CN1291534A - Pulse optical spectrum control method for protecting molten electrode drops by gas - Google Patents
Pulse optical spectrum control method for protecting molten electrode drops by gas Download PDFInfo
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- CN1291534A CN1291534A CN 00131566 CN00131566A CN1291534A CN 1291534 A CN1291534 A CN 1291534A CN 00131566 CN00131566 CN 00131566 CN 00131566 A CN00131566 A CN 00131566A CN 1291534 A CN1291534 A CN 1291534A
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Abstract
An optical spectrum control method for protecting the molten drop transmission by gas in the pulse electrode-smelting gas protection weld include such steps as determining the test cross-secting of arc and molten drop, using optical spectrum detection system, selecting characteristic spectrum lines, converting it to electric signals by photoelectric coverter, A/D conversion, inputting to microcomputer to process and output control signals, PWM modulation to output drive pulse signal, and driving the high-voltage switch-transistor of inverser. Its advantages include one pulse for one drop, high control accuracy, and convenient in-line regulation.
Description
The present invention relates to the spectral control method of a kind of pulsed gas metal arc welding droplet transfer.Be to belong to the gas metal-arc welding process control technology.
Pulsed gas metal arc welding; because its welding current and the pulsation controllability of droplet transfer; broad Current Regulation scope is arranged in addition; thereby become a kind of welding technology of industrial widespread use; it has the controlled thermal input, improves property of welded joint, and appearance of weld is good; Technological adaptability is wide, is specially adapted to the advantages such as welding of thermo-sensitive material and non-ferrous metal.
One of gordian technique of gas metal-arc welding is the control method of droplet transfer.To this, adopting the transducing signal majority of control both at home and abroad at present is electric signal, and this transducing signal can not reflect the physical process of molten drop process truly, and then also just can not accurately control the droplet transfer, influences the raising of welding quality.Having occurred a kind of light intensity of electric arc of utilizing in recent years controls the droplet transfer as control signal, the light intensity of being utilized is the mixed light that has mixed multidimensional information, non-single spectrum, thereby the weak strength of its useful signal, poor anti jamming capability, Technological adaptability is poor, and range of application is narrow.
Purpose of the present invention is to provide the spectral control method of a kind of pulsed gas metal arc welding droplet transfer.This control method not only can realize control of an arteries and veins, and has online easy to adjustly, and it is wide to adapt to processing range, the characteristics that appearance of weld is good.
For achieving the above object, the present invention is realized by following technical proposals.Determine the testing section of electric arc and molten drop, utilize the spectral detection system, selecting characteristic spectral line, is the electric signal of sufficient intensity by photoelectric commutator with the characteristic spectrum conversion of signals again, after A/D conversion system is handled, the input MICROCOMPUTER PROCESSING, the control signal of output by the modulation of PWM controller, is exported drive pulse signal again, drives the IGBT injectron of inverter current, implement the action of shear electric current, reach the control purpose of one in an arteries and veins.It is characterized in that: the spectrum pulse signal that is manifested of 1, gathering generation according to molten drop, growth, drippage process; 2, get the control signal of the some correspondence that is lower than peak value in the descending branch of spectrum pulse waveform signal,, pulse peak current is switched to background current through feedback rear drive inverter injectron; 3, carry out real-time sampling when control,, suitably regulate the width of current impulse by choosing and changing point on the diverse location on the spectrum pulse waveform descending branch.
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is a control system structural representation of the present invention.
The synoptic diagram of Fig. 2 droplet transfer process and spectral signal relation.
The example of the pulse MIC welding spectral signal waveform that Fig. 3 spectral detection of the present invention system is measured (argon flow amount 20L/min φ 1.2 dry extension of electrode 16mm pulsed frequency 83Hz).
Switchover policy welds the pulse MIC welding electric current that control obtains and the example (argon flow amount 20L/min φ 1.0 dry extension of electrode 16mm Gs=80%) of spectral signal waveform with different welding conditions with after adopting spectrum peak in Fig. 4 the present invention.
1 is electric arc and molten drop among Fig. 1, and 2 is the spectral detection system, and 3 is photoelectric commutator, and 4 is microsystem, and 5 is the PWM pulse width modulator, and 6 is inversion welding source.
As seen from Figure 1, the pulse arc light is selected characteristic spectral line through the spectral detection system, obtains reflecting the characteristic spectrum signal of droplet transfer physical process.This system detects from mixed light that intensity height, antijamming capability are strong, the single light of reflection droplet transfer.This single light converts 0～5V electric signal of sufficient intensity again to through photoelectric commutator, this electric signal input microsystem, gather in real time, handle and judge, in case detected molten drop generation transition, microcomputer output control signal, width modulation effect by the PWM controller, the output drive pulse signal, drive the IGBT injectron of inverter, rapidly peak point current is switched to background current, the continuation that can limit pulse energy like this increases or accumulation, realizes the pulsatile once electric current, the purpose of a molten drop of transition.
As shown in Figure 2, the formed spectrum pulse signal waveform of the generation of molten drop, development and drippage process.(A)～(C) is the molten drop generation phase among the figure, and corresponding waveform is the ascent stage, and (D)～(E) the expression molten drop comes off stage and drip to test surfaces tangently, and light intensity reaches maximum, forms the extreme value section of waveform.(F)～(H) figure shows that molten drop leaves testing section and drips to the molten bath, this moment light intensity by strong to weak to minimum value, corresponding waveform is a descending branch.
As seen from Figure 3, detection system of the present invention not only can detect the spectral signal of the droplet transfer of 1 peak, 0 base exactly in real time, and can detect 2 peaks, 0 base equally, 3 peaks, 0 base, and the spectral signal of 1 peak, 1 base, and signal quality is very high, and it is fine to detect effect.
As seen from Figure 4, change peak point current Ip (a of Fig. 4, b, c, d) or background current I no matter be
bWhen (e of Fig. 4, f, g, h), all corresponding spectrum pulse illustrate all to have obtained the excessive of 1 peak, 0 base during each current peak, has realized the accurate control of one in the arteries and veins of droplet transfer.If change pulsed frequency, can obtain the accurate control of 1 peak, 0 base equally.The control effect is fine.
But the droplet transfer of the present invention's paired pulses gas metal-arc welding is realized reliable and stable detection and control, has the control accuracy height, and online easy to adjust, Technological adaptability is wide, and welding process is stable, the characteristics that appearance of weld is good.It not only can be used for the control of 1 peak, 0 base, and, with the control strategy change that adds up, also can be used for the real-time control of the droplet transfer of 2 peaks, 0 base or 3 peaks, 0 base, applied range.
Claims (1)
1, the spectral control method of a kind of pulsed gas metal arc welding droplet transfer, its process is, determine the testing section of electric arc and molten drop, utilize the spectral detection system, select characteristic spectral line, with the characteristic spectrum conversion of signals electric signal of sufficient intensity by photoelectric commutator again, after A/D conversion system is handled, input MICROCOMPUTER PROCESSING, the control signal of output by the modulation of PWM controller, are exported drive pulse signal again, drive the IGBT injectron of inverter current, implement the action of shear electric current, reach the control purpose of one in an arteries and veins, it is characterized in that: a, collection is according to the generation of molten drop, grow up, the spectrum pulse signal that is manifested of drippage process; B, get the control signal of the some correspondence that is lower than peak value,, pulse peak current is switched to background current through feedback rear drive inverter injectron in the descending branch of spectrum pulse waveform signal; C, carry out real-time sampling when control,, suitably regulate the width of current impulse by choosing and changing point on the diverse location on the spectrum pulse waveform descending branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001315668A CN1141198C (en) | 2000-10-27 | 2000-10-27 | Pulse optical spectrum control method for protecting molten electrode drops by gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001315668A CN1141198C (en) | 2000-10-27 | 2000-10-27 | Pulse optical spectrum control method for protecting molten electrode drops by gas |
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| Publication Number | Publication Date |
|---|---|
| CN1291534A true CN1291534A (en) | 2001-04-18 |
| CN1141198C CN1141198C (en) | 2004-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB001315668A Expired - Fee Related CN1141198C (en) | 2000-10-27 | 2000-10-27 | Pulse optical spectrum control method for protecting molten electrode drops by gas |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143822A (en) * | 2008-09-03 | 2011-08-03 | 柏林工业大学 | Method for regulating energy input of a pulsed arc plasma during a joining process and apparatus |
| CN113977039A (en) * | 2021-10-27 | 2022-01-28 | 吉林大学 | Pulse consumable electrode argon arc welding molten drop transition monitoring device and control method |
| CN114354282A (en) * | 2022-01-13 | 2022-04-15 | 东北大学 | Device and method for submerged arc welding molten drop acquisition and arc plasma characterization |
| CN115383260A (en) * | 2022-10-11 | 2022-11-25 | 湘潭大学 | GTAW process molten drop transition frequency control method based on arc sensing |
-
2000
- 2000-10-27 CN CNB001315668A patent/CN1141198C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143822A (en) * | 2008-09-03 | 2011-08-03 | 柏林工业大学 | Method for regulating energy input of a pulsed arc plasma during a joining process and apparatus |
| CN113977039A (en) * | 2021-10-27 | 2022-01-28 | 吉林大学 | Pulse consumable electrode argon arc welding molten drop transition monitoring device and control method |
| CN114354282A (en) * | 2022-01-13 | 2022-04-15 | 东北大学 | Device and method for submerged arc welding molten drop acquisition and arc plasma characterization |
| CN115383260A (en) * | 2022-10-11 | 2022-11-25 | 湘潭大学 | GTAW process molten drop transition frequency control method based on arc sensing |
| CN115383260B (en) * | 2022-10-11 | 2024-05-07 | 湘潭大学 | GTAW process droplet transition frequency control method based on arc sensing |
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| Publication number | Publication date |
|---|---|
| CN1141198C (en) | 2004-03-10 |
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