WO2024022386A1

WO2024022386A1 - Contact tip to workpiece distance control method, apparatus, and device, and storage medium

Info

Publication number: WO2024022386A1
Application number: PCT/CN2023/109329
Authority: WO
Inventors: 郑兵
Original assignee: 深圳市爱达思技术有限公司
Priority date: 2022-07-27
Filing date: 2023-07-26
Publication date: 2024-02-01
Also published as: CN115255571A

Abstract

A contact tip to workpiece distance (CTWD) control method, comprising: before welding is started, according to a received welding energy parameter and preset association relationships, determining and indicating a CTWD to be recommended corresponding to the welding energy parameter; determining a target CTWD according to the CTWD to be recommended; and generating a position instruction according to the target CTWD, and controlling the moving position of an electrode wire according to the position instruction, so that the distance between a contact tip and a workpiece is matched with the target CTWD. The CTWD control method can better guarantee the stability of the welding process and the welding seam forming quality, improve the welding quality, and achieve automatic presetting of CTWDs by means of automatic position control of CTWDs. Also provided are a CTWD control apparatus (40), a CTWD control device (50), and a storage medium.

Description

Welding wire extension length control method, device, equipment and storage medium

This application claims priority to the Chinese patent application filed with the China Patent Office on July 27, 2022, with the application number 202210893849.0 and the invention title "Welding wire extension length control method, device, equipment and storage medium", all of which The contents are incorporated into this application by reference.

Technical field

The present application belongs to the field of welding technology, and in particular relates to a method, device, equipment and storage medium for controlling the extension length of a welding wire.

Background technique

In gas metal arc welding, the length of the welding wire extending from the end of the contact tip to the surface of the workpiece is called the contact tip to workpiece distance (hereinafter referred to as CTWD).

Due to the lack of unified and standardized standards for the selection of CTWD, it is usually selected by welding workers based on experience. In addition, after selecting the CTWD, the welding staff also needs to complete the presetting of its position, such as sending the welding wire out of the contact tip for a length L, which length L must be greater than or equal to the selected CTWD, and then cutting off the excess welding wire. So that the remaining length of the welding wire protruding from the end face of the contact tip is exactly equal to the selected CTWD.

The current choice of CTWD relies on the work experience of the welding staff, and its reliability is low, resulting in unstable welding quality; and its position needs to be preset manually, which is inefficient and cannot meet the requirements of high-quality welding production.

technical problem

In view of the above background, embodiments of the present application provide a method for controlling the extension length of the welding wire to solve the technical problems of low reliability and low efficiency of CTWD position preset in the prior art.

Technical solutions

In a first aspect, embodiments of the present application provide a method for controlling the extension length of a welding wire, which is characterized in that the method includes:

Before starting welding, according to the received welding energy parameters and the preset association, the recommended welding wire extension length corresponding to the welding energy parameters is determined and indicated, where the welding wire extension length is used to describe the relationship between the contact tip and the workpiece distance, and the preset correlation includes a correlation between the welding energy parameter and the recommended welding wire extension length;

Determine the target welding wire extension length according to the recommended welding wire extension length;

A position instruction is generated according to the target welding wire extension length, and the moving position of the welding wire is controlled according to the position instruction so that the distance between the contact tip and the workpiece matches the target welding wire extension length.

In a possible implementation of the first aspect, the indication includes: one or more of a visual indication, an auditory indication, and a tactile indication.

In a possible implementation of the first aspect, the welding energy parameter includes welding current;

In the correlation relationship, the welding current and the recommended welding wire extension length are negatively correlated.

In a possible implementation of the first aspect, the association relationship is stored in an array, and different arrays correspond to different wire feeding speeds;

Each array contains the median value, the upper limit value and the lower limit value of the welding current, as well as the recommended welding wire extension length corresponding to the median value, the upper limit value and the lower limit value respectively.

In a possible implementation of the first aspect, determining the target welding wire extension length according to the recommended welding wire extension length includes:

Receive control instructions input by the user;

In the case where the control instruction is a first instruction, the recommended welding wire extension length is determined as the target welding wire extension length;

When the control instruction is the second instruction, the length parameter input by the user is received, and the length parameter is determined as the target welding wire extension length.

In a possible implementation of the first aspect, controlling the moving position of the welding wire according to the position instruction includes:

The position instruction is sent to the wire feeding unit, so that the wire feeding unit performs PID control of the moving position of the welding wire according to the position instruction.

In a possible implementation of the first aspect, the welding energy parameters include: one or more of welding current, welding voltage, workpiece thickness, welding power, and welding impedance.

Before starting welding, CTWD is the same as the wire extension length (dry extension). CTWD can be preset by presetting the position of the wire extension length. The welding wire extension length control method provided by the embodiment of the present application determines and indicates the recommended welding wire extension length according to the welding energy parameters selected by the user, and determines the target welding wire extension length based on the recommended welding wire extension length, that is, the preset CTWD is determined position; this method does not need to rely on the user's choice of CTWD, which reduces the skill requirements of the welding staff and ensures the stability of the welding quality; and using the recommended and tested CTWD can better ensure the safety of the welding process. The stability and welding seam formation quality improve the welding quality; optionally, in this method, the automatic preset of CTWD is realized through automatic control of the welding wire extension length position, eliminating the need for manual measurement and length position adjustment, ensuring the length position accuracy and improved efficiency.

In the second aspect, embodiments of the present application provide a welding wire extension length control device, which includes:

An indication module, used to determine and indicate the recommended welding wire extension length corresponding to the welding energy parameters and the received welding energy parameters and the preset correlation before starting welding, where the welding wire extension length is used to describe the conductive The distance between the nozzle and the workpiece, the preset correlation includes the correlation between the welding energy parameter and the recommended welding wire extension length;

a determination module for determining the target welding wire extension length according to the recommended welding wire extension length;

A control module configured to generate a position instruction according to the target welding wire extension length, and to control the moving position of the welding wire according to the position instruction so that the distance between the contact tip and the workpiece matches the target welding wire extension length.

In a third aspect, embodiments of the present application provide a welding wire extension length control device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned first step is implemented. steps of any method.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of any method of the first aspect are implemented.

In a fifth aspect, embodiments of the present application provide a computer program product, which when the computer program product is run on a terminal device, causes the terminal device to execute any of the methods of the first aspect.

It can be understood that the beneficial effects of the above-mentioned second aspect to the fifth aspect can be referred to the relevant description in the above-mentioned first aspect, and will not be described again here.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the embodiments or description of the prior art. Obviously, the drawings in the following description are only for the purpose of the present application. For some embodiments, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the composition of CTWD provided by an embodiment of the present application;

Figure 2 is a schematic flow chart of a method for controlling the extension length of a welding wire provided by an embodiment of the present application;

Figure 3 is a block diagram of a PID closed-loop control system for the welding wire extension length provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of a welding wire extension length control device provided by an embodiment of the present application;

Figure 5 is a schematic diagram of the hardware composition of the welding wire extension length control device provided by an embodiment of the present application;

Figure 6 is a schematic diagram of the composition of a welding machine system provided by an embodiment of the present application.

Embodiments of the invention

In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures and technologies are provided to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

Reference in this specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Therefore, the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in other embodiments", etc. appearing in different places in this specification are not necessarily Reference is made to the same embodiment, but rather to "one or more but not all embodiments" unless specifically stated otherwise. The terms "including," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

Figure 1 is a schematic diagram of the composition of CTWD provided by an embodiment of the present application. As shown in Figure 1, 101 is the contact tip, 102 is the welding wire, 103 is the arc during welding, and 104 is the workpiece.

Among them, the extension length of the welding wire from the end of the contact tip 101 to the surface of the workpiece 104 is the distance CTWD from the contact tip to the workpiece, see L3 in Figure 1; the extension length of the welding wire 102 from the end surface of the contact tip 101 to its contact point with the arc 103 is Wire Extension (hereinafter referred to as WE), see L1 in Figure 1; the arc length between the end of the welding wire 102 and the surface of the workpiece 104 during the welding process is called arc length (Arc Length, hereafter referred to as AL), see Figure 1 L2.

Specifically, the relationship between CTWD, WE and AL is shown in the following formula (1).

CTWD = WE + AL(1)

Before starting welding, since AL is 0, CTWD is equal to WE at this time, so the CTWD position preset can be achieved by controlling the extension length of the welding wire, thereby ensuring the welding quality.

In the existing technology, CTWD is usually selected by welding workers based on experience. If the selected CTWD is inappropriate, it will seriously affect the arc ignition effect, such as difficulty in arc ignition or bursting of the welding wire, thereby reducing the quality of the weld at the arc starting point. On the other hand, manually setting the position of CTWD increases the time cost and labor intensity of welding production, and the uncertain wire feeding length may increase the number of wire feeding operations (if the wire feeding length is not enough), or the wire needs to be cut It will fall off (if the length of the welding wire delivered is sufficient), which is a waste of time and materials. Therefore, achieving scientific selection and accurate position control of CTWD is one of the important requirements to ensure weld quality and improve welding efficiency.

The following uses specific embodiments to illustrate the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems. It is worth noting that the specific embodiments listed below can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

FIG. 2 is a schematic flowchart of a method for controlling the extension length of a welding wire provided by an embodiment of the present application. The execution subject of this method is a welding machine system. As shown in Figure 2, methods include:

S10. Before starting welding, according to the received welding energy parameters and the preset correlation relationship, determine the recommended welding wire extension length corresponding to the welding energy parameters and indicate it. The welding wire extension length is used to describe the relationship between the contact tip and the workpiece. distance, and the preset correlation includes the correlation between the welding energy parameter and the recommended welding wire extension length.

In this embodiment, the welding energy parameters include: one or more of welding current, welding voltage, workpiece thickness, welding power, and welding impedance.

Among them, the welding energy parameters can be parameters input by the user or parameters selected by the user. Users are generally welding operators or welding machine maintenance personnel.

Among them, the welding voltage refers to the sum of the arc voltage and the welding wire voltage extending from the end of the contact tip to the surface of the workpiece.

In this embodiment, the method for the welding machine system to indicate the recommended welding wire extension length includes: one or more of visual indication, auditory indication, and tactile indication.

In this embodiment, the recommended welding wire extension length is the welding wire extension length that is obtained through pre-testing and can ensure that the welding performance meets the preset requirements. Among them, the welding performance meeting the preset requirements may mean that the droplet transfer frequency is not less than 50% of the highest transfer frequency.

Optionally, the recommended welding wire extension length may include optimal values, maximum values, and minimum values that match the welding energy parameters.

For example, the welding energy parameter is the welding current, and the welding current is 70A. At a certain preset wire feeding speed, the optimal value of the recommended welding wire extension length matching the welding current is 10mm, the maximum value is 12mm, and the minimum value is 10mm. The value is 7mm. By indicating the optimal value, maximum value and minimum value of the recommended welding wire extension length, the user can easily determine the optimal value within the range of the welding wire extension length, so as to set the welding wire extension length according to the actual application.

In this embodiment, the correlation between the welding energy parameter and the recommended welding wire extension length is obtained in advance. For example, the correlation between welding energy parameters and recommended wire extension length can be determined through welding process performance testing.

Among them, the relationship between the welding energy parameters and the recommended welding wire extension length can be stored through an array. For example, the association is stored in an array in the read-only memory ROM or FLASH used by the embedded controller (MCU or DSP, etc.) of the welding machine system.

In this embodiment, the recommended welding wire extension length corresponding to the welding energy parameter is determined and indicated based on the received welding energy parameter and the preset association relationship. This may mean that when the user selects or inputs the welding energy parameter, the welding machine system Automatically find the recommended welding wire extension length from the array and display it visually (or in other ways such as voice) for user reference.

Optionally, the above array includes the median value, upper limit value and lower limit value of the welding current at different welding working points, as well as the recommended welding wire extension length corresponding to the above median value, the above upper limit value and the above lower limit value respectively. . Among them, the wire feeding speeds of different welding working points are different.

For example, when welding is stable, the intersection point between the wire feeding speed and the welding current and/or voltage is the welding working point. Therefore, when the wire feeding speed is fixed, multiple welding working points can be obtained by changing the welding current. In this embodiment, the array used to save the above association is a two-dimensional array. The two-dimensional array contains multiple one-dimensional arrays. Each one-dimensional array corresponds to a wire feeding speed, and each one-dimensional array contains the corresponding The median, upper and lower limits of the welding current of the wire feed speed, and the recommended wire extension lengths corresponding to the above-mentioned median, the above-mentioned upper and above-mentioned lower limits respectively.

It can be seen from the arc characteristics that when the welding current becomes smaller, the arc length becomes smaller. At this time, the welding arc becomes shorter, that is, AL becomes smaller, and the heat generated by the welding current decreases; therefore, in order to ensure that the melting speed during welding remains unchanged (i.e., the (the wire speed remains unchanged), the dry extension WE needs to be increased. At this time, the extension length of the welding wire becomes larger, and the welding wire has a larger resistance heat. This larger resistance heat can be used to ensure that the melting speed is the same as before (before the welding current is reduced). ) remain consistent to ensure welding quality. Therefore, when the welding current is small, the stability of the welding quality can be ensured by increasing the extension length of the welding wire. Correspondingly, when the welding current increases, the extension length of the welding wire should be reduced.

Therefore, in this embodiment, when the welding energy parameter is the welding current, the welding current is negatively correlated with the recommended welding wire extension length to ensure the stability of the welding quality. Optionally, the welding voltage is also inversely related to the recommended wire extension.

S20. Determine the target welding wire extension length based on the recommended welding wire extension length.

In this embodiment, the target welding wire extension length may be the recommended welding wire extension length, or may be a length determined by the user based on the recommended welding wire extension length.

For example, determining the target welding wire extension length according to the recommended welding wire extension length may include the following steps:

Step 1. Receive control instructions input by the user.

Among them, the control instruction can be a confirmation instruction, a cancellation instruction or an input instruction.

Step 2: When the control command is the first command, determine the recommended welding wire extension length as the target welding wire extension length.

In this step, the first instruction refers to the confirmation instruction in step 1, which means that the user accepts the system's recommendation and can directly determine the recommended welding wire extension length as the target welding wire extension length.

In this step, if the recommended welding wire extension length includes the optimal value, the maximum value, and the minimum value matching the welding energy parameter, then the optimal value is determined as the target welding wire extension length.

Step 3: When the control command is the second command, receive the length parameter input by the user, and determine the length parameter as the target welding wire extension length.

Among them, the length parameter refers to the welding wire extension length parameter.

In this step, the second instruction refers to the input instruction in step 1. At this time, the welding wire extension length control device displays a user input window for receiving the length parameter input by the user and determining the length parameter as the target welding wire extension length.

Optionally, the control command may also be a cancel command. If the control command is a cancel command, it means that the welding wire extension length presetting process is canceled and the welding energy parameters can be re-entered or selected.

S30. Generate a position instruction according to the target welding wire extension length, and control the moving position of the welding wire according to the position instruction so that the distance CTWD between the contact tip and the workpiece matches the target welding wire extension length WE.

In this embodiment, the welding machine system controls the moving position of the welding wire according to the position instruction, which may include sending the position instruction to the wire feeding unit, so that the wire feeding unit performs PID control of the moving position of the welding wire according to the position instruction.

In this embodiment, the wire feeding unit can be an independent control unit, such as a wire feeder, or a wire feeding module in a welding machine system.

To further understand this method, please also refer to Figure 3. Figure 3 is a block diagram of a PID closed-loop control system for the extension length of the welding wire provided by an embodiment of the present application.

Illustratively, in this embodiment, the wire feeding unit is a wire feeder. As shown in Figure 3, the closed-loop control system of the welding wire extension position consists of an inner speed loop and an outer position loop.

In the forward channel, the reference input of the position outer loop is the position command, which is used to describe the position reference of CTWD. The difference output of the position outer loop is used as the speed inner loop after passing through its position PID regulator and displacement speed converter. The speed reference input, and the speed difference of the speed inner loop is used to control the speed of the wire feeder and indirectly control the position of the wire feed motor shaft after passing through its speed PID regulator.

In the backward channel, the feedback parameter of the position outer loop can be the integral of the feedback speed, or the pulse signal sequence of the quadrature encoder of the wire feed motor; the feedback parameter of the speed inner loop can be the feedback parameter on the wire feeder that reflects the speed. Pulse signal sequence for the quadrature encoder of the wire feed motor.

Among them, the welding wire extension position can be calculated by the following formula (2).

L =ωR t = 2π× f × R × t(2)

Among them, L is the extension position of the welding wire, ω is the angular velocity of the wire feed motor, R is the radius of the wire feeder, f is the frequency, and t is the time.

The wire feeding unit performs PID control of the moving position of the welding wire according to the position command, realizing the automatic setting of the CTWD preset position and ensuring the accuracy of the CTWD position.

The welding wire extension length control method provided by the embodiment of this application determines the recommended welding wire extension length according to the welding energy parameters selected by the user, and determines the target welding wire extension length based on the recommended welding wire extension length, that is, the preset position of the CTWD is determined; This method does not need to rely on users to select CTWD, reduces the skill requirements for welding workers, and ensures the stability of welding quality; and using the recommended and tested CTWD can better ensure the stability of the welding process. and the welding seam forming quality, improving the welding quality; optionally, in this method, the automatic preset of CTWD is realized through automatic control of the welding wire extension position, eliminating the need for manual measurement and length position adjustment, ensuring the length position accuracy. And improve efficiency.

It should be understood that the sequence number of each step in the above embodiment does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any influence on the implementation process of the embodiment of the present application. limited.

Based on the welding wire extension length control method provided in the above embodiments, embodiments of the present invention further provide device embodiments for implementing the above method embodiments.

Figure 4 is a schematic structural diagram of a welding wire extension length control device provided by an embodiment of the present application. Each unit is included for executing each step in the embodiment corresponding to Figure 2. For details, please refer to the relevant description in the embodiment corresponding to Figure 2. For convenience of explanation, only parts related to this embodiment are shown. Referring to Figure 4, the welding wire extension length control device 40 includes:

Instruction module 401 is used to determine and indicate the recommended welding wire extension length corresponding to the welding energy parameters according to the received welding energy parameters and the preset correlation before starting welding, where the welding wire extension length is used to describe The distance between the contact tip and the workpiece, the preset correlation includes the correlation between the welding energy parameter and the recommended welding wire extension length.

Determining module 402 is used to determine the target welding wire extension length according to the recommended welding wire extension length.

The control module 403 is used to generate a position instruction according to the target welding wire extension length, and control the moving position of the welding wire according to the position instruction so that the distance between the contact tip and the workpiece matches the target welding wire extension length. .

Optionally, the indication includes: one or more of visual indication, auditory indication and tactile indication.

Optionally, the welding energy parameter includes welding current, and the welding current and the recommended welding wire extension length are negatively correlated in the correlation relationship.

Optionally, the association is stored in arrays, and different arrays correspond to different wire feeding speeds; where each array contains the median, upper limit, and lower limit of the welding current, as well as the median, all The upper limit value and the lower limit value respectively correspond to the recommended welding wire extension length.

Optionally, the welding energy parameters include: one or more of welding current, welding voltage, workpiece thickness, welding power, and welding impedance.

Optionally, the determination module 402 determines the target welding wire extension length according to the recommended welding wire extension length, specifically including:

Receive control instructions input by the user;

When the control instruction is a first instruction, determine the recommended welding wire extension length as the target welding wire extension length;

Optionally, the control module 403 is used to control the moving position of the welding wire according to the position instruction, specifically including:

The welding wire extension length control device provided in the embodiment of the present application determines the recommended welding wire extension length according to the welding energy parameters selected by the user, and determines the target welding wire extension length according to the recommended welding wire extension length, that is, the preset position of the CTWD is determined; This method does not need to rely on users to select CTWD, reduces the skill requirements for welding workers, and ensures the stability of welding quality; and using the recommended and tested CTWD can better ensure the stability of the welding process. and welding seam forming quality, improving welding quality; optionally, in this method, automatic preset of CTWD is realized through automatic control of the welding wire extension length, eliminating the need for manual measurement and length position adjustment, ensuring length position accuracy. And improve efficiency.

The welding wire extension length control device provided by the embodiment shown in Figure 4 can be used to implement the technical solution in the above method embodiment. Its implementation principles and technical effects are similar, and will not be described again in this embodiment.

Figure 5 is a schematic diagram of a welding wire extension length control device provided by an embodiment of the present application. As shown in Figure 5, the welding wire extension length control device 50 of this embodiment includes: at least one processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. The length control device 50 also includes a communication component 503, wherein the processor 501, the memory 502 and the communication component 503 are connected by a bus 504.

When the processor 501 executes the computer program, the steps in the embodiment of the welding wire extension length control method in Figure 2 are implemented. For example, the computer program may be divided into one or more modules/units, which are stored in the memory 502 and executed by the processor 501 to complete the present application.

Those skilled in the art can understand that Figure 5 is only an example of the welding wire extension length control device and does not constitute a limitation on the welding wire extension length control device. It may include more or fewer components than shown in the figure, or some combinations of certain components. Components, or different components, such as input and output devices, network access devices, buses, etc.

Embodiments of the present application also provide a computer-readable storage medium that stores a computer program. When executed by a processor, the computer program can implement the steps in the above-mentioned welding parameter setting method embodiment.

An embodiment of the present application also provides a welding machine system. Figure 6 is a schematic diagram of a welding machine system provided by an embodiment of the present application. As shown in Figure 6, the welding machine system includes a human-computer interaction unit 601, a welding machine control unit 602, a database 603, a welding gun switch 604 and a wire feeding unit 605.

Among them, the human-computer interaction unit 601 is used to indicate the recommended welding wire extension length, and receive welding energy parameters and control instructions input by the user.

Alternatively, commonly used welding energy parameters can be stored in the database 603 in advance and displayed through the human-computer interaction unit 601 for user selection.

The welding machine control unit 602 is used to execute the embodiments of the above method, which will not be described again here. The correlation between the parameters used to describe the welding energy and the recommended welding wire extension length is stored in the database 603 in the form of an array. In response to the user's input, the welding control unit 602 uses interpolation calculation (linear or nonlinear), table lookup, or other mathematical intelligent methods based on the database to obtain the recommended welding wire extension length corresponding to the welding energy parameter. And displayed through the human-computer interaction unit 601.

In this embodiment, the wire feeding unit 605 is an independent control unit, such as a wire feeder.

For example, the welding machine control unit 602 generates a position instruction according to the extension length of the welding wire, and sends the position instruction to the wire feeding unit 605. The wire feeding unit performs PID control of the moving position of the welding wire according to the position instruction received by the position 605, so as to Ensure that CTWD realizes automatic preset of length position.

After completing the CTWD length position presetting, the user can send a control signal to the welding machine control unit 602 through the welding gun switch 604 to start welding.

In the above embodiments, each embodiment is described with its own emphasis. For parts that are not detailed or documented in a certain embodiment, please refer to the relevant descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.

In the embodiments provided in this application, it should be understood that the disclosed apparatus/network equipment and methods can be implemented in other ways. For example, the apparatus/network equipment embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components. can be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, which may be in electrical, mechanical or other forms.

A unit described as a separate component may or may not be physically separate. A component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The above embodiments are only used to illustrate the technical solutions of the present application, but are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments. Modifications are made to the recorded technical solutions, or equivalent substitutions are made to some of the technical features; these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and shall be included in this application. within the scope of protection.

Claims

A method for controlling the extension length of welding wire, characterized in that the method includes:

Before starting welding, according to the received welding energy parameters and the preset association, the recommended welding wire extension length corresponding to the welding energy parameters is determined and indicated, where the welding wire extension length is used to describe the relationship between the contact tip and the workpiece distance, and the preset correlation includes a correlation between the welding energy parameter and the recommended welding wire extension length;

Determine the target welding wire extension length according to the recommended welding wire extension length;

A position instruction is generated according to the target welding wire extension length, and the moving position of the welding wire is controlled according to the position instruction so that the distance between the contact tip and the workpiece matches the target welding wire extension length.
The welding wire extension length control method according to claim 1, wherein the indication includes: one or more of a visual indication, an auditory indication and a tactile indication.
The welding wire extension length control method as claimed in claim 1, wherein the welding energy parameters include welding current;

In the correlation relationship, the welding current and the recommended welding wire extension length are negatively correlated.
The method for controlling the extension length of the welding wire as claimed in claim 3, wherein the association relationship is stored in an array, and different arrays correspond to different wire feeding speeds;

Each array contains the median value, the upper limit value and the lower limit value of the welding current, as well as the recommended welding wire extension length corresponding to the median value, the upper limit value and the lower limit value respectively.
The method for controlling the welding wire extension length according to claim 1, wherein the target welding wire extension length is determined according to the recommended welding wire extension length, including:

Receive control instructions input by the user;

In the case where the control instruction is a first instruction, the recommended welding wire extension length is determined as the target welding wire extension length;

When the control instruction is the second instruction, the length parameter input by the user is received, and the length parameter is determined as the target welding wire extension length.
The method for controlling the extension length of the welding wire according to claim 1, wherein the step of controlling the moving position of the welding wire according to the position instruction includes:

The position instruction is sent to the wire feeding unit, so that the wire feeding unit performs PID control of the moving position of the welding wire according to the position instruction.
The welding wire extension length control method according to any one of claims 1 to 6, characterized in that the welding energy parameters include: one or more of welding current, welding voltage, workpiece thickness, welding power, and welding impedance.
A welding wire extension length control device, characterized in that the control device includes:

An indication module, used to determine and indicate the recommended welding wire extension length corresponding to the welding energy parameters and the received welding energy parameters and the preset correlation before starting welding, where the welding wire extension length is used to describe the conductive The distance between the nozzle and the workpiece, the preset correlation includes the correlation between the welding energy parameter and the recommended welding wire extension length;

a determination module for determining the target welding wire extension length according to the recommended welding wire extension length;

A control module configured to generate a position instruction according to the target welding wire extension length, and to control the moving position of the welding wire according to the position instruction so that the distance between the contact tip and the workpiece matches the target welding wire extension length.
A welding wire extension length control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that when the processor executes the computer program, The steps of the method according to any one of claims 1 to 7.
A computer-readable storage medium storing a computer program, characterized in that when the computer program is executed by a processor, the steps of the method described in any one of claims 1 to 7 are implemented.