Short circuit transition waveform control method

Abstract

A short-circuit transition waveform control method includes: determining that a short-circuit welding process enters a long-time arc burning state; obtaining a first voltage when the long-time arc burning state is entered; adjusting a first wire feeding speed in an arc burning stage to a second wire feeding speed according to the first voltage, wherein the second wire feeding speed is greater than the first wire feeding speed; and adjusting the second wire feeding speed in the long-time arc burning state to the first wire feeding speed in the arc burning stage when an arc burning voltage is less than or equal to a second voltage. Embodiments of the present disclosure also provide a non-volatile storage medium and a computer program product. By increasing the wire feeding speed in the long-time arc burning state, the molten droplets can be sent into the molten pool faster, and the generation of excessively large molten droplets, which leads to a large amount of welding spatter, can be avoided.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of welding, in particular, to a short circuiting transfer waveform control method. BACKGROUND

[0002] For gas metal arc welding, the short circuiting welding process in direct current welding can be divided into two most basic processes, namely, a short circuiting stage and an arc striking stage.

[0003] For solid wire, the short circuiting welding process has good droplet transfer consistency, uniform droplet transfer, and little difference in droplet size, and less spatter during welding.

[0004] However, for flux-cored wire, the short circuiting welding process has poor droplet transfer consistency, and the droplet size varies during the droplet transfer process. When the droplet size is small, the welding spatter is small, and when the droplet size is large, the welding spatter is large. The instability of the flux-cored wire droplet transfer also leads to poor consistency of the weld. SUMMARY

[0005] At least one embodiment of the present disclosure provides a short circuiting transfer waveform control method, comprising:

[0006] determining that the short circuiting welding process enters a long-time arc striking state;

[0007] obtaining a first voltage when the long-time arc striking state is entered;

[0008] adjusting a first wire feeding speed in the arc striking stage to a second wire feeding speed according to the first voltage, wherein the second wire feeding speed is greater than the first wire feeding speed; and

[0009] adjusting the second wire feeding speed in the long-time arc striking state to the first wire feeding speed in the arc striking stage when the arc striking voltage is less than or equal to a second voltage.

[0010] In an embodiment of the present disclosure, determining that the short circuiting welding process enters a long-time arc striking state comprises:

[0011] determining that the short circuiting welding process enters a long-time arc striking state when the arc striking stage duration is greater than or equal to a set arc striking time length, and the arc striking current is less than or equal to a first current.

[0012] In an embodiment of the present disclosure, the second wire feeding speed is expressed as V2=k*(U1-U3)+V1, wherein V2 represents the second welding speed, V1 represents the first wire feeding speed, U1 represents the first voltage, U3 represents a short circuiting determination voltage, and the short circuiting welding process enters a short circuiting stage when the arc striking voltage is less than or equal to the short circuiting determination voltage.

[0013] In one embodiment of the present disclosure, the first wire feed speed is adjusted to the second wire feed speed with a first acceleration.

[0014] In one embodiment of the present disclosure, the first acceleration is constant or variable.

[0015] In one embodiment of the present disclosure, the second wire feed speed is adjusted to the first wire feed speed with a second acceleration.

[0016] In one embodiment of the present disclosure, the second acceleration is constant or variable.

[0017] At least one embodiment of the present disclosure also provides a non-volatile storage medium having stored thereon a computer program executable by a processor, in response to the processor executing the computer program, the processor is configured to implement the operations in any of the short circuit transition waveform control methods described above.

[0018] At least one embodiment of the present disclosure also provides a computer program product, the computer program product comprising a processor executable program computer program, when the computer program is executed by a processor, the processor is configured to implement the operations in any of the short circuit transition waveform control methods described above.

[0019] In the short circuit transition waveform control method according to the embodiments of the present disclosure, after it is determined that the short circuit welding process enters the long time arc burning state, the wire feed speed is increased to accelerate the short circuit of the molten droplet into the molten pool, which avoids the long time arc burning state lasting too long, producing too large molten droplets, resulting in a large amount of welding spatter. At the same time, the wire feed speed is adjusted to the normal wire feed speed when the long time arc burning state ends, so that the next cycle can be normally welded. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The short circuit welding waveform when using solid wire in gas shielded arc welding is shown;

[0021] Figure 2 The short circuit welding waveform when using flux-cored wire in gas shielded arc welding is shown;

[0022] Figure 3 A flowchart of the short circuit transition waveform control method according to one embodiment of the present disclosure is shown; and

[0023] Figure 4 A relationship diagram of the wire feed speed and arc voltage in the short circuit transition waveform control method according to one embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0024] The present disclosure will be further described in detail by the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present disclosure will become more apparent.

[0025] The term "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. Unless specifically indicated otherwise, the drawings are not necessarily to scale.

[0026] In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as there is no conflict.

[0027] In the gas shielded arc welding, if a solid wire is used, the droplet transfer consistency in the short circuit welding process is good, the droplet transfer is uniform, the droplet size is not much different, and the spatter amount is small during the welding process. As shown in FIG. 1, the short circuit transfer waveform uniformity is good. If a flux-cored wire is used, the droplet transfer consistency in the short circuit welding process is very poor, the droplet size in the droplet transfer process is different, the spatter amount is small when the droplet size is small, the spatter amount is large when the droplet size is large, and the instability of the flux-cored wire droplet transfer also leads to poor weld consistency. As shown in FIG. 2, the short circuit transfer waveform uniformity is poor. In some short circuit processes, the arc stage time is short, at this time the droplet short-circuits when the size is small, and in some short circuit processes, the arc stage time is long, at this time the droplet size increases with the arc time, leading to large droplet size entering the short circuit stage, large spatter amount, and poor weld consistency. Figure 1 Figure 2

[0028] To this end, at least one embodiment of the present disclosure provides a short circuit transfer waveform control method, which can improve the consistency of droplet transfer in the short circuit welding process of the flux-cored wire, avoid large spatter amount and poor weld consistency caused by long arc time leading to large droplet size, and thus improve the performance of the flux-cored short circuit welding.

[0029] At least one embodiment of the present disclosure provides a short circuit transfer waveform control method, as shown in FIG. 3, which comprises: Figure 3

[0030] S01, determining that the short circuit welding process enters a long-time arc state;

[0031] S02, acquiring a first voltage when the long-time arc state is entered;

[0032] S03, adjusting a first wire feeding speed in the arc stage to a second wire feeding speed according to the first voltage; and

[0033] ​​​S04, when the arc voltage is less than or equal to the second voltage, adjust the second wire feeding speed during the long-term arc state to the first wire feeding speed during the arc stage.

[0034] Figure 4 The relationship between voltage, current, and wire feed speed during short-circuit welding according to an embodiment of this disclosure is illustrated. Figure 4 As shown, under normal circumstances, the short-circuit welding process includes a short-circuit stage and an arc-ignition stage, with the welding machine's wire feed speed maintained at the first wire feed speed V1. When the arc-ignition voltage is less than or equal to the short-circuit determination voltage U3, a short circuit is detected, and the short-circuit welding process enters the short-circuit stage. When the welding voltage is greater than or equal to the arc-ignition determination voltage U4, an arc is detected, and the short-circuit welding process enters the arc-ignition stage. For each set welding current, there is a corresponding arc-ignition time length, which is the duration of the arc-ignition stage. Figure 4 The time t1 shown is the set arc burning time length.

[0035] However, in some welding situations, the electric arc is compressed, and a constant current is output, such as... Figure 4 The diagram shows the stage of the output current I1. Normally, the wire is fed at the first wire feed speed V1. However, because the arc is constantly being output, the welding wire continuously melts under the action of the arc, but the molten droplets cannot contact the base material, causing the droplets to become increasingly larger. This is a very important reason for the large amount of welding spatter.

[0036] In the embodiments of this disclosure, when the short-circuit welding process is detected to have entered a prolonged arcing state, the wire feeding speed is increased to allow the molten droplets to quickly contact the welding base material, thereby ending the prolonged arcing state as soon as possible and entering the short-circuit stage, allowing the welding to return to a normal state.

[0037] In embodiments of this disclosure, the stage of the short-circuit welding process is determined by judging the arc voltage state. For example... Figure 4 As shown, when the welding voltage is less than or equal to the short-circuit judgment voltage U3, the short-circuit welding process is determined to be in the short-circuit stage; when the welding voltage is greater than or equal to the arc judgment voltage U4, the short-circuit welding process is determined to be in the arc stage.

[0038] For short-circuit welding, after the short-circuit stage, the arc-ignition stage begins. For each set welding current, there is a set arc-ignition stage with a set arc-ignition time length t1. After the arc-ignition stage with a set arc-ignition time length t1, the short-circuit welding process transitions to the short-circuit stage.

[0039] However, in actual welding processes, especially when using flux-cored welding wire, a prolonged arcing state may occur. For example... Figure 4In the case of the illustrated start constant output current I1, at which time the arc stage has continued for a set arc time length t1 or more, i.e., the arc stage time is greater than or equal to the set arc time length t1, and the welding current is less than or equal to the first current I1. The first current refers to the minimum current value at which the arc of the welding wire is maintained and the occurrence of an arc break is prevented during the arc.

[0040] In one embodiment of the present disclosure, determining that the short circuit welding process enters the long time arc state includes:

[0041] In the case of the arc stage duration being greater than or equal to the set arc time length, and the arc current being less than or equal to the first current, it is determined that the short circuit welding process enters the long time arc state.

[0042] After determining that the short circuit welding process enters the long time arc state, the first voltage U1 at the time of entering the long time arc state.

[0043] In the case of the arc stage duration being greater than or equal to the set arc time length, and the arc current being less than or equal to the first current, it is determined that the short circuit welding process enters the long time arc state. Figure 4 As shown, the acceleration for adjusting the first wire feed speed V1 during the arc stage to the second wire feed speed V2 is the first acceleration a1. The first acceleration a1 can be obtained according to empirical data. Figure 4 In the above embodiment, the first acceleration a1 is shown as a constant, but the first acceleration a1 can also be variable.

[0044] As the wire feed speed increases, the short circuit of the molten droplet into the molten pool can be accelerated, and the arc voltage also continuously decreases. When the arc voltage is less than or equal to the second voltage U2, it is determined that the long time arc state ends, at which time the wire feed speed is adjusted from the second wire feed speed V2 to the first wire feed speed V1 for wire feeding in the following short circuit stage. The acceleration for adjusting the second wire feed speed V2 to the first wire feed speed V1 is the second acceleration a2, and the second acceleration a2 can be obtained according to empirical data. Figure 4 In the above embodiment, the second acceleration a2 is shown as a constant, but the second acceleration a2 can also be variable.

[0045] After adjusting the wire feed speed to the first wire feed speed V1, the short circuit welding process enters the short circuit stage, and normal wire feeding at the first wire feed speed V1 is started, and the next cycle of the short circuit welding process is continued.

[0046] In the short-circuit transition waveform control method according to the embodiments of the present disclosure, after it is determined that the short-circuit welding process enters the long-time arc burning state, the wire feeding speed is increased to accelerate the short-circuit of the molten drop into the molten pool, so as to avoid that the long-time arc burning state lasts too long, a too large molten drop is generated, and a large amount of welding spatter is caused. At the same time, the wire feeding speed is adjusted to the normal wire feeding speed when the long-time arc burning state ends, so that the next cycle can be normally welded.

[0047] At least one embodiment of the present disclosure also provides a non-volatile storage medium having a processor-executable computer program stored thereon, and the processor is configured to implement the operations in any of the short-circuit transition waveform control methods described above in response to the processor executing the computer program.

[0048] At least one embodiment of the present disclosure also provides a computer program product, which includes a processor-executable program computer program, and the processor is configured to implement the operations in any of the short-circuit transition waveform control methods described above when the computer program is executed by the processor.

[0049] In the description of the present disclosure, it should be explained that the terms “upper”, “lower”, “inner”, “outer”, “front”, “back”, “left”, “right” and the like indicate the orientation or positional relationship in the working state of the present disclosure, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0050] In the description of the present disclosure, it should be explained that, unless otherwise explicitly specified and limited, the terms “mounting”, “connecting”, “connection” should be understood in a broad sense. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0051] The above describes the present disclosure in combination with the preferred embodiments, but these embodiments are only exemplary and are only for illustrative purposes. On this basis, various substitutions and improvements can be made to the present disclosure, and these all fall within the protection scope of the present disclosure.

Claims

1. A short circuit transition waveform control method, comprising: determining that a short circuit welding process enters a long time arc state when an arc duration time is greater than or equal to a set arc time length and an arc current is less than or equal to a first current, wherein the first current is a minimum current value for a flux-cored wire to maintain a stable arc state; acquiring a first voltage when entering the long time arc state; adjusting a first wire feed speed of the arc stage to a second wire feed speed according to the first voltage and a short circuit determination voltage, the second wire feed speed being greater than the first wire feed speed and satisfying: V2=k*(U1-U3)+V1, wherein V1 represents the first wire feed speed, V2 represents the second wire feed speed, U1 represents the first voltage, and U3 represents the short circuit determination voltage; adjusting the second wire feed speed to the first wire feed speed when an arc voltage is less than or equal to a second voltage, the second voltage corresponding to an arc voltage of the flux-cored wire in a critical short circuit state of a droplet and satisfying: U3 < U2, wherein U2 represents the second voltage.

2. The short circuit transition waveform control method of claim 1, wherein, adjusting the first wire feed speed to the second wire feed speed with a first acceleration.

3. The short circuit transition waveform control method of claim 2, wherein, The first acceleration is constant or variable.

4. The short circuit transition waveform control method of claim 1, wherein, adjusting the second wire feed speed to the first wire feed speed with a second acceleration.

5. The short circuit transition waveform control method of claim 4, wherein, The second acceleration is constant or variable.

6. The short circuit transition waveform control method of claim 1 wherein, U2 < U4, and U4 represents an arc determination voltage when the short circuit welding process enters the arc stage. 7.A non-transitory storage medium having stored thereon a processor-executable computer program that, in response to execution by a processor, causes the processor to perform operations of the short circuit transition waveform control method of any one of claims 1 to 6. 8.A computer program product comprising a processor-executable computer program that, in response to execution by a processor, causes the processor to perform operations of the short circuit transition waveform control method of any one of claims 1 to 6.

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