Output control method of pulse arc welding

A technology of output control and pulsed arc, which is applied in the direction of arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of arc length control system stability and poor transition response, and achieve good transition response and droplet transition Good condition, good stability effect

Active Publication Date: 2009-11-25
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the welding current variation ΔI relative to the peak current Ip and the reference current Ib is set to an appropriate different value, the variation of the welding

Method used

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  • Output control method of pulse arc welding
  • Output control method of pulse arc welding
  • Output control method of pulse arc welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0109] figure 1 It is a block diagram of the welding power source for implementing the output control method of the pulse arc welding concerning Embodiment 1 of this invention. Hereinafter, each block diagram will be described with reference to this figure.

[0110] The power supply main circuit PM receives a commercial power supply (not shown) such as 3-phase 200V, performs output control by inverter control according to a drive signal Dv described later, and outputs welding current Iw and welding voltage Vw. This power supply main circuit PM is not shown, but includes a primary rectifier that rectifies commercial power, a capacitor that smoothes the rectified DC, and an inverter that converts the smoothed DC into high-frequency AC according to the above-mentioned drive signal Dv. It consists of a transformer circuit, a high-frequency transformer that steps down high-frequency AC to a voltage suitable for arc welding, a secondary rectifier that rectifies the stepped-down hi...

Embodiment approach 2

[0126] figure 2 It is a block diagram of the welding power source for implementing the output control method of the pulse arc welding concerning Embodiment 2 of this invention. In this figure, for the above figure 1 The same modules are assigned the same symbols, and their descriptions are omitted. Hereinafter, referring to the figure, for the figure 1 The second distribution ratio setting circuit HR2 shown by a different dotted line will be described.

[0127] The second distribution ratio setting circuit HR2 receives the wire feed speed setting signal Fr as an input, and outputs a distribution ratio signal α according to a predetermined function α=f(Fr). image 3 An example of this function is shown in . In this figure, the horizontal axis represents the wire feed speed setting signal Fr (m / min), and the vertical axis represents the distribution ratio signal α. As shown in the figure, the function f(Fr) becomes a straight line descending to the right with α=0.6 when ...

Embodiment approach 3

[0131] Figure 4 It is a current-voltage waveform diagram showing the output control method of the pulse arc welding according to Embodiment 3 of the present invention. This figure (A) shows the welding current Iw which energizes an arc, and this figure (B) shows the welding voltage Vw between a welding wire and a base metal. This figure shows the case of AC pulse arc welding in which part of the reference period is in the electrode negative polarity period. In this figure, the upper side of 0A and 0V is the electrode positive polarity EP, and the lower side is the electrode negative polarity EN. Hereinafter, description will be made with reference to this figure.

[0132] During the predetermined electrode negative polarity reference period Tn from time t1 to t2, as shown in (A) of the figure, an electrode negative polarity reference current In of a constant current value is energized in order not to form a droplet, as shown in (B) of the figure , apply the electrode negat...

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Abstract

The invention provides an output control method of pulse arc welding, wherein the droplet transfer state in low current area becomes good in the pulse arc welding of consumable electrode of arc long control by carrying out feedback control of peak current and reference current. The welding current variable quantity (delta I) is calculated according to the voltage error between the welding voltage set value (Vr) and the detected value (Vd) of welding voltage. Moreover, by using the preset peak period (Tp), reference period (Tb) and distribution ratio alpha (alpha is greater than or equal to 0 and less than or equal to 1) as inputs, the set signal of peak current is calculated in which Ipr = Ipr (n-1) + (delta I * (Tp+Tb) * alpha/Tp) so that the peak current is controlled. Simultaneously, the set signal of reference current is calculated in which Ibr = Ibr (n-1) + (delta I * (Tp+Tb) * (1-alpha)/Tp) so that the reference current is controlled. Therefore, the distribution of welding current variable quantity (delta I) for the reference current can become small relative to the distribution for the peak current, and the droplet transfer state in low current area can become good.

Description

technical field [0001] The present invention relates to an output control method for pulse arc welding for stabilizing the welding state by improving the output control method in melting electrode pulse arc welding. Background technique [0002] Figure 7 This is a general current and voltage waveform diagram for melting electrode pulse arc welding. This figure (A) shows the welding current Iw which energizes an arc, and this figure (B) shows the welding voltage Vw between a welding wire and a base metal. Hereinafter, description will be made with reference to this figure. [0003] During the peak period Tp from time t1 to t2, as shown in (A) of the figure, a peak current Ip equal to or higher than the critical current value is applied to make the transition from the welding wire to the droplet, as shown in (B) of the figure, between the wire and the droplet. A peak voltage Vp proportional to the arc length is applied between the base metals. [0004] During the reference...

Claims

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Application Information

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IPC IPC(8): B23K9/09B23K9/095B23K9/073
Inventor 伊佐太作上田裕司上园敏郎
Owner DAIHEN CORP
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