CN115770928A - Arc length control method - Google Patents

Abstract

An arc length control method comprising: acquiring a first time length representing the arc length; determining an energy deviation value according to a time deviation value between the first time length and a set time length; and determining a pulse parameter correction amount for a next pulse based on the energy deviation value. The method comprises the steps of obtaining a first time length representing the arc length, obtaining an energy correction value by utilizing the deviation value of the first time length and a preset time length, and adjusting the pulse parameter of the next pulse based on the energy correction value, so that the purpose of controlling pulse energy output is achieved, and finally the arc length of the pulse is kept consistent.

Description

Arc length control method

technical field

Embodiments of the present disclosure relate to the field of welding, and in particular, relate to a method for controlling arc length.

Background technique

In the pulse welding process, in order to achieve better forming and weld quality, it is usually necessary to weld at a shorter arc length, that is, a slight short circuit needs to occur during the welding process. The usual welding control method is based on the voltage to control the arc length, that is, the arc length is characterized by voltage, but when the form of the welding joint changes (such as fillet joint, butt joint, etc.), or the ratio of shielding gas changes, the same voltage In this case, the arc length may actually be different.

Contents of the invention

In view of the above problems, the embodiments of the present disclosure provide an arc length control method, by monitoring the short circuit occurrence time and comparing it with the time setting value, and then controlling the output energy, so that the arc length is stable and consistent, and it is not affected by the joint form. and gas ratio and other external factors.

At least one embodiment of the present disclosure provides an arc length control method, including:

Obtain the first time length representing the arc length;

determining an energy deviation value according to a time deviation value between the first time length and a set time length; and

Based on the energy deviation value, the pulse parameter correction amount of the next pulse is determined.

In an embodiment of the present disclosure, the first time length includes the time length from the start moment of the current pulse to the moment when the short circuit occurs.

In an embodiment of the present disclosure, obtaining the first time length representing the arc length includes:

Obtain the time length between the pulse start moment and the short circuit occurrence moment of multiple pulses including the current pulse;

determining an average length of time between the start of the pulse and the time the short circuit occurs for a plurality of pulses including the current pulse; and

The average time length is used as the first time length.

In an embodiment of the present disclosure, the first time length includes the sum of the time length from the start moment of the current pulse to the moment when the short circuit occurs and the time advance of the moment when the short circuit occurs reflected by the short circuit time length of the current pulse.

In an embodiment of the present disclosure, obtaining the first time length representing the arc length includes:

Obtaining the time length between the pulse starting moment of the multiple pulses including the current pulse and the short-circuit occurrence time and the sum of the time advance of the short-circuit occurrence moment reflected by the short-circuit time length of the multiple pulses including the current pulse;

determining an average length of time based on the sum; and

The average time length is used as the first time length.

In an embodiment of the present disclosure, determining the energy deviation value according to the time deviation value between the first time length and the set time length includes:

Based on the deviation value between the first time length and the set time length, the energy deviation value is determined by using PID control or fuzzy control.

In an embodiment of the present disclosure, based on the energy deviation value, determining the pulse parameter correction amount of the next pulse includes:

△Ip=a1*P1+b1;

△Tp=a2*P1+b2;

ΔIb=a3*P1+b3; and

△T=a4*P1+b4;

Among them, △Ip represents the correction amount of pulse peak current, △Tp represents the correction amount of pulse peak time, △Ib represents the correction amount of pulse base value current, △T represents the correction amount of pulse period, P1 represents the energy correction amount, a1, b1, a2, b2, a3, b3, a4, and b4 represent coefficients.

At least one embodiment of the present disclosure provides a non-volatile storage medium on which is stored a computer program executable by a processor, and in response to the execution of the computer program by the processor, the processor is configured to implement any of the above-mentioned Operations in the arc length control method.

At least one embodiment of the present disclosure is a computer program product, the computer program product includes a processor-executable program computer program, and when the computer program is executed by the processor, the processor is configured to implement any of the above arcs. Operations in long control methods.

According to the arc length control method of the embodiment of the present disclosure, by obtaining the first time length representing the arc length, using the deviation between the first time length and the preset time length to obtain an energy correction value, and based on the energy correction amount Adjust the pulse parameters of the next pulse, so as to achieve the purpose of controlling the pulse energy output, and finally keep the arc length of the pulse consistent. At the same time, the first time length can be the time length between the pulse start moment of the current cycle and the short circuit occurrence time to simplify the calculation, or the time length between the pulse start time of multiple pulses including the current pulse and the short circuit occurrence time can be used. The average time length can effectively avoid the influence of abnormal short circuit of the current pulse (that is, early or late short circuit) on determining the parameters of the next pulse. In addition, the time advance of the moment of short-circuit occurrence reflected by the short-circuit time is also introduced to further optimize the characterization of the arc length, which can better control the pulse energy and keep the arc length of the pulse consistent.

Description of drawings

Fig. 1 shows the process of pulse welding;

FIG. 2 shows a flowchart of an arc length control method according to an embodiment of the present disclosure;

FIG. 3 shows a flow chart of obtaining a first time length in an arc length control method according to an embodiment of the present disclosure; and

Fig. 4 shows a flow chart of obtaining a first time length in an arc length control method according to yet another embodiment of the present disclosure.

Detailed ways

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

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

In pulse welding, the voltage is usually used to characterize the arc length, but when the welding joint form changes (such as fillet joint, butt joint, etc.), or the ratio of shielding gas changes, the actual arc length may be different under the same voltage .

In the pulse welding process, in order to achieve better forming and weld quality, it is usually necessary to weld at a shorter arc length, that is, a slight short circuit needs to be generated during the welding process. Figure 1 shows the relationship between the droplet formation during welding and the moment when a short circuit occurs. Typically, a droplet forms at the end of the pulse peak and is then elongated by the arc force to transition to the workpiece. When the droplet comes into contact with the workpiece, a short circuit occurs. The longer the arc length, the later the short circuit occurs, and the shorter the arc length, the earlier the short circuit occurs. Therefore, the arc length can be represented by the short circuit occurrence time.

Based on this, the embodiments of the present disclosure provide an arc length control method, which uses real-time monitoring of the moment when the short circuit occurs to control the output energy to achieve a stable and consistent welding arc length, and is not affected by external factors such as joint form and gas ratio. Impact.

At least one embodiment of the present disclosure provides an arc length control method. As shown in FIG. 2 , the arc length control method includes:

S01, acquiring a first time length representing an arc length;

S02. Determine an energy deviation value according to a time deviation value between the first time length and a set time length; and

S03. Acquire a pulse parameter correction amount of a next pulse based on the energy deviation value.

In an embodiment of the present disclosure, the first time length includes the time length from the start moment of the current pulse to the moment when the short circuit occurs.

In an embodiment of the present disclosure, in order to prevent the abnormality of the short circuit occurrence time in the current pulse period, that is, the short circuit occurrence is advanced or the short circuit occurrence is delayed, the pulse start time of multiple consecutive pulses including the current pulse to the short circuit time can be used The average value of the time length between occurrence moments is used as the first time length, and the energy correction value is obtained based on the difference between the average value and the set time length.

In an embodiment of the present disclosure, as shown in FIG. 3 , obtaining the first time length representing the arc length includes:

S011, acquiring the time length between the pulse start moment and the short circuit occurrence moment of multiple pulses including the current pulse;

S012, determine the average time length between the pulse start moment and the short circuit occurrence moment of multiple pulses including the current pulse; and

S013. Use the average time length as the first time length T1.

After using the average time length as the first time length T1, determine and use the average time length between the pulse start moment of multiple pulses and the short circuit occurrence time as the pulse of the current pulse based on the first time length T1 The first length of time between the initial moment and the short-circuit occurrence time can effectively avoid the influence of the abnormal short-circuit occurrence of the current pulse (that is, the early or late occurrence of the short-circuit) on determining the parameters of the next pulse. Usually, the time length between the pulse start moment and the short circuit occurrence time of 10 pulses can be selected as an average, and the obtained average time length can be used as the first time length.

In some cases, it is also necessary to analyze and calculate the energy correction amount in conjunction with the analysis of the length of the short-circuit time. If the short-circuit time length is greater than the standard short-circuit time length corresponding to the welding current, it means that the short-circuit occurrence time is advanced, and if the short-circuit time length is smaller than the standard short-circuit time length corresponding to the welding current, it means that the short-circuit occurrence time is delayed.

In an embodiment of the present disclosure, the first time length includes the sum of the time length from the start moment of the current pulse to the moment when the short circuit occurs and the time advance of the moment when the short circuit occurs reflected by the short circuit time length of the current pulse.

If the short-circuit time length T2 of the current pulse is equal to the standard short-circuit time length Ts corresponding to the welding current, it means that the time advance of the short-circuit occurrence moment reflected by the short-circuit time length is zero, and the first time length is the current pulse starting moment to The time length of the short-circuit occurrence moment; if the short-circuit time length T2 of the current pulse is greater than the standard short-circuit time length T _standard corresponding to the welding current, it means that the time advance of the short-circuit occurrence moment reflected by the short-circuit time length is K*(T2-T _standard ), the first time length is the difference between the time length from the current pulse starting moment to the short circuit occurrence time and the time advance K* (T2-T _standard ); if the short circuit time length T2 of the current pulse is less than the corresponding welding current The standard short-circuit time length T _standard means that the time delay at the moment of short-circuit occurrence reflected by the short-circuit time length is K*(T _standard -T2), and the first time length is the time length from the start moment of the current pulse to the moment of short-circuit occurrence and the difference between the time delay amount K*( _Tstandard -T2), where K represents the coefficient.

In an embodiment of the present disclosure, in order to prevent the abnormality of the moment when the short circuit occurs and the abnormality of the short circuit time length in the current pulse cycle, as shown in FIG. 4, obtaining the first time length representing the arc length includes:

S021, acquiring the time length between the pulse starting moment of the multiple pulses including the current pulse and the short-circuit occurrence time and the short-circuit time length of the multiple pulses including the current pulse The sum of the time advance of the short-circuit occurrence moment reflected;

S022, based on the sum, determine an average time length; and

S023. Use the average time length as the first time length T1.

In one embodiment of the present disclosure, the energy correction value P1 is determined through PID control or fuzzy control based on the deviation value between the first time length T1 and the set time length.

Based on the deviation value between the first time length T1 and the set time length, the PID control is used to obtain the energy correction value, which can quickly respond to the error, reduce the steady state error, completely eliminate the system error, and make the system error zero, thereby eliminating the steady state error. State error, reduce overshoot, overcome oscillation, improve system stability, and speed up system dynamic response speed. Reduce adjustment time, thereby improving system dynamics. Based on the deviation value between the first time length and the set time length, using fuzzy control to obtain the energy correction value can reduce the complexity of system design, and has better robustness, adaptability and better fault tolerance.

After the energy correction value is obtained, the pulse parameter correction amount of the next pulse can be adjusted. The pulse parameter correction includes the pulse peak current correction △Ip, the pulse peak time correction △Tp, the pulse base current correction △Ib, and the pulse period correction △T.

In one embodiment of the present disclosure,

△Ip=a1*P1+b1;

△Tp=a2*P1+b2;

ΔIb=a3*P1+b3; and

△T=a4*P1+b4;

Among them, △Ip represents the correction amount of pulse peak current, △Tp represents the correction amount of pulse peak time, △Ib represents the correction amount of pulse base current, △T represents the correction amount of pulse period, and P1 represents the energy correction amount. a1, b1, a2, b2, a3, b3, a4, b4 are related to welding materials, and the values can be obtained according to the test data.

The calculated correction amount will be reflected in the next pulse, so as to achieve the purpose of controlling the pulse energy output, and finally keep the arc length of the pulse consistent.

According to the arc length control method of the embodiment of the present disclosure, by obtaining the first time length representing the arc length, using the deviation between the first time length and the preset time length to obtain an energy correction value, and based on the energy correction amount Adjust the pulse parameters of the next pulse, so as to achieve the purpose of controlling the pulse energy output, and finally keep the arc length of the pulse consistent. At the same time, the first time length can be the time length between the pulse start moment of the current cycle and the short circuit occurrence time to simplify the calculation, or the time length between the pulse start time of multiple pulses including the current pulse and the short circuit occurrence time can be used. The average time length can effectively avoid the influence of abnormal short circuit of the current pulse (that is, early or late short circuit) on determining the parameters of the next pulse. In addition, the time advance of the moment of short-circuit occurrence reflected by the short-circuit time is also introduced to further optimize the characterization of the arc length, which can better control the pulse energy and keep the arc length of the pulse consistent.

In the description of the present disclosure, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "back", "left", "right" and the like indicate directions or positions The relationship is an orientation or positional relationship based on the working state of the present disclosure, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the present disclosure.

In the description of the present disclosure, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present disclosure in specific situations.

The present disclosure has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve as illustrations only. On this basis, various replacements and improvements can be made to the present disclosure, all of which fall within the protection scope of the present disclosure.

Claims (9)

1. A method for arc length control, comprising: Obtain the first time length representing the arc length; determining an energy deviation value according to a time deviation value between the first time length and a set time length; and Based on the energy deviation value, the pulse parameter correction amount of the next pulse is determined. 2. The arc length control method according to claim 1, wherein the first time length includes the time length from the start moment of the current pulse to the moment when the short circuit occurs. 3. The arc length control method according to claim 1, wherein obtaining the first time length representing the arc length comprises: Obtain the time length between the pulse start moment and the short circuit occurrence moment of multiple pulses including the current pulse; determining an average length of time between the start of the pulse and the time the short circuit occurs for a plurality of pulses including the current pulse; and The average time length is used as the first time length. 4. The arc length control method according to claim 1, wherein the first time length includes the time length from the start moment of the current pulse to the moment when the short circuit occurs and the short circuit time length of the current pulse reflects the difference between the moment when the short circuit occurs The sum of the time advances. 5. The arc length control method according to claim 1, wherein obtaining the first time length representing the arc length comprises: Acquiring the sum of the time length between the pulse start moment of the multiple pulses including the current pulse and the short-circuit occurrence time and the short-circuit time length of the multiple pulses including the current pulse, and the time advance of the short-circuit occurrence moment reflected; determining an average length of time based on the sum; and The average time length is used as the first time length. 6. The arc length control method according to any one of claims 1 to 5, wherein, according to the time deviation value between the first time length and the set time length, determining the energy deviation value comprises: Based on the deviation value between the first time length and the set time length, the energy deviation value is determined by using PID control or fuzzy control. 7. The arc length control method according to any one of claims 1 to 5, wherein, based on the energy deviation value, determining the pulse parameter correction amount of the next pulse comprises: △Ip=a1*P1+b1; △Tp=a2*P1+b2; ΔIb=a3*P1+b3; and △T=a4*P1+b4; Among them, △Ip represents the correction amount of pulse peak current, △Tp represents the correction amount of pulse peak time, △Ib represents the correction amount of pulse base value current, △T represents the correction amount of pulse period, P1 represents the energy correction amount, a1, b1, a2, b2, a3, b3, a4, and b4 represent coefficients. 8. A non-volatile storage medium on which a computer program executable by a processor is stored, and in response to the execution of the computer program by the processor, the processor is configured to implement any one of claims 1 to 7 operations in the arc length control method described above. 9. A computer program product comprising a processor-executable program computer program which, when said computer program is executed by a processor, said processor is configured to implement any one of claims 1 to 7 Operations in the arc length control method.

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