DC welding control method and device

Abstract

The present invention provides a DC welding control method and device, the method comprising: determining the target arc characteristic adjustment direction according to the welding condition; adjusting the arc energy in the short circuit stage and the arc burning stage based on the target arc characteristic adjustment direction, and performing welding. The arc characteristic is controlled according to the welding condition, thereby adjusting the arc state, and then changing the weldability to meet different welding conditions and improve the welding quality.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and in particular to a direct current welding control method and device. Background Art

[0002] With the progress of the times and the improvement of science and technology, welding technology has ushered in rapid development. Nowadays, welding technology has been applied to all walks of life, and common welding methods have also changed from previous flame brazing, arc welding, etc. to welding technologies such as gas metal arc welding and laser welding. At present, gas metal arc welding has become quite popular, and welding performance is constantly improving. As the most common gas shielded welding method, DC gas metal arc welding has the following advantages: ① high efficiency and fast welding speed; ② deep penetration and small welding deformation; ③ various positions can be welded with strong flexibility; ④ open arc operation, which is convenient for observing the molten pool and arc.

[0003] During the DC welding process of gas metal arc welding, due to the differences in various working conditions, a single unchanging DC arc is difficult to meet all welding conditions, resulting in poor welding quality. Summary of the invention

[0004] The object of the present invention is to provide a direct current welding control method and device capable of improving welding quality.

[0005] To achieve the above object, the present invention provides a DC welding control method, which comprises:

[0006] According to the welding conditions, determine the target arc characteristic adjustment direction;

[0007] The direction is adjusted based on the target arc characteristics, and the arc energy in the short circuit stage and the arc burning stage is adjusted to perform welding.

[0008] The present invention also provides a DC welding control device for improving welding quality, comprising:

[0009] An arc characteristic determination module is used to determine the target arc characteristic adjustment direction according to the welding conditions;

[0010] The arc characteristic adjustment module is used to adjust the direction based on the target arc characteristic, adjust the arc energy in the short circuit stage and the arc burning stage, and perform welding.

[0011] The present invention also provides a computer device, a processor suitable for implementing various instructions and a storage device, wherein the storage device stores a plurality of instructions suitable for being loaded by the processor and executing the above-mentioned DC welding control method.

[0012] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is used to execute the above-mentioned DC welding control method.

[0013] The present invention also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the above-mentioned DC welding control method is implemented.

[0014] The embodiment of the present invention determines the target arc characteristic adjustment direction according to the welding conditions; based on the target arc characteristic adjustment direction, adjusts the arc energy in the short circuit stage and the arc burning stage to perform welding. The arc characteristic is controlled according to the welding conditions, thereby adjusting the arc state, and then changing the weldability to meet different welding conditions and improve the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0016] Figure 1 Schematic diagram of the implementation process of the DC welding control method according to an embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of the implementation process of step 102 of a specific embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of a DC welding current waveform when the arc characteristic is 0 according to a specific example of the present invention;

[0019] Figure 4 is a schematic diagram of a DC welding current waveform when the arc characteristic is adjusted in a positive direction according to a specific example of the present invention;

[0020] Figure 5 yes Figure 4 Schematic diagram of the corresponding molten pool shape;

[0021] Figure 6 is a schematic diagram of a DC welding current waveform when the arc characteristic is adjusted negatively according to a specific example of the present invention;

[0022] Figure 7 yes Figure 6 Schematic diagram of the corresponding molten pool shape;

[0023] Figure 8 is a schematic diagram of a DC welding control process according to a specific embodiment of the present invention;

[0024] Fig. 9 is a schematic structural diagram of a DC welding control device according to an embodiment of the present invention;

[0025] Fig.10It is a structural schematic diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0027] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0028] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0029] The inventors have found that in the DC welding process of gas metal arc welding, due to the differences in various working conditions, a single unchanging DC arc is difficult to meet all welding conditions, so it is necessary to obtain different DC arcs by improving the arc characteristics of DC welding. The first rising slope and the second rising slope of the short-circuit waveform can be adjusted: increasing the first rising slope and the second rising slope will make the DC arc harder, and reducing the first and second rising slopes will make the DC arc softer. However, this way of adjusting the arc characteristics only creates an illusion that the arc is softening and hardening in the senses of the welder, and actually does not improve the welding effect much. This adjustment method only adjusts the arc energy in the short-circuit stage, which can easily cause a change in the matching relationship between the arc energy and the wire feeding speed, thereby causing arc instability. In severe cases, wire collapse and arc breaking may even occur, affecting the welding effect.

[0030] To solve the above problems, an embodiment of the present invention provides a DC welding control method for improving welding quality. Figure 1 As shown, including:

[0031] Step 101: determining a target arc characteristic adjustment direction according to welding conditions;

[0032] Step 102: Adjust the direction based on the target arc characteristics, adjust the arc energy in the short-circuit stage and the arcing stage, and perform welding.

[0033] It can be seen from the above process that the embodiment of the present invention determines the target arc characteristic adjustment direction according to the welding conditions; based on the target arc characteristic adjustment direction, adjusts the arc energy in the short circuit stage and the arc burning stage to perform welding. It realizes controlling the arc characteristics according to the welding conditions, thereby adjusting the arc state, and then changing the weldability to meet different welding conditions and improve the welding quality.

[0034] First, according to the welding conditions, the target arc characteristic adjustment direction is determined, specifically including: according to the type of welding plate, the target arc characteristic adjustment direction is determined as no adjustment, positive adjustment or negative adjustment. In specific implementation, for example, if medium and thick plates are welded, in order to increase the weld penetration and improve the mechanical properties of the weld, the target arc characteristic adjustment direction is determined to be positive adjustment; if thin plates are welded quickly, in order to avoid plate burn-through and increase weld spread, the target arc characteristic adjustment direction is determined to be negative adjustment; if it is a general welding condition with no special welding requirements, the target arc characteristic adjustment direction is determined to be no adjustment. Those skilled in the art will appreciate that determining the target arc characteristic adjustment direction based on welding conditions is not limited to the type of welding plate, but can also be determined based on many conditions such as welding speed requirements and weld forming requirements during actual operation. Moreover, when determined based on the type of welding plate, it is not absolute. As long as thick plates are welded, the arc characteristics must be adjusted in a positive direction; when thin plates are welded, they must be adjusted in a negative direction. Adjustment is required based on actual welding conditions. The above is only an example and is not intended to limit the scope of protection of the present invention.

[0035] That is, the idea of ​​determining the target arc characteristic adjustment direction is to change the waveform output of the DC by changing the arc characteristics, and then change the shape and energy distribution of the arc, so as to achieve the purpose of influencing the weld quality so that it can meet different welding requirements.

[0036] After determining the target arc characteristic adjustment direction, the arc energy in the short circuit stage and the arc burning stage is adjusted based on the target arc characteristic adjustment direction to perform welding. In specific implementation, the arc energy in the short circuit stage and the arc burning stage is adjusted based on the target arc characteristic adjustment direction, such as Figure 2 Shown include:

[0037] Step 201: if the target arc characteristic adjustment direction is a positive adjustment, the arc energy in the short circuit stage is reduced, and the arc energy in the arcing stage is increased;

[0038] Step 202: If the target arc characteristic adjustment direction is negative adjustment, the arc energy in the short-circuit stage is increased, and the arc energy in the arcing stage is reduced.

[0039] In a specific embodiment, reducing the arc energy in the short circuit stage and increasing the arc energy in the arc burning stage includes: increasing the first rising slope and the second rising slope of the welding current in the short circuit stage, and increasing the arc burning current in the arc burning stage. Increasing the arc energy in the short circuit stage and reducing the arc energy in the arc burning stage includes: reducing the first rising slope and the second rising slope of the welding current in the short circuit stage, and reducing the arc burning current duration in the arc burning stage.

[0040] like Figures 3 to 7 As shown, Figure 3It is a welding current waveform diagram when the arc characteristics are not adjusted (arc characteristics are 0), wherein the first rising slope of the welding current in the short circuit stage is S2, the second rising slope of the welding current in the short circuit stage is L2, the rising current inflection point is A2, the arcing current in the arcing stage is I2, and the arcing current duration is T2. At this time, the arc energy is moderate and the arc hardness is moderate.

[0041] like Figure 4 As shown in the figure, when the arc characteristics are adjusted in the positive direction, the first rising slope of the welding current in the short circuit stage increases from S2 to S1, and the second rising slope of the welding current in the short circuit stage increases from L2 to L1, which is equivalent to reducing the arc energy in the short circuit stage; the rising current inflection point is still A2, the arc current in the arcing stage increases from I2 to I1, and the arcing current duration is still T2, which is equivalent to increasing the arc energy in the arcing stage. At this time, the arc energy is increased and the arc becomes harder. Because the arc energy in the arcing stage determines the penetration depth of the weld in DC welding, the arc energy in the arcing stage is increased at this time, which is easy to form finger-shaped penetration depth, which is more conducive to increasing the penetration depth. At the same time, the short circuit frequency increases, the arc becomes harder, and the molten pool morphology is as follows: Figure 5 As shown, such a molten pool has a large melting depth, is more conducive to the welding of medium and thick plates, and can be welded through in one go.

[0042] like Figure 6 As shown in the figure, when the arc characteristic is adjusted negatively, the first rising slope of the welding current in the short circuit stage is reduced from S2 to S3, and the second rising slope of the welding current in the short circuit stage is reduced from L2 to L3, which actually increases the arc energy in the short circuit stage; the rising current inflection point is still A2, the arc current in the arcing stage is still I2, and the arcing current duration is reduced from T2 to T3, which is equivalent to reducing the arc energy in the arcing stage. At this time, the arc energy is reduced, and it is easy to form a pot bottom shape during welding. At this time, the melting depth is shallow, and the short circuit frequency becomes lower, the arc becomes softer, and the molten pool morphology is as follows Figure 7 As shown, such a molten pool has a shallow melting depth and is more suitable for fast welding of thin plates, which can ensure that the weldment is not welded through.

[0043] It can be understood by those skilled in the art that the adjustment amount of the first rising slope, the second rising slope, the arcing current and the arcing arc duration of the welding current in the short circuit stage is not limited, and is determined according to the actual welding conditions. For example, when the welding conditions such as different welding materials and different shielding gases change, the adjustment amount is different, but the adjustment trend will not change. For example, as long as it satisfies: when the arc characteristic is adjusted in a positive direction, the first rising slope and the second rising slope increase, and the arcing current increases; when the arc characteristic is adjusted in a negative direction, the first rising slope and the second rising slope decrease, and the arcing current duration decreases, it all falls within the protection scope of the present invention.

[0044] During the arc characteristic adjustment process, the welding voltage basically does not change, the short circuit transition is uniform, and the arc is stable, that is, under different arc characteristics, the arc can maintain a stable state.

[0045] In summary, the DC welding control method provided by the embodiment of the present invention can achieve the following effects on the arc:

[0046] Adjusting the arc characteristics can significantly change the arc state, and thus change the welding properties (or change the depth and width of the weld, or change the arc's anti-interference ability);

[0047] No matter how the arc characteristics are adjusted, a stable arc state can be guaranteed during the welding process, ensuring a good welding process.

[0048] A DC welding control process provided by a specific embodiment of the present invention is as follows: Figure 8 As shown, after welding starts, the welding machine is turned on, and the arc characteristic adjustment is selected according to the welding conditions. If a positive adjustment is performed, the first rising slope and the second rising slope of the short circuit stage are increased, and the arc current is increased; if a negative adjustment is performed, the first rising slope and the second rising slope of the short circuit stage are reduced, and the arc current duration is reduced; after the adjustment is completed, welding is performed until the welding is completed.

[0049] From the above adjustment process, it can be seen that by adjusting the arc characteristics, the arc state during DC welding is significantly improved, making the arc stable, the short circuit transition uniform, the weld formation good, and the adaptability to complex welding conditions improved. By changing the arc characteristics, different DC welding arcs can be obtained, improving the adaptability of the welding arc.

[0050] Based on the same inventive concept, the embodiment of the present invention further provides a DC welding control device, the principle of solving the problem is similar to that of the above-mentioned DC welding control method, and the repeated parts are not repeated. The specific structure is as follows Fig. 9 As shown, including:

[0051] The arc characteristic determination module 901 is used to determine the target arc characteristic adjustment direction according to the welding conditions;

[0052] The arc characteristic adjustment module 902 is used to adjust the direction based on the target arc characteristic, adjust the arc energy in the short circuit stage and the arc burning stage, and perform welding.

[0053] In specific implementation, the arc characteristic determination module 901 is specifically used to: determine the target arc characteristic adjustment direction as no adjustment required, positive adjustment or negative adjustment according to the type of welding plate.

[0054] In a specific embodiment, the arc characteristic adjustment module 902 is specifically used to: if the target arc characteristic adjustment direction is a positive adjustment, reduce the arc energy in the short circuit stage and increase the arc energy in the arc burning stage. In specific implementation, the arc characteristic adjustment module 902 is further specifically used to: increase the first rising slope and the second rising slope of the welding current in the short circuit stage, and increase the arc burning current in the arc burning stage.

[0055] In another specific embodiment, the arc characteristic adjustment module 902 is specifically used to: if the target arc characteristic adjustment direction is negative adjustment, increase the arc energy in the short circuit stage and reduce the arc energy in the arc burning stage. In specific implementation, the arc characteristic adjustment module 902 is further specifically used to: reduce the first rising slope and the second rising slope of the welding current in the short circuit stage, and reduce the arc burning current duration in the arc burning stage.

[0056] An embodiment of the present invention further provides a computer device, Fig.10 Schematic diagram of a computer device in an embodiment of the present invention. The computer device can implement all steps in the DC welding control method in the above embodiment. The computer device specifically includes the following contents:

[0057] Processor (processor) 1001, memory (memory) 1002, communication interface (CommunicationsInterface) 1003 and communication bus 1004;

[0058] The processor 1001, the memory 1002, and the communication interface 1003 communicate with each other through the communication bus 1004; the communication interface 1003 is used to realize information transmission between related devices;

[0059] The processor 1001 is used to call the computer program in the memory 1002, and the processor implements the DC welding control method in the above embodiment when executing the computer program.

[0060] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned DC welding control method is implemented.

[0061] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the above-mentioned DC welding control method is implemented.

[0062] The DC welding control method and device provided in this specific embodiment have the following advantages:

[0063] By determining the target arc characteristic adjustment direction according to the welding conditions, and adjusting the arc energy in the short circuit stage and the arc burning stage based on the target arc characteristic adjustment direction, welding is performed. The arc characteristics are controlled according to the welding conditions, thereby adjusting the arc state, and then changing the weldability to meet different welding conditions and improve the welding quality.

[0064] Although the present invention provides method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the actual device or client product is executed, it can be executed in sequence or in parallel according to the method shown in the embodiments or the drawings (for example, in a parallel processor or multi-threaded processing environment).

[0065] It should be understood by those skilled in the art that the embodiments of this specification may be provided as methods, devices (systems) or computer program products. Therefore, the embodiments of this specification may take the form of complete hardware embodiments, complete software embodiments or embodiments combining software and hardware. Moreover, the present invention may take 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.

[0066] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks 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 produce 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.

[0067] 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.

[0068] 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.

[0069] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0070] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or replacement of these aspects and / or embodiments. Moreover, each aspect and / or embodiment of the present invention may be used alone or in combination with one or more other aspects and / or embodiments thereof.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A DC welding control method, characterized in that: include: According to the welding conditions, determine the target arc characteristic adjustment direction; Adjust the direction based on the target arc characteristics, adjust the arc energy in the short circuit stage and the arc burning stage, and perform welding; The adjusting direction based on the target arc characteristics and adjusting the arc energy in the short circuit stage and the arcing stage include: If the target arc characteristic adjustment direction is negative, the arc energy in the short-circuit stage is increased, and the arc energy in the arcing stage is reduced; The method of increasing the arc energy in the short-circuit stage and reducing the arc energy in the arcing stage includes: The first rising slope and the second rising slope of the welding current in the short-circuit stage are reduced, the short-circuit frequency becomes lower, and the arcing current duration in the arcing stage is reduced.

2. The DC welding control method according to claim 1, characterized in that: According to the welding conditions, determine the target arc characteristic adjustment direction, including: According to the type of welding plate, the target arc characteristic adjustment direction is determined as no adjustment, positive adjustment or negative adjustment.

3. The DC welding control method according to claim 2, characterized in that: Adjusting the direction based on the target arc characteristic and adjusting the arc energy in the short circuit stage and the arcing stage include: If the target arc characteristic adjustment direction is positive adjustment, the arc energy in the short-circuit stage is reduced, and the arc energy in the arcing stage is increased.

4. The DC welding control method according to claim 3, characterized in that: Reduce the arc energy in the short-circuit stage and increase the arc energy in the arcing stage, including: By increasing the first rising slope and the second rising slope of the welding current in the short circuit stage, the short circuit frequency becomes higher and the arcing current in the arcing stage is increased.

5. A DC welding control device, characterized in that: include: An arc characteristic determination module is used to determine the target arc characteristic adjustment direction according to the welding conditions; An arc characteristic adjustment module, used to adjust the direction based on the target arc characteristic, adjust the arc energy in the short circuit stage and the arc burning stage, and perform welding; The arc characteristic adjustment module is used to adjust the arc energy in the short circuit stage and the arcing stage based on the target arc characteristic adjustment direction, including: If the target arc characteristic adjustment direction is negative, the arc energy in the short-circuit stage is increased, and the arc energy in the arcing stage is reduced; The arc characteristic adjustment module is used to increase the arc energy in the short circuit stage and reduce the arc energy in the arcing stage, including: the arc characteristic adjustment module is used to: The first rising slope and the second rising slope of the welding current in the short-circuit stage are reduced, the short-circuit frequency becomes lower, and the arcing current duration in the arcing stage is reduced.

6. A computer device, characterized in that: The computer device comprises: a processor suitable for implementing various instructions and a storage device, wherein the storage device stores a plurality of instructions, and the instructions are suitable for being loaded by the processor and executing the DC welding control method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is used to execute the DC welding control method according to any one of claims 1 to 4.

8. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the DC welding control method according to any one of claims 1 to 4 is implemented.

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