A control method and system for short arc pulse welding

Abstract

The application discloses a kind of short arc pulse welding control method and system, method includes: during welding, the position of molten drop transition short circuit moment in previous pulse period is based on the position of molten drop transition short circuit moment in previous pulse period, and the wire feeding speed of current period is adjusted;Specifically: if the molten drop transition short circuit moment in previous pulse period is in pulse median current or pulse base current period, then the wire feeding speed of current pulse period remains unchanged;If the molten drop transition short circuit moment in previous pulse period is before pulse median current period, then reduce wire feeding speed in current period;If there is no short circuit state in the molten drop transition of previous pulse period, then increase wire feeding speed in current period.The application can make molten drop transition stable present a transition form combining pulse transition and short circuit transition, can reduce welding heat input, in the case where welding speed is very fast still can realize stable welding, improve welding efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulse welding, in particular to a control method and system for short-arc pulse welding. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] With the vigorous development of welding technology in various industries, the gas shielded arc welding process with a consumable electrode has been widely used in various production and manufacturing. However, in the conventional pulse welding process, the arc length is high and the directivity is poor, which is not conducive to high-speed welding. At the same time, due to the high welding heat input, the microstructure and performance of the weld are seriously affected. When the arc length is reduced, a transition form combining pulse transition and short circuit transition can be obtained, which maintains the one-pulse-one-drop welding while having the advantages of strong arc concentration, fast welding speed, low welding heat input, and high forming quality. Therefore, welding practitioners are increasingly inclined to use short-arc pulse welding to improve the stability of the welding process and the welding quality.

[0004] How to ensure the stability of the arc and optimize the heat input is an effective way to improve the welding efficiency. The arc stability and the consistency of the droplet transition are the key factors to ensure the stability of the short-arc pulse welding. Short-arc pulse is a transition form combining pulse transition and short circuit transition of the droplet obtained by reducing the arc height in normal pulse welding, which can effectively reduce the welding heat input and improve the welding efficiency. The traditional short-arc pulse welding mainly obtains the short-arc pulse welding process by continuously adjusting the current, reducing the voltage, and reducing the arc.

[0005] However, through current adjustment, the adjustment process is slow, the output ability and control of the current waveform are high and complex, and in the actual welding process, errors in judgment and adjustment may occur due to the interference of the arc itself, which may cause welding abnormalities. The specific manifestations are as follows: when the arc length is reduced, the droplet short circuit phenomenon is easy to occur, which may easily cause welding spatter and arc instability. If the arc length is further reduced, long-time short circuit, large particle spatter, and even arc instability may occur, which seriously affects the stability of the entire welding process and the quality of the weld formation. This puts high requirements on the implementation of the welding system. SUMMARY

[0006] To solve the above problems, the present application provides a control method and system for short-arc pulse welding. By real-time control and adjustment of the wire feeding speed during the welding process, the droplet transition can be stabilized to a transition form combining pulse transition and short circuit transition, which can reduce the welding heat input, improve the welding efficiency, and achieve the purpose of precise control of the short-arc pulse welding process.

[0007] In some embodiments, the following technical solutions are adopted:

[0008] A control method of short arc pulse welding, comprising:

[0009] During the welding process, the wire feeding speed of the current period is adjusted based on the position of the short circuit time of the droplet transfer in the previous pulse period; specifically:

[0010] If the short circuit time of the droplet transfer in the previous pulse period is in the pulse median current or pulse base current period, the wire feeding speed of the current pulse period remains unchanged;

[0011] If the short circuit time of the droplet transfer in the previous pulse period is before the pulse median current period, the wire feeding speed in the current period is reduced;

[0012] If the droplet transfer in the previous pulse period is short-circuit-free, the wire feeding speed in the current period is increased.

[0013] In other embodiments, the following technical solutions are adopted:

[0014] A control method of short arc pulse welding, comprising:

[0015] During the welding process, the wire feeding speed of the current period is adjusted based on the position of the short circuit time of the droplet transfer in the previous N pulse periods; specifically:

[0016] If the short circuit time of the droplet transfer in no less than N / 2 pulse periods is in the pulse median current or pulse base current period, the wire feeding speed of the current pulse period remains unchanged;

[0017] If the short circuit time of the droplet transfer in no less than N / 2 pulse periods is before the pulse median current period, the wire feeding speed in the current period is reduced;

[0018] If the droplet transfer in no less than N / 2 pulse periods is short-circuit-free, the wire feeding speed in the current period is increased.

[0019] Wherein, N is a set integer value.

[0020] As an optional solution, the wire feeding speed in the current period is reduced, and the reduction amplitude of the wire feeding speed is △V1, which is obtained by system testing.

[0021] Wherein, the △V1 is an integer multiple of 0.1 m / min, and the maximum adjustment amplitude is 1 m / min.

[0022] As an optional solution, the wire feeding speed in the current period is increased, and the increase amplitude of the wire feeding speed is △V2, which is obtained by system testing.

[0023] Wherein, the △V2 is an integer multiple of 0.1 m / min, and the maximum adjustment range is 1 m / min.

[0024] As an optional solution, the pulse peak current, the pulse median current and the pulse base current are preset fixed current values.

[0025] As an optional solution, the short-circuit moment of the droplet transfer in the previous or the previous N pulse periods is obtained by detecting the voltage waveform in the previous or the previous N pulse periods.

[0026] In other embodiments, the following technical solutions are adopted:

[0027] A control system of a short-arc pulse welding comprises:

[0028] The adjustment module is configured to adjust the wire feeding speed in the current period based on the position of the short-circuit moment of the droplet transfer in the previous pulse period during the welding process.

[0029] Specifically, the control system comprises:

[0030] The judgment unit is configured to keep the wire feeding speed in the current pulse period unchanged when the short-circuit moment of the droplet transfer in the previous pulse period is in the pulse median current period or the pulse base current period, to reduce the wire feeding speed in the current period when the short-circuit moment of the droplet transfer in the previous pulse period is before the pulse median current period, and to increase the wire feeding speed in the current period when the droplet transfer in the previous pulse period is in a short-circuit-free state.

[0031] In other embodiments, the following technical solutions are adopted:

[0032] A control system of a short-arc pulse welding comprises:

[0033] The adjustment module is configured to adjust the wire feeding speed in the current period based on the position of the short-circuit moment of the droplet transfer in the previous N pulse periods during the welding process.

[0034] Specifically, the control system comprises:

[0035] The judgment unit is configured to keep the wire feeding speed in the current pulse period unchanged when the short-circuit moment of the droplet transfer in not less than N / 2 pulse periods is in the pulse median current period or the pulse base current period, to reduce the wire feeding speed in the current period when the short-circuit moment of the droplet transfer in not less than N / 2 pulse periods is before the pulse median current period, and to increase the wire feeding speed in the current period when the droplet transfer in not less than N / 2 pulse periods is in a short-circuit-free state; wherein N is a preset integer value.

[0036] Compared with the prior art, the control system of the short-arc pulse welding has the following beneficial effects:

[0037] (1)The present application can present a transition form combining pulse transition and short-circuit transition by real-time control and adjustment of the wire feeding speed in the welding process, can reduce the welding heat input, and can still realize stable welding and improve the welding efficiency in the case of fast welding speed.

[0038] (2)Compared with the adjustment mode by current in the prior art, the present application adjusts by wire feeding speed, has fast adjustment speed, can accurately control the arc state and height in real time, and can stably control the state of the droplet transition, so as to achieve the purpose of precise and controllable short-arc pulse welding process.

[0039] Other features and advantages of the present application and additional aspects will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a short-arc pulse welding system structure schematic diagram in the embodiment of the present application;

[0041] Figure 2 It is a control method flow chart of short-arc pulse welding in the embodiment of the present application;

[0042] Figure 3 It is a wire feeding speed adjustment schematic diagram when the droplet transition short-circuit time is before the pulse median value in the embodiment of the present application;

[0043] Figure 4 It is a schematic diagram of the droplet transition specific time in a complete pulse period in the embodiment of the present application;

[0044] Figure 5 It is a schematic diagram of the droplet transition without short-circuit state in the embodiment of the present application;

[0045] Fig. 6(a)-(c) are respectively welding current and voltage schematic diagrams when the wire feeding speed is 7.5 m / min, 7.0 m / min and 6.5 m / min;

[0046] Figure 7 It is a schematic diagram of the droplet transition in each current stage in a pulse period when the wire feeding speed is 7.0 m / min. DETAILED DESCRIPTION

[0047] It should be noted that the following detailed description is all exemplary, and aims to provide further description of the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0048] It is to be noted that the terms used herein are merely for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0049] Embodiment One

[0050] In one or more embodiments, a control method of short arc pulse welding is disclosed, comprising the following processes:

[0051] During the welding process, the wire feeding speed of the current period is adjusted based on the position of the short circuit moment of the droplet transfer in the previous pulse period; specifically:

[0052] If the short circuit moment of the droplet transfer in the previous pulse period is in the pulse median current or pulse base current period, the wire feeding speed of the current pulse period remains unchanged;

[0053] If the short circuit moment of the droplet transfer in the previous pulse period is before the pulse median current period, the wire feeding speed in the current period is reduced;

[0054] If the droplet transfer in the previous pulse period is short-circuit-free, the wire feeding speed in the current period is increased.

[0055] It should be noted that the short circuit moment of the droplet transfer in the previous pulse period can be obtained by monitoring the voltage waveform in the previous pulse period in real time, mainly detecting the short circuit signal of the droplet short circuit on the voltage waveform for feedback processing.

[0056] As a specific embodiment, in combination with Figure 1 The welding system structure of the embodiment mainly includes a welding power supply, a wire feeding mechanism, and a servo welding gun; wherein the welding power supply is used to convert external alternating current power supply into current and voltage applied in the actual welding process, and at the same time, as a control processing unit, analyzes and processes the instability phenomenon in the welding process, and adjusts in real time to ensure the stability of the welding process; the wire feeding mechanism connects the servo welding gun, provides stable and continuous wire output for the welding process, and ensures that the welding process obtains good weld forming; the servo welding gun is a device internally provided with a high dynamic response servo motor, which can accurately control the change of wire feeding speed, and ensure the consistency and continuity of the wire feeding speed and the stability of the welding process.

[0057] In combination with Figure 2 The control method of short arc pulse welding of the embodiment specifically comprises the following processes:

[0058] S100: Start welding.

[0059] S200: welding according to the preset pulse current I0 and the wire feeding speed V0 of the welding machine.

[0060] S300: detecting the short-circuit time of the droplet transfer in the initial pulse period;

[0061] S400: adjusting the wire feeding speed of the current period based on the position of the short-circuit time of the droplet transfer in the previous pulse period, specifically including:

[0062] S401: determining whether the short-circuit time of the droplet transfer in the previous pulse period is in the pulse median current period or the pulse base current period, if yes, entering S501; otherwise, entering S402 or S403;

[0063] S402: if the short-circuit time of the droplet transfer in the previous pulse period is before the pulse median current period, entering S502;

[0064] S403: if the droplet transfer in the previous pulse period is short-circuit-free, entering S503;

[0065] S501: keeping the wire feeding speed of the current pulse period unchanged;

[0066] S502: reducing the wire feeding speed in the current period, and the reduction amplitude of the wire feeding speed is ΔV1; the specific value of ΔV1 can be obtained through system testing; for example, the initial assignment of ΔV1 is generally 0.1 m / min, and based on the adjustment of the wire feeding speed only, if the requirement of the short-circuit state is still not met after adjusting multiple periods, the value of ΔV1 is continuously increased until a relatively appropriate value of ΔV1 is obtained.

[0067] In the embodiment, ΔV1 is selected as an integer multiple of 0.1 m / min, and the maximum adjustment amplitude (i.e., the maximum value of ΔV1) is 1 m / min.

[0068] In the above process, the pulse peak current, the pulse median current and the pulse base current are all preset fixed current values; at this time, only the wire feeding speed can be adjusted to stabilize the droplet transfer to present a transition form combining pulse transition and short-circuit transition, which can reduce the welding heat input, and still realize stable welding in the case of fast welding speed, thereby improving the welding efficiency. Compared with the adjustment mode by current in the prior art, the adjustment speed of the embodiment is fast, the arc state and height can be accurately controlled in real time, so that the state of the droplet transfer can be stably controlled, and the purpose of accurately controllable short-arc pulse welding process is achieved.

[0069] Figure 3The schematic diagram of wire feeding speed adjustment when the short circuit of the droplet transition is before the pulse median value is given. Before the pulse median current period T2, the droplet will short circuit and transition to the molten pool during the decline of the pulse peak current, at this time the arc length is low, the arc is unstable, the droplet will be abnormal spatter and unstable welding due to short circuit in advance, which seriously reduces the welding quality. Then the wire feeding speed is reduced at the beginning of the next pulse cycle.

[0070] S503: Increase the wire feeding speed in the current cycle, and the increase value of the wire feeding speed is ΔV2; The specific value of ΔV2 can also be obtained by system testing, and the specific testing principle is the same as that of ΔV1, which will not be described in detail.

[0071] In this embodiment, ΔV2 is selected as an integer multiple of 0.1 m / min, and the maximum adjustment amplitude (i.e. the maximum value of ΔV2) is 1 m / min.

[0072] Figure 5 The schematic diagram of the short circuit-free state of the droplet transition is given. In a pulse cycle T4, that is, from the end time t0 of the previous pulse base value to the end time t0 of the current pulse base value, it is a detection cycle, as shown in the T4 stage, there is no phenomenon of short circuit of the droplet transition. At this time, it is reflected that the arc length is high when the droplet transitions, and the short circuit-free state appears. The wire feeding speed will be adjusted in the next pulse cycle, the wire feeding speed is increased by the change amount ΔV, and the short circuit state of the droplet transition in the next cycle is detected again, and real-time adjustment is performed until the stable pulse transition and short circuit transition combination transition form appears, and the short circuit time position of the droplet transition is at the pulse current median value or the base value.

[0073] S600: Enter the wire feeding speed adjustment of the next pulse cycle, and the specific adjustment process is the same as the foregoing, at this time, the next pulse cycle is the current pulse cycle; until the welding is completed.

[0074] As a specific example, Figure 4 A schematic diagram of the specific time of the droplet transition in a complete pulse cycle is given; the following will be described in combination with Figure 3 and Figure 4 The current pulse cycle is described in combination with

[0075] (1) t0 time, that is, the end time of the pulse base value:

[0076] The pulse base value end time, that is, the pulse peak current start time, at which time the welding wire end is slightly melted and forms a droplet by the action of the pulse base current. This time is used as a trigger position signal for adjusting the wire feed amount change. According to the short-circuit state of the droplet transfer in the last pulse period, that is, the short-circuit state of the droplet transfer in the detection period T4 from the last pulse peak start time t0 to the pulse peak start time t0, the adjustment and processing analysis are performed, and the wire feed speed of the current pulse period is adjusted from this time.

[0077] (2) t0-t1 stage, that is, the pulse peak current rising stage:

[0078] In the pulse peak current rising stage, the droplet gradually melts and grows under the combined action of arc force, plasma flow force, and gravity. The wire feed speed in this stage is adjusted according to the adjusted speed value until the pulse base value end time of the current period.

[0079] (3) t1 time, that is, the pulse peak current end time:

[0080] Under the main action of the pulse peak arc force, the droplet grows and has a certain necking phenomenon under the action of the electromagnetic contraction force. The short-circuit state of the droplet is monitored in real time during this period.

[0081] (4) t2 time, that is, the pulse medium value start time:

[0082] During the pulse peak current descending process, the droplet continues to grow and the necking phenomenon becomes more and more obvious. The welding machine monitors the short-circuit state of the droplet in real time. If the short-circuit phenomenon occurs near the pulse peak value or during the process of the pulse peak descending to the medium value current (for example, the short-circuit phenomenon occurs in the T1 time in the above formula), the droplet will transition during the pulse peak current descending process. At this time, the arc length is low, the arc is unstable, the droplet will be abnormally splashed and the welding will be unstable due to the early short-circuit, and the welding quality will be seriously reduced. Therefore, the wire feed speed is reduced in the next pulse period. Figure 3

[0083] (5) t3 time, that is, the pulse medium value end time:

[0084] ​Under the action of the pulse median electromagnetic force, the droplet gravity and the surface tension, the droplet short-circuits at the pulse median, and the pulse median current has a certain duration T2. During this duration, the welding machine monitors the short-circuiting state of the droplet in real time. If the droplet short-circuits and transfers within the duration T2, the droplet will more smoothly transfer to the molten pool, with less spatter and a more stable welding process. If the droplet short-circuits and the short-circuiting time is too long, the short-circuiting current will increase to help the droplet transfer to the molten pool. If there is no short-circuiting phenomenon within the duration, the next pulse cycle is analyzed and processed to determine whether the wire feeding speed needs to be adjusted.

[0085] (6) t4 stage, i.e. pulse base value stage:

[0086] During this stage, the welding machine monitors the short-circuiting state of the droplet in real time. If the droplet short-circuits and transfers, the droplet will more smoothly transfer to the molten pool, with less spatter and a more stable welding process. If the droplet short-circuits and the short-circuiting time is too long, the short-circuiting current will increase to help the droplet transfer to the molten pool. If there is no short-circuiting phenomenon within the duration, the next pulse cycle is analyzed and processed to determine whether the wire feeding speed needs to be adjusted.

[0087] (7) t4-t0 stage, i.e. pulse base value after stage:

[0088] This stage is the end of the current pulse cycle and the beginning of the next pulse cycle. According to the detection time of the droplet transfer short-circuiting time in the current cycle, a relevant determination is made. At the end of the pulse base value, i.e. at the beginning of the pulse peak of the next cycle, the wire feeding speed is adjusted to ensure a stable welding process.

[0089] Fig. 6(a)-(c) respectively show the welding current and voltage diagrams when the wire feeding speed is 7.5 m / min, 7.0 m / min and 6.5 m / min. The upper yellow curve is the voltage signal curve, and the lower green curve is the current signal curve. After the wire feeding adjustment state is turned on, referring to Fig. 6(a), it can be seen from the voltage signal curve that when the wire feeding speed is 7.5 m / min, the short-circuiting position of the droplet is before the pulse median. After the wire feeding speed is reduced to 7.0 m / min, referring to Fig. 6(b), the short-circuiting position of the droplet is delayed and is at the pulse median. Referring to Fig. 6(c), when the wire feeding speed is 6.5 m / min, the voltage signal shows that no short-circuiting phenomenon occurs. Figure 7 Fig. 7 shows the droplet transfer situation in each current stage in the pulse cycle when the wire feeding speed is 7.0 m / min. It can be seen that through the adjustment of the wire feeding speed, the droplet transfer can be realized in a transition form combining pulse transfer and short-circuiting transfer.

[0090] Therefore, the wire feeding speed adjustment method of the embodiment can control the arc state and height in real time and accurately, so that the state of the droplet transfer can be stably controlled, and the purpose of accurately controlling the short-arc pulse welding process is achieved.

[0091] Embodiment Two

[0092] In one or more embodiments, a control method of short-arc pulse welding is disclosed, comprising:

[0093] In the welding process, the wire feeding speed of the current period is adjusted based on the position of the short-circuit time of the droplet transfer in the previous N pulse periods, specifically:

[0094] If the short-circuit time of the droplet transfer in not less than N / 2 pulse periods is in the pulse median current period or the pulse base current period, the wire feeding speed of the current pulse period remains unchanged;

[0095] If the short-circuit time of the droplet transfer in not less than N / 2 pulse periods is before the pulse median current period, the wire feeding speed in the current period is reduced;

[0096] If the short-circuit time of the droplet transfer in not less than N / 2 pulse periods is before the pulse median current period, the wire feeding speed in the current period is reduced;

[0097] Wherein, N is a set integer value.

[0098] In the embodiment, the increase or decrease amplitude of the wire feeding speed is exactly the same as that in Embodiment One.

[0099] In the embodiment, in order to avoid the situation that a single pulse period may cause misjudgment, the short-circuit time of the droplet transfer in the previous N periods is comprehensively judged, and the wire feeding speed of the current period is adjusted based on the short-circuit state of most of the droplet transfers in the previous N periods.

[0100] Similarly, the short-circuit time of the droplet transfer in the previous N pulse periods can be obtained by monitoring the voltage waveform in each pulse period in real time, and the feedback processing is mainly performed by detecting the short-circuit signal of the droplet on the voltage waveform when the droplet occurs short-circuit.

[0101] Embodiment Three

[0102] In one or more embodiments, a control system of short-arc pulse welding is disclosed to implement the control method of short-arc pulse welding in Embodiment One, specifically comprising:

[0103] The adjustment module is configured to adjust the wire feeding speed of the current period based on the position of the short-circuit time of the droplet transfer in the previous pulse period in the welding process;

[0104] Specifically comprising:

[0105] The judging unit is configured to keep the wire feeding speed unchanged in the current pulse period when the droplet transfer short-circuit moment is in the pulse median current or pulse base current period in the previous pulse period, decrease the wire feeding speed in the current period when the droplet transfer short-circuit moment is before the pulse median current period in the previous pulse period, and increase the wire feeding speed in the current period when the droplet transfer is in the non-short-circuit state in the previous pulse period.

[0106] It should be noted that the specific implementation manners of the modules or units are the same as those in Embodiment One.

[0107] Embodiment Four

[0108] In one or more embodiments, a control system of short-arc pulse welding is disclosed to implement the control method of short-arc pulse welding in Embodiment Two, and specifically includes:

[0109] The adjusting module is configured to adjust the wire feeding speed in the current period based on the position of the droplet transfer short-circuit moment in the previous N pulse periods during the welding process.

[0110] Specifically includes:

[0111] The judging unit is configured to keep the wire feeding speed unchanged in the current pulse period when the droplet transfer short-circuit moment is in the pulse median current or pulse base current period in the previous pulse period, decrease the wire feeding speed in the current period when the droplet transfer short-circuit moment is before the pulse median current period in the previous pulse period, and increase the wire feeding speed in the current period when the droplet transfer is in the non-short-circuit state in the previous pulse period.

[0112] It should be noted that the specific implementation manners of the modules or units are the same as those in Embodiment Two.

[0113] The above describes the specific embodiments of the present application in combination with the accompanying drawings, but is not a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A control method of short arc pulse welding, characterized by, The method comprises the following steps: During the welding process, the wire feeding speed of the current cycle is adjusted based on the position of the short circuit time of the droplet transfer in the previous pulse cycle. Specifically: If the short circuit time of the droplet transfer in the previous pulse cycle is in the pulse median current or pulse base current period, the wire feeding speed of the current pulse cycle is kept unchanged; If the short circuit time of the droplet transfer in the previous pulse cycle is before the pulse median current period, the wire feeding speed in the current cycle is reduced; If the droplet transfer in the previous pulse cycle is short-circuit-free, the wire feeding speed in the current cycle is increased.

2. A control method of short arc pulse welding, characterized by, The method comprises the following steps: During the welding process, the wire feeding speed of the current cycle is adjusted based on the position of the short circuit time of the droplet transfer in the previous N pulse cycles. Specifically: If the short circuit time of the droplet transfer in not less than N / 2 pulse cycles is in the pulse median current or pulse base current period, the wire feeding speed of the current pulse cycle is kept unchanged; If the short circuit time of the droplet transfer in not less than N / 2 pulse cycles is before the pulse median current period, the wire feeding speed in the current cycle is reduced; If the droplet transfer in not less than N / 2 pulse cycles is short-circuit-free, the wire feeding speed in the current cycle is increased; 3. A control method of short arc pulse welding according to claim 1 or 2, characterized in that, Wherein, N is a set integer value.

4. A method of controlling a short arc pulse welding as claimed in claim 3, characterized in that, The wire feeding speed in the current cycle is reduced, and the reduction amplitude of the wire feeding speed is △V1, which is obtained through system testing.

5. A method of controlling a short arc pulse welding as claimed in claim 1 or 2, characterized in that, The △V1 is an integer multiple of 0.1 m / min, and the maximum adjustment amplitude is 1 m / min.

6. A method of controlling a short arc pulse welding as claimed in claim 5, characterized in that, The wire feeding speed in the current cycle is increased, and the increase amplitude of the wire feeding speed is △V2, which is obtained through system testing.

7. A method of controlling a short arc pulse welding as claimed in claim 1 or 2, characterized in that, The △V2 is an integer multiple of 0.1 m / min, and the maximum adjustment amplitude is 1 m / min.

8. A method of controlling a short arc pulse welding as claimed in claim 1 or 2, characterized in that, The pulse peak current, pulse median current and pulse base current are preset fixed current values.

9. A control system for short arc pulse welding, characterized in that The short circuit time of the droplet transfer in the previous or previous N pulse cycles is obtained by detecting the voltage waveform in the previous or previous N pulse cycles. The method comprises the following steps: The adjustment module is used to adjust the wire feeding speed of the current cycle based on the position of the short circuit time of the droplet transfer in the previous pulse cycle during the welding process. Specifically:

10. A control system for short arc pulse welding, characterized in that The judgment unit is used to keep the wire feeding speed of the current pulse cycle unchanged when the short circuit time of the droplet transfer in the previous pulse cycle is in the pulse median current or pulse base current period, reduce the wire feeding speed in the current cycle when the short circuit time of the droplet transfer in the previous pulse cycle is before the pulse median current period, and increase the wire feeding speed in the current cycle when the droplet transfer in the previous pulse cycle is short-circuit-free. The method comprises the following steps: The adjustment module is used to adjust the wire feeding speed of the current cycle based on the position of the short circuit time of the droplet transfer in the previous N pulse cycles during the welding process. Specifically: The judging unit is configured to keep the current wire feeding speed unchanged when the short-circuit moment of the droplet transition is in the pulse median current or pulse base current period for not less than N / 2 pulse periods; decrease the wire feeding speed in the current period when the short-circuit moment of the droplet transition is before the pulse median current period for not less than N / 2 pulse periods; and increase the wire feeding speed in the current period when the droplet transition is in a non-short-circuit state for not less than N / 2 pulse periods; wherein N is a set integer value.

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