer can be performed by using the short-circuit current waveform parameter value before polarity switching after the short-circuit after polarity switching is released until a predetermined number of short-circuits occur. .
以下、図面を参照して本発明の実施の形態について説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図１は、本発明の実施の形態に係る交流消耗電極短絡アーク溶接方法を示すタイミングチャートである。同図（Ａ）は極性切換信号Ｓａを示し、同図（Ｂ）は極性切換開始信号Ｓｂを示し、同図（Ｃ）は溶接電圧ｖを示し、同図（Ｄ）は溶接電流ｉを示し、同図（Ｅ）はパラメータ切換信号Ｓｐを示す。同図は上述した図３と対応しており、以下異なる点について同図を参照して説明する。 FIG. 1 is a timing chart showing an AC consumable electrode short-circuit arc welding method according to an embodiment of the present invention. (A) shows the polarity switching signal Sa, (B) shows the polarity switching start signal Sb, (C) shows the welding voltage v, and (D) shows the welding current i. FIG. 5E shows the parameter switching signal Sp. The figure corresponds to FIG. 3 described above, and different points will be described below with reference to the figure.
同図（Ｄ）に示すように、短絡電流波形パラメータは、電極プラス極性ＥＰのときは（短絡初期期間Ｔip，短絡初期電流値Ｉip，上昇特性Ｃup，短絡解除期間Ｔkp，短絡解除電流値Ｉkp）から形成され、電極マイナス極性ＥＮのときは（短絡初期期間Ｔin，短絡初期電流値Ｉin，上昇特性Ｃun，短絡解除期間Ｔkn，短絡解除電流値Ｉkn）から形成される。極性によって、上昇特性、短絡解除期間又は短絡解除電流値の少なくとも１つ以上は異なった値に設定される。 As shown in FIG. 4D, when the short-circuit current waveform parameter is the electrode plus polarity EP (short-circuit initial period Tip, short-circuit initial current value Iip, rising characteristic Cup, short-circuit release period Tkp, short-circuit release current value Ikp) When the electrode has a negative polarity EN, it is formed from (short-circuit initial period Tin, short-circuit initial current value Iin, rising characteristic Cun, short-circuit release period Tkn, short-circuit release current value Ikn). Depending on the polarity, at least one of the rising characteristic, the short-circuit release period, or the short-circuit release current value is set to a different value.
時刻ｔ１において、同図（Ａ）に示すように、、極性切換信号Ｓａが変化し、最初の短絡が発生して短絡初期期間Ｔipが経過した時点（ｔ３）ににおいて、同図（Ｂ）に示すように、極性切換開始信号Ｓｂが変化する。これに応動して、同図（Ｃ）に示すように、電極プラス極性ＥＰから電極マイナス極性ＥＮに切り換わる。同図（Ｄ）に示すように、時刻ｔ２に短絡が発生し、短絡初期期間Ｔipに入るために短絡電流は短絡初期電流値Ｉipになる。この短絡初期電流値Ｉipは数十Ａ程度の小さな値であるので、後述する極性切換用スイッチング素子（図２のＰＴＲ及びＮＴＲ）へのサージ電圧の印加が小さくなり負担が抑制される。短絡期間Ｔｓ中に極性を切り換えているので、アーク切れの心配は不要であり安定した極性切換を行うことができる。 At time t1, as shown in FIG. 6A, the polarity switching signal Sa changes, and at the time (t3) when the initial short circuit occurs and the initial short circuit period Tip has elapsed, the circuit shown in FIG. As shown, the polarity switching start signal Sb changes. In response to this, as shown in FIG. 5C, the electrode positive polarity EP is switched to the electrode negative polarity EN. As shown in FIG. 4D, a short circuit occurs at time t2, and since the short circuit initial period Tip is entered, the short circuit current becomes the short circuit initial current value Iip. Since the short-circuit initial current value Iip is a small value of about several tens of A, application of a surge voltage to a polarity switching switching element (PTR and NTR in FIG. 2) to be described later is reduced and the burden is suppressed. Since the polarity is switched during the short-circuit period Ts, there is no need to worry about arc breakage and stable polarity switching can be performed.
時刻ｔ４において極性切換後の最初の短絡が解除されると、同図（Ｅ）に示すように、パラメータ切換信号Ｓｐが変化する。これに応動して、短絡電流波形パラメータは、上述した電極プラス極性ＥＰ用の値から電極マイナス極性ＥＮ用の値に切り換わる。このために、時刻ｔ２からの最初の短絡期間Ｔｓ中は電極プラス極性ＥＰ用の短絡電流波形パラメータ値になる。したがって、極性切換前に電極プラス極性ＥＰで形成された溶滴が、極性切換後も電極プラス極性ＥＰ用の短絡電流波形パラメータ値で移行させられることになり、安定した溶滴移行を行うことができる。電極マイナス極性ＥＮから電極プラス極性ＥＰに切り換えるときも同様に安定した溶滴移行を行うことができる。 When the first short circuit after polarity switching is released at time t4, the parameter switching signal Sp changes as shown in FIG. In response to this, the short-circuit current waveform parameter switches from the value for the electrode positive polarity EP described above to the value for the electrode negative polarity EN. For this reason, during the first short-circuit period Ts from time t2, the short-circuit current waveform parameter value for the electrode plus polarity EP is obtained. Therefore, the droplet formed with the electrode plus polarity EP before the polarity switching is transferred with the short-circuit current waveform parameter value for the electrode plus polarity EP even after the polarity switching, and stable droplet transfer can be performed. it can. Similarly, when the electrode minus polarity EN is switched to the electrode plus polarity EP, stable droplet transfer can be performed.
同図においては、極性切換後の最初の短絡が解除される時点で短絡電流波形パラメータ値を切り換える場合を例示した。これ以外にも、最初の短絡が解除されてアークが発生してから所定期間経過した時点で短絡電流波形パラメータ値を切り換えても良い。また、最初の短絡が解除されてアークが発生した後に所定回数の短絡が解除された時点で短絡電流波形パラメータ値を切り換えるようにしても良い。 In the figure, the case where the short-circuit current waveform parameter value is switched when the first short circuit after the polarity switching is released is illustrated. In addition to this, the short-circuit current waveform parameter value may be switched when a predetermined period elapses after the first short circuit is released and the arc is generated. Alternatively, the short-circuit current waveform parameter value may be switched when a predetermined number of short-circuits are released after the first short-circuit is released and an arc is generated.
図２は、上述した実施の形態に係る交流消耗電極短絡アーク溶接方法を実施するための溶接電源のブロック図である。以下、同図を参照して各ブロックについて説明する。 FIG. 2 is a block diagram of a welding power source for carrying out the AC consumable electrode short-circuit arc welding method according to the above-described embodiment. Hereinafter, each block will be described with reference to FIG.
インバータ回路ＩＮＶは、交流商用電源ＡＣ（３相２００Ｖ等）を入力として整流し、後述する誤差増幅信号Ｅａに従ってインバータ制御によって高周波交流を出力する。高周波トランスＩＮＴは、高周波交流をアーク溶接に適した電圧値へと降圧した高周波交流を出力する。２次側ダイオードＤ２ａ〜Ｄ２ｄは、降圧された高周波交流を直流に整流する。電極プラス極性スイッチング素子ＰＴＲは、後述する電極プラス極性スイッチング素子駆動信号Ｐｄに従ってオン／オフされ、オン状態のときは電極プラス極性ＥＰになる。電極マイナス極性スイッチング素子ＮＴＲは、後述する電極マイナス極性スイッチング素子駆動信号Ｎｄに従ってオン／オフされ、オン状態のときは電極マイナス極性ＥＮになる。リアクトルＷＬは、整流されたリップルのある直流を平滑する。溶接ワイヤ１はワイヤ送給装置の送給ロール５によって溶接トーチ４内を通って送給され、母材２との間にアーク３が発生する。
The inverter circuit INV rectifies using an AC commercial power supply AC (three-phase 200 V or the like) as an input, and outputs high-frequency AC by inverter control according to an error amplification signal Ea described later. The high frequency transformer INT outputs a high frequency alternating current obtained by stepping down the high frequency alternating current to a voltage value suitable for arc welding. The secondary side diodes D2a to D2d rectify the stepped-down high-frequency alternating current into direct current. The electrode positive polarity switching element PTR is turned on / off in accordance with an electrode positive polarity switching element drive signal Pd described later, and has an electrode positive polarity EP when in the on state. The electrode negative polarity switching element NTR is turned on / off in accordance with an electrode negative polarity switching element drive signal Nd, which will be described later, and becomes the electrode negative polarity EN when in the on state. The reactor WL smoothes the rectified rippled direct current. The
電圧検出回路ＶＤは、交流の溶接電圧ｖを検出し絶対値に変換して、電圧検出信号Ｖｄを出力する。短絡判別回路ＳＤは、この電圧検出信号Ｖｄの値によって短絡期間とアーク期間とを判別し、短絡期間のときはＨｉｇｈレベルとなりアーク期間のときはＬｏｗレベルとなる短絡判別信号Ｓｄを出力する。電流検出回路ＩＤは、交流の溶接電流ｉを検出し絶対値に変換して、電流検出信号Ｉｄを出力する。 The voltage detection circuit VD detects an AC welding voltage v, converts it to an absolute value, and outputs a voltage detection signal Vd. The short circuit determination circuit SD determines a short circuit period and an arc period based on the value of the voltage detection signal Vd, and outputs a short circuit determination signal Sd that is High level during the short circuit period and Low level during the arc period. The current detection circuit ID detects an AC welding current i, converts it to an absolute value, and outputs a current detection signal Id.
極性切換信号生成回路ＳＡは、予め定めた電極プラス極性期間Ｔepの間はＨｉｇｈレベルになり予め定めた電極マイナス極性期間Ｔenの間はＬｏｗレベルになる極性切換信号Ｓａを出力する。極性切換開始信号生成回路ＳＢは、この極性切換信号Ｓａが変化した後に後述する短絡初期期間終了信号Ｓtiが入力された時点で変化する極性切換開始信号Ｓｂを出力する。駆動回路Ｄｖは、この極性切換開始信号ＳｂがＨｉｇｈレベルのときは電極プラス極性スイッチング素子ＰＴＲを駆動するための電極プラス極性スイッチング素子駆動信号Ｐｄを出力し、Ｌｏｗレベルのときは電極マイナス極性スイッチング素子ＮＴＲを駆動するための電極マイナス極性スイッチング素子駆動信号Ｎｄを出力する。 The polarity switching signal generation circuit SA outputs a polarity switching signal Sa that is at a high level during a predetermined electrode plus polarity period Tep and is at a low level during a predetermined electrode minus polarity period Ten. The polarity switching start signal generation circuit SB outputs a polarity switching start signal Sb that changes when a short-circuit initial period end signal Sti described later is input after the polarity switching signal Sa changes. The drive circuit Dv outputs an electrode positive polarity switching element drive signal Pd for driving the electrode positive polarity switching element PTR when the polarity switching start signal Sb is High level, and the electrode minus polarity switching element when the polarity switching start signal Sb is Low level. An electrode negative polarity switching element drive signal Nd for driving the NTR is output.
電極プラス極性用短絡電流波形パラメータ設定回路ＰＰＲは、予め定めた電極プラス極性用短絡電流波形パラメータ設定信号Ｐprを出力する。電極マイナス極性用短絡電流波形パラメータ設定回路ＰＮＲは、予め定めた電極マイナス極性用短絡電流波形パラメータ設定信号Ｐnrを出力する。ここで、Ｐpr＝（Ｔip，Ｉip，Ｃup，Ｔkp，Ｉkp）であり、Ｐnr＝（Ｔin，Ｉin，Ｃun，Ｔkn，Ｉkn）である。パラメータ切換信号生成回路ＳＰは、上記の極性切換開始信号Ｓｂが変化し、かつ、上記の短絡判別信号ＳｄがＬｏｗレベル（アーク期間）に変化した時点で変化するパラメータ切換信号Ｓｐを出力する。パラメータ切換回路ＳＷＰは、このパラメータ切換信号ＳｐがＨｉｇｈレベルのときは上記の電極プラス極性用短絡電流波形パラメータ設定信号Ｐprをパラメータ設定信号Ｐｒとして出力し、Ｌｏｗレベルのときは上記の電極マイナス極性用短絡電流波形パラメータ設定信号Ｐnrをパラメータ設定信号Ｐｒとして出力する。短絡電流設定回路ＩＲは、上記の短絡判別信号ＳｄがＨｉｇｈレベル（短絡期間）になった時点からこのパラメータ設定信号Ｐｒに従った短絡電流を通電するための短絡電流設定信号Ｉｒを出力する。この短絡電流波形パラメータによる短絡電流の通電については、図１で上述している。電流誤差増幅回路ＥＩは、上記の短絡電流設定信号Ｉｒと電流検出信号Ｉｄとの誤差を増幅して、電流誤差増幅信号Ｅｉを出力する。 The electrode positive polarity short circuit current waveform parameter setting circuit PPR outputs a predetermined electrode positive polarity short circuit current waveform parameter setting signal Ppr. The electrode negative polarity short-circuit current waveform parameter setting circuit PNR outputs a predetermined electrode negative polarity short-circuit current waveform parameter setting signal Pnr. Here, Ppr = (Tip, Iip, Cup, Tkp, Ikp) and Pnr = (Tin, Iin, Cun, Tkn, Ikn). The parameter switching signal generation circuit SP outputs a parameter switching signal Sp that changes when the polarity switching start signal Sb changes and the short circuit determination signal Sd changes to a low level (arc period). The parameter switching circuit SWP outputs the electrode positive polarity short-circuit current waveform parameter setting signal Ppr as the parameter setting signal Pr when the parameter switching signal Sp is High level, and the electrode negative polarity when the parameter switching signal Sp is Low level. The short-circuit current waveform parameter setting signal Pnr is output as the parameter setting signal Pr. The short-circuit current setting circuit IR outputs a short-circuit current setting signal Ir for supplying a short-circuit current according to the parameter setting signal Pr from the time when the short-circuit determination signal Sd becomes High level (short-circuit period). The short-circuit current energization based on the short-circuit current waveform parameter is described above with reference to FIG. The current error amplification circuit EI amplifies an error between the short-circuit current setting signal Ir and the current detection signal Id and outputs a current error amplification signal Ei.
電圧設定回路ＶＲは、予め定めた電圧設定信号Ｖｒを出力する。電圧誤差増幅回路ＥＶは、この電圧設定信号Ｖｒと上記の電圧検出信号Ｖｄとの誤差を増幅して電圧誤差増幅信号Ｅｖを出力する。外部特性切換回路ＳＷは、上記の短絡判別信号ＳｄがＨｉｇｈレベル（短絡期間）のときは上記の電流誤差増幅信号Ｅｉを誤差増幅信号Ｅａとして出力し、Ｌｏｗレベル（アーク期間）のときは上記の電圧誤差増幅信号Ｅｖを誤差増幅信号Ｅａとして出力する。したがって、溶接電源の外部特性は短絡期間中は定電流特性となり、アーク期間中は定電圧特性となる。上述したブロック構成によって、図１の各信号が出力されて交流の溶接電圧ｖ及び溶接電流ｉが通電する。 The voltage setting circuit VR outputs a predetermined voltage setting signal Vr. The voltage error amplification circuit EV amplifies an error between the voltage setting signal Vr and the voltage detection signal Vd and outputs a voltage error amplification signal Ev. The external characteristic switching circuit SW outputs the current error amplification signal Ei as the error amplification signal Ea when the short-circuit determination signal Sd is at a high level (short-circuit period), and when the short-circuit determination signal Sd is at a low level (arc period). The voltage error amplification signal Ev is output as the error amplification signal Ea. Accordingly, the external characteristics of the welding power source are constant current characteristics during the short circuit period and constant voltage characteristics during the arc period. With the block configuration described above, each signal in FIG. 1 is output, and the AC welding voltage v and the welding current i are applied.
上述した実施の形態によれば、短絡電流波形パラメータは出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生した後に各出力極性に対応した値に切り換わる。このために、極性切換前に形成された溶滴が極性切換後もその溶滴サイズに適合した短絡電流波形パラメータに従った短絡電流によって溶滴移行が行われるので、安定した溶滴移行となり、良好な溶接品質を得ることができる。 According to the embodiment described above, the output polarity of the short-circuit current waveform parameter is switched during the short-circuit period, and after the short-circuit is released and an arc is generated, the short-circuit current waveform parameter is switched to a value corresponding to each output polarity. For this reason, since the droplet formed before the polarity switching is performed by the short-circuit current according to the short-circuit current waveform parameter suitable for the droplet size even after the polarity switching, the droplet transfer is stable, Good welding quality can be obtained.
短絡が発生すると、短絡電流を予め定めた短絡初期期間中は小電流値の予め定めた短絡初期電流値に減少させ、その後は予め定めた上昇特性に従って増加させ、短絡発生後予め定めた短絡解除期間が経過すると大電流値の予め定めた短絡解除電流値に急増させて短絡を解除させる場合において、短絡電流波形パラメータとして上昇特性、短絡解除期間又は短絡解除電流値の少なくとも１つ以上を設定することによって、上記の効果を奏することができる。 When a short-circuit occurs, the short-circuit current is decreased to a predetermined short-circuit initial current value during a predetermined initial short-circuit period, and then increased according to a predetermined rising characteristic. In the case where the short-circuit is released by rapidly increasing to a predetermined short-circuit release current value with a large current value when the period has elapsed, at least one of a rising characteristic, a short-circuit release period, or a short-circuit release current value is set as a short-circuit current waveform parameter As a result, the above effects can be achieved.
極性切換タイミングが短絡初期期間中であるときは、小電流の状態で極性を切り換えることができるので、極性切換用スイッチング素子へのサージ電圧の印加を抑制することができる。このために溶接電源の信頼性を向上させることができる。 When the polarity switching timing is during the initial short-circuit period, the polarity can be switched in a small current state, so that application of a surge voltage to the polarity switching switching element can be suppressed. For this reason, the reliability of the welding power source can be improved.
短絡電流波形パラメータを、出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生してから所定期間経過後に各出力極性に対応した値に切り換えるようにしても良い。極性切換後のしばらくの間は、極性切換前に溶接ワイヤに蓄積された熱量のために溶滴形成が影響される場合がある。このために、極性切換後の短絡が解除されてから所定期間の間は極性切換前の短絡電流波形パラメータ値を使用することによって、安定した溶滴移行を行うことができる。この所定期間は、１０〜１００ms程度である。 The short-circuit current waveform parameter may be switched to a value corresponding to each output polarity after a predetermined period elapses after the output polarity is switched during the short-circuit period and the short-circuit is released and an arc is generated. For some time after polarity switching, droplet formation may be affected by the amount of heat stored in the welding wire before polarity switching. For this reason, stable droplet transfer can be performed by using the short-circuit current waveform parameter value before polarity switching for a predetermined period after the short-circuit after polarity switching is released. This predetermined period is about 10 to 100 ms.
短絡電流波形パラメータを、出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生してから所定回数の短絡が発生したときに各出力極性に対応した値に切り換えるようにしても良い。極性切換後のしばらくの間は、極性切換前に溶接ワイヤに蓄積された熱量のために溶滴形成が影響される場合がある。このために、極性切換後の短絡が解除されてから所定回数の短絡が発生するまでの間は極性切換前の短絡電流波形パラメータ値を使用することによって、安定した溶滴移行を行うことができる。この所定回数は、１〜１０回程度である。 The short-circuit current waveform parameter may be switched to a value corresponding to each output polarity when the output polarity is switched during the short-circuit period and a short-circuit occurs a predetermined number of times after the short-circuit is released and an arc is generated. . For some time after polarity switching, droplet formation may be affected by the amount of heat stored in the welding wire before polarity switching. For this reason, stable droplet transfer can be performed by using the short-circuit current waveform parameter value before polarity switching after the short-circuit after polarity switching is released until a predetermined number of short-circuits occur. . This predetermined number of times is about 1 to 10 times.
１ 溶接ワイヤ
2 母材
3 アーク
4 溶接トーチ
5 送給ロール
ＡＣ 交流商用電源
Ｃｕ 上昇特性
Ｃun 電極マイナス極性用上昇特性
Ｃup 電極プラス極性用上昇特性
Ｄ２ａ〜Ｄ２ｄ ２次側ダイオード
Ｄｖ 駆動回路
Ｅａ 誤差増幅信号
ＥＩ 電流誤差増幅回路
Ｅｉ 電流誤差増幅信号
ＥＮ 電極マイナス極性
ＥＰ 電極プラス極性
ＥＶ 電圧誤差増幅回路
Ｅｖ 電圧誤差増幅信号
ｉ 溶接電流
ＩＤ 電流検出回路
Ｉｄ 電流検出信号
Ｉｉ 短絡初期電流
Ｉin 電極マイナス極性用短絡初期電流値
Ｉip 電極プラス極性用短絡初期電流値
Ｉｋ 短絡解除電流値
Ｉkn 電極マイナス極性用短絡解除電流値
Ｉkp 電極プラス極性用短絡解除電流値
ＩＮＴ 高周波トランス
ＩＮＶ インバータ回路
ＩＲ 短絡電流設定回路
Ｉｒ 短絡電流設定信号
Ｎｄ 電極マイナス極性スイッチング素子駆動信号
ＮＴＲ 電極マイナス極性スイッチング素子
Ｐｄ 電極プラス極性スイッチング素子駆動信号
ＰＮＲ 電極マイナス極性用短絡電流波形パラメータ設定回路
Ｐnr 電極マイナス極性用短絡電流波形パラメータ設定信号
ＰＰＲ 電極プラス極性用短絡電流波形パラメータ設定回路
Ｐpr 電極プラス極性用短絡電流波形パラメータ設定信号
Ｐｒ パラメータ設定信号
ＰＴＲ 電極プラス極性スイッチング素子
ＳＡ 極性切換信号生成回路
Ｓａ 極性切換信号
ＳＢ 極性切換開始信号生成回路
Ｓｂ 極性切換開始信号
ＳＤ 短絡判別回路
Ｓｄ 短絡判別信号
ＳＰ パラメータ切換信号生成回路
Ｓｐ パラメータ切換信号
Ｓti 短絡初期期間終了信号
ＳＷ 外部特性切換回路
ＳＷＰ パラメータ切換回路
Ｔａ アーク期間
Ｔｅｎ 電極マイナス極性期間
Ｔep 電極プラス極性期間
Ｔｉ 短絡初期期間
Ｔin 電極マイナス極性用短絡初期期間
Ｔip 電極プラス極性用短絡初期期間
Ｔｋ 短絡解除期間
Ｔkn 電極マイナス極性用短絡解除期間
Ｔkp 電極プラス極性用短絡解除期間
Ｔｓ 短絡期間
ｖ 溶接電圧
ＶＤ 電圧検出回路
Ｖｄ 電圧検出信号
ＶＲ 電圧設定回路
Ｖｒ 電圧設定信号
ＷＬ リアクトル
1 Welding wire
2 Base material
3 arc
4 Welding torch
5 Feeding roll AC AC commercial power supply Cu Ascending characteristic Cun Electrode minus polarity ascending characteristic Cup Electrode plus polarity ascending characteristic D2a to D2d Secondary side diode Dv Drive circuit Ea Error amplification signal EI Current error amplification circuit Ei Current error amplification signal EN Electrode negative polarity EP Electrode positive polarity EV Voltage error amplification circuit Ev Voltage error amplification signal i Welding current ID Current detection circuit Id Current detection signal Ii Short circuit initial current Iin Short circuit initial current value for electrode negative polarity Iip Short circuit initial current value for electrode positive polarity Ik Short-circuit release current value Ikn Short-circuit release current value for electrode negative polarity Ikp Short-circuit release current value for electrode positive polarity INT High-frequency transformer INV Inverter circuit IR Short-circuit current setting circuit Ir Short-circuit current setting signal Nd Electrode negative-polarity switching element drive signal NTR Electrode negative Polarity switching element d Electrode positive polarity switching element drive signal PNR Electrode negative polarity short circuit current waveform parameter setting circuit Pnr Electrode negative polarity short circuit current waveform parameter setting signal PPR Electrode positive polarity short circuit current waveform parameter setting circuit Ppr Electrode positive polarity short circuit current waveform parameter Setting signal Pr Parameter setting signal PTR Electrode plus polarity switching element SA Polarity switching signal generation circuit Sa Polarity switching signal SB Polarity switching start signal generation circuit Sb Polarity switching start signal SD Short circuit determination circuit Sd Short circuit determination signal SP Parameter switching signal generation circuit Sp Parameters Switching signal Sti Short circuit initial period end signal SW External characteristic switching circuit SWP Parameter switching circuit Ta Arc period Ten Electrode negative polarity period Tep Electrode positive polarity period Ti Short circuit initial period Tin Electrode negative polarity first short circuit Period Tip Electrode positive polarity short circuit initial period Tk Short circuit release period Tkn Electrode negative polarity short circuit release period Tkp Electrode positive polarity short circuit release period Ts Short circuit period v Welding voltage VD Voltage detection circuit Vd Voltage detection signal VR Voltage setting circuit Vr Voltage setting Signal WL reactor
Claims (5)
溶接電源の出力極性を電極プラス極性と電極マイナス極性とに前記短絡期間中の所定極性切換タイミングで交互に切り換え、前記短絡電流波形パラメータを前記電極プラス極性期間と電極マイナス極性期間とで異なる値に設定して溶接を行う交流消耗電極短絡アーク溶接方法において、
前記短絡電流波形パラメータは、出力極性が短絡期間中に切り換わりこの短絡が解除されてアークが発生した後に各出力極性に対応した値に切り換わる、ことを特徴とする交流消耗電極短絡アーク溶接方法。 It is suitable for short-circuit arc welding that feeds a welding wire and repeats a short-circuit period in which a short-circuit current is applied according to a predetermined short-circuit current waveform parameter and an arc period in which an arc current is applied according to a predetermined constant voltage characteristic. And
The output polarity of the welding power source is alternately switched between an electrode positive polarity and an electrode negative polarity at a predetermined polarity switching timing during the short circuit period, and the short circuit current waveform parameter is set to a different value between the electrode positive polarity period and the electrode negative polarity period. In the AC consumable electrode short-circuit arc welding method of setting and welding,
The alternating current consumable electrode short circuit arc welding method, wherein the short circuit current waveform parameter is switched to a value corresponding to each output polarity after the output polarity is switched during the short circuit period and the short circuit is released and an arc is generated. .
前記短絡電流波形パラメータとして、前記上昇特性、前記短絡解除期間又は前記短絡解除電流値の少なくとも１つ以上を設定する、ことを特徴とする請求項１記載の交流消耗電極短絡アーク溶接方法。 When a short-circuit occurs, the short-circuit current is decreased to a predetermined short-circuit initial current value during a predetermined initial short-circuit period, and then increased according to a predetermined rising characteristic. When the period elapses, the short-circuit is released by rapidly increasing to a predetermined short-circuit release current value of a large current value,
2. The AC consumable electrode short-circuit arc welding method according to claim 1, wherein at least one of the increase characteristic, the short-circuit release period, or the short-circuit release current value is set as the short-circuit current waveform parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007244603A JP4950819B2 (en) | 2007-09-21 | 2007-09-21 | AC consumable electrode short-circuit arc welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007244603A JP4950819B2 (en) | 2007-09-21 | 2007-09-21 | AC consumable electrode short-circuit arc welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2009072814A true JP2009072814A (en) | 2009-04-09 |
| JP4950819B2 JP4950819B2 (en) | 2012-06-13 |
Family
ID=40608338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007244603A Active JP4950819B2 (en) | 2007-09-21 | 2007-09-21 | AC consumable electrode short-circuit arc welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4950819B2 (en) |
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012029226A1 (en) * | 2010-09-01 | 2012-03-08 | パナソニック株式会社 | Alternating current tig welding method |
| WO2014073184A1 (en) * | 2012-11-07 | 2014-05-15 | パナソニック株式会社 | Arc welder and method for controlling arc welding |
| WO2014158531A1 (en) * | 2013-03-14 | 2014-10-02 | Illinois Tool Works Inc. | Electrode negative pulse welding system and method |
| US9950383B2 (en) | 2013-02-05 | 2018-04-24 | Illinois Tool Works Inc. | Welding wire preheating system and method |
| US10040143B2 (en) | 2012-12-12 | 2018-08-07 | Illinois Tool Works Inc. | Dabbing pulsed welding system and method |
| US10189106B2 (en) | 2014-12-11 | 2019-01-29 | Illinois Tool Works Inc. | Reduced energy welding system and method |
| US10610946B2 (en) | 2015-12-07 | 2020-04-07 | Illinois Tool Works, Inc. | Systems and methods for automated root pass welding |
| US10675699B2 (en) | 2015-12-10 | 2020-06-09 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US10766092B2 (en) | 2017-04-18 | 2020-09-08 | Illinois Tool Works Inc. | Systems, methods, and apparatus to provide preheat voltage feedback loss protection |
| US10828728B2 (en) | 2013-09-26 | 2020-11-10 | Illinois Tool Works Inc. | Hotwire deposition material processing system and method |
| US10870164B2 (en) | 2017-05-16 | 2020-12-22 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US10906114B2 (en) | 2012-12-21 | 2021-02-02 | Illinois Tool Works Inc. | System for arc welding with enhanced metal deposition |
| US10919100B2 (en) * | 2016-03-29 | 2021-02-16 | Panasonic Intellectual Property Management Co., Ltd. | Arc welding control method |
| US10926349B2 (en) | 2017-06-09 | 2021-02-23 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US11014185B2 (en) | 2018-09-27 | 2021-05-25 | Illinois Tool Works Inc. | Systems, methods, and apparatus for control of wire preheating in welding-type systems |
| US11020813B2 (en) | 2017-09-13 | 2021-06-01 | Illinois Tool Works Inc. | Systems, methods, and apparatus to reduce cast in a welding wire |
| US11045891B2 (en) | 2013-06-13 | 2021-06-29 | Illinois Tool Works Inc. | Systems and methods for anomalous cathode event control |
| US11154946B2 (en) | 2014-06-30 | 2021-10-26 | Illinois Tool Works Inc. | Systems and methods for the control of welding parameters |
| US11198189B2 (en) | 2014-09-17 | 2021-12-14 | Illinois Tool Works Inc. | Electrode negative pulse welding system and method |
| US11247290B2 (en) | 2017-06-09 | 2022-02-15 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US11285559B2 (en) | 2015-11-30 | 2022-03-29 | Illinois Tool Works Inc. | Welding system and method for shielded welding wires |
| US11370050B2 (en) | 2015-03-31 | 2022-06-28 | Illinois Tool Works Inc. | Controlled short circuit welding system and method |
| US11478870B2 (en) | 2014-11-26 | 2022-10-25 | Illinois Tool Works Inc. | Dabbing pulsed welding system and method |
| US11524354B2 (en) | 2017-06-09 | 2022-12-13 | Illinois Tool Works Inc. | Systems, methods, and apparatus to control weld current in a preheating system |
| US11590597B2 (en) | 2017-06-09 | 2023-02-28 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US11590598B2 (en) | 2017-06-09 | 2023-02-28 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US11654503B2 (en) | 2018-08-31 | 2023-05-23 | Illinois Tool Works Inc. | Submerged arc welding systems and submerged arc welding torches to resistively preheat electrode wire |
| US11772182B2 (en) | 2019-12-20 | 2023-10-03 | Illinois Tool Works Inc. | Systems and methods for gas control during welding wire pretreatments |
| US11897062B2 (en) | 2018-12-19 | 2024-02-13 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5838664A (en) * | 1981-08-31 | 1983-03-07 | Mitsubishi Electric Corp | Consumable electrode type arc welding machine |
| JP2006142317A (en) * | 2004-11-17 | 2006-06-08 | Daihen Corp | Polarity switching short circuiting arc welding method |
| WO2006089322A1 (en) * | 2005-02-25 | 2006-08-31 | Fronius International Gmbh | Method for controlling and/or regulating a welding device, and welding device |
-
2007
- 2007-09-21 JP JP2007244603A patent/JP4950819B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5838664A (en) * | 1981-08-31 | 1983-03-07 | Mitsubishi Electric Corp | Consumable electrode type arc welding machine |
| JP2006142317A (en) * | 2004-11-17 | 2006-06-08 | Daihen Corp | Polarity switching short circuiting arc welding method |
| WO2006089322A1 (en) * | 2005-02-25 | 2006-08-31 | Fronius International Gmbh | Method for controlling and/or regulating a welding device, and welding device |
Cited By (41)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012029226A1 (en) * | 2010-09-01 | 2012-03-08 | パナソニック株式会社 | Alternating current tig welding method |
| JP5429362B2 (en) * | 2010-09-01 | 2014-02-26 | パナソニック株式会社 | AC TIG welding method |
| CN104526130A (en) * | 2010-09-01 | 2015-04-22 | 松下电器产业株式会社 | Alternating current TIG welding method |
| CN104526130B (en) * | 2010-09-01 | 2016-09-28 | 松下知识产权经营株式会社 | AC-TIG WELDING welder |
| WO2014073184A1 (en) * | 2012-11-07 | 2014-05-15 | パナソニック株式会社 | Arc welder and method for controlling arc welding |
| US10625358B2 (en) | 2012-11-07 | 2020-04-21 | Panasonic Intellectual Property Management Co., Ltd. | Arc welder and method for controlling arc welding |
| US10040143B2 (en) | 2012-12-12 | 2018-08-07 | Illinois Tool Works Inc. | Dabbing pulsed welding system and method |
| US10906114B2 (en) | 2012-12-21 | 2021-02-02 | Illinois Tool Works Inc. | System for arc welding with enhanced metal deposition |
| US11878376B2 (en) | 2013-02-05 | 2024-01-23 | Illinois Tool Works Inc. | Welding wire preheating systems and methods |
| US11040410B2 (en) | 2013-02-05 | 2021-06-22 | Illinois Tool Works Inc. | Welding wire preheating systems and methods |
| US9950383B2 (en) | 2013-02-05 | 2018-04-24 | Illinois Tool Works Inc. | Welding wire preheating system and method |
| US10835983B2 (en) | 2013-03-14 | 2020-11-17 | Illinois Tool Works Inc. | Electrode negative pulse welding system and method |
| US10835984B2 (en) | 2013-03-14 | 2020-11-17 | Illinois Tool Works Inc. | Electrode negative pulse welding system and method |
| WO2014158531A1 (en) * | 2013-03-14 | 2014-10-02 | Illinois Tool Works Inc. | Electrode negative pulse welding system and method |
| US11045891B2 (en) | 2013-06-13 | 2021-06-29 | Illinois Tool Works Inc. | Systems and methods for anomalous cathode event control |
| US10828728B2 (en) | 2013-09-26 | 2020-11-10 | Illinois Tool Works Inc. | Hotwire deposition material processing system and method |
| US11154946B2 (en) | 2014-06-30 | 2021-10-26 | Illinois Tool Works Inc. | Systems and methods for the control of welding parameters |
| US11198189B2 (en) | 2014-09-17 | 2021-12-14 | Illinois Tool Works Inc. | Electrode negative pulse welding system and method |
| US11478870B2 (en) | 2014-11-26 | 2022-10-25 | Illinois Tool Works Inc. | Dabbing pulsed welding system and method |
| US11253940B2 (en) | 2014-12-11 | 2022-02-22 | Illinois Tool Works Inc. | Reduced energy welding system and method |
| US10189106B2 (en) | 2014-12-11 | 2019-01-29 | Illinois Tool Works Inc. | Reduced energy welding system and method |
| US11370050B2 (en) | 2015-03-31 | 2022-06-28 | Illinois Tool Works Inc. | Controlled short circuit welding system and method |
| US11285559B2 (en) | 2015-11-30 | 2022-03-29 | Illinois Tool Works Inc. | Welding system and method for shielded welding wires |
| US11766732B2 (en) | 2015-12-07 | 2023-09-26 | Illinois Tool Works Inc. | Systems and methods for automated root pass welding |
| US10610946B2 (en) | 2015-12-07 | 2020-04-07 | Illinois Tool Works, Inc. | Systems and methods for automated root pass welding |
| US10675699B2 (en) | 2015-12-10 | 2020-06-09 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US10919100B2 (en) * | 2016-03-29 | 2021-02-16 | Panasonic Intellectual Property Management Co., Ltd. | Arc welding control method |
| US10766092B2 (en) | 2017-04-18 | 2020-09-08 | Illinois Tool Works Inc. | Systems, methods, and apparatus to provide preheat voltage feedback loss protection |
| US11911859B2 (en) | 2017-04-18 | 2024-02-27 | Illinois Tool Works Inc. | Systems, methods, and apparatus to provide preheat voltage feedback loss protection |
| US11819959B2 (en) | 2017-05-16 | 2023-11-21 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US10870164B2 (en) | 2017-05-16 | 2020-12-22 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US11524354B2 (en) | 2017-06-09 | 2022-12-13 | Illinois Tool Works Inc. | Systems, methods, and apparatus to control weld current in a preheating system |
| US11590597B2 (en) | 2017-06-09 | 2023-02-28 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US11590598B2 (en) | 2017-06-09 | 2023-02-28 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US11247290B2 (en) | 2017-06-09 | 2022-02-15 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US10926349B2 (en) | 2017-06-09 | 2021-02-23 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US11020813B2 (en) | 2017-09-13 | 2021-06-01 | Illinois Tool Works Inc. | Systems, methods, and apparatus to reduce cast in a welding wire |
| US11654503B2 (en) | 2018-08-31 | 2023-05-23 | Illinois Tool Works Inc. | Submerged arc welding systems and submerged arc welding torches to resistively preheat electrode wire |
| US11014185B2 (en) | 2018-09-27 | 2021-05-25 | Illinois Tool Works Inc. | Systems, methods, and apparatus for control of wire preheating in welding-type systems |
| US11897062B2 (en) | 2018-12-19 | 2024-02-13 | Illinois Tool Works Inc. | Systems, methods, and apparatus to preheat welding wire |
| US11772182B2 (en) | 2019-12-20 | 2023-10-03 | Illinois Tool Works Inc. | Systems and methods for gas control during welding wire pretreatments |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4950819B2 (en) | 2012-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4950819B2 (en) | AC consumable electrode short-circuit arc welding method | |
| JP4916759B2 (en) | Polarity switching control method for consumable electrode AC pulse arc welding | |
| JP4652825B2 (en) | Arc start control method for AC arc welding | |
| JP2006142317A (en) | Polarity switching short circuiting arc welding method | |
| JP5090765B2 (en) | Feed control method for consumable electrode AC arc welding | |
| JP6524412B2 (en) | Arc welding control method | |
| JP5622230B2 (en) | AC pulse arc welding control method | |
| JP2014083571A (en) | Welding current control method during short-circuit period | |
| JP2010075983A (en) | Control method of ac pulse arc welding | |
| JP5090759B2 (en) | Output control method for consumable electrode AC arc welding power supply | |
| JP2013240811A (en) | Ac pulse arc welding control method | |
| JP5851798B2 (en) | Current control method for constriction detection in consumable electrode arc welding | |
| JP2016144826A (en) | Output control method for pulse arc welding | |
| JP4211724B2 (en) | Arc welding control method and arc welding apparatus | |
| JP2017189818A (en) | Arc start method | |
| JP5871360B2 (en) | Constriction detection control method for consumable electrode arc welding | |
| JP5349152B2 (en) | AC pulse arc welding control method | |
| JP4850638B2 (en) | Polarity switching short-circuit arc welding method | |
| JP2021079427A (en) | Arc-welding control method | |
| JP4643236B2 (en) | Polarity switching short-circuit arc welding method | |
| JP7429598B2 (en) | arc welding power supply | |
| WO2021140970A1 (en) | Arc welding control method and arc welding device | |
| JP6746452B2 (en) | AC arc welding control method | |
| JP4576904B2 (en) | Arc welding equipment | |
| JP2022185997A (en) | Pulse arc welding power source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20100830 |
|
| TRDD | Decision of grant or rejection written | ||
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20120216 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20120306 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20120309 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150316 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 4950819 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |