JP2012086275A - Output control method of power source in consumable electrode arc welding - Google Patents

Output control method of power source in consumable electrode arc welding Download PDF

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JP2012086275A
JP2012086275A JP2012024795A JP2012024795A JP2012086275A JP 2012086275 A JP2012086275 A JP 2012086275A JP 2012024795 A JP2012024795 A JP 2012024795A JP 2012024795 A JP2012024795 A JP 2012024795A JP 2012086275 A JP2012086275 A JP 2012086275A
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welding
power source
consumable electrode
speed
electrode arc
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Yuji Ueda
裕司 上田
Toshiro Uesono
敏郎 上園
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Daihen Corp
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PROBLEM TO BE SOLVED: To improve stability of a welding state in consumable electrode arc welding, when slow-speed welding for a thick plate is performed with a large-sized molten pool immediately below the arc, and when high-speed welding for a thin sheet is performed with a small-sized molten pool immediately below the arc.SOLUTION: This is an output control method of a power source in the consumable electrode arc welding, a method in which inclination Kr of the external properties of the welding power source is controlled in accordance with welding conditions and in which, as the characteristic, the welding conditions are wire deposition quantity Fr per unit welding length. By varying the inclination Kr of the external properties in accordance with the wire deposition quantity Fr per unit welding length, stable welding state can be obtained in the low-speed welding for a thick plate as well as high-speed welding for a thin sheet.

Description

本発明は、溶接条件に応じて溶接電源の外部特性の傾きを適正値に制御するための消耗電極アーク溶接電源の出力制御方法に関するものである。   The present invention relates to an output control method for a consumable electrode arc welding power source for controlling an inclination of an external characteristic of a welding power source to an appropriate value according to welding conditions.

図６は、消耗電極アーク溶接電源の外部特性を示す図である。同図の横軸は溶接電源の出力電流Ｉｗを示し、縦軸は出力端子電圧である溶接電圧Ｖｗを示す。外部特性Ｌ１、Ｌ２は、出力電流Ｉｗと溶接電圧Ｖｗとの関係を表すものであり、一般的に右下がりの略直線となる。したがって、外部特性は下式で表すことができる。
Ｖｗ＝Ｋｒ×（Ｉｗ−Ｉｒ）＋Ｖｒ …（１）式
但し、Ｋｒ［V/A］は傾き設定値、Ｉｒ［Ａ］は出力電流基準値、Ｖｒ［Ｖ］は溶接電圧基準値である。これらの値を設定することによって外部特性を設定する。 FIG. 6 is a diagram showing external characteristics of the consumable electrode arc welding power source. In the figure, the horizontal axis indicates the output current Iw of the welding power source, and the vertical axis indicates the welding voltage Vw that is the output terminal voltage. The external characteristics L1 and L2 represent the relationship between the output current Iw and the welding voltage Vw, and are generally a straight line with a downward slope to the right. Therefore, the external characteristic can be expressed by the following formula.
Vw = Kr × (Iw−Ir) + Vr (1) where Kr [V / A] is the slope setting value, Ir [A] is the output current reference value, and Vr [V] is the welding voltage reference value. External characteristics are set by setting these values.

例えば、外部特性Ｌ１は傾き設定値Ｋｒ＝−０．０３Ｖ／Ａの略定電圧特性の場合であり、外部特性Ｌ２は傾き設定値Ｋｒ＝−０．１Ｖ／Ａの垂下特性の場合である。消耗電極アーク溶接においては、種々の外乱が発生してもアーク長を適正値に維持することが良好な溶接品質を得るために重要である。この外乱に対してアーク長を適正値に維持する制御をアーク長制御と呼ぶ。外部特性の傾きはアーク長制御系のゲイン（利得）を決めるので、アーク長制御系の安定性と密接な関係にある。   For example, the external characteristic L1 is a case of a substantially constant voltage characteristic with a slope setting value Kr = −0.03 V / A, and the external characteristic L2 is a case of a drooping characteristic with a slope setting value Kr = −0.1 V / A. In consumable electrode arc welding, it is important to maintain the arc length at an appropriate value even when various disturbances occur in order to obtain good welding quality. Control for maintaining the arc length at an appropriate value against this disturbance is called arc length control. The slope of the external characteristic determines the gain of the arc length control system, and is closely related to the stability of the arc length control system.

したがって、外部特性の傾きは、溶接条件に応じてアーク長制御系が安定になるように設定される。従来から、溶接法、溶接ワイヤの直径、材質及び出力電流（ワイヤ送給速度）に応じて、外部特性の傾きを変化させることによって、アーク長制御系のゲインを調整して安定化を図ってきた。例えば、ＣＯ2／ＭＡＧ溶接の場合にが、同図に示す外部特性Ｌ１のように、傾き設定値Ｋｒ＝−０．０３に設定する。他方、パルスアーク溶接の場合には、同図に示す外部特性Ｌ２のように、傾き設定値Ｋｒ＝−０．１に設定する。こうすることによって、アーク長制御系が安定化し、アーク状態が良好になる（例えば、特許文献１参照）。   Therefore, the inclination of the external characteristic is set so that the arc length control system becomes stable according to the welding conditions. Conventionally, the gain of the arc length control system has been adjusted and stabilized by changing the slope of the external characteristics in accordance with the welding method, welding wire diameter, material and output current (wire feed speed). It was. For example, in the case of CO2 / MAG welding, the inclination set value Kr = −0.03 is set as in the external characteristic L1 shown in FIG. On the other hand, in the case of pulse arc welding, the inclination set value Kr = −0.1 is set as in the external characteristic L2 shown in FIG. By doing so, the arc length control system is stabilized and the arc state is improved (see, for example, Patent Document 1).

特開２００２−２５４１７２号公報JP 2002-254172 A

溶接法をＣＯ2溶接、溶接ワイヤの直径を１．２mm、材質を軟鋼、出力電流を３００Ａに設定したときの外部特性の傾きをＫｒ＝−０．０３Ｖ／Ａに設定した場合を例として考える。この条件で薄板高速溶接を行うと、良好な溶接品質を得ることができる。しかし、この条件で厚板低速溶接を行うと、スパッタの多い不安定な溶接状態になる。図７は、そのときの溶接電圧Ｖｗ及び出力電流Ｉｗの波形図である。同図（Ａ）に示すように、溶接電圧Ｖｗは略一定値に制御されている。他方、同図（Ｂ）に示すように、出力電流Ｉｗは周期的に大きく変動している。これは、外部特性の傾きＫｒが−０．０３と定電圧特性でありアーク長制御系のゲインが大きいので、溶接電圧Ｖｗが一定値に強く制御されるために、出力電流Ｉｗはそれを補償するために変動する。図８は、そのときのアーク発生部を示す図である。同図（Ａ）に示すように、溶接ワイヤ１と溶融池２ａとの間にアーク３が発生している。同図（Ａ）から同図（Ｃ）へと時間が経過するのに伴って溶接状態が変化していく。同図に示すように、溶融池２ａが大きく揺動している。このために、スパッタが多く発生し溶接状態も不安定になる。この原因は、出力電流Ｉｗが周期的に大きく変動するために、それに伴ってアーク力が変化し溶融池２ａが揺動されるためである。   Consider the case where the welding method is CO2 welding, the diameter of the welding wire is 1.2 mm, the material is mild steel, and the slope of the external characteristic is set to Kr = −0.03 V / A when the output current is set to 300 A. When thin plate high-speed welding is performed under these conditions, good welding quality can be obtained. However, if thick plate low-speed welding is performed under these conditions, an unstable welding state with many spatters is obtained. FIG. 7 is a waveform diagram of the welding voltage Vw and the output current Iw at that time. As shown in FIG. 3A, the welding voltage Vw is controlled to a substantially constant value. On the other hand, the output current Iw fluctuates greatly periodically as shown in FIG. This is a constant voltage characteristic with a slope Kr of the external characteristic of −0.03, and the arc length control system has a large gain. Therefore, the welding voltage Vw is strongly controlled to a constant value, so the output current Iw compensates for it. To fluctuate. FIG. 8 is a diagram showing an arc generation unit at that time. As shown in FIG. 2A, an arc 3 is generated between the welding wire 1 and the molten pool 2a. As time elapses from FIG. 3A to FIG. 1C, the welding state changes. As shown in the figure, the molten pool 2a is largely swung. For this reason, many spatters are generated and the welding state becomes unstable. This is because the output current Iw fluctuates greatly periodically, the arc force changes accordingly, and the molten pool 2a is swung.

上述したように、溶接法、溶接ワイヤの直径、材質及び出力電流（ワイヤ送給速度）が同じ条件であっても、アーク３によって溶融池２ａが揺動されるか否かによって溶接状態は大きく影響される。したがって、溶融池２ａのサイズが大きく、アーク３によって揺動されるときは外部特性の傾きを変化させる必要がある。   As described above, even if the welding method, the diameter of the welding wire, the material, and the output current (wire feeding speed) are the same, the welding state is largely dependent on whether or not the molten pool 2a is swung by the arc 3. Affected. Therefore, when the size of the molten pool 2a is large and is swung by the arc 3, it is necessary to change the inclination of the external characteristics.

そこで、本発明は、溶融池のサイズが大きいときに、アーク力の変動による溶融池の揺動を抑制して安定した溶接状態を得ることができる消耗電極アーク溶接電源の出力制御方法を提供する。   Therefore, the present invention provides an output control method of a consumable electrode arc welding power source that can obtain a stable welding state by suppressing fluctuation of the molten pool due to fluctuations in arc force when the size of the molten pool is large. .

上述した課題を解決するために、請求項１の発明は、消耗電極アーク溶接に用いる溶接電源の外部特性の傾きを溶接条件に応じて制御する消耗電極アーク溶接電源の出力制御方法において、
前記溶接条件が単位溶接長さ当たりのワイヤ溶着量である、
ことを特徴とする消耗電極アーク溶接電源の出力制御方法である。 In order to solve the above-described problem, the invention of claim 1 is directed to an output control method for a consumable electrode arc welding power source that controls the inclination of the external characteristics of the welding power source used for consumable electrode arc welding according to welding conditions.
The welding condition is the amount of wire deposited per unit weld length,
An output control method for a consumable electrode arc welding power source.

請求項２の発明は、溶接ワイヤの半径及びワイヤ送給速度が一定であるときは、前記溶接条件が溶接速度である、
ことを特徴とする請求項１記載の消耗電極アーク溶接電源の出力制御方法である。 In the invention of claim 2, when the radius of the welding wire and the wire feeding speed are constant, the welding condition is the welding speed.
The consumable electrode arc welding power source output control method according to claim 1.

請求項３の発明は、継手形状が同一であるときは、前記溶接条件が溶接速度である、
ことを特徴とする請求項１記載の消耗電極アーク溶接電源の出力制御方法である。 In the invention of claim 3, when the joint shape is the same, the welding condition is a welding speed.
The consumable electrode arc welding power source output control method according to claim 1.

本発明によれば、単位溶接長さ当たりのワイヤ溶着量に応じて外部特性の傾きを変化させることによって、溶接状態を安定化することができる。   According to the present invention, the welding state can be stabilized by changing the inclination of the external characteristic in accordance with the amount of wire welding per unit weld length.

本発明の実施の形態１に係る出力制御方法を実施するための消耗電極アーク溶接電源のブロック図である。It is a block diagram of the consumable electrode arc welding power supply for implementing the output control method which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る溶融池幅設定値Ｐｒと傾き設定値Ｋｒとの関係図である。FIG. 5 is a relationship diagram between a weld pool width set value Pr and a tilt set value Kr according to Embodiment 1 of the present invention. 本発明の実施の形態１によって厚板低速溶接を行ったときの溶接電圧Ｖｗ及び出力電流Ｉｗの波形図である。It is a wave form diagram of welding voltage Vw and output current Iw when thick plate low-speed welding is performed by Embodiment 1 of the present invention. 本発明の実施の形態２に係る単位溶接長さ当たりのワイヤ溶着量設定値Ｆｒと傾き設定値Ｋｒとの関係図である。FIG. 10 is a relationship diagram between a wire welding amount setting value Fr per unit welding length and an inclination setting value Kr according to Embodiment 2 of the present invention. 本発明の実施の形態３に係る溶接速度設定値Ｗｒと傾き設定値Ｋｒとの関係図である。It is a related figure of welding speed set value Wr and inclination set value Kr concerning Embodiment 3 of the present invention. 従来技術における溶接電源の外部特性を示す図である。It is a figure which shows the external characteristic of the welding power supply in a prior art. 従来技術によって厚板低速溶接を行ったときの溶接電圧Ｖｗ及び出力電流Ｉｗの波形図である。It is a wave form diagram of welding voltage Vw and output current Iw when thick plate low-speed welding is performed by conventional technology. 図７の溶接時の溶融池の状態を示す図である。It is a figure which shows the state of the molten pool at the time of welding of FIG.

実施の形態１は、本発明の参考となる実施の形態である。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。   The first embodiment is a reference embodiment of the present invention. Embodiments of the present invention will be described below with reference to the drawings.

［実施の形態１］
図１は、本発明の実施の形態１に係る出力制御方法を実施するための消耗電極アーク溶接電源のブロック図である。以下、同図を参照して説明する。 [Embodiment 1]
FIG. 1 is a block diagram of a consumable electrode arc welding power source for carrying out an output control method according to Embodiment 1 of the present invention. Hereinafter, a description will be given with reference to FIG.

電源主回路ＰＭは、３相２００Ｖ等の商用電源を入力として、後述する電圧誤差増幅信号Ｅｖに従ってインバータ制御、サイリスタ位相制御等の出力制御を行い、出力電圧Ｅを出力する。リアクトルＷＬは、出力電圧Ｅを平滑する。溶接ワイヤ１は溶接トーチ４内を送給されて、母材２との間にアーク３が発生する。溶接トーチ４の給電チップ（図示せず）と母材２との間には溶接電圧Ｖｗが印可し、出力電流Ｉｗが通電する。   The power supply main circuit PM receives a commercial power supply such as a three-phase 200 V input, performs output control such as inverter control and thyristor phase control according to a voltage error amplification signal Ev described later, and outputs an output voltage E. Reactor WL smoothes output voltage E. The welding wire 1 is fed through the welding torch 4 and an arc 3 is generated between the welding wire 1 and the base material 2. A welding voltage Vw is applied between a power feed tip (not shown) of the welding torch 4 and the base material 2, and an output current Iw is conducted.

電流検出回路ＩＤは、上記の出力電流Ｉｗを検出して、電流検出信号Ｉｄを出力する。溶接電圧基準値設定回路ＶＲは、予め定めた溶接電圧基準値信号Ｖｒを出力する。出力電流基準値設定回路ＩＲは、予め定めた出力電流基準値信号Ｉｒを出力する。溶融池幅設定回路ＰＲは、溶融池幅を設定するための溶融池幅設定信号Ｐｒを出力する。溶融池幅は、目視又はセンサによって計測して設定する。また、溶接ビードの幅を代わりに使用しても良い。傾き設定回路ＫＲは、上記の溶融池幅設定信号Ｐｒを入力として、図２で後述するように、外部特性の傾き設定信号Ｋｒを出力する。   The current detection circuit ID detects the output current Iw and outputs a current detection signal Id. The welding voltage reference value setting circuit VR outputs a predetermined welding voltage reference value signal Vr. The output current reference value setting circuit IR outputs a predetermined output current reference value signal Ir. The molten pool width setting circuit PR outputs a molten pool width setting signal Pr for setting the molten pool width. The weld pool width is set by visual observation or measurement with a sensor. Alternatively, the width of the weld bead may be used instead. The inclination setting circuit KR receives the above molten pool width setting signal Pr and outputs an inclination setting signal Kr having an external characteristic as will be described later with reference to FIG.

外部特性形成回路ＥＣＲは、上記の溶接電圧基準値信号Ｖｒ、出力電流基準値信号Ｉｒ、傾き設定信号Ｋｒ及び電流検出信号Ｉｄを入力として、（１）式に従って、Ｅcr＝Ｋｒ×（Ｉｄ−Ｉｒ）＋Ｖｒを演算して、出力電圧設定信号Ｅcrを出力する。このように、図６で上述したように、所望の外部特性を形成するために電流検出信号Ｉｄ（出力電流Ｉｗ）に対応した出力電圧設定信号Ｅcrを算出する。   The external characteristic forming circuit ECR receives the welding voltage reference value signal Vr, the output current reference value signal Ir, the inclination setting signal Kr, and the current detection signal Id, and inputs Ecr = Kr × (Id−Ir) according to the equation (1). ) Calculate + Vr and output the output voltage setting signal Ecr. As described above with reference to FIG. 6, the output voltage setting signal Ecr corresponding to the current detection signal Id (output current Iw) is calculated in order to form a desired external characteristic.

出力電圧検出回路ＥＤは、上記の出力電圧Ｅを検出して、出力電圧検出信号Ｅｄを出力する。電圧誤差増幅回路ＥＶは、上記の出力電圧設定信号Ｅcrと出力電圧検出信号Ｅｄとの誤差を増幅して、電圧誤差増幅信号Ｅｖを出力する。上記のようなブロック構成によって、溶融池幅又はビード幅に応じた所望の傾きを有する外部特性を形成することができる。   The output voltage detection circuit ED detects the output voltage E and outputs an output voltage detection signal Ed. The voltage error amplification circuit EV amplifies an error between the output voltage setting signal Ecr and the output voltage detection signal Ed and outputs a voltage error amplification signal Ev. With the block configuration as described above, it is possible to form external characteristics having a desired inclination according to the molten pool width or bead width.

図２は、上記の傾き設定回路ＫＲにおける溶融池幅設定値Ｐｒと傾き設定値Ｋｒとの関係を示す図である。同図に示すように、溶融池幅設定値Ｐｒが広く（大きく）なると、傾き設定値Ｋｒは傾きが急な垂下特性になる。逆に、溶融池幅設定値Ｐｒが狭く（小さく）なると、傾き設定値Ｋｒは平坦な定電圧特性に近づく。溶融池幅設定値Ｐｒ＝Ｐr1のときの傾き設定値Ｋｒ＝Ｋr1となる。   FIG. 2 is a diagram showing the relationship between the molten pool width setting value Pr and the inclination setting value Kr in the inclination setting circuit KR. As shown in the figure, when the weld pool width set value Pr becomes wider (larger), the slope set value Kr has a drooping characteristic with a steep slope. Conversely, when the weld pool width set value Pr becomes narrow (small), the slope set value Kr approaches a flat constant voltage characteristic. The slope set value Kr = Kr1 when the weld pool width set value Pr = Pr1.

図３は、上述した実施の形態１によって厚板低速溶接を行ったときの溶接電圧Ｖｗ及び出力電流Ｉｗの波形図である。同図は、上述した図７と対応しており、直径１．２mmの軟鋼ワイヤを使用して出力電流３００ＡでＣＯ2溶接によって厚板低速溶接を行った場合である。この場合、溶融池幅が広くなるために、外部特性の傾きは急になり垂下特性になる。この結果、同図（Ａ）に示すように、溶接電圧Ｖｗは少し変動するが、同図（Ｂ）に示すように、出力電流Ｉｗは図７に比べて急激な変動はほとんどない。このために、出力電流Ｉｗの返送に伴うアーク力の変動が小さくなるので、溶融池が大きく揺動されて溶接状態が不安定になることはない。   FIG. 3 is a waveform diagram of the welding voltage Vw and the output current Iw when thick plate low-speed welding is performed according to the first embodiment described above. This figure corresponds to FIG. 7 described above, and shows a case where thick plate low-speed welding is performed by CO2 welding at an output current of 300 A using a mild steel wire having a diameter of 1.2 mm. In this case, since the molten pool width becomes wide, the slope of the external characteristic becomes steep and becomes a drooping characteristic. As a result, the welding voltage Vw slightly fluctuates as shown in FIG. 7A, but the output current Iw hardly changes as compared with FIG. 7 as shown in FIG. For this reason, since the fluctuation | variation of the arc force accompanying the return of the output current Iw becomes small, a weld pool does not rock | fluctuate greatly and a welding state does not become unstable.

同条件で薄板高速溶接を行った場合は、溶融池幅が狭くなるために、外部特性の傾きは平坦に近づき定電圧特性に変化する。高速溶接時はアーク長制御系のゲインを大きくしないと溶接が安定しないので、定電圧特性にすることによってこれを実現している。   When thin plate high-speed welding is performed under the same conditions, the molten pool width becomes narrow, so the slope of the external characteristics approaches flat and changes to constant voltage characteristics. During high-speed welding, welding is not stable unless the gain of the arc length control system is increased. This is achieved by using constant voltage characteristics.

上述した実施の形態１によれば、溶融池幅に応じて外部特性の傾きを変化させることによって、溶接状態を安定化することができる。   According to the first embodiment described above, the welding state can be stabilized by changing the slope of the external characteristics in accordance with the molten pool width.

［実施の形態２］
上述した実施の形態１では、図１に示すように、傾き設定回路ＫＲは、溶融池幅設定信号Ｐｒを入力として予め定めた関係に従って傾き設定信号Ｋｒを出力する。これに対して、実施の形態２では、溶融池幅の代わりに単位溶接長さ当たりのワイヤ溶着量設定値Ｆｒを使用する。これは、単位溶接長さ当たりのワイヤ溶着量設定値Ｆｒが大きいときは溶融池幅の広くなるからである。単位溶接長さ当たりのワイヤ溶着量設定値Ｆｒは下式で算出することができる。
Ｆｒ［mm３/mm］＝π・ｄ２・Ｗｆ［mm/min］／Ｗｒ［mm/min］
ここで、Ｗｆはワイヤ送給速度、ｄは溶接ワイヤの半径［mm］、Ｗｒは溶接速度である。 [Embodiment 2]
In the first embodiment described above, as shown in FIG. 1, the tilt setting circuit KR outputs the tilt setting signal Kr according to a predetermined relationship with the weld pool width setting signal Pr as an input. On the other hand, in Embodiment 2, the wire welding amount set value Fr per unit weld length is used instead of the weld pool width. This is because the weld pool width increases when the wire welding amount set value Fr per unit weld length is large. The wire welding amount set value Fr per unit weld length can be calculated by the following equation.
Fr [mm 3 / mm] = π · d 2 · Wf [mm / min] / Wr [mm / min]
Here, Wf is the wire feed speed, d is the radius [mm] of the welding wire, and Wr is the welding speed.

図４は、実施の形態２に係る傾き設定回路ＫＲにおける単位溶接長さ当たりのワイヤ溶着量設定値Ｆｒと傾き設定値Ｋｒとの関係を示す図である。同図に示すように、単位溶接長さ当たりのワイヤ溶着量設定値Ｆｒが大きくなると、傾き設定値Ｋｒは傾きが急な垂下特性になる。逆に、単位溶接長さ当たりのワイヤ溶着量設定値Ｆｒが小さくなると、傾き設定値Ｋｒは平坦な定電圧特性に近づく。単位溶接長さ当たりのワイヤ溶着量設定値Ｆｒ＝Ｆr1のときの傾き設定値Ｋｒ＝Ｋr1となる。   FIG. 4 is a diagram showing the relationship between the wire welding amount setting value Fr per unit welding length and the inclination setting value Kr in the inclination setting circuit KR according to the second embodiment. As shown in the figure, when the wire welding amount setting value Fr per unit welding length increases, the inclination setting value Kr has a drooping characteristic with a steep inclination. On the contrary, when the wire welding amount setting value Fr per unit welding length is small, the inclination setting value Kr approaches a flat constant voltage characteristic. The inclination setting value Kr = Kr1 when the wire welding amount setting value Fr = Fr1 per unit weld length is obtained.

上述した実施の形態２によれば、単位溶接長さ当たりのワイヤ溶着量に応じて外部特性の傾きを変化させることによって、溶接状態を安定化することができる。   According to the second embodiment described above, the welding state can be stabilized by changing the slope of the external characteristics in accordance with the amount of wire welding per unit weld length.

［実施の形態３］
上述した実施の形態１では、図１に示すように、傾き設定回路ＫＲは、溶融池幅設定信号Ｐｒを入力として予め定めた関係に従って傾き設定信号Ｋｒを出力する。これに対して、実施の形態３では、溶融池幅の代わりに溶接速度設定値Ｗｒを使用する。これは、溶接速度設定値Ｗｒが遅くなると溶融池幅も広くなるからである。 [Embodiment 3]
In the first embodiment described above, as shown in FIG. 1, the tilt setting circuit KR outputs the tilt setting signal Kr according to a predetermined relationship with the weld pool width setting signal Pr as an input. On the other hand, in the third embodiment, the welding speed set value Wr is used instead of the molten pool width. This is because the weld pool width increases as the welding speed set value Wr decreases.

図５は、実施の形態３に係る傾き設定回路ＫＲにおける溶接速度設定値Ｗｒと傾き設定値Ｋｒとの関係を示す図である。同図に示すように、溶接速度設定値Ｗｒが遅くなると、傾き設定値Ｋｒは傾きが急な垂下特性になる。逆に、溶接速度設定値Ｗｒが速くなると、傾き設定値Ｋｒは平坦な定電圧特性に近づく。溶接速度設定値Ｗｒ＝Ｗr1のときの傾き設定値Ｋｒ＝Ｋr1となる。   FIG. 5 is a diagram showing the relationship between the welding speed setting value Wr and the inclination setting value Kr in the inclination setting circuit KR according to the third embodiment. As shown in the figure, when the welding speed set value Wr becomes slow, the slope set value Kr has a drooping characteristic with a steep slope. Conversely, when the welding speed set value Wr is increased, the inclination set value Kr approaches a flat constant voltage characteristic. The inclination set value Kr = Kr1 when the welding speed set value Wr = Wr1 is obtained.

上述した実施の形態３によれば、溶接速度に応じて外部特性の傾きを変化させることによって、溶接状態を安定化することができる。   According to the third embodiment described above, the welding state can be stabilized by changing the inclination of the external characteristic in accordance with the welding speed.

ところで、上述した溶融池幅、ビード幅、単位溶接長さ当たりのワイヤ溶着量又は溶接速度の少なくとも１つ以上を組み合わせて外部特性の傾きを変化させても良い。   By the way, the slope of the external characteristics may be changed by combining at least one of the above-described weld pool width, bead width, wire welding amount per unit welding length, or welding speed.

１ 溶接ワイヤ
２ 母材
２ａ 溶融池
３ アーク
４ 溶接トーチ
ｄ 溶接ワイヤの半径
Ｅ 出力電圧
ＥＣＲ 外部特性形成回路
Ｅcr 出力電圧設定信号
ＥＤ 出力電圧検出回路
Ｅｄ 出力電圧検出信号
ＥＶ 電圧誤差増幅回路
Ｅｖ 電圧誤差増幅信号
Ｆｒ 単位溶接長さ当たりのワイヤ溶着量設定値
ＩＤ 電流検出回路
Ｉｄ 電流検出信号
ＩＲ 出力電流基準値設定回路
Ｉｒ 出力電流基準値（信号）
Ｉｗ 出力電流
ＫＲ 傾き設定回路
Ｋｒ 傾き設定（値／信号）
Ｌ１、Ｌ２ 外部特性
ＰＭ 電源主回路
ＰＲ 溶融池幅設定回路
Ｐｒ 溶融池幅設定（値／信号）
ＶＲ 溶接電圧基準値設定回路
Ｖｒ 溶接電圧基準値（信号）
Ｖｗ 溶接電圧
Ｗｆ ワイヤ送給速度
ＷＬ リアクトル
Ｗｒ 溶接速度設定値 DESCRIPTION OF SYMBOLS 1 Welding wire 2 Base material 2a Weld pool 3 Arc 4 Welding torch d Radius of welding wire E Output voltage ECR External characteristic formation circuit Ecr Output voltage setting signal ED Output voltage detection circuit Ed Output voltage detection signal EV Voltage error amplification circuit Ev Voltage error Amplification signal Fr Wire welding amount setting value ID per unit welding length Current detection circuit Id Current detection signal IR Output current reference value setting circuit Ir Output current reference value (signal)
Iw Output current KR Inclination setting circuit Kr Inclination setting (value / signal)
L1, L2 External characteristics PM Power supply main circuit PR Molten pool width setting circuit Pr Molten pool width setting (value / signal)
VR welding voltage reference value setting circuit Vr welding voltage reference value (signal)
Vw Welding voltage Wf Wire feed speed WL Reactor Wr Welding speed set value

Claims (3)

消耗電極アーク溶接に用いる溶接電源の外部特性の傾きを溶接条件に応じて制御する消耗電極アーク溶接電源の出力制御方法において、
前記溶接条件が単位溶接長さ当たりのワイヤ溶着量である、
ことを特徴とする消耗電極アーク溶接電源の出力制御方法。 In the output control method of the consumable electrode arc welding power source for controlling the inclination of the external characteristic of the welding power source used for consumable electrode arc welding according to the welding conditions,
The welding condition is the amount of wire deposited per unit weld length,
An output control method for a consumable electrode arc welding power source. 溶接ワイヤの半径及びワイヤ送給速度が一定であるときは、前記溶接条件が溶接速度である、
ことを特徴とする請求項１記載の消耗電極アーク溶接電源の出力制御方法。 When the radius of the welding wire and the wire feeding speed are constant, the welding condition is the welding speed.
The output control method for a consumable electrode arc welding power source according to claim 1. 継手形状が同一であるときは、前記溶接条件が溶接速度である、
ことを特徴とする請求項１記載の消耗電極アーク溶接電源の出力制御方法。 When the joint shape is the same, the welding condition is the welding speed,
The output control method for a consumable electrode arc welding power source according to claim 1.
JP2012024795A 2012-02-08 2012-02-08 Output control method of power source in consumable electrode arc welding Pending JP2012086275A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61269976A (en) * 1985-05-24 1986-11-29 Shipbuild Res Assoc Japan Automatic welding equipment
JPH09271945A (en) * 1996-04-09 1997-10-21 Daihen Corp Arc length reset control method and welding equipment in consumable electrode arc welding
JP2005066615A (en) * 2003-08-21 2005-03-17 Daihen Corp Arc-length control method at starting of gas-shielding arc welding with consumable electrode

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61269976A (en) * 1985-05-24 1986-11-29 Shipbuild Res Assoc Japan Automatic welding equipment
JPH09271945A (en) * 1996-04-09 1997-10-21 Daihen Corp Arc length reset control method and welding equipment in consumable electrode arc welding
JP2005066615A (en) * 2003-08-21 2005-03-17 Daihen Corp Arc-length control method at starting of gas-shielding arc welding with consumable electrode

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