CN114367720A - Control method and device for stabilizing molten pool based on direct current arc welding machine and storage medium - Google Patents
Control method and device for stabilizing molten pool based on direct current arc welding machine and storage medium Download PDFInfo
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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
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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
- B23K9/095—Monitoring or automatic control of welding parameters
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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
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Abstract
The embodiment of the application discloses a control method and device for stabilizing a molten pool based on a direct current arc welding machine and a storage medium. The method comprises the steps of obtaining a current value and a current frequency of an initial arcing stage; and if detecting that the welding process of the direct current arc welding machine is in an arc burning stage, controlling the direct current arc welding machine to output pulse current, wherein the current value of the pulse current is greater than that of the initial arc burning stage, and the frequency of the pulse current is higher than that of the initial arc burning stage. The technical scheme can stabilize the molten pool and avoid the molten pool from vibrating, thereby achieving the purpose of stabilizing welding.
Description
Technical Field
The application relates to the field of electric arc welding, in particular to a control method and device for stabilizing a molten pool based on a direct-current electric arc welding machine and a storage medium.
Background
In the actual production, the irregular short circuit phenomenon caused by irregular contact between the molten metal at the end of the welding wire and the molten pool due to the oscillation of the molten pool in the direct current arc welding process of carbon steel, stainless steel and aluminum alloy; in the direct current welding process, the welding process is as follows: the welding wire melts → contacts with a molten pool and transits → necks down and separates from the molten pool → forms electric arc → melts the welding wire after separation, the process is circulated, if the amount of the molten metal in each transition is consistent, the molten pool is also stable, the transition frequency is stable, the splashing is small, the forming is attractive and has no ripple, if the molten pool is unstable and vibrates up and down, the welding wire can frequently contact with the molten pool to generate short circuit, the short circuit time is long or short, the transition is not uniform, and the phenomenon is further aggravated.
Therefore, the technicians need to find a method capable of stabilizing the molten pool, so that the transition frequency is stable, the consistency of the size of the molten ball is stable, and the purpose of controlling the oscillation of the molten pool is achieved.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present application respectively provide a control method and device for stabilizing a molten pool based on a dc arc welder, a dc arc welder and a computer readable storage medium, by which the molten pool is stabilized and the molten pool is prevented from oscillating.
According to an aspect of an embodiment of the present application, there is provided a control method for stabilizing a molten pool based on a direct current arc welder, including: acquiring a current value and a current frequency of an initial arcing stage; and if detecting that the welding process of the direct current arc welding machine is in an arc burning stage, controlling the direct current arc welding machine to output pulse current, wherein the current value of the pulse current is greater than that of the initial arc burning stage, and the frequency of the pulse current is higher than that of the initial arc burning stage.
In another exemplary embodiment, the obtaining the current value and the current frequency of the initial arcing stage includes: according to the current waveform of the normal short circuit welding of the direct current arc welding machine, an initial short circuit stage, an initial necking stage and the initial arcing stage which are adjacent in sequence in an initial period are obtained; and acquiring the current value and the current frequency of the initial arcing stage.
In another exemplary embodiment, the obtaining, according to a current waveform of normal short-circuit welding of the dc arc welder, an initial short-circuit stage, an initial necking stage, and the initial arcing stage that are immediately adjacent in an initial period includes: and finding a stage in which the current value is reduced in an inner curve type according to the current waveform, and taking the stage as the initial arcing stage.
In another exemplary embodiment, the initial period includes at least two initial sub-periods, and after the controlling the dc arc welder to output a pulsed current, the method further includes: and if the welding process of the direct current arc welding machine is detected to enter the initial short-circuit stage of the next initial sub-period, stopping outputting the pulse current.
In another exemplary embodiment, after said controlling said dc arc welder to output a pulsed current, said method further comprises: and if the continuous output time length of the pulse current reaches a preset time length, stopping outputting the pulse current.
According to an aspect of an embodiment of the present application, there is provided a control apparatus of a direct current electric arc welder, including: the acquisition module is configured to acquire a current value and a current frequency in an initial arcing stage; and the comparison control module is configured to control the direct current arc welding machine to output pulse current if the welding process of the direct current arc welding machine is detected to be in an arc burning stage, wherein the current value of the pulse current is greater than that of the initial arc burning stage, and the frequency of the pulse current is higher than that of the initial arc burning stage.
According to an aspect of an embodiment of the present application, there is provided a direct current arc welder including: the welding gun is used for welding work; the alternating current-direct current converter is used for converting alternating current and direct current of a power supply; the controller is electrically connected with the alternating current-direct current converter and the welding gun so as to execute the control method; and the welding box main body is used for loading the alternating current-direct current converter and the controller and is electrically connected with the welding gun.
According to an aspect of embodiments of the present application, there is provided a computer-readable storage medium having stored thereon computer-readable instructions which, when executed by a processor of a computer, cause the computer to execute the above-described control method.
In the technical scheme provided by the embodiment of the application, the current value and the current frequency of the initial arcing stage are obtained, and in order to promote the stability of a molten pool as soon as possible, pulse current with a certain frequency is output in the current reduction process of the arcing stage, the current value of the pulse current is greater than that of the initial arcing stage, and the frequency of the pulse current is higher than that of the initial arcing stage; the method can generate voltage waveforms with similar pulse forms, the voltage changes can be approximately understood as the changes of arc plasmas, high-frequency arcs are generated in the arcing stage, the arc plasmas are used for suppressing the oscillation of a molten pool, the molten pool is forced to be calmed down quickly, enough space is reserved for the growth of molten drops in the next transition, and similar pulse effects are output when the next molten drop is in short circuit contact → necking separation → re-arcing, so that the molten pool is stable in transition frequency, the molten pool is prevented from oscillating, and the purpose of stable welding is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is to be understood that the drawings in the following description are merely exemplary of the application and that other drawings may be derived from those drawings by those skilled in the art without undue burden. In the drawings:
FIG. 1 is a flow chart illustrating a method of controlling a steady puddle based DC arc welder in accordance with an exemplary embodiment of the present application;
FIG. 2 is a graph of voltage and current waveforms for an arc stage shown in an exemplary embodiment of the present application;
FIG. 3 is a flow chart illustrating a method of controlling a steady puddle based DC arc welder in accordance with another exemplary embodiment of the present application;
FIG. 4 is a graph of current and voltage waveforms during a normal short circuit welding process for a direct current arc welder illustrated in another exemplary embodiment of the present application;
FIG. 5 is a schematic structural view of a control apparatus for a direct current arc welder in accordance with an exemplary embodiment of the present application;
FIG. 6 is a schematic diagram of a DC arc welder shown in an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The block diagrams depicted in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
Reference to "a plurality" in this application means two or more. "and/or" describe the association relationship of the associated objects, meaning that there may be three relationships, e.g., A and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Referring first to fig. 1, fig. 1 is a flow chart illustrating a method for controlling a stabilized weld puddle based on a dc arc welder according to an exemplary embodiment of the present application. The method at least includes steps S110 to S120, which are described in detail as follows:
s110: and acquiring a current value and a current frequency of an initial arcing stage.
The initial arcing phase is understood to be the arcing phase in the normal welding process of the electric arc welder, and the initial arcing phase can be identified by the existing method, so that the current value and the current frequency of the initial arcing phase are obtained.
The existing method is exemplified to judge the arc stage of the electric arc welder: collecting output current of a direct current arc welding machine; determining a given voltage of the direct current arc welding machine; controlling the given voltage not to be greater than a first threshold; judging whether the output current of the direct current arc welding machine is reduced or not; when the output current is decreased, it is determined that the dc arc welding machine enters the arc stage, the detailed determining step may refer to chinese patent CN201710835448.9, the example herein does not limit the determining manner of the initial arc stage, and the embodiment further includes other methods for determining the initial arc stage, so as to obtain the current value and the current frequency of the initial arc stage.
S120: and if the welding process of the direct current arc welding machine is detected to be in an arc burning stage, controlling the direct current arc welding machine to output pulse current, wherein the current value of the pulse current is greater than that of the initial arc burning stage, and the frequency of the pulse current is higher than that of the initial arc burning stage.
As shown in fig. 2, fig. 2 is a graph of voltage and current waveforms for an arc stage shown in an exemplary embodiment of the present application. The pulse current is greater than the current value of the initial arcing stage, and the frequency of the pulse current is higher than the current frequency of the initial arcing stage.
The step explains that the pulse current is controlled to be output when the welding process of the direct current arc welding machine is detected to be in an arc burning stage, the pulse current recorded in the embodiment is current or voltage pulse which appears repeatedly in a period, and the pulse current appears in the same direction and does not appear in the positive and negative alternating directions because the embodiment is based on the welding process of the direct current arc welding machine, and the method can not be realized based on the alternating current arc pulse welding machine.
For example, S120: if the welding process of the direct current arc welding machine is detected to be in an arc stage, the direct current arc welding machine is controlled to output a pulse current with the current value of 100A and the frequency of 800Hz, the current value of the initial arc stage is 80A and the frequency of 0Hz, namely no pulse exists in the initial arc stage, the current value of the output pulse current is controlled to be larger than the current value of the initial arc stage, and the frequency of the pulse current is higher than the current frequency of the initial arc stage.
The method comprises the steps of obtaining a current value and a current frequency of an initial arcing stage, outputting a pulse current with a certain frequency in a current reduction process of the arcing stage in order to enable a molten pool to be stable as soon as possible, wherein the current value of the pulse current is larger than that of the initial arcing stage, and the frequency of the pulse current is higher than that of the initial arcing stage; the method can generate voltage waveforms with similar pulse forms, the voltage changes can be approximately interpreted as the changes of arc plasmas, high-frequency arcs are generated in the arcing stage, the arc plasmas are used for suppressing the oscillation of a molten pool, the molten pool is forced to be calmed down quickly, enough space is reserved for the growth of molten drops in the next transition, and similar pulse effects are output when the next molten drop is in short circuit contact → necking separation → re-arcing, so that the molten pool is stable in the transition frequency of the molten drops, the molten pool is prevented from oscillating, and the purpose of stable welding is achieved.
In another exemplary embodiment, referring to fig. 3, fig. 3 is a flowchart illustrating a method for controlling a stable weld puddle based on a dc arc welder according to another exemplary embodiment of the present application, further describing S110, which at least includes S310 to S320, and is described in detail as follows:
s310: according to the current waveform of normal short circuit welding of the direct current arc welding machine, an initial short circuit stage, an initial necking stage and an initial arcing stage which are sequentially adjacent in an initial period are obtained.
Referring to fig. 4, fig. 4 is a graph of current and voltage waveforms during a normal short circuit weld of a direct current arc welder shown in another exemplary embodiment of the present application. The current and voltage waveforms are changed periodically, and an initial short circuit stage, an initial necking stage and an initial arcing stage which are sequentially adjacent in a period can be obtained according to the current and voltage waveforms, which are shown in fig. 4.
S320: and acquiring a current value and a current frequency of an initial arcing stage.
And after the initial arc stage is obtained through a current or voltage waveform diagram in the normal short-circuit welding process of the direct current arc welding machine in the initial arc stage, obtaining a current value and a current frequency in the corresponding initial arc stage according to the waveform diagram.
The embodiment of the application further illustrates that the initial arcing stage can be determined through the current waveform of the normal short-circuit welding of the direct-current arc welding machine, and the current value and the current frequency of the initial arcing stage can be determined more conveniently and visually.
In another exemplary embodiment, based on S310 in the above embodiment, the stage in which the value of the current is decreased in an inner curve type is found according to the current waveform, and the stage is taken as the initial arcing stage. Further, how to search for the initial arcing stage, that is, the current value change in the initial arcing stage is described, it should be noted that in the embodiment of the present application, the initial arcing stage is not searched for only by the change of the current value, but also by the change of the voltage value. As shown in fig. 4, the waveforms of the voltage and the current are periodically corresponding, and the initial short-circuit stage, the initial necking stage and the initial arcing stage in the above embodiment can be one-to-one corresponding to and found in the current waveform or the voltage waveform.
The embodiment further illustrates how to find the initial arcing stage specifically by the current waveform, that is, the initial arcing stage is determined by the characteristics of current change, and the phase change illustrates that the value of the current in the initial arcing stage decreases in an inner curve manner.
In another exemplary embodiment, the initial period includes at least two initial sub-periods, and after the step S310, the output of the pulse current is stopped until the welding process of the dc arc welder is detected to enter the initial short-circuit phase of the next initial sub-period.
For example, the initial cycle includes a first initial sub-cycle and a second initial sub-cycle, where the first initial sub-cycle includes a first initial short-circuit stage, a first initial necking stage, and a first initial arcing stage; the second initial sub-period comprises a second initial short-circuit stage, a second initial necking stage and a second initial arcing stage; phase sequencing of the first initial sub-period and the second initial sub-period: first initial short stage → first initial necking stage → first initial arcing stage → second initial short stage → second initial necking stage → second initial arcing stage. And if the welding process of the direct current arc welder enters the initial short-circuit stage of the next initial sub-period, namely after the welding process of the direct current arc welder enters the second initial short-circuit stage from the first initial arc burning stage, stopping outputting the pulse current.
The definition of the initial period in this embodiment more conveniently explains that the initial short circuit stage, the initial necking stage and the initial arcing stage are in close proximity periodically, and explains the time point of stopping outputting the pulse current, which solves the technical problem of when to stop outputting the pulse current, so that the control of outputting the pulse current is more intelligent and can be performed periodically.
In another exemplary embodiment, after the step S120, if it is detected that the continuous output time length of the pulse current reaches the preset time length, the pulse current is stopped to be output. That is, in the present embodiment, the pulse current is continuously controlled to be output for a preset time, for example, the preset time is 10 seconds, and the pulse current is continuously output for 10 seconds, that is, the output is stopped after the pulse current is continuously output for 10 seconds.
The embodiment of the application provides another method for solving the technical problem of properly stopping outputting the pulse current, and the pulse current is output by setting the duration control of the preset time, so that the time for outputting the pulse current is fixed, and the method is convenient and beneficial to control.
An embodiment of the present application further provides a control device of a dc arc welder, as shown in fig. 5, fig. 5 is a schematic structural diagram of a control device of a dc arc welder shown in an exemplary embodiment of the present application. The control device of a direct current electric arc welder comprises: an obtaining module 510 configured to obtain a current value and a current frequency at an initial arcing stage; and the comparison control module 520 is configured to control the direct current arc welding machine to output pulse current if the welding process of the direct current arc welding machine is detected to be in an arc burning stage, wherein the current value of the pulse current is greater than that of the initial arc burning stage, and the frequency of the pulse current is higher than that of the initial arc burning stage.
In another embodiment, the obtaining module 510 is configured to obtain an initial short-circuit stage, an initial necking stage, and an initial arcing stage, which are sequentially adjacent to each other in an initial period, according to a current waveform of normal short-circuit welding of the dc arc welder; and acquiring a current value and a current frequency of an initial arcing stage.
In another embodiment, the obtaining module 510 is configured to find a stage where the current value decreases in an inner curve form according to the current waveform, and then take the stage as an initial arcing stage; and acquiring a current value and a current frequency of an initial arcing stage.
In another embodiment, the comparison control module 520 is configured to obtain an initial short-circuit stage, an initial necking stage, and an initial arcing stage, which are sequentially adjacent to each other in an initial period, according to a current waveform of normal short-circuit welding of the dc arc welder; acquiring a current value and a current frequency of an initial arcing stage; the initial period comprises at least two initial sub-periods, and the pulse current is stopped from being output until the welding process of the direct current arc welder enters the initial short-circuit stage of the next initial sub-period.
In another embodiment, the comparison control module 520 is configured to control the dc arc welder to output a pulse current if it is detected that the welding process of the dc arc welder is in an arc stage, wherein a current value of the pulse current is greater than a current value in an initial arc stage, and a frequency of the pulse current is higher than a current frequency in the initial arc stage; and if the continuous output time length of the pulse current reaches the preset time length, stopping outputting the pulse current.
An embodiment of the present application further provides a dc arc welder, as shown in fig. 6, fig. 6 is a schematic structural diagram of a dc arc welder shown in an exemplary embodiment of the present application. The direct current arc welder comprises: a welding torch 610 for welding work; an ac-dc converter 620 for converting ac and dc power of the power supply; a controller 630 electrically connected to the ac-dc converter 620 and the welding gun 610 to execute the above control method; the welding torch body 600 is used for loading the ac/dc converter 620 and the controller 630, and is electrically connected to the welding torch 610.
Embodiments of the present application also provide a computer-readable storage medium, on which computer-readable instructions are stored, and when the computer-readable instructions are executed by a processor of a computer, the computer is caused to execute the control method as described above.
It should be noted that the computer readable medium shown in the embodiments of the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. The computer readable storage medium may be, for example, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), an Erasable Programmable Read-Only Memory (EPROM), a flash Memory, an optical fiber, a portable Compact Disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
It should also be noted that the flowchart and block diagrams in the figures of the present application illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. Each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present application may be implemented by software or by hardware, and the described units may also be disposed in a processor. Where the name of such an element does not in some cases constitute a limitation on the element itself.
The above description is only a preferred exemplary embodiment of the present application, and not intended to limit the embodiments of the present application, and those skilled in the art can easily make various changes and modifications according to the main concept and spirit of the present application, so that the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A control method for stabilizing a molten pool based on a direct current arc welding machine is characterized by comprising the following steps:
acquiring a current value and a current frequency of an initial arcing stage;
and if detecting that the welding process of the direct current arc welding machine is in an arc burning stage, controlling the direct current arc welding machine to output pulse current, wherein the current value of the pulse current is greater than that of the initial arc burning stage, and the frequency of the pulse current is higher than that of the initial arc burning stage.
2. The control method according to claim 1, wherein the obtaining of the current value and the current frequency of the initial arcing stage comprises:
according to the current waveform of the normal short circuit welding of the direct current arc welding machine, an initial short circuit stage, an initial necking stage and the initial arcing stage which are adjacent in sequence in an initial period are obtained;
and acquiring the current value and the current frequency of the initial arcing stage.
3. The control method according to claim 2, wherein the obtaining of the initial short-circuit stage, the initial necking stage and the initial arcing stage which are adjacent in sequence in the initial period according to the current waveform of the normal short-circuit welding of the direct-current electric arc welding machine comprises:
and finding a stage in which the current value is reduced in an inner curve type according to the current waveform, and taking the stage as the initial arcing stage.
4. The control method of claim 2 wherein said initial period comprises at least two initial sub-periods, and wherein after said controlling said dc arc welder to output a pulsed current, said method further comprises:
and if the welding process of the direct current arc welding machine is detected to enter the initial short-circuit stage of the next initial sub-period, stopping outputting the pulse current.
5. The control method of claim 1, wherein after said controlling said direct current arc welder to output a pulsed current, said method further comprises:
and if the continuous output time length of the pulse current is detected to reach the preset time length, stopping outputting the pulse current.
6. A control device for a direct current arc welder, comprising:
the acquisition module is configured to acquire a current value and a current frequency in an initial arcing stage;
and the comparison control module is configured to control the direct current arc welding machine to output pulse current if the welding process of the direct current arc welding machine is detected to be in an arc burning stage, wherein the current value of the pulse current is greater than that of the initial arc burning stage, and the frequency of the pulse current is higher than that of the initial arc burning stage.
7. A direct current arc welder, comprising:
the welding gun is used for welding work;
the alternating current-direct current converter is used for converting alternating current and direct current of a power supply;
a controller electrically connected to the ac-dc converter and the welding gun to perform the control method of any one of claims 1-5;
and the welding box main body is used for loading the alternating current-direct current converter and the controller and is electrically connected with the welding gun.
8. A computer-readable storage medium having stored thereon computer-readable instructions which, when executed by a processor of a computer, cause the computer to execute the control method of any one of claims 1 to 5.
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