CN103658932B - Promote control method and the control circuit of striking sequential - Google Patents
Promote control method and the control circuit of striking sequential Download PDFInfo
- Publication number
- CN103658932B CN103658932B CN201310658862.9A CN201310658862A CN103658932B CN 103658932 B CN103658932 B CN 103658932B CN 201310658862 A CN201310658862 A CN 201310658862A CN 103658932 B CN103658932 B CN 103658932B
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- China
- Prior art keywords
- output end
- cathode output
- pulse width
- striking
- welding machine
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000003466 welding Methods 0.000 claims abstract description 55
- 238000010891 electric arc Methods 0.000 claims abstract description 30
- 238000010521 absorption reaction Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 230000001737 promoting effect Effects 0.000 claims description 10
- 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
- 239000003292 glue Substances 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
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a kind of cathode output end and the workpiece that are electrically connected welding machine; Periodically output pulse width modulation signal is to the cathode output end of welding machine and cathode output end, and the dutycycle of described pulse width modulating signal is less than or equal to 10%; The cathode output end of detection welding machine whether with absorption surface, if cathode output end and absorption surface, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, set up electric arc; Ignite after electric arc, operating voltage produces high-temperature electric arc and processes workpiece between cathode output end and cathode output end, and durations ground output pulse width modulation signal is to the cathode output end of welding machine and cathode output end.Owing to utilizing pulsewidth to be less than or equal to the pulse width modulating signal of 10% as the clock signal of striking, the problem that cathode output end and workpiece cling mutually can be avoided.
Description
Technical field
The present invention relates to SECO technical field, especially a kind of control method and control circuit promoting striking sequential.
Background technology
The welding gun of electric welding machine and workpiece transcient short circuit time, then the electric arc that needs to ignite utilize electric arc to reach the technique of welding.Striking scheme common at present has two kinds, and one increases a boost voltage at output two ends, and utilize boost voltage to detect and judge whether welding gun contacts with workpiece, and then the electric arc that ignites.But, cause the problem of sticky rifle instantaneously because of the peak current overshoot produced during short circuit at welding gun and absorption surface.Another kind of striking scheme adds back ground current and boost voltage at output, after welding gun and workpiece short circuit, back ground current is relied on to carry out pilot arc during lifting, welding machine work is triggered again when rising to certain voltage, 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 overcoming prior art, a kind of control method and the control circuit that promote striking sequential are provided.
Its technical scheme is as follows:
Promote a control method for striking sequential, comprise the following steps:
Be electrically connected cathode output end and the workpiece of welding machine;
Periodically output pulse width modulation signal is to the cathode output end of welding machine and cathode output end, and the dutycycle of described pulse width modulating signal is less than or equal to 10%;
The cathode output end of detection welding machine whether with absorption surface, if cathode output end and absorption surface, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, set up electric arc;
Ignite after electric arc, operating voltage produces high-temperature electric arc and processes workpiece between cathode output end and cathode output end, and durations ground output pulse width modulation signal is to the cathode output end of welding machine and cathode output end.
The short circuit current pulse width modulating signal produced due to cathode output end and absorption surface moment produces, and the pulsewidth of described pulse width modulating signal is less than or equal to 10%, belongs to narrow spaces signal.Short circuit current for safeguarding only may need the pulsewidth of 5%, 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 not overshoot, effectively prevent output before welding and the problem of mutually clinging caused because of short circuit current overshoot between workpiece, that is to say the sticky rifle problem avoided alleged by industry.Again due to after the electric arc that ignites, export the output of welding machine to pulse width modulating signal durations, that is to say that the little short circuit current in the generation utilizing the pulse width modulating signal of narrow spaces between cathode output end and cathode output end does the work of pilot arc, thus effectively prevent disconnected fox.Because pulse width modulating signal is simultaneously as the triggering signal of striking sequential, also as the signal of pilot arc, reduce cost.
Further, when producing short circuit current between cathode output end and cathode output end, control unit sets up welding arc after receiving welding gun promotion signal between cathode output end and cathode output end.
Further, when after striking success, described pulse width modulating signal continues to export, and the pulse width of described pulse width modulating signal is changing into the corresponding change of direct ratio with the output current of welding machine.
Further, the cycle of described pulse width modulating signal is less than or equal to 50 microseconds, is less than or equal to output pulse width modulation signal in 10 milliseconds of times to the cathode output end of welding machine and cathode output end in every 100 milliseconds.
Promote a control circuit for striking sequential, comprising:
Pwm unit, for periodically output pulse width modulation signal to the cathode output end of welding machine and cathode output end, the dutycycle of described pulse width modulating signal is less than or equal to 10%;
Striking unit, at cathode output end and absorption surface, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, set up electric arc;
Power main circuit, for after the electric arc that ignites, output services voltage produces high-temperature electric arc and processes workpiece between cathode output end and negative pole go out to hold.
The short circuit current pulse width modulating signal produced due to cathode output end and absorption surface moment produces, and the pulsewidth of described pulse width modulating signal is less than or equal to 10%, belongs to narrow spaces signal.Short circuit current for safeguarding only may need the pulsewidth of 5%, 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 not overshoot, effectively prevent output before welding and the problem of mutually clinging caused because of short circuit current overshoot between workpiece, that is to say the sticky rifle problem avoided alleged by industry.
Further, the control circuit promoting striking sequential also comprises control unit, negative pole for detecting welding machine go out end whether with absorption surface, if cathode output end and absorption surface, when 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 to output pulse width modulation signal in 10 milliseconds of times to the cathode output end of welding machine and cathode output end in every 100 milliseconds.
Accompanying drawing explanation
Fig. 1 is the flow chart of the control method promoting striking sequential described in the embodiment of the present invention.
Fig. 2 is the connection diagram of the control circuit promoting striking sequential described in the embodiment of the present invention.
Fig. 3 is dutycycle and the cycle schematic diagram of the pulse width modulating signal of the control method promoting striking sequential described in the embodiment of the present invention.
Description of reference numerals: the control circuit 100, promoting striking sequential, 10, pwm unit, 20, striking unit, 30, power main circuit, 40, control unit.
Detailed description of the invention
Below embodiments of the invention are described in detail:
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 the cathode output end of welding machine and cathode output end, 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 the cathode output end of welding machine and cathode output end, 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, the short circuit current that produced by the pulse width modulating signal of described narrow spaces and coreless induction furnace is little and can not overshoot cathode output end and absorption surface moment.Short circuit current for safeguarding only may need the pulsewidth of 5%, 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%, avoid 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 in 5% this process the very large overshoot produced, cause during short circuit and glue rifle, be difficult to the problem of carrying out welding gun lifting.
S3: the cathode output end of detection welding machine whether with absorption surface, if cathode output end and absorption surface, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, set up electric arc;
Particularly, when whether cathode output end is with absorption surface, produce short circuit current between cathode output end and cathode output end, control unit sets up welding arc after receiving welding gun promotion signal between cathode output end and cathode output end.
S4: after the electric arc that ignites, operating voltage produces high-temperature electric arc and processes workpiece between positive pole and cathode output end, and durations ground output pulse width modulation signal is to the cathode output end of welding machine and cathode output end.
Particularly, when after striking success, described pulse width modulating signal continues to export, and the pulse width of described pulse width modulating signal is changing into the corresponding change of direct ratio with the output current of welding machine, and output current is larger, and pulse width is larger.
The control method of lifting striking sequential of the present invention, by being written with the single-chip microcomputer of programming language of above-mentioned steps S1-S4 as control, can simplifying control module, and be conducive to the miniaturization of control module.
The short circuit current pulse width modulating signal produced due to cathode output end and absorption surface moment produces, and the pulsewidth of described pulse width modulating signal is less than or equal to 10%, belongs to narrow spaces signal.Short circuit current for safeguarding only may need the pulsewidth of 5%, 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 not overshoot, effectively prevent output before welding and the problem of mutually clinging caused because of short circuit current overshoot between workpiece, contribute to the lifting of welding gun operating efficiency.In the present embodiment, the pulse width modulating signal of described narrow spaces efficiently avoid the problem of clinging between tungsten electrode and workpiece.Again due to after the electric arc that ignites, export the cathode output end of welding machine pulse width modulating signal durations to, that is to say that the little short circuit current in the generation utilizing the pulse width modulating signal of narrow spaces between cathode output end and cathode output end does the work of pilot arc.Because impulse amplitude is along with the proportional change of output current, therefore avoid the situation that pulse width is too small.Utilize the enough little condition of pulse width but be unlikely to too little condition, at cathode output end, when that is to say that welding gun leaves workpiece in short-term, holding circuit can not break, and it also avoid the problem of sticky rifle while pilot arc effectively.
Understandably, when short circuit current can detect obtain and can pilot arc, the cycle of pulse width modulating signal is shorter, and dutycycle is less, more effectively can 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, reduces 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 to the cathode output end of welding machine and cathode output end, the dutycycle of described pulse width modulating signal is less than or equal to 10%; Striking unit 20, at cathode output end and absorption surface, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, set up electric arc; Power main circuit 30, for after the electric arc that ignites, output services voltage produces high-temperature electric arc and processes workpiece between cathode output end and negative pole go out to hold.The control circuit 100 promoting striking sequential also comprises control unit 40, for detect welding machine cathode output end whether with absorption surface, if cathode output end and absorption surface, when producing short circuit current between cathode output end and cathode output end, receive short circuit current signal and trigger and to ignite electric arc at cathode output end.
The above embodiment only have expressed the specific embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not 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. promote a control method for striking sequential, it is characterized in that, comprise the following steps:
Be electrically connected cathode output end and the workpiece of welding machine;
Periodically output pulse width modulation signal is to the cathode output end of welding machine and cathode output end, and the dutycycle of described pulse width modulating signal is less than or equal to 10%;
The cathode output end of detection welding machine whether with absorption surface, if cathode output end and absorption surface, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, set up electric arc;
Ignite after electric arc, operating voltage produces high-temperature electric arc and processes workpiece between cathode output end and cathode output end, and durations ground output pulse width modulation signal is to the cathode output end of welding machine and cathode output end.
2. the control method promoting striking sequential as claimed in claim 1, it is characterized in that, when producing short circuit current between cathode output end and cathode output end, control unit sets up welding arc after receiving welding gun promotion signal between cathode output end and cathode output end.
3. the control method promoting striking sequential as claimed in claim 1, it is characterized in that, when after striking success, described pulse width modulating signal continues to export, and the pulse width of described pulse width modulating signal is changing into the corresponding change of direct ratio with the output current of welding machine.
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 to output pulse width modulation signal in 10 milliseconds of times to the cathode output end of welding machine and cathode output end in every 100 milliseconds.
5. promote a control circuit for striking sequential, it is characterized in that, comprising:
Pwm unit, for the ground of durations before and after the electric arc that ignites output pulse width modulation signal to the cathode output end of welding machine and cathode output end, the dutycycle of described pulse width modulating signal is less than or equal to 10%;
Striking unit, at cathode output end and absorption surface, pulse width modulating signal produces short circuit current between cathode output end and cathode output end, between cathode output end and cathode output end, set up electric arc;
Power main circuit, for after the electric arc that ignites, output services voltage produces high-temperature electric arc and processes workpiece between cathode output end and negative pole go out to hold.
6. the control circuit promoting striking sequential as claimed in claim 5, it is characterized in that, also comprise control unit, negative pole for detecting welding machine go out end whether with absorption surface, if cathode output end and absorption surface, when 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 to output pulse width modulation signal in 10 milliseconds of times to the cathode output end of welding machine and cathode output end 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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| Publication Number | Publication Date |
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| CN103658932A CN103658932A (en) | 2014-03-26 |
| CN103658932B true CN103658932B (en) | 2016-03-30 |
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| CN201310658862.9A Expired - Fee Related CN103658932B (en) | 2013-12-06 | 2013-12-06 | Promote control method and the control circuit of striking sequential |
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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 |
-
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 |
Non-Patent Citations (2)
| Title |
|---|
| 单片机控制IGBT逆变式脉冲TIG焊电源的研究;韩赞东;《电焊接》;19960605;第4页至第6页 * |
| 用80C196KC实现IGBT逆变脉冲TIG焊机的控制;廖国华;《矿业研究与开发》;20000430;第24页至第27页 * |
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| CN103658932A (en) | 2014-03-26 |
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Granted publication date: 20160330 |