CN104400185A - Striking arc detection and push current control circuit of electric arc welding equipment - Google Patents
Striking arc detection and push current control circuit of electric arc welding equipment Download PDFInfo
- Publication number
- CN104400185A CN104400185A CN201410588394.7A CN201410588394A CN104400185A CN 104400185 A CN104400185 A CN 104400185A CN 201410588394 A CN201410588394 A CN 201410588394A CN 104400185 A CN104400185 A CN 104400185A
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- voltage
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- welding
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Classifications
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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
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
-
- 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
-
- 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
- B23K9/095—Monitoring or automatic control of welding parameters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Abstract
The invention provides a striking arc detection and push current control circuit of electric arc welding equipment. The voltage of a node TP1 is set as push threshold point voltage and the voltage of a node TP3 is set as a welding rod and workpiece short-circuit threshold voltage. Voltages at the nodes TP2, TP1 and TP3 are compared by an operational amplifier; the voltage at the TP2 is false no-load voltage when a welding machine is in an idle state, and is actual voltage when the welding machine in no-load and load states. When the voltage of the TP2 is lower than the voltage of the TP3, high level is output to an interrupt pin of a single-chip microprocessor by a threshold monitoring pin, the single-chip microprocessor considers that the welding rod is short-circuited with the workpiece, and actual welding voltage is output to realize timely and reliable arc striking. During actual welding, when the voltage of the TP2 is lower than the voltage of the TP1, square wave set output by the single-chip microprocessor is subjected to optical coupling and RC (Resistance-Capacitance) filtering to obtain push set, and the push set is superimposed on output set to realize accurate push current. According to the circuit, welding output voltage is monitored in real time and an accurate voltage signal is given by using an eight-bit AVR single-chip microprocessor, so that the welding machine can realize reliable arc striking and provide accurate push current.
Description
Technical field
the present invention relates to a kind of SMAW striking detection and push current control circuit, belong to electric arc welding apparatus field.
background technology
the success or not that conventional welding rod weldering detects striking mainly relies on the electric current in monitoring welding circuit, but actual conditions are the method there is the phenomenon of signal lag, the experience of welder be exactly striking not in time with unreliable.
the push current of conventional welding rod weldering is coarse, and the uniformity of welding machine is not high, and when running into meticulous welding, welder can only be relied on to go constantly to carry out welding the performance that every platform welding machine is found out in test, and this work expends time in and energy.
summary of the invention
the object of the invention is to overcome the deficiencies in the prior art, a kind of striking detection and push current control circuit of electric arc welding equipment is provided, promote SMAW striking and thrust performance.
according to technical scheme provided by the invention, the striking detection of described electric arc welding equipment and push current control circuit, its structure comprises: welding machine output voltage is input to the input of voltage follower U1B by voltage isolator part isolated buck, voltage follower U1B output is connected to node TP2, and node TP2 connects the inverting input of amplifier U1A and the inverting input of amplifier U2A; The in-phase input end connected node TP1 of amplifier U1A, node TP1 connect high level and through resistance R6 ground connection, the voltage of node TP1 is threshold thrust force point voltage through resistance R5; The output of amplifier U1A connects the input anode of optocoupler U1 through resistance R3, the input negative terminal of optocoupler U1 connects triode Q1 colelctor electrode, and triode Q1 base stage connects the square wave given side of single-chip microcomputer through resistance R4, triode Q1 grounded emitter; The output plus terminal of optocoupler U1 connects high level, and the output negative terminal of optocoupler U1 through electric capacity C1 ground connection, and through resistance R2 thrust output Setting signal, namely obtains push current on the output that is added to is given; The in-phase input end connected node TP3 of amplifier U2A, node TP3 connect high level and through resistance R9 ground connection, the voltage of node TP3 is welding rod and workpiece short-circuit threshold value voltage through resistance R8; The output of amplifier U2A is through resistance R7 ground connection and be connected to the interrupt pin of single-chip microcomputer as threshold monitor pin; Node TP2 also connects the AD mouth of single-chip microcomputer through resistance R10, this AD mouth is also respectively through resistance R11 and electric capacity C2 ground connection; When node TP2 voltage is lower than TP3, threshold monitor pin exports the interrupt pin of high level to single-chip microcomputer, and single-chip microcomputer judges welding rod and workpiece short circuit, and exports actual welding voltage; During actual welding, when the voltage of monitoring node TP2 voltage lower than TP1, amplifier U1A exports high level, single-chip microcomputer output duty cycle can the square wave of fine adjustment, namely optocoupler exports identical square wave, and the RC filter structure consisted of resistance R2 and electric capacity C1 obtains the thrust Setting signal of smooth out ripple.Described single-chip microcomputer specifically can adopt 8 AVR single chip.
the voltage at node TP2 place is false floating voltage under welding machine idle condition, is provided by welding machine control circuit; Be virtual voltage under zero load and load condition, provided by main circuit of the welding machine.
advantage of the present invention is: utilize 8 AVR single chip Real-Time Monitorings welding output voltages and provide accurate voltage signal and make welding machine can striking reliably and provide accurate push current, and reliably, uniformity is high for this simple circuit.
accompanying drawing explanation
fig. 1 is circuit theory diagrams of the present invention.
detailed description of the invention
below in conjunction with drawings and Examples, the invention will be further described.
as shown in Figure 1, welding machine output voltage is input to the input of voltage follower U1B by voltage isolator part isolated buck, voltage follower U1B output is connected to node TP2, and node TP2 connects the inverting input of amplifier U1A and the inverting input of amplifier U2A; The in-phase input end connected node TP1 of amplifier U1A, node TP1 connect high level and through resistance R6 ground connection, the voltage of node TP1 is threshold thrust force point voltage through resistance R5; The output of amplifier U1A connects the input anode of optocoupler U1 through resistance R3, the input negative terminal of optocoupler U1 connects triode Q1 colelctor electrode, and triode Q1 base stage connects the square wave given side of single-chip microcomputer through resistance R4, triode Q1 grounded emitter; The output plus terminal of optocoupler U1 connects high level, and the output negative terminal of optocoupler U1 through electric capacity C1 ground connection, and through resistance R2 thrust output Setting signal, namely obtains push current on the output that is added to is given; The in-phase input end connected node TP3 of amplifier U2A, node TP3 connect high level and through resistance R9 ground connection, the voltage of node TP3 is welding rod and workpiece short-circuit threshold value voltage through resistance R8; The output of amplifier U2A is through resistance R7 ground connection and be connected to the interrupt pin of single-chip microcomputer as threshold monitor pin.Node TP2 also connects the AD mouth of single-chip microcomputer through resistance R10, this AD mouth is also respectively through resistance R11 and electric capacity C2 ground connection.
wherein, TP1 place is threshold thrust force point voltage; TP3 place is welding rod and workpiece short-circuit threshold value voltage.Voltage follower U1B is made up of amplifier.U1B and U1A is the double operational on chip LM358H.Welding machine output voltage is input to 5 pin of U1B by voltage isolator part isolated buck, node TP2 is outputted to again by voltage follower U1B, node TP2 and TP1, the voltage at TP3 point place is made comparisons use, the voltage at TP2 place is false floating voltage (welding machine output voltage is provided by control circuit, and non-main circuit provides, and IGBT does not work) under welding machine idle condition, under zero load and load condition be virtual voltage (main circuit provides, and IGBT works).
when welding rod and workpiece short circuit, we it has been generally acknowledged that now voltage should close to 0V, can by whether detecting output voltage close to the signal of 0V as short circuit, but actual conditions be this way or can cause striking not in time with unreliable, because the relation of the time difference, when circuit thinks short circuit, welding rod has been run into workpiece already in fact, for eliminating this error, we are using 40V(node TP3 by experiment) as threshold voltage, when the false zero load of circuit monitoring is less than 40V(TP2 point voltage lower than TP3) time, threshold monitor pin exports the interrupt pin of high level to AVR single chip, AVR single chip just thinks welding rod and workpiece short circuit, and export actual welding voltage, realize timely and reliable striking.
during actual welding, when the voltage of the voltage of monitoring welding rod and workpiece lower than TP1,1 pin of U1A exports high level, dutycycle that what AVR single chip exported is can the square wave of fine adjustment given, optocoupler and exportable identical square wave, the thrust that the RC filtering consisted of R2 and C1 obtains smooth out ripple is given, can realize accurate push current on the output that is added to is given.
Claims (3)
1. the striking detection of electric arc welding equipment and push current control circuit, it is characterized in that, comprise: welding machine output voltage is input to the input of voltage follower U1B by voltage isolator part isolated buck, voltage follower U1B output is connected to node TP2, and node TP2 connects the inverting input of amplifier U1A and the inverting input of amplifier U2A; The in-phase input end connected node TP1 of amplifier U1A, node TP1 connect high level and through resistance R6 ground connection, the voltage of node TP1 is threshold thrust force point voltage through resistance R5; The output of amplifier U1A connects the input anode of optocoupler U1 through resistance R3, the input negative terminal of optocoupler U1 connects triode Q1 colelctor electrode, and triode Q1 base stage connects the square wave given side of single-chip microcomputer through resistance R4, triode Q1 grounded emitter; The output plus terminal of optocoupler U1 connects high level, and the output negative terminal of optocoupler U1 through electric capacity C1 ground connection, and through resistance R2 thrust output Setting signal, namely obtains push current on the output that is added to is given; The in-phase input end connected node TP3 of amplifier U2A, node TP3 connect high level and through resistance R9 ground connection, the voltage of node TP3 is welding rod and workpiece short-circuit threshold value voltage through resistance R8; The output of amplifier U2A is through resistance R7 ground connection and be connected to the interrupt pin of single-chip microcomputer as threshold monitor pin; Node TP2 also connects the AD mouth of single-chip microcomputer through resistance R10, this AD mouth is also respectively through resistance R11 and electric capacity C2 ground connection; When node TP2 voltage is lower than TP3, threshold monitor pin exports the interrupt pin of high level to single-chip microcomputer, and single-chip microcomputer judges welding rod and workpiece short circuit, and exports actual welding voltage; During actual welding, when the voltage of monitoring node TP2 voltage lower than TP1, amplifier U1A exports high level, single-chip microcomputer output duty cycle can the square wave of fine adjustment, namely optocoupler exports identical square wave, and the RC filter structure consisted of resistance R2 and electric capacity C1 obtains the thrust Setting signal of smooth out ripple.
2. the striking detection of electric arc welding equipment and push current control circuit as claimed in claim 1, it is characterized in that, the voltage at described node TP2 place is false floating voltage under welding machine idle condition, is provided by welding machine control circuit; Be virtual voltage under zero load and load condition, provided by main circuit of the welding machine.
3. the striking detection of electric arc welding equipment and push current control circuit as claimed in claim 1, it is characterized in that, described single-chip microcomputer is 8 AVR single chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410588394.7A CN104400185B (en) | 2014-10-28 | 2014-10-28 | The striking detection of electric arc welding equipment and push current control circuit |
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| CN201410588394.7A CN104400185B (en) | 2014-10-28 | 2014-10-28 | The striking detection of electric arc welding equipment and push current control circuit |
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| CN104400185A true CN104400185A (en) | 2015-03-11 |
| CN104400185B CN104400185B (en) | 2016-05-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105665883A (en) * | 2016-01-12 | 2016-06-15 | 南通富力机电设备有限责任公司 | Automatic ball grinding control device and method based on single chip microcomputer and used for alternate current argon arc welding tungsten electrode |
| CN110064815A (en) * | 2019-05-28 | 2019-07-30 | 江苏航运职业技术学院 | A kind of arc initiation device and striking method of argon arc welding machine |
| CN111030646A (en) * | 2019-12-30 | 2020-04-17 | 桂林理工大学 | Cathode heating square wave generator synchronous adjusting device of electron beam welding machine |
Citations (7)
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|---|---|---|---|---|
| US3934110A (en) * | 1974-03-11 | 1976-01-20 | Denis Albert P | Welding system and method for arc starting and control |
| JPS5978781A (en) * | 1982-10-27 | 1984-05-07 | Fanuc Ltd | Welding method in automatic welding machine |
| DE3731180A1 (en) * | 1987-09-17 | 1989-03-30 | Utp Schweissmaterial | Method and device for splash-free ignition of a welding arc during partially mechanical or completely mechanical welding using a consumable electrode |
| CN103143812A (en) * | 2013-02-28 | 2013-06-12 | 广州市长胜焊接设备实业有限公司 | Automatic thrust and arc striking system for digital inversion arc welder |
| JP2013132658A (en) * | 2011-12-27 | 2013-07-08 | Daihen Corp | Method of controlling arc start of consumable electrode arc welding |
| CN103737153A (en) * | 2014-01-08 | 2014-04-23 | 无锡汉神电气有限公司 | High-frequency arc-striking circuit |
| CN204430525U (en) * | 2014-10-28 | 2015-07-01 | 无锡汉神电气有限公司 | The striking detection of electric arc welding equipment and push current control circuit |
-
2014
- 2014-10-28 CN CN201410588394.7A patent/CN104400185B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3934110A (en) * | 1974-03-11 | 1976-01-20 | Denis Albert P | Welding system and method for arc starting and control |
| JPS5978781A (en) * | 1982-10-27 | 1984-05-07 | Fanuc Ltd | Welding method in automatic welding machine |
| DE3731180A1 (en) * | 1987-09-17 | 1989-03-30 | Utp Schweissmaterial | Method and device for splash-free ignition of a welding arc during partially mechanical or completely mechanical welding using a consumable electrode |
| JP2013132658A (en) * | 2011-12-27 | 2013-07-08 | Daihen Corp | Method of controlling arc start of consumable electrode arc welding |
| CN103143812A (en) * | 2013-02-28 | 2013-06-12 | 广州市长胜焊接设备实业有限公司 | Automatic thrust and arc striking system for digital inversion arc welder |
| CN103737153A (en) * | 2014-01-08 | 2014-04-23 | 无锡汉神电气有限公司 | High-frequency arc-striking circuit |
| CN204430525U (en) * | 2014-10-28 | 2015-07-01 | 无锡汉神电气有限公司 | The striking detection of electric arc welding equipment and push current control circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105665883A (en) * | 2016-01-12 | 2016-06-15 | 南通富力机电设备有限责任公司 | Automatic ball grinding control device and method based on single chip microcomputer and used for alternate current argon arc welding tungsten electrode |
| CN110064815A (en) * | 2019-05-28 | 2019-07-30 | 江苏航运职业技术学院 | A kind of arc initiation device and striking method of argon arc welding machine |
| CN110064815B (en) * | 2019-05-28 | 2021-06-29 | 江苏航运职业技术学院 | Arc striking device and arc striking method of argon arc welding machine |
| CN111030646A (en) * | 2019-12-30 | 2020-04-17 | 桂林理工大学 | Cathode heating square wave generator synchronous adjusting device of electron beam welding machine |
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| Publication number | Publication date |
|---|---|
| CN104400185B (en) | 2016-05-04 |
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Address after: 214101 Jiangsu city of Wuxi Province east of Xishan Furong District of Xishan Economic Development Zone, Road No. 100 Patentee after: Wuxi Han God Electric Limited by Share Ltd Address before: 214101 Jiangsu city of Wuxi Province east of Xishan Furong District of Xishan Economic Development Zone, Road No. 100 Patentee before: Wuxi Hanshen Electric Co., Ltd. |