CN115255564A - DC welding control method and device - Google Patents

Abstract

The invention provides a direct current welding control method and device. The method includes: determining a target arc characteristic adjustment direction according to welding conditions; adjusting the direction based on the target arc characteristic, adjusting the arc energy in the short-circuit stage and the arc-burning stage to perform welding. The arc characteristics are controlled according to the welding conditions, so as to adjust the arc state, and then change the weldability to meet different welding conditions and improve the welding quality.

Description

DC welding control method and device

technical field

The invention relates to the field of welding technology, in particular to a DC welding control method and device.

Background technique

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 the common welding methods have also changed from the previous flame brazing, electrode arc welding, etc. to gas metal shielded welding, laser welding and other welding technologies. At present, MIGA welding has been quite popular, and the welding performance is constantly improving. As the most common gas shielded welding method, DC MIG welding has the following advantages: ①high efficiency and fast welding speed; ②large penetration depth and small welding deformation; ③can realize welding in various positions and has strong flexibility;④ Open arc operation, easy to observe the molten pool and arc.

During the DC welding process of MIGA welding, due to the differences in various working conditions, it is difficult for a single constant DC arc to meet all welding conditions, resulting in poor welding quality.

Contents of the invention

The object of the present invention is to provide a DC welding control method and device capable of improving welding quality.

To achieve the above object, the present invention provides a DC welding control method, which includes:

According to the welding conditions, determine the adjustment direction of the target arc characteristics;

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.

The present invention also provides a DC welding control device for improving welding quality, which includes:

The arc characteristic determination module is used to determine the adjustment direction of the target arc characteristic according to the welding working condition;

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.

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

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

The present invention also provides a computer program product, the computer program product includes a computer program, and when the computer program is executed by a processor, the above DC welding control method is realized.

In the embodiment of the present invention, the target arc characteristic adjustment direction is determined according to the welding working condition; based on the target arc characteristic adjustment direction, the arc energy in the short-circuit stage and the arc-burning stage is adjusted to perform welding. The arc characteristics are controlled according to the welding working conditions, so as to adjust the arc state, and then change the weldability to meet different welding working conditions and improve the welding quality.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in:

Fig. 1 is a schematic diagram of the realization process of the DC welding control method of the embodiment of the present invention;

Fig. 2 is a schematic diagram of the implementation process of step 102 in a specific embodiment of the present invention;

Fig. 3 is a schematic diagram of the DC welding current waveform when the arc characteristic of a specific example of the present invention is 0;

Fig. 4 is a schematic diagram of the DC welding current waveform when the arc characteristics of the specific example of the present invention are adjusted in the forward direction;

Fig. 5 is a schematic diagram of the shape of the molten pool corresponding to Fig. 4;

Fig. 6 is a schematic diagram of the DC welding current waveform during the negative adjustment of the arc characteristics of the specific example of the present invention;

Fig. 7 is a schematic diagram of the shape of the molten pool corresponding to Fig. 6;

Fig. 8 is a schematic diagram of the DC welding control process of a specific embodiment of the present invention;

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

Fig. 10 is a schematic structural diagram of a computer device in an embodiment of the present invention.

Detailed ways

The present application will be further described in detail through the accompanying drawings and embodiments below. Through these descriptions, the features and advantages of the present application will become clearer and more specific.

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 superior or better than other embodiments. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features involved in different embodiments of the present application described below may be combined with each other as long as they do not constitute a conflict with each other.

The inventors found that in the DC welding process of MIGA welding, due to the differences in various working conditions, it is difficult for a single constant DC arc to meet all welding conditions, so it is necessary to obtain different arc characteristics by improving the DC welding arc characteristics. DC arc. 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 hard; decreasing the first and second rising slopes will make the DC arc soft. However, this adjustment method of arc characteristics only creates an illusion of softening and hardening of the arc to the welder's senses, but 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 changes in the matching relationship between arc energy and wire feeding speed, resulting in unstable arc, and even serious wire collapse and arc breaking, which will affect the welding effect.

In order to solve the above problems, the embodiment of the present invention provides a DC welding control method to improve the welding quality, the method is shown in Figure 1, including:

Step 101: According to the welding working conditions, determine the adjustment direction of the target arc characteristics;

Step 102: 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.

It can be seen from the above process that in the embodiment of the present invention, the target arc characteristic adjustment direction is determined according to the welding working conditions; based on the target arc characteristic adjustment direction, the arc energy in the short-circuit stage and the arc-burning stage is adjusted to perform welding. The arc characteristics are controlled according to the welding working conditions, so as to adjust the arc state, and then change the weldability to meet different welding working conditions and improve the welding quality.

First, according to the welding conditions, determine the adjustment direction of the target arc characteristics, which specifically includes: according to the type of welding plate, determine the adjustment direction of the target arc characteristics as no adjustment, positive adjustment or negative adjustment. In specific implementation, for example, when welding medium and thick plates, in order to increase the penetration depth of the weld and improve the mechanical properties of the weld, the adjustment direction of the target arc characteristics is determined to be positive adjustment; If it is a general welding condition and there is no special welding requirement, then determine the adjustment direction of the target arc characteristics as no adjustment. Those skilled in the art can understand that the determination of the adjustment direction of the target arc characteristics according to the welding conditions is not limited to the type of the welded plate, but can also be determined according to many conditions such as welding speed requirements and weld shape requirements during actual operation. It is not absolute to determine the adjustment direction of the target arc characteristics, and it is determined according to the type of welding plate. As long as it is welding thick plates, the arc characteristics must be adjusted positively; when welding thin plates, it must be adjusted negatively, which needs to be adjusted according to the actual welding. The working condition adjustment is just an example and is not intended to limit the protection scope of the present invention.

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

After the target arc characteristic adjustment direction is determined, the direction is adjusted based on the target arc characteristic, and the arc energy in the short circuit stage and the arc burning stage is adjusted to perform welding. During specific implementation, the direction is adjusted based on the target arc characteristics, and the arc energy in the short-circuit stage and arc-burning stage is adjusted, as shown in Figure 2, including:

Step 201: If the target arc characteristic adjustment direction is positive adjustment, reduce the arc energy in the short circuit stage and increase the arc energy in the arc burning stage;

Step 202: If the target arc characteristic adjustment direction is negative adjustment, increase the arc energy in the short circuit stage and decrease the arc energy in the arc burning stage.

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, 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 duration of the arc-burning current in the arc-burning stage.

As shown in Fig. 3 to Fig. 7, Fig. 3 is a welding current waveform diagram when the arc characteristic is not adjusted (the arc characteristic is 0), wherein, the first rising slope of the welding current in the short-circuit stage is S2, and the welding current in the short-circuit stage has a The second rising slope is L2, the inflection point of the rising current is A2, the arcing current I2 in the arcing stage, and the duration of the arcing current is T2. At this time, the arc energy is moderate, and the arc hardness is moderate.

As shown in Figure 4, when the arc characteristics are adjusted positively, 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 The arc energy in the short circuit stage is reduced; the inflection point of the rising current is still A2, the arc current in the arc stage is increased from I2 to I1, and the arc current duration is still T2, which is equivalent to increasing the arc energy in the arc stage. At this point the arc energy increases and the arc hardens. Because in DC welding, the arc energy in the arcing stage determines the penetration depth of the weld seam. At this time, the arc energy in the arcing stage increases, and it is easy to form a finger-shaped penetration, which is more conducive to the increase in penetration. At the same time, the short-circuit frequency becomes higher and the arc changes The shape of the molten pool is shown in Figure 5. Such a molten pool has a large penetration depth, which is more conducive to the welding of medium and thick plates, and can be penetrated at one time.

As shown in Figure 6, when the arc characteristics are negatively adjusted, 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. In fact, It is to increase the arc energy in the short circuit stage; the inflection point of the rising current is still A2, the arc current in the arc stage is still I2, and the arc current duration is reduced from T2 to T3, which is equivalent to reducing the arc energy in the arc 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 penetration depth is shallow, and the short-circuit frequency becomes low, and the arc becomes soft. The appearance of the molten pool is shown in Figure 7. For fast welding of thin plates, it can ensure that the weldments are not welded through.

Those skilled in the art can understand that the adjustment amount of the first rising slope, the second rising slope, the arc current and the 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 welding conditions such as different welding consumables and different shielding gases change, the adjustment amount is different, but the adjustment trend will not change. For example, as long as it is satisfied: when the arc characteristics are adjusted positively, the first rising slope and the second rising slope increase, and the arc current increases; when the arc characteristics are negatively adjusted, the first rising slope and the second rising slope decrease, and the arc current continues Time reduction all belong to the protection scope of the present invention.

During the adjustment process of the arc characteristics, the welding voltage basically does not change, the short-circuit transition is uniform, and the arc is stable, that is, the arc can guarantee a stable state under different arc characteristics.

To sum up, through the DC welding control method provided by the embodiment of the present invention, the arc can achieve the following effects:

Adjusting the arc characteristics can obviously change the state of the arc, and then change the weldability (or change the penetration depth and width, or change the anti-interference ability of the arc);

No matter how the arc characteristics are adjusted, it can ensure a stable arc state during the welding process and ensure a good welding process.

The DC welding control process provided by a specific embodiment of the present invention is shown in Figure 8. After the welding starts, the welding machine is turned on, and the arc characteristic adjustment is selected according to the welding working conditions. slope and the second rising slope, and increase the arc current; if the negative adjustment is made, reduce the first rising slope and the second rising slope in the short-circuit stage, and reduce the duration of the arc current; after the adjustment, welding, until the welding is completed.

From the above adjustment process, it can be seen that through the adjustment of the arc characteristics, the arc state during DC welding is significantly improved, the arc is stable during the welding process, the short-circuit transition is uniform, the weld shape is good, and the adaptability to complex welding conditions is improved. By changing the characteristics of the arc, different DC welding arcs are obtained, and the adaptability of the welding arc is improved.

Based on the same inventive concept, the embodiment of the present invention also provides a DC welding control device. The principle of the problem to be solved is similar to the above DC welding control method, and the repetition will not be repeated. The specific structure is shown in Figure 9, including:

The arc characteristic determining module 901 is used to determine the adjustment direction of the target arc characteristic according to the welding working condition;

The arc characteristic adjustment module 902 is configured 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.

During specific implementation, the arc characteristic determination module 901 is specifically configured to: determine the adjustment direction of the target arc characteristic as no adjustment, positive adjustment or negative adjustment according to the type of the welding plate.

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

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

The embodiment of the present invention also provides a computer device. FIG. 10 is a schematic diagram of the computer device in the embodiment of the present invention. The computer device can implement all the steps in the DC welding control method in the above embodiment. The computer device specifically includes the following contents:

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

Wherein, the processor 1001, memory 1002, and communication interface 1003 complete mutual communication through the communication bus 1004; the communication interface 1003 is used to realize information transmission between related devices;

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-mentioned embodiments when executing the computer program.

An embodiment of the present invention also provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the above DC welding control method is implemented.

The embodiment of the present invention also provides a computer program product, the computer program product includes a computer program, and when the computer program is executed by a processor, the above DC welding control method is implemented.

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

By determining the adjustment direction of the target arc characteristics according to the welding conditions; adjusting the direction based on the target arc characteristics, adjusting the arc energy in the short circuit stage and the arc burning stage, and performing welding. The arc characteristics are controlled according to the welding working conditions, so as to adjust the arc state, and then change the weldability to meet different welding working conditions and improve the welding quality.

Although the present invention provides the operational steps of the method described in the embodiments or flowcharts, more or fewer operational steps may be included based on routine or non-inventive efforts. The sequence of steps enumerated in the embodiments is only one of the execution sequences of many steps, and does not represent the only execution sequence. When executed by an actual device or client product, the methods shown in the embodiments or drawings may be executed sequentially or in parallel (for example, in a parallel processor or multi-thread processing environment).

Those skilled in the art should understand that the embodiments of this specification may be provided as methods, devices (systems) or computer program products. Accordingly, the embodiments of the present description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment 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 for relevant parts, refer to part of the description of the method embodiment. In this document, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without necessarily requiring or implying any such relationship between these entities or operations. Actual relationship or sequence.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can 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 permutation of these aspects and/or embodiments. Furthermore, each aspect and/or embodiment of the invention may be used alone or in combination with one or more other aspects and/or embodiments thereof.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. All of them should be covered by the scope of the claims and description of the present invention.

Claims (10)

1. A direct current welding control method is characterized by comprising the following steps:

determining a target arc characteristic adjusting direction according to a welding condition;

and adjusting the direction based on the target arc characteristics, adjusting the arc energy in the short circuit stage and the arc burning stage, and welding.

2. The direct current welding control method of claim 1, wherein determining a target arc characteristic adjustment direction based on the welding conditions comprises:

and determining the target arc characteristic adjustment direction to be non-adjustment, positive adjustment or negative adjustment according to the type of the welded plate.

3. The dc welding control method of claim 2, wherein adjusting the arc energy in the short circuit phase and the arc burning phase based on the target arc characteristic adjustment direction comprises:

and if the target arc characteristic adjustment direction is positive adjustment, reducing the arc energy in the short circuit stage and increasing the arc energy in the arcing stage.

4. The dc welding control method of claim 3, wherein reducing arc energy during a short circuit phase and increasing arc energy during an arcing phase comprises:

and increasing the first rising slope and the second rising slope of the welding current in the short-circuit stage, and increasing the arcing current in the arcing stage.

5. The dc welding control method of claim 2, wherein the target arc characteristic adjustment direction, the adjustment of arc energy in a short circuit phase and an arc burning phase, comprises:

and if the target arc characteristic adjustment direction is negative adjustment, increasing the arc energy in the short circuit stage and reducing the arc energy in the arcing stage.

6. The direct current welding control method of claim 5, wherein increasing the arc energy in the short circuit phase and decreasing the arc energy in the arcing phase comprises:

and reducing the first rising slope and the second rising slope of the welding current in the short-circuit stage, and reducing the duration of the arcing current in the arcing stage.

7. A direct current welding control device, comprising:

the arc characteristic determination module is used for determining the target arc characteristic adjustment direction according to the welding working condition;

and the arc characteristic adjusting module is used for adjusting the arc energy in the short circuit stage and the arc burning stage based on the target arc characteristic adjusting direction to carry out welding.

8. A computer device, characterized in that the computer device comprises: a processor adapted to implement instructions and a memory device storing instructions adapted to be loaded by the processor and to perform the dc welding control method of any of claims 1 to 6.

9. A computer-readable storage medium storing a computer program for executing the dc welding control method according to any one of claims 1 to 6.

10. A computer program product, characterized in that the computer program product comprises a computer program which, when being executed by a processor, carries out the direct current welding control method of one of the claims 1 to 6.

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