CN100448585C - Method for controlling length of pulsed gas metal arc welding - Google Patents
Method for controlling length of pulsed gas metal arc welding Download PDFInfo
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- CN100448585C CN100448585C CNB2007100370333A CN200710037033A CN100448585C CN 100448585 C CN100448585 C CN 100448585C CN B2007100370333 A CNB2007100370333 A CN B2007100370333A CN 200710037033 A CN200710037033 A CN 200710037033A CN 100448585 C CN100448585 C CN 100448585C
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Abstract
The invention relates to pulsed gas metal arc welding length control method. Within the pulse cycle time, increase of distance between the solder wire and base material, so does the mean of the welding voltage, increase of the basic value time, progressively reducing of the mean of the welding voltage, till the mean of the welding voltage equals with the given mean voltage for welding. Within the said pulse cycle time, reducing of distance between the solder wire and base material so does the mean of the welding voltage, reducing the basic value time till the mean of the welding voltage equals with the mean given voltage to realize the arc length control. It enjoys higher adjusting precision, sensitivity and stableness.
Description
Technical field
The present invention relates to a kind of control method of welding technology field, specifically is a kind of method for controlling length of pulsed gas metal arc welding.
Background technology
Pulsed gas metal arc welding (GMAW-P) is a kind of high-quality, high efficiency welding procedure, in order to obtain good welding quality, need maintain appropriate value to arc length.Control method at length of pulsed gas metal arc welding is by the control base value time at present, makes weldingvoltage mean value and predefined voltage given value about equally, makes arc length maintain appropriate value.
Find through literature search prior art, Huang Pengfei delivers " pulsed metal argon-arc-welding arc length dynamic adjustments performance study " at " mechanical engineering journal " the 41st volume in January, 2005 the 1st phase, this article adopts " monocycle " control method, adopt arc voltage to make the close loop negative feedback value, by regulating the base value time, make in each pulse period, guarantee that average arc voltage is consistent with given voltage.This control method has adopted digital control technology, carries out the control of arc length in the current pulse period.It is the base value time that but this control method has only adopted single controlled quentity controlled variable, and therefore in welding process, the base value time fluctuation is bigger, thereby causes the change of pulse period bigger, can't keep the uniformity of weld shape, thereby welding quality can be affected also.
Summary of the invention
The objective of the invention is at deficiency of the prior art; a kind of method for controlling length of pulsed gas metal arc welding is provided; improve the controlled of arc length when making it arc length changing in welding process, and guarantee that the pulse period do not have than cataclysm.
The present invention is achieved by the following technical solutions, and the present invention is a kind of method for controlling length of pulsed gas metal arc welding, is specially:
Pulse period comprise between the peak period and base value during two parts, sampled peak voltage and base value voltage between the peak period in a described pulse period and during the base value, and calculate the mean value of weldingvoltage.In the described pulse period, by the control base value time, make weldingvoltage mean value identical, thereby realize the control of arc length with predefined weldingvoltage set-point.
In the described pulse period, when the distance between welding wire and the mother metal increases, the also corresponding increase of described crest voltage and base value voltage, the mean value that is weldingvoltage also can correspondingly increase, and according to the present invention, increases the base value time, the mean value of weldingvoltage reduces gradually, when the mean value of weldingvoltage equals to weld the average voltage set-point, the described base value time finishes, thereby realizes the control of arc length in the described pulse period.
In the described pulse period, when the distance between welding wire and the mother metal reduces, described crest voltage and base value voltage are also corresponding to be reduced, the mean value that is weldingvoltage also can correspondingly reduce, according to the present invention, reduce the base value time, when the mean value of weldingvoltage equals to weld the average voltage set-point, the described base value time finishes, thereby realizes the control of arc length.
In the described pulse period, during base value,,, thereby realize the control of arc length of the base value time output of base value time lower limit as reality when the distance between welding wire and the mother metal reduces and when becoming short-circuit condition, this moment, the base value time remaining was very short.
In the described pulse period, during base value, distance between welding wire and mother metal increases, overstep the extreme limit, in the time of will making arc extinction, the base value time constantly increases, when the base value time exceeds base value time upper limit value, by calculating welding current mean value, and the difference between comparison welding current mean value and the welding current set-point.When welding current mean value during greater than the welding current set-point, the set-point of welding average voltage is reduced accordingly, thereby in the time, realize the control of arc length at short base value, and the variation that guarantees the whole pulse period is little, has guaranteed the uniformity of weld shape.
The invention provides a kind of by interior average voltage of pulse period of control, the controlled length control method for impulse of raising arc length.The control strategy adjustment is flexible, control accuracy is high, the control parametric stability is good.During base value, voltage is 15-23V substantially.When arc length shortens, there is the tendency of short circuit, the voltage during short circuit is lower than 10V substantially.When short-circuit condition took place, the base value time was set to the restriction down of base value time, and the current pulse period is finished very soon, switches to rapidly between the next peak period, has eliminated short-circuit condition.When arc length is elongated, voltage is greater than 23V, the mean value and the welding current set-point that calculate welding current compare, thereby improve the preset value of weldingvoltage accordingly, that is: the welding current mean value that calculates reduces 10A, and weldingvoltage increases 1V accordingly, thereby the weldingvoltage set-point of output table scalariform,, realize the control of arc length, and guarantee that the variation of whole pulse period is little in the time at short base value.
The present invention can either make system keep higher degree of regulation and regulate sensitivity, can guarantee that again system works is stable, guarantee in the welding process that arc length stability improves greatly in the pulse period, realized accurate control, and guarantee stable welding current arc length.
Description of drawings
Fig. 1 represents the oscillogram of method for controlling length of pulsed gas metal arc welding in the inventive embodiments.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Carry out the dull and stereotyped built-up welding test of mild steel, weldingvoltage desired value U with φ 1.2mm H08Mn2Si welding wire
UrlBe 24V, welding current desired value U
Ir100A.Implementation process is as follows:
Source of welding current main circuit as input, detects weldingvoltage by voltage sampling circuit with three-phase 380V AC power, output weldingvoltage sampled signal U
f
Represent as Fig. 1, at moment t
0Distance between welding wire and the mother metal is less than 3mm, and arc length is l
1, the weldingvoltage sampled value is lower than 10V, and in the current pulse period, output is base value restricted T under the time base value time
b Lower limit, finished, the current pulse period very soon at moment t
1Switch to a new pulse period, the output peak point current is eliminated short-circuit condition rapidly, makes arc length remain on stable length.At moment t
3Distance between welding wire and the mother metal is greater than 25mm, and promptly arc length variations is to l
3,, corresponding peaks voltage sample value and base value voltage sample value all increase.Simultaneously, the sampling welding current and calculate welding current and the welding current set-point between difference.When the welding current sampled value is lower than welding current set-point 10A, promptly at t
4Constantly, the weldingvoltage set-point is increased 1V, at t
2Constantly, the current pulse period finishes, and so still can guarantee to realize the stable of arc length in the time at short base value, and guarantee that the variation of whole pulse period is little.In normal welding process, arc length maintains l substantially
2In whole welding process, the actual electric current of welding remains on 98-102A substantially, and weldingvoltage maintains 23-24V substantially, is consistent substantially with predetermined target value.
Claims (2)
1, a kind of method for controlling length of pulsed gas metal arc welding, it is characterized in that: in the pulse period, when the distance between welding wire and the mother metal increases, the also corresponding increase of crest voltage and base value voltage, promptly the mean value of weldingvoltage also can correspondingly increase, and increases the base value time, the mean value of weldingvoltage reduces gradually, when the mean value of weldingvoltage equals to weld the average voltage set-point, the described base value time finishes, thereby realizes the control of arc length in the described pulse period;
In the described pulse period, when the distance between welding wire and the mother metal reduces, described crest voltage and base value voltage are also corresponding to be reduced, the mean value that is weldingvoltage also can correspondingly reduce, reduce the base value time, when the mean value of weldingvoltage equals to weld the average voltage set-point, the described base value time finishes, thereby realizes the control of arc length;
In the described pulse period, during base value, distance between welding wire and mother metal increases, overstep the extreme limit, in the time of will making arc extinction, the base value time constantly increases, when the base value time exceeds base value time upper limit value, by calculating welding current mean value, and the difference between comparison welding current mean value and the welding current set-point; When welding current mean value during greater than the welding current set-point, the set-point of welding average voltage is reduced accordingly, thereby in the time, realize the control of arc length at short base value, and the variation that guarantees the whole pulse period is little, has guaranteed the uniformity of weld shape.
2, method for controlling length of pulsed gas metal arc welding according to claim 1; it is characterized in that; in the described pulse period; during base value; when the distance between welding wire and the mother metal reduces and becomes short-circuit condition; this moment, the base value time remaining was very short, of the base value time output of base value time lower limit as reality, thus the control of realization arc length.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100370333A CN100448585C (en) | 2007-02-01 | 2007-02-01 | Method for controlling length of pulsed gas metal arc welding |
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| CNB2007100370333A CN100448585C (en) | 2007-02-01 | 2007-02-01 | Method for controlling length of pulsed gas metal arc welding |
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| CN100448585C true CN100448585C (en) | 2009-01-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108031952A (en) * | 2017-12-21 | 2018-05-15 | 唐山松下产业机器有限公司 | Control method, device, medium and the electronic equipment of gas metal-arc welding |
Families Citing this family (8)
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| JP5149750B2 (en) * | 2008-07-30 | 2013-02-20 | 株式会社ダイヘン | Inconel overlay welding method by AC pulse arc welding |
| CN101406980B (en) * | 2008-11-21 | 2011-04-27 | 北京工业大学 | Method for controlling length of electric arc |
| CN102126077B (en) * | 2010-01-12 | 2014-09-17 | 株式会社大亨 | Plasma metal inert gas arc welding method |
| CN102873435B (en) * | 2012-09-25 | 2014-07-09 | 北京工业大学 | Gas metal arc welding method and system |
| CN108247178B (en) * | 2016-12-29 | 2021-06-08 | 株式会社达谊恒 | Output control method for AC pulse arc welding |
| US11969835B2 (en) * | 2019-03-26 | 2024-04-30 | Lincoln Global, Inc. | Tip saver for a welding system |
| CN111001908B (en) * | 2019-12-26 | 2021-09-17 | 唐山松下产业机器有限公司 | Consumable electrode pulse welding method, consumable electrode pulse welding system and consumable electrode pulse welding machine |
| CN113770488B (en) * | 2021-10-13 | 2022-09-27 | 上海交通大学 | Arc length control method for short circuit transition of pulse gas metal arc welding |
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| EP1514628A1 (en) * | 2003-09-12 | 2005-03-16 | Daihen Corporation | Pulse arc welding output control method and arc length variation pulse arc welding output control method |
| JP2006231414A (en) * | 2006-05-30 | 2006-09-07 | Daihen Corp | Method for controlling start of arc |
| CN1836818A (en) * | 2005-03-23 | 2006-09-27 | 株式会社大亨 | Arc length control method for impulse arc welding |
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| EP1514628A1 (en) * | 2003-09-12 | 2005-03-16 | Daihen Corporation | Pulse arc welding output control method and arc length variation pulse arc welding output control method |
| CN1836818A (en) * | 2005-03-23 | 2006-09-27 | 株式会社大亨 | Arc length control method for impulse arc welding |
| JP2006231414A (en) * | 2006-05-30 | 2006-09-07 | Daihen Corp | Method for controlling start of arc |
Non-Patent Citations (2)
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| 熔化极脉冲氩弧焊弧长动态调节性能研究. 黄鹏飞，卢振洋，吕耀辉，殷树言.机械工程学报，第41卷第1期. 2005 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108031952A (en) * | 2017-12-21 | 2018-05-15 | 唐山松下产业机器有限公司 | Control method, device, medium and the electronic equipment of gas metal-arc welding |
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