Arc energy dynamic matching method and device in welding specification change stage and storage medium

Abstract

The invention discloses an electric arc energy dynamic matching method and device in a welding specification change stage and a storage medium, and belongs to the technical field of welding. The method comprises the steps that the function relation between dynamic energy output by an electric arc in the welding specification change stage and a welding specification is obtained, the dynamic energy is the energy difference between the arc output energy when the specification changes in the same control period and the arc output energy when the specification is not changed; according to the function relation, dynamic energy needing to be output by the electric arc when the welding specification changes in the current control period is obtained; energy required to be output by the electric arc under the current control period when the specification is not changed is obtained as static energy; according to the static energy and the dynamic energy, the total energy needing to be output by the electric arc when the welding specification changes in the current control period is obtained; and welding parameters are adjusted according to the total energy required to be output by the electric arc, so that the electric arc state during standard change is stabilized, and the welding quality is improved.

Description

Technical Field

[0001] The present invention belongs to the field of welding technology, and in particular relates to a method, a device and a storage medium for dynamically matching arc energy in a welding specification change stage. Background Art

[0002] In some welding applications, the two pulse welding specifications need to be changed periodically to achieve the expected welding effect. However, in the process of changing the two pulse specifications, due to the change in arc shape, more short circuits often occur, resulting in fine lines on the weld, poor aesthetics, large spatter and other problems.

[0003] When the welding specification remains unchanged (static), there is a matching relationship between the wire feeding speed and the output energy. However, when the welding specification changes (dynamic), the matching between the output energy and the wire feeding speed is different from that in the static state. At this time, if the energy obtained by static unified matching is still used to set the welding parameters when the welding specification changes, it will lead to inappropriate output arc length, which will lead to unsightly welding effect and low welding quality.

[0004] Therefore, it is urgent to introduce a dynamic matching relationship between the arc output energy and the changes in welding specifications to solve this problem when the welding specifications change. Summary of the invention

[0005] The present invention provides a method, device and storage medium for dynamic matching of arc energy in a welding specification change stage. By splitting the arc output energy in a welding specification change stage into static energy and dynamic energy, and summarizing the relationship between the dynamic energy and the specification change, the arc output energy in the welding specification change stage can be inferred, so that the welding machine system can automatically match the appropriate energy, thereby stabilizing the arc state when the specification changes and improving the welding quality.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a method for dynamically matching arc energy in a welding specification change stage, comprising: Obtaining a functional relationship between the dynamic energy of the arc output and the welding specification during the welding specification change stage, wherein the dynamic energy is: the energy difference between the arc output energy when the specification changes and the arc output energy when the specification remains unchanged under the same control cycle; According to the functional relationship, the dynamic energy required to be output by the arc when the welding specification changes in the current control cycle is obtained; Obtaining the static energy required to be output by the arc in the current control cycle, wherein the static energy is the output energy of the arc when the specification remains unchanged within the control cycle; According to the static energy and the dynamic energy, the total energy required to be output by the arc when the welding specification changes in the current control cycle is obtained; The welding parameters are adjusted according to the total energy required to be output by the arc.

[0007] Optionally, the step of obtaining the functional relationship between the dynamic energy output by the arc and the welding specification during the welding specification change phase includes: Obtain historical welding data through multiple welding experiments; According to the historical welding data, the relationship between dynamic energy, the rate of change of welding specifications and the target specification value is obtained, ΔP=f(dS / dt, S), wherein S is the target specification value, dS is the specification change value, dt is the time of the control cycle, dS / dt is the specification change speed, and ΔP is the dynamic energy.

[0008] Optionally, the step of obtaining the dynamic energy required to be output by the arc when the welding specification changes in the current control cycle according to the functional relationship includes: Get the target specification value under the current control cycle; According to the target standard value and the time of the current control cycle, it is determined whether the standard change speed in the current control cycle is 0. If the standard change speed is 0, the dynamic energy is 0. If the standard change speed is not 0, the target standard value and the standard change speed are substituted into the relationship to obtain the dynamic energy that the arc should output in the current control cycle.

[0009] Optionally, the obtaining of the static energy required to be output by the arc in the current control cycle includes: obtaining a recommended output energy value of the welding specification when the welding specification remains unchanged in the current control cycle.

[0010] Optionally, the total energy required to be output by the arc when the welding specification changes in the current control cycle is obtained based on the static energy and the dynamic energy, including: adding the static energy and the weighted dynamic energy to obtain the final energy to be output in the current control cycle P=ΔP*k+Ps, wherein P is the final energy to be output, k is the gain coefficient, and Ps is the static energy.

[0011] Optionally, adjusting the welding parameters according to the total energy required to be output by the arc includes: adjusting one or more welding parameters that affect the arc output energy in the current control cycle according to the calculated final energy P value to be output, so that the final total energy output by the arc is consistent with the P value, wherein the welding parameters include pulse period and peak current.

[0012] In a second aspect, the present invention provides an arc energy dynamic matching device in a welding specification change stage, comprising: Dynamic energy relationship acquisition module: used to obtain the functional relationship between the dynamic energy of the arc output and the welding specification during the welding specification change stage, wherein the dynamic energy is: the energy difference between the arc output energy when the specification changes and the arc output energy when the specification remains unchanged under the same control cycle; Dynamic energy acquisition module: used for acquiring the dynamic energy required to be output by the arc when the welding specification changes in the current control cycle according to the functional relationship; Static energy acquisition module: used to obtain the static energy required to be output by the arc in the current control cycle, wherein the static energy is the output energy of the arc when the specification remains unchanged within the control cycle; Output total energy acquisition module: used to acquire the total energy required to be output by the arc when the welding specification changes in the current control cycle according to the static energy and the dynamic energy; Feedback adjustment module: used to adjust welding parameters according to the total energy required to be output by the arc.

[0013] In a third aspect, the present invention provides a computer storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for dynamically matching arc energy in the welding specification change stage as described in any step of the first aspect is implemented.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention splits the total arc output energy in the welding specification change stage into constant energy and changing energy, superimposes a dynamic energy on the static energy, uses the dynamic energy to characterize the output energy difference between the specification change and the specification unchanged case, and then summarizes the relationship between the dynamic energy and the specification change, thereby calculating the total energy required to be output by the arc in the specification change stage, and reversely adjusts the relevant parameters output by the welding machine during the welding process according to the calculated total energy, so that the arc output energy dynamically adapts to the specification change, thereby achieving improved welding quality and beautiful welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a flow chart of a method for dynamically matching arc energy during a welding specification change phase in an embodiment of the present invention;

[0016] Figure 2 The figure shows a schematic diagram of energy superposition comparison in the standard change stage in an embodiment of the present invention;

[0017] Figure 3 The figure shows the relationship between the pulse period and the output energy in one embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] Example 1

[0020] like Figure 1 As shown, this embodiment provides a method for dynamically matching arc energy in a welding specification change stage, comprising:

[0021] Obtaining a functional relationship between the dynamic energy of the arc output and the welding specification during the welding specification change stage, wherein the dynamic energy is: the energy difference between the arc output energy when the specification changes and the arc output energy when the specification remains unchanged under the same control cycle;

[0022] According to the functional relationship, the dynamic energy required to be output by the arc when the welding specification changes in the current control cycle is obtained;

[0023] Obtaining the static energy required to be output by the arc in the current control cycle, wherein the static energy is the output energy of the arc when the specification remains unchanged within the control cycle;

[0024] According to the static energy and the dynamic energy, the total energy required to be output by the arc when the welding specification changes in the current control cycle is obtained;

[0025] The welding parameters are adjusted according to the total energy required to be output by the arc.

[0026] The welding machine will periodically calculate the arc output energy value P during the welding process, and the period is dt. When the specification remains unchanged, the arc output energy matches the specification value, and the output energy is the static energy. The arc is in a stable state. When the arc changes, the arc output energy will increase, and the arc output energy does not match the specification value. In this embodiment, the arc output energy is divided into static energy and dynamic energy, and the dynamic energy is used to characterize the output energy difference when the specification changes compared to the specification remains unchanged, so as to find the law between the arc output energy and the specification value when the specification changes, so as to adjust the welding parameters in advance to control the arc output energy, so that it adapts to the changes in the welding specification, thereby improving the welding quality.

[0027] Example 2

[0028] Based on Example 1, this example also makes the following design.

[0029] The calculation of the total energy that the arc should output during the specification change phase is specifically divided into the following steps.

[0030] Firstly, through a large number of welding experiments, the relationship data between dynamic energy, specification change rate and target specification value were obtained, and the relationship curve was fitted: ΔP=f(dS / dt, S), where S is the target specification value, ddS / dt is the specification change rate, and ΔP is the output energy adjustment value, that is, dynamic energy.

[0031] When it is known in advance that the specifications will change, the target specification value S in the current control cycle is calculated, and the specification change rate dS / dt is determined to be 0 based on the target specification value S and the time t of the current control cycle. If the specification change rate dS / dt is 0, the dynamic energy ΔP is 0, that is, only static energy but no dynamic energy exists in the current control cycle. If the specification change rate ΔP is not 0, the target specification value S and the specification change rate dS / dt are substituted into the relationship ΔP=f(dS / dt,S) to obtain the dynamic energy ΔP that the arc should output in the current control cycle.

[0032] According to the dynamic energy and static energy, the final output energy is P=ΔP*k+Ps, where P is the final output energy, k is the gain coefficient, and Ps is the static energy. The recommended total output energy under the specification is calculated based on the unchanged welding specification. This recommended total output energy is the static energy of the arc output under the specification.

[0033] The energy mentioned above can be any parameter that can change the arc output energy, such as pulse period, peak current, etc. Figure 3 As shown, taking the pulse period as an example, T=T(S)+ΔP*k, where k is the gain coefficient and T(S) is the recommended pulse period value of the current specification. When the output energy T increases, the pulse period becomes shorter, and when the output energy T decreases, the pulse period becomes longer.

[0034] according to Figure 2 Taking the energy superposition diagram of the specification change stage shown as an example, the time interval between welding specifications S1 and S2 is dt, and dt is used as a control cycle. When the time reaches the welding specification S2 point, the current specification is S2, and dS / dt=(S2-S1) / dt is calculated once, and the average specification value within this cycle dt is calculated as the target specification value S=(S1+S2) / 2; if dS / dt is not equal to 0, according to the functional relationship, the current energy ΔP=f(dS / dt, S) that needs to be superimposed is calculated. ΔP=f(dS / dt, S) basically follows the following rule: under the condition that the target specification value S is the same, the larger the dS / dt, the larger the ΔP, and the smaller the dS / dt, the smaller the ΔP; under the condition that dS / dt is the same, the larger S is, the larger the ΔP, and the smaller S is, the smaller the ΔP.

[0035] Using the formula T=T(S)+ΔP*k, the cycle time is adjusted by ΔP*k. During the process of specification changes, the welding arc is basically in a stable state and there will be no increase in short circuits.

[0036] Example 3

[0037] The present invention provides an arc energy dynamic matching device in a welding specification change stage, comprising:

[0038] Dynamic energy relationship acquisition module: used to obtain the functional relationship between the dynamic energy of the arc output and the welding specification during the welding specification change stage, wherein the dynamic energy is: the energy difference between the arc output energy when the specification changes and the arc output energy when the specification remains unchanged under the same control cycle;

[0039] Dynamic energy acquisition module: used for acquiring the dynamic energy required to be output by the arc when the welding specification changes in the current control cycle according to the functional relationship;

[0040] Static energy acquisition module: used to obtain the static energy required to be output by the arc in the current control cycle, wherein the static energy is the output energy of the arc when the specification remains unchanged within the control cycle;

[0041] Output total energy acquisition module: used to acquire the total energy required to be output by the arc when the welding specification changes in the current control cycle according to the static energy and the dynamic energy;

[0042] Feedback adjustment module: used to adjust welding parameters according to the total energy required to be output by the arc.

[0043] Example 4

[0044] This embodiment provides a computer storage medium on which a computer program is stored. When the computer program is executed by a processor, the method for dynamically matching arc energy in the welding specification change stage as described in any step of Example 2 is implemented.

[0045] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0046] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0047] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0048] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0049] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A method for dynamically matching arc energy during a welding specification change phase, characterized in that: include: Obtaining a functional relationship between the dynamic energy of the arc output and the welding specification during the welding specification change stage, wherein the dynamic energy is: the energy difference between the arc output energy when the specification changes and the arc output energy when the specification remains unchanged under the same control cycle; According to the functional relationship, the dynamic energy required to be output by the arc when the welding specification changes in the current control cycle is obtained; Obtaining the static energy required to be output by the arc in the current control cycle, wherein the static energy is the output energy of the arc when the specification remains unchanged within the control cycle; According to the static energy and the dynamic energy, the total energy required to be output by the arc when the welding specification changes in the current control cycle is obtained; The welding parameters are adjusted according to the total energy required to be output by the arc.

2. The arc energy dynamic matching method in the welding specification change stage according to claim 1 is characterized in that: The method of obtaining the functional relationship between the dynamic energy output by the arc and the welding specification during the welding specification change stage includes: Obtain historical welding data through multiple welding experiments; According to the historical welding data, the relationship between dynamic energy, the rate of change of welding specifications and the target specification value is obtained, ΔP=f(dS / dt, S), wherein S is the target specification value, dS is the specification change value, dt is the time of the control cycle, dS / dt is the specification change speed, and ΔP is the dynamic energy.

3. The arc energy dynamic matching method in the welding specification change stage according to claim 2 is characterized in that: The step of obtaining the dynamic energy required to be output by the arc when the welding specification changes in the current control cycle according to the functional relationship includes: Get the target specification value under the current control cycle; According to the target standard value and the time of the current control cycle, it is determined whether the standard change speed in the current control cycle is 0. If the standard change speed is 0, the dynamic energy is 0. If the standard change speed is not 0, the target standard value and the standard change speed are substituted into the relationship to obtain the dynamic energy that the arc should output in the current control cycle.

4. The arc energy dynamic matching method in the welding specification change stage according to claim 3 is characterized in that: The obtaining of the static energy required to be output by the arc in the current control cycle includes: obtaining a recommended output energy value of the welding specification when the welding specification remains unchanged in the current control cycle.

5. The arc energy dynamic matching method in the welding specification change stage according to claim 4 is characterized in that: The method of obtaining the total energy required to be output by the arc when the welding specification changes in the current control cycle based on the static energy and the dynamic energy includes: adding the static energy and the weighted dynamic energy to obtain the energy P=ΔP*k+Ps that should be finally output in the current control cycle, wherein P is the energy that should be finally output, k is the gain coefficient, and Ps is the static energy.

6. The arc energy dynamic matching method in the welding specification change stage according to claim 5 is characterized in that: The method of adjusting welding parameters according to the total energy required to be output by the arc includes: adjusting one or more welding parameters that affect the arc output energy in the current control cycle according to the calculated final energy P value to be output, so that the final total energy output by the arc is consistent with the P value, wherein the welding parameters include pulse period and peak current.

7. A device for dynamically matching arc energy during welding specification change phase, characterized in that: include: Dynamic energy relationship acquisition module: used to obtain the functional relationship between the dynamic energy of the arc output and the welding specification during the welding specification change stage, wherein the dynamic energy is: the energy difference between the arc output energy when the specification changes and the arc output energy when the specification remains unchanged under the same control cycle; Dynamic energy acquisition module: used for acquiring the dynamic energy required to be output by the arc when the welding specification changes in the current control cycle according to the functional relationship; Static energy acquisition module: used to obtain the static energy required to be output by the arc in the current control cycle, wherein the static energy is the output energy of the arc when the specification remains unchanged within the control cycle; Output total energy acquisition module: used to acquire the total energy required to be output by the arc when the welding specification changes in the current control cycle according to the static energy and the dynamic energy; Feedback adjustment module: used to adjust welding parameters according to the total energy required to be output by the arc.

8. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for dynamically matching arc energy in a welding specification change stage as described in any one of claims 1 to 6 is implemented.

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