CN211331733U - Submerged arc welding molten pool energy compensation circuit - Google Patents
Submerged arc welding molten pool energy compensation circuit Download PDFInfo
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- CN211331733U CN211331733U CN201922153359.3U CN201922153359U CN211331733U CN 211331733 U CN211331733 U CN 211331733U CN 201922153359 U CN201922153359 U CN 201922153359U CN 211331733 U CN211331733 U CN 211331733U
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Abstract
The utility model discloses a submerged arc welding molten bath energy compensating circuit, current feedback and voltage feedback have simultaneously, and the voltage arithmetic element who has voltage feedback and current feedback simultaneously, the first operation result voltage signal of current arithmetic element output does not directly enter into welding machine power unit, but gets into voltage arithmetic element, voltage arithmetic element carries out differential or proportion differential operation with the voltage sampling signal of first operation result voltage signal with the feedback, output second operation result voltage signal controls welding machine power unit again. The submerged arc welding molten pool energy compensation circuit can ensure that the submerged arc welding machine can keep the output constant current characteristic when the welding voltage is stable, can respond to the voltage change speed in real time to adjust the welding current when the welding voltage changes, shows better arc energy compensation characteristic when the welding voltage changes violently, has relatively wider voltage adjustment range, and can compensate the arc energy when the welding voltage is set to be lower.
Description
Technical Field
The utility model relates to a submerged arc welding machine, in particular to submerged arc welding molten bath energy compensation circuit.
Background
Submerged arc welding (including submerged arc welding, electroslag welding, and the like) is a method in which an electric arc is burned under a flux layer to perform welding. The welding method has the advantages of stable inherent welding quality, high welding productivity, no arc light, little smoke and the like, and becomes a main welding method in the manufacture of important steel structures such as pressure vessels, pipe sections, box-type beam columns and the like.
Automatic submerged arc welding: the flux is uniformly deposited on the assembled workpiece after flowing out of the hopper, and the welding wire is fed into a welding arc area through a wire feeding roller and a conductive nozzle by a wire feeding mechanism. Two ends of the welding power supply are respectively connected with the contact tip and the workpiece. The wire feeder, flux hopper, and control panel are typically mounted on a cart for movement of the welding arc. In the welding process, a layer of granular flux with the thickness of 30-50 mm is covered on the position to be welded of a workpiece, an electric arc is generated between the continuously fed welding wire and the workpiece under the flux layer, and the welding wire, the workpiece and the flux are melted by the heat of the electric arc to form a metal molten pool which is isolated from air. As the welder automatically moves forward, the arc continuously melts the forward weldment metal, welding wire and flux, the edge behind the molten pool begins to cool and solidify to form a weld bead, and the liquid slag then condenses to form a hard skull.
The output characteristic control mode of the current constant current submerged arc welding machine is shown in fig. 1 and fig. 2, VIg is a given current proportional reference voltage signal, VIfb is a feedback current proportional voltage signal, VIg and VIfb carry out Proportional Integral (PI) or Proportional Integral Derivative (PID) operation, the operation result VIo controls the output current of the welding machine power unit, the output current of the welding machine power unit is controlled to be positively correlated with the operation result VIo, and constant current output of the welding machine power unit is achieved.
At present, the output characteristics of a submerged arc welding machine are divided into constant voltage characteristics and constant current characteristics, wherein the constant voltage characteristics are mainly applied to thin wire submerged arc welding, and the constant current characteristics are mainly applied to thick wire submerged arc welding.
When the constant current submerged arc welding is carried out, the output current of the welding machine is constant, and the arc voltage is adjusted by the wire feeding speed of the wire feeding motor. During welding, the wire feeding speed can be adjusted in real time according to the arc voltage, the wire feeding speed is increased when the voltage is increased, and the wire feeding speed is slowed down when the voltage is reduced so as to achieve the purpose of stabilizing the voltage, so the variable-speed wire feeding is realized.
The output constant current characteristic of the welding machine is combined with the variable-speed wire feeding of the wire feeding motor, so that the submerged-arc welding has a good welding effect when welding thick wires. However, the inertia of the wire feeding motor is limited, and when the welding voltage changes, the wire feeding motor cannot respond to the voltage change speed in real time, and only the voltage fluctuation can be controlled within a certain range. In view of the above, in the prior art, the voltage regulation range is relatively narrow, and particularly, when the voltage setting is low, the conditions of uneven weld formation, even unstable welding, and the like, of the molten pool temperature can occur. Thus resulting in a limited application of narrow regulation ranges for submerged arc welding.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a submerged arc welding molten bath energy compensation circuit, make submerged arc welding machine can not only keep output constant current characteristic when welding voltage is stable, and when welding voltage changes, can real-time response voltage change speed adjustment welding current, demonstrate better electric arc energy compensation characteristic when welding voltage acutely changes, the voltage control range is relatively broad, electric arc energy also can obtain the compensation when welding voltage sets up lower, the molten bath temperature is inhomogeneous and lead to the poor or the welding circumstances such as unstable of welding seam shaping can not appear yet.
In order to solve the technical problem, the utility model provides a submerged arc welding molten bath energy compensation circuit, it includes reference voltage output unit, current arithmetic element, voltage feedback unit, current feedback unit and welding machine power unit;
the reference voltage output unit is used for outputting a proportional reference voltage signal VIg of given current to a second input end of the current operation unit;
the voltage feedback unit is used for outputting a voltage sampling signal Vfb of the output end of the welding machine power unit to a first input end of the voltage operation unit;
the current feedback unit is used for sampling and converting the current of the output end of the welding machine power unit into a proportional voltage signal VIfb and outputting the proportional voltage signal VIfb to the first input end of the current operation unit;
the current operation unit is used for carrying out proportional integral or proportional integral derivative operation on a proportional reference voltage signal VIg of a given current and a proportional voltage signal VIfb of the current sample, and outputting a first operation result voltage signal VIo to a second input end of the voltage operation unit;
the voltage operation unit is used for carrying out differential or proportional differential operation on the first operation result voltage signal VIo and the voltage sampling signal Vfb and outputting a second operation result voltage signal Vo to the input end of the welding machine power unit;
the output current of the welder power unit is positively correlated with the second operation result voltage signal Vo.
Preferably, the output current of the welder power unit is in a direct proportion to the second operation result voltage signal Vo.
Preferably, the current operation unit is a proportional-integral circuit;
the proportional-integral circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a first operational amplifier U1;
a proportional reference voltage signal VIg of a given current is connected with the positive input end of the first operational amplifier U1 through a third resistor R3;
the current sampling proportional voltage signal VIfb is connected with the negative input end of the first operational amplifier U1 through a second resistor R2;
the first resistor R1 and the first capacitor C1 are connected in series between the negative input end and the output end of the first operational amplifier U1.
Preferably, the first resistor R1 is 1K Ω -100K Ω.
Preferably, the second resistor R2 and the third resistor R3 are 100 Ω -10K Ω.
Preferably, the first capacitor C1 is 10 nF-2 μ f.
Preferably, the voltage operation unit is a proportional-derivative circuit;
the proportional derivative circuit comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second capacitor C2 and a second operational amplifier U2;
the first operation result voltage signal VIo is connected to the positive input terminal of the second operational amplifier U2 through the fourth resistor R4;
the voltage sampling signal Vfb is connected to the negative input terminal of the second operational amplifier U2 through a fifth resistor R5 and a second capacitor C2;
the sixth resistor R6 is connected in series between the negative input terminal and the output terminal of the second operational amplifier U2.
Preferably, the sixth resistor R6 is 1K Ω to 100K Ω.
Preferably, the fourth resistor R4 and the fifth resistor R5 are 100 Ω -10K Ω.
Preferably, the second capacitor C2 is 10 nF-1 μ f.
The utility model discloses a submerged arc welding molten bath energy compensating circuit, when welding voltage changes, output current towards opposite direction change of ability feedback control welding machine power unit, make submerged arc welding machine can not only keep output constant current characteristic when welding voltage is stable, and when welding voltage changes, can real-time response voltage change speed adjustment welding current, demonstrate better electric arc energy compensation characteristic when welding voltage violently changes, the voltage control scope is relatively broad, electric arc energy also can obtain the compensation when welding voltage sets up lowly, the molten bath temperature is inhomogeneous and lead to the welding seam to become poor or the circumstances such as welding unstability can not appear yet.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the present invention are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of output characteristic control of a conventional constant-current submerged arc welding machine;
FIG. 2 is a circuit diagram of output characteristic control of a current submerged arc welding machine;
FIG. 3 is a schematic diagram of an embodiment of the submerged arc welding molten pool energy compensation circuit of the present invention;
fig. 4 is a circuit diagram of an embodiment of the submerged arc welding bath energy compensation circuit of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 3, the submerged arc welding molten pool energy compensation circuit comprises a reference voltage output unit, a current operation unit, a voltage feedback unit, a current feedback unit and a welding machine power unit;
the reference voltage output unit is used for outputting a proportional reference voltage signal VIg of given current to a second input end of the current operation unit;
the voltage feedback unit is used for outputting a voltage sampling signal Vfb of the output end of the welding machine power unit to a first input end of the voltage operation unit;
the current feedback unit is used for sampling and converting the current of the output end of the welding machine power unit into a proportional voltage signal VIfb and outputting the proportional voltage signal VIfb to the first input end of the current operation unit;
the current operation unit is used for performing Proportional Integral (PI) or Proportional Integral Derivative (PID) operation on a proportional reference voltage signal VIg of a given current and a proportional voltage signal VIfb of the current sample, and outputting a first operation result voltage signal VIo to a second input end of the voltage operation unit;
the voltage operation unit is used for carrying out differential (D) or Proportional Differential (PD) operation on the first operation result voltage signal VIo and the voltage sampling signal Vfb and outputting a second operation result voltage signal Vo to the input end of the welding machine power unit;
the output current of the welder power unit is positively correlated with the second operation result voltage signal Vo.
Preferably, the output current of the welder power unit is in a direct proportion to the second operation result voltage signal Vo.
The submerged arc welding molten pool energy compensation circuit of the first embodiment has current feedback and voltage feedback at the same time, and has a voltage operation unit with voltage feedback and a current operation unit with current feedback at the same time, a first operation result voltage signal VIo output by the current operation unit does not directly enter a welding machine power unit, but enters a voltage operation unit, the voltage operation unit carries out differential (D) or Proportional Differential (PD) operation on the first operation result voltage signal VIo and a feedback voltage sampling signal Vfb, and outputs a second operation result voltage signal Vo to control the welding machine power unit.
The submerged arc welding molten pool energy compensation circuit of the first embodiment can control the output end current of the welding machine power unit to change towards the opposite direction in a feedback mode when the welding voltage changes, so that the submerged arc welding machine can not only keep the constant current output characteristic when the welding voltage is stable, but also adjust the welding current in real time in response to the voltage change speed when the welding voltage changes, the submerged arc welding molten pool energy compensation circuit shows a good arc energy compensation characteristic when the welding voltage changes violently, the voltage adjustment range is relatively wide, the arc energy can be compensated when the welding voltage is set to be low, and the situations that welding seam forming is poor or welding is unstable and the like due to non-uniform molten pool temperature cannot occur.
Example two
The submerged arc welding pool energy compensation circuit based on the first embodiment is shown in fig. 4, wherein the current operation unit is a Proportional Integral (PI) circuit;
the proportional-integral (PI) circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a first operational amplifier U1;
a proportional reference voltage signal VIg of a given current is connected with the positive input end of the first operational amplifier U1 through a third resistor R3;
the current sampling proportional voltage signal VIfb is connected with the negative input end of the first operational amplifier U1 through a second resistor R2;
the first resistor R1 and the first capacitor C1 are connected in series between the negative input end and the output end of the first operational amplifier U1.
Preferably, the first resistor R1 is 1K omega-100K omega; the second resistor R2 and the third resistor R3 are 100 omega-10K omega; the first capacitance C1 is 10 nF-2 muf.
EXAMPLE III
The submerged arc welding pool energy compensation circuit based on the first embodiment is shown in fig. 4, and the voltage operation unit is a Proportional Differential (PD) circuit;
the proportional-derivative (PD) circuit comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second capacitor C2 and a second operational amplifier U2;
the first operation result voltage signal VIo is connected to the positive input terminal of the second operational amplifier U2 through the fourth resistor R4;
the voltage sampling signal Vfb is connected to the negative input terminal of the second operational amplifier U2 through a fifth resistor R5 and a second capacitor C2;
the sixth resistor R6 is connected in series between the negative input terminal and the output terminal of the second operational amplifier U2.
Preferably, the sixth resistor R6 is 1K Ω to 100K Ω; the fourth resistor R4 and the fifth resistor R5 are 100 omega-10K omega; the second capacitance C2 is 10 nF-1 muf.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A submerged arc welding molten pool energy compensation circuit is characterized by comprising a reference voltage output unit, a current operation unit, a voltage feedback unit, a current feedback unit and a welding machine power unit;
the reference voltage output unit is used for outputting a proportional reference voltage signal (VIg) of given current to a second input end of the current operation unit;
the voltage feedback unit is used for outputting a voltage sampling signal (Vfb) at the output end of the welding machine power unit to the first input end of the voltage operation unit;
the current feedback unit is used for converting the current sampling of the output end of the welding machine power unit into a proportional voltage signal (VIfb) and outputting the proportional voltage signal (VIfb) to the first input end of the current operation unit;
the current operation unit is used for carrying out proportional integral or proportional integral derivative operation on a proportional reference voltage signal (VIg) of given current and a proportional voltage signal (VIfb) of the current sample, and outputting a first operation result voltage signal (VIo) to a second input end of the voltage operation unit;
the voltage operation unit is used for carrying out differential or proportional differential operation on the first operation result voltage signal (VIo) and the voltage sampling signal (Vfb) and outputting a second operation result voltage signal (Vo) to the input end of the welding machine power unit;
and the output current of the welding machine power unit is positively correlated with the second operation result voltage signal (Vo).
2. The submerged arc welding pool energy compensation circuit of claim 1,
the output current of the welder power unit is in a direct proportion relation with the second operation result voltage signal (Vo).
3. The submerged arc welding pool energy compensation circuit of claim 1,
the current operation unit is a proportional-integral circuit;
the proportional-integral circuit comprises a first resistor (R1), a second resistor (R2), a third resistor (R3), a first capacitor (C1) and a first operational amplifier (U1);
a proportional reference voltage signal (VIg) of a given current is connected with the positive input end of the first operational amplifier (U1) through a third resistor (R3);
the proportional voltage signal (VIfb) of the current sample is connected with the negative input end of the first operational amplifier (U1) through a second resistor (R2);
the first resistor (R1) and the first capacitor (C1) are connected in series between the negative input end and the output end of the first operational amplifier (U1).
4. The submerged arc welding pool energy compensation circuit of claim 3,
the first resistor (R1) is 1K omega-100K omega.
5. The submerged arc welding pool energy compensation circuit of claim 3,
the second resistor (R2) and the third resistor (R3) are 100 Ω -10K Ω.
6. The submerged arc welding pool energy compensation circuit of claim 3,
the first capacitance (C1) is 10 nF-2 muf.
7. The submerged arc welding pool energy compensation circuit of claim 1,
the voltage operation unit is a proportional differential circuit;
the proportional differential circuit comprises a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a second capacitor (C2) and a second operational amplifier (U2);
the first operation result voltage signal (VIo) is connected to the positive input terminal of the second operational amplifier (U2) through the fourth resistor (R4);
the voltage sampling signal (Vfb) is connected with the negative input end of the second operational amplifier (U2) through a fifth resistor (R5) and a second capacitor (C2);
the sixth resistor (R6) is connected in series between the negative input terminal and the output terminal of the second operational amplifier (U2).
8. The submerged arc welding pool energy compensation circuit of claim 7,
the sixth resistor (R6) is 1K omega-100K omega.
9. The submerged arc welding pool energy compensation circuit of claim 1,
the fourth resistor (R4) and the fifth resistor (R5) are 100 omega-10K omega.
10. The submerged arc welding pool energy compensation circuit of claim 1,
the second capacitance (C2) is 10 nF-1 muf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922153359.3U CN211331733U (en) | 2019-12-02 | 2019-12-02 | Submerged arc welding molten pool energy compensation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922153359.3U CN211331733U (en) | 2019-12-02 | 2019-12-02 | Submerged arc welding molten pool energy compensation circuit |
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| Publication Number | Publication Date |
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| CN211331733U true CN211331733U (en) | 2020-08-25 |
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| CN201922153359.3U Active CN211331733U (en) | 2019-12-02 | 2019-12-02 | Submerged arc welding molten pool energy compensation circuit |
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