Arc welding control method

A control method and arc welding technology, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as unstable welding state

Active Publication Date: 2017-02-22
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, it is necessary to change the voltage setting value to an appropriate value corresponding to the welding conditions.
However, in welding during the forward feed period and the reverse feed period in which the feed speed is switched alternately, if the voltage setting value is changed, the droplet transfer state will change, so there is a problem that the welding state becomes unstable.

Method used

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Effect test

Embodiment approach 1

[0029] The invention of Embodiment 1 changes the cycle of the feed speed by changing the cycle of the feed speed based on the voltage setting value, thereby changing the cycle of the feed speed.

[0030] figure 1 It is a block diagram of a welding power source for implementing the arc welding control method according to Embodiment 1 of the present invention. The following reference figure 1 to illustrate the blocks.

[0031] The power supply main circuit PM receives a commercial power supply (not shown) such as 3-phase 200V as input, performs output control by inverter control or the like in accordance with a drive signal Dv described later, and outputs an output voltage E. Although not shown in the figure, this power supply main circuit PM includes: a primary rectifier for rectifying commercial power; a smoothing capacitor for smoothing rectified direct current; and the aforementioned drive signal for converting smoothed direct current into high-frequency alternating curren...

Embodiment approach 2

[0054] The invention of Embodiment 2 detects the smooth value of the welding voltage, and performs feedback control on the cycle of the feed speed so that the smooth value of the welding voltage becomes equal to the voltage setting value.

[0055] image 3 It is a block diagram of a welding power source for implementing the arc welding control method according to Embodiment 2 of the present invention. image 3 with the above figure 1 Correspondingly, the same squares are marked with the same labels, and their descriptions are not repeated. image 3 The voltage detection circuit VD, the voltage smoothing circuit VAV and the feed error amplifier circuit EF are added, and the figure 1 The cycle setting circuit TFR of the previous cycle is replaced by a second cycle setting circuit TFR2. The following reference image 3 to illustrate these blocks.

[0056] The voltage detection circuit VD detects the welding voltage Vw and outputs a voltage detection signal Vd. The voltage s...

Embodiment approach 3

[0062] In the invention of Embodiment 3, when the waveform of the feed speed is a trapezoidal wave, the period is changed by changing the waveform parameter of the feed speed based on the voltage setting value.

[0063] Figure 4 It is a block diagram of a welding power source for implementing the arc welding control method according to Embodiment 3 of the present invention. Figure 4 with the above figure 1 Correspondingly, the same squares are marked with the same labels, and their descriptions are not repeated. Figure 4 deleted figure 1 The cycle setting circuit TFR, the amplitude setting circuit WFR and the positive feed side displacement setting circuit SFR. And the forward feed acceleration period setting circuit TSUR, the forward feed deceleration period setting circuit TSDR, the reverse feed acceleration period setting circuit TRUR, the reverse feed deceleration period setting circuit TRDR, the forward feed To the amplitude setting circuit WSR, the reverse feed am...

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Abstract

Provided is an arc welding control method that performs welding by alternately switching feed rate (Fw) for welding wire (1) between a forward feed period and a reverse feed period, controlling welding voltage (Vw) on the basis of a voltage setting value, and repeating a short period and an arc period, wherein a smoothed value for welding voltage (Vw) is detected and a cycle (Tf) of the feed rate (Fw) is feedback controlled such that this smoothed value for welding voltage and the voltage setting value are the same. Thereby, the cycle (Tf) of the feed rate (Fw) is made appropriate in correspondence with changes in the metal transfer mode accompanying changes in voltage setting value; therefore, it is possible to control occurrences of synchronization offsets in the cycle of forward feed and reverse feed for the feed rate (Fw) and the cycle of the short period and the arc period, and maintain stable welding conditions.

Description

technical field [0001] The present invention relates to an arc welding control method, which alternately switches the feeding speed of welding wire to a forward feeding period and a reverse feeding period, controls welding voltage based on a voltage setting value, and performs welding by repeating a short circuit period and an arc period. Background technique [0002] In general consumable-electrode arc welding, welding wire, which is a consumable electrode, is fed at a constant speed, and an arc is generated between the welding wire and the base material to perform welding. In consumable-electrode arc welding, the welding wire and the base metal are often in a welding state where short-circuit periods and arc periods are repeated alternately. [0003] In order to further improve the welding quality, a method of welding is proposed by alternately switching the forward feed and reverse feed of the welding wire. In the invention of Patent Document 1, the average value of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/12B23K9/073
CPCB23K9/12B23K9/125B23K9/073B23K9/0956B23K9/0953B23K9/124B23K9/1006
Inventor 井手章博
Owner DAIHEN CORP
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