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Method for controlling arc length at beginning as consumable electrode gas shielded welding

A technology of molten electrode gas and control method, which is applied in the direction of welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as fluctuations and poor welding quality, and achieve the effects of reducing burden, improving transition characteristics, and improving welding quality

Inactive Publication Date: 2009-03-18
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the depth of penetration, the appearance of the bead, etc. will change, and the welding quality at the welding start will deteriorate.

Method used

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  • Method for controlling arc length at beginning as consumable electrode gas shielded welding
  • Method for controlling arc length at beginning as consumable electrode gas shielded welding
  • Method for controlling arc length at beginning as consumable electrode gas shielded welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] In Embodiment 1 of the present invention, during the predetermined initial period Ti after the arc is generated at the start of welding, the output control of the welding power supply device is performed so that the welding voltage value Vw and the voltage setting value Vr are approximately equal, and by performing The variable speed control of the welding wire feeding speed Fs quickly converges the arc length to an appropriate value, and after the initial period Ti passes, the welding wire feeding speed is set to a predetermined constant feeding speed Fsc, and the output control of the welding power supply unit , to maintain the arc length at an appropriate value. That is, the feedback control is performed on the voltage error ΔV=Vr−Vw between the voltage setting value Vr and the welding voltage value Vw, and the output control of the welding power supply device and the speed change control of the wire feeding speed Fs are performed simultaneously. Hereinafter, descrip...

Embodiment approach 2

[0045] In the second embodiment of the present invention, in the first embodiment described above, the initial period Ti is changed according to the length of the short-circuit period Ts between the welding wire and the base metal at the start of welding. This is because, as described above, at the start of welding, a typical case where the arc length immediately after arc generation is extremely long is the case where the short-circuit period Ts described above is a long-term short-circuit. In addition, the initial arc length changes according to the time length of the short-circuit period Ts at the start of welding, and as a result, the transition period changes. Therefore, by changing the initial period Ti according to the length of the short-circuit period Ts, it is possible to instantly switch to the arc length control corresponding to the constant state when the arc length converges to a constant state. That is, since the feed variable speed control imposes a load on the...

Embodiment approach 3

[0051] In Embodiment 3 of the present invention, in Embodiment 1 or 2 described above, the wire feed speed Fs determined by the feed shift control in the initial period Ti is limited within a predetermined limit range W. The reason for this is that the wire feeding speed Fs is greatly changed by the wire feeding speed change control based on the voltage error in the initial period Ti. On the other hand, if the change value exceeds the specified range, there may be cases where the arc state becomes unstable due to the wire feeding speed Fs becoming too fast or too slow. Thus, by limiting the wire feed speed Fs determined by the feed variable speed control within a predetermined limit range W, the arc state can be prevented from being unstable. The limit range W is set to a value range that hardly affects the improvement effect of the arc length transition characteristic which is the object of the present invention. Hereinafter, description will be made with reference to the dr...

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Abstract

The invention provides an arc-length control method at starting of gas-shielding arc welding with a consumable electrode. During the predetermined initial period Ti from occurrence of arc at welding start time, the arc-length is quickly settled into the reasonable value Lc so that variable speed control at wire feeding speed Fs is performed in addition to output-control of a welding power supply device so as to approximately equalize both the value Vw of welding voltage and the voltage setup value Vr. Thereby the method is capable of improving a transitional property of an arc-length La during an initial period Ti when the arc-length control method detects the arc-length La with a value Vw of welding voltage at occurrence of arc at a weld-starting time t3 and settles the arc-length La into a reasonable value Lc by output-controlling a welding power supply device so as to approximately equalize the value Vw of welding voltage with a predetermined voltage setup value Vr.

Description

technical field [0001] The invention relates to a method for controlling the arc length at the start of welding, which quickly converges the arc length at the start of welding to a constant state in metal gas shielded arc welding. Background technique [0002] In MIGA welding, when a welding start command is input, the welding wire starts to be fed, and the welding wire contacts the base material to generate an arc. Then, the arc length converges to a constant state after a transition period has elapsed from the time when the arc is generated. The arc length in this transition period exhibits transition characteristics such as overshoot and undershoot. According to various welding conditions such as the material properties of the welding wire, the particle diameter of the tip of the welding wire, the material properties of the base metal, and the surface condition of the base metal, the load state of the welding wire during the transition period will change. There are also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/095B23K9/173B23K9/127B23K9/067B23K9/12
Inventor 仝红军藤堂道隆大西孝典
Owner DAIHEN CORP
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