CN103658932A - Control method and circuit for improving arc striking time sequence - Google Patents
Control method and circuit for improving arc striking time sequence Download PDFInfo
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- CN103658932A CN103658932A CN201310658862.9A CN201310658862A CN103658932A CN 103658932 A CN103658932 A CN 103658932A CN 201310658862 A CN201310658862 A CN 201310658862A CN 103658932 A CN103658932 A CN 103658932A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003466 welding Methods 0.000 claims abstract description 57
- 238000010891 electric arc Methods 0.000 claims abstract description 29
- 238000010586 diagram Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 235000018734 Sambucus australis Nutrition 0.000 description 1
- 244000180577 Sambucus australis Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- OGFXBIXJCWAUCH-UHFFFAOYSA-N meso-secoisolariciresinol Natural products C1=2C=C(O)C(OC)=CC=2CC(CO)C(CO)C1C1=CC=C(O)C(OC)=C1 OGFXBIXJCWAUCH-UHFFFAOYSA-N 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
- B23K9/0672—Starting the arc without direct contact between electrodes
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- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Abstract
The invention discloses a control method and circuit for improving an arc striking time sequence. The method includes the steps that the positive pole output end of a welding machine and a workpiece are electrically connected; pulse width modulation signals are output to the positive pole output end of the welding machine and the negative pole output end of the welding machine periodically, and the duty ratio of the pulse width modulation signals is lower than or equal to 10%; whether the negative pole output end of the welding machine is in contact with the workpiece or not is detected, if the negative pole output end is in contact with the workpiece, the pulse width modulation signals generate shorcircuit circuit between the positive pole output end and the negative pole output end, and an electric arc is built between the positive pole output end and the negative pole output end; after the electric arc is ignited, working voltage generates high-temperature electric arc between the positive pole output end and the negative pole output end to process the workpiece, and the pulse width modulation signals are output continuously and periodically to the positive pole output end of the welding machine and the negative pole output end of the welding machine. Due to the fact that the pulse width modulation signals with the pulse width lower than or equal to 10% are used as time sequence signals of arc striking, the problem of bonding of the negative pole output end and the workpiece can be avoided.
Description
Technical field
The present invention relates to SECO technical field, especially a kind of control method and control circuit that promotes striking sequential.
Background technology
The welding gun of electric welding machine and workpiece transcient short circuit time, then the electric arc that need to ignite utilize electric arc to reach the technique of welding.Common striking scheme has two kinds at present, and a kind of is to increase a boost voltage at output two ends, and utilizes boost voltage to detect and judge whether welding gun contacts with workpiece, and then the electric arc that ignites.Yet, at welding gun and workpiece Contact, because of the peak current overshoot producing during short circuit, cause the problem of sticky rifle.Another kind of striking scheme is to add back ground current and boost voltage at output, after welding gun and workpiece short circuit, during lifting, rely on back ground current to carry out pilot arc, while rising to certain voltage, trigger again welding machine work, export preset welding current, this method has very outstanding striking performance, but cost is too high.
Summary of the invention
Based on this, the invention reside in the defect that overcomes prior art, a kind of control method and control circuit that promotes striking sequential is provided.
Its technical scheme is as follows:
A control method that promotes striking sequential, comprises the following steps:
Be electrically connected cathode output end and the workpiece of welding machine;
Periodically output pulse width modulation signal is to cathode output end and the cathode output end of welding machine, and the dutycycle of described pulse width modulating signal is less than or equal to 10%;
Whether the cathode output end of surveying welding machine contacts with workpiece, if cathode output end contacts with workpiece, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, sets up electric arc;
Ignite after electric arc, operating voltage produces high-temperature electric arc workpiece is processed between cathode output end and cathode output end, continues periodically output pulse width modulation signal to cathode output end and the cathode output end of welding machine.
For the short circuit current producing due to cathode output end and workpiece Contact, pulse width modulating signal produces, and the pulsewidth of described pulse width modulating signal is less than or equal to 10%, belongs to narrow pulse width signal.For the short circuit current of safeguarding, may only need 5% pulsewidth, so it is a very little current over pulse that initial pulsewidth is modulated to 5% from 10%, therefore short circuit current is little and can overshoot, the problem of mutually clinging of effectively having avoided output to cause because of short circuit current overshoot before welding and between workpiece, that is to say the sticky rifle problem of having avoided industry alleged.Again due to after the electric arc that ignites, pulse width modulating signal continues periodically to export to the output of welding machine, the little short circuit current that is to say the generation between cathode output end and cathode output end at the pulse width modulating signal that utilizes narrow pulsewidth is done the work of pilot arc, thereby effectively prevents disconnected fox.Because pulse width modulating signal is simultaneously as the triggering signal of striking sequential, also, as the signal of pilot arc, reduced cost.
Further, while producing short circuit current between cathode output end and cathode output end, control module is set up welding arc after receiving welding gun lifting signal between cathode output end and cathode output end.
Further, after striking success, described pulse width modulating signal continues output, the pulse width of described pulse width modulating signal and the output current of welding machine be varied to the corresponding variation of direct ratio.
Further, the cycle of described pulse width modulating signal is less than or equal to 50 microseconds, is less than or equal in 10 milliseconds of times output pulse width modulation signal to cathode output end and the cathode output end of welding machine in every 100 milliseconds.
A control circuit that promotes striking sequential, comprising:
Pwm unit, for periodically output pulse width modulation signal is to cathode output end and the cathode output end of welding machine, the dutycycle of described pulse width modulating signal is less than or equal to 10%;
Striking unit, for contacting with workpiece at cathode output end, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, sets up electric arc;
Power main circuit, for after the electric arc that ignites, output services voltage goes out between end, to produce high-temperature electric arc workpiece is processed at cathode output end and negative pole.
For the short circuit current producing due to cathode output end and workpiece Contact, pulse width modulating signal produces, and the pulsewidth of described pulse width modulating signal is less than or equal to 10%, belongs to narrow pulse width signal.For the short circuit current of safeguarding, may only need 5% pulsewidth, so it is a very little current over pulse that initial pulsewidth is modulated to 5% from 10%, therefore short circuit current is little and can overshoot, the problem of mutually clinging of effectively having avoided output to cause because of short circuit current overshoot before welding and between workpiece, that is to say the sticky rifle problem of having avoided industry alleged.
Further, the control circuit that promotes striking sequential also comprises control module, for surveying the negative pole of welding machine, go out end and whether contact with workpiece, if cathode output end contacts with workpiece, while producing short circuit current between cathode output end and cathode output end, receive short circuit current signal and trigger and set up electric arc between cathode output end and cathode output end.
Further, the cycle of described pulse width modulating signal is less than or equal to 50 microseconds, is less than or equal in 10 milliseconds of times output pulse width modulation signal to cathode output end and the cathode output end of welding machine in every 100 milliseconds.
Accompanying drawing explanation
Fig. 1 is the flow chart that promotes the control method of striking sequential described in the embodiment of the present invention.
Fig. 2 is the connection diagram that promotes the control circuit of striking sequential described in the embodiment of the present invention.
Fig. 3 is dutycycle and the cycle schematic diagram of pulse width modulating signal that promotes the control method of striking sequential described in the embodiment of the present invention.
Description of reference numerals: 100, promote the control circuit of striking sequential, 10, pwm unit, 20, striking unit, 30, power main circuit, 40, control module.
The specific embodiment
Below embodiments of the invention are elaborated:
As Figure 1-3, the control method of the lifting striking sequential described in the embodiment of the present invention comprises the following steps:
S1: the cathode output end and the workpiece that are electrically connected welding machine;
Particularly, described welding machine is electric welding machine, employing be gas tungsten arc welding.Described workpiece is metal alloy compositions, and it has electric conductivity and fusing point is lower.
S2: periodically output pulse width modulation signal is to cathode output end and the cathode output end of welding machine, and the dutycycle of described pulse width modulating signal is less than or equal to 10%;
In the present embodiment, the cycle of described pulse width modulating signal equals 50 microseconds, in 10 milliseconds of times in every 100 milliseconds, output pulse width modulation signal is to cathode output end and the cathode output end of welding machine, and all the other 90 milliseconds all do not have pulse width modulating signal.Because the frequency of pulse width modulating signal is high, and the dutycycle of every section of pulse width modulating signal is little, therefore short circuit current that, cathode output end and workpiece Contact are produced by the pulse width modulating signal of described narrow pulsewidth and coreless induction furnace is little and can overshoot.For the short circuit current of safeguarding, may only need 5% pulsewidth, it is a very little current over pulse that the initial pulsewidth of control method of lifting striking sequential of the present invention is modulated to 5% from 10%, avoided wide pulse width of the prior art (at transcient short circuit time, generally be greater than 40%) modulation band small-pulse effect, that is to say that 40% is modulated to the very large overshoot producing in 5% this process, sticky rifle while causing short circuit, the problem that is difficult to carry out welding gun lifting.
S3: whether the cathode output end of surveying welding machine contacts with workpiece, if cathode output end contacts with workpiece, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, sets up electric arc between cathode output end and cathode output end;
Particularly, when whether cathode output end contacts with workpiece, between cathode output end and cathode output end, produce short circuit current, control module is set up welding arc after receiving welding gun lifting signal between cathode output end and cathode output end.
S4: ignite after electric arc, operating voltage produces high-temperature electric arc workpiece is processed between positive pole and cathode output end, continues periodically output pulse width modulation signal to cathode output end and the cathode output end of welding machine.
Particularly, after striking success, described pulse width modulating signal continues output, the pulse width of described pulse width modulating signal and the output current of welding machine be varied to the corresponding variation of direct ratio, output current is larger, pulse width is just larger.
The control method of lifting striking sequential of the present invention as control, can be simplified control module by the single-chip microcomputer of programming language that writes above-mentioned steps S1-S4, and is conducive to the miniaturization development of control module.
For the short circuit current producing due to cathode output end and workpiece Contact, pulse width modulating signal produces, and the pulsewidth of described pulse width modulating signal is less than or equal to 10%, belongs to narrow pulse width signal.For the short circuit current of safeguarding, may only need 5% pulsewidth, so it is a very little current over pulse that initial pulsewidth is modulated to 5% from 10%, therefore short circuit current is little and can overshoot, the problem of mutually clinging of effectively having avoided output to cause because of short circuit current overshoot before welding and between workpiece, contributes to the lifting of welding gun operating efficiency.In the present embodiment, the pulse width modulating signal of described narrow pulsewidth has been avoided the problem of clinging between tungsten electrode and workpiece effectively.Again due to after the electric arc that ignites, pulse width modulating signal continues periodically to export to the cathode output end of welding machine, that is to say that the little short circuit current of the generation between cathode output end and cathode output end at the pulse width modulating signal that utilizes narrow pulsewidth does the work of pilot arc.Because impulse amplitude is along with the proportional variation of output current, therefore avoided the too small situation of pulse width.Utilize the condition that pulse width is enough little but be unlikely to too little condition, at cathode output end, that is to say that when welding gun leaves workpiece in short-term, holding circuit can not break, in pilot arc effectively, also avoided the problem of sticky rifle.
Understandably, at short circuit current, can survey and obtain and can pilot arc in the situation that, the cycle of pulse width modulating signal be shorter, dutycycle is less, can more effectively avoid the problem of sticky rifle.And pulse width modulating signal as the triggering signal of striking sequential, also, as the signal of pilot arc, has reduced cost simultaneously.
The control circuit 100 of the lifting striking sequential of the lifting striking sequential described in the embodiment of the present invention comprises: pwm unit 10, for periodically output pulse width modulation signal is to cathode output end and the cathode output end of welding machine, the dutycycle of described pulse width modulating signal is less than or equal to 10%; Striking unit 20, for contacting with workpiece at cathode output end, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, sets up electric arc; Power main circuit 30, for after the electric arc that ignites, output services voltage goes out between end, to produce high-temperature electric arc workpiece is processed at cathode output end and negative pole.The control circuit 100 that promotes striking sequential also comprises control module 40, for surveying the cathode output end of welding machine, whether contact with workpiece, if cathode output end contacts with workpiece, while producing short circuit current between cathode output end and cathode output end, receive short circuit current signal and trigger at the cathode output end electric arc that ignites.
The above embodiment has only expressed the specific embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (7)
1. a control method that promotes striking sequential, is characterized in that, comprises the following steps:
Be electrically connected cathode output end and the workpiece of welding machine;
Periodically output pulse width modulation signal is to cathode output end and the cathode output end of welding machine, and the dutycycle of described pulse width modulating signal is less than or equal to 10%;
Whether the cathode output end of surveying welding machine contacts with workpiece, if cathode output end contacts with workpiece, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, sets up electric arc;
Ignite after electric arc, operating voltage produces high-temperature electric arc workpiece is processed between cathode output end and cathode output end, continues periodically output pulse width modulation signal to cathode output end and the cathode output end of welding machine.
2. the control method of lifting striking sequential as claimed in claim 1, it is characterized in that, while producing short circuit current between cathode output end and cathode output end, control module is set up welding arc after receiving welding gun lifting signal between cathode output end and cathode output end.
3. the control method of lifting striking sequential as claimed in claim 1, it is characterized in that, after striking success, described pulse width modulating signal continues output, the pulse width of described pulse width modulating signal and the output current of welding machine be varied to the corresponding variation of direct ratio.
4. the control method of the lifting striking sequential as described in claim 1-3 any one, it is characterized in that, the cycle of described pulse width modulating signal is less than or equal to 50 microseconds, is less than or equal in 10 milliseconds of times output pulse width modulation signal to cathode output end and the cathode output end of welding machine in every 100 milliseconds.
5. a control circuit that promotes striking sequential, is characterized in that, comprising:
Pwm unit, for periodically output pulse width modulation signal is to cathode output end and the cathode output end of welding machine, the dutycycle of described pulse width modulating signal is less than or equal to 10%;
Striking unit, for contacting with workpiece at cathode output end, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, sets up electric arc;
Power main circuit, for after the electric arc that ignites, output services voltage goes out between end, to produce high-temperature electric arc workpiece is processed at cathode output end and negative pole.
6. the control circuit of lifting striking sequential as claimed in claim 5, it is characterized in that, also comprise control module, for surveying the negative pole of welding machine, go out end and whether contact with workpiece, if cathode output end contacts with workpiece, while producing short circuit current between cathode output end and cathode output end, receive short circuit current signal and trigger and set up electric arc between cathode output end and cathode output end.
7. the control circuit of the lifting striking sequential as described in claim 5 or 6, it is characterized in that, the cycle of described pulse width modulating signal is less than or equal to 50 microseconds, is less than or equal in 10 milliseconds of times output pulse width modulation signal to cathode output end and the cathode output end of welding machine in every 100 milliseconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310658862.9A CN103658932B (en) | 2013-12-06 | 2013-12-06 | Promote control method and the control circuit of striking sequential |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310658862.9A CN103658932B (en) | 2013-12-06 | 2013-12-06 | Promote control method and the control circuit of striking sequential |
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| CN103658932A true CN103658932A (en) | 2014-03-26 |
| CN103658932B CN103658932B (en) | 2016-03-30 |
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Citations (5)
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|---|---|---|---|---|
| JPH04270069A (en) * | 1991-02-26 | 1992-09-25 | Daihen Corp | Method for controlling arc start of pulse mag welding |
| JPH09253846A (en) * | 1996-03-25 | 1997-09-30 | Tokyo Gas Co Ltd | Measuring method for electric characteristics of welding equipment |
| CN102672308A (en) * | 2012-05-10 | 2012-09-19 | 刘裕国 | Touch arc striking electric welding machine and electric welding touch arc striking control method |
| CN202591804U (en) * | 2012-05-10 | 2012-12-12 | 刘裕国 | Contact arc striking electric welding machine |
| CN203184801U (en) * | 2013-02-28 | 2013-09-11 | 广州市长胜焊接设备实业有限公司 | Automatic thrust arc striking device of digital inversion arc welder |
-
2013
- 2013-12-06 CN CN201310658862.9A patent/CN103658932B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04270069A (en) * | 1991-02-26 | 1992-09-25 | Daihen Corp | Method for controlling arc start of pulse mag welding |
| JPH09253846A (en) * | 1996-03-25 | 1997-09-30 | Tokyo Gas Co Ltd | Measuring method for electric characteristics of welding equipment |
| CN102672308A (en) * | 2012-05-10 | 2012-09-19 | 刘裕国 | Touch arc striking electric welding machine and electric welding touch arc striking control method |
| CN202591804U (en) * | 2012-05-10 | 2012-12-12 | 刘裕国 | Contact arc striking electric welding machine |
| CN203184801U (en) * | 2013-02-28 | 2013-09-11 | 广州市长胜焊接设备实业有限公司 | Automatic thrust arc striking device of digital inversion arc welder |
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| 中国机械工程学会焊接学会: "《焊接手册-焊接方法及设备》", 31 August 2008 * |
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| 王宗杰: "《熔焊方法及设备》", 31 December 2006, 机械工业出版社 * |
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