CN107214402A - The molten drop control circuit and method of a kind of short circuiting transfer - Google Patents
The molten drop control circuit and method of a kind of short circuiting transfer Download PDFInfo
- Publication number
- CN107214402A CN107214402A CN201710475574.8A CN201710475574A CN107214402A CN 107214402 A CN107214402 A CN 107214402A CN 201710475574 A CN201710475574 A CN 201710475574A CN 107214402 A CN107214402 A CN 107214402A
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- Prior art keywords
- welding
- circuit
- transition resistance
- necking down
- molten drop
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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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Abstract
Circuit is controlled the invention discloses a kind of molten drop of short circuiting transfer, including welding circuit, the on-off switch of control welding circuit loop break-make when welding circuit is included in necking down, a transition resistance is parallel with the on-off switch, it utilizes transition resistance decay welding circuit electric current, it is greatly reduced electric current during necking down, realize that molten drop comes off, due to the access of transition resistance in whole loop, it is not in the situation that electric width is broken, and transition resistance can absorb the energy that reactor is stored in loop, energy is endlessly sent into welding region by transition resistance, energy is not wasted, not only contribute to welding machine and export larger energy, improve welding efficiency.
Description
Technical field
The present invention relates to welding field, and in particular to the molten drop control circuit and method of a kind of short circuiting transfer.
Background technology
CO2Gas shielded welding, because liquid metal is in Fe+, CO, O-, C+ and a small amount of CO2In the atmosphere of plasma,
Surface-active is poor, " air cushion " effect that the localized hyperthermia and cation Fe+ for causing anode spot largely overflow, so as to cause to melt
Drop is not easy to come off naturally from welding wire end, before welding current is less than some critical value, and short circuit is presented in the transition of molten drop
The feature of transition.The liquid surface of welding wire end has local electric conduction phenomena, referred to as anode spot.The control of short-circuit process, its is heavy
Will mark be necking down control, molten drop is completed from " the coming off " of welding wire end sections.
In order to control to splash, Lincoln's electrical equipment employs STT technologies, carries out the detection and control of necking down, and its principle is to utilize
Darlington transistor controls output current, by current control is low current in constriction moment, its main circuit is characterized in using reaching
Islington pipe limits the electric current in inductance L as switch, so as to reach the effect of control electric current, the electric current during necking down is by master
The current attenuation of circuit completes nature transition, and Darlington transistor is forced shutdown.
The method of another necking down control is appeared on Panasonic welding machine CS4.Wherein, necking down control uses IGBT, works in
On off state, after necking down signal is detected, turns off IGBT, electric current is reduced rapidly, unnecessary energy formed on inductance compared with
Big voltage, is absorbed its voltage peak using absorbing circuit, in order to avoid damage IGBT.
The control method of above droplet transfer is to use switching device, and its circuit theory diagrams can be looked in available data
Arrive, at the time of necking down is formed, break major loop, reach the purpose that electric current reduces rapidly, its common foundation is：
Va=L × δ ∣ a,
Wherein, Va is necking down moment arc voltage, Va ≈ 0V；L is the inductance value in loop, is a fixed value, generally 50 μ H；
δ ∣ a are the current change quantity in loop.
Can reasoning, as Va=0V, , δ ∣ a are also inevitable close to 0, and electric current is constant, in order to control the electric current during necking down, makes
Electric current reduces at once when producing necking down, it is desirable to have larger δ ∣ a, the method that two above scheme employs " being forced shutdown ", and
Using overpressure absorbing circuit, the high pressure coupled during being forced shutdown is absorbed with RC, and in control process, which reduces back
The energy on road, is unfavorable for welding machine and exports larger energy, does not help improving welding efficiency.
The content of the invention
In order to solve the above-mentioned technical problem the present invention provides the molten drop control circuit and method of a kind of short circuiting transfer.
The present invention is achieved through the following technical solutions：
A kind of molten drop control circuit of short circuiting transfer, including welding circuit, control welding when welding circuit is included in necking down
A transition resistance is parallel with the on-off switch of loop break-make, the on-off switch.Existing welding circuit utilizes on-off switch
Welding circuit is controlled, in necking down, loop current is reduced to 0 by the break-make of control loop by force, so as to realize that molten drop takes off
Fall.But, cutoff circuit makes electric current be reduced to 0 not only easily to break electric arc by force, and upon opening, the energy stored on inductance
It cannot consume.This programme is on on-off switch before a transition resistance in parallel, molten drop necking down, and transition resistance is similar to and is shorted；
After molten drop necking down, on-off switch is disconnected, and transition resistance is accessed into loop, the purpose of reduction loop current is reached, so as to realize molten
Drop comes off.After transition resistance accesses loop, the energy that reactor is stored in loop is changed into heat and absorbed by transition resistance, transition
Energy is endlessly sent into welding region by resistance, and energy is not wasted, and is not only contributed to welding machine and is exported larger energy, carries
High welding efficiency, and be not in the situation that electric arc is broken due to the access of transition resistance.
Preferably, transition resistance is welding wire, the welding wire of wire-feed motor is directly accessed to welding circuit as transition resistance, its
Material is easy to get, and make it that circuit is more succinct.
A kind of molten drop control method of short circuiting transfer, comprises the following steps,
A transition resistance in parallel on the on-off switch of welding circuit；
Dissolved drip necking down state is monitored, when necking down, disconnecting on-off switch makes transition resistance access welding circuit.
This method transition resistance in parallel on on-off switch, during necking down, disconnects on-off switch, makes transition resistance access weldering
Road is taken back, i.e., the electric current for the welding circuit that decays using electric-resistivity method.Realize that molten drop comes off.
Preferably, the transition resistance is welding wire.
The present invention compared with prior art, has the following advantages and advantages：
1st, methods and apparatus of the present invention transition resistance in parallel on the on-off switch of welding circuit, on-off switch disconnects
When, transition resistance access welding circuit, using transition resistance decay welding circuit electric current, is greatly reduced electric current during necking down, real
Existing molten drop comes off, due to the access of transition resistance in whole loop, is not in the situation that electric arc is broken, and transition resistance can be inhaled
The energy that reactor is stored in road is withdrawn, energy is endlessly sent into welding region by transition resistance, and energy is not wasted, no
Only be conducive to welding machine to export larger energy, improve welding efficiency.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is circuit theory diagrams of the invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make
For limitation of the invention.
Embodiment 1
A kind of molten drop control method of short circuiting transfer, comprises the following steps,
A transition resistance in parallel on the on-off switch of welding circuit；
Necking down state is monitored, when necking down, disconnecting on-off switch makes transition resistance access welding circuit.
The monitoring determination methods of necking down state are prior art, and this method is realized by the monitoring of necking down state and break-make is opened
The control of pass.This method by accessing resistance so as to realize current attenuation in the loop.
Embodiment 2
Based on the principle of embodiment 1, the present embodiment discloses the particular circuit configurations based on the method for embodiment 1.A kind of short circuit
The molten drop control circuit of transition, including welding circuit, control welding circuit on/off when the welding circuit is included in necking down
On-off switch, be parallel with a transition resistance on the on-off switch.Welding circuit as shown in Figure 1 is whole including what is be sequentially connected
Current circuit, outputting inductance L1, on-off switch S1, ignition tip；Rectification circuit, outputting inductance L1, on-off switch S1, ignition tip pass through
Welding workpiece and bottom line constitute welding circuit.R1 is the equivalent resistance of cable in figure.The output of rectification circuit is through outputting inductance
After L1 filtering, DC current is exported.Transition resistance can directly on on-off switch S1 a resistance in parallel, the resistance heating power
It is sufficiently large, is unlikely to fusing；And the sufficiently large purpose to reach rapid reduction electric current of resistance, i.e., need under normal circumstances by
Electric current in inductance is rapidly decreased to below 80A.Depending on its resistance is according to the inductance value used, general outputting inductance L1 is 50
μ H, in requisition for resistance value be greater than 200 milliohms.And welding wire can meet above-mentioned requirements well, directly by the weldering of wire-feed motor
Silk is accessed in welding circuit as transition resistance, now, and peripheral wire-feed motor has two parts, one to the control for welding circuital current
Part carries out break-make control by on-off switch S1, when detecting necking down signal, turns off S1；Another part passes through R2 and original master
Loop forms loop, and circuit model of the loop when necking down is produced is changed to：
Va=L × δ ∣ a+Ia*R2.
Before necking down, Va is close to 14V, because transition resistance is shorted, it is believed that：Va=L × δ ∣ a, i.e. L × δ ∣ a=
14V, now, electric current are gradually increasing.
Necking down transient voltage is changed into 0V, and due to R2 accesses, expression formula is changed into：- L × δ ∣ a=Ia*R2 ≈ 14V.Outputting inductance
The electric energy of L1 storages is changed into 14V back-pressures, and real arc voltage is changed into 0V from 14V.
The material of standard welding wire is H08Mn2Si, and length is 3.5M, and it is R Φ 1.6=0.6 Ω, R Φ 1.2 that it, which surveys resistance,
=0.6 × 1.77=1 Ω, R Φ 1.0=1.4 Ω.Welding circuit, transition electricity are accessed using the welding wire of wire-feed motor as transition resistance
After resistance access welding circuit, electric current Ia value is changed into 14V/R2, i.e. Ia (Φ 1.6)=23A, Ia (Φ from Short-Circuit High Current immediately
1.2)=13A, Ia (Φ 1.0)=9A, now, electric current Ia is far smaller than electric current needed for necking down.
Transition resistance R2 is that welding wire is accessed behind loop, and the energy that reactor is stored in loop is changed into heat and absorbed by welding wire,
Energy is endlessly sent into welding region by welding wire, and energy is not wasted, and is not only contributed to welding machine and is exported larger energy, carries
High welding efficiency, and be not in the situation that electric width is broken due to the access of transition resistance.Can be according to the temperature control of welding wire
Low current duration is the time that on-off switch S1 disconnects during necking down, in order to avoid the too high influence wire feed of welding wire temperature.Using
The circuit structure, does not increase especially complex design, it is easy to accomplish commercialization；Can be according to the species of welding wire, appropriate regulation is opened
The road time, to reach the balance of heat and temperature.
In figure, T1 is contact pair, the connection terminal for connecting source of welding current positive pole and welding wire distal end, and the near-end of welding wire connects
Be connected on ignition tip, contact contains R2 to being connected when principal current shut-off is with control necking down in loop, about hundreds of milliohms it is interior
Resistance.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (4)
1. a kind of molten drop control circuit of short circuiting transfer, including welding circuit, control weldering when the welding circuit is included in necking down
Take back the on-off switch of road disconnection, it is characterised in that a transition resistance is parallel with the on-off switch.
2. the molten drop control circuit of a kind of short circuiting transfer according to claim 1, it is characterised in that the transition resistance is
Welding wire.
3. the molten drop control method of a kind of short circuiting transfer, it is characterised in that comprise the following steps,
A transition resistance in parallel on the on-off switch of welding circuit；
Necking down state is monitored, when necking down, disconnecting on-off switch makes transition resistance access welding circuit.
4. a kind of molten drop control method of short circuiting transfer according to claim 3, it is characterised in that the transition resistance is
Welding wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710475574.8A CN107214402A (en) | 2017-06-21 | 2017-06-21 | The molten drop control circuit and method of a kind of short circuiting transfer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710475574.8A CN107214402A (en) | 2017-06-21 | 2017-06-21 | The molten drop control circuit and method of a kind of short circuiting transfer |
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| Publication Number | Publication Date |
|---|---|
| CN107214402A true CN107214402A (en) | 2017-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710475574.8A Pending CN107214402A (en) | 2017-06-21 | 2017-06-21 | The molten drop control circuit and method of a kind of short circuiting transfer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365965A (en) * | 2018-11-23 | 2019-02-22 | 哈尔滨工程大学 | The Welding Molten Drop interim process control equipment and control method coordinated based on the double tungsten electrodes of superaudio pulse |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1565157A1 (en) * | 1964-08-10 | 1970-02-05 | Union Carbide Corp | Method and device for arc welding |
| US4544826A (en) * | 1983-05-04 | 1985-10-01 | Kabushiki Kaisha Kobe Seiko Sho | Method and device for controlling welding power supply to avoid spattering of the weld material |
| US4546234A (en) * | 1983-08-11 | 1985-10-08 | Kabushiki Kaisha Kobe Seiko Sho | Output control of short circuit welding power source |
| CN1033448A (en) * | 1986-12-11 | 1989-06-21 | 林肯电学公司 | The method and apparatus of control short-circuit welding system |
-
2017
- 2017-06-21 CN CN201710475574.8A patent/CN107214402A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1565157A1 (en) * | 1964-08-10 | 1970-02-05 | Union Carbide Corp | Method and device for arc welding |
| US4544826A (en) * | 1983-05-04 | 1985-10-01 | Kabushiki Kaisha Kobe Seiko Sho | Method and device for controlling welding power supply to avoid spattering of the weld material |
| US4546234A (en) * | 1983-08-11 | 1985-10-08 | Kabushiki Kaisha Kobe Seiko Sho | Output control of short circuit welding power source |
| CN1033448A (en) * | 1986-12-11 | 1989-06-21 | 林肯电学公司 | The method and apparatus of control short-circuit welding system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365965A (en) * | 2018-11-23 | 2019-02-22 | 哈尔滨工程大学 | The Welding Molten Drop interim process control equipment and control method coordinated based on the double tungsten electrodes of superaudio pulse |
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Application publication date: 20170929 |