CN110877137B - Arc striking control method and control system for inverter manual arc welding machine - Google Patents
Arc striking control method and control system for inverter manual arc welding machine Download PDFInfo
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- CN110877137B CN110877137B CN201911160621.5A CN201911160621A CN110877137B CN 110877137 B CN110877137 B CN 110877137B CN 201911160621 A CN201911160621 A CN 201911160621A CN 110877137 B CN110877137 B CN 110877137B
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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
- B23K9/0671—Starting the arc by means of brief contacts between the electrodes
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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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
- B23K9/093—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits the frequency of the pulses produced being modulatable
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Abstract
The invention relates to an arc striking control method and a control system of an inverter manual arc welding machine, wherein the method comprises the following steps: and providing a pulse hot arc striking signal to a given circuit of the power supply of the inverter manual arc welding machine, so that the welding current of the power supply of the inverter manual arc welding machine becomes pulse square wave arc striking current, and after the arc striking of the power supply of the inverter manual arc welding machine succeeds, turning off the pulse hot arc striking signal, recovering the normal welding current, normally burning the arc and finishing the arc striking. The invention is suitable for welding plates with different thicknesses, is particularly suitable for manual arc welding of thin plates, and has the characteristics of easy arc striking, high arc striking success rate, good welding forming, difficult deformation during welding and high welding strength.
Description
Technical Field
The invention relates to the field of inverter welding machines, in particular to an arc striking control method and an arc striking control system for an inverter manual arc welding machine.
Background
With the wide application of the inverter manual arc welding machine, the market competition is increasingly violent, and the performance and the cost become two important competitive factors; the power supply of the inverter manual arc welding machine is generally applied to the welding of medium and heavy plates, and is realized by adopting a method of swinging a welding rod in order to increase the strength.
The existing contravariant manual arc welding machine has the defects that the arc striking of the existing contravariant manual arc welding machine adopts the mode that the arc striking is adopted to superpose one thrust and one hot arc striking current at a time, but the workpiece is easy to weld when the current is too large; when the current is too small, arc striking cannot be performed; in a word, arc striking is not easy to succeed, and only a scheme of striking arcs for multiple times can be adopted, so that the current situation that labor is consumed and materials are wasted is caused.
Disclosure of Invention
The invention aims to provide an arc striking control method and an arc striking control system for an inverter manual arc welding machine, which solve the problem that the arc striking current (comprising hot arc striking, thrust and given) is not controlled accurately enough when the inverter manual arc welding machine strikes an arc on a welding sheet workpiece, and achieve the effect of accurately and finely controlling the arc striking of the inverter manual arc welding machine.
The technical purpose of the invention is realized by the following technical scheme:
an arc striking control method for an inverter manual arc welding machine is characterized in that a pulse hot arc striking signal is provided to a given circuit of a power supply of the inverter manual arc welding machine, so that the welding current of the power supply of the inverter manual arc welding machine becomes pulse square wave arc striking current, after the arc striking of the power supply of the inverter manual arc welding machine succeeds, the pulse hot arc striking signal is turned off, normal welding current is recovered, an arc burns normally, and arc striking is completed.
By adopting the technical scheme, the arc striking current (comprising hot arc striking, thrust and given) of the inverter manual arc welding machine during arc striking of the welding sheet workpiece is accurately controlled by utilizing the pulse hot arc striking signal.
The invention is further configured to: the pulse heat arc ignition signal is obtained by gradually changing N pulse signals at different set values of the thrust current and the welding current.
By adopting the technical scheme, the welding current of the power supply of the inverter manual arc welding machine becomes pulse square wave arc striking current.
The invention is further configured to: the frequency and the duty ratio of the pulse heat arc ignition signal are adjustable.
By adopting the technical scheme, the pulse thermal arc striking current signal can be controlled by adjusting the pulse combination of the pulse duty ratio and the pulse frequency, so that arc striking currents with different sizes required by thin and thick plates are achieved.
The second technical purpose of the invention is realized by the following technical scheme:
an arc starting control system for an inverter manual arc welder, comprising: the device comprises a voltage setting unit, a pulse heat arc striking unit, a welding machine voltage sampling unit, a welding machine current sampling unit, a one-way conduction unit, a switch unit, an operational amplification unit and a PWM control unit;
after a voltage given signal provided by the voltage given unit, a pulse hot arc striking signal provided by the pulse hot arc striking unit and a current negative feedback signal provided by the welding machine current sampling unit are superposed and summed, the pulse width of the PWM control unit is controlled by the operational amplification unit, so that when a welding rod contacts a workpiece, an electric arc can be generated between the workpiece and the welding rod, the welding machine voltage sampling unit obtains that the output voltage of the anode of the power supply of the inverter manual arc welding machine is fed back to the switch unit from high to low, the switch unit pulls down the level to turn off the pulse hot arc striking signal provided by the pulse hot arc striking unit, the electric arc is normally combusted, and arc striking is completed.
By adopting the technical scheme, the arc striking current (comprising hot arc striking, thrust and given) of the inverter manual arc welding machine during arc striking of the welding sheet workpiece is accurately controlled by utilizing the pulse hot arc striking signal.
The invention is further configured to: the pulse heat arc ignition unit comprises: the device comprises a sawtooth wave generating unit, a frequency adjusting unit, a duty ratio adjusting unit and a first comparator unit; the sawtooth wave generating unit is connected with the frequency adjusting unit, the frequency adjusting unit and the duty ratio adjusting unit are respectively connected with two input ends of the first comparator unit, and the output end of the first comparator unit is used as the output end of the pulse heat arc striking unit.
By adopting the technical scheme, the frequency and the duty ratio of the pulse thermal arc striking current signal can be controlled by the frequency adjusting unit and the duty ratio adjusting unit, so that arc striking currents with different sizes required by thin and thick plates can be obtained.
The invention is further configured to: the welder voltage sampling unit is arranged between the welder voltage sampling unit and the switch unit.
By adopting the technical scheme, the second comparator unit is used for setting the voltage threshold of the control shutoff pulse thermal arc ignition signal.
The invention is further configured to: the welding machine current sampling unit is arranged at the output end of the welding machine current sampling unit.
By adopting the technical scheme, the filtering unit is used for filtering the current signal acquired by the welding machine current sampling unit, so that the current negative feedback signal is clearer.
The invention is further configured to: the operational amplification unit comprises an operational amplifier U1B, a capacitor C1, a capacitor C2 and a resistor R3; the inverting input end of the operational amplifier U1B is connected to one end of the capacitor C1 and one end of the capacitor C2 and serves as the input end of the operational amplification unit, the other end of the capacitor C2 is connected to the resistor R3, the other end of the resistor R3 is connected to the other end of the capacitor C1 and the output end of the operational amplifier U1B and serves as the output end of the operational amplification unit, that is, the operational amplifier U1B, the capacitor C1, the capacitor C2 and the resistor R3 form a PI proportional regulator for controlling the pulse width of the PWM control unit.
By adopting the technical scheme, the operational amplifier U1B, the capacitor C1, the capacitor C2 and the resistor R3 form a PI proportional regulator for controlling the pulse width of the PWM control unit.
The invention is further configured to: the switching unit is a transistor Q1.
By adopting the technical scheme, when the base current of the triode becomes large, the collector and the emitter are switched on, and the voltage of the collector is reduced for switching off the pulse thermal arc-striking signal.
The invention is further configured to: the unidirectional conducting unit is a diode D1.
By adopting the technical scheme, the circuit is used for being matched with the switch unit to turn off the pulse heat arc ignition signal.
In conclusion, the invention has the following beneficial effects:
1. the verification proves that the arc striking effect is obviously improved, the method is suitable for welding plates with different thicknesses, is particularly suitable for manual arc welding of thin plates, and has the characteristics of easy arc striking, high arc striking success rate, good welding forming, difficult deformation in welding and high welding strength;
2. multiple experiments verify that a good arc striking effect of the thin plate is achieved, and the technical problem that arc striking is not easy to succeed or welding is easy to penetrate in the manual thin plate welding process in the industry is solved; the large technical breakthrough of the power supply of the inverter manual arc welding machine in the arc striking of the thin plate is realized;
3. in addition, the arc striking of the contravariant manual arc welding machine is controlled precisely and accurately by opening up a shortcut, the conception is unique and ingenious, the design is simple, and the actual application effect is obvious.
Drawings
FIG. 1 is a schematic diagram of a pulsed hot ignition signal welding current versus time of example 1;
FIG. 2 is a schematic block diagram of an arc ignition control system of the inverter manual arc welder of embodiment 2;
FIG. 3 is a schematic block diagram of an arc ignition control system of the inverter manual arc welder of embodiment 3;
FIG. 4 is a schematic diagram of an arc ignition control system of the inverter manual arc welding machine in the embodiment 7.
In the figure, 1, a voltage is given to a unit; 2. a pulse heat arc striking unit; 3. a welder voltage sampling unit; 4. a welding machine current sampling unit; 5. a one-way conduction unit; 6. a switch unit; 7. an operational amplification unit; 8. a PWM control unit; 9. a second comparator unit; 10. a filtering unit; 21. a sawtooth wave generating unit; 22. a frequency adjustment unit; 23. a duty ratio adjusting unit; 24. a first comparator unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: an arc striking control method for an inverter manual arc welding machine is characterized in that a pulse hot arc striking signal is provided to a given circuit of a power supply of the inverter manual arc welding machine, so that the welding current of the power supply of the inverter manual arc welding machine becomes pulse square wave arc striking current, after the arc striking of the power supply of the inverter manual arc welding machine succeeds, the pulse hot arc striking signal is turned off, normal welding current is recovered, an arc burns normally, and arc striking is completed.
The pulse hot arc-striking signal is used for accurately controlling the arc-striking current (including hot arc-striking, thrust and given) of the inverter manual arc welding machine during the arc striking of the welding sheet workpiece.
As shown in fig. 1, the pulse heat arc ignition signal is obtained by gradually changing N pulse signals at different set values of the thrust current and the welding current, wherein N is a positive integer.
Coordinate Y-axis: welding current, denoted by I; i ispPeak value of thrust current; i isSTWelding (given) current; coordinate X-axis: welding time, denoted by t; number of thrust current pulses N: represented by n between the coordinates X and Y.
Preferably, the frequency and the duty ratio of the pulse thermal arc ignition signal are adjustable; the pulse thermal arc striking current signal can be controlled by adjusting the pulse combination of the pulse duty ratio and the pulse frequency, so that arc striking currents with different sizes required by thin and thick plates are achieved.
Example 2: as shown in fig. 2, an arc ignition control system of an inverter manual arc welder comprises: the device comprises a voltage setting unit 1, a pulse thermal arc striking unit 2, a welding machine voltage sampling unit 3, a welding machine current sampling unit 4, a one-way conduction unit 5, a switch unit 6, an operational amplification unit 7 and a PWM control unit 8;
after a voltage given signal provided by the voltage given unit 1, a pulse hot arc ignition signal provided by the pulse hot arc ignition unit 2 and a current negative feedback signal provided by the welding machine current sampling unit 4 are superposed and summed, the pulse width of the PWM control unit 8 is controlled through the operation amplification unit 7, so that when a welding rod contacts a workpiece, an inverter manual arc welding machine power supply can rapidly generate an electric arc between the workpiece and the welding rod, at the moment, the welding machine voltage sampling unit 3 obtains that the output voltage of the anode of the inverter manual arc welding machine power supply rapidly changes from high to low and feeds the voltage back to the switch unit 6, the switch unit 6 pulls down the level and cooperates with the one-way conduction unit 5 to rapidly turn off the pulse hot arc ignition signal provided by the pulse hot arc ignition unit 2, the electric arc is normally combusted, and arc ignition is completed.
Example 3: as shown in fig. 3, the difference from embodiment 2 is that the pulse heat ignition unit 2 includes: a sawtooth wave generating unit 21, a frequency adjusting unit 22, a duty ratio adjusting unit 23, and a first comparator unit 24; the sawtooth wave generating unit 21 is connected with the frequency adjusting unit 22, the frequency adjusting unit 22 and the duty ratio adjusting unit 23 are respectively connected with two input ends of the first comparator unit 24, and an output end of the first comparator unit 24 is used as an output end of the pulse thermal arc striking unit 2.
The frequency and the duty ratio of the pulse hot arc striking current signal can be controlled by the frequency adjusting unit and the duty ratio adjusting unit, so that arc striking currents with different sizes required by thin and thick plates can be obtained.
Example 4: as shown in fig. 3, the difference from embodiment 2 is that a second comparator unit 9 is further included, and is disposed between the welder voltage sampling unit 3 and the switching unit 6. The second comparator unit is used for setting a voltage threshold value of the control shutdown pulse thermal arc ignition signal.
Example 5: as shown in fig. 3, the difference from embodiment 2 is that the welding machine current sampling unit further includes a filtering unit 10, which is disposed at the output end of the welding machine current sampling unit 4 and is used as a new output end of the welding machine current sampling unit 4, and is connected to the operational amplifying unit 7. The filtering unit is used for filtering the current signal acquired by the welding machine current sampling unit, so that the current negative feedback signal is clearer.
Example 6: as shown in fig. 4, the difference from embodiment 2 is that the operational amplification unit 7 includes an operational amplifier U1B, a capacitor C1, a capacitor C2, and a resistor R3; the forward input end of the operational amplifier U1B is grounded, the inverting input end of the operational amplifier U1B is connected to one end of the capacitor C1 and one end of the capacitor C2 and serves as the input end of the operational amplifier unit 7, the other end of the capacitor C2 is connected to the resistor R3, the other end of the resistor R3 is connected to the other end of the capacitor C1 and the output end of the operational amplifier U1B and serves as the output end of the operational amplifier unit 7, that is, the operational amplifier U1B, the capacitor C1, the capacitor C2 and the resistor R3 constitute a PI proportional regulator for controlling the pulse width of the PWM control unit.
Example 7: as shown in fig. 4, the voltage setting unit 1 is formed by a voltage dividing circuit, which is composed of a voltage VCC, a resistor R1 and an adjustable resistor VR1, and the voltage of the voltage dividing circuit can be adjusted from small to large. The sawtooth wave generating unit 21 and the frequency adjusting unit 22 are composed of a voltage VCC, a resistor R6, resistors R10 and 1/4 operational amplifier U1C, a resistor R4, a capacitor C3, a resistor R8, an adjustable resistor VR3 and a resistor R9. The duty ratio adjusting unit 23 is composed of a voltage VCC, a resistor R2, an adjustable resistor VR2, and a resistor R5. The first comparator unit 24 is composed of an 1/4 operational amplifier U1D and a resistor R7. The welder voltage sampling unit 3 and the second comparator unit 9 are composed of a resistor R11, a resistor R13, a resistor R12, a resistor R14 and a resistor 1/4 operational amplifier U1D, and the resistor R11 and the resistor R13 form a voltage dividing circuit for sampling the voltage of the welder; the resistor R12 and the resistor R14 are arranged at the inverting input end of the 1/4 operational amplifier U1D and are used for setting a threshold value for controlling the voltage of the turn-off pulse. The switch unit 6 is composed of a resistor R18 and a triode Q1; when the base current of the triode becomes large, the collector and the emitter are switched on, and the voltage of the collector is reduced for switching off the pulse thermal arc ignition signal. The unidirectional conducting unit 5 is composed of a diode D1; for cooperating with the switching unit 6 to switch off the pulsed thermal arc ignition signal. The welder current sampling unit 4 and the filtering unit 10 are composed of a resistor R16, a resistor R15 and a capacitor C4, and provide current negative feedback signals. The operational amplification unit 7 is composed of an 1/4 operational amplifier U1B, a capacitor C1, a capacitor C2 and a resistor R3 to form a PI proportional regulator which is used for controlling the pulse width of the PWM control unit.
After the voltage given signal provided by the voltage given unit 1, the pulse thermal arc ignition signal provided by the sawtooth wave generating unit 21, the frequency adjusting unit 22 and the duty ratio adjusting unit 23 and the current negative feedback signal provided by the welder current sampling unit 4 are superposed and summed, the pulse width of the PWM control unit 8 is controlled by the operational amplifying unit 7, so that when a welding rod contacts a workpiece, an arc can be rapidly generated between the workpiece and the welding rod by the power supply of the inverter manual arc welder, at the moment, a voltage division circuit consisting of a resistor R11 and a resistor R13 in the welder voltage sampling unit 3 obtains that the output voltage of the anode of the power supply of the inverter manual arc welder is rapidly changed from high to low and is fed back to a triode Q1 when the output voltage is lower than the threshold value of the set control turn-off pulse voltage, a triode Q1 is switched on, the collector of the triode Q1 is at a low level (about 0.4V), the low level is pulled and the pulse thermal arc ignition signal is rapidly turned off by matching with a diode D1, the voltage setting signal is normally supplied, the electric arc is normally burnt, and the arc striking is completed.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the present invention.
Claims (9)
1. An arc striking control method of an inverter manual arc welding machine is characterized by comprising the following steps: providing a pulse hot arc ignition signal to a given circuit of an inverter manual arc welding machine power supply, enabling the welding current of the inverter manual arc welding machine power supply to become pulse square wave arc ignition current, and after the inverter manual arc welding machine power supply successfully ignites an arc, turning off the pulse hot arc ignition signal, recovering the normal welding current, normally burning the arc, and completing arc ignition; the pulse heat arc ignition signal is obtained by gradually changing N pulse signals at different set values of the thrust current and the welding current.
2. The arc ignition control method of the inverter manual arc welder as claimed in claim 1, which is characterized in that: the frequency and the duty ratio of the pulse heat arc ignition signal are adjustable.
3. The utility model provides an arc control system is fired to contravariant manual arc welding machine, characterized by includes: the device comprises a voltage setting unit (1), a pulse thermal arc striking unit (2), a welding machine voltage sampling unit (3), a welding machine current sampling unit (4), a one-way conduction unit (5), a switch unit (6), an operational amplification unit (7) and a PWM control unit (8);
after a voltage given signal provided by the voltage given unit (1), a pulse hot arc ignition signal provided by the pulse hot arc ignition unit (2) and a current negative feedback signal provided by the welding machine current sampling unit (4) are superposed and summed, the pulse width of the PWM control unit (8) is controlled through the operational amplification unit (7), so that when a welding rod of an inverter manual arc welding machine power supply contacts a workpiece, an electric arc can be generated between the workpiece and the welding rod, at the moment, the welding machine voltage sampling unit (3) acquires that the output voltage of the anode of the inverter manual arc welding machine power supply is from high to low and feeds back to the switch unit (6), the switch unit (6) pulls down the level to turn off the pulse hot arc ignition signal provided by the pulse hot arc ignition unit (2), the electric arc is normally combusted, and arc ignition is completed.
4. The arc ignition control system of the inverter manual arc welder as claimed in claim 3, characterized in that the pulse hot arc ignition unit (2) comprises: a sawtooth wave generating unit (21), a frequency adjusting unit (22), a duty ratio adjusting unit (23) and a first comparator unit (24); the sawtooth wave generating unit (21) is connected with the frequency adjusting unit (22), the frequency adjusting unit (22) and the duty ratio adjusting unit (23) are respectively connected with two input ends of the first comparator unit (24), and the output end of the first comparator unit (24) serves as the output end of the pulse heat arc striking unit (2).
5. The arc ignition control system of the inverter manual arc welder as claimed in claim 4, wherein: the welder voltage sampling device further comprises a second comparator unit (9) arranged between the welder voltage sampling unit (3) and the switch unit (6).
6. The arc ignition control system of the inverter manual arc welder as claimed in claim 4, wherein: the device also comprises a filtering unit (10) which is arranged at the output end of the welding machine current sampling unit (4).
7. The arc ignition control system of the inverter manual arc welder as claimed in claim 4, wherein: the operational amplification unit (7) comprises an operational amplifier U1B, a capacitor C1, a capacitor C2 and a resistor R3; the inverting input end of the operational amplifier U1B is connected with one end of the capacitor C1 and one end of the capacitor C2 and serves as the input end of the operational amplification unit (7), the other end of the capacitor C2 is connected with the resistor R3, the other end of the resistor R3 is connected with the other end of the capacitor C1 and the output end of the operational amplifier U1B and serves as the output end of the operational amplification unit (7), namely, the operational amplifier U1B, the capacitor C1, the capacitor C2 and the resistor R3 form a PI proportional regulator for controlling the pulse width of the PWM control unit.
8. The arc ignition control system of the inverter manual arc welder as claimed in claim 4, wherein: the switching unit (6) is a transistor Q1.
9. The arc ignition control system of the inverter manual arc welder as claimed in claim 4, wherein: the unidirectional conducting unit (5) is a diode D1.
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| CN201911160621.5A CN110877137B (en) | 2019-11-23 | 2019-11-23 | Arc striking control method and control system for inverter manual arc welding machine |
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| CN110877137A (en) | 2020-03-13 |
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